Acoustic output device

Abstract

Acoustic output device comprising: a housing; a bone conduction vibrator configured to generate bone conduction sound waves such that the bone conduction sound waves are transmitted through the housing to the cochlea to produce sound; an air conduction vibrator configured to generate air conduction sound waves such that the air conduction sound waves are transmitted to the ear through a sound conduction opening provided in the housing;and a processing module configured to provide a first audio signal to the bone conduction vibration element and a second audio signal to the air conduction vibration element, wherein the first audio signal and the second audio signal have a frequency cutoff point, and the first audio signal and the second audio signal each comprise a corresponding component with frequencies above the frequency cutoff point and a corresponding component with frequencies below the frequency cutoff point, and wherein the frequency cutoff point is not lower than 1500 Hz.

Description

An acoustic output device

[0001] Cross-references

[0002] This application claims priority to Chinese application No. 202310541798.X filed on May 12, 2023, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This specification relates to the field of acoustics, and in particular to an acoustic output device. Background Art

[0004] The power consumption, volume, and sound leakage of acoustic output devices influence and restrict each other. When outputting at a high volume, the power consumption of acoustic output devices is relatively high, and the sound leakage performance is also not ideal.

[0005] Therefore, it is necessary to propose an acoustic output device that can effectively reduce the power consumption of the entire device while achieving sufficient volume output and low sound leakage performance.

[0006] Summary of the Invention

[0007] One of the embodiments of this specification provides an acoustic output device, comprising: a shell; a bone conduction vibrator, used to generate bone-conducted sound waves and transmit them to the cochlea through the shell to produce sound; an air conduction vibrator, used to generate air-conducted sound waves, which are transmitted to the ear through the sound guide holes on the shell; a processing module, used to provide a first audio signal and a second audio signal to the bone conduction vibrator and the air conduction vibrator, respectively, the first audio signal and the second audio signal having a crossover point, the first audio signal and the second audio signal respectively including components with frequencies above and below the crossover point, wherein the crossover point is not lower than 600 Hz.

[0008] In some embodiments, the crossover frequency point is not lower than 1500 Hz.

[0009] In some embodiments, the shell includes two sound guide holes, and the sound radiated to the far field through the two sound guide holes is directive. The directivity is manifested as a difference of not less than 3dB between the sound pressure level in the direction of the line connecting the two sound guide holes and the sound pressure level in at least one other direction.

[0010] In some embodiments, the difference in sound amplitude emitted by the two sound guide holes is less than 6 dB, and the phase difference is 150°-210°.

[0011] In some embodiments, the difference in acoustic loads between the two sound guide holes is less than 0.15.

[0012] In some embodiments, the ratio of the surface acoustic loads of the two sound guide holes is 0.5-3.5.

[0013] In some embodiments, the crossover frequency point is no higher than 4000 Hz.

[0014] In some embodiments, the processing module obtains the first audio signal and the second audio signal by performing high-pass filtering and low-pass filtering on the electrical signal containing the sound information.

[0015] In some embodiments, the bone conduction vibrator includes a first magnetic circuit, a vibrating plate and a first coil, and the air conduction vibrator includes a diaphragm, a second magnetic circuit and a second coil, wherein the angle between the first vibration direction of the vibrating plate in the first magnetic circuit and the second vibration direction of the diaphragm in the second magnetic circuit is in the range of 80°-100°.

[0016] In some embodiments, the center of mass of the bone conduction vibrator and the center of mass of the air conduction vibrator are spaced apart in the first vibration direction.

[0017] In some embodiments, the center of mass of the bone conduction vibrator is aligned with the center of mass of the air conduction vibrator in the second vibration direction, and the bone conduction vibrator and the air conduction vibrator rotate relative to each other.

[0018] In some embodiments, the bone conduction vibrator includes two symmetrically arranged vibration plates located on both sides of the first magnetic circuit, and the symmetry axes of the two vibration plates are spaced apart from the central axis of the air conduction vibrator in the first vibration direction.

[0019] In some embodiments, the second magnetic circuit of the air conduction vibrator is located on the side of the diaphragm away from the bone conduction vibrator.

[0020] In some embodiments, the shell includes a first sound guide hole and a second sound guide hole, wherein the first sound guide hole is located on the side wall of the shell opposite to the bottom wall of the second magnetic circuit facing away from the diaphragm, and the second sound guide hole is connected to the front cavity where the diaphragm is located away from the second magnetic circuit.

[0021] In some embodiments, the acoustic output device further includes: an ear hook assembly, the ear hook assembly is connected to the shell, wherein the second sound guide hole is arranged on a side wall of the shell away from the ear hook assembly along the extension direction of the ear hook assembly.

[0022] In some embodiments, the second sound guide hole includes two or more second sub-sound guide holes, and the acoustic output device also includes an ear hook component, which is connected to the shell, wherein at least one of the two or more second sub-sound guide holes is arranged on the outer wall of the shell.

[0023] In some embodiments, the vibration plate includes a long axis direction perpendicular to the first vibration direction, and in the long axis direction, the distance between the lowest point of the bone conduction vibrator and the lowest point of the outer opening of the second sound guide hole is not less than 1.0 mm.

[0024] In some embodiments, a curvature radius of a corner formed between a first side wall of the bone conduction vibrator close to the second sound guide hole and a second side wall close to the diaphragm is greater than 1.0 mm.

[0025] In some embodiments, the distance from the center point of the corner formed by the first side wall of the bone conduction vibrator close to the second sound guide hole and the second side wall close to the diaphragm to the apex of the fold of the diaphragm is not less than 1.5 mm.

[0026] In some embodiments, the front cavity includes an air flow channel connected to the second sound guide hole, and the minimum cross-sectional area of ​​the air flow channel is not less than 5.3mm 2 .

[0027] In some embodiments, the acoustic output device further includes: a microphone, wherein a microphone hole corresponding to the microphone is provided on the shell, and the microphone hole and the second sound guide hole are covered by the same steel mesh.

[0028] In some embodiments, in the wearing state, the microphone hole is closer to the ear hook assembly than the second sound guide hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] This specification will be further described in the form of exemplary embodiments, which will be described in detail with reference to the accompanying drawings. These embodiments are not limiting, and in these embodiments, like numbers represent like structures, wherein:

[0030] FIG1 is a schematic diagram of an acoustic output device according to some embodiments of the present specification;

[0031] FIG2 is a schematic structural diagram of the connection portion between a core assembly and an ear hook assembly according to some embodiments of this specification;

[0032] FIG3 is a schematic exploded view of the structure of the movement assembly in FIG2 ;

[0033] FIG4 is a schematic cross-sectional view of a movement assembly taken along the line AA according to some embodiments of the present specification;

[0034] FIG5A is a schematic cross-sectional view of a movement assembly taken along the AA cross-sectional direction according to other embodiments of the present specification;

[0035] FIG5B is a schematic structural diagram of a movement assembly according to other embodiments of the present specification;

[0036] FIG6 is a schematic cross-sectional view of a movement assembly according to some embodiments of the present disclosure, taken along line BB;

[0037] FIG7 is a schematic cross-sectional view of a second sound guide hole according to some embodiments of this specification;

[0038] FIG8 is a schematic diagram of the arrangement position of the second sound guide hole according to some embodiments of this specification;

[0039] FIG9 is a schematic diagram of a surface of a portion of a housing according to some embodiments of the present specification;

[0040] FIG10 is a schematic diagram of a surface of a portion of a housing according to some embodiments of the present specification;

[0041] FIG. 11 is a diagram showing the effect of a crossover point on power consumption of an acoustic output device according to some embodiments of this specification. DETAILED DESCRIPTION

[0042] To more clearly illustrate the technical solutions of the embodiments of this application, the following is a brief introduction to the drawings required for describing the embodiments. Obviously, the drawings described below are merely examples or embodiments of this application. Those skilled in the art can apply this application to other similar scenarios based on these drawings without inventive effort. Unless otherwise apparent from the context or otherwise noted, the same reference numerals in the figures represent the same structure or operation.

[0043] It should be understood that the terms "system," "device," "unit," and / or "module" used herein are a method for distinguishing different components, elements, parts, portions, or assemblies at different levels. However, if other terms can achieve the same purpose, the terms may be replaced by other expressions.

[0044] As used in this application and the claims, unless the context clearly indicates otherwise, the words "a," "an," "an," and / or "the" are not intended to refer to the singular but may include the plural. Generally speaking, the terms "comprises" and "include" only indicate the inclusion of the steps and elements specifically identified, and these steps and elements do not constitute an exclusive list. A method or apparatus may also include other steps or elements.

[0045] FIG. 1 is a schematic diagram of an acoustic output device according to some embodiments of the present specification.

[0046] Some embodiments of this specification provide an acoustic output device 100. As shown in Figure 1, the acoustic output device 100 includes a core assembly 1, an ear hook assembly 2, and a back hook assembly 3. In some embodiments, there are two core assemblies 1. The two core assemblies 1 are used to transmit vibration and / or sound to the user's left ear and right ear respectively, and the two core assemblies 1 can be the same or different. For example, one core assembly 1 can be provided with a microphone, while the other core assembly 1 can not be provided with a microphone. For another example, one core assembly 1 can be provided with a button and a corresponding circuit board, while the other core assembly 1 can not be provided with the button and the corresponding circuit board. The two core assemblies 1 can be the same in the core module (such as a speaker module). This article will later describe in detail one of the two core assemblies 1 as an example. There can be two ear hook assemblies 2, and the two ear hook assemblies 2 can be hung on the user's left ear and right ear respectively, so that the core assembly 1 can fit the user's face. For example, one ear hook assembly 2 can be provided with a battery, and the other ear hook assembly 2 can be provided with a control circuit, etc. One end of the earhook assembly 2 is connected to the core assembly 1, and the other end of the earhook assembly 2 is connected to the backhook assembly 3. The backhook assembly 3 connects the two earhook assemblies 2 and is used to wrap around the back of the user's neck or head. It can provide a clamping force, so that the two core assemblies 1 are clamped to both sides of the user's face and the earhook assemblies 2 are more firmly hung on the user's ears.

