Audio output device

Abstract

The acoustic output device according to the embodiments of the present specification includes a transducer device configured to generate mechanical vibrations based on an electrical signal, the transducer device including a magnetic circuit assembly and a vibration transmission sheet, and a case configured to house the transducer device, the case including a panel and a housing, wherein the magnetic circuit assembly is elastically connected to the case by the vibration transmission sheet, and the transducer device transmits the mechanical vibrations to a user by the panel, and an additional element connected to the magnetic circuit assembly and configured to hold an elastic connection with the panel by the magnetic circuit assembly.

Description

Technical Field

[0001] This application relates to the technical field of acoustics, and particularly to an acoustic output device.

Background Art

[0002] In the design of some acoustic output devices (such as earphones, hearing aids, glasses, helmets, AR / VR devices), in addition to speakers, usually, in order to realize the normal operation of the speaker or enrich the functions of the acoustic output device, it is necessary to install other devices. Speakers generally may include bone conduction speakers and air conduction speakers. A bone conduction speaker can convert an electrical signal into a mechanical vibration signal so as to let the wearer hear voices, and transmit the mechanical vibration signal to the auditory nerve of the human body through human tissues and bones. However, devices added to the bone conduction speaker (such as microphones, sensors, air conduction speakers, batteries, circuit boards, etc.) have a certain mass, which affects the vibration output of the bone conduction speaker and reduces the sensitivity of the bone conduction speaker. In addition, there may be a problem that the additional element and the magnetic circuit assembly in the transducer device attract or repel each other, causing the magnetic circuit assembly to invert and deform.

[0003] Therefore, in order to ensure that the bone conduction speaker has high sensitivity, how to reduce the influence of the mass of the device added to the bone conduction speaker on the vibration output of the bone conduction speaker has become an issue to be solved currently.

Summary of the Invention

[0004] An acoustic output device according to one embodiment of the present application is configured to generate mechanical vibrations based on an electrical signal, and includes a transducer device including a magnetic circuit assembly and a vibration transmission sheet, and a case configured to house the transducer device, the case including a panel and a housing, wherein the magnetic circuit assembly is elastically connected to the case by the vibration transmission sheet, and the transducer device is configured to transmit the mechanical vibrations to a user by the panel, and further includes an additional element connected to the magnetic circuit assembly and configured to maintain elastic connection with the panel by the magnetic circuit assembly.

[0005] The present application will be further described by way of exemplary embodiments, and these exemplary embodiments will be described in detail with reference to the drawings. These embodiments are not limiting, and in these embodiments, the same numbers indicate the same structures.

Brief Description of the Drawings

[0006]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14

Figure 15

Figure 16

Figure 17

Figure 18

Figure 19

Figure 20

Figure 21

Figure 22

Figure 23

Figure 24

Figure 25

Figure 26

Figure 27

Figure 28

Figure 29

Figure 30

Figure 31

Figure 32

Figure 33

Figure 34

Figure 35

Figure 36

Figure 37

Figure 38

Figure 39

Figure 40

Figure 41

Figure 42

Figure 43

Figure 44

Figure 45

Figure 46

Figure 47

Figure 48

Figure 49A

Figure 49B

Figure 49C

Figure 50

Figure 51

Figure 52A

Figure 52B

Figure 53

Figure 54A

Figure 54B

Figure 54C

Figure 54D

Figure 55

Figure 56

Figure 57

Figure 58

Figure 59

Figure 60

Figure 61

Figure 62

Figure 63

Embodiments for Carrying Out the Invention

[0007] To more clearly explain the technical means of the embodiments of the present application, the drawings necessary for the description of the embodiments will be briefly described below. Obviously, the drawings described below are only part of the examples or embodiments of the present application, and those skilled in the art can apply the present application to other similar scenarios based on these drawings without creative effort. Unless otherwise apparent from the context or otherwise stated, the same reference numerals in the drawings represent the same structure or operation.

[0008] Embodiments of this specification describe an acoustic output device. In some embodiments, the acoustic output unit of the acoustic output device may be a bone conduction speaker. In some embodiments, the acoustic output device may include a transducer device, a case, and an additional element. The transducer device can generate mechanical vibrations based on an electrical signal. The transducer device includes a magnetic circuit assembly, a coil, and a vibration transmission sheet. The case is used to house the transducer device and includes a panel and a housing. The transducer device transmits mechanical vibrations to the user through the panel. In the acoustic output device according to the embodiments of this specification, the vibration transmission sheet has elasticity, the magnetic circuit assembly is elastically connected to the case by the vibration transmission sheet, and the additional element is connected to the magnetic circuit assembly to maintain an elastic connection with the panel. For example, the magnetic circuit assembly may be elastically connected to the panel by the vibration transmission sheet so that it can maintain an elastic connection with the panel when the additional element is connected to the magnetic circuit assembly. Also, for example, the magnetic circuit assembly may be connected to a side wall (or called a back plate) facing the position of the panel of the housing by the vibration transmission sheet. Further, for example, the number of vibration transmission sheets may be plural. The plural vibration transmission sheets include a first vibration transmission sheet and a second vibration transmission sheet. The magnetic circuit assembly may be connected to the panel and the back plate by the first vibration transmission sheet and the second vibration transmission sheet respectively, whereby an elastic connection with the panel can be maintained when the additional element is connected to the magnetic circuit assembly. The connection between the additional element and the magnetic circuit assembly may be a direct connection or an indirect connection. For example, the additional element may be directly and rigidly connected to the magnetic circuit assembly. Also, for example, both the additional element and the magnetic circuit assembly are rigidly connected to the housing. Further, for example, the acoustic output device further includes a support member. The additional element is rigidly connected to the support member, and the support member is rigidly connected to the magnetic circuit assembly.In the acoustic output device according to the embodiment of the present specification, by connecting the additional element to the magnetic circuit assembly, it is possible to avoid the additional element and the magnetic circuit assembly attracting or repelling each other, causing the magnetic circuit assembly to reverse and deform, and affecting the vibration stability of the transducer device.

[0009] In the acoustic output device according to the embodiment of the present specification, the additional element and the magnetic circuit assembly can vibrate with respect to the panel to generate a resonance peak within the target frequency, and it can be guaranteed that the sensitivity of the acoustic output device is not affected by the additional element in a frequency range higher than the resonance frequency corresponding to the resonance peak. Thereby, the sensitivity within the frequency band range higher than the resonance frequency of the acoustic output device having the additional element is not affected by the additional element, and the problem of the decrease in the sensitivity of the bone conduction acoustic output device due to adding the additional element to the bone conduction speaker can be avoided. Also, in the acoustic output device according to the embodiment of the present specification, in a frequency range higher than the resonance frequency corresponding to the resonance peak, the frequency response curve of the acoustic output device is relatively flat, which guarantees that the acoustic output device has a good acoustic output effect and can improve the user's auditory experience. Furthermore, when the transducer device generates mechanical vibrations at a low frequency (a frequency range lower than the resonance frequency corresponding to the resonance peak), the low-frequency vibrations of the panel (vibrations lower than the resonance frequency corresponding to the resonance peak) are transmitted to the additional element to drive the additional element to vibrate together, and the mass of the additional element increases the mass of the vibration load of the transducer device, so that the sensitivity of the acoustic output device is affected by the additional element in a frequency range lower than the resonance frequency corresponding to the resonance peak. When the transducer device generates mechanical vibrations at a high frequency (a range higher than the resonance frequency corresponding to the resonance peak), since an elastic connection (for example, the presence of a vibration transmission sheet) is maintained between the additional element and the magnetic circuit assembly and the panel, the high-frequency vibrations of the panel hardly drive the additional element to vibrate together, and the mass of the additional element does not affect the mass of the vibration load of the transducer device, thereby guaranteeing that the sensitivity of the acoustic output device is not affected by the additional element in a frequency range higher than the resonance frequency corresponding to the resonance peak.

[0010] FIG. 1 is a schematic configuration diagram of an acoustic output device according to some embodiments of the present specification. As shown in FIG. 1, in some embodiments, the acoustic output device 100 may include a transducer device 10 and a case 20 that houses the transducer device 10. In some embodiments, the case 20 may include a panel 21 and a housing 22. The housing 22 is a hollow structure. The panel 21 and the housing 22 can form a housing cavity for housing the transducer device 10. The transducer device 10 may be connected to the panel 21, and the transducer device 10 can transmit mechanical vibrations to the user through the panel 21. In some embodiments, the panel 21 and the housing 22 may have an integrated structure. In some embodiments, the housing 22 may have an integrated structure or may be a structure formed by connecting a plurality of members. For example, in some embodiments, the housing 22 may include an annular side plate and a back plate. The back plate is fixed to the side of the annular side plate facing the panel 21 to form the housing 22. In some embodiments, the panel 21 and the housing 22 may have independent structures. The housing 22 is a hollow structure with an open-ended opening at one end. The panel 21 is rigidly connected to the end of the housing 22 having the open-ended opening, covering the open-ended opening of the housing 22 to form a housing cavity for housing the transducer device 10. In some embodiments, when the user wears the acoustic output device 100, the panel 21 fits on the user's head, and then mechanical vibrations can be transmitted to the user's auditory nerve through the human tissue and bone, allowing the user to hear bone-conducted sound. Note that the rigid connection according to the present specification means that when one of the two connecting members (for example, the panel 21 and the housing 22) is displaced or receives a force, the other connecting member connected thereto does not basically displace or relatively deform with respect to the first connecting member, that is, the two connecting members can be basically regarded as one whole during the vibration process. For example, the two connecting members are directly connected, and the tensile strength (Pa) of the entire two connecting members is greater than 50% of the tensile strength of the base material of any one of the two connecting members.Further, for example, two connecting members are connected by a rigid connecting element, and the tensile strength of the rigid connecting element itself is greater than the tensile strength of the base material of any one of the two connecting members. The rigid connection may be such that high-frequency vibrations (for example, vibrations greater than 6 KHz, greater than 8 KHz, or greater than 10 KHz) can be effectively transmitted between the two connecting members. Also, the rigid connection may be such that the resonance frequency due to vibration transmission between the two connecting members is at a very high frequency position. For example, the resonance frequency due to vibration transmission between the two connecting members is greater than 6000 Hz. Also, for example, the resonance frequency due to vibration transmission between the two connecting members is greater than 8000 Hz. Further, for example, the resonance frequency due to vibration transmission between the two connecting members is greater than 10000 Hz.

[0011] The transducer device 10 can convert an electrical signal into mechanical vibration and transmit it to the user by the panel 21. In some embodiments, the transducer device 10 may include a magnetic circuit assembly 11, a coil 12, and a vibration transmission sheet 13 (also referred to as an elastic support member). In some embodiments, the magnetic circuit assembly 11 may include at least one magnet 111, and the magnet 111 can generate a magnetic field. In some embodiments, the magnet 111 may include a magnetic flux conducting member 1111 and a magnetic member 1112. The magnetic flux conducting member 1111 may be a structure having a concave groove, and the magnetic member 1112 may be located in the concave groove and fixedly connected to the magnetic flux conducting member 1111, and a magnetic gap 1113 is formed between the side wall of the magnetic flux conducting member 1111 corresponding to the concave groove and the peripheral side wall of the magnetic member 1112. In some embodiments, the magnetic flux conducting member 1111 is processed from a soft magnetic material. In some embodiments, the soft magnetic material may include a metal material, a metal alloy, a metal oxide material, an amorphous metal material, etc. For example, iron, an iron-silicon-based alloy, an iron-aluminum-based alloy, a nickel-iron-based alloy, an iron-cobalt-based alloy, low-carbon steel, a silicon steel sheet, a silicon steel sheet, ferrite, etc. may be mentioned. In some embodiments, the magnetic member 1112 may be any element capable of generating a magnetic field. In some embodiments, the magnetic member 1112 may include a metal alloy magnet, ferrite, etc. The metal alloy magnet may include neodymium-iron-boron, samarium cobalt, alnico, iron-chromium-cobalt, aluminum-iron-boron, iron-carbon-aluminum, or the like, or a combination of multiple thereof. The ferrite may include barium ferrite, steel ferrite, magnesium manganese ferrite, lithium manganese ferrite, or the like, or a combination of multiple thereof.

[0012] In some embodiments, the magnetic circuit assembly 11 may be elastically connected to the case 20 by the vibration transmission sheet 13. In some embodiments, the magnetic circuit assembly 11 and the panel 21 may be elastically connected by the vibration transmission sheet 13. In some embodiments, between the magnetic circuit assembly 11 and the housing 22 (for example, the side wall adjacent to or facing the panel 21 in the housing 22), they may be elastically connected by the vibration transmission sheet 13. In some embodiments, the magnetic circuit assembly 11 may be elastically connected to the panel 21 and the housing 22 respectively by different vibration transmission sheets 13. For example, the vibration transmission sheet 13 may include a first vibration transmission sheet and a second vibration transmission sheet. The first vibration transmission sheet is located between the magnetic circuit assembly 11 and the panel 21, and the magnetic circuit assembly 11 and the panel 21 are elastically connected by the first vibration transmission sheet. The second vibration transmission sheet is located between the magnetic circuit assembly 11 and the side wall of the housing 22 facing the panel 21, and the magnetic circuit assembly 11 and the housing 22 are elastically connected by the second vibration transmission sheet. In some embodiments, at least a part of the coil 12 may be installed in the magnetic circuit assembly 11. For example, in some embodiments, one end of the coil 12 may be connected to the panel 21, and the other end of the coil 12 may be inserted into the magnetic gap 1113 of the magnetic circuit assembly 11. When the transducer device 10 operates, a signal current is passed through the coil 12. The coil 12 is located in the magnetic field generated by the magnet 111 and is subjected to the action of the Ampere force to generate mechanical vibration, thereby driving the panel 21 and the housing 22 to generate mechanical vibration, and the magnetic circuit assembly 11 receives a reaction force opposite to the coil. It should be noted that the "elastic connection" in this specification means that between two elastically connected connecting members, when one connecting member is displaced or receives a force, the other connecting member has the ability to displace or deform relative to the connecting member, or the two connecting members are connected by a member having elasticity. Also, the elastic connection may mean that the overall structure formed after the two connecting members are connected has a specific resonance frequency and the resonance is smaller than the target threshold value.In some embodiments, the target threshold may be 400 Hz, 600 Hz, 800 Hz, 1500 Hz, or 2000 Hz, and other values.

[0013] For more descriptions about the vibration transmission sheet 13, reference can be made to the related descriptions in other parts of this specification (for example, FIGS. 46 and 47 and their related descriptions).

[0014] It should be noted that the energy conversion method in the transducer device 10 in the embodiments of this specification may be the movable coil type described above, or may also be the electrostatic type, piezoelectric type, balanced armature type, pneumatic type, electromagnetic type, etc. The acoustic output device according to the embodiments of this specification (for example, the acoustic output device 100) may be any one of a speaker, earphone, hearing aid, glasses, augmented reality (AR) device, virtual reality (VR) device, or helmet, etc. Furthermore, elements such as the transducer device 10, panel 21, housing 22, magnetic circuit assembly 11, coil 12, and vibration transmission sheet 13 can be regarded as the acoustic output unit (also called a bone conduction speaker) of the acoustic output device 100 to provide sound.

[0015] In some embodiments, the acoustic output device 100 may further include a support structure 30, which is used to attach the bone conduction speaker of the acoustic output device 100 to the user's ear or head region (such as the mastoid process of the head, the temporal bone, the parietal bone, the frontal bone, etc., or the position in front of the user's ear on both the left and right sides of the head and on the sagittal axis of the human body) without blocking the user's ear canal. In some embodiments, the support structure 30 may be connected to the case 20 (such as the panel 21 or the housing 22). In some embodiments, the support structure 30 may be installed as an earhook and a rear hook structure to cooperate to surround the rear side of the head. In some embodiments, the support structure 30 may be installed as a head beam structure and installed around the user's head top. In some embodiments, the support structure 30 may have a shape adapted to the human ear, such as an annular shape, an elliptical shape, (regular or irregular) polygonal shape, a U shape, a V shape, a semi-circular shape, etc., so that it can be directly hung on the user's ear.

[0016] In fact, in order to be able to listen to stereo, the user can wear two bone conduction speakers simultaneously (that is, wear one bone conduction speaker on each of the left ear and the right ear). In some application scenarios where the requirement for stereo is not so high (such as hearing aid for patients with hearing impairment, cue presentation to the emcee during live broadcast, etc.), the user may wear only one bone conduction speaker.

[0017] In some embodiments, when the user wears two bone conduction speakers simultaneously, the support structure 30 may include a headband assembly and two earhook assemblies. Both ends of the headband assembly are respectively connected to one end of each corresponding earhook assembly. The other end of each earhook assembly, which is away from the headband assembly, is respectively connected to one corresponding bone conduction speaker. Further, the headband assembly may be installed in a curved shape so as to surround the rear side of the user's head, and the earhook assembly may be installed in a curved shape so as to be hung between the user's ear and head, and further, it is easy to realize the wearing requirement of wearing two bone conduction speakers simultaneously. In this way, the two bone conduction speakers are respectively located on the left and right sides of the user's head, and the two bone conduction speakers also fit into the user's ear or head area (for example, the face area in front of the auricle) due to the cooperative action of the support structure 30, and the user can also hear the sound output from the two bone conduction speakers.

[0018] In order to meet more functional requirements, the acoustic output device usually needs to add some additional elements (such as microphones, sensors, air conduction speakers, etc.) to the bone conduction speaker. For example, a microphone may be installed on the bone conduction speaker to collect the user's voice. Also, for example, in order to collect user information (such as the user's health status, exercise situation, etc.) or environmental information, etc., sensors (such as temperature sensors, humidity sensors, speed sensors, displacement sensors, etc.) may be installed on the bone conduction speaker. Further, for example, in order to ensure that the user has a good auditory experience by outputting bone conduction sound and / or air conduction sound to the user, an air conduction speaker may be installed based on the bone conduction speaker to form a speaker in which bone conduction and air conduction are combined. Also, the internal elements of the acoustic output device (such as batteries, circuit boards, etc.) may be integrated into the bone conduction speaker, and these internal elements of the acoustic output device and the above additional elements may be regarded as additional elements of the bone conduction speaker, and these additional elements may be directly integrated into the case of the bone conduction speaker or attached to the magnetic circuit assembly 11.

[0019] FIG. 2 is a schematic configuration diagram of an acoustic output device according to some embodiments of the present specification. As shown in FIG. 2, the acoustic output device 200 is obtained by installing an additional element 40 on the acoustic output device 100. In some embodiments, the additional element 40 is rigidly connected to the housing 22. When the additional element 40 is directly and rigidly connected to the housing 22, the load mass of the structure (panel 21, housing 22, additional element 40) driven by the transducer device 10 vibrates, which increases compared to the load mass when the additional element 40 is not installed, further reducing the sensitivity of the acoustic output device 200 and reducing the volume of the bone conduction sound output by the acoustic output device 200. Hereinafter, with reference to the frequency response curves of the acoustic output device 100 and the acoustic output device 200, the influence of the additional element on the speaker (bone conduction speaker) will be specifically described. In the present application, the additional element 40 may be installed in the accommodation cavity formed by the panel 21 and the housing 22, or may be fixed outside the accommodation cavity. For example, the additional element 40 may be located on the outer surface of the housing 22.

[0020] FIG. 3 is a frequency response curve diagram of an acoustic output device according to some embodiments of the present specification. As shown in FIG. 3, the horizontal axis is the frequency (Hz), the vertical axis is the corresponding sound pressure (dB) at different frequencies of the acoustic output device, the curve L31 is the frequency response curve of the acoustic output device 100, and the curve L32 is the frequency response curve of the acoustic output device 200. In order to easily measure the frequency response curves of the acoustic output device 100 and the acoustic output device 200 while the panel 21 vibrates and drives the air vibration on the panel 21 side to generate an air conduction sound, in the embodiments of the present specification, by measuring the sound pressure level of the air conduction sound near the panel 21, the vibration force level of the bone conduction sound of the acoustic output device is represented. As a merely illustrative explanation, a sound sensor (for example, a microphone) may be installed at a location close to the panel 21 to detect the sound pressure level of the air conduction sound generated by the panel 21 vibrating and vibrating the air on the panel 21 side. It can be understood that unless otherwise specifically described, the determination of the frequency response curve of the acoustic output device according to the present specification can be realized by using the above method.

[0021] As can be seen from the frequency response curves L31 and L32, in the frequency range of 20 Hz to 8000 Hz, the sound pressure of the acoustic output device 200 is generally smaller than that of the acoustic output device 100. That is, the sensitivity of the acoustic output device 200 is smaller than that of the acoustic output device 100. As can be understood from this, when additional elements are added to the bone conduction speaker in the acoustic output device, the additional elements affect the sensitivity of the bone conduction speaker. Specifically, it appears that the sensitivity of the bone conduction speaker decreases. The reason is that since the additional element 40 has a certain mass, the mass of the vibration load of the transducer device 10 increases. When the mass of the vibration load of the transducer device 10 increases (in this case, the mass of the vibration load of the transducer device 10 may include at least the mass of the panel 21, the housing 22, and the additional element 40), the sensitivity of the bone conduction speaker decreases, and the volume of the voice (bone conduction voice) output from the acoustic output device 200 becomes slightly lower.

[0022] Based on the above problem that the sensitivity of the bone conduction speaker decreases when an additional element is installed in the audio output device 200, the embodiments of this specification provide an audio output device. In some embodiments, the additional element may be connected to the panel by a vibration path including at least an elastic element. In the speaker according to the embodiments of this specification, the panel, the elastic element, the housing, and the additional element form a resonance system. The resonance system can be located at a second resonance position. The resonance system generates a second resonance frequency within a target frequency range at the second resonance position. In the frequency range after the second resonance frequency, the vibration transmission between the additional element and the panel is suppressed, that is, the influence of the additional element on the vibration of the panel is reduced. Thereby, it can be guaranteed that the sensitivity is not affected or is hardly affected by the additional element in the frequency range greater than the second resonance frequency. In some embodiments, by setting the second resonance frequency at a relatively low frequency position, it is possible to reduce the frequency range in which the sensitivity of the bone conduction speaker decreases due to the addition of an additional element to the bone conduction speaker. Also, in the frequency range greater than the second resonance frequency, the influence of the additional element on the panel vibration is relatively small, and the frequency response curve of the audio output device is flatter. Therefore, it can be guaranteed that the audio output device has a good audio output effect in a wide frequency range, and the user's auditory experience can be improved. In some embodiments, the above-mentioned second resonance frequency occurs when the panel and the additional element vibrate in opposite directions and the distance between them reaches the maximum value.When the transducer device generates mechanical vibrations at a low frequency (a frequency range lower than the second resonance frequency), the low-frequency vibrations of the panel (vibrations lower than the second resonance frequency) are transmitted to the additional element to drive the additional element to vibrate together. The mass of the additional element increases the mass of the vibration load of the transducer device, and the sensitivity of the speaker is affected by the additional element within a frequency lower than the second resonance frequency (similar to the acoustic output device 200). When the transducer device generates mechanical vibrations at a high frequency (higher than the second resonance frequency), due to the presence of the elastic element, the high-frequency vibrations of the panel hardly drive the additional element to vibrate together. The mass of the additional element does not affect the mass of the vibration load of the transducer device, thereby ensuring that the sensitivity of the acoustic output device is not affected or hardly affected by the additional element within a frequency range higher than the second resonance frequency.

[0023] In some specific application scenarios, since the additional element may have a magnetic member (for example, a member made of a magnetic material such as a metal alloy magnet, ferrite, an energized coil, etc.) or a magnetic flux conductive member (for example, a member made of a soft magnetic material such as iron, nickel-iron alloy, etc.), it attracts or repels the magnetic circuit assembly in the transducer device of the acoustic output device, causing the magnetic circuit assembly in the transducer device to undergo reverse deformation, affecting the stability of the vibrations of the transducer device and resulting in a low acoustic output effect of the acoustic output device.

[0024] Regarding the additional element and the magnetic circuit assembly in the transducer device, based on the problem that they may attract or repel each other and the magnetic circuit assembly may undergo reverse deformation, when the additional element is located on the side wall adjacent to the panel of the housing, in some embodiments, the vibration transmission sheet (also referred to as the elastic support member) in the transducer device can connect the magnetic circuit assembly and the side wall adjacent to the panel of the housing. That is, the vibration transmission sheet connects the magnetic circuit assembly and the side wall of the housing where the additional element is installed. In some embodiments, the transducer device may include at least two vibration transmission sheets. One of the vibration transmission sheets is located on the side facing the panel of the transducer device so as to be elastically connected to the transducer device and the panel, and the other vibration transmission sheet connects the transducer device and the housing, serves to support the transducer device, and is located on the side opposite to the panel of the transducer device to ensure that the transducer device can vibrate stably along the axial direction. Also, the vibration transmission sheet located on the side opposite to the panel of the transducer device can connect the magnetic circuit assembly and the side wall of the housing where the additional element is installed, thereby reducing or avoiding the problem that the additional element and the magnetic circuit assembly in the transducer device may attract or repel each other and the magnetic circuit assembly may undergo reverse deformation. In some embodiments, when the additional element and the support member are rigidly connected, the vibration transmission sheet of the transducer device can connect the magnetic circuit assembly and the support member. In this case, the vibration transmission sheet can provide support in the relative movement direction between the magnetic circuit assembly and the additional element, the vibration transmission sheet can play a better supporting role for the magnetic circuit assembly, and by improving the stability between the magnetic circuit assembly and the housing, it can avoid the situation that the additional element and the magnetic circuit assembly in the transducer device attract or repel each other and the magnetic circuit assembly undergoes reverse deformation, and can ensure the stability of the vibration of the transducer device.To improve the supporting effect of the magnetic circuit assembly by the vibration transmission sheet, in some embodiments, at least a part of the connection end connecting the vibration transmission sheet and the side wall of the housing is located within the orthographic projection of the additional element on the side wall of the housing. For example, at least one support rod of the vibration transmission sheet is located within the orthographic projection of the additional element on the side wall of the housing. In some embodiments, the vibration transmission sheet may include a central region and a plurality of support rods. The plurality of support rods are distributed at intervals along the peripheral side of the central region. The central region of the vibration transmission sheet is connected to the side away from the panel of the magnetic circuit assembly, and the end of the support rod away from the central region is connected to the housing. In some embodiments, the vibration transmission sheet is connected to the side away from the panel of the magnetic circuit assembly and is also connected to an intermediate region on the side away from the panel of the magnetic circuit assembly. The intermediate region may refer to the geometric central region on the side away from the panel of the magnetic circuit assembly. Preferably, the central region of the vibration transmission sheet is connected to the intermediate region on the side away from the panel of the magnetic circuit assembly. By way of merely exemplary illustration, the number of support rods may be four. In this case, the structure of the vibration transmission sheet can be approximately regarded as an "X" - shaped structure. The "X" - shaped structure can provide elasticity in the vibration direction of the transducer device. Also, the plurality of support rods have high structural strength in the direction perpendicular to the vibration direction of the transducer device and can provide a high supporting effect on the magnetic circuit assembly, thereby avoiding the transducer device from undergoing reverse deformation during its vibration. In some embodiments, the vibration transmission sheet may further include an edge region. The edge region is connected to the end of the support rod away from the central region, and the peripheral side of the edge region may be connected to the housing. For the specific structure of the vibration transmission sheet, reference can be made to the content in other parts of the specification of this application, such as FIGS. 46 and 47 and their related descriptions.

[0025] Hereinafter, with reference to the drawings (FIGS. 4 to 32), the acoustic output device according to the embodiments of this specification will be described in detail.

