Bone conduction speakers and earphones

Abstract

To provide a novel method to improve the sound quality of a bone conduction speaker or a bone conduction earphone that can reduce noise.SOLUTION: A bone conduction speaker 300 includes a drive device that generates a driving force, a panel 301 that is conductively connected to the drive device and all or a portion of which is in contact with a user's body to make the sound conductive, and a first conduction component 303 mechanically connected to the drive device and the panel 301 so as to conduct driving force from the drive device to the panel 301. A portion of the first conduction component 303 is a flange and another portion of the first conduction component 303 is a connecting rod.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] [CROSS REFERENCE TO RELATED APPLICATIONS] This disclosure claims priority to Chinese Patent Application No. 201810623408.2, filed on June 15, 2018, the contents of which are incorporated herein by reference.

[0002] The present disclosure relates generally to a method for improving sound quality of a speaker, and more specifically, a bone conduction speaker or earphone. [Background technology]

[0003] Generally, people can hear sounds because sound vibrations are transmitted through the air to the eardrum through the ear canal. The vibrations formed by the eardrum can drive the human auditory nerve to make the sound vibrations perceive. When the bone conduction speaker is working, the sound vibrations are transmitted through the human skin, subcutaneous tissue, and bone to the human auditory nerve, so that people can hear sounds. Summary of the Invention

[0004] One embodiment of the present disclosure provides a bone conduction speaker. The bone conduction speaker may include a driver and a panel. The driver may generate a driving force located in a straight line. The panel may be communicably connected to the driver. The panel may conduct sound. An area where the panel interacts with a user's body may have a normal. The normal may not be parallel to the straight line.

[0005] In some embodiments, the line may have a positive direction pointing out of the bone conduction speaker through the panel, the normal may have a positive direction pointing out of the bone conduction speaker, and the angle in the positive direction between the two lines may be an acute angle.

[0006] In some embodiments, the driver may include a coil and a magnetic system. The axis of the coil and the axis of the magnetic system may not be parallel to the normal. The axis may be perpendicular to at least one of the radial plane of the coil and the radial plane of the magnetic system.

[0007] In some embodiments, the bone conduction speaker may further include a housing, which may be connected to the panel via a connection medium, or the housing and the panel may be integrally formed.

[0008] In some embodiments, the coil may be connected to at least one of the panel and the housing via a first transmission path, and the magnetic system may be connected to at least one of the panel and the housing via a second transmission path.

[0009] In some embodiments, the first transmission path may include a connection part, and the second transmission path may include a vibration transmission sheet. The stiffness of the connection part may be higher than the stiffness of the vibration transmission sheet.

[0010] In some embodiments, the stiffness of a component on the first transmission path or the second transmission path may be positively correlated with the elastic modulus and thickness of the component and negatively correlated with the surface area of ​​the component.

[0011] In some embodiments, stiffeners may be provided on the connecting pieces.

[0012] In some embodiments, the reinforcement may be a facade or a support rod.

[0013] In some embodiments, the connection piece may be a hollow cylinder, one end surface of which may be connected to one end surface of the coil, and the other end surface of which may be connected to at least one of the panel and the housing.

[0014] In some embodiments, the connection components may be a group of connecting rods. One end of each connecting rod may be connected to one end face of the coil, and the other end of each connecting rod may be connected to at least one of the panel and the housing. Each connecting rod may be circumferentially disposed around the coil.

[0015] In some embodiments, the driving force may have components in at least one of the first and third quadrants of an xoy-plane coordinate system. The origin o of the xoy-plane coordinate system may be located on the contact surface of the bone conduction speaker with the user's body. The x-axis may be parallel to the coronal axis of the human. The y-axis may be parallel to the sagittal axis of the human. The positive direction of the x-axis may be toward the outside of the user's body. The positive direction of the y-axis may be toward the front of the human body.

[0016] In some embodiments, the number of drivers may be at least 2. The line on which the resultant force of the driving forces generated by each driver lies may not be parallel to the normal line.

[0017] In some embodiments, the line along which the first driving force generated by the first driving device lies may be parallel to the normal, and the line along which the second driving force generated by the second driving device lies may be perpendicular to the normal.

[0018] In some embodiments, the area of ​​the panel is 20 mm 2 ~1000mm 2 It may be in the range.

[0019] In some embodiments, the side length of the panel may range from 5 mm to 40 mm, or from 18 mm to 25 mm, or from 11 to 18 mm.

[0020] In some embodiments, an angle may be formed between the normal and the line on which the driving force is located. The angle may be between 5° and 80°, or between 15° and 70°, or between 25° and 50°, or between 25° and 40°, or between 28° and 35°, or between 27° and 32°, or between 30° and 35°, or between 25° and 60°, or between 28° and 50°, or between 30° and 39°, or between 31° and 38°, or between 32° and 37°, or between 33° and 36°, or between 33° and 35.8°, or between 33.5° and 35°.

[0021] In some embodiments, the angle between the line on which the driving force is located and the normal may be 26°±0.2, 27°±0.2, 28°±0.2, 29°±0.2, 30°±0.2, 31°±0.2, 32°±0.2, 33°±0.2, 34°±0.2, 34.2°±0.2, 35°±0.2, 35.8°±0.2, 36°±0.2, 37°±0.2, or 38°±0.2.

[0022] In some embodiments, the area where the panel interacts with the user's body may be flat.

[0023] In some embodiments, the area where the panel interacts with the user's body may be quasi-planar. The normal of the area may be the average normal of the area. The average normal may be:

number

number

[0024] In some embodiments, the predetermined threshold may be less than 10 degrees.

[0025] Another embodiment of the present disclosure provides another bone conduction speaker. The bone conduction speaker may include a panel and a driver. The panel may be communicatively connected to the driver. The panel may conduct sound. An area where the panel interacts with a user's body may have a normal. An axis of the driver may not be parallel to the normal. The driver may include a coil and a magnetic system. The axis of the driver may be perpendicular to a radial plane of the coil and / or a radial plane of the magnetic system.

[0026] In some embodiments, the bone conduction speaker may further include a housing, which may be connected to the panel via a connection medium, or the housing and the panel may be integrally formed.

[0027] In some embodiments, the coil may be connected to the panel and / or housing via a connecting piece.

[0028] In some embodiments, stiffeners may be provided on the connecting pieces.

[0029] In some embodiments, the reinforcement may be a facade or a support rod.

[0030] In some embodiments, one side of the connecting piece may be shorter than the other side such that the axis of the coil is not parallel to the normal.

[0031] In some embodiments, the connection piece may be a hollow cylinder, one end surface of which may be connected to one end surface of the coil and the other end surface of which may be connected to the panel and / or the housing.

[0032] In some embodiments, the connection components may be a group of connecting rods. One end of each connecting rod may be connected to one end face of the coil and the other end of each connecting rod may be connected to the panel and / or the housing. Each connecting rod may be arranged circumferentially around the coil.

[0033] In some embodiments, the area where the panel interacts with the user's body may be flat.

[0034] In some embodiments, the area where the panel interacts with the user's body may be quasi-planar. The normal of the area may be the average normal of the area. The average normal may be:

number

number

[0035] In some embodiments, the predetermined threshold may be less than 10 degrees.

[0036] In some embodiments, the area of ​​the panel is 20 mm 2 ~1000mm 2 It may be in the range.

[0037] In some embodiments, the side length of the panel may range from 5 mm to 40 mm, or from 18 mm to 25 mm, or from 11 to 18 mm.

[0038] In some embodiments, the axis of the driver may have a positive direction pointing out of the bone conduction speaker through the panel, the normal may have a positive direction pointing out of the bone conduction speaker, and the angle in the positive direction between the two lines may be an acute angle.

[0039] In some embodiments, the angle between the line on which the driving force is located and the normal may be between 5° and 80°, or between 15° and 70°, or between 25° and 50°, or between 25° and 40°, or between 28° and 35°, or between 27° and 32°, or between 30° and 35°, or between 25° and 60°, or between 28° and 50°, or between 30° and 39°, or between 31° and 38°, or between 32° and 37°, or between 33° and 36°, or between 33° and 35.8°, or between 33.5° and 35°.

[0040] In some embodiments, the angle between the line on which the driving force is located and the normal may be 26°±0.2, 27°±0.2, 28°±0.2, 29°±0.2, 30°±0.2, 31°±0.2, 32°±0.2, 33°±0.2, 34°±0.2, 34.2°±0.2, 35°±0.2, 35.8°±0.2, 36°±0.2, 37°±0.2, or 38°±0.2.

[0041] Another embodiment of the present disclosure provides another bone conduction speaker. The bone conduction speaker may include a panel and at least two drivers. The panel may be communicatively connected to each of the two drivers. The panel may conduct sound. An area where the panel interacts with the user's body may have a normal. An axis of the first driver may be parallel to the normal and an axis of the second driver may be perpendicular to the normal. The drivers may include a coil and a magnetic system. An axis of the driver may be perpendicular to a radial plane of the coil and / or a radial plane of the magnetic system.