[0047] It should be noted that in some embodiments, the acoustic output device 100 may not include a rear-hanging component 3. In this case, the acoustic output device 100 may include a core component 1 and an earhook component 2. One end of the earhook component 2 may be connected to the core component 1, and its other end may extend along the junction of the user's ear and head. In some embodiments, the earhook component 2 may have an arc-shaped structure that adapts to the user's auricle, so that the earhook component 2 is suspended from the user's auricle. For example, the earhook component 2 may have an arc-shaped structure that adapts to the junction of the user's head and ear, so that the earhook component 2 can be hung between the user's auricle and head. In some embodiments, the earhook component 2 may also have a clamping structure that adapts to the user's auricle, so that the earhook component 2 can be clamped to the user's auricle. For example, the earhook component 2 may include a hook-shaped portion and a connecting portion connected in sequence. The connecting portion connects the hook-shaped portion to the core component 1, so that the acoustic output device 100 is curved in three-dimensional space when it is not worn (i.e., in its natural state). In other words, in three-dimensional space, the hook portion, the connecting portion, and the core assembly 1 are not coplanar. With this arrangement, when the acoustic output device 100 is in a worn state, the hook portion can be primarily used to hang between the back of the user's ear and the head, and the core assembly 1 can be primarily used to contact the front of the user's ear or the user's head, thereby allowing the core assembly 1 and the hook portion to cooperate to be clamped on the ear. For example, the connecting portion can extend from the head toward the outside of the head, thereby cooperating with the hook portion to provide a pressing force on the front of the ear for the core assembly 1. Under the action of the pressing force, the core assembly 1 can be pressed against the user's skin, so that the acoustic output device 100 does not block the external auditory canal of the ear when it is worn.

[0048] In some other embodiments, the acoustic output device 100 may not include the ear-hook component 2 and the rear-hook component 3, but may include other fixed structures (not shown). The core component 1 is fixed on the fixed structure so that the core component 1 is fitted to the ear, head or other parts of the user through the fixed structure, and the air-conducted sound waves and / or bone-conducted sound waves output by the core component 1 are transmitted to the user. For example, the fixed structure may be a head-mounted structure, which connects the left and right core components 1 to form a head-mounted acoustic output device. For another example, the fixed structure is a bracket for glasses, and the core component is fixed to the bracket for glasses. For another example, the fixed structure may also be a helmet, a mask or other structure, which is not specifically limited here.

[0049] The following will describe the structure of the core assembly 1 and other parts of the acoustic output device 100 with reference to the accompanying drawings.

[0050] Figure 2 is a schematic diagram of the connection between the core assembly and the ear hook assembly according to some embodiments of this specification. Figure 3 is an exploded schematic diagram of the core assembly structure in Figure 2. As shown in Figures 2 and 3, the core assembly 1 includes a housing 10, a bone conduction vibrator 11, and an air conduction vibrator 12.

[0051] In some embodiments, the housing 10 is provided with a mutually isolated accommodating chamber 1001 and an accommodating chamber 1002, with the accommodating chamber 1001 having a greater sealing performance than the accommodating chamber 1002. A bone conduction vibrator 11 is disposed within the accommodating chamber 1001, and an air conduction vibrator 12 is disposed within the accommodating chamber 1002. The acoustic output device 100 operates in conjunction with the bone conduction vibrator 11 and the air conduction vibrator 12. The air conduction vibrator 12 is configured to generate air-conducted sound waves and transmit them through a sound conduction hole (e.g., the first sound conduction hole 1080) in the housing 10 to the user's ear (or ear canal), allowing the user to receive air-conducted sound. The bone conduction vibrator 11 is configured to generate bone-conducted sound waves and transmit them through the housing 10 to the user's cochlea to produce bone-conducted sound. In some embodiments, the accommodating chamber 1001 is configured as a completely sealed accommodating chamber, and the accommodating chamber 1002 is configured as a highly sealed accommodating chamber while ensuring that the air conduction vibrator 12 can produce sound. By independently disposing the bone conduction vibrator 11 and the air conduction vibrator 12 in the above manner, the sealing effect of the bone conduction vibrator 11 can be effectively improved, thereby preventing the bone conduction vibrator 11 from being corroded and damaged by external environmental factors, while also ensuring the sound quality of the air conduction vibrator 12. Furthermore, when the bone conduction vibrator 11 and the air conduction vibrator 12 of the acoustic output device 100 are operating simultaneously, the bone conduction vibrator 11 and the air conduction vibrator 12 are disposed in the accommodation chamber 1001 and the accommodation chamber 1002, respectively, effectively preventing mutual interference between the bone conduction vibrator 11 and the air conduction vibrator 12 (for example, mutual interference between the vibrations generated by the bone conduction vibrator 11 and the air conduction vibrator 12), thereby effectively improving the sound quality of the acoustic output device 100.

[0052] In some embodiments, referring again to Figures 2 and 3 , the housing 10 includes a first housing 101, a second housing 102, and a third housing 103. The first housing 101 and the second housing 102 cooperate with each other to form a receiving cavity 1001. The first housing 101 and / or the second housing 102 further form a portion of the receiving cavity 1002, and the third housing 103 cooperates with the first housing 101 and / or the second housing 102 to form another portion of the receiving cavity 1002. In some embodiments, the housing 10 can be composed of a first housing 101, a second housing 102, and a third housing 103 that cooperate with each other, wherein the first housing 101 and the second housing 102 cooperate to form a receiving chamber 1001, the first housing 101 can be provided with a portion of the receiving chamber 1002, and the third housing 103 cooperates with the first housing 101 to form another portion of the receiving chamber 1002. The housing 10 is composed of the first housing 101, the second housing 102, and the third housing 103 of the above-mentioned structure that cooperates with each other, which can make the movement assembly 1 compact and facilitate the assembly of the movement assembly 1, thereby improving the assembly efficiency of the movement assembly 1. In some embodiments, a portion of the receiving chamber 1002 can also be provided in the second housing 102, and the third housing 103 cooperates with the second housing 102 to form another portion of the receiving chamber 1002, or the first housing 101 and the second housing 102 cooperate to form a portion of the receiving chamber 1002, and the third housing 103 cooperates with the first housing 101 and the second housing 102 to form another portion of the receiving chamber 1002. The housing 10 implemented by any of the above embodiments can make the structure of the movement assembly 1 compact while also facilitating the assembly of the movement assembly 1 , thereby improving the assembly efficiency of the movement assembly 1 .

[0053] In some embodiments, a partition wall 1012 is provided within the housing 10 for separating the accommodating chamber 1001 from the accommodating chamber 1002. In some embodiments, the partition wall 1012 can be provided on the first housing 101 and / or the second housing 102. The first housing 101 and the second housing 102 cooperate with each other to form the accommodating chamber 1001. The first housing 101 and / or the second housing 102 further form a portion of the accommodating chamber 1002. The third housing 103 cooperates with the first housing 101 and / or the second housing 102 to form another portion of the accommodating chamber 1002. The provision of the partition wall 1012 on the first housing 101 and / or the second housing 102 can be understood as the partition wall 1012 being part of the first housing 101 and / or the second housing 102. The first housing 101 and / or the second housing 102 further form a portion of the accommodating chamber 1002. The third housing 103 cooperates with the first housing 101 and / or the second housing 102 to form another portion of the accommodating chamber 1002. Of course, the partition wall 1012 is not limited to being disposed on the first shell 101 and / or the second shell 102 . In other embodiments, the partition wall 1012 may also be a component independent of the first shell 101 and / or the second shell 102 . In some embodiments, a partition wall 1012 is provided on the first shell 101, and the first shell 101 is provided with a sub-accommodating chamber 1010 and a sub-accommodating chamber 1011 located on opposite sides of the partition wall 1012. The opening direction of the sub-accommodating chamber 1010 is arranged along the wall surface of the partition wall 1012, and the opening direction of the sub-accommodating chamber 1011 is arranged cross-wise with the wall surface of the partition wall 1012. The second shell 102 is provided with a sub-accommodating chamber 1020, and the second shell 102 is covered on the open end of the sub-accommodating chamber 1010. The sub-accommodating chamber 1020 cooperates with the sub-accommodating chamber 1010 to form the accommodating chamber 1001; the third shell 103 is provided with a sub-accommodating chamber 1030, and the third shell 103 is covered on the open end of the sub-accommodating chamber 1011. The sub-accommodating chamber 1030 cooperates with the sub-accommodating chamber 1011 to form the accommodating chamber 1002.

[0054] The acoustic output of the acoustic output device 100 includes air-conducted sound waves and bone-conducted sound waves. The acoustic output device 100 outputs air-conducted sound waves near the user's ears, so that the user hears the sound while also radiating the sound to the surrounding environment. This causes a large degree of sound leakage from the acoustic output device 100. In the application scenario of the acoustic output device 100, the output volume of the acoustic output device 100 is increased so that the user can hear a louder sound, but the volume of the sound radiated to the surrounding environment will also increase, resulting in increased sound leakage from the acoustic output device 100. At the same time, in order to increase the output volume of the acoustic output device 100, the vibration amplitude of the bone conduction vibrator 11 and the air conduction vibrator 12 must also be increased accordingly, resulting in increased power consumption of the acoustic output device 100. The bone conduction vibrator 11 pushes a physical load (such as the second shell 102, the user's tissue, bones, etc.) to produce bone-conducted sound, and the air conduction vibrator 12 pushes an air load to produce air-conducted sound. In the lower frequency range, the sound generated by the bone conduction vibrator 11 pushes a greater load than the air conduction vibrator 12. Therefore, for the same output volume, the air conduction vibrator 12 consumes less power than the bone conduction vibrator 11. Therefore, to increase the output volume of the acoustic output device 100 while reducing its power consumption, the air conduction vibrator 12 can be configured to output more low-frequency sound, while the sound output by the bone conduction vibrator 11 can be configured to cover a smaller frequency range or move away from the low-frequency range. For example, air conduction sound waves can be used instead of bone conduction sound waves in the lower frequency range (e.g., 20Hz-1000Hz) to reduce the power consumption of the acoustic output device 100. However, if the acoustic output device 100 also outputs air-conducted sound waves within a higher frequency range (e.g., 1000 Hz-5000 Hz), the far-field sound leakage of the acoustic output device 100 will increase (for example, as described later, at higher frequencies, the far-field directivity of the air-conducted sound waves output by the acoustic output device 100 deteriorates, reducing sound leakage), thereby affecting the overall sound quality of the sound emitted by the acoustic output device 100. Therefore, within the higher frequency range, bone-conducted sound waves can be used instead of air-conducted sound waves to improve the overall sound quality of the sound emitted by the acoustic output device 100. This configuration significantly improves the power consumption of the acoustic output device 100, maintaining a good level even at high output volumes (see FIG. 11 and its description for details). Furthermore, by adjusting the frequency range of the air-conducted sound waves, the sound quality of the acoustic output device 100 can be adjusted to meet user needs.