[0026] FIG. 4 is a schematic configuration diagram of an acoustic output device according to some embodiments of the present specification. Structures such as the transducer device 410 (including the magnetic circuit assembly 411, the coil 412, and the vibration transmission sheet 413A), the case 420 (including the panel 421 and the housing 422), and the support structure 430 in the acoustic output device 400 shown in FIG. 4 may be similar to the structures such as the transducer device 10 (including the magnetic circuit assembly 11, the coil 12, and the vibration transmission sheet 13), the case 20 (including the panel 21 and the housing 22), and the support structure 30 in the acoustic output device 200 shown in FIG. 2, and will not be further described here. The main difference between the acoustic output device 400 shown in FIG. 4 and the acoustic output device 200 shown in FIG. 2 is that the additional element 440 and the panel 421 are connected by a vibration path including the elastic element 450, that is, the panel 421 and the housing 422 are elastically connected by the elastic element 450, that is, the panel 421 and the structure (for example, the coil 412) rigidly connected to the panel 421, the elastic element 450, and the housing 422 and the structure (for example, the additional element 440, the support structure 430) rigidly connected to the housing 422 form a resonance system. Note that when other structures are rigidly connected to the panel 421 or the housing 422, these structures are also regarded as part of the resonance system. Here, taking the example that the additional element 440 and the housing 422 are rigidly connected, and the panel 421 and the housing 422 having the additional element 440 are elastically connected by the elastic element 450, in a relatively low frequency band (for example, within a frequency band range smaller than 20 Hz), the panel 421 and the housing 422 can be regarded as almost rigidly connected, the transducer device drives the panel 421 to vibrate, the panel 421 drives the housing 422 and the additional element 440 to vibrate together by the elastic element 45, and since the additional element 440 has a certain mass, the sensitivity of the acoustic output device having the additional element 440 is relatively low.In a relatively high frequency band (for example, within a frequency band range greater than 20 Hz), the panel 421, the elastic element 450, and the housing 422 can be regarded as approximately one resonance system. The transducer device drives the panel 421 to vibrate, and due to the action of the elastic element 450, relative movement occurs between the panel 421 and the housing 422 and a device (such as the additional element 440) rigidly connected to the housing 422. Specifically, when the vibration of the panel 421 is at a minimum value (for example, the vibration of the panel 421 is very small or does not vibrate), strong vibrations occur in the housing 422 and the additional element 440, and this can be regarded as the first resonance position of the resonance system. The resonance frequency corresponding to the first resonance position of the resonance system is the first resonance frequency. In the resonance systems of some embodiments, the frequency response curve of the acoustic output device 400 has a resonance dip at the first resonance frequency. It can be understood that in the resonance systems of some other embodiments, the frequency response curve of the acoustic output device 400 may not have an obvious resonance dip at the first resonance frequency. As the vibration frequency of the resonance system further increases, strong vibrations occur in both the panel 421 and the housing 422 (and the additional element 440 rigidly connected to the housing 422) until the panel 421 and the housing 422 vibrate in opposite directions and the distance between them reaches the maximum. This can be regarded as the second resonance position of the resonance system. The resonance frequency corresponding to the second resonance position of the resonance system is the second resonance frequency. In the resonance systems of some embodiments, the frequency response curve of the acoustic output device 400 has a resonance peak at the second resonance frequency. It can be understood that in the resonance systems of some other embodiments, the frequency response curve of the acoustic output device 400 may not have an obvious resonance peak at the second resonance frequency.When the frequency is greater than the resonance frequency, the panel 421 and the housing 422 (and the additional element 440 rigidly connected to the housing 422) vibrate along opposite directions. At this time, the vibration transmission between the housing 422 and the additional element 440 and the panel 421 is suppressed, that is, the influence of the housing 422 and the additional element 440 on the vibration of the panel 421 is reduced.

[0027] Viewed from the phase of the resonance system, the panel 421 and the housing 422 first move together. At this time, the panel 421, the housing 422, and the additional element 440 connected to the housing 422 vibrate together. At this time, the phase difference between the panel 421 and the housing 422 is 0°. As the frequency increases, the vibration of the panel 421 becomes very small or stops vibrating, and strong vibrations occur in the housing 422 and the additional element 440. That is, until the first resonance position is reached, the panel 421, the housing 422, and the additional element 440 first move in the same direction. As the frequency continues to increase, the value corresponding to the phase of the resonance system increases, and the panel 421 and the housing 422 (and the additional element 440) vibrate in opposite directions, and the distance between them becomes the largest. That is, until the second resonance position is reached, strong vibrations occur in both. At this time, the phase difference between the panel 421 and the housing 422 is within the range of 150° to 210°. At this time, the resonance system is at the second resonance position. Further, as the frequency continues to increase, the value corresponding to the phase of the resonance system gradually decreases. In the acoustic output device according to the embodiment of the present specification, the panel 421 and the housing 422 having the additional element 440 are connected by the elastic element 450, so that the panel 421 and the housing 422 having the additional element 440 can be resonated, and a second resonance frequency within the target frequency range can be generated. In a frequency range higher than the second resonance frequency, the vibration transmission between the additional element 440 and the panel 421 is suppressed, that is, the influence of the additional element 440 on the vibration of the panel 421 is reduced. Thereby, it can be guaranteed that the sensitivity of the bone conduction speaker in the acoustic output device is not affected or hardly affected by the additional element 440 in a frequency range higher than the resonance frequency corresponding to the second resonance frequency. In some embodiments, by setting the second resonance frequency to a relatively low frequency position, it is possible to reduce the frequency range in which the sensitivity of the bone conduction speaker in the acoustic output device decreases due to the addition of the additional element 440.Also, in a frequency range higher than the second resonance frequency, the influence on the vibration of the panel 421 of the additional element 440 is relatively small, and the frequency response curve of the acoustic output device is flatter. Therefore, it is ensured that the acoustic output device has a good acoustic output effect in a wide frequency range, and the user's auditory experience can be improved.

[0028] When another structure is rigidly connected to the panel 421, or when another structure is rigidly connected to the housing 422, for example, it can be understood that the panel 421 and the structure rigidly connected to the panel 421, the elastic element 450, and the housing 422 and the structure rigidly connected to the housing 422 form a resonance system.

[0029] As shown in FIG. 4, in some embodiments, the housing 422 is a structure with a hollow interior and an open-ended opening at one end. The panel 421 is located at the end of the housing 422 having the open-ended opening, and the elastic element 450 is located between the panel 421 and the housing 422 to achieve elastic connection between the panel 421 and the housing 422. The elastic element 450 here can be regarded as a part of the case 420 in the acoustic output device 400. The panel 421, the housing 422, and the elastic element 450 form a housing cavity for accommodating the transducer device 10. In some embodiments, the elastic element 450 may be a ring structure having elasticity, and the panel 421 and the housing 422 may be elastically connected by the ring structure to form a housing cavity for accommodating the transducer device 410. In some embodiments, the elastic element 450 may be a ring structure made of an elastic material such as silica gel or polyurethane. In some embodiments, the ring structure may be a single ring structure having pre-deformation ability or a structure having a plurality of folded rings. When the panel 421 and the housing 422 are connected by the ring structure, the ring structure having pre-deformation ability can exert a certain supporting effect on the panel 421 and the housing 422, and can improve the structural stability of the acoustic output device. In some embodiments, the panel 421 and the housing 422 may be elastically connected by an adhesive. The adhesive for bonding the panel 421 and the housing 422 may have a certain elasticity and can be regarded as the elastic element 450. In some embodiments, the adhesive for bonding the panel 421 and the housing 422 includes, but is not limited to, gel-based, silicone gel, acrylic acid-based, polyurethane-based, rubber-based, epoxy-based, hot melt-based, photocurable-based, etc. Preferably, it may be a silicone adhesive or a silicone sealing adhesive. In some embodiments, the additional element 440 may be rigidly connected to the housing 422 directly or indirectly.For example, in some embodiments, the additional element 440 can achieve a rigid connection with the side wall of the housing 422 (e.g., the side wall adjacent to the panel 421 in the housing 422 or the side wall opposite to the panel 421 in the housing 422) by means such as welding, locking, screwing connection, adhesive connection, etc. Also, for example, the additional element 440 can achieve a rigid connection with the housing 422 by connection members such as brackets and connecting rods. In some embodiments, the additional element 440 shown in FIG. 4 may include an element sensitive to the vibration direction (e.g., a speaker, an air-conduction microphone, an acceleration sensor). In the embodiment shown in FIG. 4, the additional element 440 is an air-conduction microphone sensitive to the vibration direction, and the vibration direction of the vibration diaphragm 441 of the air-conduction microphone (the "second direction" shown in FIG. 4) is substantially perpendicular to the vibration direction of the transducer device 410 (the "first direction" shown in FIG. 4). Here, the so-called substantially perpendicular means that the included angle between the vibration direction of the transducer device and the vibration direction of the vibration diaphragm of the air-conduction speaker is 75° - 100°, for example, 80°, 90° or 95°, etc. It can be understood in this way. In the process of the air-conduction speaker operating, when vibration occurs on the vibration diaphragm and the vibration direction of the transducer device is substantially perpendicular to the vibration direction of the vibration diaphragm of the air-conduction speaker, there is almost no superimposed effect between the vibration generated on the vibration diaphragm and the vibration generated on the transducer device. That is, when vibration occurs on the vibration diaphragm and the vibration direction of the transducer device is substantially perpendicular to the vibration direction of the vibration diaphragm of the air-conduction speaker, the volume of the sound leakage generated by the acoustic output device is slightly lower. Thus, when the acoustic output device is provided with an element sensitive to the vibration direction, it has a better sound leakage reduction effect. For the specific content of the additional element, which is a device sensitive to the vibration direction, reference can be made to the descriptions regarding FIGS. 4 and 28 in other parts of the specification of this application. It should be noted that the additional element 440 is not limited to the element sensitive to the vibration direction shown in FIG. 4, and it may be a battery, a circuit board, or a sensor not sensitive to the vibration direction (e.g., a temperature sensor, a humidity sensor, etc.). In this case, the additional element may be located at any position of the housing 422. In some embodiments, the additional element 440 may simultaneously include an element sensitive to the vibration direction and an element not sensitive to the vibration direction.For example, an element sensitive to the vibration direction is an acceleration sensor, an element not sensitive to the vibration direction is a circuit board, the circuit board is fixedly connected to the housing 422, and the acceleration sensor is installed on the circuit board.

[0030] The panel 421 and a structure (e.g., coil 412) rigidly connected to the panel 421, and the housing 422 and a structure (e.g., additional element 440) rigidly connected to the housing 422 are elastically connected by an elastic element 450 and can be regarded as approximately one resonance system. In some embodiments, the resonance system can be located at a second resonance position, generate a second resonance frequency whose resonance frequency is within a target frequency range, and in a frequency range after the resonance frequency corresponding to the second resonance frequency, the vibration transmission between the additional element 440 and the panel 421 is suppressed, that is, the influence of the additional element 440 on the vibration of the panel 421 is reduced, thereby ensuring that its sensitivity is not affected or hardly affected by the additional element 440 in a frequency range where the sensitivity is greater than the resonance frequency corresponding to the second resonance frequency. In some embodiments, by setting the resonance frequency corresponding to the second resonance frequency at a relatively low frequency position, the frequency range in which the sensitivity of the acoustic output device 400 is reduced by the additional element 440 can be reduced. Also, in a frequency range greater than the resonance frequency corresponding to the second resonance frequency, the influence of the additional element 440 on the vibration of the panel 421 is relatively small, and the frequency response curve of the acoustic output device 400 is flatter, so it can be guaranteed that the acoustic output device 400 has a good acoustic output effect in a wide frequency range and the user's auditory experience can be improved. In order to reduce the frequency range in which the additional element 440 affects the acoustic output device 400 and enable the acoustic output device 400 to have a flat frequency response curve in a wide frequency band, in some embodiments, by adjusting the ratio of the sum of the masses of the panel 421 and the elements rigidly connected to the panel 421 to the sum of the masses of the housing 422 and the elements fixedly connected to the housing 422, the elastic coefficient of the elastic element 450, etc., the resonance frequency corresponding to the second resonance frequency can be located within a specific low frequency range (also called the target frequency range). In some embodiments, the target frequency range may be 20 Hz to 800 Hz. Preferably, the target frequency range may be 100 Hz to 600 Hz. More preferably, the target frequency range may be 150 Hz to 500 Hz.More preferably, the target frequency range may be 200 Hz to 400 Hz. For specific details of the resonance frequency adjustment, reference can be made to FIG. 6 and its related description.

[0031] In a resonance system formed by elastically connecting a panel 421 and a structure (for example, a coil 412) rigidly connected to the panel 421 and a housing 422 having an additional element 440 and a structure (for example, the additional element 440) rigidly connected to the housing 422 by an elastic element 450, when the panel 421 hardly vibrates, the housing 422 continues to vibrate. In this case, the acoustic output device 400 can also generate a first resonance frequency whose resonance frequency is within the target frequency range. In some embodiments, the first resonance frequency may be smaller than the second resonance frequency. Further, the closer the corresponding frequencies of the first resonance frequency and the second resonance frequency are, the smaller the influence on the flatness of the frequency response curve in the overall frequency band of the acoustic output device 400 becomes. Accordingly, the sound quality in the overall frequency band of the acoustic output device 400 is also good. In order to make the frequency response curve in the overall frequency band of the acoustic output device 400 flatter, in some embodiments, the difference between the frequency corresponding to the second resonance frequency and the frequency corresponding to the first resonance frequency may be 300 Hz or less. Preferably, the difference between the frequency corresponding to the second resonance frequency and the frequency corresponding to the first resonance frequency may be 200 Hz or less. More preferably, the difference between the frequency corresponding to the second resonance frequency and the frequency corresponding to the first resonance frequency may be 100 Hz or less.

[0032] FIG. 5 is a frequency response curve diagram of an acoustic output device according to some embodiments of the present specification. FIG. 5 shows the frequency response curves of the acoustic output device 100 and the acoustic output device 400. Here, the horizontal axis is the frequency (Hz), the vertical axis is the corresponding sound pressure (dB) at different frequencies of the speaker, the curve L51 is the frequency response curve of the acoustic output device 100, the curve L52 is the frequency response curve of the acoustic output device 400, and the curve L53 is the frequency response curve of the acoustic output device 400 with increased attenuation. In the embodiment shown in FIG. 5, the frequency response curve of the acoustic output device 400 has a resonance dip at the first resonance frequency, and the frequency response curve of the acoustic output device 400 has a resonance peak at the second resonance frequency. In the present application, for the sake of easy explanation, only the mode in which the frequency response curve of the acoustic output device has an obvious resonance dip at the first resonance frequency and an obvious resonance peak at the second resonance frequency will be described as an example. It can be understood that the frequency response curve of the acoustic output device in the present application may not have an obvious resonance dip at the first resonance frequency and may not have an obvious resonance peak at the second resonance frequency. The resonance peak in region A is generated by the resonance system when the distance between the panel 421 and the housing 422 is at the maximum value, and the resonance dip in region B is generated by the resonance system when the panel 421 does not vibrate or the vibration of the panel 421 is at the minimum value and the housing 422 vibrates. According to the curve L52, it can be seen that in the frequency range of 200 Hz to 600 Hz, resonance peaks and resonance dips occur in the acoustic output device 400. The resonance peak occurs when the panel 421 and the additional element 440 vibrate in opposite directions and the distance between the panel 421 and the additional element 440 reaches the maximum value, and the resonance dip occurs when the panel 421 does not vibrate or the vibration of the panel 421 is at the minimum value and the housing 422 vibrates. Also, as shown in FIG. 3, in the frequency range of 200 Hz to 8000 Hz, the sensitivity of the acoustic output device 100 without the additional element installed in FIG. 3 is generally greater than the sensitivity of the acoustic output device 200 having the additional element.In FIG. 5, according to curves L51, L52, and L53, in a frequency range higher than the resonance frequency, the frequency response curves of the acoustic output device 400 and the acoustic output device 100 almost overlap. As can be seen from this, in a specific frequency band (for example, a frequency band higher than the resonance frequency corresponding to the resonance peak A), the acoustic output device 400 (the additional element 440 and the panel 421 are connected by a vibration path including the elastic element 450) has higher sensitivity than the acoustic output device 200 shown in FIG. 2 (the panel 21 and the housing 22 having the additional element 40 are rigidly connected). Further, according to curves L51, L52, and L53, in a frequency range higher than the resonance frequency corresponding to the resonance peak, curves L152 and L153 almost overlap L151 and are relatively flat. As can be seen from this, when the frequency is higher than the resonance frequency corresponding to the resonance peak, the frequency response curve of the acoustic output device 400 is relatively flat, and the additional element 440 (for example, an air conduction speaker, a sensor, a battery, a circuit board, etc.) in the acoustic output device 400 does not affect the sensitivity of the speaker 400 within a frequency range higher than the resonance frequency corresponding to the resonance peak. In order for the acoustic output device 400 to have a flat frequency response curve in a wide frequency band, in some embodiments, by adjusting the ratio of the mass of the panel 421 to the sum of the masses of the housing 422 and the additional element 440, the elastic coefficient of the elastic element 450, etc., the resonance frequency corresponding to the resonance peak can be positioned within a specific frequency range (for example, less than 2000 Hz, less than 1500 Hz, less than 800 Hz, less than 600 Hz). For the specific content of the resonance frequency adjustment, reference can be made to FIG. 6 and its related description.

[0033] In some embodiments, as can be seen from the curve L53, after increasing the attenuation of the acoustic output device 400, the sharpness of its resonance peak and resonance dip decreases and becomes relatively gentle. In this way, the acoustic output device 400 can have a relatively flat frequency response curve within a wider frequency range, and the acoustic output device 400 can output good sound quality within a wider frequency range. In some embodiments, a damping material can be installed on the elastic element 450 to increase the attenuation of the acoustic output device 400. In some embodiments, the damping material may include butyl rubber, acrylate rubber, polysulfide rubber, butyronitrile rubber, and silicone rubber, polyurethane resin, polyvinyl chloride resin, and epoxy resin, etc., or combinations thereof.

[0034] FIG. 6 is a frequency response curve diagram of the acoustic output device according to some embodiments of the present specification. FIG. 6 shows the frequency response curves of the acoustic output device 400 corresponding to different ratios of the mass of the panel 421 to the sum of the masses of the housing 422 and the additional element 440. Here, the horizontal axis is the frequency (Hz), the vertical axis is the corresponding sound pressure (dB) at different frequencies of the speaker, the curve L61 is the ratio of the sum of the mass of the panel 421 and the elements (e.g., coil 412) rigidly connected to the panel 421 to the sum of the mass of the housing 422 and the elements (e.g., additional element 440) rigidly connected to the housing 422 is 0.16, and the elastic coefficient is 588 N / m, and it is the frequency response curve of the acoustic output device 400 when the elastic coefficient is 588 N / m, the curve L62 is the ratio of the sum of the mass of the panel 421 and the elements rigidly connected to the panel 421 to the sum of the mass of the housing 422 and the elements rigidly connected to the housing 422 is 0.36, and the elastic coefficient is 2000 N / m, and it is the frequency response curve of the acoustic output device 400 when the elastic coefficient is 2000 N / m, the curve L63 is the ratio of the sum of the mass of the panel 421 and the elements rigidly connected to the panel 421 to the sum of the mass of the housing 422 and the elements rigidly connected to the housing 422 is 1.03, and it is the frequency response curve of the acoustic output device 400 when the ratio is 1.03, the curve L64 is the ratio of the sum of the mass of the panel 421 and the elements rigidly connected to the panel 421 to the sum of the mass of the housing 422 and the elements rigidly connected to the housing 422 is 3.07, and it is the frequency response curve of the acoustic output device 400 when the ratio is 3.07, the curve L65 is the ratio of the sum of the mass of the panel 421 and the elements rigidly connected to the panel 421 to the sum of the mass of the housing 422 and the elements rigidly connected to the housing 422 is 5.14, and it is the frequency response curve of the acoustic output device 400 when the ratio is 5.14. The resonance peak in the region C is the resonance peak generated during the vibration of the resonance system formed by the panel 421, the additional element 440, and the elastic element 450, and the resonance peaks in the region C of the curves L61 to L65 overlap. The resonance dip in the region D is the resonance dip generated during the vibration of the resonance system formed by the panel 421, the additional element 440, and the elastic element 450.

[0035] In some embodiments, as can be seen from curves L61 to L65, the frequency response curve of the acoustic output device 400 is relatively flat within a frequency range higher than the resonant frequency corresponding to the resonant peak. Thus, the acoustic output device 400 can output good sound quality within a frequency range higher than the resonant frequency corresponding to the resonant peak.

[0036] Furthermore, as shown in FIG. 6, as the ratio of the sum of the mass of the panel 421 and the elements rigidly connected to the panel 421 to the sum of the mass of the housing 422 and the elements rigidly connected to the housing 422 increases, the frequency corresponding to the resonant dip increases accordingly, the difference between the frequency corresponding to the resonant dip and the frequency corresponding to the resonant peak decreases, and when the difference between the resonant dip and the resonant peak decreases, the influence of the additional element 440 on the frequency response of the acoustic output device 400 decreases, the frequency response curve of the acoustic output device 400 becomes flatter, and the acoustic output device 400 has better sound quality. Therefore, by adjusting the ratio of the sum of the mass of the panel 421 and the elements rigidly connected to the panel 421 to the sum of the mass of the housing 422 and the elements rigidly connected to the housing 422, the influence of the additional element 440 on the frequency response of the acoustic output device 400 can be reduced. In some embodiments, the ratio of the sum of the mass of the panel 421 and the elements rigidly connected to the panel 421 to the sum of the mass of the housing 422 and the elements rigidly connected to the housing 422 may be in the range of 0.16 to 7. In some embodiments, the ratio of the sum of the mass of the panel 421 and the elements rigidly connected to the panel 421 to the sum of the mass of the housing 422 and the elements rigidly connected to the housing 422 may be 0.36 to 6. In some embodiments, the ratio of the sum of the mass of the panel 421 and the elements rigidly connected to the panel 421 to the sum of the mass of the housing 422 and the additional element 440 may be 1.03 to 5.14. In some embodiments, the ratio of the sum of the mass of the panel 421 and the elements rigidly connected to the panel 421 to the sum of the mass of the housing 422 and the elements rigidly connected to the housing 422 may be 1.03 to 3.07.

[0037] As shown in FIG. 4, the acoustic output device 400 may further include a support structure 430, and the support structure 430 may be rigidly connected to the housing 422. For example, the support structure 430 may be rigidly connected to the side wall of the housing 422 facing the panel 421.

[0038] FIG. 7 is a schematic configuration diagram of an acoustic output device according to some embodiments of the present application. As shown in FIG. 7, the support structure 430 in the acoustic output device 700 may be rigidly connected to the panel 421.

[0039] In some embodiments, the connection of the support structure 430 to the panel 421 or the housing 422 has little impact on the frequency response of the acoustic output device. Taking the case where the acoustic output device is an earphone or a hearing aid as an example, the support structure 430 may be an earhook, and the earhook is usually made of a flexible material and has good elastic deformation ability. Accordingly, the support structure 430 usually affects the vibration of the bone conduction speaker in a very low frequency band (for example, around 20 Hz and below), and this frequency band is usually a frequency band that cannot be heard by the human ear. Specifically, please refer to FIG. 8 and its related description. FIG. 8 is a frequency response curve diagram of an acoustic output device according to some embodiments of the present specification.

[0040] FIG. 8 shows the frequency response curves of the acoustic output device 400 and the acoustic output device 700. Here, the horizontal axis is the frequency (Hz), the vertical axis is the corresponding sound pressure (dB) at different frequencies of the acoustic output device 400, the curve L71 is the frequency response curve when the support structure 430 and the housing 422 in the acoustic output device 400 are rigidly connected, and the curve L72 is the frequency response curve when the support structure 430 and the panel 421 in the acoustic output device 700 are rigidly connected. As can be seen from the curves L71 and L72, the rigid connection between the support structure 430 and the panel 421 or the housing 422 has little effect on the frequency response of the acoustic output device 400. Therefore, in the acoustic output device 400 according to the embodiments of the present specification, the support structure 430 may be rigidly connected to the panel 421 or the housing 422.

[0041] In the audio output device 400 or 700, when the magnetic circuit assembly 411 and the panel 421 are connected by the vibration transmission sheet 413A, there may be a problem that the magnetic circuit assembly 411 and the additional element 440 attract or repel each other, causing the magnetic circuit assembly to reverse and deform, which affects the vibration stability of the transducer device 410. In order to avoid the magnetic circuit assembly 411 and the additional element 440 attracting or repelling each other, causing the magnetic circuit assembly to reverse and deform, and affecting the vibration stability of the transducer device, in some embodiments, the vibration transmission sheet 413A between the magnetic circuit assembly 411 and the panel 421 may be replaced with a vibration transmission sheet 413B (shown by a dashed line in FIGS. 4 and 7). As an exemplary explanation, the vibration transmission sheet 413B is located between the magnetic circuit assembly 411 and the side wall of the housing 422 facing the panel 421. One side of the vibration transmission sheet 413B may be connected to the side of the magnetic circuit assembly 411 away from the panel 421, and the peripheral side of the vibration transmission sheet 413B may be connected to the side wall of the housing 422 adjacent to the panel 421. Here, the vibration transmission sheet 413B is located between the magnetic circuit assembly 411 and the side wall of the housing 422 facing the panel 421. The vibration transmission sheet 413B can improve the support effect on the position close to the additional element 440 of the magnetic circuit assembly 411, and can improve the vibration stability of the transducer device, especially the magnetic circuit assembly 411. In some embodiments, in order to further improve the vibration stability of the transducer device 410, the audio output device 400 or 700 may include both the vibration transmission sheet 413A and the vibration transmission sheet 413B simultaneously.

[0042] FIG. 9 is a schematic configuration diagram of an acoustic output device according to some embodiments of the present specification. Structures such as the transducer device 910 (including a magnetic circuit assembly 911, a coil 912, a vibration transmission sheet 913A, and a vibration transmission sheet 913B), a case 920 (including a panel 921), a support structure 930, an additional element 940, and an elastic element 950 shown in FIG. 9 may be similar to the transducer device 410 (including a magnetic circuit assembly 411, a coil 412, a vibration transmission sheet 413A, and a vibration transmission sheet 413B), a case 420 (including a panel 421), a support structure 430, an additional element 440, and an elastic element 450 in the acoustic output device 400, respectively, and will not be further described here. The main difference between the acoustic output device 900 shown in FIG. 9 and the acoustic output device 700 shown in FIG. 7 is that in the acoustic output device 900, the housing 922 includes one or more pressure relief holes 9221 that communicate the air inside the case 920 with the outside air. In some embodiments, the pressure relief holes 9221 may be formed in side walls facing and / or adjacent to the position of the panel 921 of the housing 922. In some embodiments, the pressure relief holes 9221 may be installed in the elastic element 950. For example, when the elastic element 950 is a ring structure having elasticity, the pressure relief holes 9221 may be installed in the ring structure. Also, for example, in some embodiments, the elastic element 950 may be a leaf spring or an elastic mesh having a through hole, and the through hole or the gap of the elastic mesh may communicate the air outside and inside the housing 922 instead of the pressure relief holes 9221. Note that the pressure relief holes 9221 here may be applied to acoustic output devices according to other embodiments of the present specification, such as acoustic output devices 300, 400, 700, 1200, 1300, 1500, 1700, 1800, 1900, 2000, 2200, 2400, 2500, 2600, 2700, 2900, 3000, 3100, etc.

[0043] In the audio output device 900, when the magnetic circuit assembly 911 and the panel 921 are connected by the vibration transmission sheet 913A, there may be a problem that the magnetic circuit assembly 911 and the additional element 940 attract or repel each other, causing the magnetic circuit assembly to be reversely deformed and affecting the vibration stability of the transducer device 910. In order to avoid the magnetic circuit assembly 911 and the additional element 940 attracting or repelling each other and causing the magnetic circuit assembly to be reversely deformed and affecting the vibration stability of the transducer device, in some embodiments, the vibration transmission sheet 913A between the magnetic circuit assembly 911 and the panel 921 may be replaced with a vibration transmission sheet 913B (shown by a dashed line in FIG. 9). As an exemplary description, the vibration transmission sheet 913B is located between the magnetic circuit assembly 911 and the side wall of the housing 922 that faces the position of the panel 921. One side of the vibration transmission sheet 913B may be connected to the side away from the panel 921 of the magnetic circuit assembly 911, and the peripheral side of the vibration transmission sheet 913B may be connected to the side wall of the housing 922 adjacent to the panel 921. Here, the vibration transmission sheet 913B is located between the magnetic circuit assembly 911 and the side wall of the housing 922 that faces the panel 921. The vibration transmission sheet 913B can improve the support effect on the position close to the additional element 940 of the magnetic circuit assembly 911 and improve the vibration stability of the transducer device, especially the magnetic circuit assembly 911. In some embodiments, in order to further improve the vibration stability of the transducer device 910, the audio output device 900 may include the vibration transmission sheet 913A and the vibration transmission sheet 913B simultaneously.

[0044] FIG. 10 is a frequency response curve diagram of an acoustic output device according to some embodiments of the present specification. FIG. 10 shows the frequency response curves of acoustic output device 700 and acoustic output device 900. Here, the horizontal axis is the frequency (Hz), the vertical axis is the corresponding sound pressure (dB) at different frequencies of the acoustic output device, curve L101 is the frequency response curve of acoustic output device 700 and has a resonance peak 1011, and curve L102 is the frequency response curve of acoustic output device 900 and has a resonance peak 1021. As can be seen from curves L101 and L102, the resonance frequency corresponding to resonance peak 1011 is higher than the resonance frequency corresponding to resonance peak 1021, and the frequency range in which the sensitivity of acoustic output device 900 is not affected or is less affected by the additional element (i.e., the frequency range greater than the resonance frequency corresponding to resonance peak 1021) is wider than the frequency range in which the sensitivity of acoustic output device 700 is not affected or is less affected by the additional element (i.e., the frequency range greater than the resonance frequency corresponding to resonance peak 1011). Thus, by forming a pressure relief hole in the housing, it can be understood that the resonance frequency corresponding to the resonance peak generated by driving the elastic element to vibrate the additional element relative to the panel can be reduced, and the frequency range in which the sensitivity of the acoustic output device is not affected or is less affected by the additional element can be widened. Also, when the housing and / or the panel vibrate, external air vibrates and sound leakage occurs, and by forming a pressure relief hole in the housing of the acoustic output device, the sound leakage volume of the acoustic output device can also be reduced. Specifically, the pressure relief hole can reduce the sound leakage volume of the acoustic output device by guiding the sound generated by the vibration of the magnetic circuit assembly inside the accommodation cavity to the outside and canceling out the sound leakage generated by the vibration of the housing and / or the panel.