[0042] In some embodiments, the area where the panel interacts with the user's body may be flat.

[0043] In some embodiments, the area where the panel interacts with the user's body may be quasi-planar. The normal of the area may be the average normal of the area. The average normal may be:

number

number

[0044] In some embodiments, the predetermined threshold may be less than 10 degrees.

[0045] Another embodiment of the present disclosure provides a bone conduction earphone, which may include a bone conduction speaker according to any one of the preceding claims.

[0046] Another embodiment of the present disclosure provides a method of installing a bone conduction speaker. The method may include communicatively connecting a panel to a driver. The driver may be located in a straight line. The panel may conduct sound. An area where the panel interacts with a user's body may have a normal. The method also includes installing a relative position of the driver and the panel such that the straight line is not parallel to the normal.

[0047] In some embodiments, the method may include establishing a relative position of the driver and the panel such that the driving force has a component in at least one of a first quadrant and a third quadrant of an xoy-plane coordinate system. An origin o of the xoy-plane coordinate system may be located on a contact surface of the bone conduction speaker with the user's body. The x-axis may be parallel to a coronal axis of the human. The y-axis may be parallel to a sagittal axis of the human. The positive direction of the x-axis may be a direction toward the outside of the user's body. The positive direction of the y-axis may be a direction toward the front of the human body.

[0048] In some embodiments, the number of drivers may be at least two, and the method may include positioning each driver relative to the panel such that a line on which a resultant force of the driving forces generated by each driver is located is not parallel to the normal.

[0049] In some embodiments, the area where the panel interacts with the user's body may be flat.

[0050] In some embodiments, the area where the panel interacts with the user's body may be quasi-planar. The normal of the area may be the average normal of the area. The average normal may be:

number

number

[0051] In some embodiments, the predetermined threshold may be less than 10 degrees.

[0052] The present disclosure will be further described according to implementation embodiments, which will be described in detail with reference to the drawings, which are non-limiting implementation embodiments, in which similar reference numbers indicate similar structures in at least two figures of the drawings. [Brief description of the drawings]

[0053] [Figure 1] 1A-1C are schematic diagrams illustrating application scenarios and structures of exemplary bone conduction speakers according to some embodiments of the present disclosure. [Diagram 2] 1A-1C are schematic diagrams illustrating exemplary angular orientations according to some embodiments of the present disclosure. [Diagram 3] FIG. 1 is a schematic diagram illustrating the structure of an exemplary bone conduction speaker that acts on human skin and bones in accordance with some embodiments of the present disclosure. [Figure 4] 1 is a schematic diagram illustrating an angular relative displacement relationship of an exemplary bone conduction speaker according to some embodiments of the present disclosure. [Diagram 5]FIG. 2 is a schematic diagram illustrating a frequency response curve of an exemplary bone conduction speaker according to some embodiments of the present disclosure. [Figure 6] 1A-1C are schematic diagrams illustrating the low frequency portion of a frequency response curve of an exemplary bone conduction speaker at different angles θ according to some embodiments of the present disclosure. [Figure 7] FIG. 1 is a schematic diagram illustrating the high frequency portion of the frequency response curve of an exemplary bone conduction speaker with different panel and housing materials according to some embodiments of the present disclosure. [Figure 8] 1 is a schematic diagram showing an axial cross-sectional structure of an exemplary bone conduction speaker according to a first embodiment of the present disclosure. FIG. [Figure 9A] 1 is a schematic diagram showing an axial cross-sectional structure of an exemplary bone conduction speaker according to a second embodiment of the present disclosure. FIG. [Figure 9B] FIG. 11 is a schematic diagram showing an exploded structure of an exemplary bone conduction speaker according to a second embodiment of the present disclosure. [Figure 9C] FIG. 9C is a schematic diagram illustrating a longitudinal cross-sectional structure of the exemplary bone conduction speaker in FIG. 9B according to some embodiments of the present disclosure. [Figure 9D] 1 is a schematic diagram illustrating the structure of a bracket in an exemplary bone conduction speaker according to some embodiments of the present disclosure. [Figure 9E] 1 is a schematic diagram illustrating the structure of a bracket in an exemplary bone conduction speaker according to some embodiments of the present disclosure. [Figure 10] 11 is a schematic diagram showing an axial cross-sectional structure of an exemplary bone conduction speaker according to embodiment 3 of the present disclosure. FIG. [Figure 11] 11 is a schematic diagram showing an axial cross-sectional structure of an exemplary bone conduction speaker according to embodiment 4 of the present disclosure. FIG. [Figure 12] 11 is a schematic diagram showing an axial cross-sectional structure of an exemplary bone conduction speaker according to embodiment 5 of the present disclosure. FIG. [Figure 13] 11 is a schematic diagram showing an axial cross-sectional structure of an exemplary bone conduction speaker according to embodiment 6 of the present disclosure. FIG. [Figure 14] 11 is a schematic diagram showing an axial cross-sectional structure of an exemplary bone conduction speaker according to embodiment 7 of the present disclosure. FIG. [Figure 15] 11 is a schematic diagram showing an axial cross-sectional structure of an exemplary bone conduction speaker according to embodiment 8 of the present disclosure. FIG. [Figure 16] 13 is a schematic diagram showing an axial cross-sectional structure of an exemplary bone conduction speaker according to embodiment 9 of the present disclosure. [Figure 17] 1 is a flow chart illustrating a method of installing a bone conduction speaker according to some embodiments of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0054] In order to describe the technical solutions related to the embodiments of the present disclosure, a brief introduction of the drawings referred to in the description of the embodiments is provided below. Obviously, the drawings described below are only some examples or embodiments of the present disclosure. Those skilled in the art can apply the present disclosure to other similar scenarios according to these drawings without further creative efforts.

[0055] As used in this disclosure and the appended claims, the singular forms "a," "an," and "the" include plural referents unless the content clearly dictates otherwise. It is further understood that, as used in this disclosure, the terms "comprise," "include," "comprises," and / or "comprising" identify the presence of stated steps and elements, but do not preclude the presence or addition of one or more other steps and elements. The term "based on" means "based at least in part on." The term "one embodiment" means "at least one embodiment." The term "another embodiment" means "at least one other embodiment." The term "A and / or B" means "at least one of A and B," in other words, "A only, B only, or both A and B." Relevant definitions of other terms are provided in the following description.

[0056] Hereinafter, without loss of generality, the description of "bone conduction speaker" or "bone conduction earphone" will be used in describing bone conduction related technology in this disclosure. This description is only one form of bone conduction application. Those skilled in the art can also replace "speaker" or "earphone" with other similar words such as "player" and "hearing aid". In fact, various implementations of the present disclosure can be easily applied to other non-speaker type hearing instruments. For example, after understanding the basic principle of the bone conduction speaker, those skilled in the art can make various modifications and changes to the form and details of the specific method and steps of implementing the bone conduction speaker without departing from this principle. In particular, the ambient sound pick-up and processing function can be added to the bone conduction speaker to enable the speaker to realize the function of a hearing aid. For example, the microphone may pick up the ambient sound of the user / wearer and transmit the processed sound (or generated electrical signal) to the bone conduction speaker part under a certain algorithm. That is, the bone conduction speaker may be modified to include a function of picking up ambient sound and realize the function of a bone conduction hearing aid by transmitting the processed sound after a certain signal processing to the user / wearer through the bone conduction speaker part. By way of example only, the algorithms described herein may include noise cancellation, automatic gain control, acoustic feedback suppression, wide dynamic range compression, active environmental awareness, active noise avoidance, directional processing, anti-tinnitus processing, multi-channel wide dynamic range compression, active feedback suppression, volume control, and the like, or any combination thereof.

[0057] Bone conduction speakers transmit sound through bones to the auditory system, allowing people to hear. In general, bone conduction speakers generate and transmit sound through the following steps: In step 1, the bone conduction speaker may obtain or generate a signal containing sound information, such as a current signal and / or a voltage signal containing acoustic information. In step 2, a driver of the bone conduction speaker, also called a transmission device, may generate vibrations based on the signal. In step 3, the transmission part may transmit the vibrations to a panel or housing of the speaker.