[0055] In some embodiments, to adjust the frequency range of bone-conducted and air-conducted sound waves, the acoustic output device 100 further includes a processing module (not shown) configured to provide a first audio signal and a second audio signal to the bone conduction transducer 11 and the air conduction transducer 12, respectively. Specifically, the acoustic output device 100 converts the original audio signal (i.e., an electrical signal containing sound information) into sound waves that can be received by the user. The processing module processes the original audio signal to produce the first and second audio signals. The bone conduction transducer 11 vibrates in response to the first audio signal to generate bone-conducted sound waves, and the air conduction transducer 12 vibrates in response to the second audio signal to generate air-conducted sound waves. The signal processing mentioned herein may include, but is not limited to, at least one of signal amplification, phase adjustment, and filtering. In some embodiments, the processing module may process the original audio signal using hardware, software (algorithms), or a combination thereof. For example, the processing module may amplify a signal using an amplifier circuit and / or an algorithm. In some embodiments, the hardware may include, but is not limited to, an equalizer (EQ), a dynamic range controller (DRC), a phase processor (GAIN), and the like. In some embodiments, the processing module may be disposed inside at least one of the two core components 1 and the two ear hook components 2 .

[0056] In some embodiments, the first audio signal and the second audio signal have a crossover point. In the present application, the crossover point refers to the intersection of the first audio signal and the second audio signal in the frequency domain after being processed by the processing module and output to the bone conduction vibrator 11 and the air conduction vibrator 12, respectively. The first audio signal includes a first frequency band (for example, 500Hz-5kHz), and the first frequency band includes frequency components with frequencies above the crossover point; the second audio signal includes a second frequency band (for example, 20Hz-500Hz), and the second frequency band includes frequency components with frequencies below the crossover point.

[0057] It should be noted that in this application, the crossover point can be measured in the following way: connect a lead in parallel with the input end of the bone conduction vibrator 11 and the air conduction vibrator 12 from the output end of the processing module, and use a sound card and Audition software to record the two sets of electrical signals and convert them into the frequency domain. The intersection of the curves corresponding to the two sets of electrical signals in the frequency domain is the crossover point of the two sets of electrical signals.

[0058] In some embodiments, based on the crossover point, the processing module can determine the components of the original audio signal with frequencies within a first frequency band, i.e., the first audio signal, and the components with frequencies within a second frequency band, i.e., the second audio signal. The bone conduction vibrator 11 vibrates in response to the first audio signal to generate bone-conducted sound waves within the first frequency band, and the air conduction vibrator 12 vibrates in response to the second audio signal to generate air-conducted sound waves within the second frequency band.

[0059] In this application, by outputting sounds in a lower frequency band (e.g., the second frequency band) as air-conducted sound waves, the power consumption of the acoustic output device 100 is reduced. Furthermore, sound leakage in the lower frequency band (e.g., the second frequency band) is less likely to be received by the human ear, thus minimizing the impact on the user's listening experience and privacy. Furthermore, by outputting sounds in a higher frequency band (e.g., the first frequency band) as bone-conducted sound waves, the sound is transmitted through the user's tissue / bone, thereby improving the sound quality of the sound output by the acoustic output device 100.

[0060] In some embodiments, the processing module may perform high-pass filtering on the original audio signal to obtain the first audio signal, and perform low-pass filtering on the original audio signal to obtain the second audio signal. In some embodiments, the processing module includes a high-pass filter and a low-pass filter. The processing module performs high-pass filtering and low-pass filtering on the original audio signal using the high-pass filter and the low-pass filter.

[0061] In some embodiments, the cutoff frequency of the low-pass filter can be the same as the cutoff frequency of the high-pass filter. After the original audio signal is processed by low-pass filtering, the portion above the cutoff frequency, i.e., the crossover point, is filtered out, thereby primarily retaining low-frequency components below the cutoff frequency (i.e., the second audio signal). Similarly, after the original audio signal is processed by high-pass filtering, the portion below the cutoff frequency, i.e., the crossover point, is filtered out, thereby primarily retaining high-frequency components above the cutoff frequency (i.e., the first audio signal). In some embodiments, the cutoff frequency of the low-pass filter can be different from the cutoff frequency of the high-pass filter. In this case, the crossover point is the intersection of the first audio signal output to the bone conduction vibrator and the second audio signal in the frequency domain.

[0062] In some embodiments, the original audio signal may be a specific audio signal. The specific audio signal may include an audio signal stored internally in the acoustic output device 100 or in a device connected to external communication. For example, the audio signal stored internally in the acoustic output device 100 may include a white noise signal, a pure tone signal, a pulse signal, narrowband noise, a narrowband warbling tone, a modulated tone, and / or a swept tone signal.

[0063] In some embodiments, to allow the acoustic output of the acoustic output device 100 to be output more in the form of air-conducted sound waves, thereby further reducing its power consumption and ensuring low sound leakage within the frequency range to which the human ear is most sensitive, the crossover frequency point may be no less than 600 Hz. For example, the crossover frequency point may be 600 Hz, 800 Hz, 1 kHz, 1.2 kHz, 1.5 kHz, 2 kHz, 2.5 kHz, 3 kHz, 3.5 kHz, 4 kHz, etc.

[0064] In some embodiments of the present specification, by setting a higher frequency crossover point, the acoustic output of the acoustic output device 100 is output more in the form of air-conducted sound waves. Since the air load pushed by the air-conducted vibrator 12 is small, the power consumption can be effectively reduced, ensuring that the acoustic output device 100 has a longer battery life even at a higher volume.

[0065] In some embodiments, to further reduce the power consumption of the acoustic output device 100, a higher frequency crossover point can be set so that the acoustic output of the acoustic output device 100 is output more in the form of air-conducted sound waves. In some embodiments, the crossover point is not less than 1 kHz. In some embodiments, the crossover point is not less than 1.5 kHz.

[0066] In some embodiments of this specification, by setting a higher frequency crossover point, the acoustic output of the acoustic output device 100 is output more in the form of air-conducted sound waves, which can further reduce its power consumption (see Figure 11 and its description for details).

[0067] In some embodiments, in order to further reduce the power consumption of the acoustic output device 100, a higher frequency crossover point can be set, for example, the crossover point is not lower than 2kHz. However, at this time, the human ear is relatively sensitive to sounds with frequencies lower than the crossover point, and the higher the crossover point frequency, the worse the directionality of the air-conducted sound in the far field, resulting in increased sound leakage from the acoustic output device 100, which may affect the user's listening and listening privacy.

[0068] Therefore, in some embodiments, to reduce sound leakage from the acoustic output device 100, the housing 10 (e.g., the first housing 101, the second housing 102, and / or the third housing 103) of the acoustic output device 100 may include two sound guide holes, for example, the first sound guide hole 1080 and the second sound guide hole 1081 as shown in FIG6. The first sound guide hole 1080 is used to conduct the air-conducted sound waves generated by the air-conducting vibrator 12, and the second sound guide hole 1081 is used to relieve pressure on the air-conducting vibrator 12 to ensure the normal and stable operation of the air-conducting vibrator 12. The air-conducting vibrator 12 can radiate sound with a phase difference to the outside world through the two sound guide holes. In some embodiments, the air-conducting vibrator 12 can radiate sound with equal amplitude (or substantially equal) and opposite phase (or substantially opposite) to the outside world through the two sound guide holes. The first sound guide hole 1080 and the second sound guide hole 1081 can form a dipole or dipole-like output structure, which can form a directional radiation sound field similar to an "8" shape. The sound radiated by the sound guide hole is the loudest in the straight line connecting the first sound guide hole 1080 and the second sound guide hole 1081, and the sound radiated in other directions is significantly smaller. Therefore, by providing at least two sound guide holes in the acoustic output device to form a dipole or dipole-like structure, the sound radiated by the acoustic output device to the surrounding environment (i.e., far-field sound leakage) can be reduced.

[0069] In some embodiments, to enable the first sound guide hole 1080 and the second sound guide hole 1081 to form a dipole or a quasi-dipole to improve the acoustic output device's ability to reduce sound leakage, the amplitude difference of the sound radiated from the two sound guide holes can be less than 6 dB (for example, an amplitude difference of 1 dB, 3 dB, 5 dB, etc.), and the phase difference of the sound radiated through the two sound guide holes can be within the range of 150°-210°. In some embodiments, to ensure that the quasi-dipole formed by the first sound guide hole 1080 and the second sound guide hole 1081 is more standardized, the amplitude difference of the sound emitted by the two sound guide holes is less than 5 dB, and the phase difference of the sound emitted by the two sound guide holes is 160°-200°. In some embodiments, the amplitude difference of the sound emitted by the two sound guide holes is less than 3 dB, and the phase difference of the sound emitted by the two sound guide holes is 170°-190°. In some embodiments, the amplitude difference of the sound emitted by the two sound guide holes is less than 3 dB, and the phase difference of the sound emitted by the two sound guide holes is 175°-185°. In some embodiments, to ensure that the difference in the amplitude of the sound radiated from the two sound guide holes is less than 6dB, the difference in the near-field sound pressure levels of the two sound guide holes can be less than 6dB. As can be understood, the smaller the difference in the near-field sound pressure levels, the more significant the cancellation of sound waves with the same amplitude and opposite phase in the far field, and the better the effect of reducing sound leakage.

[0070] In this specification, the near-field sound pressure level difference refers to the difference in sound pressure levels of the sound radiated by two sound guide holes to a near-field location. In this application, the near-field location of a sound guide hole can refer to a location within 5 mm of the sound guide hole. For ease of understanding, the near-field sound pressure level difference can be expressed as the difference in sound pressure levels at the two sound guide holes of the acoustic output device 100.