[0045] In some embodiments, by adjusting the mass of the additional element, it is possible to reduce the sound leakage volume in a frequency range higher than the resonance frequency corresponding to the resonance peak of the acoustic output device. FIG. 11 is a frequency response curve diagram of an acoustic output device according to some embodiments of the present specification. FIG. 11 shows the sound leakage frequency response curve on the back plate side of the acoustic output device 900 (i.e., the side wall side facing the position of the panel 921 in the housing 922) and the frequency response curve on the panel 921 side when the mass of the additional element is different. Here, the horizontal axis is the frequency (Hz), the vertical axis is the corresponding sound pressure (dB) at different frequencies of the acoustic output device, the curve L111 is the sound leakage frequency response curve of the acoustic output device 900 when the mass of the additional element is 0 g, the curve L112 is the sound leakage frequency response curve of the acoustic output device 900 when the mass of the additional element is 0.7 g, the curve L113 is the sound leakage frequency response curve of the acoustic output device 900 when the mass of the additional element is 1.4 g, the curve L114 is the sound leakage frequency response curve of the acoustic output device 900 when the mass of the additional element is 2.1 g, the region 1101 is the frequency response curve of the acoustic output device 900 when having additional elements with different masses, and the region 1102 is the resonance peak region of the acoustic output device 900 when having additional elements with different masses. In some embodiments, the sound leakage frequency response curve of the acoustic output device 900 may be measured by collecting the air-conducted sound on the side wall side facing the position of the panel 921 in the housing 922, and the frequency response curve of the acoustic output device 900 may be measured by collecting the air-conducted sound on the panel 921 side. As shown in the regions 1101 and 1102 in FIG. 11, within a frequency range higher than the resonance frequency corresponding to the resonance peak region (region 1102) (including the frequency range corresponding to the region 1101), when the acoustic output device 900 has additional elements with different masses, the sensitivity of the acoustic output device 900 is substantially the same, that is, the sensitivity of the acoustic output device 900 does not improve with the increase in the mass of the additional element. In some embodiments, as can be seen from the curves L111 to L114, as the mass of the additional element increases, the resonance frequency corresponding to the resonance peak in the sound leakage frequency response curve of the acoustic output device 900 decreases.In some embodiments, by adjusting the mass of the additional element, the resonance frequency corresponding to the resonance peak in the sound leakage frequency response curve of the acoustic output device is made smaller than the resonance frequency corresponding to the resonance peak in the frequency response curve of the acoustic output device. Further, the acoustic output device 900 can reduce the sound leakage volume generated in a frequency band where its sensitivity is not affected by the mass of the additional element (for example, 300 Hz to 8000 Hz). In some embodiments, the resonance frequency corresponding to the resonance peak in the sound leakage frequency response curve of the acoustic output device may be 700 Hz or less, preferably, the resonance frequency corresponding to the resonance peak in the sound leakage frequency response curve of the acoustic output device may be 500 Hz or less. More preferably, the resonance frequency corresponding to the resonance peak in the sound leakage frequency response curve of the acoustic output device may be 300 Hz or less. Even more preferably, the resonance frequency corresponding to the resonance peak in the sound leakage frequency response curve of the acoustic output device may be 200 Hz or less.

[0046] Note that the mode of adjusting the mass of the decompression hole and the additional element is not only applicable to the acoustic output device 900, but also applicable to other acoustic output devices according to the embodiments of the present specification (for example, acoustic output devices 400, 700, 1200, etc.).

[0047] FIG. 12 is a schematic configuration diagram of an acoustic output device according to some embodiments of the present specification. The transducer device 1210 (including a magnetic circuit assembly 1211, a coil 1212, a vibration transmission sheet 1213A, and a vibration transmission sheet 1213B), the case 1220 (including a panel 1221), the support structure 1230, and the additional element 1240 in the acoustic output device 1200 shown in FIG. 12 may be similar to the transducer device 410 (including a magnetic circuit assembly 411, a coil 412, a vibration transmission sheet 413A, and a vibration transmission sheet 413B), the case 420 (including a panel 421), the support structure 430, and the additional element 440 in the acoustic output device 700, respectively, and will not be further described here. The main difference between the acoustic output device 1200 and the acoustic output device 700 is that the side wall (also referred to as the back plate 12221) of the housing 1222 facing the panel 1221 in the acoustic output device 1200 is connected to the other side wall (the side wall adjacent to the panel 1221 in the housing 1222, also referred to as the housing body 12222) of the housing 1222 by an elastic element 1260. In some embodiments, as shown in FIG. 12, the elastic element 1260 may be a ring structure, and the ring structure is made of an elastic material. As an exemplary explanation, in some embodiments, the housing 1222 may include a housing body 12222 and a back plate 12221. The housing body 12222 is the side wall adjacent to the panel 1221 in the housing 1222, and the back plate 12221 is the side wall facing the panel 1221 in the housing 1222. The back plate 12221 is installed independently of the housing body, the ring structure is provided around the circumferential side of the back plate 12221, and the circumferential side of the ring structure is connected to the side wall of the housing body 12222. Note that the structure of the elastic element 1260 shown in FIG. 12 is merely an example and is not limited thereto. In some embodiments, the elastic element 1260 may be a structure having other shapes (for example, strip-shaped, sheet-shaped, plate-shaped, etc.) made of an elastic material.In some embodiments, the elastic material may include any one or a combination of polycarbonate (PC), polyamide (PA), acrylonitrile-butadiene-styrene copolymer (ABS), polystyrene (PS), high impact polystyrene (HIPS), polypropylene (PP), polyethylene terephthalate (PET), polyvinyl chloride (PVC), polyurethanes (PU), polyethylene (PE), phenol formaldehyde (PF), urea-formaldehyde (UF), melamine-formaldehyde (MF), polyarylate (PAR), polyetherimide (PEI), polyimide (PI), polyethylene naphthalate two formic acid glycol ester (PEN), polyetheretherketone (PEEK), carbon fiber, graphene, silica gel, etc. In some embodiments, the elastic element 1260 may be an elastic structure, which refers to that the structure itself has elasticity. Even if the material is hard, since the structure itself has elasticity, the elastic element 1260 itself has elasticity. In some embodiments, the elastic structure may include a structure such as a leaf spring structure, that is, the elastic element 1260 may be a leaf spring structure. In some embodiments, the elastic element 1260 may be an adhesive having a certain elasticity for adhering the housing body 12222 and the back plate 12221. In some embodiments, the adhesive having a certain elasticity may be a silicone adhesive, a silicone adhesive, etc.In some embodiments, the connection between the housing body 12222 and the back plate 12221 may be a sealed connection. In some embodiments, the connection between the housing body 12222 and the back plate 12221 does not have to be a sealed connection, and the gap between the housing body 12222 and the back plate 12221 serves as a decompression hole to communicate the air inside the housing 1222 with the outside air, thereby reducing the resonant frequency corresponding to the resonance peak of the acoustic output device 1200 and making the frequency range in which the sensitivity of the acoustic output device 1200 is not affected by the additional element (or corresponding to a flat frequency response curve) wider.

[0048] The back plate 12221 in the acoustic output device 1200 is connected to the housing body 12222 by an elastic element 1260. The back plate 12221 and the elastic element 1260 can be equivalent to a single mass - elastic module, and this mass - elastic module can have the effect of vibration insulation, preventing the high - frequency vibration generated by the transducer device 1210 from being transmitted to the back plate 12221 and avoiding the back plate 12221 from vibrating at high frequencies and generating high - frequency sound leakage.

[0049] It should be noted that in other acoustic output devices according to the embodiments of this specification (for example, the acoustic output device 400 shown in FIG. 4, the acoustic output device 900 shown in FIG. 9, the acoustic output device 1300 shown in FIG. 13, etc.), the back plate and the housing body may be connected by an elastic element to avoid the acoustic output device from generating high - frequency sound leakage on the back - plate side.

[0050] In the audio output device 1200, when the magnetic circuit assembly 1211 and the panel 1221 are connected by the vibration transmission sheet 1213A, there may be a problem that the magnetic circuit assembly 1211 and the additional element 1240 attract or repel each other, causing the magnetic circuit assembly to be reversely deformed and affecting the vibration stability of the transducer device 1210. In order to avoid the magnetic circuit assembly 1211 and the additional element 1240 attracting or repelling each other and causing the magnetic circuit assembly 1211 to be reversely deformed and affecting the vibration stability of the transducer device 1210, in some embodiments, the vibration transmission sheet 1213A between the magnetic circuit assembly 1211 and the panel 1221 may be replaced with the vibration transmission sheet 1213B (shown by the dashed line in FIG. 12). As an exemplary explanation, the vibration transmission sheet 1213B is located between the magnetic circuit assembly 1211 and the side wall of the housing 1222 facing the panel 1221. One side of the vibration transmission sheet 1213B may be connected to the side away from the panel 1221 of the magnetic circuit assembly 1211, and the peripheral side of the vibration transmission sheet 1213B may be connected to the side wall (housing body 12222) adjacent to the panel 421 of the housing 1222. Here, the vibration transmission sheet 1213B is located between the magnetic circuit assembly 1211 and the side wall of the housing 1222 facing the panel 1221. The vibration transmission sheet 1213B can improve the support effect on the position close to the additional element 1240 of the magnetic circuit assembly 1211 and improve the vibration stability of the transducer device, especially the magnetic circuit assembly. In some embodiments, in order to further improve the vibration stability of the transducer device 1210, the audio output device 1200 may include the vibration transmission sheet 1213A and the vibration transmission sheet 1213B simultaneously.

[0051] In some embodiments, as shown in FIG. 12, the magnetic circuit assembly 1211 may include a hole 12111 and a positioning rod 12112. The hole 12111 may penetrate the magnetic circuit assembly 1211 along the vibration direction of the transducer device 1210 (the first direction shown in FIG. 12). One end of the positioning rod 12112 away from the panel 1221 is connected to the back plate 12221, and the other end passes through the hole 12111 and is connected to the panel 1221. In some embodiments, the other end of the positioning rod 12112 may be connected to the panel 1221. The panel 1221 can drive the back plate 12221 to vibrate together, reducing sound leakage caused by the panel 1221 and the back plate 12221 not vibrating synchronously. At the same time, the engagement between the positioning rod 12112 and the hole 12111 further improves the stability of the magnetic circuit assembly 1211 and can reduce the risk of the magnetic circuit assembly 1211 being attracted or repelled by the additional element 1240 and undergoing reverse deformation.

[0052] It should be noted that the fact that the magnetic circuit assembly includes the hole 12111 and the positioning rod 12112 is similarly applicable to other acoustic output devices in the embodiments of this specification, such as the acoustic output device 400 shown in FIG. 4, the acoustic output device 700 shown in FIG. 7, the acoustic output device 900 shown in FIG. 9, the acoustic output device 1300 shown in FIG. 13, the acoustic output device 1500 shown in FIG. 15, etc.

[0053] FIG. 13 is a schematic configuration diagram of an acoustic output device according to some embodiments of the present specification. As shown in FIG. 13, the acoustic output device 1300 includes a transducer device 1310, a case 1320, a support structure 1330, an additional element 1340, and an elastic element 1350. The transducer device 1310 may include a magnetic circuit assembly 1311, a coil 1312, a vibration transmission sheet 1313A, and a diaphragm 1314. The diaphragm 1314 and the magnetic circuit assembly 1311 are elastically connected by the vibration transmission sheet 1313A. In some embodiments, the case 1320 may include a panel 1321 and a housing 1322. In some embodiments, the housing 1322 may include a back plate 13221 facing the position of the panel 1321 and a housing body 13222 adjacent to the position of the panel 1321. The support structure 1330 may be rigidly connected to the panel 1321 or the housing 1322 (e.g., the back plate 13221 or the housing body 13222). In some embodiments, the elastic element 1350 may be a damping sheet. The panel 1321 may be elastically connected to the housing 1322 by the damping sheet. The additional element 1340 may be rigidly connected to the housing 1322. The panel 1321 may be rigidly connected to the diaphragm 1314. The housing 1322 is connected to the diaphragm 1314 and the panel 1321 by the damping sheet. As an exemplary explanation, the diaphragm 1314 may be connected to the coil 1312. When the transducer device 1310 operates, the coil 1312 can drive the diaphragm 1314 and the panel 1321 to vibrate mechanically. The diaphragm 1314 and the panel 1321 may be rigidly connected by a rigid member (e.g., a connecting rod). The rigid member may be connected to the housing 1322 (a side wall adjacent to the panel 1321 in the housing 1322) by the damping sheet, thereby realizing the connection between the housing 1322 and the diaphragm 1314 and the panel 1321.In some embodiments, the panel 1321 and the structures rigidly connected to the panel (e.g., the diaphragm 1314, the coil 1312, etc.), the elastic element 1350, and the housing 1322 and the structures rigidly connected to the housing 1322 (e.g., the additional element 1340, the support structure 1330, etc.) form a resonant system. In addition, when other structures are rigidly connected to the panel 1321 or the housing 1322, these structures are also regarded as part of the resonant system. The resonant system can generate a resonant peak within the target frequency range, and in the frequency range after the resonant frequency corresponding to the resonant peak, the vibration transmission between the additional element 1340 and the panel 1321 is suppressed, that is, the influence of the additional element 1340 on the vibration of the panel 1321 is reduced, thereby ensuring that its sensitivity is not affected or hardly affected by the additional element 1340 in the frequency range where the frequency is greater than the resonant frequency corresponding to the resonant peak. In some embodiments, by setting the resonant frequency corresponding to the resonant peak at a relatively low frequency position, the frequency range in which the sensitivity of the acoustic output device 1300 is reduced by the additional element 1340 can be reduced. Also, in the frequency range greater than the resonant frequency corresponding to the resonant peak, the influence of the additional element 1340 on the vibration of the panel 1321 is relatively small, and the frequency response curve of the acoustic output device 1300 is flatter, so it can be guaranteed that the acoustic output device 1300 has a good acoustic output effect in a wide frequency range, and the user's auditory experience can be improved.

[0054] The housing 1322, the support structure 1330, the additional element 1340, the magnetic circuit assembly 1311, the coil 1312, the vibration transmission sheet 1313A, etc. may be similar to the housing 422, the support structure 430, the additional element 440, the magnetic circuit assembly 411, the coil 412, the vibration transmission sheet 413A, etc. in the acoustic output device 400 respectively, and will not be further described here.

[0055] In some embodiments, the vibration damping sheet may be a sheet-like structure made of an elastic material (e.g., silica gel, polyurethane, etc.). In some embodiments, the vibration damping sheet may be an elastic structure (e.g., a leaf spring structure) having elasticity in its structure itself. Due to the presence of the vibration damping sheet, the mechanical vibration generated by the transducer device 1310 is hardly transmitted to the housing 1322 and may not be transmitted at all. The mass of the housing 1322 and the additional element 1340 does not cause an increase in the mass of the vibration load of the transducer device 1310 in a frequency range higher than the resonance frequency corresponding to the resonance peak. Thereby, it is ensured that the sensitivity within a frequency range higher than the resonance frequency corresponding to the resonance peak of the acoustic output device 1300 is not affected by the additional element 1340 and the housing 1322 (and related members installed in the housing 1322, e.g., the support structure 1330, the battery, the circuit board), and the frequency response curve of the acoustic output device 1300 is relatively flat in a frequency range higher than the resonance frequency corresponding to the resonance peak, thereby ensuring that the acoustic output device 1300 can output good sound quality.

[0056] In some embodiments, in order to avoid high-frequency sound leakage from occurring on the side of the acoustic output device 1300 facing the panel 1321 of the housing 1322, the side wall (i.e., the back plate 13221) facing the position of the panel 1321 of the housing 1322 can be connected to other side walls of the housing 1322 (e.g., the housing body 13222) by an elastic element. In some embodiments, the method in which the housing body 12222 and the back plate 12221 in the acoustic output device 1200 shown in FIG. 12 are connected by the elastic element 1260 is similarly applicable to the connection between the housing body 13222 and the back plate 13221 in the acoustic output device 1300.

[0057] FIG. 14 is a frequency response curve diagram of an acoustic output device according to some embodiments of the present specification.

[0058] FIG. 14 shows the frequency response curves of the acoustic output device 200 and the acoustic output device 1300 when the mass of the additional element is different. Here, the horizontal axis is the frequency (Hz), the vertical axis is the corresponding sound pressure (dB) at different frequencies of the acoustic output device, the curve L141 is the frequency response curve of the acoustic output device 200 when the mass of the additional element 40 is 0 g, the curve L142 is the frequency response curve of the acoustic output device 200 when the mass of the additional element 40 is 1, the curve L144 is the frequency response curve of the acoustic output device 200 when the mass of the additional element 40 is 2 g, the curve L145 is the frequency response curve of the acoustic output device 200 when the mass of the additional element 40 is 3 g, the curve L146 is the frequency response curve of the acoustic output device 1300 when the mass of the additional element 1340 is 2 g, the curve L147 is the frequency response curve of the acoustic output device 1300 when the mass of the additional element 1340 is 0 g, the curve L148 is the frequency response curve of the acoustic output device 1300 when the mass of the additional element 1340 is 3 g, and the curve L149 is the frequency response curve of the acoustic output device 1300 when the mass of the additional element 1340 is 1 g.

[0059] As can be seen from the frequency response curves of the acoustic output device 200 and the acoustic output device 1300, in the frequency range of 500 Hz to 5000 Hz, the sound pressure output by the acoustic output device 1300 is generally greater than the sound pressure output by the acoustic output device 200. That is, in the frequency range of 500 Hz to 5000 Hz, the sensitivity of the acoustic output device 1300 is greater than the sensitivity of the acoustic output device 200. Therefore, the acoustic output device 1300 can solve the problem of sensitivity reduction caused by installing additional elements on the bone conduction acoustic output device with respect to the acoustic output device 200. Also, as can be seen from the frequency response curve of the acoustic output device 200, in the frequency range of 500 Hz to 5000 Hz, as the mass of the additional element 40 increases, the sound pressure of the acoustic output device 200 generally decreases, that is, the sensitivity of the acoustic output device 200 decreases. As can be understood from this, the sensitivity of the acoustic output device 200 is affected by the mass of the additional element 40. As can be seen from the frequency response curve of the acoustic output device 1300, in the frequency range of 500 Hz to 5000 Hz, the frequency response curve of the acoustic output device 1300 is relatively flat. As the mass of the additional element 1340 increases, the sound pressure of the acoustic output device 1300 does not change overall, that is, the sensitivity of the acoustic output device 1300 does not change. As can be understood from this, in the frequency range of 500 Hz to 5000 Hz, the sensitivity of the acoustic output device 1300 does not change due to the influence of the mass of the additional element 1340. The acoustic output device 1300 has a relatively flat frequency response curve in the frequency range of 500 Hz to 5000 Hz. In this way, it is guaranteed that the acoustic output device 1300 can output good sound quality.

[0060] In the acoustic output device 1300, when the magnetic circuit assembly 1311 and the diaphragm 1314 are connected by the vibration transmission sheet 1313A, there may be a problem that the magnetic circuit assembly 1311 and the additional element 1340 attract or repel each other, causing the magnetic circuit assembly to reversibly deform and affecting the vibration stability of the transducer device 1310. To avoid the magnetic circuit assembly 1311 and the additional element 1340 attracting or repelling each other and causing the magnetic circuit assembly 1311 to reversibly deform and affect the vibration stability of the transducer device 1310, in some embodiments, the vibration transmission sheet 1313A between the magnetic circuit assembly 1311 and the diaphragm 1314 may be replaced with a vibration transmission sheet 1313B (shown by a dashed line in FIG. 13). As an exemplary explanation, the vibration transmission sheet 1313B is located between the magnetic circuit assembly 1311 and the side wall facing the panel 1321 of the housing 1322. One side of the vibration transmission sheet 1313B may be connected to the side away from the panel 1321 of the magnetic circuit assembly 1311, and the peripheral side of the vibration transmission sheet 1313B may be connected to the side wall (housing body 1322) adjacent to the panel 1321 of the housing 1322. Here, the vibration transmission sheet 1313B is located between the magnetic circuit assembly 1311 and the side wall of the housing 1322 facing the panel 1321. The vibration transmission sheet 1313B can improve the support effect on the position close to the additional element 1340 of the magnetic circuit assembly 1311 and improve the vibration stability of the transducer device, particularly the magnetic circuit assembly 1311. In some embodiments, in order to further improve the vibration stability of the transducer device 1310, the acoustic output device 1300 may include both the vibration transmission sheet 1313A and the vibration transmission sheet 1313B at the same time.

[0061] FIG. 15 is a schematic configuration diagram of an acoustic output device according to some embodiments of the present specification.

[0062] As shown in FIG. 15, structures such as the transducer device 1510 (including the magnetic circuit assembly 1511, the coil 1512, and the vibration transmission sheet 1513A), the case 1520 (including the panel 1521 and the housing 1522), the support structure 1530, and the additional element 1540 in the acoustic output device 1500 may be similar to the structures such as the transducer device 410 (including the magnetic circuit assembly 411, the coil 412, and the vibration transmission sheet 413A), the case 420 (including the panel 421 and the housing 422), the support structure 430, and the additional element 440 in the acoustic output device 400, and will not be further described here. The difference between the acoustic output device 1500 and the acoustic output device 400 is that in the acoustic output device 1500, the panel 1521 is rigidly connected to the housing 1522, the additional element 1540 is connected to the side wall of the housing 1522 by the elastic element 1550, and the additional element 1540 and the elastic element 1550 can be made into at least a part of the structure of the side wall of the housing 1522. The side wall of the housing 1522 may include a side wall (i.e., the back plate 15221) facing the position of the panel 1521 and a side wall (i.e., the housing body 15222) adjacent to the position of the panel 1521. In some embodiments, the elastic element 1550 may be a ring structure having elasticity, and the additional element 1540 may be connected to the side wall of the housing 1522 by the ring structure. As an exemplary explanation, a hole or groove conforming to the shape of the additional element 1540 is formed in the side wall of the housing 1522, the ring structure is fitted on the circumferential side of the additional element 1540, and the additional element 1540 with the ring structure fitted thereon may be fitted into the hole or groove in the side wall of the housing 1522 so that the additional element 1540 and the elastic element 1550 can be made into a part of the side wall. In some embodiments, instead of the ring structure having elasticity, an adhesive having elasticity may be used to adhere the circumferential side of the additional element 1540 to the inner wall of the hole or groove in the side wall of the housing 1522.In some embodiments, the elastic element 1550 may be a leaf spring structure, and the additional element 1540 may be connected to the surface of the leaf spring structure or fitted into the leaf spring structure. The peripheral side of the leaf spring structure may be connected to the panel 1521 and / or other side walls of the housing 1522. The additional element 1540 and the elastic element 1550 can fully function as one side wall or a part of one side wall of the housing 1522. In this case, the elastic element 1550, the additional element 1540, the panel 1521, and the housing 1522 can jointly surround a receiving cavity. In some embodiments, the leaf spring structure may be a sheet-like structure having elasticity made of a metal material (such as iron, aluminum, copper, etc.) or a non-metal material (such as rubber, polyurethane-based material, etc.). In some embodiments, the acoustic output device 1500 may include a support plate (not shown in FIG. 15), and the additional element 1540 may be installed on the support plate. The support plate is connected to the side wall of the housing 1522 by the elastic element 1550. The support plate may be located inside or outside the housing 1522. Alternatively, the elastic element 1550 and the support plate may be one side wall or a part of one side wall of the housing 1522.

[0063] In some embodiments, between the panel 1521, the housing 1522, and a structure (such as the coil 1512, the support structure 1530, etc.) rigidly connected to the panel 1521 or the housing 1522, and the additional element 1540, they are elastically connected by an elastic element 1550 to form a resonant system. In addition, when other structures are rigidly connected to the panel 1521 or the housing 1522, these structures are also regarded as part of the resonant system. The resonant system can generate a resonant peak within a target frequency range, and within the frequency range after the resonant frequency corresponding to the resonant peak, the vibration transmission between the additional element 1540 and the panel 1521 is suppressed, that is, the influence of the additional element 1540 on the vibration of the panel 1521 is reduced. Thereby, it can be guaranteed that the additional element 1540 is not affected or hardly affected in the frequency range where its sensitivity is greater than the resonant frequency corresponding to the resonant peak. In some embodiments, by setting the resonant frequency corresponding to the resonant peak at a relatively low frequency position, the frequency range in which the sensitivity of the acoustic output device 1500 is reduced by the additional element 1540 can be reduced. Also, in the frequency range greater than the resonant frequency corresponding to the resonant peak, the influence of the additional element 1540 on the vibration of the panel 1521 is relatively small, and the frequency response curve of the acoustic output device 1500 is flatter. Therefore, it can be guaranteed that the acoustic output device 1500 has a good acoustic output effect in a wide frequency range, and the user's auditory experience can be improved. In some embodiments, the elastic element 1550 can drive the additional element 1540 to vibrate relative to the panel 1521 to generate a resonant dip within the target frequency range. In some embodiments, the target frequency range may be 20 Hz to 800 Hz. Preferably, the target frequency range may be 100 Hz to 600 Hz. More preferably, the target frequency range may be 150 Hz to 500 Hz. Even more preferably, the target frequency range may be 200 Hz to 400 Hz. In some embodiments, the frequency corresponding to the resonant dip may be smaller than the frequency corresponding to the resonant peak.In some embodiments, the difference between the frequency corresponding to the resonance peak and the frequency corresponding to the resonance dip may be 300 Hz or less. In some embodiments, the difference between the frequency corresponding to the resonance peak and the frequency corresponding to the resonance dip may be 200 Hz or less. In some embodiments, the difference between the frequency corresponding to the resonance peak and the frequency corresponding to the resonance dip may be 100 Hz or less. In some embodiments, the difference between the resonance peak and the resonance dip may be in the range of 20 dB to 100 dB. In some embodiments, the difference between the resonance peak and the resonance dip may be in the range of 20 dB to 60 dB. In some embodiments, the difference between the resonance peak and the resonance dip may be in the range of 20 dB to 40 dB.

[0064] In some embodiments, by adjusting the elastic coefficient of the elastic element 1550 and the mass of the additional element 1540, the resonance peak within the target frequency range can be positioned within a specific frequency range. Thereby, the acoustic output device 1500 reduces the frequency range that affects the acoustic output device 400 of the additional element 440, has a flat frequency response curve within a wide frequency band, and thereby outputs good sound quality. At the same time, it can be guaranteed that the sensitivity of the acoustic output device 1500 is not affected by the additional element 1540 within a wide frequency band. Specifically, refer to FIG. 16.

[0065] FIG. 16 is a frequency response curve diagram of an acoustic output device according to some embodiments of the present specification.

[0066] FIG. 16 shows the frequency response curves of the acoustic output device 1500 when the elastic element 1550 has different elastic coefficients and the additional element 1540 has different masses. Here, the horizontal axis is the frequency (Hz), the vertical axis is the corresponding sound pressure (dB) at different frequencies of the acoustic output device, the curve L161 is the frequency response curve of the acoustic output device 1500 when the elastic coefficient of the elastic element 1550 is 8800 N / m and the mass of the additional element 1540 is 2 g, and the curve L162 is the frequency response curve of the acoustic output device 1500 when the elastic coefficient of the elastic element 1550 is 16500 N / m and the mass of the additional element 1540 is 2 g. The curve L163 is the frequency response curve of the acoustic output device 1500 when the elastic coefficient of the elastic element 1550 is 16500 N / m and the mass of the additional element 1540 is 0.3 g. The resonance peaks in the region E are the resonance peaks within the target frequency range generated by driving the elastic element 1550 to vibrate the additional element 1540 with respect to the panel 1521. The resonance dips in the region F are the resonance dips within the target frequency range generated by driving the elastic element 1550 to vibrate the additional element 1540 with respect to the panel 1521. As can be seen from the curves L161 and L162, as the elastic coefficient of the elastic element 1550 increases, the resonance frequency corresponding to the resonance peak increases, and the frequency range in which the sensitivity of the acoustic output device 1500 is not affected by the additional element 1540 becomes narrower. As can be seen from the curves L162 and L163, as the mass of the additional element 1540 increases, the resonance frequency corresponding to the resonance peak decreases, and the frequency range in which the sensitivity of the acoustic output device 1500 is not affected by the additional element 1540 becomes wider. In some embodiments, by adjusting the elastic coefficient of the elastic element 1550 and / or the mass of the additional element 1540 so that the resonance frequency is within the target frequency range, the frequency range in which the sensitivity of the acoustic output device 1500 is not affected by the additional element 1540 can be widened. In some embodiments, the target frequency range may be 700 Hz or less. Preferably, the target frequency range may be 500 Hz or less. More preferably, the target frequency range may be 400 Hz or less. Even more preferably, the target frequency range may be 300 Hz or less. Even more preferably, the target frequency range may be 200 Hz or less.