[0058] In step 1, the bone conduction speaker may obtain or generate a signal including sound information according to different methods. The sound information may refer to a video file or audio file having a specific data format, or may refer to data or files that can be converted into sound in a specific way. The signal including sound information may be retrieved from a storage unit of the bone conduction speaker itself, or may be retrieved from an information generating system, storage system, or transmission system other than the bone conduction speaker. The sound signal discussed here is not limited to an electrical signal, but may include other forms, such as optical signals, magnetic signals, mechanical signals, etc., that include sound information that can be processed to generate vibrations. The sound signal is not limited to one signal source, but may be retrieved from multiple signal sources. Each of the multiple signal sources may be related or unrelated to each other. The transmission or generation of the sound signal may be wired or wireless, and may be real-time or delayed. For example, the bone conduction speaker may receive an electrical signal including sound information via a wired or wireless connection, or may directly retrieve data from a storage medium to generate the sound signal. In some embodiments, a component with sound collection function may be added to the bone conduction hearing aid, and the surrounding sound signal may be received and processed to achieve the effect of reducing noise. The wired connection may include, but is not limited to, a metal cable, an optical cable, a metal and optical hybrid cable, etc. The metal and optical hybrid cable may include a coaxial cable, a communication cable, a flexible cable, a spiral cable, a non-metallic sheath cable, a metal sheath cable, a multi-core cable, a twisted pair cable, a ribbon cable, a shielded cable, a telecommunication cable, a pair cable, a two-core parallel wiring, or a twisted pair.

[0059] The above embodiment is only for convenience of explanation. The wired connection medium may also be other types, such as other electrical or optical signal transmission carriers. The wireless connection may include, but is not limited to, wireless communication, free space optical communication, voice communication, or electromagnetic induction. The wireless communication may include, but is not limited to, IEEE 302.11 series standards, IEEE 302.15 series standards (e.g., Bluetooth technology, ZigBee technology, etc.), first generation mobile communication technology, second generation mobile communication technology (e.g., FDMA, TDMA, SDMA, CDMA, SSMA), general packet radio service technology, third generation mobile communication technology (e.g., CDMA2000, WCDMA, TD-SCDMA, WiMAX), fourth generation mobile communication technology (e.g., TD-LTE, FDD-LTE), satellite communication (e.g., GPS technology), near field communication (NFC), or other technologies operating in the ISM band (e.g., 2.4 GHz). The free space optical communication may include, but is not limited to, visible light, infrared signals, etc. The audio communication may include, but is not limited to, sound waves, ultrasonic signals, etc. The electromagnetic induction may include, but is not limited to, short-range wireless communication technology. The above embodiments are only for convenience of explanation. The wireless connection medium may also be other types, such as Z-wave technology, other charged civilian radio frequency bands, or military radio frequency bands. For example, as some exemplary scenarios of the technology, the bone conduction speaker may obtain a signal containing sound information from another device via Bluetooth technology, or directly obtain data from the storage unit of the bone conduction speaker to generate a sound signal.

[0060] Here, the storage device / storage unit refers to a storage device on a storage system, including direct-attached storage, network-attached storage, storage area network, etc. The storage device may include, but is not limited to, general-purpose types of storage devices, such as solid-state storage devices (e.g., solid-state disks, hybrid hard disks, etc.), mechanical hard disks, USB flash memory, memory sticks, memory cards (e.g., CF, SD, etc.), other drives (e.g., CD, DVD, HD DVD, Blu-ray, etc.), random access memory (RAM), read-only memory (ROM), etc. The RAM may include, but is not limited to, counter discharge tubes, selectrons, delay line memories, Williams tubes, dynamic random access memories (DRAM), static random access memories (SRAM), thyristor random access memories (T-RAM), zero capacitor random access memories (Z-RAM), etc. The ROM may include, but is not limited to, bubble memory, twister memory, film memory, plated wire memory, magnetic core memory, drum memory, CD-ROM, hard disk, tape, non-volatile random access memory (NVRAM), phase change memory, magnetoresistive random access memory, ferroelectric random access memory, non-volatile SRAM, flash memory, electrically erasable programmable read-only memory, erasable programmable read-only memory, programmable read-only memory, mask ROM, floating gate random access memory, nano random access memory, racetrack memory, resistive memory, programmable metallization unit, etc. The above storage devices / storage units are a list of some examples. The storage devices / storage units may use storage devices that are not limited to the above.

[0061] FIG. 1 is a schematic diagram illustrating an application scenario and structure of an exemplary bone conduction speaker according to some embodiments of the present disclosure. As shown in FIG. 1, the bone conduction speaker may include a driving device 101, a transmission part 102, a panel 103, a housing 104, etc. The driving device 101 may transmit a vibration signal to the panel 103 and / or the housing 104 via the transmission part 102, thereby causing the panel 103 or the housing 104 to contact human skin to transmit sound to the human body. In some embodiments, the bone 103 and / or the housing 104 of the bone conduction speaker may transmit sound to the human body by contacting human skin at the tragus. In some embodiments, the panel 103 and / or the housing 104 may also contact human skin behind the pinna.

[0062] A bone conduction speaker may convert a signal containing sound information into vibrations to generate sound. The generation of vibrations may involve the conversion of energy. A bone conduction speaker may use a specific driver to convert a signal into mechanical vibrations. The conversion process may involve the coexistence and conversion of several different types of energy. For example, an electrical signal may be directly converted into mechanical vibrations via a conversion device to generate sound. As another example, an optical signal may contain sound information, and the driver may implement a process to convert the optical signal into a vibration signal, or may first convert the optical signal into an electrical signal and then convert the electrical signal into a vibration signal. Other types of energy that can coexist and be converted during the operation of the driver may include thermal energy, magnetic field energy, and the like. The energy conversion methods of the driver may include, but are not limited to, moving coil, electrostatic, piezoelectric, moving iron, pneumatic, electromagnetic, and the like. The frequency response range and sound quality of a bone conduction speaker may be affected by different conversion methods and the performance of various physical parts in the driver. For example, in a dynamic coil type transducer, a wound cylindrical coil may be mechanically connected to a vibration transmission sheet, and a signal current in a magnetic field may drive the coil to drive the vibration transmission sheet to generate sound. In addition, the material expansion and contraction of the vibration transmission sheet, the deformation of the folds, the size, shape, and fixing method of the folds, and the magnetic density of the permanent magnets may all have a significant effect on the final sound quality of the bone conduction speaker. As yet another example, the vibration transmission sheet may have a mirror symmetric structure, a central symmetric structure, or an asymmetric structure. By providing a discontinuous porous structure on the vibration transmission sheet, the displacement of the vibration transmission sheet may be made larger, thereby making the bone conduction speaker more sensitive and improving the vibration and sound output. As another example, the vibration transmission sheet may have a torus structure, and multiple struts may be arranged in a torus radiating toward the center.

[0063] Obviously, after understanding the basic principle of the conversion method and the specific device that can affect the sound quality of the bone conduction speaker, a person skilled in the art may make appropriate selection, combination, modification or change of the above-mentioned influencing factors to obtain the ideal sound quality without deviating from this principle. For example, a high-density permanent magnet and a more ideal vibration plate material or design can be used to achieve better sound quality. The term "sound quality" as used herein may be understood to reflect the quality of sound and refers to the fidelity of the sound after processing, transmission, or other processes. Sound quality is primarily described by three components: loudness, tone, and timbre. Loudness refers to the subjective perception of sound intensity by the human ear and may be proportional to the logarithm of the sound intensity. The higher the logarithm of the sound intensity, the louder the sound. Loudness may also be related to the frequency and waveform of the sound. Tone, also called pitch, refers to the subjective perception of the frequency of sound wave vibrations in the human ear. Tone may be primarily determined by the fundamental frequency of the sound. The higher the fundamental frequency, the higher the tone. Tone may also be related to the intensity of the sound. Timbre refers to the subjective perception of the characteristics of the sound in the human ear. Timbre may be primarily determined by the spectral structure of the sound and may also be related to factors such as the loudness, duration, build-up process, or decay process of the sound. The spectral structure of the sound may be described by the fundamental frequency, the count of harmonic frequencies, the distribution of harmonic frequencies, magnitude, and phase relationship. Different spectral structures may have different timbres. Even if two sounds have the same fundamental frequency and loudness, if the two sounds have different harmonic structures, they may also have different timbres.

[0064] 1, according to the bone conduction speaker illustrated by some embodiments of the present disclosure, the driving force generated by the driving device may be located on a straight line B (i.e., the vibration direction of the driving force). The straight line B and a normal line A of the panel 103 may form an angle θ. That is, the line B is not parallel to the line A.

[0065] The panel may have an area that contacts or is adjacent to a user's body, such as human skin. It should be understood that if the panel is covered with another material (e.g., a soft material such as silicone) to increase the user's wearing comfort, the panel and the user's body may be adjacent to each other instead of directly contacting each other. In some embodiments, when the bone conduction speaker is worn on the user's body, all areas of the panel may contact or be adjacent to the user's body. In some embodiments, when the bone conduction speaker is worn on the user's body, a portion of the panel may contact or be adjacent to the user's body. In some embodiments, the area of ​​the panel used to contact or be adjacent to the user's body may occupy 50% or more of the panel area, and more preferably, 60% or more of the panel area. In general, the area of ​​the panel where the panel contacts or is adjacent to the user's body may be flat or curved.

[0066] In some embodiments, if the area of ​​the panel that contacts or is adjacent to the user's body is flat, the normal may meet the general definition of a normal, in some embodiments, if the area of ​​the panel that contacts or is adjacent to the user's body is curved, the normal may be the average normal of that area.