[0071] In some embodiments, the near-field sound pressure level test method can be to measure the sound pressure of the sounds (the first sound and the second sound) radiated from the two sound guide holes at a specific frequency point (for example, 1000 Hz), and then calculate (for example, take the common logarithm of the ratio of the sound pressure to be measured to the reference sound pressure, and then multiply it by 20 to obtain the sound pressure level) to obtain the sound pressure level difference between the first sound and the second sound. In some embodiments, when testing the sound of a certain sound guide hole, a baffle can be used to separate the two sound guide holes to prevent the other sound guide hole from interfering with the test. The sound pressure at the sound guide hole can be understood as the sound pressure at a position close to the sound guide hole. For example, a sound collection device can be set to collect sound 4 mm away from the sound guide hole as the sound pressure at the sound guide hole.

[0072] In some embodiments, when testing the sound from two sound guide holes, the locations 4 cm from each of the two sound guide holes (i.e., the collection locations) can be located in opposite directions of the acoustic output device 100 (for example, the location 4 cm from the first acoustic hole is in the direction of the second acoustic hole pointing toward the first acoustic hole, and the location 4 cm from the second acoustic hole is in the direction of the first acoustic hole pointing toward the second acoustic hole). A sound collection device is placed at each of the two collection locations to collect the sound pressure level of the acoustic output device 100, and the difference between the two sound pressure levels is calculated, which is the near-field sound pressure level difference of the two sound guide holes.

[0073] In some embodiments of the present specification, by controlling the near-field sound pressure of the sounds radiated from the two sound guide holes to be similar, it is possible to ensure that the first sound and the second sound effectively interfere with each other in a specific direction of the far field, thereby effectively reducing sound leakage of the acoustic output device 100 in the far field.

[0074] The near-field sound pressure level difference can be adjusted in a variety of ways. In some embodiments, the near-field sound pressure level difference can be adjusted by adjusting the opening area ratio of the two sound guide holes.

[0075] The opening area ratio refers to the ratio of the area S1 of a certain sound guide hole to the area S2 of another sound guide hole, that is, the opening area ratio is equal to S1 / S2.

[0076] In some embodiments, the ratio of the opening areas of the two sound guide holes (i.e., the opening area ratio) can be 0.2, 0.5, 1, 1.5, 2, 2.5, etc. In some embodiments, the ratio of the opening areas of the two sound guide holes can range from 0.5 to 2. By controlling the range of the opening area ratio of the two sound guide holes so that the opening areas of the two sound guide holes are close, the acoustic impedance of the two sound guide holes can be made close, thereby reducing the near-field sound pressure level difference between the two sound guide holes, thereby making the far-field sound leakage cancellation more significant, and improving the effect of reducing far-field sound leakage.

[0077] Furthermore, the ratio of the opening areas of the two sound guide holes can be in the range of 0.8-1.25, 0.9-1.1, or 0.95-1.1. By further reducing the ratio of the opening areas of the two sound guide holes, the near-field sound pressure level difference is reduced, which can further improve the effect of reducing far-field sound leakage.

[0078] In some embodiments, the near-field sound pressure level difference can also be adjusted by adjusting the difference in acoustic loads between the two sound-conducting holes. Acoustic load refers to the ratio of the sound pressure value P1 after passing through the sound-conducting hole to the sound pressure value P0 before passing through the sound-conducting hole, that is, the acoustic load is equal to P1 / P0. It should be noted that for a particular sound-conducting hole, the greater the acoustic load (or the closer it is to 1), the lower its acoustic impedance.

[0079] In some embodiments, the acoustic load can be based on the sound pressure value when the sound guide hole is covered with gauze (equivalent to P1) and the sound pressure value when it is not covered with gauze (equivalent to P0) measured at a specific distance, and the acoustic load of the sound guide hole is determined by calculating the ratio of P1 to P0. Specifically, when testing the sound of the sound guide hole, the sound collection device can be set at a distance of 4-5 mm from the sound guide hole, and then the sound pressure value when the sound guide hole is covered with gauze (equivalent to P1) and the sound pressure value when it is not covered with gauze (equivalent to P0) are collected respectively, and finally the acoustic load of the sound guide hole is calculated. It should be noted that the test signal of the acoustic load can select a single-frequency signal, in which one or more frequency points can be selected, including but not limited to 100Hz, 200Hz, 300Hz, 500Hz, 1000Hz, 2000Hz, 5000Hz and the resonant frequency of the acoustic output device 100; the test signal can also select white noise, pink noise, and swept frequency signal. It should be noted that in some embodiments, the measured sound pressure level needs to be converted into a sound pressure value first, and then the acoustic load is calculated. Alternatively, the sound pressure levels measured before and after the sound guide hole is covered with the gauze can be subtracted, and the sound load value of the sound guide hole can be calculated using a logarithmic formula.

[0080] In some embodiments, the difference in acoustic load between the two sound guide holes can include 0.1, 0.15, 0.2, etc. In some embodiments, the difference in acoustic load between the two sound guide holes can be less than 0.15. It can be understood that the smaller the difference in acoustic load between the two sound guide holes, the closer the acoustic impedance of the two sound guide holes, and thus the smaller the difference in near-field sound pressure levels between the two sound guide holes, and the more significant the effect of reducing far-field sound leakage.

[0081] Furthermore, the difference in the acoustic load of the two sound-conducting holes can be less than 0.1. By further narrowing the difference range of the acoustic load of the two sound-conducting holes, the near-field sound pressure level difference of the two sound-conducting holes can be further reduced, thereby further improving the effect of reducing far-field sound leakage. In order to reduce the power consumption of the acoustic output device 100, the crossover point can be moved toward high frequency. When the crossover point moves toward high frequency, that is, the air-conducted sound waves output by the acoustic output device 100 contain more high-frequency components, at this time, the sound leakage of the acoustic output device 100 in the far field gradually increases. Therefore, when the crossover point moves toward high frequency, the difference in the acoustic load of the two sound-conducting holes can be reduced, thereby further improving the effect of reducing far-field sound leakage to ensure the output performance of the acoustic output device 100.

[0082] In some embodiments, to reduce the power consumption of the acoustic output device 100, the crossover frequency can be set between 600Hz and 1kHz. In this case, to minimize far-field sound leakage from the acoustic output device 100, the difference in acoustic load between the two sound guide holes can be 0-0.12. In some embodiments, to further reduce the power consumption of the acoustic output device 100, the crossover frequency can be set between 1kHz and 1.5kHz. In this case, to minimize far-field sound leakage from the acoustic output device 100 (or the air conduction oscillator 12), the difference in acoustic load between the two sound guide holes can be 0-0.1. In some embodiments, to further reduce the power consumption of the acoustic output device 100, the crossover frequency can be set between 1.5kHz and 2.5kHz. In this case, to minimize far-field sound leakage from the acoustic output device 100 (or the air conduction oscillator 12), the difference in acoustic load between the two sound guide holes can be 0-0.07. In some embodiments, in order to reduce the power consumption of the acoustic output device 100, the crossover point can be set in the range of 2.5kHz-4kHz. At this time, in order to reduce the sound leakage of the acoustic output device 100 (or the air conduction vibrator 12) in the far field, the difference in the acoustic load of the two sound-conducting holes can be 0-0.05.

[0083] In some embodiments, the near-field sound pressure level difference can also be adjusted by adjusting the ratio of the surface acoustic loads of the two sound guide holes.

[0084] The surface acoustic load refers to the product of the ratio of the sound pressure value P1 after passing through the sound guide hole to the sound pressure value P0 before passing through the sound guide hole and the area S of the sound guide hole. That is, the surface acoustic load is equal to S×P1 / P0.

[0085] In some embodiments, the ratio of the surface acoustic loads of the two sound guide holes can be 0.5, 1, 2.5, etc. In some embodiments, the ratio of the surface acoustic loads of the two sound guide holes can range from 0.5 to 3.5. By adjusting the surface acoustic load ratio of the two sound guide holes to maintain it within an appropriate ratio range, the acoustic impedances of the two sound guide holes can be made closer, thereby reducing the near-field sound pressure level difference between the two sound guide holes and improving the effect of reducing far-field sound leakage.

[0086] Furthermore, the ratio of the surface acoustic loads of the two sound-conducting holes can be in the range of 0.8-2. It can be understood that by further narrowing the ratio range of the surface acoustic loads of the two sound-conducting holes, the effect of reducing far-field sound leakage can be made more significant. In order to reduce the power consumption of the acoustic output device 100, the crossover point can be moved toward high frequency. When the crossover point moves toward high frequency, that is, the air-conducted sound waves output by the acoustic output device 100 contain more high-frequency components, at this time, the sound leakage of the acoustic output device 100 in the far field gradually increases. Therefore, when the crossover point moves toward high frequency, the ratio of the surface acoustic loads of the two sound-conducting holes can be reduced, thereby further improving the effect of reducing far-field sound leakage to ensure the output performance of the acoustic output device 100.

[0087] In some embodiments, to reduce the power consumption of the acoustic output device 100, the crossover frequency can be set between 600 Hz and 1 kHz. In this case, to minimize far-field sound leakage from the acoustic output device 100, the ratio of the surface acoustic loads of the two sound guide holes can be in the range of 0.5-3.5. In some embodiments, to further reduce the power consumption of the acoustic output device 100, the crossover frequency can be set between 1 kHz and 1.5 kHz. In this case, to minimize far-field sound leakage from the acoustic output device 100 (or the air conduction oscillator 12), the ratio of the surface acoustic loads of the two sound guide holes can be in the range of 0.6-2.7. In some embodiments, to further reduce the power consumption of the acoustic output device 100, the crossover frequency can be set between 1.5 kHz and 2.5 kHz. In this case, to minimize far-field sound leakage from the acoustic output device 100 (or the air conduction oscillator 12), the ratio of the surface acoustic loads of the two sound guide holes can be in the range of 0.7-2. In some embodiments, in order to reduce the power consumption of the acoustic output device 100, the crossover point can be set in the range of 2.5kHz-4kHz. At this time, in order to reduce the sound leakage of the acoustic output device 100 (or the air conduction vibrator 12) in the far field, the ratio of the surface acoustic load of the two sound-conducting holes can be in the range of 0.9-1.2.

[0088] In some embodiments of the present specification, by adjusting the acoustic load difference range and / or the surface acoustic load ratio of the two sound guide holes, the acoustic impedance of the two sound guide holes is made closer, thereby reducing the near-field sound pressure level difference of the two sound guide holes, making the constructed dipole or dipole-like sound field more directional in the far field, thereby improving the effect of reducing far-field sound leakage.