[0067] In the acoustic output device 1500, when the magnetic circuit assembly 1511 and the panel 1521 are connected by the vibration transmission sheet 1513A, there is a possibility that the magnetic circuit assembly 1511 and the additional element 1540 attract or repel each other, causing the magnetic circuit assembly to reverse and deform, which may affect the vibration stability of the transducer device 1510. In order to avoid the magnetic circuit assembly 1511 and the additional element 1540 attracting or repelling each other and causing the magnetic circuit assembly 1511 to reverse and deform, thereby affecting the vibration stability of the transducer device 1510, in some embodiments, the connection between the magnetic circuit assembly 1511 and the panel 1521 by the vibration transmission sheet 1513A may be replaced by the vibration transmission sheet 1513B (shown by the dashed line in FIG. 15). As an exemplary explanation, the vibration transmission sheet 1513B is located between the magnetic circuit assembly 1511 and the side wall of the housing 1522 facing the panel 1521. One side of the vibration transmission sheet 1513B may be connected to the side away from the panel 1521 of the magnetic circuit assembly 1511, and the peripheral side of the vibration transmission sheet 1513B may be connected to the side wall (housing body 1522) adjacent to the panel 1521 of the housing 1522. Here, the vibration transmission sheet 1513B is located between the magnetic circuit assembly 1511 and the side wall of the housing 1522 facing the panel 1521, and the vibration transmission sheet 1513B can improve the support effect on the position close to the additional element 1540 of the magnetic circuit assembly 1511, and can improve the vibration stability of the transducer device, particularly the magnetic circuit assembly 1511. In some embodiments, in order to further improve the vibration stability of the transducer device 1510, the acoustic output device 1500 may include the vibration transmission sheet 1513A and the vibration transmission sheet 1513B simultaneously.

[0068] FIG. 17 is a schematic configuration diagram of an acoustic output device according to some embodiments of the present specification.

[0069] As shown in FIG. 17, structures such as the transducer device 1710 (including the magnetic circuit assembly 1711, the coil 1712, and the vibration transmission sheet 1713A) in the acoustic output device 1700, the panel 1721 in the case 1720, the support structure 1730, and the additional element 1740 may be similar to the structures such as the transducer device 1510 (including the magnetic circuit assembly 1511, the coil 1512, and the vibration transmission sheet 1513A) in the acoustic output device 1500 shown in FIG. 15, the panel 1521 in the case 1520, the support structure 1530, and the additional element 1540, and will not be further described here. The difference between the acoustic output device 1700 and the acoustic output device 200 is that the additional element 1740 is installed independently of the housing 1722, and the additional element 1740 is connected to the housing 1722 by the elastic element 1750. In some embodiments, the additional element 1740 may be installed independently outside the housing 1722. In some embodiments, as shown in FIG. 17, the additional element 1740 may be installed independently inside the housing 1722. In some embodiments, the elastic element 1750 may be a leaf spring structure, and one end of the leaf spring structure may be connected to the additional element 1740, and the other end may be connected to the side wall (the housing body 17222 and / or the back plate 17221) of the housing 1722. In some embodiments, the elastic element 1750 may be an elastic ring structure. By way of example, the additional element 1740 may be located inside the housing 1722 and installed independently of the housing 1722. The inner contour of the ring structure may be connected to the circumferential side of the additional element 1740, and the outer contour of the ring structure may be connected to the inner wall of the housing body 17222. Here, the additional element 1740 may be a battery, a circuit board, or a sensor insensitive to the vibration direction (for example, a temperature sensor and a humidity sensor).

[0070] In the audio output device 1700, when the magnetic circuit assembly 1711 and the panel 1721 are connected by the vibration transmission sheet 1713A, there may be a problem that the magnetic circuit assembly 1711 and the additional element 1740 attract or repel each other, causing the magnetic circuit assembly to invert and deform, which may affect the vibration stability of the transducer device 1710. In order to avoid the magnetic circuit assembly 1711 and the additional element 1740 attracting or repelling each other and causing the magnetic circuit assembly 1711 to invert and deform, which may affect the vibration stability of the transducer device 1710, in some embodiments, the vibration transmission sheet 1713A between the magnetic circuit assembly 1711 and the panel 1721 may be replaced with a vibration transmission sheet 1713B (shown by a dashed line in FIG. 17). As an exemplary explanation, the vibration transmission sheet 1713B is located between the magnetic circuit assembly 1711 and the side wall of the housing 1722 facing the panel 1721. One side of the vibration transmission sheet 1713B may be connected to the side away from the panel 1721 of the magnetic circuit assembly 1711, and the peripheral side of the vibration transmission sheet 1713B may be connected to the side wall (housing body 1722) adjacent to the panel 1721 of the housing 1722. Here, the vibration transmission sheet 1713B is located between the magnetic circuit assembly 1711 and the side wall of the housing 1722 facing the panel 1721. The vibration transmission sheet 1713B can improve the support effect on the position close to the additional element 1740 of the magnetic circuit assembly 1711, and can improve the vibration stability of the transducer device, especially the magnetic circuit assembly 1711. In some embodiments, in order to further improve the vibration stability of the transducer device 1710, the audio output device 1700 may include the vibration transmission sheet 1713A and the vibration transmission sheet 1713B simultaneously.

[0071] FIGS. 18 and 19 are schematic configuration diagrams of an audio output device according to some embodiments of the present specification.

[0072] In some embodiments, as shown in FIG. 18, the additional element 1740 in the acoustic output device 1800 may be elastically connected to the panel 1721 by the elastic element 1750. In some embodiments, as shown in FIG. 19, the additional element 1740 in the acoustic output device 1900 may be elastically connected to the transducer device 1710 by the elastic element 1750. Note that the additional element 1740 shown in FIGS. 18 and 19 may be a battery, a circuit board, or a sensor insensitive to the vibration direction (for example, a temperature sensor and a humidity sensor). Note that the additional element 1740 may be directly adhered to the housing 1722 by an adhesive. For example, the additional element 1740 may be adhered to the housing body 17222 by an adhesive. The solidified adhesive has a certain elasticity and can perform the same function as the elastic element 1750. In some embodiments, the adhesive includes, but is not limited to, a gel-based, silicone gel, acrylic acid-based, polyurethane-based, rubber-based, epoxy-based, hot melt-based, photocurable-based, etc. Preferably, it may be a silicone adhesive or a silicone adhesive.

[0073] FIG. 20 is a schematic configuration diagram of an acoustic output device according to some embodiments of the present specification.

[0074] As shown in FIG. 20, the acoustic output device 2000 may include a transducer device 2010, a case 2020, a support structure 2030, and an additional element 2040. The case 2020 may include a panel 2021, a housing 2022, and a support member 2023. In some embodiments, the housing 2022 may include a back plate 20221 and a housing body 20222 (shown by a dashed line in the figure). In some embodiments, the housing body 20222 may be a columnar structure with a hollow interior and open-ended openings at both ends, and the panel 2021 and the back plate 20221 may be located at both ends having the open-ended openings of the housing body 20222, respectively, and a rigid connection is realized by the housing body 20222. In some embodiments, the housing 2022 may be an integral structure. For example, the housing 2022 may be a structure with a hollow interior and an open-ended opening at one end, and the panel 2021 may be located at the end having the open-ended opening of the housing 2022. In some embodiments, the support member 2023 may be installed independently outside the housing 2022 or may be installed independently inside the housing 2022. In some embodiments, the support member 2023 may be a cylindrical structure, and the cylindrical structure may be provided around a side wall (also called the housing body 20222 or a connecting member) adjacent to the panel 2021 of the housing 2022. In some embodiments, the housing body 20222 may be a columnar body structure having openings at both ends, and the cylindrical structure may be provided around the housing body 20222. In some embodiments, the support member 2023 may be installed independently of the housing 2022, the panel 2021 may be rigidly connected to the housing 2022, the additional element 2040 may be rigidly connected to the support member 2023, and the support member 2023 may be connected to the housing 2022 or the panel 2021 by an elastic element 2050, thereby realizing the connection of the elastic element 2050 in the vibration path where the additional element 2040 and the panel 2021 are connected.Structures such as the transducer device 2010 (including the magnetic circuit assembly 2011, the coil 2012, and the vibration transmission sheet 2013A), the support structure 2030, and the additional element 2040 in the audio output device 2000 may be similar to the structures such as the transducer device 10 (including the magnetic circuit assembly 11, the coil 12, and the vibration transmission sheet 13), the support structure 30, and the additional element 40 in the audio output device 200, and will not be further described here.

[0075] In some embodiments, the magnetic circuit assembly 2011 may include a hole 20111 and a positioning rod 20112. The hole 20111 may penetrate the magnetic circuit assembly 2011 along the vibration direction (the first direction shown in FIG. 20) of the transducer device 2010. One end of the positioning rod 20112 away from the panel 2021 is connected to the back plate 20221 opposite to the position of the panel 2021 in the housing 2022, and the other end penetrates the hole 20111 and is connected to the panel 2021. Note that the positioning rod 20112 may function to fix the panel 2021 and the back plate 20221. In this case, the housing body 20222 may not be installed, or the panel 2021 and the back plate 20221 may not be fixedly connected to the housing body 20222. In some embodiments, the positioning rod 20112 and the housing body 20222 may be installed simultaneously. For more descriptions regarding the hole 20111 and the positioning rod 20112, reference may be made to the related descriptions of the hole 12111 and the positioning rod 12112 shown in FIG. 12, which will not be described here.

[0076] In some embodiments, the elastic element 2050 may include a first elastic element 2051 and a second elastic element 2052. One end of the support member 2023 may be connected to the panel 2021 by the first elastic element 2051, and the other end of the support member 2023 may be connected to a side wall (or a back plate 20221) of the housing 2022 opposite to the position of the panel 2021 by the second elastic element. By installing in this way, a resonance system is formed between the first elastic element 2051 and the second elastic element 2052, the support member 2023 and the additional element 2040 attached thereto, the panel 2021, the housing 2022, and a structure (such as the coil 2012, the support structure 2030, etc.) rigidly connected to the panel 2021 or the housing 2022. Note that when other structures are rigidly connected to the panel 2021 or the housing 2022, and other structures are rigidly connected to the support member 2023, these structures are also regarded as part of the resonance system. The resonance system can generate resonance peaks and resonance dips in the target frequency range. In a frequency range greater than the resonance frequency corresponding to the resonance peak, the vibration transmission between the additional element 2040 and the panel 2021 is suppressed, that is, the influence of the additional element 2040 on the vibration of the panel 2021 is reduced, thereby ensuring that its sensitivity is not affected or hardly affected by the additional element 2040 in a frequency range greater than the resonance frequency corresponding to the resonance peak. In some embodiments, by setting the resonance frequency corresponding to the resonance peak at a relatively low frequency position, the frequency range in which the sensitivity of the acoustic output device 2000 is reduced by the additional element 2040 can be reduced. Also, in a frequency range greater than the resonance frequency corresponding to the resonance peak, the influence of the additional element 2040 on the vibration of the panel 2021 is relatively small, and the frequency response curve of the acoustic output device 2000 is flatter, so it can be guaranteed that the acoustic output device 400 has a good acoustic output effect in a wide frequency range, and the user's auditory experience can be improved.Moreover, by installing the first elastic element 2051, the second elastic element 2052, and the support member 2023, the additional element 2040 can be stably supported, the shaking of the additional element 2040 can be reduced, and the influence on the sensitivity of the acoustic output device 200 can be avoided. In some embodiments, only the first elastic element 2051 or the second elastic element 2052 may be installed.

[0077] In some embodiments, the housing body 20222 may have a plate-like structure or a rod-like structure, and both ends of the housing body 20222 are rigidly connected to the panel 2021 and the back plate 20221, respectively. For example, the housing body 20222 may have two plate-like structures, and both ends of the two plate-like structures are rigidly connected to the panel 2021 and the back plate 20221, respectively.

[0078] FIG. 21 is a frequency response curve diagram of an acoustic output device according to some embodiments of the present specification.

[0079] As shown in FIG. 21, the horizontal axis represents frequency (Hz), the vertical axis represents the corresponding sound pressure (dB) at different frequencies of the acoustic output device, the curve L211 is the frequency response curve when the mass of the additional element 2040 in the acoustic output device 2000 is 0 (which corresponds to the acoustic output device 2000 not including the additional element 2040), and in the frequency range of 200 Hz to 2000 Hz, it has a resonance peak 2111 and a resonance dip 2112. The curve L212 is the frequency response curve when the additional element 2040 in the acoustic output device 2000 has a certain mass, and in the frequency range of 200 Hz to 2000 Hz, it has a resonance peak 2121 and a resonance dip 2122. As can be seen from the curves L211 and L212, in the frequency range higher than the resonance frequency corresponding to the resonance peak, the acoustic output device 2000 has a relatively flat frequency response curve. In this case, the acoustic output device 2000 can output good sound quality. Also, as can be seen from the fact that the resonance frequency corresponding to the resonance peak 2121 is smaller than the resonance frequency corresponding to the resonance peak 2111, the resonance frequency of the acoustic output device and the mass of the additional element show a negative correlation. That is, as the mass of the additional element 2040 increases, the resonance frequency corresponding to the resonance peak of the acoustic output device 2000 becomes lower (approaches the low frequency). In some embodiments, by adjusting the mass of the additional element 2040 (for example, increasing the mass of the additional element 2040), the acoustic output device 2000 can have a flat frequency response curve in a wider frequency range.

[0080] In some embodiments, as shown in FIG. 20, the first elastic element 2051 and the second elastic element 2052 may have a leaf spring structure. The first elastic element 2051 and the second elastic element 2052 may be respectively located on both sides of the transducer device 2010 along its vibration direction. The side of the first elastic element 2051 facing the panel 2021 may be connected to the panel 2021. The peripheral side of the first elastic element 2051 may be connected to one end of the support member 2023. The side of the second elastic element 2052 away from the transducer device 2010 may be connected to the side wall (back plate 20221) of the housing 2022 facing the position of the panel 2021. In some embodiments, the support structure 2030 may be rigidly connected to the support member 2023, or may be rigidly connected to the panel 2021 or the back plate 20221.

[0081] FIG. 22 is a schematic configuration diagram of an acoustic output device according to some embodiments of the present specification.

[0082] In some embodiments, as shown in FIG. 22, the first elastic element 2051 and the second elastic element 2052 in the acoustic output device 2200 may have an elastic ring structure. The first elastic element 2051 and the second elastic element 2052 may be respectively located at both ends of the support member 2023. One end of the support member 2023 may be connected to the panel by the first elastic element 2051. The other end of the support member 2023 may be connected to the side wall (or back plate 20221) of the housing 2022 facing the position of the panel 2021 by the second elastic element. As an exemplary description, the support member 2023 may be a structure (for example, a sleeve structure) with a hollow interior and open openings at both ends. The inner contour of the ring structure may be connected to the peripheral sides of the panel 2021 and the back plate 20221. The outer contour of the ring structure may be connected to the openings at both ends of the support member 2023. In some embodiments, the ring structure may be made of an elastic material such as silica gel or polyurethane.

[0083] FIG. 23 is a frequency response curve diagram of an acoustic output device according to some embodiments of the present specification.

[0084] As shown in FIG. 23, the horizontal axis is the frequency (Hz), the vertical axis is the corresponding sound pressure (dB) at different frequencies of the acoustic output device, the curve L231 is the frequency response curve of the acoustic output device 2200 when the mass of the additional element 2040 is 2 g, and the curve L232 is the frequency response curve of the acoustic output device 2200 when the mass of the additional element 2040 is 3.5 g. As can be seen from the curves L231 and L232, the portions within the frequency range of 1000 Hz to 5000 Hz of the curve L231 and the portions within the frequency range of 1000 Hz to 5000 Hz of the curve L232 are relatively flat and substantially overlap. Thus, it can be seen that in the frequency range of 1000 Hz to 5000 Hz, the sensitivity of the acoustic output device 2200 is not affected by the mass of the additional element 2040.

[0085] In some embodiments, the first elastic element 2051 and the second elastic element 2052 may be an adhesive having elasticity. The first elastic element 2051 can bond one end of the support member 2023 to the panel 2021, and the second elastic element 2052 can bond the other end of the support member 2023 to the back plate 20221. In some embodiments, the adhesive includes, but is not limited to, a gel-based, silicone gel, acrylic acid-based, polyurethane-based, rubber-based, epoxy-based, hot melt-based, photocurable-based, etc., and preferably, it may be a silicone adhesive or a silicone adhesive.

[0086] FIG. 24 is a schematic configuration diagram of an acoustic output device according to some embodiments of the present specification. As shown in FIG. 24, in some embodiments, the support member 2023 in the acoustic output device 2400 may have a plate-like structure, and the plate-like structure may be installed independently of the housing 2022. The additional element 2040 may be rigidly connected to the plate-like structure. One end of the plate-like structure may be connected to the panel 2021 by the first elastic element 2051, and the other end of the plate-like structure may be connected to the side wall (rear plate 20221) facing the position of the panel 2021 in the housing 2022 by the second elastic element 2052. In some embodiments, as shown in FIG. 24, the first elastic element 2051 and the second elastic element 2052 in the acoustic output device 2400 may have a leaf spring structure. As an exemplary explanation, when the support member 2023 is installed independently outside the housing 2022, a first gap 20223 and a second gap 20224 through which the leaf spring structure penetrates may be formed in the side wall of the housing body 20222 facing the support member 2023. The side of the first elastic element 2051 close to the panel 2021 may be connected to the panel 2021, the peripheral side of the first elastic element 2051 located inside the housing 2022 may be connected to another side wall of the housing body 20222, and the other peripheral side of the first elastic element 2051 may be connected to one end of the support member 2023 through the first gap 20223. The side of the second elastic element 2052 away from the transducer device 2010 may be connected to the rear plate 20221, the peripheral side of the second elastic element 2052 located inside the housing 2022 may be connected to another side wall of the housing body 20222, and the other peripheral side of the second elastic element 2052 may be connected to the other end of the support member 2023 through the second gap 20224. In some embodiments, when the support member 2023 is installed independently inside the housing 2022, the first gap 20223 and the second gap 20224 through which the leaf spring structure penetrates may not be provided in the side wall of the housing body 20222 facing the support member 2023.In other embodiments, a notch for arranging the support member 2023 may be provided in the housing body 20222. The support member 2023 may be elastically connected to the housing 2022 or the panel 2021 by the first elastic element 2051 and the second elastic element 2052, and may be connected to the housing body 20222 by an elastic element or an adhesive. For example, an elastic element (such as a leaf spring or an elastic ring structure) may be installed on the peripheral side of the support member 2023, and the support member 2023 and the housing body 20222 are elastically connected by the elastic element. Also, for example, the peripheral side of the support member 2023 and the housing body 20222 may be adhered by an adhesive, and the cured adhesive becomes an elastic element.

[0087] FIG. 25 is a schematic configuration diagram of an acoustic output device according to some embodiments of the present specification.

[0088] As shown in FIG. 25, in some embodiments, the support member 2023 in the acoustic output device 2500 may have a plate-like structure, and the first elastic element 2051 and the second elastic element 2052 may be a spring having elasticity, a leaf spring, a film structure, or the like. As an exemplary explanation, the first elastic element 2051 and the second elastic element 2052 are respectively located at both ends of the plate-like structure. One end of the plate-like structure is connected to the panel 2021 by the first elastic element 2051, and the other end of the plate-like structure is connected to the back plate 20221 by the second elastic element 2052. In other embodiments, a notch for arranging the support member 2023 may be provided in the housing body 20222. The support member 2023 may be elastically connected to the housing 2022 or the panel 2021 by the first elastic element 2051 and the second elastic element 2052, and may be connected to the housing body 20222 by an elastic element or an adhesive. For example, an elastic element (such as a leaf spring or an elastic ring structure) may be installed on the peripheral side of the support member 2023, and the support member 2023 and the housing body 20222 are elastically connected by the elastic element. Also, for example, the peripheral side of the support member 2023 and the housing body 20222 may be adhered by an adhesive, and the cured adhesive becomes an elastic element.

[0089] FIG. 26 is a schematic configuration diagram of an acoustic output device according to some embodiments of the present specification. As shown in FIG. 26, in some embodiments, the support member 2023 in the acoustic output device 2600 may have a cylindrical structure, and the cylindrical structure may be externally fitted outside the housing main body 20222. The additional element 2040 is rigidly connected to the cylindrical structure. One end of the cylindrical structure may be connected to the panel 2021 by the first elastic element 2051, and the other end of the cylindrical structure may be connected to the back plate 20221 by the second elastic element 2052. In some embodiments, as shown in FIG. 26, the first elastic element 2051 and the second elastic element 2052 in the acoustic output device 2600 may have a leaf spring structure. As an exemplary explanation, when the cylindrical structure is externally fitted outside the housing main body 20222, a first gap 20223 and a second gap 20224 through which the leaf spring structure passes may be formed in the housing main body 20222. The side of the first elastic element 2051 close to the panel 2021 may be connected to the panel 2021, the peripheral side of the first elastic element 2051 may pass through the first gap 20223 and be connected to one end of the support member 2023, the side of the second elastic element 2052 away from the transducer device 2010 may be connected to the back plate 20221, and the peripheral side of the second elastic element 2052 may pass through the second gap 20224 and be connected to the other end of the support member 2023. In some embodiments, when the sleeve structure is located inside the housing 2022, the first gap 20223 and the second gap 20224 through which the leaf spring structure passes may not be provided in the housing main body 20222.

[0090] FIG. 27 is a schematic configuration diagram of an acoustic output device according to some embodiments of the present specification. As shown in FIG. 27, in some embodiments, the support member 2023 in the acoustic output device 2700 may have a cylindrical structure, and the first elastic element 2051 and the second elastic element 2052 may have an elastic ring structure. As an exemplary explanation, the first elastic element 2051 and the second elastic element 2052 are respectively located at both ends of the cylindrical structure. The inner contour of the first elastic element 2051 may be connected to the peripheral side of the panel 2021, the outer contour of the first elastic element 2051 may be connected to one end of the cylindrical structure, the inner contour of the second elastic element 2052 may be connected to the peripheral side of the back plate 20221, and the outer contour of the second elastic element 2052 may be connected to the other end of the cylindrical structure.

[0091] In some embodiments, the outer sidewalls of the panel 2021 or the housing 2022 in the acoustic output device 2700 may be covered with a vibration transmission layer. The vibration transmission layer may be used to contact the user's skin, that is, the outer sidewalls of the panel 2021 or the housing may contact the user's skin through the vibration transmission layer. In some embodiments, the Shore hardness of the vibration transmission layer may be smaller than the Shore hardness of the outer sidewalls of the panel 2021 or the housing 2022, that is, the vibration transmission layer may be softer than the outer sidewalls of the panel 2021 or the housing 2022. In some embodiments, the material of the vibration transmission layer is a soft material such as silica gel, and the material of the outer sidewalls of the panel 2021 or the housing 2022 is a hard material such as polycarbonate or glass fiber reinforced plastic. In this way, the wearing comfort of the acoustic output device 2700 is improved, the acoustic output device 2700 is fitted to the user's skin, and the sound quality of the acoustic output device 2700 is improved. In some embodiments, the vibration transmission layer may be removably connected to the outer sidewalls of the panel 2021 or the housing 2022 so that the user can easily replace it. Note that covering the outer sidewalls of the panel or the housing with a vibration transmission layer is applicable not only to the acoustic output device 2700, but also to the acoustic output devices in other embodiments of this specification, for example, the acoustic output device 400 shown in FIG. 4, the acoustic output device 700 shown in FIG. 7, the acoustic output device 900 shown in FIG. 9, the acoustic output device 1200 shown in FIG. 12, the acoustic output device 1300 shown in FIG. 13, the acoustic output device 1500 shown in FIG. 15, and the like.

[0092] In the audio output devices 2000, 2200, 2400, 2500, 2600, and 2700, when the magnetic circuit assembly 2011 and the panel 2021 are connected by the vibration transmission sheet 2013A, there may be a problem that the magnetic circuit assembly 2011 and the additional element 2040 attract or repel each other, causing the magnetic circuit assembly to be reversibly deformed and affecting the vibration stability of the transducer device 2010. To avoid the magnetic circuit assembly 2011 and the additional element 2040 attracting or repelling each other and causing the magnetic circuit assembly 2011 to be reversibly deformed and affecting the vibration stability of the transducer device 2010, in some embodiments, the vibration transmission sheet 2013A between the magnetic circuit assembly 2011 and the panel 2021 may be replaced with a vibration transmission sheet 2013B (shown by a dashed line in FIGS. 20, 22, 24, 25, 26, and 27). Alternatively, in some embodiments of the present application, the audio output devices 2000, 2200, 2400, 2500, 2600, and 2700 may simultaneously include the vibration transmission sheet 2013A and the vibration transmission sheet 2013B. By supporting the magnetic circuit assembly 2011 with the vibration transmission sheet 2013A and the vibration transmission sheet 2013B, it is ensured that the vibration of the transducer device 2010 is more stable. In some embodiments, the vibration transmission sheet 2013A and the vibration transmission sheet 2013B may include a central region and a plurality of support rods. The plurality of support rods are distributed at intervals along the peripheral side of the central region. The central region is connected to the side of the magnetic circuit assembly away from the panel, and the end of the support rod away from the central region is connected to the housing. By way of merely illustrative explanation, the number of support rods may be four. In this case, the structure of the vibration transmission sheet 2013A and the vibration transmission sheet 2013B can be approximately regarded as an "X" - shaped structure. The "X" - shaped structure can provide elasticity in the vibration direction of the transducer device. Also, the plurality of support rods have high structural strength in a direction perpendicular to the vibration direction of the transducer device, and can provide a high support effect on the magnetic circuit assembly 2011, thereby avoiding the transducer device from being reversibly deformed during its vibration.In some embodiments, the vibration transmission sheets 2013A and 2013B may further include an edge region, the edge region is connected to an end away from the central region of the support rod, and the peripheral side of the edge region may be connected to the housing. For the specific structure of the vibration transmission sheet, reference can be made to the content in other parts of the specification of this application, for example, FIGS. 46 and 47 and their related descriptions.

[0093] As an exemplary illustration, as shown in FIGS. 24 and 25, the support member 2023 may have a plate-like structure, and the vibration transmission sheet 2013B is located between the magnetic circuit assembly 2011 and the side wall (i.e., the back plate 20221) facing the panel 2021 of the housing 2022. One side of the vibration transmission sheet 2013B may be connected to the side away from the panel 2021 of the magnetic circuit assembly 2011, and the vibration transmission sheet 2013B may be connected to the housing body 20222 by its peripheral side. As shown in FIGS. 26 and 27, when the support member 2032 has a cylindrical structure, one side of the vibration transmission sheet 2013B may be connected to the side away from the panel 2021 of the magnetic circuit assembly 2011, and the peripheral side of the vibration transmission sheet 2013B may be connected to the housing body 20222. Here, by positioning the vibration transmission sheet 2013B between the magnetic circuit assembly 2011 and the side wall facing the panel 2021 in the housing 2022 and connecting the side wall where the vibration transmission sheet 2013B and the additional element 2040 are installed, the vibration transmission sheet 2013B can provide support in the relative movement direction between the magnetic circuit assembly 2011 and the additional element 2040. The vibration transmission sheet 2013B can improve the support effect on the position close to the additional element 2040 of the magnetic circuit assembly 2011 and improve the vibration stability of the transducer device, especially the magnetic circuit assembly 2011. To further improve the vibration stability of the transducer device 2010, the acoustic output devices 2000, 2200, 2400, 2500, 2600 or 2700 may simultaneously include the vibration transmission sheet 2013A and the vibration transmission sheet 2013B.

[0094] Note that both ends of the support member 2023 shown in FIGS. 20 and 22 may be rigidly connected to the panel 2021 and the back plate 20221 respectively, and the additional element 2040 may be adhered to the support member 2023 by an adhesive. The solidified adhesive has a certain elasticity and can perform the same function as the elastic element 2050. In some embodiments, the adhesive includes, but is not limited to, gel-based, silicone gel, acrylic acid-based, polyurethane-based, rubber-based, epoxy-based, hot melt-based, photocuring-based, etc. Preferably, it may be a silicone adhesive or a silicone adhesive.

[0095] In the acoustic output device according to the embodiments of the present specification, the additional element is connected to the panel by a vibration path including at least an elastic element, and the problem of reducing the sensitivity by adding an additional element to the bone conduction acoustic output device can be solved. However, when the additional element installed in the bone conduction speaker is an air conduction speaker, there is also a possibility that the sound leakage of the acoustic output device increases. Specifically, when the additional element is an air conduction speaker, the mechanical vibration generated by the transducer device drives the vibration film in the air conduction speaker to vibrate, so the sound leakage generated by the acoustic output device is not only the vibration of the external air of the acoustic output device by the housing, but also the vibration generated by the vibration film in the air conduction speaker due to the vibration of the transducer device, thereby increasing the sound leakage of the entire speaker and degrading the user's auditory experience. Hereinafter, the influence of the additional element 40 being an air conduction speaker on the sound leakage of the acoustic output device will be described in detail by combining the bone conduction acoustic output device 100 and the sound leakage frequency response curve of the acoustic output device 200 when the additional element 40 is an air conduction speaker.