[0067] The average normal may be defined as follows:

number

[0068] Additionally, the curved surface may be a quasi-plane that is close to a plane, i.e., a plane where the angle between the normal of any point in at least 50% of the plane and the average normal is less than a predetermined threshold. In some embodiments, the threshold may be less than 10°. In some embodiments, the threshold may even be less than 5°.

[0069] In some embodiments, the line B on which the driving force is located and the normal A' of the area on the panel 103 that is in contact with or adjacent to the user's body may have an angle θ. The value of the angle θ may range from 0° to 180°, and may even be in the range of 0° to 180°, but may not be equal to 90°. In some embodiments, if the line B has a positive direction pointing out of the bone conduction speaker, and the normal A of the panel 103 (or the normal A' of the area on the panel 103 that is in contact with or adjacent to the user's body) also has a positive direction pointing out of the bone conduction speaker, the angle θ between the line A or A' and the line B in their positive directions may be an acute angle, i.e., 0°<θ<90°.

[0070] FIG. 2 is a schematic diagram showing an example angular direction according to some embodiments of the present disclosure. As shown in FIG. 2, in some embodiments, the driving force generated by the driving device may have components in the first and / or third quadrants of an xoy plane coordinate system. The xoy plane coordinate system is a reference coordinate system. The origin o may be located at the contact surface between the human body and the panel and / or the housing after the bone conduction speaker is worn on the human body. The x-axis may be parallel to the human coronal axis, and the y-axis may be parallel to the human sagittal axis. The positive direction of the x-axis may be toward the outside of the human body, and the positive direction of the y-axis may be toward the front of the human body. The quadrants should be understood as four regions divided by a horizontal axis (i.e., the x-axis) and a vertical axis (i.e., the y-axis) in a plane rectangular coordinate system. Each region can be called a quadrant. Each quadrant may be centered on the origin, and the x-axis and the y-axis are dividing lines. The upper right region (region bounded by the positive semi-axis of the x-axis and the positive semi-axis of the y-axis) can be called the first quadrant. The upper left region (region bounded by the negative semi-axis of the x-axis and the positive semi-axis of the y-axis) can be called the second quadrant. The lower left region (region bounded by the negative semi-axis of the x-axis and the negative semi-axis of the y-axis) can be called the third quadrant. The lower right region (region bounded by the positive semi-axis of the x-axis and the negative semi-axis of the y-axis) can be called the fourth quadrant. A point on the coordinate axis does not belong to any quadrant. It should be understood that the driving force described here may be located directly in the first quadrant and / or the third quadrant of the xoy plane coordinate system. The driving force may also be directed in other directions, the projection or component in the first quadrant and / or the third quadrant of the xoy plane coordinate system may be non-zero, and the projection or component in the z-axis direction may or may not be zero. The z-axis may be perpendicular to the xoy plane and may pass through the origin o. In some embodiments, the minimum angle θ between the line along which the driving force lies and the normal to the area on the panel that contacts or is adjacent to the user's body may be any acute angle.For example, the angle θ may be in a preferred range of 5° to 80°, a more preferred range of 15° to 70°, a more preferred range of 25° to 60°, a more preferred range of 25° to 50°, a more preferred range of 28° to 50°, a more preferred range of 30° to 39°, a more preferred range of 31° to 38°, a more preferred range of 32° to 37°, a more preferred range of 33° to 36°, a more preferred range of 33° to 35.8°, or a more preferred range of 33.5° to 35°. Specifically, the angle θ may be 26°, 27°, 28°, 29°, 30°, 31°, 32°, 33°, 34°, 34.2°, 35°, 35.8°, 36°, 37°, or 38°, etc. The error may be controlled to within 0.2 degrees. It should be noted that the description of the direction of the driving force should not be understood as a limitation of the driving force in this disclosure. In some other embodiments, the driving force may also have components in the second and fourth quadrants of the xoy plane coordinate system, may be located on the y-axis, etc.

[0071] FIG. 3 is a schematic diagram showing the structure of an exemplary bone conduction speaker acting on human skin and bone according to some embodiments of the present disclosure. The bone conduction speaker may receive, pick up, or generate a signal containing sound information, and convert the sound information into sonic vibrations via a driver. The vibrations may be transmitted to the human skin 320 in contact with a panel or housing through a transmission component, and the vibrations may be further transmitted to the human skeleton 310 so that the user hears the sound. Without loss of generality, the subject of the above auditory system and sensory organs may be a human, or an animal having an auditory system. It should be noted that the following description of the human use of the bone conduction speaker does not limit the usage scenario of the bone conduction speaker. Similar descriptions may also be applied to other animals.

[0072] As shown in FIG. 3, the bone conduction speaker may include a driver (also referred to as a transducer in other embodiments), a transmission component 303, a panel 301, and a housing 302.

[0073] The vibrations of the panel 301 may be transmitted through tissue and bone to the auditory nerve so that a person can hear the sound. The panel 301 may be in direct contact with the human skin or may be in contact with the human skin through a vibration transmitting layer made of a specific material. The area where the panel 301 contacts the human body may be near the tragus, mastoid process, behind the ear, or in other locations.

[0074] The physical properties of the panel, such as mass, size, shape, stiffness, vibration damping, etc., may all affect the vibration efficiency of the panel. One skilled in the art may select a panel formed of an appropriate material according to actual needs, or may use different molds to inject the panel into different shapes. For example, the shape of the panel may be rectangular, circular, or elliptical. As another example, the shape of the panel may be a shape obtained by cutting the edge of a rectangular, circular, or elliptical shape (such as, but not limited to, symmetrically cutting a circle to obtain a shape resembling an ellipse or oval shape). More preferably, the panel may be hollow. By way of example only, the area size of the panel may be set as needed. In some embodiments, the area size of the panel may be 20 mm or less. 2 ~1000mm 2 Specifically, the side length of the panel may be in the range of 5 mm to 40 mm, or 18 mm to 25 mm, or 11 to 18 mm. For example, the panel may be rectangular with a length of 22 mm and a width of 14 mm. As another example, the panel may be oval with a major axis of 25 mm and a minor axis of 15 mm.

[0075] Panel materials referred to herein may include, but are not limited to, steel, alloys, plastics, and single or composite materials. Steel may include, but are not limited to, stainless steel, carbon steel, and the like. Alloys may include, but are not limited to, aluminum alloys, chromium-molybdenum steel, rhenium alloys, magnesium alloys, titanium alloys, magnesium-lithium alloys, nickel alloys, and the like. Plastics may include, but are not limited to, acrylonitrile butadiene styrene (ABS), polystyrene (PS), high impact polystyrene (HIPS), polypropylene (PP), polyethylene terephthalate (PET), polyester (PES), polycarbonate (PC), polyamide (PA), polyvinyl chloride (PVC), polyethylene, blown nylon, and the like. Single or composite materials may include, but are not limited to, glass fiber, carbon fiber, boron fiber, graphite fiber, graphene fiber, silicon carbide fiber, aramid fiber, or other reinforcement. The single or composite materials may also include composites of other organic and / or inorganic materials such as glass fiber reinforced unsaturated polyester, various types of glass steels in an epoxy or phenolic resin matrix, etc.

[0076] In some other embodiments, the outside of the panel of the bone conduction speaker may be wrapped with a vibration transmission layer in contact with the skin. The vibration system consisting of the panel and the vibration transmission layer may transmit the generated sound wave vibration to the human body tissue. The vibration transmission layer may include multiple layers. The vibration transmission layer may be formed of one or more materials, and the materials of the different vibration transmission layers may be the same or different. The multiple vibration transmission layers may be overlapped in the vertical direction of the panel, placed in the horizontal direction of the panel, or overlapped at an angle to the panel. The angle between each layer and the panel may be the same or different, or any combination thereof. The vibration transmission layer may be composed of a material with specific adsorption, flexibility, and chemical properties, such as plastic (which may include, but is not limited to, high molecular weight polyethylene, blown nylon, engineering plastics, etc.), rubber, or other single or composite materials that can achieve the same performance.

[0077] In some embodiments, when the bone conduction speaker is worn on the user's body, all the areas of the panel may contact or be adjacent to the user's body. In some embodiments, when the bone conduction speaker is worn on the user's body, a part of the panel may contact or be adjacent to the user's body. In some embodiments, the area of ​​the panel used to contact or be adjacent to the user's body may occupy 50% or more of the panel area, more preferably 60% or more of the panel area. In general, the user's skin is relatively flat. If the area of ​​the panel that contacts the skin is placed on a plane or quasi-plane without large variations, the area of ​​the panel that contacts the skin will be larger and the sound volume will be larger. For example, the panel may have a composite structure with a flat surface in the center and an arc chamfer on the edge. Thus, the panel may have a curved surface to fully contact the human skin and ensure compatibility with different people.