[0089] In some embodiments, in order to further reduce the sound leakage of the acoustic output device 100 in the far field, the first sound guide hole 1080 and the second sound guide hole 1081 can be made to radiate sounds with phase difference and / or amplitude difference to the outside world, so as to further adjust the sound field radiated by the dipole or quasi-dipole. Specifically, the phase difference between the two sounds output from the two sound guide holes of the acoustic output device 100 can be adjusted to change the degree of cancellation of the sound output by the acoustic output device 100 in the far field, and when the phase difference meets certain conditions, the acoustic output device 100 can be kept in a certain direction (for example, in the direction of the user's ear canal) while outputting a high volume, while suppressing the sound leakage output by the acoustic output device 100 in the opposite direction, so that the sound radiated to the outside world by the first sound guide hole 1080 and the second sound guide hole 1081 presents strong directionality in the radiation space. Strong directivity can be manifested as the sound radiated from the two sound guide holes having a far-field sound pressure level difference of not less than 3dB in at least one pair of opposite directions (for example, the direction of the ear canal and the opposite direction thereof). This can make the volume in the direction of the user's ear canal higher, and the sound leakage in the opposite direction of the user's ear canal and in other directions smaller, thereby better balancing the openness of the ear canal and the privacy of listening.

[0090] The far-field sound pressure level difference refers to the difference in sound pressure levels of the sounds radiated by the two sound guide holes in the far field. In this application, the far field of the sound guide hole can refer to a position more than 10 cm away from the sound guide hole. For ease of understanding, the far-field sound pressure level difference of the two sound guide holes can be expressed as the difference in sound pressure levels at a longer distance (or symmetrical position) from the two holes in the direction of the line connecting the two sound guide holes, which is the same or approximately the same. The test method for the far-field sound pressure level difference is similar to the test method for the near-field sound pressure level difference, and the similarities will not be repeated. The difference is that when measuring the far-field sound pressure level, for example, when collecting the sound of the first sound guide hole 1080 (or the second sound guide hole 1081), the sound collection device can be set at 30 cm away from the first sound guide hole 1080 (or the second sound guide hole 1081) for collection.

[0091] In some embodiments, the far-field sound pressure level difference of the two sound guide holes can be controlled by setting the amplitude difference and phase difference of the sounds emitted by the two sound guide holes.

[0092] It should be noted that the phase of the sound radiated from the sound guide hole (including the first sound guide hole 1080 and the second sound guide hole 1081) described in the embodiments of this specification may refer to the phase measured at a distance of 4 mm from the sound guide hole (or the geometric center of the sound guide hole) (for example, 4 mm in front of the sound guide hole). In some embodiments, the phase difference test method may be to measure the phases of the sounds radiated from the two sound guide holes (the first sound and the second sound, respectively), and then calculate the phase difference between the first sound and the second sound. When testing the sound of the first sound guide hole 1080 (or the second sound guide hole 1081), a baffle may be used to separate the first sound guide hole 1080 and the second sound guide hole 1081 to prevent the second sound guide hole 1081 (or the first sound guide hole 1080) from interfering with the test. Furthermore, the sound collection device can be placed on the line connecting the first sound guide hole 1080 and the second sound guide hole 1081 and 4 mm away from the first sound guide hole 1080 (or the second sound guide hole 1081) to collect the first sound, further avoiding the second sound guide hole 1081 (or the first sound guide hole 1080) from interfering with the test. As an example only, the size of the baffle can be of standard size. For example, the length, width and height of the baffle can be 1650 mm, 1350 mm and 30 mm respectively. It should be further explained that when the number of first sound guide holes 1080 (or second sound guide holes 1081) is two or more, any one of them can be selected for testing. For example, a first sound guide hole 1080 and a second sound guide hole 1081 located at a specific relative position (such as the minimum or maximum relative distance) can be selected to test the phase of the sound emitted by each of them, and calculate the phase difference. In addition, sound measurement within a specific frequency band (for example, 1000Hz-8000Hz) does not have to be achieved through exhaustive enumeration, but can be achieved by setting multiple (for example, 20-30) frequency sampling points with equal step sizes and endpoints at the frequency band endpoints, and measuring the sound at each sampling point separately.

[0093] In some embodiments of the present specification, a higher frequency crossover point is set so that most of the acoustic output of the acoustic output device 100 is output by the air conduction vibrator 12 in the form of air-conducted sound waves, which can greatly reduce its power consumption. At the same time, a dipole (two sound-conducting holes) output structure is adopted to reduce its sound leakage. Under the premise of ensuring low power consumption of the acoustic output device 100, it has a strong sound leakage reduction capability at medium and low frequencies (for example, 20Hz-2.5kHz), and has an overall low sound leakage performance.

[0094] When the crossover point is greater than a certain frequency, the air-conducted sound waves near the crossover point have higher frequency components. In the higher frequency band, due to the influence of the sound output characteristics of the cavities corresponding to the two sound-conducting holes (for example, more different modes will be generated in the higher frequency band), it is difficult to keep the amplitude of the sound output from the two sound-conducting holes the same. At the same time, it is also difficult to stably maintain a phase difference of 180°, which makes the directivity of the sound in the far field worse and the ability to reduce sound leakage worse. Therefore, in some embodiments, in order to ensure that the acoustic output device 100 has sufficient sound leakage reduction capability, the crossover point is not higher than 4kHz. In some embodiments, in order to ensure that the acoustic output device 100 has better sound leakage reduction capability, the crossover point is not higher than 3kHz.

[0095] In some examples of this specification, by limiting the crossover frequency to no higher than 4kHz, the far-field sound pressure level difference of the two sound guide holes can meet the requirements to ensure the directionality of the sound in the far field, thereby ensuring that the acoustic output device 100 has sufficient sound leakage reduction capability.

[0096] In some embodiments, referring again to FIG3 , the vibration direction of the bone conduction vibrator 11 is arranged to intersect with the vibration direction of the air conduction vibrator 12. The first housing 101 and the second housing 102 cooperate with each other along the vibration direction of the bone conduction vibrator 11, and the third housing 103 cooperates with the first housing 101 and / or the second housing 102 along the vibration direction of the air conduction vibrator 12. Specifically, the vibration direction of the bone conduction vibrator 11 is arranged to intersect with the vibration direction of the air conduction vibrator 12. The vibration direction of the bone conduction vibrator 11 is hereinafter referred to as the first vibration direction X1, and the vibration direction of the air conduction vibrator 12 may be referred to as the second vibration direction X2. The first vibration direction X1 and the second vibration direction X2 are not parallel to each other but are arranged to intersect with each other, for example, perpendicularly or approximately perpendicularly (e.g., 90°±10°). When the bone conduction vibrator 11 and the air conduction vibrator 12 are working simultaneously, the bone conduction vibrator 11 and the air conduction vibrator 12 vibrate in the first vibration direction X1 and the second vibration direction X2, respectively. Since the vibration directions of the two are arranged crosswise, the impact of the vibration of the bone conduction vibrator 11 on the sound quality of the air conduction vibrator 12 caused by the two vibrating in the same direction can be effectively alleviated. Furthermore, the first shell 101 and the second shell 102 are assembled together along the first vibration direction X1, and the third shell 103 is assembled with the first shell 101 along the second vibration direction X2. For example, only the first shell 101 and the third shell 103 can be assembled together to form the accommodating cavity 1002, and the third shell 103 only has a mating relationship with the first shell 101 along the second vibration direction X2. Similarly, in other embodiments of the shell 10, the third shell 103 should have a mating relationship with the shells that participate in forming the accommodating cavity 1002 along the second vibration direction X2. This method is conducive to the assembly of the movement assembly 1, thereby improving the assembly efficiency of the movement assembly 1.

[0097] Figure 4 is a schematic cross-sectional view of a movement assembly along the AA cross-sectional direction according to some embodiments of this specification. Figure 5A is a schematic cross-sectional view of a movement assembly along the AA cross-sectional direction according to other embodiments of this specification. Figure 5B is a schematic structural view of a movement assembly according to other embodiments of this specification.

[0098] In some embodiments, as shown in Figures 4, 5A, and 5B, the bone conduction vibrator 11 includes a first magnetic circuit 111, a vibrating plate 112, and a first coil 113. The first coil 113 extends into the magnetic gap of the first magnetic circuit 111 along a first vibration direction X1. The housing 10 is connected to the magnetic shield 1112 of the first magnetic circuit 111. When the first coil 113 is energized, the magnetic field generated by the interaction with the magnetic field formed by the first magnetic circuit 111 drives the vibrating plate 112 to vibrate along the first vibration direction X1. This causes the magnetic shield 1112 to vibrate under the action of a reaction force and transmits the vibration to the housing 10. The housing 10 transmits bone-conducted sound waves through contact with the user's skin.

[0099] In some embodiments, the first magnetic circuit 111 may include a magnet 1111 and a magnetic cover 1112. For example, in the embodiment shown in FIG4 , the magnetic cover 1112 is a cylindrical structure, the magnetic cover 1112 can be sleeved outside the first coil 113, and the magnet 1111 can be set inside the first coil 113. The magnetic cover 1112 and the magnet 1111 are spaced apart in a direction perpendicular to the first vibration direction X1. A magnetic gap of the first magnetic circuit 111 is formed between the inner side wall of the magnetic cover 1112 and the outer side of the magnet 1111, and the first coil 113 is located in the magnetic gap. In some embodiments, the magnetic cover 1112 is connected to the inner wall of the shell 10 (such as the first shell 101 and / or the second shell 102, etc.) to achieve the fixation of the magnetic cover 1112. In the embodiment shown in FIG4 , the two vibration transmission plates 112 are respectively fixed to the two ends of the cylindrical structure of the magnetic cover 1112. In some embodiments, both ends of the magnetic cover 1112 can also be sealed so that the space enclosed by the magnetic cover 1112 forms a closed space, so that the sound generated in the first magnetic circuit 111 does not leak out. In some embodiments, the first coil 113 can be arranged around an axis parallel to the first vibration direction X1 of the bone conduction vibrator 11 and sleeved on the outside of the magnet 1111. In some embodiments, the magnetic cover 1112 is arranged around an axis parallel to the first vibration direction X1 of the bone conduction vibrator 11 and sleeved on the outside of the first coil 113, that is, the magnetic cover 1112 and the magnet 1111 are spaced apart in a direction perpendicular to the first vibration direction X1 of the bone conduction vibrator 11. Specifically, the first coil 113 can be connected to the magnetic cover 1112. In some embodiments of the present specification, the first coil 113 is attached to the inner wall of the magnetic cover 1112.