[0096] FIG. 28 is a sound leakage frequency response curve diagram of an acoustic output device according to some embodiments of the present specification. As shown in FIG. 28, the horizontal axis represents frequency (Hz), the vertical axis represents the corresponding sound leakage sound pressure (dB) at different frequencies of the acoustic output device, the curve L281 is the sound leakage frequency response curve measured on the side wall adjacent to the panel 21 in the housing 22 of the bone conduction acoustic output device 100, the curve L282 is the sound leakage frequency response curve measured on the side wall adjacent to the panel 21 in the housing 22 of the acoustic output device 200 when the additional element 40 is an air conduction speaker and the vibration direction of the diaphragm of the air conduction speaker is parallel to the vibration direction of the transducer device 10, and the curve L283 is the sound leakage frequency response curve measured on the side wall adjacent to the panel 21 in the housing 22 of the acoustic output device 200 when the additional element 40 is an air conduction speaker and the vibration direction of the diaphragm of the air conduction speaker is substantially perpendicular to the vibration direction of the transducer device 10. The sound leakage frequency response curves of the acoustic output device 100 and the acoustic output device 200 can be measured by detecting the air conduction sound on the side wall adjacent to the panel 21 of the housing of the acoustic output device 100 and the acoustic output device 200, which is similarly applicable to the collection of the sound leakage frequency response curves of other speakers in the embodiments of the present specification. As can be seen from the curves L281 and L282, when the vibration direction of the diaphragm of the air conduction speaker is parallel to the vibration direction of the transducer device 10, the sound leakage sound pressure in the mid-high frequency band (5000 Hz to 10000 Hz) of the speaker 200 is generally higher than the sound leakage sound pressure of the bone conduction speaker 100. It can be seen from this that when an air conduction speaker is installed on the bone conduction speaker, if the vibration direction of the diaphragm of the air conduction speaker is parallel to the vibration direction of the transducer device, the sound leakage of the acoustic output device will increase. As can be seen from the curves L281, the curve L282, and the curve L283, when the vibration direction of the diaphragm of the air conduction speaker is substantially perpendicular to the vibration direction of the transducer device 10, the sound leakage sound pressure in the mid-high frequency band (500 Hz to 10000 Hz) of the acoustic output device 200 is lower than or the same as the sound leakage sound pressure of the bone conduction acoustic output device 100.As will be understood hereinafter, when an air conduction speaker is installed in a bone conduction speaker, if the vibration direction of the diaphragm of the air conduction speaker is substantially perpendicular to the vibration direction of the transducer device, it is advantageous for reducing sound leakage of the acoustic output device.

[0097] Based on the above problem that installing an air conduction speaker in a bone conduction speaker increases sound leakage of the acoustic output device, embodiments of the present specification provide an acoustic output device, in which the vibration direction of the transducer device in the acoustic output device is substantially perpendicular to the vibration direction of the diaphragm of the air conduction speaker. Here, the substantially perpendicular may be understood as that the included angle between the vibration direction of the transducer device and the vibration direction of the diaphragm of the air conduction speaker is 75° to 100°, which can effectively reduce sound leakage of the acoustic output device and ensure that the user has a good auditory experience. Hereinafter, a specific description will be given with reference to the acoustic output device 400 shown in FIG. 4.

[0098] As shown in FIG. 4, the additional element in the acoustic output device 400 may be an air conduction speaker, and the air conduction speaker may include a diaphragm 441. The diaphragm 441 vibrates by the drive of the transducer device of the air conduction speaker to drive the vibration of air, so that the user can hear air conduction sound. The second direction shown in FIG. 4 may be the vibration direction of the transducer device 410, and the first direction may be the vibration direction of the diaphragm 441. In order to prevent an increase in sound leakage of the acoustic output device 400 caused by the air conduction speaker, in some embodiments, the included angle a between the first direction and the second direction may be 75° to 100°. Preferably, the included angle a between the first direction and the second direction may be 80° to 95°. For example, illustratively, the included angle a between the first direction and the second direction may be 90°.

[0099] As shown in FIG. 4, in some embodiments, the air conduction speaker may be installed on a side wall (also called the housing body) adjacent to the position of the panel 421 in the housing 422.

[0100] FIG. 29 is a schematic configuration diagram of an acoustic output device according to some embodiments of the present specification. As shown in FIG. 29, in some embodiments, the air conduction speaker in the acoustic output device 2900 may be installed on a side wall (or a back plate) facing the position of the panel in the housing 422.

[0101] In addition, when the additional element is an air conduction speaker, forming a certain included angle between the vibration direction of the diaphragm of the air conduction speaker and the vibration direction of the transducer device to reduce the sound leakage of the acoustic output device is applicable not only to the acoustic output device 400, but also to other acoustic output devices according to the embodiments of the present specification, for example, the acoustic output device 700 shown in FIG. 7, the acoustic output device 900 shown in FIG. 9, the acoustic output device 1200 shown in FIG. 12, the acoustic output device 1300 shown in FIG. 13, the acoustic output device 1500 shown in FIG. 15, etc. Further, when the additional element is a device sensitive to a certain vibration direction such as a vibration sensor, an inertial acceleration sensor, a microphone, etc., in order to avoid the operation of these devices being affected by the vibration of the transducer device in the acoustic output device, a certain included angle (for example, 75° to 100°) can be provided between the sensitive vibration direction of these devices and the vibration direction of the transducer device. Also, in some embodiments, the additional element may be other components or structures not sensitive to the vibration direction such as a circuit board, a battery, etc., and may be installed at any position of the housing.

[0102] FIG. 30 is a schematic configuration diagram of an acoustic output device according to some embodiments of the present specification. In order to reduce the overall volume of the acoustic output device 3000, as shown in FIG. 30, an additional element may be installed inside the housing 422. When the additional element is located inside the housing 422, the additional element is rigidly connected to the inside of the side wall adjacent to or facing the position of the panel 421 in the housing 422. In some embodiments, when the additional element is an air conduction speaker, a sound conduction hole (not shown) may be installed in the housing 422, and the sound conduction hole can output the sound generated by the air conduction speaker to the external environment.

[0103] When the magnetic circuit assembly of the transducer device 410 is a magnet and the additional element is an element sensitive to the vibration direction (for example, a pneumatic speaker, a pneumatic microphone, etc.), when the pneumatic speaker is installed in the housing 422 and approaches the transducer device, a problem occurs where the magnetic fields of the pneumatic speaker and the transducer device 410 interfere with each other. Here, taking the pneumatic speaker as an example, as shown in FIG. 31, in some embodiments, along the vibration direction of the diaphragm 441 of the pneumatic speaker, there is a distance d between the pneumatic speaker and the transducer device 410. In some embodiments, the larger the distance d, the smaller the mutual interference of the magnetic fields between the pneumatic speaker and the transducer device 410. In some embodiments, the distance d may be 0.8 mm or more. In some embodiments, the distance d may be 1 mm or more. In some embodiments, the distance d may be 1.2 mm or more.

[0104] To avoid the problem that the magnetic fields of the pneumatic speaker and the transducer device 410 interfere with each other, in some embodiments, a partition member 442 may be provided between the pneumatic speaker and the transducer device 410, and the pneumatic speaker and the transducer device 410 may be located on both sides of the partition member 442, respectively. In some embodiments, the partition member 442 may have a plate-like structure, and the larger the thickness t of the partition member 442, the smaller the mutual interference of the magnetic fields between the pneumatic speaker and the transducer device 410. In some embodiments, the thickness t of the partition member 442 may be 0.8 mm or more. In some embodiments, the thickness t of the partition member 442 may be 1 mm or more. In some embodiments, the thickness t of the partition member 442 may be 1.2 mm or more. In some embodiments, in order to further reduce the overall volume of the acoustic output device 3100, other members (for example, a battery, a circuit board, etc.) in the acoustic output device 3000 may be installed as the partition member 442 between the transducer device 410 and the pneumatic speaker.

[0105] In addition, the air conduction speaker is located inside the housing, the air conduction speaker and the transducer device have a certain distance in the vibration direction of the diaphragm, and / or a partition member is installed between the air conduction speaker and the transducer device. Similarly, this is applicable to the acoustic output devices in other embodiments of this specification, for example, the acoustic output device 700 shown in FIG. 7, the acoustic output device 900 shown in FIG. 9, the acoustic output device 1200 shown in FIG. 12, the acoustic output device 1300 shown in FIG. 13, the acoustic output device 1500 shown in FIG. 15, and the like.

[0106] FIG. 31 is a schematic configuration diagram of an acoustic output device according to some embodiments of this specification. As shown in FIG. 31, when the user wears the acoustic output device 3100, the sound emission port 4401 of the air conduction speaker faces the user's ear canal. By installing it in this way, the air conduction voice output from the air conduction speaker can be directly transmitted into the user's ear canal, and it can be ensured that the voice output from the air conduction speaker has a sufficient volume for the user to hear.

[0107] FIG. 32 is a schematic configuration diagram of an acoustic output device according to some embodiments of the present specification. As shown in FIG. 32, in the acoustic output device 3200, the bone conduction speaker may include a first bone conduction speaker 470 and a second bone conduction speaker 480. The first bone conduction speaker 470 and the second bone conduction speaker 480 may be distributed on both sides of the housing 422. The first bone conduction speaker 470 and the second bone conduction speaker 480 are installed substantially symmetrically with respect to the symmetry axis i of the transducer device 410. In this way, it is possible to avoid the influence on the sound quality of the acoustic output device 3200 caused by the vibration of the acoustic output device 3200 due to the asymmetry of the added mass. In some embodiments, when the user wears the acoustic output device 3200, the sound emission port 4701 of the first bone conduction speaker 470 may face the user's ear canal, and the sound emission port 4801 of the second bone conduction speaker 480 may be away from the user's ear canal. By installing in this way, it is ensured that the bone conduction voice output from the first bone conduction speaker 470 is directly transmitted into the user's ear canal, and it is avoided that the voice output from the second bone conduction speaker 480 interferes with the bone conduction voice output from the first bone conduction speaker 470. Thereby, the voice output from the first bone conduction speaker 470 has a sufficient volume for the user to hear. In some embodiments, the phases of the sound waves output from the first bone conduction speaker 470 and the sound waves output from the second bone conduction speaker 480 may satisfy specific conditions (for example, the phases are opposite or substantially opposite). The sound waves output from the sound emission port 4701 of the first bone conduction speaker 470 and the sound waves output from the sound emission port 4801 of the second bone conduction speaker 480 may be regarded as substantially two point sound sources. At a position away from the ear canal opening of the human body, the sound waves output from the second bone conduction speaker 480 may be canceled out in the opposite phase to the sound waves output from the first bone conduction speaker 470, thereby reducing the sound leakage volume in the far field of the acoustic output device 400. In some embodiments, instead of the second bone conduction speaker 480, other additional elements such as a battery, a circuit board, and a sensor may be used. These additional elements and the first bone conduction speaker 470 may be installed substantially symmetrically with respect to the symmetry axis of the transducer device 410.

[0108] Note that the fact that the bone conduction speaker includes the first bone conduction speaker 470 and the second bone conduction speaker 480 is similarly applicable to the acoustic output devices in other embodiments of this specification, for example, the acoustic output device 700 shown in FIG. 7, the acoustic output device 900 shown in FIG. 9, the acoustic output device 1200 shown in FIG. 12, the acoustic output device 1300 shown in FIG. 13, the acoustic output device 1500 shown in FIG. 15, and the like.

[0109] As shown in FIG. 5, the acoustic output device 400 can have a flat frequency response curve within the mid- to high-frequency band (within a frequency range higher than the resonant frequency corresponding to the resonant peak), that is, the mid- to high-frequency bone-conducted voice output from the acoustic output device 400 can have good sound quality. Therefore, in order to ensure that the acoustic output device 400 has a good acoustic output effect within the entire frequency band, the additional element in the acoustic output device 400 may be an air-conducted voice output device, and the low-frequency voice may be output from an air-conducted speaker. Further, the acoustic output device 400 may further include a frequency division module, and the frequency division module can perform frequency division processing on the initial electrical signal based on the crossover frequency to generate a mid- to high-frequency signal and a low-frequency signal. An electrical signal smaller than the frequency corresponding to the crossover frequency is a low-frequency signal, and an electrical signal higher than the frequency corresponding to the crossover frequency is a mid- to high-frequency signal. In some embodiments, the crossover frequency may be in the range of 200 Hz to 800 Hz. Preferably, the crossover frequency may be 200 Hz to 700 Hz. More preferably, the crossover frequency may be 200 Hz to 600 Hz. Even more preferably, the crossover frequency may be 300 Hz to 500 Hz. The transducer device 410 in the acoustic output device 400 can output bone-conducted voice based on the mid- to high-frequency signal, and the air-conducted speaker can output air-conducted voice based on the low-frequency signal. Further, the transducer device 410 can generate mid- to high-frequency vibrations based on the electrical signal to drive the mid- to high-frequency vibrations of the panel 421. By fitting to the user, the panel 421 can transmit the mid- to high-frequency vibrations to the user's auditory nerve through the bone conduction path, allowing the user to hear the mid- to high-frequency bone-conducted voice. The transducer device of the air-conducted speaker can be driven to vibrate the diaphragm 441 based on the low-frequency signal, and the diaphragm 441 can drive the vibration of the air to allow the user to hear the low-frequency air-conducted voice. With the low-frequency air-conducted voice and the mid- to high-frequency bone-conducted voice, the acoustic output device 400 has a good acoustic output effect in the entire frequency band.In some embodiments, the frequency corresponding to the crossover frequency is greater than or equal to the maximum value within the target frequency range. In some embodiments, the frequency corresponding to the crossover frequency is greater than or equal to the resonance frequency corresponding to the resonance peak within the target frequency range. When the crossover frequency is greater than the resonance frequency, the influence on the sensitivity of the bone conduction speaker of the additional element (air conduction speaker) is very small, and the bone conduction speaker can have a good acoustic output effect in the mid-high frequency band. At the same time, the air conduction speaker can compensate for the drawback that the output effect of the bone conduction speaker at low frequencies is low by outputting air conduction voice based on the low frequency signal. In some embodiments, in order for the bone conduction speaker to have high sensitivity in the voice generation frequency band, the difference between the crossover frequency and the resonance frequency may be 100 Hz or more. Preferably, the difference between the crossover frequency and the resonance frequency may be 200 Hz or more. In some embodiments, the voices output from the bone conduction speaker and the air conduction speaker may have an overlapping portion in the frequency domain, and the frequency domain of the overlapping portion may cover the resonance frequency corresponding to the resonance peak within the above target frequency range. At this time, the introduction of the additional element reduces the sensitivity of the bone conduction speaker near the resonance frequency, but the air conduction voice emitted by the air conduction voice output device near the resonance frequency can compensate for the drawback that the sensitivity of the bone conduction speaker is not high. With the combination of bone conduction voice and air conduction voice, the user can still clearly hear the voice near the resonance frequency.

[0110] Note that the frequency division module is similarly applicable to the acoustic output devices in other embodiments of this specification, such as the acoustic output device 700 shown in FIG. 7, the acoustic output device 900 shown in FIG. 9, the acoustic output device 1200 shown in FIG. 12, the acoustic output device 1300 shown in FIG. 13, the acoustic output device 1500 shown in FIG. 15, and the like.

[0111] An additional element is installed on the bone conduction speaker, resulting in a decrease in the sensitivity of the acoustic output device. In response to the problem that the magnetic circuit assembly in the transducer device undergoes suction or repulsion by the additional element and is reversely deformed, reducing the vibration stability of the transducer device, the embodiments of this specification further provide an acoustic output device. In some embodiments, the acoustic output device may include a transducer device, a case, and an additional element. The transducer device can generate mechanical vibrations based on an electrical signal. The transducer device includes a magnetic circuit assembly, a coil, and a vibration transmission sheet. The case is used to house the transducer device and includes a panel and a housing. The transducer device transmits mechanical vibrations to the user through the panel. In the acoustic output device according to the embodiments of this specification, the vibration transmission sheet has elasticity. The magnetic circuit assembly is elastically connected to the case by the vibration transmission sheet. The additional element is connected to the magnetic circuit assembly to maintain an elastic connection with the panel. For example, the magnetic circuit assembly may be elastically connected to the panel by the vibration transmission sheet so that it can maintain an elastic connection with the panel when the additional element is connected to the magnetic circuit assembly. Also, for example, the magnetic circuit assembly may be connected to the side wall (or the back plate) facing the position of the panel of the housing by the vibration transmission sheet. Further, for example, the number of vibration transmission sheets may be plural. The plural vibration transmission sheets include a first vibration transmission sheet and a second vibration transmission sheet. The magnetic circuit assembly may be connected to the panel and the back plate by the first vibration transmission sheet and the second vibration transmission sheet respectively, thereby enabling it to maintain an elastic connection with the panel when the additional element is connected to the magnetic circuit assembly. The connection between the additional element and the magnetic circuit assembly may be a direct connection or an indirect connection. For example, the additional element may be directly and rigidly connected to the magnetic circuit assembly. Also, for example, both the additional element and the magnetic circuit assembly are rigidly connected to the housing. Further, for example, the acoustic output device further includes a support member. The additional element is rigidly connected to the support member, and the support member is rigidly connected to the magnetic circuit assembly.In the acoustic output device according to the embodiment of the present specification, by connecting the additional element to the magnetic circuit assembly, it is possible to avoid the additional element and the magnetic circuit assembly attracting or repelling each other, causing the magnetic circuit assembly to reverse and deform, and affecting the vibration stability of the transducer device. In the acoustic output device according to the embodiment of the present specification, the additional element and the magnetic circuit assembly can vibrate relative to the panel to generate a resonance peak within the target frequency, and it can be guaranteed that the sensitivity of the acoustic output device is not affected by the additional element in a frequency range higher than the resonance frequency corresponding to the resonance peak. Thereby, the sensitivity within the frequency band range higher than the resonance frequency of the acoustic output device having the additional element is not affected by the additional element, and the problem of the decrease in the sensitivity of the bone conduction acoustic output device due to adding the additional element to the bone conduction speaker can be avoided. Also, in the acoustic output device according to the embodiment of the present specification, in a frequency range higher than the resonance frequency corresponding to the resonance peak, the frequency response curve of the acoustic output device is relatively flat, guaranteeing that the acoustic output device has a good acoustic output effect and improving the user's auditory experience. Furthermore, when the transducer device generates mechanical vibrations at a low frequency (a frequency range lower than the resonance frequency corresponding to the resonance peak), the low-frequency vibrations of the panel (vibrations lower than the resonance frequency corresponding to the resonance peak) are transmitted to the additional element to drive the additional element to vibrate together, and the mass of the additional element increases the mass of the vibration load of the transducer device, and the sensitivity of the acoustic output device is affected by the additional element in a frequency range lower than the resonance frequency corresponding to the resonance peak (similar to the acoustic output device 200). When the transducer device generates mechanical vibrations at a high frequency (a range higher than the resonance frequency corresponding to the resonance peak), since an elastic connection (for example, the presence of a vibration transmission sheet) is maintained between the additional element and the magnetic circuit assembly and the panel, the high-frequency vibrations of the panel hardly drive the additional element to vibrate together, and the mass of the additional element does not affect the mass of the vibration load of the transducer device, thereby guaranteeing that the sensitivity of the acoustic output device is not affected by the additional element in a frequency range higher than the resonance frequency corresponding to the resonance peak.

[0112] Hereinafter, with reference to FIGS. 33 to 46, the acoustic output device according to the embodiments of the present specification will be described in detail.

[0113] FIG. 33 is a schematic configuration diagram of an acoustic output device according to some embodiments of the present specification. As shown in FIG. 33, the acoustic output device 3300 includes a transducer device 3310, a case 3320, a support structure 3330, and an additional element 3340. The transducer device 3310 includes a magnetic circuit assembly 3311, a coil 3312, and a vibration transmission sheet 3313, and the coil 3312 is installed in the magnetic circuit assembly 3311. The case 3320 includes a panel 3321 and a housing 3322, and the panel 3321 and the housing 3322 can form a housing cavity for housing the transducer device 3310, and the coil 3312 is connected to the panel 3321. Further, the housing 3322 may include a back plate 33221 facing the position of the panel 3321 and a housing body 33222 adjacent to the position of the panel 3321. The support structure 3330 may be rigidly connected to the panel 3321. Structures such as the magnetic circuit assembly 3311, the coil 3312, the panel 3321, the housing 3322 (including the back plate 33221 and the housing body 33222), the support member 3323, the support structure 3330, and the additional element 3340 may be similar to the structures such as the magnetic circuit assembly 2011, the coil 2012, the panel 2021, the housing 2022 (including the back plate 20221 and the housing body 20222), the support member 2023, the support structure 2030, and the additional element 2040 in the acoustic output device 2000, and will not be described here.

[0114] In some embodiments, as shown in FIG. 33, the panel 3321 and the back plate 33221 are respectively located at both ends of the housing body 33222 and are rigidly connected to the housing body 33222 to vibrate the panel 3321 and the back plate 33221 together and reduce the occurrence of sound leakage. In some embodiments, the housing body 33222 may be a columnar structure with a hollow interior and open-ended openings at both ends. The panel 3321 and the back plate 33221 are respectively located at both ends of the housing body 33222 having the open-ended openings, and a rigid connection is realized by the housing body 33222. In some embodiments, the housing 3322 may have an integral structure. For example, the housing 3322 may be a structure with a hollow interior and an open-ended opening at one end. The panel 3321 is located at the end of the housing 3322 having the open-ended opening. In some embodiments, the housing body 33222 may include a notch (not shown in FIG. 33). The circumferential side of the magnetic circuit assembly 3311 may extend out of the housing body 3322 through the notch and be rigidly connected to the support member 3323. The additional element 3340 may also be rigidly connected to the support member 3323. By installing in this way, the support member 3323 has a good supporting effect on the magnetic circuit assembly 3311, and the magnetic circuit assembly 3311 is attracted or repelled by the additional element 3340 and undergoes reverse deformation, thereby avoiding affecting the vibration stability of the transducer device 3310.

[0115] The vibration transmission sheet 3313 may include a first vibration transmission sheet 33131 and a second vibration transmission sheet 33132. The first vibration transmission sheet 33131 is located between the magnetic circuit assembly 3311 and the panel 3321 and is elastically connected to the magnetic circuit assembly 3311 and the panel 3321. The second vibration transmission sheet 33132 is located between the magnetic circuit assembly 3311 and the back plate 33221 and is elastically connected to the magnetic circuit assembly 3311 and the back plate 33221. As an illustrative explanation, the side of the magnetic circuit assembly 3311 close to the panel 3321 may be elastically connected to the panel 3321 by the first vibration transmission sheet 33131, and the side of the magnetic circuit assembly 3311 close to the back plate 33221 may be elastically connected to the back plate 33221 by the second vibration transmission sheet 33132. In some embodiments, the number of vibration transmission sheets may be one. For example, the vibration transmission sheet 3313 may include the first vibration transmission sheet 33131, and the magnetic circuit assembly 3311 may be elastically connected to the panel 3321 by the first vibration transmission sheet 33131. Also, for example, the vibration transmission sheet 3313 may include the second vibration transmission sheet 33132, and the magnetic circuit assembly 3311 may be elastically connected to the back plate 33221 by the second vibration transmission sheet 33132. In some embodiments, the first vibration transmission sheet 33131 and the second vibration transmission sheet 33132 may include a central region and a plurality of support rods. The plurality of support rods are distributed at intervals along the peripheral side of the central region. The central region is connected to the side away from the panel of the magnetic circuit assembly 3311, and the end of the support rod away from the central region is connected to the housing. As a mere illustrative explanation, the number of support rods may be four. In this case, the structures of the first vibration transmission sheet 33131 and the second vibration transmission sheet 33132 can be approximately regarded as an "X" - shaped structure. The "X" - shaped structure can provide elasticity in the vibration direction of the transducer device. Also, the plurality of support rods have high structural strength in the direction perpendicular to the vibration direction of the transducer device and can provide a high support effect for the magnetic circuit assembly 3311, thereby avoiding the transducer device from undergoing reverse deformation during its vibration.In some embodiments, the first vibration transmission sheet 33131 and the second vibration transmission sheet 33132 may further include an edge region, the edge region is connected to an end away from the central region of the support rod, and the circumferential side of the edge region may be connected to the housing. For the specific structure of the vibration transmission sheet, reference can be made to the content in other parts of the specification of the present application, for example, FIGS. 46 and 47 and their related descriptions.

[0116] In some embodiments, the additional element 3340 and the magnetic circuit assembly 3311 can vibrate relative to the panel 3321 to generate a resonance peak within the target frequency range. In the frequency range after the resonance frequency corresponding to the resonance peak, the vibration transmission between the additional element 3340 and the panel 3321 is suppressed, that is, the influence of the additional element 3340 on the vibration of the panel 3321 is reduced, thereby ensuring that the sensitivity is not affected or hardly affected by the additional element 3340 in the frequency range where the resonance frequency corresponding to the resonance peak is greater. In some embodiments, in the frequency range higher than the resonance frequency corresponding to the resonance peak, the sensitivity of the acoustic output device 3300 can be made not to be affected by the additional element 3340. In some embodiments, the lower the resonance frequency corresponding to the resonance peak within the target frequency range, the wider the frequency band in which the acoustic output device 3300 can have a flat frequency response curve. In some embodiments, the frequency range in which the additional element 3340 affects the acoustic output device 3300 is reduced so that it has a flat frequency response curve in a wide frequency band, and by adjusting the elastic coefficient of the first vibration transmission sheet 33131 and / or the second vibration transmission sheet 33132 and the mass of the additional element 3340, the resonance frequency corresponding to the resonance peak can be adjusted. In some embodiments, the target frequency range may be 20 Hz to 800 Hz. Preferably, the target frequency range may be 100 Hz to 600 Hz. More preferably, the target frequency range may be 150 Hz to 500 Hz. Even more preferably, the target frequency range may be 200 Hz to 400 Hz.

[0117] In some embodiments, the additional element 3340 and the magnetic circuit assembly 3311 can vibrate with respect to the panel 3321 to generate a resonance dip within the target frequency range. Further, the closer the corresponding frequencies of the resonance peak and the resonance dip are, the smaller the influence on the flatness of the frequency response curve in the overall frequency band of the acoustic output device 3300 becomes. To make the frequency response curve in the overall frequency band of the acoustic output device 3300 flatter, in some embodiments, the frequency corresponding to the resonance dip may be smaller than the frequency corresponding to the resonance peak. In some embodiments, the difference between the frequency corresponding to the resonance peak and the frequency corresponding to the resonance dip may be 300 Hz or less. In some embodiments, the difference between the frequency corresponding to the resonance peak and the frequency corresponding to the resonance dip may be 200 Hz or less. In some embodiments, the difference between the frequency corresponding to the resonance peak and the frequency corresponding to the resonance dip may be 100 Hz or less. The difference between the resonance peak and the resonance dip also has a certain influence on the flatness of the frequency response curve of the acoustic output device 3300. For example, the smaller the difference between the resonance peak and the resonance dip is, the flatter the frequency response curve in the overall frequency band of the acoustic output device 3300 becomes. To make the frequency response curve in the overall frequency band of the acoustic output device 3300 flatter, in some embodiments, the difference between the resonance peak and the resonance dip may be in the range of 20 dB to 100 dB. In some embodiments, the difference between the resonance peak and the resonance dip may be in the range of 20 dB to 60 dB. In some embodiments, the difference between the resonance peak and the resonance dip may be in the range of 20 dB to 40 dB.

[0118] In some embodiments, elastic elements may be connected between both ends of the support member 3323 and the panel 3321 and the back plate 33221, and the elastic elements may seal the gaps between both ends of the support member 3323 and the panel 3321 and the back plate 33221. Alternatively, a filling material may be installed in the gaps between both ends of the support member 3323 and the panel 3321 and the back plate 33221, or elastic elements may be connected to form the case 3320 of the acoustic output device 3300. In some embodiments, both the filling material and the elastic elements may be elastic materials such as silica gel and polyurethane. In this way, the vibration transmission from the panel 3321 and the back plate 33221 to the additional element 3340 can be further reduced, thereby further reducing the influence of the mass of the additional element on the mass of the vibration load of the transducer device, and thereby reducing the influence of the additional element on the sensitivity of the acoustic output device 3300.

[0119] In some embodiments, the housing body 33222 may have a plate-like structure or a rod-like structure, and both ends of the housing body 33222 are rigidly connected to the panel 3321 and the back plate 33221 respectively. For example, the housing body 33222 may have two plate-like structures, and both ends of the two plate-like structures are rigidly connected to the panel 3321 and the back plate 33221 respectively.

[0120] FIG. 34 is a frequency response curve diagram of an acoustic output device according to some embodiments of the present specification.