[0078] In some embodiments, the panel 301 may cooperate with the housing 302 to form a sealed or semi-sealed cavity (e.g., a hole in the panel or housing) for housing the driving device. Specifically, the panel 301 and the housing 302 may be integrally formed, i.e., the panel and the housing may be constructed of the same material, and there is no boundary between the two in structure. The panel 301 may also be mechanically connected to the housing 302 by snapping, riveting, hot melt, or welding. In some other embodiments, the panel 301 and the housing 302 may be mechanically connected through a connection medium. The connection medium may include adhesives such as polyurethane, polystyrene, polyacrylate, ethylene-vinyl acetate copolymer, shellac, butyl rubber, and the like. The connection medium may also include connection parts having a specific structure, such as vibration transmission sheets, connection rods, and the like. The rigidity of the housing, the rigidity of the panel, and the rigidity of the connection between the housing and the panel may all affect the frequency response of the speaker. In some embodiments, both the housing and the panel may be formed of materials with higher rigidity, but the rigidity of the connection medium between the housing and the panel is relatively small. When the driver vibrates, the panel and the housing may vibrate asynchronously. In some other embodiments, both the housing and the panel may be formed of a material with higher stiffness, and the stiffness of the connection medium between the housing and the panel may also be greater, so that the overall stiffness of the vibration system may be higher, and the resonating part may contain more high frequency components. In some embodiments, the stiffness of the panel and the housing may be increased by adjusting the stiffness of the panel and the housing, and the peaks and valleys of the high frequency region may be adjusted to a higher frequency band region. A more detailed description of the relationship between the stiffness of the parts and the sound quality may be found elsewhere in this disclosure (see, for example, FIG. 7 and its description).

[0079] In some embodiments, the housing may have greater rigidity and lighter weight, and may mechanically vibrate as a whole. The housing may ensure the consistency of vibration, and may form mutually offset sound leakage, ensuring good sound quality and high volume. In some embodiments, the housing may or may not have holes. For example, holes in the housing may adjust the sound leakage of a bone conduction speaker.

[0080] Stiffness may be understood as the ability of a material or structure to resist elastic deformation when subjected to a force, and may be related to the elastic modulus of the material, the shape, the structure, or the installation method of the part. For example, the stiffness of a part is positively related to the elastic modulus and thickness of the part, and negatively related to the surface area of ​​the part. In some embodiments, the part may be a panel, a housing, a transmission part, etc. Specifically, the stiffness of a sheet-like part such as a panel may be expressed by the following formula:

number

number

[0081] In some embodiments, the actuator may be located in an enclosed or semi-enclosed space formed by the panel and the housing (e.g., having a hole in the panel or the housing). In some other embodiments, the actuator may be located in an enclosed or semi-enclosed space formed by the housing, and the panel is provided independently of the housing. More description of the separate installation of the panel and the housing may be found elsewhere in this disclosure (e.g., see FIG. 15 and its description). The actuator may convert the electrical signal into vibrations of different frequencies and amplitudes. The operating modes of the actuator may include, but are not limited to, moving coil, moving iron, piezoelectric ceramic, or other operating methods.

[0082] For the sake of example only, the following description may take the moving coil method as an example. In FIG. 3, the driving device may use the moving coil driving method and may include a coil 304 and a magnetic system 307.

[0083] The magnetic system 307 may include a first magnetic component 3071, a first magnetic conductive component 3072, and a second magnetic conductive component 3073. A magnetic component as described in this disclosure refers to a component that may generate a magnetic field, such as a magnet. A magnetic component may have a magnetization direction, and the magnetization direction refers to the direction of the magnetic field within the magnetic component. The first magnetic component 3071 may include one or more magnets. In some embodiments, the magnets may include metal alloy magnets, ferrites, and the like. The metal alloy magnets may include neodymium magnets, samarium cobalt, aluminum nickel cobalt, iron chromium cobalt, aluminum iron boron, iron carbon aluminum, and the like, or any combination thereof. The ferrites may include barium ferrite, steel ferrite, manganese ferrite, lithium manganese ferrite, and the like, or any combination thereof.

[0084] The magnetic conductive parts may also be referred to as magnetic field concentrators or iron cores that may adjust the distribution of a magnetic field (e.g., the magnetic field generated by the first magnetic part 3071). In some embodiments, the bottom surface of the first magnetic conductive part 3072 may be mechanically connected to the top surface of the first magnetic part 3071. The second magnetic conductive part 3073 may have a concave structure that may include a bottom wall and a side wall. The inside of the bottom wall of the second magnetic conductive part 3073 may be mechanically connected to the first magnetic part 3071, and the side wall may surround the first magnetic part 3071 and form a magnetic gap with the first magnetic part 3071. The mechanical connections between the first magnetic conductive part 3072, the second magnetic conductive part 3073, and the first magnetic part 3071 may include a bonded connection, a locking connection, a welded connection, a riveted connection, a bolted connection, or the like, or any combination thereof.

[0085] The magnetic conductive parts may include elements made of soft magnetic materials. In some embodiments, exemplary soft magnetic materials may include metal materials, metal alloy materials, metal oxide materials, amorphous metal materials, and the like. For example, the soft magnetic materials may include iron, iron-silicon based alloys, iron-aluminum based alloys, nickel-iron based alloys, iron-cobalt based alloys, low carbon steel, silicon steel, silicon steel, ferrites, and the like. In some embodiments, the magnets may be manufactured by, for example, casting, plastic processing, cutting, powder metallurgy, and the like, or any combination thereof. Casting may include sand casting, investment casting, pressure casting, centrifugal casting, and the like. Plastic processing may include rolling, casting, forging, stamping, extrusion, drawing, and the like, or any combination thereof. Cutting may include turning, milling, planning, grinding, and the like. In some embodiments, the magnetic conductive parts may be manufactured by 3D printing techniques, computer numerically controlled machine tools, and the like.

[0086] It should be understood that the description of the structure of the driver should not be construed as a limitation of the present disclosure. In some embodiments, the magnetic system may include multiple magnetic components that may be stacked together from top to bottom. Additional magnetic conductive components may be installed between adjacent magnetic components, and other magnetic conductive components may be installed on the top surface of the upper magnetic component. The magnetic components may be components that generate a magnetic field. The magnetic conductive components may adjust the distribution of the magnetic field. The structure of the magnetic system installed according to a specific magnetic field distribution requirement may be used for the bone conduction speaker and is not limited to the present disclosure.

[0087] The coil 304 may be disposed in the magnetic gap between the first magnetic part 3071 and the second magnetic conductive part 3073. After energization, the coil 304 located in the magnetic gap may be driven to oscillate by an Ampere force (e.g., a driving force). The magnetic system 307 may generate vibrations by the action of a counter force. The driving device may further include a transmission part 303 that transmits the vibrations of the coil 304 and / or the magnetic system 307 to the panel and / or the housing. The Ampere force may be a force that a conductor experiences in a magnetic field. The direction of the Ampere force may be perpendicular to a plane determined by the direction of the conductor and the magnetic field, and may be determined by the left-hand rule. When the current direction and the magnetic field direction change, the direction of the Ampere force may also change. In some embodiments, the magnetic field generated by the magnetic system is static. When the current direction changes, the direction of the driving force may switch along a straight line. The straight line may be considered as the line on which the driving force is located. The coil may generate vibrations due to a driving force, and the magnetic system may generate vibrations due to a repulsive force. Both vibrations are generally along the same line, but in opposite directions. The line can be considered as the line along which the vibrations are located, and may be the same (i.e. parallel) or the same as the line along which the driving force is located.

[0088] In some embodiments, vibrations of the coil may be transmitted to the panel and / or housing through a first transmission part, and vibrations of the magnetic system may be transmitted to the panel and / or housing through a second transmission part.

[0089] In some embodiments, after energization, the coil may generate vibrations under the influence of the Ampere force. The vibrations of the coil may be transmitted to the panel and / or the housing through the first transmission part, and the coil may interact with the magnetic system through the magnetic field. The reaction force received by the magnetic system may also generate vibrations, and the vibrations of the magnetic system may be transmitted to the panel and / or the housing through the second transmission part. In some embodiments, the transmission part may include a connecting rod, a connecting post, and / or a vibration transmission sheet. In some embodiments, the transmission part has a moderate elastic force that generates a damping effect in the vibration transmission process that may reduce the vibration energy transmitted to the housing, thereby effectively suppressing the sound leakage of the bone conduction speaker to the outside due to the housing vibration, avoiding the generation of abnormal sounds due to abnormal resonance sounds, and achieving the effect of improving sound quality. In addition, the position of the transmission part located in / on the housing may have different degrees of influence on the transmission efficiency of the vibration. In some embodiments, the transmission part may put the driving device in different states, such as suspended or supported. In addition, the vibration transmission sheet may be a thin plate-like one. The body of a particular vibration transmission sheet may be a ring structure, and multiple branches or multiple connecting pieces arranged radially toward the center may be provided on the ring body structure. The number of branches or connecting pieces may be two or more. A more detailed description of the transmission components may be found elsewhere in this disclosure (for example, see the specific embodiment section).