[0100] In some embodiments, the magnet 1111 is fixed by the vibration plate 112. For example, the vibration plate 112 and the first magnetic circuit 111 can be arranged along the first vibration direction X1, and the side of the vibration plate 112 perpendicular to the first vibration direction X1 can be connected to the side of the magnet 1111 perpendicular to the first vibration direction X1 to achieve the fixation of the magnet 1111.

[0101] In some embodiments, as shown in Figures 4 and 5A, the vibrating piece 112 may include a first vibrating piece 1121 and a second vibrating piece 1122. In the first vibration direction X1 of the bone conduction vibrator 11, the first vibrating piece 1121 and the second vibrating piece 1122 may be connected to the magnet 1111 from opposite sides of the magnet 1111, respectively. In some embodiments, the first vibrating piece 1121 and the second vibrating piece 1122 are symmetrically arranged on both sides of the first magnetic circuit 111. For example, the first vibrating piece 1121 and the second vibrating piece 1122 are symmetrically arranged on both sides of the first magnetic circuit 111 along the first vibration direction X1. In some embodiments, to facilitate wearing, the symmetry axes of the first vibrating piece 1121 and the second vibrating piece 1122 and the central axis of the air conduction vibrator 12 may be spaced apart in the first vibration direction X1 to increase the ventilation volume of the second sound guide hole 1081 and / or the air flow channel 1081a.

[0102] In some other embodiments of the present application, the bone conduction vibrator 11 may include only one vibrating plate 112. In this case, the magnetic cover 1112 may be a cylindrical structure with one end closed and the other end open. The vibrating plate 112 may be arranged on one side of the opening of the magnetic cover 1112. The magnet 1111 may be located inside the magnetic cover 1112. The first coil 113 may extend into the magnetic gap formed between the inner wall of the magnetic cover 1112 and the outer side of the magnet 1111. The shell 10 is connected to the magnetic cover 1112 through the vibrating plate 112. After the first coil 113 is energized, the magnetic field generated interacts with the magnetic field formed by the first magnetic circuit 111, driving the vibrating plate 112 to generate vibration along the first vibration direction X1 and transmitting it to the shell 10 through the magnetic cover 1112. The shell 10 transmits bone-conducted sound waves through contact with the user's skin.

[0103] In some embodiments, as shown in Figures 4, 5A, and 5B, the air-conducting vibrator 12 includes a second magnetic circuit 121, a diaphragm 122, a second coil 123, and a frame 124. The frame 124 is used to provide a mounting platform. The second magnetic circuit 121, the diaphragm 122, and the second coil 123 are connected to the housing 10 via the frame 124. The diaphragm 122 covers the second coil 123 and the second magnetic circuit 121 in the second vibration direction X2. The second coil 123 extends into the magnetic gap of the second magnetic circuit 121 and is connected to the diaphragm 122. When the second coil 123 is energized, the magnetic field generated by the second coil 123 interacts with the magnetic field formed by the second magnetic circuit 121, driving the diaphragm 122 to generate mechanical vibrations along the second vibration direction X2. Sound is generated through a medium such as air, and the sound is output through the sound guide hole.

[0104] In some embodiments, the second magnetic circuit 121 includes a magnet 1211 and a magnetic cover 1212. The side of the magnet 1211 away from the diaphragm 122 is mounted on the bottom wall of the magnetic cover 1212, and a magnetic gap of the second magnetic circuit 121 is formed between the circumferential side of the magnet 1211 and the circumferential inner wall of the magnetic cover 1212. In some embodiments, the circumferential outer wall of the magnetic cover 1212 is connected and fixed to the basin 124. In some embodiments, a folding ring 1221 is provided on the circumferential side of the diaphragm 122, and the diaphragm 122 is connected and fixed to the basin 124 via the folding ring 1221. In some embodiments, the basin 124 is connected and fixed to the inner wall of the shell 10 (for example, the second shell 102 and / or the third shell 103).

[0105] In some embodiments of this specification, the vibrating plate 112 vibrates along a first vibration direction X1, and the diaphragm 122 vibrates along a second vibration direction X2. The first vibration direction X1 and the second vibration direction X2 are arranged in an intersecting manner, with a certain angle between them. This can prevent the vibrations of the bone and air conduction vibrators from interfering with each other, thereby ensuring the sound production efficiency and frequency accuracy of the bone and air conduction vibrators. In some embodiments, to minimize the impact of the interaction between the vibrations of the bone conduction vibrator 11 and the air conduction vibrator 12 on the acoustic output performance of the acoustic output device 100, the angle between the first vibration direction X1 and the second vibration direction X2 is in the range of 80°-100°. In some embodiments, the angle between the first vibration direction X1 and the second vibration direction X2 is in the range of 85°-95°. In some embodiments, the angle between the first vibration direction X1 and the second vibration direction X2 is in the range of 88°-92°. In practical applications, in order to minimize the mutual influence of vibrations between the bone conduction vibrator 11 and the air conduction vibrator 12, the first vibration direction X1 should be as perpendicular to the second vibration direction X2 as possible. For example, in the embodiment shown in Figure 4, the angle between the first vibration direction X1 and the second vibration direction X2 is 90°.

[0106] In some embodiments, the second magnetic circuit 121 of the air conduction vibrator 12 is located on the side of the diaphragm 122 away from the bone conduction vibrator 11. Specifically, the second coil 123, the basket 124 and the second magnetic circuit 121 are all located on the side of the diaphragm 122 away from the bone conduction vibrator 11.

[0107] In some embodiments of this specification, since the diaphragm 122 covers the second coil 123 and the second magnetic circuit 121 in the second vibration direction X2, that is, the area of ​​the diaphragm 122 in the second vibration direction X2 is larger than the area of ​​the second magnetic circuit 121 in the second vibration direction X2, by arranging the second magnetic circuit 121 of the air conduction vibrator 12 on the side of the diaphragm 122 facing away from the bone conduction vibrator 11, it is convenient to configure area A of the housing 10 (see Figures 4, 5A, and 5B, where area A is located at the junction of the diaphragm 122 and the second magnetic circuit 121) as a chamfered structure, thereby making the structural distribution of the bone conduction vibrator 11 and the air conduction vibrator 12 within the housing 10 more reasonable and compact. When the user wears the acoustic output device 100, area A of the housing 10 is located at the user's tragus. The chamfered area A can adapt to the shape of the tragus, preventing the acoustic output device 100 from squeezing the tragus, thereby improving the user's wearing comfort. In addition, by arranging the second magnetic circuit 121 of the air conduction vibrator 12 on the side of the diaphragm 122 away from the bone conduction vibrator 11 , the low-frequency sound of the acoustic output device 100 can be enhanced, further improving the acoustic output effect of the acoustic output device 100 .

[0108] In some embodiments, as shown in Figures 4, 5A, and 5B, to ensure the pressure relief effect of the second sound guide hole 1081, the center of mass of the bone conduction vibrator 11 and the center of mass of the air conduction vibrator 12 can be spaced apart in the first vibration direction X1. This can also be understood as the bone conduction vibrator 11 and the air conduction vibrator 12 being staggered in the first vibration direction X1, thereby increasing the airflow through the second sound guide hole 1081 and / or the air flow channel 1081a. Furthermore, the staggered arrangement of the bone conduction vibrator 11 and the air conduction vibrator 12 in the first vibration direction X1 can further facilitate a more rational and compact structural distribution of the bone conduction vibrator 11 and the air conduction vibrator 12 within the housing 10, resulting in a more aesthetically pleasing appearance of the acoustic output device 100.

[0109] In some embodiments, the center of mass of the bone conduction vibrator 11 and the center of mass of the air conduction vibrator 12 can be aligned in the second vibration direction X2. In order to increase the ventilation volume of the second sound guide hole 1081 and / or the air flow channel 1081a, thereby increasing the pressure relief effect of the second sound guide hole 1081, the bone conduction vibrator 11 and the air conduction vibrator 12 can rotate relative to each other. In this case, the angle formed between the short axis direction of the bone conduction vibrator 11 (or the vibrating plate 112) and the vibration direction of the diaphragm 122 of the air conduction vibrator 12 can range from 0° to 30°. In some embodiments, the angle formed between the short axis direction of the bone conduction vibrator 11 (or the vibrating plate 112) and the vibration direction of the diaphragm 122 of the air conduction vibrator 12 can range from 1° to 20°. In some embodiments, the angle formed between the short axis direction of the bone conduction vibrator 11 (or the vibrating plate 112) and the vibration direction of the diaphragm 122 of the air conduction vibrator 12 can range from 2° to 10°.

[0110] By rotating the bone conduction vibrator 11 and the air conduction vibrator 12 relative to each other, the distance between the center point of the corner formed by the first side wall 1001a of the bone conduction vibrator 11 facing the second sound guide hole 1081 and the second side wall 1001b close to the diaphragm 122 to the vertex of the fold ring 122 of the air conduction vibrator 12 can be increased, thereby increasing the cross-sectional area of ​​the air flow channel 1081a, and then increasing the ventilation volume of the air flow in the air flow channel 1081a, so that the front cavity of the air conduction vibrator 12 can have a better pressure relief effect, thereby improving the low-frequency effect of the air conduction vibrator 12.

[0111] Figure 6 is a schematic cross-sectional view of a core assembly along the BB section according to some embodiments of the present specification. Figure 7 is a schematic cross-sectional view of a second sound guide hole according to some embodiments of the present specification.

[0112] In some embodiments, the air conduction oscillator 12 is disposed in the accommodating cavity 1002. The diaphragm 122 divides the accommodating cavity 1002 into a rear cavity 1004 and a front cavity 1003 located on opposite sides of the diaphragm 122. The rear cavity 1004 is located on the side of the diaphragm 122 facing away from the partition wall 1012, and the front cavity 1003 is located between the diaphragm 122 and the partition wall 1012. A first sound guide hole 1080 connects the rear cavity 1004 with the external environment, and a second sound guide hole 1081 connects the front cavity 1003 with the external environment. When the diaphragm 122 vibrates along the air conduction vibration direction X2, the front cavity 1003 can be decompressed through the second sound guide hole 1081.