[0121] As shown in FIG. 34, the horizontal axis represents frequency (Hz), the vertical axis represents the corresponding sound pressure (dB) at different frequencies of the acoustic output device, curve L341 is the frequency response curve of the acoustic output device 3300 when the additional element 3340 is not installed, and curve L342 is the frequency response curve of the acoustic output device 3300 with the additional element 3340. As can be seen from curves L341 and L342, in the frequency range of 10 Hz to 100 Hz, a resonance peak occurs in the acoustic output device 3300. In the range higher than the resonance frequency corresponding to the resonance peak, curves L341 and L342 tend to overlap and have a relatively flat frequency response curve within the frequency range of 200 Hz to 10,000 Hz. As can be understood from this, the sensitivity of the acoustic output device 3300 can be made not to be affected by the mass of the additional element 3340 in the range higher than the resonance frequency corresponding to the resonance peak, have a relatively flat frequency response curve, and guarantee that the acoustic output device has a good acoustic output effect.

[0122] FIG. 35 is a schematic configuration diagram of an acoustic output device according to some embodiments of the present specification. The difference between the acoustic output device 3500 shown in FIG. 35 and the acoustic output device 3300 shown in FIG. 33 is that the support structure 3330 in the acoustic output device 3500 may be rigidly connected to the support member 3323.

[0123] FIG. 36 is a frequency response curve diagram of the acoustic output device according to some embodiments of the present specification. As shown in FIG. 36, the horizontal axis is the frequency (Hz), the vertical axis is the corresponding sound pressure (dB) at different frequencies of the acoustic output device, the curve L361 is the frequency response curve of the acoustic output device 3500 when the mass of the additional element 3340 is 0, and the curve L362 is the frequency response curve of the acoustic output device 3500 when the additional element 3340 has a certain mass (the mass is not 0). As can be seen from the curves L361 and L362, in the frequency range of 10 Hz to 100 Hz, a resonance peak occurs in the acoustic output device 3300. In the range higher than the resonance frequency corresponding to the resonance peak, the curves L361 and L362 tend to overlap and have a relatively flat frequency response curve within the frequency range of 200 Hz to 10,000 Hz. As can be understood from this, the sensitivity of the acoustic output device 3500 can be made not to be affected by the mass of the additional element 3340 in the range higher than the resonance frequency corresponding to the resonance peak, and has a relatively flat frequency response curve, ensuring that the acoustic output device has a good acoustic output effect. In some embodiments, the support structure 3330 may be rigidly connected to the back plate 33221.

[0124] FIG. 37 is a schematic configuration diagram of an acoustic output device according to some embodiments of the present specification. As shown in FIG. 37, the support member 3323 in the acoustic output device 3700 may have a cylindrical structure, and the cylindrical structure may be installed to surround the circumferential side of the magnetic circuit assembly 3311 along the circumferential side of the housing body 33222. The circumferential side of the magnetic circuit assembly 3311 is rigidly connected to the inner surface of the cylindrical structure, and the additional element 3340 is rigidly connected to the cylindrical structure. As an exemplary description, when the support member 3023 is located outside the housing 3022, the circumferential side of the magnetic circuit assembly 3311 may extend outside the housing 3022 through a notch provided in the housing body 33222 and be rigidly connected to the support member 3323. In some embodiments, the support member 3323 may be located inside the housing 3322, and the circumferential side of the magnetic circuit assembly 3311 may be rigidly connected to the support member 3323 without passing through the housing body 33222. In some embodiments, elastic elements may be connected between both ends of the support member 3323 or both ends of the magnetic circuit assembly 3311 and the panel 3321 and the back plate 33221 to seal the gap between both ends of the support member 3323 and the panel 3321 and the back plate 33221 by the elastic elements. Alternatively, a filling material may be installed in the gap between both ends of the support member 3323 and the panel 3321 and the back plate 33221, or an elastic element may be connected to form the case 3320 of the acoustic output device 3300. In some embodiments, both the filling material and the elastic element may be elastic materials such as silica gel and polyurethane. In this way, the vibration transmission from the panel 3321 and the back plate 33221 to the additional element 3340 can be further reduced, thereby further reducing the influence of the mass of the additional element on the mass of the vibration load of the transducer device, and thereby reducing the influence of the additional element on the sensitivity of the acoustic output device 3300.

[0125] FIG. 38 is a schematic configuration diagram of an acoustic output device according to some embodiments of the present specification.

[0126] As shown in FIG. 38, the support member 3323 in the acoustic output device 3800 may have a plate-like structure. The plate-like structure is installed on one side of the housing body 33222. Both ends of the magnetic circuit assembly 3311 are elastically connected to the panel 3321 and the back plate 33221 by elastic elements respectively. The magnetic circuit assembly 3311 is rigidly connected to the plate-like structure, and the additional element 3340 is rigidly connected to the plate-like structure. In the embodiments of the present application, the elastic element may be a spring, a vibration transmission sheet, or other structures having elasticity. In the embodiments of the present application, the elastic element includes a first vibration transmission sheet 33131 and a second vibration transmission sheet 33132 located on both sides of the magnetic circuit assembly 3311. The first vibration transmission sheet 33131 and the second vibration transmission sheet 33132 connect the magnetic circuit assembly 3311 to the panel 3321 and the magnetic circuit assembly 3311 to the back plate 33221 respectively. As an illustrative explanation, when the plate-like structure is located outside the housing 3022, the side of the magnetic circuit assembly 3311 close to the plate-like structure toward the housing body 33222 may extend outside the housing 3322 through a notch provided in the housing body 33222 and be rigidly connected to the plate-like structure. In some embodiments, the plate-like structure may be located inside the housing 3322, and one side of the magnetic circuit assembly 3311 may be connected to the plate-like structure without penetrating the housing body 33222. In some embodiments, the plate-like structure may be located in the notch, and the elastic connection between both ends of the plate-like structure and the housing body 3322 may be realized by elastic elements or by filling with elastic materials. Note that the support structure 3330 in FIG. 38 is not limited to being rigidly connected to the panel 3321, and may be rigidly connected to the housing body 33222 or the back plate 33221. Also, the number of plate-like structures is not limited to one shown in FIG. 38, and may be two, three or more.

[0127] FIG. 39 is a schematic configuration diagram of an acoustic output device according to some embodiments of the present specification.

[0128] As shown in FIG. 39, the difference between the acoustic output device 3900 and the acoustic output device 3300 shown in FIG. 33 is that the vibration transmission sheet 3313 in the acoustic output device 3900 includes only one vibration transmission sheet (for convenience of explanation, this vibration transmission sheet is still represented as the vibration transmission sheet 3313 in FIG. 39), the vibration transmission sheet 3313 is located between the magnetic circuit assembly 3311 and the panel 3321, and is elastically connected to the magnetic circuit assembly 3311 and the panel 3321. Note that the support structure 3330 in FIG. 39 is not limited to being rigidly connected to the panel 3321, and may be rigidly connected to the housing body 33222 or the back plate 33221.

[0129] FIG. 40 is a schematic configuration diagram of an acoustic output device according to some embodiments of the present specification.

[0130] As shown in FIG. 40, the difference between the acoustic output device 4000 and the acoustic output device 3300 shown in FIG. 33 is that the vibration transmission sheet 3313 in the acoustic output device 4000 includes only one vibration transmission sheet (for convenience of explanation, this vibration transmission sheet is still represented as the vibration transmission sheet 3313 in FIG. 40), the vibration transmission sheet 3313 is located between the magnetic circuit assembly 3311 and the back plate 33221, and is elastically connected to the magnetic circuit assembly 3311 and the back plate 33221.

[0131] Note that the fact that the support member has a cylindrical structure or a plate-like structure is similarly applicable to the support member 3323 in the acoustic output devices 3900 and 4000. Specifically, reference may be made to the acoustic output device 3700 shown in FIG. 37 or the acoustic output device 3800 shown in FIG. 38, which will not be described here. Also, the support structure 3330 in FIG. 40 is not limited to being rigidly connected to the panel 3321, and may be rigidly connected to the housing body 33222 or the back plate 33221.

[0132] FIG. 41 is a schematic configuration diagram of an acoustic output device according to some embodiments of the present specification.

[0133] As shown in FIG. 41, structures such as the transducer device 4110 (including the magnetic circuit assembly 4111, the coil 4112, and the vibration transmission sheet 4113), the case 4120 (including the panel 4121 and the housing 4122), the support structure 4130, and the additional element 4140 in the acoustic output device 4100 may be similar to the structures such as the transducer device 400 (including the magnetic circuit assembly 411, the coil 412, and the vibration transmission sheet 413A), the support structure 430, and the additional element 440 in the acoustic output device 3900. The main difference between the acoustic output device 4100 and the acoustic output device 400 is that the additional element 4140 in the acoustic output device 4100 is rigidly connected to the side wall (i.e., the housing body 41222) adjacent to the position of the panel 4121 in the housing 4122, and the magnetic circuit assembly 4111 is rigidly connected to the housing body 41222. By installing in this way, the housing body 41222 has a good supporting effect on the magnetic circuit assembly 4111, and the magnetic circuit assembly 4111 is attracted or repelled by the additional element 4140 to undergo reverse deformation, thereby avoiding affecting the vibration stability of the transducer device 4110.

[0134] In some embodiments, as shown in FIG. 41, the housing 4122 can be regarded as a structure with a hollow interior and an open-ended opening at one end facing the panel 4121. Further, the housing 4122 may include a back plate 41221 (the side wall of the housing 4122 opposite to the position of the panel) and a housing body 41222 (the side wall of the housing 4122 adjacent to the position of the panel 4121). The panel 4121 and the back plate 41221 may be located at both ends of the housing body 41222 respectively. The vibration transmission sheet 4113 may be located between the panel 4121 and the magnetic circuit assembly 4111 and may be elastically connected to the magnetic circuit assembly 4111 and the panel 4121.

[0135] In some embodiments, as shown in FIG. 41, one end of the panel 4121 and the housing body 41222 may be connected by an elastic element 4450. Due to the presence of the vibration transmission sheet 4113 and the elastic element 4150, the additional element 4140 and the magnetic circuit assembly 4111 can vibrate with respect to the panel 4221 to generate a resonance peak within the target frequency range. Further, the vibration transmission sheet 4113 and the elastic element 4150 can reduce or avoid transmitting vibrations within a frequency range higher than the resonance frequency corresponding to the resonance peak of the panel 4121 to the additional element 4140. In a frequency range higher than the resonance frequency corresponding to the resonance peak, the mass of the additional element does not affect the mass of the vibration load of the transducer device, thereby ensuring that the sensitivity of the acoustic output device is not affected by the additional element within a frequency range higher than the resonance frequency corresponding to the resonance peak. It should be noted that the elastic element being a leaf spring structure, an elastic ring structure, or an elastic adhesive is similarly applicable to the elastic element 4150 in the acoustic output device 4100. Specifically, reference can be made to the acoustic output device 400 shown in FIG. 4.

[0136] It should be noted that the support structure 4130 in FIG. 41 is not limited to being rigidly connected to the panel 4121, and may be rigidly connected to the housing body 41222 or the back plate 41221.

[0137] It should be noted that in the acoustic output device 900 shown in FIG. 9, by forming a decompression hole 9221 in the housing 922, the resonance frequency corresponding to the resonance peak generated by driving the elastic element to vibrate the additional element with respect to the panel can be reduced, and the frequency range in which the sensitivity of the acoustic output device is not affected or is less affected by the additional element can be widened. Also, the mode of reducing high-frequency sound leakage by elastically connecting the back plate of the acoustic output device 1200 and the side wall adjacent to the panel of the housing is similarly applicable to the acoustic output device 4100.

[0138] Since the additional element has a certain mass, there is a certain distance between the center of mass of the entire acoustic output device and the driving force direction of the magnetic circuit assembly in the transducer device, which generates vibration and sway of the magnetic circuit assembly in the transducer device. In this way, not only does it affect the vibration stability of the transducer device, but it also increases the sound leakage of the acoustic output device. Hereinafter, with reference to FIG. 42, the influence of the additional element on the sound leakage of the acoustic output device will be specifically described.

[0139] FIG. 42 is a frequency response curve of an acoustic output device according to some embodiments of the present specification.

[0140] As shown in FIG. 42, curve L441 is a sound leakage frequency response curve corresponding to the side of the housing body 33222 of the acoustic output device 3300 where the additional element is installed, and curve L442 is a sound leakage frequency response curve corresponding to the side opposite to the side of the housing body 33222 of the acoustic output device 3300 where the additional element is installed. The sound leakage frequency response curves L441 and L442 can be measured by collecting the air-conducted sound on the housing body 33222 side in the acoustic output device 3300. As can be seen from curves L441 and L442, in the frequency range of 500 Hz to 2000 Hz, the acoustic output device 3300 generates a sound leakage resonance peak 4411. The sound leakage resonance peak 4411 is generated when the magnetic circuit assembly 3311 vibrates and sways. Due to the presence of the sound leakage resonance peak 4421, the acoustic output device 3300 generates a large sound leakage within the operating frequency band (for example, 500 Hz to 2000 Hz). Therefore, in some embodiments, by adjusting the position of the sound leakage resonance peak 4411, the resonance frequency corresponding to the sound leakage resonance peak can be separated from the operating frequency band as much as possible, so that the acoustic output device can avoid having a large sound leakage within the operating frequency band. In some embodiments, by adjusting the elastic coefficient of the first vibration transmission sheet 33131 and / or the second vibration transmission sheet 33132, the resonance frequency corresponding to the sound leakage resonance peak can be adjusted. For example, by adjusting the elastic coefficient of the vibration transmission sheet or adjusting the position of the connection point between the leaf spring and other structures, the leaf spring is made less likely to undergo reverse deformation. Currently, the most effective method for the sample is to adjust the elastic coefficient of the vibration transmission sheet and then adjust the reverse rigidity (ease of reverse deformation) of the vibration transmission sheet. By designing an X-shaped vibration transmission sheet, a relatively large reverse rigidity can be obtained while keeping the elastic coefficient of the vibration transmission sheet (deforming along the vibration direction) as much as possible. For an explanation of how to adjust the resonance frequency corresponding to the sound leakage resonance peak, reference can be made to FIGS. 44 and 45 and their related descriptions.

[0141] FIG. 43 is the frequency response curve of the acoustic output device according to some embodiments of the present specification. The frequency response curve in FIG. 43 can be measured by collecting the air-conducted sound on the panel 3321 side in the acoustic output device. As shown in FIG. 43, L451 is the frequency response curve of the acoustic output device 3300 when the elastic coefficients of the first vibration transmission sheet 33131 and the second vibration transmission sheet 33132 are K1, and L452 is the frequency response curve of the acoustic output device 3300 when the elastic coefficients of the first vibration transmission sheet 33131 and the second vibration transmission sheet 33132 are K2, and L453 is the frequency response curve of the acoustic output device 3300 when the elastic coefficients of the first vibration transmission sheet 33131 and the second vibration transmission sheet 33132 are K3, where K1 < K2 < K3. The resonance peak in the region L is the resonance peak generated by the additional element 3340 and the magnetic circuit assembly 3311 in the acoustic output device 3300 within the target frequency range with respect to the panel 3321. As can be seen from the curves L451, L452, and L453, in the range higher than the resonance frequency corresponding to the resonance peak, the acoustic output device 3300 has a relatively flat frequency response curve and has a good acoustic output effect. As the elastic coefficients of the first vibration transmission sheet 33131 and the second vibration transmission sheet 33132 increase, the resonance frequency corresponding to the resonance peak increases. In order to have a relatively flat frequency response curve within a wider frequency range, in some embodiments, by adjusting the elastic coefficients of the first vibration transmission sheet 33131, the second vibration transmission sheet 33132 and / or the mass of the additional element, the resonance frequency corresponding to the resonance peak can be made within the target frequency range. In some embodiments, the target frequency range may be 800 Hz or less. Preferably, the target frequency range may be 700 Hz or less. More preferably, the target frequency range may be 500 Hz or less. Even more preferably, the target frequency range may be 300 Hz or less. Even more preferably, the target frequency range may be 200 Hz or less.

[0142] FIG. 44 is the sound leakage frequency response curve of the acoustic output device according to some embodiments of the present specification. The sound leakage frequency response curve in FIG. 44 can be measured by collecting the air-conducted sound on the side facing the additional element 3340 of the housing 3322 in the acoustic output device 3300. As shown in FIG. 44, L461 is the sound leakage frequency response curve of the acoustic output device 3300 when the elastic coefficients of the first vibration transmission sheet 33131 and the second vibration transmission sheet 33132 are K1, L462 is the sound leakage frequency response curve of the acoustic output device 3300 when the elastic coefficients of the first vibration transmission sheet 33131 and the second vibration transmission sheet 33132 are K2, and L463 is the sound leakage frequency response curve of the acoustic output device 3300 when the elastic coefficients of the first vibration transmission sheet 33131 and the second vibration transmission sheet 33132 are K3, where K1 < K2 < K3. The sound leakage resonance peak in the region M is the sound leakage resonance peak in each sound leakage frequency response curve. As can be seen from the curves L461, L462, and L463, as the elastic coefficients of the first vibration transmission sheet 33131 and the second vibration transmission sheet 33132 increase, the resonance frequency corresponding to the sound leakage resonance peak increases. In some embodiments, by adjusting the elastic coefficients of the first vibration transmission sheet 33131 and the second vibration transmission sheet 33132, the resonance frequency corresponding to the resonance of the sound leakage frequency response curve can be made smaller than the resonance frequency of the frequency response curve of the acoustic output device, thereby reducing the sound leakage on the side of the acoustic output device 3300 facing the additional element 3340 of the housing 3322. In some embodiments, the resonance frequency corresponding to the resonance of the sound leakage frequency response curve may be smaller than 700 Hz. Preferably, the resonance frequency corresponding to the resonance of the sound leakage frequency response curve may be smaller than 500 Hz. More preferably, the resonance frequency corresponding to the resonance of the sound leakage frequency response curve may be smaller than 300 Hz. Even more preferably, the resonance frequency corresponding to the resonance of the sound leakage frequency response curve may be smaller than 200 Hz.

[0143] FIG. 45 is the sound leakage frequency response curve of the acoustic output device according to some embodiments of the present specification. The sound leakage frequency response curve in FIG. 45 can be measured by collecting the air-conducted sound on the side where the additional element 3340 of the housing 3322 in the acoustic output device 3300 is located.

[0144] As shown in FIG. 45, L471 is the sound leakage frequency response curve of the acoustic output device 3300 when the elastic coefficients of the first vibration transmission sheet 33131 and the second vibration transmission sheet 33132 are K1, L472 is the sound leakage frequency response curve of the acoustic output device 3300 when the elastic coefficients of the first vibration transmission sheet 33131 and the second vibration transmission sheet 33132 are K2, and L473 is the sound leakage frequency response curve of the acoustic output device 3300 when the elastic coefficients of the first vibration transmission sheet 33131 and the second vibration transmission sheet 33132 are K3, where K1 < K2 < K3. The sound leakage resonance peaks within the region N are the sound leakage resonance peaks in each sound leakage frequency response curve. As can be seen from the curves L471, L472, and L473, as the elastic coefficients of the first vibration transmission sheet 33131 and the second vibration transmission sheet 33132 increase, the resonance frequency corresponding to the sound leakage resonance peak increases. In some embodiments, by adjusting the elastic coefficients of the first vibration transmission sheet 33131 and the second vibration transmission sheet 33132, the resonance frequency corresponding to the resonance of the sound leakage frequency response curve can be made smaller than the resonance frequency of the frequency response curve of the acoustic output device, thereby reducing the sound leakage on the side of the housing 3322 having the additional element 3340 in the acoustic output device 3300. In some embodiments, the resonance frequency corresponding to the resonance of the sound leakage frequency response curve may be smaller than 700 Hz. Preferably, the resonance frequency corresponding to the resonance of the sound leakage frequency response curve may be smaller than 500 Hz. More preferably, the resonance frequency corresponding to the resonance of the sound leakage frequency response curve may be smaller than 300 Hz. Even more preferably, the resonance frequency corresponding to the resonance of the sound leakage frequency response curve may be smaller than 200 Hz. In some embodiments, the elastic coefficients of the first vibration transmission sheet 33131 and the second vibration transmission sheet 33132 are related to their structures, and by designing the structures of the first vibration transmission sheet 33131 and the second vibration transmission sheet 33132, the first vibration transmission sheet 33131 and the second vibration transmission sheet 33132 can have large elastic coefficients, and the resonance frequency of the sound leakage resonance peak of the acoustic output device 3300 can be moved away from the operating frequency band.In some embodiments, when the first vibration transmission sheet 33131 and the second vibration transmission sheet 33132 use the structure of the vibration transmission sheet 4800 shown in FIG. 46, the elastic coefficients of the first vibration transmission sheet 33131 and the second vibration transmission sheet 33132 are large, and the acoustic output device 3300 can reduce sound leakage within a wide operating frequency band. Hereinafter, with reference to FIG. 46, the structure of the vibration transmission sheet will be described in detail.

[0145] (a) to (c) in FIG. 46 are schematic plan configuration diagrams of vibration transmission sheets according to some embodiments of the present specification. (a) to (c) in FIG. 47 are schematic three-dimensional configuration diagrams of vibration transmission sheets according to some embodiments of the present specification.

[0146] As shown in FIGS. 46 and 47, the vibration transmission sheet 4800 may include a central region 4810, an edge region 4820, and a plurality of support rods 4830 connecting the central region 4810 and the edge region 4820. When the vibration transmission sheet 4800 is used to connect a magnetic circuit assembly and a case (for example, a panel or a back plate) in an acoustic output device, the central region 4810 of the vibration transmission sheet 4800 may be connected to the magnetic circuit assembly, and the edge region 4820 of the vibration transmission sheet 4800 may be connected to the case. As an exemplary description, when the first vibration transmission sheet 33131 in the acoustic output device 3300 is the vibration transmission sheet 4800, the central region 4810 of the vibration transmission sheet 4800 may be connected to the side close to the panel 3321 of the magnetic circuit assembly 3311, and the edge region 4820 of the vibration transmission sheet 4800 may be connected to the panel 3321. When the second vibration transmission sheet 33132 in the acoustic output device 3300 is the vibration transmission sheet 4800, the central region 4810 of the vibration transmission sheet 4800 may be connected to the side close to the back plate 33221 of the magnetic circuit assembly 3311, and the edge region 4820 of the vibration transmission sheet 4800 may be connected to the back plate 33221.

[0147] In some embodiments, in the natural state of the vibration transmission sheet 4800, the edge region 4820 of the vibration transmission sheet 4800 and the central region 4810 of the vibration transmission sheet 4800 may not be flush. By installing in this way, when the magnetic circuit assembly in the acoustic output device is connected to the panel and / or the back plate, a tightening force can be generated. Due to the presence of the tightening force, when the transducer device vibrates, the elastic force on the vibration transmission sheet 4800 does not become zero, which is advantageous for improving the vibration stability of the transducer device in the acoustic output device. The natural state of the vibration transmission sheet 4800 may be a structural state when the vibration transmission sheet 4800 is assembled to the transducer device of the acoustic output device and does not generate mechanical vibration without inputting an excitation signal to the transducer device. Note that the edge region 4820, the central region 4810 of the vibration transmission sheet 4800, and the support rod 4830 may be in the same plane.

[0148] In some embodiments, as shown in FIGS. 46 and 47, the number of support rods 4830 in the vibration transmission sheet 4800 may be four. The four support rods 4830 may be installed at intervals along the circumferential side of the central region 4810 of the vibration transmission sheet 4800 and may be symmetrically distributed with respect to the center line of the central region 4810. In this way, it is advantageous for increasing the elastic coefficient of the entire vibration transmission sheet 4800.

[0149] In order to further increase the elastic coefficient of the entire vibration transmission sheet 4800, in some embodiments, as shown in FIGS. 46 and 47, the support rod 4830 may include one or more bent structures 4831 installed along its extending direction.

[0150] In some embodiments, as shown in FIG. 47, a through hole 4811 may be installed in the central region 4810 of the vibration transmission sheet 4800. The through hole 4811 is used for inserting the boss in the magnetic circuit assembly, and further realizes the fixed connection between the central region 4810 and the magnetic circuit assembly through the cooperation of the boss and the through hole.

[0151] When the additional element has a metal material or a magnet inside, in order to avoid magnetic attraction between the additional element and the magnetic circuit assembly of the transducer device, reduce the influence of magnetic attraction of the additional element on the magnetic circuit assembly, and avoid the offset of the magnetic circuit assembly in the transducer device, the rigidity in any direction (hereinafter abbreviated as the radial direction) in the plane perpendicular to the vibration direction of the vibration transmission sheet 4800 may be greater than the rigidity threshold. For example, based on the width of the magnetic gap and the magnetic attraction force between the magnetic circuit assembly and the additional element, it can be determined that the equivalent rigidity in the radial direction of the vibration transmission sheet 4800 is greater than 4.7×10 4 N / m. For example, the equivalent rigidity in the radial direction of the vibration transmission sheet 4800 may be greater than 6.4×10 4 N / m. By optimizing the rigidity in the length and width directions in the plane perpendicular to the vibration direction of the vibration transmission sheet 4800 having elasticity, it is possible to resist the magnetic attraction force between the magnetic circuit assembly and the additional element, realize that no offset occurs in the magnetic circuit assembly in the transducer device, and ensure the stability during vibration.

[0152] As shown in FIG. 49B, FIG. 49B is a schematic configuration diagram of a magnetic circuit assembly according to some other embodiments of the present application. In some embodiments of the present application, the magnetic circuit assembly 49123 may further include a magnet assembly 491231, a magnetic flux conduction cover 491232 (not shown), and at least one vibration transmission sheet 49122. The vibration transmission sheet 49122 may be connected between the magnetic flux conduction cover 491232 and the magnet assembly 491231 to elastically support the magnet assembly 49123 within the magnetic flux conduction cover 491232. In one embodiment of the present application, there are two vibration transmission sheets included in the transducer device, namely the first vibration transmission sheet and the second vibration transmission sheet respectively. The first vibration transmission sheet and the second vibration transmission sheet are respectively distributed on both sides of the magnet assembly along the vibration direction of the magnet assembly, and are used to elastically support the magnet assembly respectively. In some embodiments, the vibration transmission sheet and the magnetic circuit assembly 49123 may be arranged along the vibration direction, and the side surface of the vibration transmission sheet perpendicular to the vibration direction may be connected to the end portion of the magnetic flux conduction cover perpendicular to the vibration direction, thereby realizing the fixation of the magnet assembly. In some examples, by installing a vibration transmission sheet having a specific rigidity, it is possible to resist the magnetic attraction force between the magnet assembly and the magnetic flux conduction cover and avoid the offset of the magnet assembly in the transducer device. In some examples, the equivalent rigidity in the radial direction of at least one vibration transmission sheet may be greater than 4.7×10 4 N / m. For example, the transducer device may include only at least one vibration transmission sheet. Also, for example, the transducer device may include only at least two vibration transmission sheets 4800, such as the first vibration transmission sheet and the second vibration transmission sheet. The equivalent rigidity in the radial direction of each of the first vibration transmission sheet and the second vibration transmission sheet may also be greater than 4.7×10 4 N / m.

[0153] In some embodiments, based on the requirements for the equivalent rigidity in the radial direction of the vibration transmission sheet 4800, the relevant dimensional data of the vibration transmission sheet 4800 can be determined. In some embodiments, along the longitudinal direction of the vibration transmission sheet 4800, the ratio between the distance between the starting point and the ending point of the support rod 4830 and the length of the support rod 4830 itself may be within the range of 0 to 1.2. The distance along the longitudinal direction of the vibration transmission sheet 4800 between the starting point and the ending point of the support rod 4830 is the distance along the longitudinal direction of the vibration transmission sheet 4800 between the connection point of the support rod 4830 and the central region 4810 of the vibration transmission sheet and the connection point of the support rod 4830 and the edge region 4820 of the vibration transmission sheet. For example, in (b) of FIG. 47, along the longitudinal direction of the vibration transmission sheet 4800, the ratio between the distance SE between the starting point S and the ending point E of the support rod 4830 and the total length of the curved support rod 4830 may be within the range of 0.7 to 0.85. In some embodiments, along the width direction of the vibration transmission sheet 4800, the ratio between the distance between the starting point and the ending point of the support rod 4830 and the length of the support rod 4830 itself may be within the range of 0 to 0.5. The distance along the width direction of the vibration transmission sheet 4800 between the starting point and the ending point of the support rod 4830 is the distance along the width direction of the vibration transmission sheet 4800 between the connection point of the support rod 4830 and the central region 4810 of the vibration transmission sheet and the connection point of the support rod 4830 and the edge region 4820 of the vibration transmission sheet. For example, as shown in (b) of FIG. 47, along the width direction of the vibration transmission sheet 4800, the ratio between the distance S'E' between the starting point S and the ending point E of the support rod 4830 and the total length of the curved support rod 4830 may be within the range of 0.15 to 0.35.