[0090] In some embodiments, the line on which the driving force is located may be collinear or parallel to the line on which the driver vibrates. For example, in a driver with the principle of a moving coil, the direction of the driving force may be the same as or opposite to the vibration direction of the coil and / or magnetic system. The panel may be flat or curved, or the panel may have some protrusions or grooves. In some embodiments, when the bone conduction speaker is worn on the user's body, the normal of the area on the panel that contacts or is adjacent to the user's body is not parallel to the line on which the driving force is located. In general, the area on the panel that contacts or is adjacent to the user's body may be relatively flat, more specifically, a plane or quasi-plane with little change in curvature. If the area on the panel that contacts or is adjacent to the user's body is a plane, the normal at any point on the panel may be the normal of the area. If the area on the panel that contacts or is adjacent to the user's body is not a plane, the normal of the area may be an average normal. More explanation of the average normal may be found elsewhere in this disclosure (see, for example, FIG. 1 and its description). In some embodiments, if the area on the panel that contacts or is adjacent to the user's body is not flat, the normal of the area may be determined as follows: A point in the area where the panel is in contact with the human skin may be selected, the tangent plane of the panel at the point may be determined, and then a line that passes through the point and is perpendicular to the tangent plane may be determined. The straight line may be the normal of the panel. According to certain embodiments of the present disclosure, the line on which the driving force is located (or the line on which the driver vibrates) may have an angle θ (0°<θ<180°) with the normal of the area. In some embodiments, the line on which the driving force is located may have a positive direction pointing out of the bone conduction speaker through the panel (or the surface of the panel and / or the housing in contact with the human skin), and the normal of the particular panel (or the surface of the panel and / or the housing in contact with the human skin) may have a positive direction pointing out of the bone conduction speaker, and the angle in the positive direction between the two lines may be an acute angle.

[0091] In some embodiments, the bone conduction speaker 300 may include a panel 301, a housing 302, a first transmission part 303, a coil 304, a vibration transmission sheet 305, a second transmission part 306, and a magnetic system 307. The vibrations of the coil 304 and the magnetic system 307 may be transmitted to the panel 301 and / or the housing 302 via different paths. For example, the vibrations of the coil 304 may be transmitted to the panel 301 and / or the housing 302 via a first transmission path, and the vibrations of the magnetic system 307 may be transmitted to the panel 301 and / or the housing 302 via a second transmission path. The first transmission path may include the first transmission part 303, and the second transmission path may include the second transmission part 306, the vibration transmission sheet 305, and the first transmission part 303. Specifically, a part of the first transmission part 303 may be a flanged structure. The flange may be a ring shape conforming to the structure of the coil 304 and may be mechanically connected to one end surface of the coil 304. The other part of the first transmission part 303 may be a connecting rod that may be mechanically connected to the panel and / or the housing. The coil 304 may be fully or partially sleeved in the magnetic gap of the magnetic system 307. In the second transmission path, the second transmission part 306 may be mechanically connected to the magnetic system 307 and the vibration transmission sheet 305. The edge of the vibration transmission sheet 305 may be fixed to the flange of the first transmission part 303. The center of the vibration transmission sheet 305 may be mechanically connected to one end of the second transmission part 306. The edge of the vibration transmission sheet 305 may be mechanically connected to the inside of the flange of the first transmission part 303, and the connection may include a snap-fit ​​connection, a hot press connection, a rivet connection, a bonded connection, an injection molding connection, etc. It should be noted that the first and second transmission paths may also have other structures, and this embodiment should not be construed as a limitation of the transmission components, a more detailed description of which may be found elsewhere in this disclosure.

[0092] In some embodiments, both the coil 304 and the magnetic system 307 may have a ring structure. In some embodiments, the coil 304 and the magnetic system 307 may have mutually parallel axes, and the axes of the coil 304 and the magnetic system 307 may be perpendicular to the radial plane of the coil 304 and / or the radial plane of the magnetic system 307. In some embodiments, the coil 304 and the magnetic system 307 may have the same central axis. The central axis of the coil 304 may be perpendicular to the radial plane of the coil 304 and pass through the geometric center of the coil 304. The central axis of the magnetic system 307 may be perpendicular to the radial plane of the magnetic system 307 and pass through the geometric center of the magnetic system 307. The axis of the coil 304 or the magnetic system 307 and the normal to the panel 301 may have an angle θ as described above.

[0093] In this embodiment, after energization, the coil 304 may generate an ampere force and vibration in the magnetic field generated by the magnetic system 307, and transmit the vibration of the coil 304 to the panel 301 through the first transmission part 303. The vibration generated by the reaction force received by the magnetic system 307 may be transmitted to the panel 301 through the second transmission part 306, the vibration transmission sheet 305, and the first transmission part 303. The vibration of the coil 304 and the vibration of the magnetic system 307 may be transmitted to the skin and bones of the human body through the panel 301, so that people can hear the sound. In short, the vibration generated by the coil 304 and the vibration generated by the magnetic system 307 may form a composite vibration that may be transmitted to the panel 301. The composite vibration may be transmitted to the skin and bones of the human body through the panel 301, so that people can hear the bone conduction sound.

[0094] By way of example only, the relationship between the driving force F and the skin deformation S will be described with reference to Figure 3. When the driving force generated by the actuator is parallel to the normal of the panel 302 (i.e., when the angle θ is zero), the relationship between the driving force and the overall skin deformation may be expressed as:

number

[0095] When the driving force of the driver is perpendicular to the normal of the area on the panel in contact with or adjacent to the user's body (i.e., the angle θ is 90 degrees), the relationship between the perpendicular driving force and the overall skin deformation may be expressed as follows:

number

number

[0096] When the driving force of the driving device is not parallel to the normal of the area on the panel that contacts or is adjacent to the user's body, the horizontal and vertical driving forces may be expressed as equations (7) and (8) below.

number

number

number

[0097] For a detailed explanation of the relationship between the angle θ and the overall deformation of the skin when the Poisson's ratio of the skin is 0.4, see FIG.

[0098] 4 is a schematic diagram illustrating an angular relative displacement relationship of an exemplary bone conduction speaker according to some embodiments of the present disclosure. As shown in FIG. 4, the relationship between the angle θ and the overall skin deformation may be that the larger the angle θ, the larger the relative displacement and the larger the overall skin deformation S. The larger the angle θ, the smaller the relative displacement and the vertical skin deformation S.

number

number

[0099] The volume of the bone conduction earphone in the low frequency part may be positively related to the deformation S of the whole skin. The larger S, the larger the volume of the low frequency part of the bone conduction. The volume of the bone conduction earphone in the high frequency part is related to the vertical skin deformation.

number

number

[0100] If the Poisson's ratio of the skin is 0.4, the skin deformation perpendicular to the angle θ between the angle θ and the total skin deformation S

number

number

[0101] From equation (8) and the curves in Fig. 4, as the angle θ increases, the rate at which the deformation S of the entire skin increases is proportional to the vertical skin deformation

number

number

[0102] FIG. 5 is a schematic diagram showing a frequency response curve of an exemplary bone conduction speaker according to some embodiments of the present disclosure. As shown in FIG. 5, the horizontal axis indicates the vibration frequency, and the vertical axis indicates the vibration strength of the bone conduction earphone. In some embodiments, in the frequency range of 500-6000 Hz, the flatter the frequency response curve, the better the sound quality of the bone conduction earphone is considered to be. The structure, part design, and material properties of the bone conduction earphone may affect the frequency response curve. In general, low frequency refers to sounds higher than 500 Hz, intermediate frequency refers to sounds in the range of 500 Hz-4000 Hz, and high frequency refers to sounds greater than 4000 Hz. As shown in FIG. 5, the frequency response curve of the bone conduction earphone may have two resonance peaks (510 and 520) in the low frequency range, a first high frequency valley 530 in the high frequency range, a first high frequency peak 540, and a second high frequency peak 550. The two resonance peaks (510, 520) in the low frequency range may be generated by the combined action of the vibration transmission sheet and the earphone fixing part. The first high frequency valley 530 and the first high frequency peak 540 may be generated by the deformation of the housing side at high frequencies, and the second high frequency peak 550 may be generated by the deformation of the shell panel at high frequencies.

[0103] The location of the different resonance peaks and high frequency peaks / valleys may be related to the stiffness of the corresponding parts. This stiffness is generally referred to as the degree of flexibility and stiffness, and is the ability of a material or structure to resist elastic deformation when subjected to a force. Stiffness is related to the Young's modulus of the material itself and the structure dimensions. The greater the stiffness, the less the structure will deform when subjected to a force. As mentioned above, the frequency response of 500-6000 Hz is particularly important for bone conduction earphones. In this frequency range, no sharp peaks and valleys are expected. The flatter the frequency response curve, the better the sound quality of the earphones. In some embodiments, the peaks and valleys in the high frequency range may be adjusted to higher frequencies by adjusting the stiffness of the shell panel and the shell back panel.