[0113] In some embodiments, the first sound guide hole 1080 is disposed on the portion of the housing 10 that forms the rear cavity 1004. In some embodiments, the second magnetic circuit 121 is located in the rear cavity 1004, and the first sound guide hole 1080 is located on the side wall of the housing 10 that faces the bottom wall of the magnetic shield 1212 (or the second magnetic circuit 121). With this arrangement, when a user wears the acoustic device 100, the first sound guide hole 1080 can be oriented toward the user's ear canal, thereby allowing the air-conducted sound waves output by the air-conducting vibrator 12 to be better transmitted into the user's ear canal.

[0114] In some embodiments, in order to avoid or reduce the mutual influence of the sounds output by the second sound guide hole 1081 and the first sound guide hole 1080 in the near field, the second sound guide hole 1081 can be set as far away from the first sound guide hole 1080 as possible, under the premise of ensuring that the second sound guide hole 1081 is connected to the front cavity 1003. In some embodiments, the second sound guide hole 1081 can be set on the side wall of the shell 10 away from the ear hook component 2 along the extension direction of the ear hook component 2 (also referred to as the lower side wall, such as the lower side wall 104 shown in Figure 9). In some embodiments, the second sound guide hole 1081 can be set on the part of the shell 10 that forms the front cavity 1003 and is close to the partition wall 1012. When the user wears the acoustic device 100, the second sound guide hole 1081 is away from the ear hook component 2 and close to the user's earlobe, which can make the second sound guide hole 1081 away from the user's ear canal, avoiding or reducing the impact of the sound output by the second sound guide hole 1081 on the user's hearing.

[0115] In some embodiments, at least a portion of the partition wall 1012 can extend toward the side where the accommodating cavity 1001 is located, and form a portion of the hole wall of the second sound guide hole 1081. The airflow channel 1081a of the second sound guide hole 1081 is configured to extend toward the side where the accommodating cavity 1001 is located. Through this configuration, the second sound guide hole 1081 can be further away from the first sound guide hole 1080, which can effectively reduce the impact of the second sound guide hole 1081 on the first sound guide hole 1080 and improve the user's listening volume. In addition, the airflow channel 1081a of the second sound guide hole 1081 is configured to extend toward the side where the accommodating cavity 1001 is located, which can gradually increase the cross-sectional size of the airflow channel 1081a in the direction from the inlet end to the outlet end, thereby ensuring the ventilation volume of the second sound guide hole 1081 and thus ensuring a good pressure relief effect.

[0116] In the embodiment of the present specification, by arranging the second sound guide hole 1081 on the side wall of the shell 10 away from the ear hook assembly 2, the second sound guide hole 1081 is arranged as far away from the first sound guide hole 1080 as possible, thereby avoiding or reducing the impact of the sound output by the second sound guide hole 1081 on the user's listening, and improving the listening volume.

[0117] FIG8 is a schematic diagram of the location of the second sound guide hole according to some embodiments of this specification.

[0118] In some embodiments, as shown in FIG8 , the second sound guide hole 1081 can also be provided on the outer side wall of the housing 10. The outer side wall is the side wall of the housing 10 that is away from the user's face when the device is worn. Since the first sound guide hole 1080 is provided on the side wall of the housing 10 that faces the user's ear canal, the second sound guide hole 1081 is provided on the side wall of the housing 10 that is away from the user's ear. The second sound guide hole 1081 is provided away from the user's ear canal so that the sound output by the second sound guide hole 1081 does not affect the hearing of the ear canal, thereby ensuring the user's listening quality.

[0119] In some embodiments, the acoustic output device 100 may include two or more second sound guide holes that communicate with the front cavity 1003. The multiple second sound guide holes may be disposed on any side wall of the housing 10. For example, the acoustic output device 100 may include two second sound guide holes, one of which may be disposed on the outer side wall and the other on the lower side wall. For another example, the acoustic output device 100 may include two second sound guide holes, both of which may be disposed on the lower side wall.

[0120] In some embodiments, the second sound guide hole 1081 is connected to the front cavity 1003 through the air flow channel 1081a. In some embodiments, the vibrating plate 112 has a long axis direction L1 perpendicular to the first vibration direction X1 (see Figure 6). In the present application, the direction corresponding to the minimum dimension of the vibrating plate 112 is the short axis direction of the vibrating plate 112, and the direction perpendicular to its short axis direction is the long axis direction L1 of the vibrating plate 112. In order to allow the acoustic output device 100 to have enough space to set the air flow channel 1081a, the distance d1 between the lowest point of the bone conduction vibrator 11 and the lowest point of the outer opening of the second sound guide hole 1081 in the long axis direction L1 can be not less than 1.00 mm, for example, 1.2 mm, 1.35 mm, 1.5 mm, 1.65 mm, 2 mm, etc. The lowest point mentioned here can refer to the point farthest from the ear hook component 2 in the long axis direction L1 when worn.

[0121] In some embodiments of the present specification, by limiting the distance between the lowest point of the bone conduction vibrator 11 and the lowest point of the outer opening of the second sound guide hole 1081 in the long axis direction L1, the front cavity 1003 can have sufficient space to set the air flow channel 1081a, avoiding making the air flow channel 1081a of the second sound guide hole 1081 too narrow, so as to ensure that the front cavity 1003 has sufficient pressure relief output to cancel the sound of the first sound guide hole 1080 in the far field, thereby reducing far-field sound leakage.

[0122] In some embodiments, to ensure sufficient space in the front cavity 1003 for the airflow channel 1081a, the radius of curvature of the corner formed between the first side wall 1001a of the bone conduction vibrator 11 near the second sound guide hole 1081 and the second side wall 1001b near the diaphragm 122 can be greater than 1.00 mm. For example, the radius of curvature can be 1.2 mm, 1.5 mm, 1.8 mm, 2 mm, 2.5 mm, etc. In some embodiments, to ensure sufficient space in the front cavity 1003 for the airflow channel 1081a, the distance d2 from the center point of the corner formed between the first side wall 1001a of the bone conduction vibrator 11 near the second sound guide hole 1081 and the second side wall 1001b near the diaphragm 122 to the vertex of the surround 1221 of the diaphragm 122 in the second vibration direction X2 can be no less than 1.2 mm. For example, the distance d2 can be 1.5 mm, 1.8 mm, 2 mm, 2.5 mm, 3 mm, etc. The vertex of the edge 1221 refers to the point on the edge 1221 closest to the bone conduction vibrator 11. In some embodiments, to ensure that the front cavity 1003 has sufficient space for the airflow channel 1081a, the distance d3 from the center point of the corner formed by the first side wall 1001a of the bone conduction vibrator 11 near the second sound guide hole 1081 and the second side wall 1001b near the diaphragm 122 to the vertex of the edge 1221 of the diaphragm 122 can be no less than 1.5 mm. For example, the distance d3 can be 1.8 mm, 2 mm, 2.4 mm, 2.6 mm, 3 mm, etc.

[0123] In some embodiments of the present specification, by limiting the radius of curvature of the corner of the bone conduction vibrator 11 close to the second sound guide hole 1081, and / or limiting the distance from the center point of the corner of the bone conduction vibrator 11 close to the second sound guide hole 1081 to the apex of the fold 1221 of the diaphragm 122, the front cavity 1003 can have sufficient space to set the air flow channel 1081a, thereby avoiding making the air flow channel 1081a of the second sound guide hole 1081 too narrow, so as to ensure sufficient pressure relief output to cancel out the sound of the first sound guide hole 1080.

[0124] In some embodiments, the cross-sectional area of ​​the air flow channel 1081a of the second sound guide hole 1081 gradually increases in the direction from the accommodating cavity 1002 to the external environment. In other words, while the air flow channel 1081a extends obliquely toward one side of the accommodating cavity 1001, the cross-sectional area of ​​the air flow channel 1081a gradually increases in the direction from the accommodating cavity 1002 to the external environment, so that the gas is discharged more smoothly, thereby improving the sound quality of the sound output of the acoustic output device 100. In some embodiments, in order to ensure that the second sound guide hole 1081 has sufficient pressure relief output to cancel out the sound of the first sound guide hole 1080 in the far field, the minimum cross-sectional area of ​​the air flow channel 1081a of the second sound guide hole 1081 is not less than 5.3mm 2In some embodiments, to further ensure that the second sound guide hole 1081 has sufficient pressure relief output to cancel the sound of the first sound guide hole 1080 in the far field, the minimum cross-sectional area of ​​the air flow channel 1081a of the second sound guide hole 1081 is not less than 6mm 2 For example, the minimum cross-sectional area can be 6.2 mm 2 , 6.5mm 2 , 6.8mm 2 wait.

[0125] In some embodiments of the present specification, by limiting the minimum cross-sectional area of ​​the air flow channel 1081a, the second sound guide hole 1081 has sufficient sound output to cancel out the sound of the first sound guide hole 1080, thereby ensuring sufficient sound leakage reduction capability.

[0126] Figure 9 is a schematic diagram of a surface of a portion of a housing according to some embodiments of the present specification. Figure 10 is a schematic diagram of a surface of a portion of a housing according to some embodiments of the present specification.

[0127] In some embodiments, the acoustic output device 100 further includes a microphone that converts sound signals (sound waves) into audio signals. A microphone hole 1082 is provided on the housing 10 (e.g., the first housing 101, the second housing 102, and / or the third housing 103) of the acoustic output device 100. The microphone picks up external sounds through the microphone hole 1082.