[0154] In some embodiments, the length of the support rod 4830 may be in the range of 7 mm to 25 mm. In some embodiments, the thickness of the support rod along the axial direction of the transducer device (i.e., the thickness of the vibration transmission sheet) may be in the range of 0.1 mm to 0.2 mm. In some embodiments, the ratio of the thickness of the vibration transmission sheet along the axial direction of the transducer device to the width of the plane along the radial direction of the transducer device of any one of the support rods 4830 may be in the range of 0.16 to 0.75. Exemplary ranges of the thickness-to-width ratio may include 0.2 to 0.7, 0.26 to 0.65, 0.3 to 0.6, 0.36 to 0.55, or 0.4 to 0.5, etc. In some embodiments, the thickness of the vibration transmission sheet 4800 is in the range of 0.1 mm to 0.2 mm, and the width of the support rod 4830 may be in the range of 0.25 mm to 0.5 mm. For example, the thickness of the vibration transmission sheet 4800 may be in the range of 0.1 mm to 0.15 mm, and the width of the support rod 4830 may be in the range of 0.4 mm to 0.48 mm.

[0155] Note that the structure of the vibration transmission sheet 4800 shown in FIGS. 46 and 47 can be applied to the vibration transmission sheets in any acoustic output device according to the embodiments of this specification, for example, the first vibration transmission sheet 33131 and the second vibration transmission sheet 33132 in the acoustic output device 3300, the vibration transmission sheet 3313 in the acoustic output devices 3900 and 4000, the vibration transmission sheets 413A and 413B in the acoustic output devices 400 and 700, the vibration transmission sheets 913A and 913B in the acoustic output device 900, the vibration transmission sheets 1213A and 1213B in the acoustic output device 1200, the vibration transmission sheets 2013A and 2013B in the acoustic output devices 2000, 2200, 2400, 2500, 2600, 2700, etc.

[0156] Examples in this specification describe the acoustic output device 4900. In some examples, the acoustic output device 4900 may include an acoustic output unit 4910 and a support structure 4920, and the acoustic output unit 4910 is connected to the support structure 4920. The support structure 4920 may be used to support the acoustic output unit 4910 to be mounted at the mounting position. In some examples, the mounting position may be a specific position on the user's head. For example, the mounting position may include the ear, mastoid process, temporal bone, parietal bone, frontal bone, etc. Also for example, the mounting position may include positions on both the left and right sides of the head and in front of the user's ears on the sagittal axis of the human body. In some examples, the acoustic output unit 4910 may include a transducer device, and the transducer device may be used to convert an electrical signal (including voice information) into mechanical vibration so that the user can hear voice through the acoustic output device 4900. Specifically, the mechanical vibration generated by the acoustic output unit 4910 may be mainly transmitted (i.e., bone conduction) by a medium such as the user's skull to form bone-conducted voice, may be mainly transmitted (i.e., air conduction) by a medium such as air to form air-conducted voice, or may transmit voice by a method combining bone conduction and air conduction. For more descriptions regarding the acoustic output unit 4910, reference can be made to other parts of this specification, such as FIGS. 49A to 51 and their related descriptions.

[0157] In some examples, the support structure 4920 may be installed annularly and may be installed to surround the user's head through the user's forehead and occipital region. In some examples, the support structure 4920 may be a headband structure forming a curved shape and may be mounted on the rear side of the user's head. In some examples, the support structure 4920 may be an earhook structure, and the earhook structure suspended on the user's auricle has a curved portion adapted to the human ear. In some examples, the support structure 4920 may have pads and temples on both sides and may be a spectacle frame structure that can be mounted on the user's face and ears. For more embodiments regarding the support structure 4920, reference can be made to (a) to (c) in FIG. 48 and their related descriptions.

[0158] In FIGS. 48(a) to 48(c), the mounting schematic diagrams of the acoustic output device 4900 according to some embodiments of the present specification are shown. In some embodiments, as shown in FIG. 48(a), the support structure 4920 may be installed annularly around the user's ear so that the acoustic output unit 4910 is fixed to the user's face and close to the user's ear canal. In some embodiments, as shown in FIG. 48(b), the support structure 4920 may be installed as an earhook and a rear hook structure so that the acoustic output unit 4910 is fixed to the user's face and close to the user's ear canal, and may cooperate to be installed around the rear side of the user's head and around the auricle. In some embodiments, as shown in FIG. 48(c), the support structure 4920 is a head beam structure forming a curved shape so that the acoustic output unit 4910 is fixed to the user's face and close to the user's ear canal, and may be installed around the top of the user's head.

[0159] In some embodiments, the acoustic output device 4900 may include at least two acoustic output units 4910. The at least two acoustic output units 4910 can all convert electrical signals into mechanical vibrations so that the acoustic output device 4900 achieves a stereo effect. For example, the acoustic output device 4900 may include two acoustic output units 4910. The two acoustic output units 4910 may be installed on the left ear side and the right ear side of the user, respectively. In some application scenarios where the requirement for stereo is not particularly high (for example, hearing aid for patients with hearing impairment, presenting lines to the emcee during live broadcast, etc.), only one acoustic output unit 4910 may be installed in the acoustic output device 4900.

[0160] When the audio output device 4900 includes two audio output units 4910, illustratively, the support structure 4920 may include two earhook assemblies and one headband assembly. Both ends of the headband assembly are respectively connected to one end of the corresponding earhook assembly. The other end of each earhook assembly, which is away from the headband assembly, is respectively connected to the corresponding audio output unit 4910. Specifically, the headband assembly may be installed in a curved shape so as to surround the rear side of the user's head, and the earhook assembly may be installed in a curved shape so as to be hung between the user's ear and head, which further facilitates the wearing requirement of the audio output device 4900. In this way, when the audio output device 4900 is in a worn state, the two audio output units 4910 are respectively located on the left and right sides of the user's head, and the two audio output units 4910 also press the user's head due to the cooperative action of the support structure 4920, and the user can also hear the sound output from the audio output device 4900.

[0161] In some embodiments, the audio output unit 4910 in this specification may be a bone conduction speaker and / or an air conduction speaker. In some embodiments, the audio output device 4900 may be an electronic device having an audio function. For example, the audio output device 4900 may be an electronic device such as a music earphone, a hearing aid earphone, a bone conduction earphone, a hearing aid, an audio glasses, a smart helmet, a VR device, an AR device, etc.

[0162] FIG. 49A is a schematic configuration diagram of an acoustic output unit 4910 according to some embodiments of the present specification. As shown in FIG. 49A, the acoustic output unit 4910 may include a housing 4911, a transducer device 4912, and a panel 4913 (also referred to as a diaphragm). An accommodation cavity for accommodating the transducer device 4912 may be formed within the housing 4911. The transducer device 4912 may be installed within the accommodation cavity of the housing 4911, and the panel 4913 may be connected to the transducer device 4912 and used to transmit the mechanical vibration generated by the transducer device 4912 to the user. A support structure 4920 may be connected to the outside of the housing 4911. In some embodiments, the transducer device 4912 converts an electrical signal into a mechanical vibration, the panel 4913 may contact the user's skin in a worn state, and the mechanical vibration generated by the transducer device 4912 is transmitted to the panel and acts on the user's auditory nerve through the user's skin, skeleton, and / or tissue, thereby forming bone-conducted sound. Note that the housing 4911 may be rectangular, circular, diamond-shaped, polygonal, etc., or any irregular shape, and combinations thereof, and is not limited to the shape shown in the figure.

[0163] In some embodiments, the acoustic output unit 4910 may further include a vibration damping sheet 4914. The transducer device 4912 is suspended in the housing cavity of the housing 4911 by the vibration damping sheet 4914. The panel 4913 may not contact the housing 4911. In this case, due to the presence of the vibration damping sheet 4914, the mechanical vibrations generated by the transducer device 4912 are hardly transmitted to the housing 4911 and may not be transmitted at all. Thereby, the housing 4911 is to some extent prevented from driving the vibration of the external air of the acoustic output unit 4910, which is advantageous for reducing the sound leakage of the acoustic output unit 4910. In some embodiments, the housing 4911 has an open end, and the panel 4913 may be installed outside the housing 4911 and face the open end. That is, the edge of the panel 4913 is not connected to the open end of the housing 4911, and a connecting rod 49131 is installed between the panel 4913 and the transducer device 4912. One end of the connecting rod 49131 is connected to the transducer device 4912, and the other end passes through the open end of the housing 4911 and is connected to the panel 4913 to prevent the vibrating panel 4913 and transducer device 4912 from contacting the housing 4911, thereby reducing the sound leakage of the acoustic output unit 4910. In some embodiments, the vibration damping sheet 4914 may be connected between the connecting rod 49131 and the housing 4911 to realize the suspension of the panel 4913 and the transducer device 4912. In some embodiments, in order to reduce the sound leakage of the acoustic output unit 4910, at least one through hole (also called a "sound leakage reduction hole") that communicates the housing cavity of the housing 4911 with the outside of the acoustic output unit 4910 may be further formed in the housing 4911.

[0164] In some embodiments, the acoustic output unit 4910 may further include a face contact cover (not shown) connected to the panel 4913. The face contact cover contacts the user's skin, that is, the panel 4913 can contact the user's skin through the face contact cover. The Shore hardness of the face contact cover may be smaller than the Shore hardness of the panel 4913, that is, the face contact cover may be softer than the panel 4913. For example, the material of the face contact cover may be a soft material such as silica gel, and the material of the panel 4913 may be a hard material such as polycarbonate or glass fiber reinforced plastic. In this way, the wearing comfort of the acoustic output unit 4910 can be improved, the acoustic output unit 4910 can be fitted to the user's skin, and the sound quality of the acoustic output unit 4910 can be improved. In some embodiments, the face contact cover may be removably connected to the panel 4913 so that the user can easily replace it. For example, the face contact cover may be externally fitted to the panel 4913.

[0165] As shown in FIG. 49A, the transducer device 4912 may include a bracket 49121, a vibration transmission sheet 49122, a magnetic circuit assembly 49123, and a coil 49124. In some embodiments, the panel 4913 may be connected to the bracket 49121. For example, as shown in FIG. 49A, the bracket 49121 may be connected to the end of the connection rod 49131 away from the panel 4913. The bracket 49121 may be connected to the magnetic circuit assembly 49123 by the vibration transmission sheet 49122 so as to suspend the magnetic circuit assembly 49123 in the accommodation cavity of the housing 4911. In some embodiments, the vibration damping sheet 4914 may connect the bracket 49121 and the housing 4911 so as to suspend the transducer device 4912 in the accommodation cavity of the housing 4911. The coil 49124 may be inserted into the magnetic gap of the magnetic circuit assembly 49123 along the vibration direction of the transducer device 4912.

[0166] In some embodiments, the magnetic circuit assembly 49123 may include a magnet assembly 491231 and a magnetic flux conducting cover 491232. The magnetic flux conducting cover 491232 may be externally fitted to the coil 49124, the magnet assembly 491231 may be installed within the coil 49124, the magnetic flux conducting cover 491232 and the magnet assembly 491231 are installed at intervals in a direction perpendicular to the vibration direction, and the magnetic gap is formed between the inner wall of the magnetic flux conducting cover 491232 and the outside of the magnet assembly 491231. In some embodiments, the coil 49124 may be externally fitted to the outside of the magnet assembly 491231 around an axis parallel to the vibration direction of the transducer device 4912. In some embodiments, the magnetic flux conducting cover 491232 of the magnetic circuit assembly 49123 is externally fitted to the outside of the coil 49124 around an axis parallel to the vibration direction of the transducer device 4912, that is, the magnetic flux conducting cover 491232 and the magnet assembly 491231 are installed at intervals in a direction perpendicular to the vibration direction of the transducer device 4912. Specifically, the coil 49124 may be connected to the magnetic flux conducting cover 491232. In some embodiments of the present application, the coil 49124 fits to the inner wall of the magnetic flux conducting cover 491232. In some embodiments, the vibration transmission sheet 49122 may be connected between the magnetic flux conducting cover 491232 and the magnet assembly 491231 and can elastically support the magnet assembly 491231. For example, the vibration transmission sheet 49122 and the magnetic circuit assembly 49123 are arranged along the vibration direction, and a side surface of the vibration transmission sheet 49122 perpendicular to the vibration direction may be connected to an end portion of the magnetic flux conducting cover 491232 perpendicular to the vibration direction so as to realize the fixation of the magnetic circuit assembly 49123. In other embodiments of the present application, it can be understood that the periphery of the vibration transmission sheet 49122 may be connected to the inner wall or other positions of the magnetic flux conducting cover 491232 of the magnetic circuit assembly 49123 so as to realize the fixation of the magnetic flux conducting cover 491232.

[0167] In some embodiments, the coil 49124 may include a first coil 491241 and a second coil 491242. In some embodiments, the first coil 491241 and the second coil 491242 may be spaced apart along the vibration direction of the transducer device 4912. The first coil 491241 may be inserted into the magnetic gap of the magnetic circuit assembly 49123 from the side close to the panel 4913 along the vibration direction, and the second coil 491242 may be inserted into the magnetic gap of the magnetic circuit assembly 49123 from the side away from the panel 4913 along the vibration direction. In some embodiments, in order to simplify the assembly process, the first coil 491241 and the second coil 491242 may be inserted together into the magnetic gap of the magnetic circuit assembly 49123 from the side close to the panel 4913. In some embodiments, the transducer device 4912 may further include a holding portion for holding the shapes of the first coil 491241 and the second coil 491242. For example, the first coil 491241 and the second coil 491242 may have an integral structure. Specifically, the first coil 491241 and the second coil 491242 are wound around a shape-retaining material and further adhered to the outside of the first coil 491241 and the second coil 491242 using a holding portion (such as a holding material like a high-temperature tape) to form an integral structure. Since the first coil 491241 and the second coil 491242 fixed to the holding portion extend into the magnetic gap of the magnetic circuit assembly 49123 from the same side of the panel 4913, the assembly process of the coil 49124 is simplified. In some embodiments, the two coils are formed by winding the same wire, or a part of the two coils is connected, so that the lead wires of the two coils are only two lead wires, which facilitates wiring and can facilitate the electrical connection with other subsequent structures.

[0168] In some embodiments, the vibration transmission sheet 49122 (also referred to as an elastic support member) may include a first vibration transmission sheet 49125 and a second vibration transmission sheet 49126. The first vibration transmission sheet 49125 may include a central region 491252, an edge region 491253 distributed along its peripheral side, and support rods 491251 connecting the two. The second vibration transmission sheet 49126 may include a central region 491262, an edge region 491263 distributed along its peripheral side, and support rods connecting the two. In the vibration direction of the transducer device 4912, the first vibration transmission sheet 49125 and the second vibration transmission sheet 49126 may elastically support the magnet assembly 491231 from both opposite sides of the magnet assembly 491231. Thus, in the embodiments of this specification, the magnet assembly 491231 is elastically supported on both opposite sides in the vibration direction of the transducer device 4912, without abnormal vibrations such as significant shaking. Thus, it is advantageous for improving the vibration stability of the transducer device 4912.

[0169] Exemplarily, as shown in FIG. 49A, in the vibration direction, the edge regions 491253 on both opposite sides of the first vibration transmission sheet 49125 are respectively connected to the side close to the magnetic circuit assembly 49123 of the bracket 49121 and the side close to the bracket 49121 of the magnetic flux conduction cover 491232. The edge region 491263 of the second vibration transmission sheet 49126 is connected to the side away from the bracket 49121 of the magnetic flux conduction cover 491232. In some embodiments, the magnetic flux conduction cover 491232 may be a cylindrical structure with both ends open (e.g., shown in FIGS. 49A and 49B), a bowl-shaped structure with one end open (e.g., shown in FIG. 54D), etc. In some embodiments, by forming holes in the magnetic flux conduction cover 491232 (for example, forming holes in the side wall of the cylindrical magnetic flux conduction cover (e.g., shown in FIG. 54C), forming holes in the bottom and side surfaces of the bowl-shaped magnetic flux conduction cover respectively or all of them (e.g., shown in FIG. 54D), etc.), the acoustic cavity effect of the magnetic circuit assembly 49123 can be reduced, and the sound leakage of the acoustic output device 4900 can be reduced. In some embodiments, the magnetic flux conduction cover 491232 may be a sealed structure so that the sound generated in the magnetic circuit assembly 49123 does not leak to the outside. FIG. 49B is a schematic configuration diagram of the magnetic flux conduction cover 491232 according to some embodiments of the present specification. As shown in FIG. 49B, at both ends along the vibration direction of the transducer device, the cover plates 491232-1 and 491232-2 can seal the cylindrical structure with both ends open to form the sealed magnetic flux conduction cover 491232. It can be understood that the cover plate is only an example, and the two ends along the vibration direction of the cylindrical structure with both ends open can also be sealed by other methods (such as a cover film, etc.) to form the sealed magnetic flux conduction cover 491232. In some other embodiments where the requirement for the concentration of the magnetic field generated by the magnet assembly 491231 is not very high, the magnetic flux conduction cover 491232 may be replaced by a non-magnetic member such as a plastic bracket.Based on this, the edge region 491253 of the first vibration transmission sheet 49125 and the edge region 491263 of the second vibration transmission sheet 49126 may be respectively connected to both ends of the plastic bracket.

[0170] In some embodiments, the magnet assembly 491231 may include a magnet 491233 and a magnetic flux conduction plate. In some embodiments, the magnet 491233 and the magnetic flux conduction plate are installed along the vibration direction of the transducer device 4912. In some embodiments, the magnetic flux conduction plate may be installed on one or both sides of the magnet 491233 in the vibration direction of the transducer device 4912. In some embodiments, the magnetic flux conduction plate may include a first magnetic flux conduction plate 491234 and a second magnetic flux conduction plate 491235 located on both sides facing away from the magnet 491233 in the vibration direction of the transducer device 4912. The first vibration transmission sheet 49125 can support the magnet assembly 491231 from the side away from the second magnetic flux conduction plate 491235 of the first magnetic flux conduction plate 491234, and the second vibration transmission sheet 49126 can support the magnet assembly 491231 from the side away from the first magnetic flux conduction plate 491234 of the second magnetic flux conduction plate 491235. For example, the central region 491252 of the first vibration transmission sheet 49125 is connected to the side away from the second magnetic flux conduction plate 491235 of the first magnetic flux conduction plate 491234, and the central region 491262 of the second vibration transmission sheet 49126 is connected to the side away from the first magnetic flux conduction plate 491234 of the second magnetic flux conduction plate 491235. In some embodiments, the corners of the magnetic flux conduction plate (e.g., the first magnetic flux conduction plate 491234 and / or the second magnetic flux conduction plate 491235) away from the magnet 491233 may be chamfered. For example, by chamfering the corners on both sides facing away from each other (i.e., the corners away from the magnet 491233) of the first magnetic flux conduction plate 491234 and the second magnetic flux conduction plate 491235, the distribution of the magnetic field formed by the magnetic circuit assembly 49123 can be adjusted, and the magnetic field can be made more concentrated.In some embodiments, in the vibration direction of the transducer device 4912, the position at half the height of the first coil 491241 and the position at half the thickness of the side parallel to the vibration direction of the first magnetic flux conduction plate 491234 may be at the same height. The position at half the height of the second coil 491242 and the position at half the thickness of the side parallel to the vibration direction of the second magnetic flux conduction plate 491235 may be at the same height. In this way, the magnetic field can be intensively distributed in the rectangular portion other than the chamfered portion in the first magnetic flux conduction plate 491234 and / or the second magnetic flux conduction plate 491235. FIG. 49C is a schematic position diagram of an exemplary first magnetic flux conduction plate 491234 and a first coil 491241 according to some embodiments of the present specification. As shown in FIG. 49C, along the vibration direction of the transducer device 4912, the position H1 at half the height of the first coil 491241 and the position H2 at half the thickness of the side 491234-1 parallel to the vibration direction of the first magnetic flux conduction plate 491234 are at the same height and are both on the contour line L. In some embodiments, in order to simplify the manufacture of the magnetic flux conduction plate (for example, the first magnetic flux conduction plate 491234 and / or the second magnetic flux conduction plate 491235), the corners of the magnetic flux conduction plate (for example, the first magnetic flux conduction plate 491234 and / or the second magnetic flux conduction plate 491235) away from the magnet 491233 may be right angles. For example, chamfering may not be performed on the opposite side corners (i.e., the corners away from the magnet 491233) of the first magnetic flux conduction plate 491234 and the second magnetic flux conduction plate 491235. In this case, along the vibration direction of the transducer device 4912, the position at half the height of the first coil 491241 and the position at half the thickness of the first magnetic flux conduction plate 491234 may be at the same height, and the position at half the height of the second coil 491242 and the position at half the thickness of the second magnetic flux conduction plate 491235 may be at the same height. In this way, the magnetic field can be intensively distributed in the first magnetic flux conduction plate 491234 and / or the second magnetic flux conduction plate 491235.For the first magnetic flux conduction plate 491234 and the second magnetic flux conduction plate 491235 that have been chamfered, the thicknesses of the first magnetic flux conduction plate 491234 and the second magnetic flux conduction plate 491235 that have not been chamfered may be smaller so as to achieve the purpose of reducing the weight and volume of the entire transducer device 4912.

[0171] In some embodiments, the magnetic flux conduction cover 491232 may be connected to the bracket 49121 and the bracket 49121 may be connected to the housing 4911 by the vibration damping sheet 4914 so that the transducer device 4912 is suspended in the accommodation cavity of the housing 4911. In this case, as shown in FIG. 49A, both end portions perpendicular to the vibration direction of the edge region 491253 of the first vibration transmission sheet 49125 are connected to the bracket 49121 and the magnetic flux conduction cover 491232, both end portions perpendicular to the vibration direction of the edge region 491263 of the second vibration transmission sheet 49126 are connected to the magnetic flux conduction cover 491232, and the panel 4913 may be connected to the bracket 49121 and not connected to the open end of the housing 4911.

[0172] In some embodiments, if the rigidity of the vibration damping sheet 4914 is too low, it is difficult for the magnetic circuit assembly 49123 to be stably suspended in the housing 4911 by the vibration damping sheet 4914. Thus, when the transducer device 4912 vibrates, the stability tends to deteriorate. Conversely, if the rigidity of the vibration damping sheet 4914 is too high, the vibration of the transducer device 4912 is likely to be transmitted to the housing 4911 by the vibration damping sheet 4914. Thus, the sound leakage of the acoustic output unit 4910 tends to be excessive. In some embodiments, in order to ensure good stability when the transducer device 4912 vibrates and reduce the sound leakage of the acoustic output unit 4910, the ratio of the rigidity of the vibration damping sheet 4914 to the rigidity of the first vibration transmission sheet 49125 (or the second vibration transmission sheet 49126) may be in the range of 0.1 to 5. For the specific structure of the vibration transmission sheet (for example, the first vibration transmission sheet 49125, the second vibration transmission sheet 49126), reference can be made to the content in other parts of the specification of the present application, for example, FIGS. 46 and 47 and their related descriptions.

[0173] FIG. 50 is a schematic configuration diagram of the acoustic output unit 4910 according to some embodiments of the present specification. As shown in FIG. 50, the acoustic output unit 4910 of this embodiment is basically the same as the embodiment shown in FIG. 49A. The main difference is that in this embodiment, the magnetic flux conduction cover 491232 is installed so as to be rigidly connected to the housing 4911 or the panel 4913, that is, in this embodiment, the vibration damping sheet 4914 may not be present. Further, in this embodiment, by fitting the magnetic flux conduction cover 491232 to the inner wall of the housing 4911, it is advantageous for fully utilizing the internal space of the housing 4911 and realizing miniaturization of the acoustic output unit 4910. In other embodiments of the present application, it can be understood that the magnetic flux conduction cover 1232 may achieve rigid connection with the housing 4911 or the panel 4913 by other fixing structures. In some embodiments, any one of the edge regions (for example, the edge region 491253 or the edge region 491263) of the first vibration transmission sheet 49125 and the second vibration transmission sheet 49126 may be connected to the open end of the housing 4911 by one or a combination of assembly methods such as attachment and adhesion. The panel 4913 is connected to the open end of the housing 4911 to form a sealed cavity. In some embodiments, the side surface of any one of the first vibration transmission sheet 49125 and the second vibration transmission sheet 49126 close to the panel 4913 is connected to the panel 4913, and the panel 4913 is connected to the open end of the housing 4911. In some embodiments, the panel 4913 and the housing 4911 may be made of the same material and integrally formed. In some embodiments, the panel 4913 and the housing 4911 may be made of different materials and connected by one or a combination of assembly methods such as attachment and adhesion.

[0174] In some embodiments, the acoustic output unit 4910 may further include additional elements, which may be installed in the accommodation cavity of the housing 4911 or fit outside the housing 4911. In some embodiments, the additional elements may include vibration-sensitive elements and vibration-insensitive elements. By way of merely illustrative explanation, the vibration-sensitive elements may include air-conduction speakers, acceleration sensors, etc. The vibration-insensitive elements may include batteries, circuit boards, etc. The battery may be used to supply power to the acoustic output unit 4910 so that the acoustic output unit 4910 can operate. A signal processing circuit for processing electrical signals may be integrated on the circuit board. In some embodiments, the signal processing may include frequency modulation processing, amplitude modulation processing, filtering processing, noise reduction processing, etc. The air-conduction speaker converts an electrical signal into a vibration signal (sound wave), which is transmitted to the auditory nerve by air and can be sensed by the user. The acceleration sensor may be used to measure the vibration acceleration of the panel 4913. For the description of the installation of the air-conduction speaker and the acceleration sensor, reference may be made to the following, for example, the description of FIGS. 51 to 56.

[0175] In various embodiments shown in FIGS. 49A and 50, the acoustic output unit 4910 may be a bone-conduction speaker. Hereinafter, with reference to FIGS. 4 to 56 and the like, various embodiments in which the acoustic output device 4900 can be implemented as a bone-conduction speaker or bone-conduction earphone will be described.

[0176] FIG. 51 is a schematic configuration diagram of an acoustic output unit 4910 according to some embodiments of the present specification. The acoustic output unit 4910 shown in FIG. 51 is basically the same as the acoustic output unit 4910 shown in FIG. 49A. The main difference is that the additional element of the acoustic output unit 4910 includes an air-conduction speaker, and the air-conduction speaker is installed in the accommodation cavity of the housing 4911. As shown in FIG. 51, the acoustic output unit 4910 includes a transducer device 4912 and a housing 4911 that houses the transducer device 4912. The transducer device 4912 includes a magnetic circuit assembly 49123 (including a magnetic flux conduction cover 491232 and a magnet assembly 491231), a coil 49124 (including a first coil 491241 and a second coil 491242), and a vibration transmission sheet 49122 (including a first vibration transmission sheet 49125 and a second vibration transmission sheet 49126). The coil 49124 is installed in the magnetic circuit assembly 49123 so that the magnetic field of the magnetic circuit assembly 49123 passes through the coil 49124. The first vibration transmission sheet 49125 and the second vibration transmission sheet 49126 elastically support the magnet assembly 491231. The air-conduction speaker includes a diaphragm 4915 connected between the magnet assembly 491231 and the housing 4911. The diaphragm 4915 partitions the internal space of the housing 4911 (i.e., the above accommodation cavity) into a front cavity 49111 close to the skin contact area (e.g., panel 4913) and a rear cavity 49112 away from the skin contact area. In other words, when the user wears the acoustic output unit 4910, the front cavity 49111 is closer to the user than the rear cavity 49112. In some embodiments, the housing 4911 is provided with a sound-emitting hole 49113 communicating with the rear cavity 49112. The diaphragm 4915 can generate air-conducted sound transmitted to the user's ear through the sound-emitting hole 49113 during the process of relative movement between the transducer device 4912 and the housing 4911. In this way, the sound generated in the rear cavity 49112 is transmitted through the sound-emitting hole 49113 and acts on the user's eardrum by air, so that the user can also hear the air-conducted sound through the acoustic output unit 4910.

[0177] In some embodiments, the diaphragm 4915 of the air-conduction speaker is connected between the magnet assembly 491231 and the housing 4911 of the transducer device 4912, and the vibration direction of the diaphragm 4915 is parallel to the vibration direction of the transducer device 4912. As shown in FIG. 51, when the transducer device 4912 is moved in a direction approaching the user's face in the skin contact area, it can be easily considered that the bone-conduction sound is enhanced. At the same time, the portion of the housing 4911 corresponding to the skin contact area moves in a direction approaching the user's face, and the magnet assembly 491231 moves in a direction away from the user's face due to the relationship of action and reaction forces, so that the air in the rear cavity 49112 is compressed, the air pressure increases, and as a result, the sound transmitted through the sound-emitting hole 49113 is enhanced, and it can be easily considered that the air-conduction sound is enhanced. Therefore, the bone-conduction sound and the air-conduction sound of the acoustic output unit 4910 can be enhanced simultaneously, and accordingly, when the bone-conduction sound attenuates, the air-conduction sound also attenuates. Based on this, the bone-conduction sound and the air-conduction sound generated by the acoustic output unit 4910 have the characteristic that their phases are the same. Further, when the front cavity 49111 is a sealed cavity, since the front cavity 49111 and the rear cavity 49112 are substantially partitioned by structural members such as the diaphragm 4915 and the transducer device 4912, the change pattern of the air pressure in the front cavity 49111 is exactly opposite to the change pattern of the air pressure in the rear cavity 49112. In some embodiments, the housing 4911 may be provided with a decompression hole communicating with the front cavity 49111 so that the front cavity 49111 can communicate with the external environment, that is, air can freely enter and exit the front cavity 49111, or the front cavity 49111 may be installed to be open. In this way, the change in the air pressure in the rear cavity 49112 can be prevented from being inhibited by the front cavity 49111 as much as possible, thereby effectively improving the acoustic expressiveness of the air-conduction sound generated by the acoustic output unit 4910.In some embodiments, the decompression hole installed in the front cavity 49111 may be offset from the sound emission hole 49113 installed in the rear cavity 49112, that is, the two may not be adjacent to each other. For example, the decompression hole is installed on one side of the housing 4911, and the sound emission hole 49113 is installed on the other side of the housing 4911 relative to the decompression hole, thereby avoiding the sound cancellation phenomenon caused by the opposite phases of the two as much as possible.