[0104] FIG. 6 is a schematic diagram showing the low-frequency portion of the frequency response curve of an exemplary bone conduction speaker at different angles θ according to some embodiments of the present disclosure. As shown in FIG. 6, the panel may contact the skin and transmit vibration to the skin. In this process, the skin may also affect the vibration of the bone conduction speaker, thereby affecting the frequency response curve of the bone conduction speaker. From the above analysis, it can be seen that the larger the angle, the larger the overall deformation of the skin under the same driving force, which corresponds to a decrease in the elasticity of the skin relative to the panel when corresponding to the bone conduction speaker. Furthermore, it can be understood that the line on which the driving force of the driving device is located and the normal of the area on the panel that contacts or is adjacent to the user's body may form a certain angle θ. In particular, when the angle θ is increased, the resonance peak in the low-frequency range of the frequency response curve may be adjusted to the low-frequency range, so that the low-frequency band becomes deeper and the low-frequency portion becomes larger. Compared with other technical means of improving the low-frequency part of the sound, such as adding a vibration transmission sheet to a bone conduction speaker, setting the angle can effectively suppress the increase in vibration while increasing low-frequency energy, thereby relatively reducing the vibration sensation, thereby significantly improving the low-frequency sensitivity of the bone conduction speaker and improving the sound quality and human experience. Note that in some embodiments, the increase in the low-frequency range and low vibration may be expressed as the angle θ increases in the range of 0° to 90°, and the energy in the low-frequency range of the vibration or sound signal increases and the vibration sensation increases. However, since the increase in energy in the low-frequency range may be greater than the increase in vibration, the relative effect is relatively reduced.

[0105] From FIG. 6, we can see that when the angle is relatively large, the low-frequency resonance peak appears in a lower frequency range and the flat part of the frequency curvature is longer, thereby improving the sound quality of the earphone.

[0106] FIG. 7 is a schematic diagram showing the high frequency portion of the frequency response curve of an exemplary bone conduction speaker with different panel and housing materials according to some embodiments of the present disclosure. As shown in FIG. 7, when the panel and housing materials are hard, the frequency corresponding to the first and second high frequency peaks is higher. When the panel and housing materials are soft, the frequency corresponding to the first and second high frequency peaks is lower. When the panel and housing materials are hard, the frequency corresponding to the first high frequency valley is higher. When the panel and housing materials are soft, the frequency corresponding to the first high frequency valley is lower than when the panel and housing materials are hard. It can be seen that the rigid (harder) material of the panel and housing can increase the corresponding frequency value when the high frequency peak / valley appears. According to the description of FIG. 5, it is known that the frequency response of 1000-10000 Hz is particularly important for bone conduction earphones. In this frequency range, no sharp peaks and valleys are expected. The flatter the frequency response curve, the better the sound quality of the earphone. A stiffer (harder) material for the panels and housing in FIG. 7 may improve the sound quality of the earphone by lengthening the flat portion of the frequency curvature.

[0107] In some embodiments, the stiffness of different parts (e.g., housing, transmission parts, driving device, etc.) may be related to the Young's modulus of the material, thickness, size, etc. The relationship between the stiffness of the housing and the material of the housing is exemplified and described below. In some embodiments, the housing may include a shell panel, a shell back panel, and a housing side. The shell panel, the shell back panel, and the housing side may be made of the same material or different materials. For example, the shell back panel and the shell panel may be made of the same material, and the housing side may be made of another material. In some embodiments, under some conditions, the higher the Young's modulus of the housing material, the higher the stiffness of the housing. The peaks and valleys of the frequency response curve of the earphone may change to high frequencies, which helps to adjust the high frequency peaks and valleys to higher frequencies. In some embodiments, the Young's modulus of the housing material may be adjusted to adjust the peaks and valleys of the frequency response curve to higher frequencies. In some embodiments, a material with a specific Young's modulus may be used. The Young's modulus of the housing may be greater than 2000 MPa. Preferably, the Young's modulus of the housing may be greater than 4000 MPa. Preferably, the Young's modulus of the housing may be greater than 6000 MPa. Preferably, the Young's modulus of the housing may be greater than 8000 MPa. Preferably, the Young's modulus of the housing may be greater than 12000 MPa, more preferably, the Young's modulus of the housing may be greater than 15000 MPa. Even more preferably, the Young's modulus of the housing may be greater than 18000 MPa.

[0108] In some embodiments, by adjusting the rigidity of the housing, the high frequency peak-valley frequency in the frequency response curve of the bone conduction earphone may be 1000 Hz or more. Preferably, the high frequency peak-valley frequency may be 2000 Hz or more. Preferably, the high frequency peak-valley frequency may be 4000 Hz or more. Preferably, the high frequency peak-valley frequency may be 6000 Hz or more. More preferably, the high frequency peak-valley frequency may be 8000 Hz or more. More preferably, the high frequency peak-valley frequency may be 10000 Hz or more. More preferably, the high frequency peak-valley frequency may be 12000 Hz or more. Even more preferably, the high frequency peak-valley frequency may be 14000 Hz or more. Even more preferably, the high frequency peak-valley frequency may be 16000 Hz or more. Even more preferably, the high frequency peak-valley frequency may be 18000 Hz or more. Even more preferably, the high frequency peak-valley frequency may be 20000 Hz or more. In some embodiments, by adjusting the stiffness of the housing, the high frequency peak-valley frequency in the frequency response curve of the bone conduction earphone may be outside the hearing range of the human ear. In some embodiments, by adjusting the stiffness of the housing, the high frequency peak-valley frequency in the frequency response curve of the earphone may be within the hearing range of the human ear. In some embodiments, when there are multiple high frequency peaks / valleys, by adjusting the stiffness of the housing, one or more high frequency peak / valley frequencies in the frequency response curve of the bone conduction earphone may be outside the hearing range of the human ear, and the remaining one or more high frequency peak / valley frequencies may be within the hearing range of the human ear. For example, the second high frequency peak may be outside the hearing range of the human ear, whereby the first high frequency valley and the first high frequency peak may be within the hearing range of the human ear.

[0109] In some embodiments, improving the rigidity of the housing may be achieved by changing the connection mode of the shell panel, shell back panel, and housing side to ensure that the entire housing has a higher rigidity. In some embodiments, the shell panel, shell back panel, and housing side may be formed as a whole. In some embodiments, the shell back panel and housing side may be formed as a whole. The shell panel and the housing side may be directly fixed by adhesive, or may be fixed by snapping or welding. The adhesive may be a high viscosity and high hardness adhesive. In some embodiments, the shell panel and the housing side may be formed as a whole, and the shell back panel and the housing side may be directly fixed by adhesive, or may be fixed by snapping or welding. The adhesive may be a high viscosity and high hardness adhesive. In some embodiments, the shell panel, shell back panel, and housing side may be independent parts. The above three parts may be fixedly connected by adhesive, snapping, welding, etc., or any combination thereof. For example, the shell panel and the housing side may be connected by adhesive, and the shell back panel and the housing side may be connected by snapping or welding. As another example, the shell back panel and the housing side may be connected by an adhesive, and the shell panel and the housing side may be connected by snaps or welding.

[0110] In some embodiments, materials having different Young's moduli may be used and matched to improve the overall stiffness of the housing. In some embodiments, the shell panel, shell back panel, and housing side may be formed of one material. In some embodiments, the shell panel, shell back panel, and housing side may be formed of different materials, which may have the same or different Young's moduli. In some embodiments, the shell panel and shell back panel may be formed of the same material, and the housing side may be formed of another material. The Young's moduli of the two materials may be the same or different. For example, the Young's modulus of the material of the housing side may be greater than that of the shell panel and shell back panel, and the Young's modulus of the material of the housing side may be less than that of the shell panel and shell back panel. In some embodiments, the shell panel and housing side may be formed of the same material, and the shell back panel may be formed of another material. The Young's moduli of the two materials may be the same or different. For example, the Young's modulus of the material of the shell back panel may be greater than that of the shell panel and housing side, and the Young's modulus of the material of the shell back panel may be less than that of the shell panel and housing side. In some embodiments, the shell back panel and the housing side may be formed of the same material, and the shell panel may be formed of another material. The Young's modulus of the two materials may be the same or different. For example, the Young's modulus of the material of the shell panel may be greater than the Young's modulus of the shell back panel and the housing side, or the Young's modulus of the material of the shell panel may be less than the Young's modulus of the shell back panel and the housing side. In some embodiments, the materials of the shell panel, the shell back panel, and the housing side may all be different. The Young's modulus of the three materials may be the same or different, and may all be 2000 MPa or greater.