[0128] In some embodiments, the microphone hole 1082 is positioned adjacent to the second sound guide hole 1081, and the microphone hole 1082 and the second sound guide hole 1081 are covered by the same steel mesh 110. This arrangement effectively increases the overall size and area of ​​the steel mesh 110, reducing the risk of sweat, rain, and other adverse external factors infiltrating the steel mesh 110 and forming a water film that could clog the second sound guide hole 1081. This effectively ensures that the second sound guide hole 1081 can properly perform pressure relief work, thereby effectively improving the stability of the sound output device 100. In addition, the fact that the microphone hole 1082 and the second sound guide hole 1081 are covered by the same steel mesh 110 can also give the acoustic output device 100 a better appearance. Furthermore, as shown in Figure 9, the steel mesh 110 can be set in an arc shape. When the user wears the acoustic output device 100, sweat, rainwater, etc. flowing through the steel mesh 110 will eventually drip or slide directly to the bottom of the steel mesh 110 (at the position of the second sound guide hole 1081) and then drip, thereby effectively preventing sweat, rainwater and other external adverse factors from accumulating on the steel mesh 110 and forming a blockage. In addition, setting the steel mesh 110 in an arc shape can effectively increase the kinetic energy of sweat, rainwater and other external adverse factors, thereby effectively preventing sweat, rainwater and other external adverse factors from accumulating on the steel mesh 110, causing blockage of the second sound guide hole 1081, and thus effectively improving the working stability of the acoustic output device 100.

[0129] In some embodiments, the housing 10 is provided with a first recessed portion 1004 , which is in communication with the second sound guide hole 1081 and the air flow channel 1081 a , and the steel mesh 110 also covers the opening of the first recessed portion 1004 . Based on this, when the liquid blocks a part of the steel mesh 110, since the first recessed portion 1004 is connected to the air flow channel 1081a, the sound of the front cavity 1003 can be output outward from the first recessed portion 1004 through the air flow channel 1081a. That is to say, the first recessed portion 1004 can serve as an auxiliary pressure relief hole of the air conduction vibrator 12, which can effectively increase the pressure relief area of ​​the second sound guide hole 1081, and when the second sound guide hole 1081 is blocked, the air conduction vibrator 12 can continue to relieve pressure through the first recessed portion 1004, thereby ensuring the sound leakage reduction capability of the acoustic output device 100, and effectively reducing the probability and degree of loss of low-frequency sound of the acoustic output device 100, thereby effectively improving the working stability of the acoustic output device 100.

[0130] In some embodiments, the first recessed portion 1004, the microphone hole 1082 and the second sound guide hole 1081 are completely covered by the steel mesh 110, which can effectively prevent external factors such as sweat and rain from clogging the second sound guide hole 1081 and the first recessed portion 1004, and effectively prevent other external granular adverse factors from entering the front cavity 1003 along the second sound guide hole 1081 and the first recessed portion 1004 to cause damage to the air conduction vibrator 12, thereby effectively improving the stability of the sound emission of the acoustic output device 100. Among them, the steel mesh 110 is set to a curved shape based on the above method, so that sweat, rainwater and other external adverse factors flowing through the steel mesh 110 will eventually drip directly or slide to the bottom of the steel mesh 110 and then drip, thereby effectively preventing sweat, rainwater and other external adverse factors from accumulating on the steel mesh 110 and forming crystals, and setting the steel mesh 110 into a curved shape can effectively increase the kinetic energy of sweat, rainwater and other external adverse factors, thereby effectively preventing sweat, rainwater and other external adverse factors from accumulating on the steel mesh 110, causing clogging of the second sound guide hole 1081 and other phenomena, thereby effectively improving the working stability of the acoustic output device 100.

[0131] In some embodiments, at least a portion of the microphone hole 1082 may be located closer to the earhook assembly 2 relative to the second sound guide hole 1081. When liquids such as sweat and rainwater flow along the surface of the housing 10 to the bottom of the steel mesh 110 (or the bottom of the housing 10), at least a portion of the microphone hole 1082 may be located closer to the earhook assembly 2 relative to the second sound guide hole 1081. That is, when the acoustic output device 100 is in a worn state, the microphone hole 1082 is not directly below the earhook assembly 2 when the acoustic output device 100 is in a worn state. Therefore, the steel mesh 110 extending to the position of the microphone hole 1082 is not easily clogged, and the gas in the airflow channel 1081a can be transmitted through the second sound guide hole 1081 to the steel mesh extending to the position of the microphone hole 1082 and output outward, thereby ensuring the normal operation of the air conduction vibrator 12.

[0132] In some embodiments of the present specification, by increasing the area of ​​the steel mesh 110 or forming a cavity between the outer surface of the steel mesh 110 and the outer surface of the shell 10, the steel mesh 110 can be prevented from being completely blocked by the liquid, so as to ensure that the sound of the second sound guide hole 1081 can be output smoothly, thereby ensuring the sound leakage reduction capability of the acoustic output device 100.

[0133] FIG11 is a diagram showing the effect of the crossover frequency on the power consumption of an acoustic output device according to some embodiments of this specification. In FIG11 , the horizontal axis represents the output volume of the acoustic output device 100 (the numerical value reflects the number of volume levels), and the vertical axis represents the power consumption current of the acoustic output device 100. The larger the current, the greater the power consumption. Curve 1 represents the power consumption at a standard volume when the target product has a battery life of 10 hours, and curve 2 represents the power consumption at a standard volume when the target product has a battery life of 12 hours. Curves 3, 4, 5, and 6 represent the power consumption current of the acoustic output device 100 when the crossover frequency is 2kHz, 1.5kHz, 1kHz, and 500Hz, respectively. As can be seen from FIG11 , as the output volume (number of volume levels) increases, the power consumption shows an upward trend. At the same time, as the crossover frequency increases, the power consumption at the same output volume decreases significantly. When the crossover frequency is 2kHz, that is, curve 3 is lower than curve 2 at 11 to 12 volume levels and is close to curve 1. In addition, as the crossover frequency increases, the power consumption current increases more slowly with volume. This shows that increasing the crossover frequency also has the advantage of reducing power consumption at high volume.

[0134] Therefore, in some embodiments, the crossover point can be set to no less than 1kHz, 2kHz, etc., and a dipole (two sound-conducting holes) output structure is used to reduce the sound leakage of the acoustic output device 100, so that under the premise of ensuring low power consumption, the acoustic output device 100 has a strong ability to reduce sound leakage in medium and low frequencies (for example, 20Hz-2.5kHz), and has an overall lower sound leakage performance.

[0135] While the basic concepts have been described above, it will be apparent to those skilled in the art that the detailed disclosure is merely illustrative and does not limit this specification. Although not explicitly stated herein, various modifications, improvements, and revisions to this specification may be made by those skilled in the art. Such modifications, improvements, and revisions are suggested in this specification and remain within the spirit and scope of the exemplary embodiments of this specification.

Claims

1. An acoustic output device, comprising: case; A bone conduction vibrator, used for generating bone conduction sound waves and transmitting them to the cochlea through the shell to generate sound; An air conduction vibrator, used for generating air conduction sound waves, which are transmitted to the ear through the sound conduction holes on the shell; A processing module is used to provide a first audio signal and a second audio signal to the bone conduction vibrator and the air conduction vibrator respectively, the first audio signal and the second audio signal have a crossover point, the first audio signal and the second audio signal respectively include components with frequencies above and below the crossover point, wherein the crossover point is not lower than 600 Hz.

2. The acoustic output device according to claim 1, wherein: The crossover frequency point is not less than 1500 Hz.

3. The acoustic output device according to claim 1, wherein: The shell includes two sound guide holes, and the sound radiated to the far field through the two sound guide holes presents directivity, and the directivity is manifested as a difference of not less than 3dB between the sound pressure level in the direction of the line connecting the two sound guide holes and the sound pressure level in at least one other direction.

4. The acoustic output device according to claim 3, wherein: The difference in sound amplitudes emitted by the two sound guide holes is less than 6 dB, and the phase difference is 150°-210°.

5. The acoustic output device according to claim 4, wherein: The difference in acoustic loads of the two sound guide holes is less than 0.

15.

6. The acoustic output device according to claim 4, wherein: The crossover frequency point is not higher than 4000 Hz.

7. The acoustic output device according to claim 1, wherein: The processing module obtains the first audio signal and the second audio signal by performing high-pass filtering and low-pass filtering on the electrical signal containing sound information.

8. The acoustic output device according to claim 1, wherein: The bone conduction vibrator comprises a first magnetic circuit, a vibrating sheet and a first coil. The air conduction vibrator comprises a vibrating membrane, a second magnetic circuit and a second coil. Wherein, the angle between the first vibration direction of the vibration plate in the first magnetic circuit and the second vibration direction of the vibration membrane in the second magnetic circuit is in the range of 80°-100°.

9. The acoustic output device according to claim 8, wherein: The center of mass of the bone conduction vibrator and the center of mass of the air conduction vibrator are spaced apart in the first vibration direction.

10. The acoustic output device according to claim 8, wherein The bone conduction vibrator comprises two vibration plates located on both sides of the first magnetic circuit and symmetrically arranged, and the symmetry axes of the two vibration plates and the central axis of the air conduction vibrator are spaced apart in the first vibration direction.

11. The acoustic output device according to claim 8, wherein: The second magnetic circuit of the air conduction vibrator is located on the side of the diaphragm away from the bone conduction vibrator.

12. The acoustic output device according to claim 11, wherein The shell includes a first sound guide hole and a second sound guide hole, wherein the first sound guide hole is located on the side wall of the shell opposite to the bottom wall of the second magnetic circuit away from the diaphragm, and the second sound guide hole is connected to the front cavity where the diaphragm is located away from the second magnetic circuit.

13. The acoustic output device according to claim 12, comprising: An ear hook assembly is connected to the shell, wherein the second sound guide hole is arranged on a side wall of the shell away from the ear hook assembly along an extension direction of the ear hook assembly.

14. The acoustic output device according to claim 13, wherein: The vibration plate includes a long axis direction perpendicular to the first vibration direction, and in the long axis direction, a distance between the lowest point of the bone conduction vibrator and the lowest point of the outer opening of the second sound guide hole is not less than 1.0 mm.

15. The acoustic output device according to claim 13, wherein: The curvature radius of a corner formed between a first side wall of the bone conduction vibrator close to the second sound guide hole and a second side wall close to the diaphragm is greater than 1.0 mm.

16. The acoustic output device of claim 12, wherein: The front cavity includes an air flow channel connected to the second sound guide hole, and the minimum cross-sectional area of ​​the air flow channel is not less than 5.3 mm 2 .

17. The acoustic output device of claim 13, further comprising: A microphone, wherein the shell is provided with a microphone hole corresponding to the microphone, and the microphone hole and the second sound guide hole are covered by the same steel mesh.

18. The acoustic output device of claim 17, wherein: In the wearing state, the microphone hole is closer to the ear hook assembly than the second sound guide hole.

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