[0178] In some embodiments, in order to avoid the air-conduction speaker resonating under the influence of the vibration of the transducer device 4912 and generating an acoustic leakage peak, the air-conduction vibration direction of the air-conduction speaker is made different from the vibration direction of the transducer device 4912 (i.e., the bone-conduction vibration direction), and the mutual influence in the same direction can be prevented. FIG. 5 is a schematic configuration diagram of an acoustic output unit 4910 according to some embodiments of the present specification. As shown in FIG. 5, an air-conduction speaker 4916 is installed on the side wall of the housing 4911. The air-conduction speaker 4916 is connected to the transducer device 4912, and the transducer device 4912 and the housing 4911 in the acoustic output unit 4910 form a bone-conduction speaker, and the bone-conduction speaker, in combination with the air-conduction speaker 4916, forms a bone-air-conduction speaker. In some embodiments, the air-conduction vibration direction of the air-conduction speaker 4916 is different from the vibration direction of the transducer device 4912 (i.e., the bone-conduction vibration direction). In some embodiments, the vibration direction of the transducer device 4912 may be installed substantially perpendicular to the air-conduction vibration direction of the air-conduction speaker 4916. For example, the vibration direction of the transducer device 4912 may be installed substantially perpendicular to the vibration direction of the diaphragm of the air-conduction speaker 4916 so as to reduce the acoustic leakage of the air-conduction speaker. The "substantially perpendicular" described in the present specification means that the included angle between the corresponding two parts is within the range of 90° ± 20°. For example, the included angle between the vibration direction of the transducer device 4912 and the air-conduction vibration direction (or the diaphragm of the air-conduction speaker 4916) of the air-conduction speaker 4916 is within the range of 90° ± 20°. For example, the vibration direction of the transducer device 4912 may be installed perpendicular to the diaphragm of the air-conduction speaker 4916. In some embodiments, in order to avoid an electromagnetic field being generated between the bone-conduction speaker and the electromagnetic assembly of the air-conduction speaker 4916 and affecting the vibration output of the bone-conduction speaker and the air-conduction speaker 4916, the distance between the bone-conduction speaker and the air-conduction speaker 4916 may be greater than a distance threshold. The "distance between the bone-conduction speaker and the air-conduction speaker 4916" described in the present specification means the minimum distance between the magnetic assembly of the bone-conduction speaker and the magnetic assembly of the air-conduction speaker 4916.FIG. 52B is a comparison diagram of the influence of different distances between the bone conduction speaker according to some embodiments of the present application and the air conduction speaker 4916 on the magnetic field of the coil. As shown in FIG. 52B, when the air conduction speaker 4916 shown in FIG. 52A is magnetized to the right and the magnet assembly 491231 in the transducer device 4912 is magnetized upward, it causes an increase in the average magnetic field strength at the coil 1 located above in the transducer device 4912 and a decrease in the average magnetic field strength at the coil 2 located below. As the distance between the transducer device 4912 of the bone conduction speaker and the air conduction speaker 4916 increases, the magnets tend to disappear from the sides of the coil 1 and the coil 2. Therefore, the greater the distance between the transducer device 4912 of the bone conduction speaker and the air conduction speaker 4916, the smaller the influence on the magnetic field of the coil in the transducer device 4912. In some embodiments, in order to reduce the influence on the magnetic field in the coil of the electromagnetic field generated between the electromagnetic assemblies of the bone conduction speaker and the air conduction speaker 4916, the distance between the bone conduction speaker and the air conduction speaker 4916 may be greater than 0.3 mm. For example, the distance between the bone conduction speaker and the air conduction speaker 4916 may be greater than 0.4 mm.

[0179] In some embodiments, in order to avoid the influence of the vibration of the transducer device 4912 when the acceleration sensor measures the acceleration of the panel 4913, the vibration direction of the transducer device 4912 may be substantially perpendicular to the vibration sensitive end of the acceleration sensor.

[0180] In addition, when the additional element is a vibration-sensitive element such as an air-conduction speaker or an acceleration sensor, in order to avoid the vibration-sensitive element being affected by the vibration of the transducer device, the vibration-sensitive element is substantially perpendicular to the vibration direction of the transducer device 4912. As used herein, "the vibration-sensitive element is substantially perpendicular to the vibration direction of the transducer device 4912" means that when the vibration-sensitive element is an air-conduction speaker, the vibration direction of the transducer device 4912 is substantially perpendicular to the vibration direction of the vibration diaphragm of the air-conduction speaker; when the vibration-sensitive element is an acceleration sensor, the vibration direction of the transducer device 4912 is substantially perpendicular to the vibration-sensitive end of the acceleration sensor. When the additional element is a vibration-insensitive element such as a battery or a circuit board, the battery or the circuit board may be disposed at any position within the housing 4911 in order to realize the integrated design of the acoustic output device 4900.

[0181] In some embodiments, the additional element may include a vibration-sensitive element and a vibration-insensitive element. It can be understood that the vibration-sensitive element may be substantially perpendicular to the vibration direction of the transducer device 4912. For example, in some embodiments, the additional element includes an acceleration sensor sensitive to vibration and a circuit board insensitive to vibration. The acceleration sensor is installed on the circuit board and is housed within the housing of the acoustic output unit 4910 in order to realize the integration of the acoustic output device. In this case, the acceleration sensor may be substantially perpendicular to the vibration direction of the transducer device 4912.

[0182] FIG. 53 is a schematic configuration diagram of a transducer device 4912 according to some embodiments of the present specification. FIG. 54A is an exploded view of the transducer device 4912 according to some embodiments of the present specification. The transducer device 4912 shown in FIGS. 53 and 54A may be used in any of the acoustic output units 4910 shown in FIGS. 49A to 52A. As shown in FIGS. 53 and 54A, the transducer device 4912 may include a vibration transmission sheet 49122, a magnetic circuit assembly 49123, and a coil 49124. The magnetic circuit assembly 49123 includes a magnet assembly 491231 and a magnetic flux conduction cover 491232, and the magnet assembly 491231 may include a magnet 491233, a first magnetic flux conduction plate 491234, and a second magnetic flux conduction plate 491235 located on both sides of the magnet 491233 facing away from each other in the vibration direction of the transducer device 4912. In some embodiments, the magnetic flux conduction cover 491232 may be installed outside the magnet assembly 491231 around an axis. The coil 49124 may be within the magnetic field range of the magnet assembly 491231. In some embodiments, the coil 49124 may be inserted into a magnetic gap formed between the magnetic flux conduction cover 491232 and the magnet assembly 491231 along the vibration direction of the transducer device 4912, and the magnetic flux conduction cover 491232 may be externally fitted outside the coil 49124. In some embodiments, the inner wall of the magnetic flux conduction cover 491232 may fit the outer wall of the coil 49124. In some embodiments, the vibration transmission sheet 49122 may include a first vibration transmission sheet 49125 and a second vibration transmission sheet 49126. The first vibration transmission sheet 49125 elastically supports the magnet assembly 491231 from the side away from the second magnetic flux conduction plate 491235 of the first magnetic flux conduction plate 491234, and the second vibration transmission sheet 49126 elastically supports the magnet assembly 491231 from the side away from the first magnetic flux conduction plate 491234 of the second magnetic flux conduction plate 491235.For example, the edge region 491253 of the first vibration transmission sheet 49125 is connected to one end of the transducer device 4912 of the magnetic flux conduction cover 491232 along the vibration direction, and the edge region 491263 of the second vibration transmission sheet 49126 is connected to the other end of the transducer device 4912 of the magnetic flux conduction cover 491232 along the vibration direction.

[0183] In some embodiments, in order to facilitate the wiring of the lead wires of the coil 49124 and make the incoming and outgoing wires of the coil 49124 at the same position of the magnetic flux conduction cover 491232, the number of coils of the coil 49124 along the radial direction of the transducer device 4912 may be an even number. For example, the number of turns of the coil in the radial direction is 2, 4, 6, 8, etc. As shown in FIG. 53, the radial direction of the transducer device 4912 is a direction perpendicular to the axis of the transducer device 4912 (or the vibration direction of the transducer device 4912).

[0184] In some embodiments, the coil 49124 may include a first coil 491241 and a second coil 491242. In some embodiments, the first coil 491241 and the second coil 491242 may be distributed at intervals along the vibration direction of the transducer device 4912. The first coil 491241 and the second coil 491242 are connected in series or in parallel. For the first coil 491241 and the second coil 491242 connected in series or in parallel, in order to facilitate the wiring of the lead wires of the first coil 491241 and the second coil 491242, the incoming wire position of each coil and the outgoing wire position of the coil are both at the same position of the magnetic flux conducting cover 491232. The incoming wire position of the first coil 491241 and the outgoing wire position of the first coil 491241 may both be at the same position of the magnetic flux conducting cover 491232, and the incoming wire position of the second coil 491242 and the outgoing wire position of the second coil 491242 may both be at the same position of the magnetic flux conducting cover 491232. For example, the incoming wire position of the first coil 491241, the outgoing wire position of the first coil 491241, the incoming wire position of the second coil 491242, and the outgoing wire position of the second coil 491242 may all be at the middle position of the magnetic flux conducting cover 491232 (for example, the middle of the magnetic flux conducting cover 491232 in the direction perpendicular to the vibration direction of the transducer device 4912). In some embodiments, the winding directions of the first coil 491241 and the second coil 491242 may be opposite, and the directions of the currents in the first coil 491241 and the second coil 491242 may be opposite. The transducer device 4912 vibrates relatively by driving the dual coil (that is, the coil 49124 includes the first coil 491241 and the second coil 491242), and compared with the single voice coil, the magnitude of the vibration of the transducer device 4912 can be increased. In some embodiments, by using the dual coil structure, a lower high-frequency impedance can be realized. FIG. 54B is a comparison diagram of the impedances of the transducer device 4912 with a single voice coil structure and a dual voice coil structure according to some embodiments of the present application.As shown in FIG. 54B, compared with the single voice coil structure, the high-frequency impedance of the dual voice coil is lower.

[0185] In some embodiments, if the impedance is too small, the current increases at the same battery supply voltage, so more power is consumed, and the battery life is shortened with the same battery capacity. On the other hand, if the battery cannot output the increased current, clipping distortion occurs. If the impedance is too large, the current decreases at the same battery supply voltage, and the sensitivity decreases, which appears as a decrease in volume. Therefore, in order to balance battery life, distortion, sensitivity, and volume, the overall DC impedance of coil 49124 may be in the range of 6Ω to 10Ω. In some embodiments, the first coil 491241 and the second coil 491242 in the transducer device 4912 can be designed according to the following requirements.

[0186] First, in order to ensure that the overall DC impedance of coil 49124 composed of the first coil 491241 and the second coil 491242 is in the range of 6Ω to 10Ω, the range of the DC impedance of the single coil (the first coil 491241 and the second coil 491242) may vary depending on different connection methods (series connection or parallel connection). For example, in order to ensure that the overall DC impedance of coil 49124 is 8Ω, when the two coils are connected in series, the DC impedance of the single coil (the first coil 491241 and the second coil 491242) is 4Ω, and when the two coils are connected in parallel, the DC impedance of the single coil (the first coil 491241 and the second coil 491242) is 16Ω.

[0187] Next, in order to reduce the mass of the entire acoustic output unit 4910 as much as possible, the volume of the magnetic flux conduction cover 491232 is reduced to further reduce the mass of the magnetic flux conduction cover 491232. The inner wall of the magnetic flux conduction cover 491232 and the outer wall of the coil 49124 (including the first coil 491241 and the second coil 491242) are fitted. On the premise that the interval along the vibration direction of the transducer device 4912 between the first coil 491241 and the second coil 491242 is within the range of 1.5 mm to 2 mm, the shape of the coil 49124 (including the first coil 491241 and the second coil 491242) may be made "elongated", that is, the axial height of the coil 49124 is increased and the radial width of the coil 49124 is decreased. In this case, the inner diameter of the magnetic flux conduction cover 491232 also decreases, and the outer diameter of the magnetic flux conduction cover 491232 decreases simultaneously while the thickness of the magnetic flux conduction cover 491232 remains unchanged, whereby the mass of the magnetic flux conduction cover 491232 and the mass of the entire acoustic output unit 4910 can be reduced accordingly. In some embodiments, by designing parameters such as the wire diameter, the number of turns in the radial direction, and the number of turns in the axial direction of the coil 49124 (including the first coil 491241 and the second coil 491242), the shape of the coil 49124 (including the first coil 491241 and the second coil 491242) can be made "elongated" to meet the above requirements. In some embodiments, in order to make the shape of the coil 49124 (including the first coil 491241 and the second coil 491242) "elongated", the ratio of the axial height to the radial width of the first coil or the second coil may be 3 or more. For example, the ratio of the axial height to the radial width of the first coil or the second coil may be 3.5 or more.

[0188] Furthermore, since the axial height of the transducer device 4912 is mainly limited by the dimensions of the internal magnet assembly 491231, in order to meet the dimensional requirements of the transducer device 4912 (for example, when the acoustic output device 4900 is an earphone, to meet the requirement that the height of the acoustic output unit 4910 in the earphone is less than 5.7 mm), the axial height of the single coil (the first coil 491241 and / or the second coil 491242) may be set to be less than 2.85 mm. For example, the axial height of the single coil (the first coil 491241 and / or the second coil 491242) may be about 2 mm.

[0189] To meet the above requirements, in some embodiments, the first coil 491241 and the second coil 491242 may be connected in series. In order to make the overall DC impedance of the coil 49124 within the range of 6Ω to 10Ω, the DC impedance of the first coil 491241 and / or the second coil 491242 may be within the range of 4Ω ± 1Ω. For example, in order to meet the requirement that the overall DC impedance of the coil 49124 is within the range of 7Ω to 9Ω, the DC impedance of the first coil 491241 and / or the second coil 491242 may be within the range of 3.5Ω to 4.5Ω. Also for example, in order to meet the requirement that the overall DC impedance of the coil 49124 is within the range of 8Ω ± 0.8Ω, the DC impedance of the first coil 491241 and / or the second coil 491242 may be within the range of 4Ω ± 0.4Ω. In some embodiments, the wire diameters of the first coil 491241 and the second coil 491242 may be within the range of 0.11 mm to 0.13 mm.

[0190] To meet the above requirements, in some embodiments, the first coil 491241 and / or the second coil 491242 may satisfy one of the following characteristics: the wire diameter is 0.11 mm, the number of radial windings is 2 to 6 times, and the number of axial layers is 8 to 20 layers; the wire diameter is 0.12 mm, the number of radial windings is 2 to 6 times, and the number of axial layers is 9 to 20 layers; the wire diameter is 0.13 mm, the number of radial windings is 2 to 6 times, and the number of axial layers is 10 to 22 layers. For example, the first coil 491241 and / or the second coil 491242 may have a wire diameter of 0.11 mm, the number of radial windings is 3 to 5 times, and the number of axial layers is 12 to 20 layers. Also for example, the first coil 491241 and / or the second coil 491242 may have a wire diameter of 0.12 mm, the number of radial windings is 3 to 5 times, and the number of axial layers is 14 to 20 layers. Further for example, the first coil 491241 and / or the second coil 491242 may have a wire diameter of 0.13 mm, the number of radial windings is 3 to 4 times, and the number of axial layers is 15 to 22 layers.

[0191] In some embodiments, the relationships between the wire diameter, the number of radial windings, the number of axial layers, and the DC impedance of the single coils (the first coil 491241 and / or the second coil 491242) connected in series are shown in Table 1.

[0192]

Table 1

[0193] According to Table 1, in order to make the DC impedance of the single coil (the first coil 491241 or the second coil 491242) within the range of 4Ω ± 1Ω and make the number of radial coils even, the exemplary first coil 491241 and / or the second coil 491242 may have a wire diameter of 0.11mm, a radial winding number of 4 turns, and an axial layer number of 12 layers. In this case, the first coil 491241 and / or the second coil 491242 has a DC impedance of 4Ω. Also, for example, it may have a wire diameter of 0.12mm, a radial winding number of 4 turns, and an axial layer number of 14 layers. In this case, the first coil 491241 and / or the second coil 491242 has a DC impedance of 3.93Ω. Further, for example, it may have a wire diameter of 0.12mm, a radial winding number of 4 turns, and an axial layer number of 15 layers. In this case, the first coil 491241 and / or the second coil 491242 has a DC impedance of 4Ω. Further, for example, it may have a wire diameter of 0.13mm, a radial winding number of 4 turns, and an axial layer number of 18 layers. In this case, the first coil 491241 and / or the second coil 491242 has a DC impedance of 4.08Ω.

[0194] In some embodiments, the first coil 491241 and the second coil 491242 may be connected in parallel. In order to ensure that the overall DC impedance of the coil 49124 is within the range of 6Ω to 10Ω, the DC impedance of the first coil 491241 and / or the second coil 491242 is respectively within the range of 12Ω to 20Ω. For example, in order to satisfy that the overall DC impedance of the coil 49124 is within the range of 8Ω ± 0.8Ω, the DC impedance of the first coil 491241 and / or the second coil 491242 may be within the range of 16Ω ± 1.6Ω. In some embodiments, the wire diameters of the first coil 491241 and the second coil 491242 may be within the range of 0.07mm to 0.08mm.

[0195] To meet the above requirements, in some embodiments, the first coil 491241 and / or the second coil 491242 may have a radial winding number of 4 to 8 turns and an axial layer number of 16 to 22 layers. For example, the first coil 491241 and / or the second coil 491242 may have a radial winding number of 4 to 6 turns and an axial layer number of 17 to 20 layers.

[0196] In some embodiments, in order to make the DC impedance of a single coil (the first coil 491241 or the second coil 491242) within the range of 16 Ω ± 1.6 Ω and make the number of radial coils even, the wire diameter, radial winding number, axial layer number, and DC impedance of exemplary parallel-connected single coils (the first coil 491241 and / or the second coil 491242) are shown in Table 2. For example, the parallel-connected single coils (the first coil 491241 and / or the second coil 491242) may have a wire diameter of 0.08 mm, a radial winding number of 6, an axial layer number of 17, and a corresponding DC impedance of 16.16 Ω. Also for example, the parallel-connected single coils (the first coil 491241 and / or the second coil 491242) may have a wire diameter of 0.07 mm, a radial winding number of 4, an axial layer number of 20, and a corresponding DC impedance of 16.27 Ω.

[0197]

Table 2

[0198] In some embodiments, as shown in FIG. 51 or FIG. 53, the coil 49124 is externally fitted outside the magnet assembly 491231 around an axis parallel to the vibration direction, the magnetic flux conduction cover 491232 is externally fitted outside the coil 49124 around the axis, and there is a magnetic gap A1 between the coil 49124 and the magnet assembly 491231. The magnetic gap A1 is a gap formed between the inner wall of the coil 49124 and the outer wall of the magnet 491233 in the magnet assembly 491231. If the magnetic gap A1 is too large, the magnetic field strength will decrease, and if the magnetic gap A1 is too small, it will be difficult to realize the processing process. Therefore, in some embodiments, in order to balance the magnetic field strength and the realization of the processing process, the width along the radial direction of the magnetic gap A1 may be within the range of 0.25 mm to 0.35 mm. For example, the magnetic gap A1 may be within the range of 0.27 mm to 0.33 mm. Also for example, the magnetic gap A1 may be within the range of 0.29 mm to 0.31 mm. Further for example, the magnetic gap A1 between the coil 49124 and the magnet assembly 491231 may be 0.3 mm. In some embodiments, on the premise of meeting the requirement of the width of the magnetic gap A1, after selecting a magnet 491233 of appropriate size, the radial elasticity of the vibration transmission sheet (for example, the first vibration transmission sheet 49125 and the second vibration transmission sheet 49126) may be designed to obtain the conditions necessary to resist the attractive force of the magnet 491233.

[0199] In some embodiments, in order to avoid the magnetic saturation of the magnetic flux conduction cover 491232 being disadvantageous to the improvement of the magnetic field strength, the thickness of the magnetic flux conduction cover 491232 along the radial direction of the transducer device 4912 should not be too thin. In some embodiments, the thickness of the magnetic flux conduction cover 491232 along the radial direction of the transducer device 4912 may be 0.3 mm or more. Also, if the magnetic flux conduction cover 491232 is too thick, the thickness of the transducer device 4912 will increase, so the thickness of the magnetic flux conduction cover 491232 should not be too thick either. Therefore, when both weight reduction and avoidance of magnetic saturation are achieved, the thickness of the magnetic flux conduction cover 491232 along the radial direction of the transducer device 4912 may be in the range of 0.3 mm to 1 mm. For example, the thickness of the magnetic flux conduction cover 491232 may be in the range of 0.4 mm to 0.9 mm. Also for example, the thickness of the magnetic flux conduction cover 491232 may be in the range of 0.5 mm to 0.8 mm. In some embodiments, as shown in FIG. 54A, in order to further reduce the mass of the transducer device 4912 (and further reduce the mass of the acoustic output unit 4910), the magnetic flux conduction cover 491232 may have a cutout structure 491232a. The cutout structure 491232a may include cutout grooves, cutout holes, etc. formed in the magnetic flux conduction cover 491232. The cutout groove or cutout hole may be a removal structure with any shape or any configuration. For example, the cutout groove may be a through groove or a concave groove with any cross-section on the magnetic flux conduction cover 491232. Also for example, the cutout groove may be an annular groove formed on the inner wall of the magnetic flux conduction cover 491232. In some embodiments, the cutout groove may be a rectangular through groove that penetrates the side wall of the magnetic flux conduction cover 491232 and extends to one end face along the vibration direction of the magnetic flux conduction cover 491232. FIG. 54C is a partial schematic view of a cylindrical magnetic flux conduction cover 491232 according to some embodiments of the present application, and FIG. 54D is a schematic view of a bowl-shaped magnetic flux conduction cover 491232 according to some embodiments of the present application. As shown in FIG. 54C, the cutout structure 491232a may include cutout holes formed in the side wall of the cylindrical magnetic flux conduction cover 491232.As shown in FIG. 54D, the hollowed-out structure 491232a may include a hollowed-out hole formed in the side wall and / or bottom of the bowl-shaped magnetic flux conduction cover 491232.

[0200] FIG. 55 is a comparison diagram of frequency response curves when a groove is formed in the magnetic flux conduction cover 491232 and when no groove is formed. As shown in FIG. 55, the horizontal axis represents the frequency (Hz), the vertical axis represents the frequency response (dB), the curve 81 is the frequency response curve of the transducer device 4912 when no groove is formed, and the curve 82 is the frequency respons...

Claims

1. A transducer device configured to generate mechanical vibrations based on an electrical signal, including a magnetic circuit assembly and a vibration transmission sheet, A case configured to accommodate the transducer device, including a panel and a housing, wherein the magnetic circuit assembly is elastically connected to the case by the vibration transmission sheet, and the transducer device transmits the mechanical vibrations to a user by the panel, An acoustic output device including an additional element connected to the magnetic circuit assembly and holding an elastic connection with the panel by the magnetic circuit assembly.

2. The acoustic output device according to claim 1, wherein the additional element and the magnetic circuit assembly vibrate with respect to the panel to generate a resonance peak within a target frequency range, and the target frequency range is 20 Hz to 800 Hz.

3. The acoustic output device according to claim 2, wherein the additional element and the magnetic circuit assembly vibrate with respect to the panel to further generate a resonance dip within the target frequency range, and a frequency corresponding to the resonance dip is smaller than a frequency corresponding to the resonance peak.

4. The acoustic output device according to any one of claims 1 to 3, wherein the panel is located at one end of the housing and forms an accommodation cavity for accommodating the transducer device together with the housing, the magnetic circuit assembly is elastically connected to the panel by the vibration transmission sheet, the panel and the housing are connected by an elastic element, the magnetic circuit assembly is rigidly connected to at least a part of a side wall adjacent to the panel of the housing, the vibration transmission sheet is located between the panel and the magnetic circuit assembly, and is elastically connected to the magnetic circuit assembly and the panel.

5. The housing includes a housing body and a back plate. The housing body is a side wall adjacent to the panel of the housing, and the back plate is a side wall facing the panel of the housing. The panel and the back plate are respectively located at both ends of the housing body and are rigidly connected to the housing body. The acoustic output device further includes a support member. The support member is provided around the circumferential side of the housing body or installed on one side of the housing body. The magnetic circuit assembly is rigidly connected to the support member, and the additional element is rigidly connected to the support member. The acoustic output device according to any one of claims 1 to 3.

6. The vibration transmission sheet is located between the magnetic circuit assembly and the panel and is elastically connected to the magnetic circuit assembly and the panel. The acoustic output device according to claim 5.

7. The vibration transmission sheet is located between the magnetic circuit assembly and the back plate and is elastically connected to the magnetic circuit assembly and the back plate. The acoustic output device according to claim 5.

8. Between both ends of the support member and the panel and the back plate, a filling material or an elastic element is installed. The acoustic output device according to claim 6 or 7.

9. The number of the vibration transmission sheets is plural. The plural vibration transmission sheets include a first vibration transmission sheet and a second vibration transmission sheet. The first vibration transmission sheet is located between the magnetic circuit assembly and the panel and is elastically connected to the magnetic circuit assembly and the panel. The second vibration transmission sheet is located between the magnetic circuit assembly and the back plate and is elastically connected to the magnetic circuit assembly and the back plate. The acoustic output device according to claim 5.

10. The support member has a cylindrical structure, the cylindrical structure is provided around the circumferential side of the housing body, a notch is provided in the corresponding side wall of the housing body, the circumferential side of the magnetic circuit assembly is rigidly connected to the cylindrical structure by the notch, and the additional element is rigidly connected to the cylindrical structure. The acoustic output device according to claim 5.

11. The support member has a plate-like structure, the plate-like structure is installed on one side of the housing body, a notch is installed in the corresponding side wall of the housing body, a part of the structure of the magnetic circuit assembly is rigidly connected to the plate-like structure by the notch, and the additional element is rigidly connected to the plate-like structure. The acoustic output device according to claim 6.

12. The vibration transmission sheet includes a central region, an edge region, and a plurality of support rods connecting the edge region and the central region. The central region of the vibration transmission sheet is connected to the side away from the panel of the magnetic circuit assembly, and the edge region of the vibration transmission sheet is connected to the housing. The acoustic output device according to any one of claims 1 to 11.

13. In the natural state of the vibration transmission sheet, the edge region of the vibration transmission sheet and the central region of the vibration transmission sheet are not flush, and when the vibration transmission sheet is connected to the magnetic circuit assembly and the housing, a tightening force is applied. The acoustic output device according to claim 12.

14. The plurality of support rods includes four support rods, and the four support rods are installed at intervals along the circumferential side of the central region of the vibration transmission sheet. The acoustic output device according to claim 12.

15. For one of the plurality of support rods, along the longitudinal direction of the vibration transmission sheet, the ratio of the distance between the starting point and the ending point of the support rod to the length of the support rod is within the range of 0 to 1.

2. The acoustic output device according to claim 12.

16. One of the plurality of support rods satisfies one or more of the following conditions: the length of the support rod is in the range of 7 mm to 25 mm, the thickness of the support rod is in the range of 0.1 mm to 0.2 mm, the width of the support rod is in the range of 0.25 mm to 0.5 mm, or the ratio of the thickness of the vibration transmission sheet where the support rod is located to the width of the support rod is in the range of 0.16 to 0.

75. The acoustic output device according to claim 12.

17. Each of the support rods includes one or more meandering structures. The acoustic output device according to claim 12.

18. The housing includes one or more decompression holes for communicating the air inside the case with the outside air. The acoustic output device according to any one of claims 1 to 17.

19. It includes a support structure configured to mount the acoustic output device in the region of the user's ear or head without blocking the user's ear canal, and the support structure is rigidly connected to the panel or the housing. The acoustic output device according to any one of claims 1 to 18.

20. The additional element includes an air-conduction speaker, and the included angle between the vibration direction of the diaphragm of the air-conduction speaker and the vibration direction of the transducer device is 75° to 100°. The acoustic output device according to any one of claims 1 to 19.

Images