[0111] In some embodiments, by adjusting the rigidity of the vibration transmission sheet and the earphone fixing part, the two resonance peak frequencies in the low frequency range of the bone conduction earphone may both be less than 2000Hz. Preferably, the two resonance peak frequencies in the low frequency range of the bone conduction earphone may be less than 1000Hz. More preferably, the two resonance peak frequencies in the low frequency range of the bone conduction earphone may be less than 500Hz.

[0112] In some embodiments, by adjusting the rigidity of each component of the bone conduction earphone (e.g., the housing, the housing bracket, the vibration transmission sheet, or the earphone fixing component), the peaks and valleys in the high frequency range can be adjusted to higher frequencies and the low frequency resonance peaks can be adjusted to lower frequencies to ensure a frequency response curve platform in the range of 1000 Hz to 10,000 Hz, thereby improving the sound quality of the bone conduction earphone.

[0113] On the other hand, bone conduction earphones may cause sound leakage during vibration transmission. Sound leakage refers to the change in the amount of surrounding air caused by the vibration of the internal parts of the bone conduction earphones or the vibration of the housing, causing the surrounding air to form a compressed or sparse area and propagate around, resulting in sound being transmitted to the surrounding environment, so that people other than the wearer of the bone conduction earphones can hear the sound from the earphones. The present disclosure may provide a solution for reducing sound leakage of bone conduction earphones by changing the structure or rigidity of the housing.

[0114] In some embodiments, sound leakage of the bone conduction speaker may be further effectively reduced by a properly designed vibration generating part including a vibration transmission layer (not shown in the figure). Preferably, sound leakage may be reduced by providing holes on the surface of the vibration transmission layer. For example, the vibration transmission layer may be bonded to a panel, and the bonded area on the vibration transmission layer may be more convex than the non-bonded area on the vibration transmission layer. The cavity may be located under the non-bonded area. The non-bonded area of ​​the vibration transmission layer and the housing surface may each be provided with a sound introduction hole. Preferably, the non-bonded area having a part of the sound introduction hole may not contact the user. On the other hand, the sound introduction hole may effectively reduce the area of ​​the non-bonded area of ​​the vibration transmission layer, pass air inside and outside the vibration transmission layer, and reduce the difference in air pressure between the inside and outside, thereby reducing the vibration of the non-bonded area. On the other hand, the sound introduction hole may guide the sound waves formed by the internal air vibration of the housing to the outside of the housing, and offset the leaked sound waves formed by the vibration of the housing by pushing the air out of the housing, thereby reducing the amplitude of the leaked sound waves.

[0115] In some embodiments, the angle between the direction of the driving force generated by the driving device and the direction of the panel may not be unique. With reference to Figures 8-16, methods of installing the driving device and the panel are illustrated in terms of different embodiments.

[0116] EMBODIMENT 1 8 is a schematic diagram showing an axial cross-sectional structure of an exemplary bone conduction speaker according to the first embodiment of the present disclosure. As shown in FIG. 8, in some embodiments, the bone conduction speaker 800 may include a panel 801, a housing 802, a first transmission part 803, a coil 804, a vibration transmission sheet 805, and a magnetic system 806. The panel 801 and the housing 802 may form a sealed or semi-sealed cavity, and the driving device including the first transmission part 803, the coil 804, the vibration transmission sheet 805, and the magnetic system 806 may be located in the cavity.

[0117] In some embodiments, both the coil 804 and the magnetic system 806 may have a ring structure. In some embodiments, the coil 804 and the magnetic system 806 may have axes parallel to each other. The axis of the actuator refers to the axis of the coil 804 and / or the magnetic system 806. The axis of the actuator and the normal of the area on the panel that contacts or is adjacent to the user's body may form an angle θ (0°<θ<90°). Specifically, the axis of the actuator and the normal of the area on the panel that contacts or is adjacent to the user's body may form an angle θ. More explanation of the spatial relationship between the axis of the coil 804 or the magnetic system 806 and its normal may be found elsewhere in this disclosure (see, for example, FIG. 3 and its description).

[0118] In some embodiments, a portion of the first transmission part 803 may have a ring structure that matches the structure of the coil 804. The ring structure may be mechanically connected to one end face of the coil 804, and another portion of the first transmission part 803 may be a connecting rod that is mechanically connected to the panel and / or the housing. All or a portion of the coil 804 may be sleeved in the magnetic gap of the magnetic system 806. All or a portion of the coil 804 may be sleeved in the annular groove of the magnetic system 806. In some embodiments, the annular end face of the magnetic system 806 may be mechanically connected to the outer edge of the vibration transmission sheet 805. The first transmission part 803 may pass through the middle region of the vibration transmission sheet 805 and be fixedly connected to the vibration transmission sheet 805.

[0119] After energization, the coil 804 generates an ampere force and vibration in the magnetic field generated by the magnetic system 806, and the vibration of the coil 804 may be transmitted to the panel 801 through the first transmission part 803. The vibration generated by the reaction force received by the magnetic system 806 may be directly transmitted to the first transmission part 803 through the vibration transmission sheet 805, and further transmitted to the panel 801. The vibration of the coil 804 and the vibration of the magnetic system 806 may be transmitted to the skin and bones of the human body through the panel 801, so that people can hear the sound. It may be understood that since the vibration transmission sheet is directly connected to the magnetic system 806 and the first transmission part 803, the vibration generated by the magnetic system 806 may be directly transmitted to the panel through the first transmission part 803. Furthermore, the vibrations generated by the coil 804 and the vibrations generated by the magnetic system 806 may form a composite vibration that is transmitted to the panel 801, and the composite vibration may then be transmitted through the panel 801 to the skin and bones of the human body, thereby allowing people to hear bone-conducted sound.

[0120] EMBODIMENT 2 9A is a schematic diagram showing an axial cross-sectional structure of an exemplary bone conduction speaker according to embodiment 2 of the present disclosure. The bone conduction speaker 900a may include a panel 901, a housing 902, a first transmission part 903, a coil 904, a vibration transmission sheet 905, a second transmission part 906, and a magnetic system 907. The first transmission part 903 may be a hollow cylinder, and one end face of the first transmission part 903 may be mechanically connected to the panel 901, and the other end face of the first transmission part 903 may be mechanically connected to one end of the coil 904. All or a part of the coil 904 may be sleeved in an annular groove or magnetic gap of the magnetic system 907. It should be understood that both the coil 904 and the magnetic system 907 may have a ring structure. In some embodiments, the coil 904 and the magnetic system 907 may have axes parallel to each other. More explanation of the spatial relationship between the axis of the coil 904 or magnetic system 907 and the normal of the area on the panel that contacts or is adjacent to the user's body may be found elsewhere in this disclosure (see, for example, FIG. 3 and its description). The center or near-center area of ​​the magnetic system 907 is mechanically connected to one end of the second transmission component 906. The other end of the second transmission part 906 may be mechanically connected to a central region or a region near the center of the vibration transmission sheet 905. The outer edge of the vibration transmission sheet 905 may be mechanically connected to the inside of the flange of the first transmission part 903. The connection method may include, but is not limited to, clamp connection, hot press connection, bond connection, injection molding connection, etc.

[0121] In this embodiment, after energization, the coil 904 may generate an ampere force and vibration in the magnetic field generated by the magnetic system 907, and transmit the vibration of the coil 904 to the panel 901 through the first transmission part 903. The vibration generated by the reaction force received by the magnetic system 907 may be transmitted to the panel 901 through the second transmission part 906, the vibration transmission sheet 905, and the first transmission part 903. The vibration of the coil 904 and the vibration of the magnetic system 907 may be transmitted to the skin and bones of the human body through the panel 901, so that people can hear the sound. In short, the vibration generated by the coil 904 and the vibration generated by the magnetic system 907 may form a composite vibration that is transmitted to the panel 901, and then the composite vibration may be transmitted to the skin and bones of the human body through the panel 901, so that people can hear the bone conduction sound.

[0122] The embodiment shown in Fig. 9A may be different from the embodiment shown in Fig. 8. As shown in Fig. 9A, by changing the first transmission part from a connecting rod to a hollow cylinder structure, the combination of the first transmission part and the coil may be more sufficient and the structure may be more stable. At the same time, the frequency of the higher mode of the speaker (i.e., the vibrations of different points on the speaker do not match) may be increased, and the low-frequency resonance peak of the frequency response curve of the bone conduction speaker may be moved to a lower frequency, so that the flat area of ​​the frequency response curve may be widened and the sound quality of the speaker may be improved.

[0123] Fig. 9B is a schematic diagram showing an exploded structure of an exemplary bone conduction speaker according to embodiment 2 of the present disclosure. Fig. 9C is a schematic diagram showing a longitudinal cross-sectional structure of the exemplary bone conduction speaker in Fig. 9B according to some embodiments of the present disclosure. The structure of the bone conduction speaker shown in Fig. 9B and Fig. 9C may correspond to the structure shown in Fig. 9A.

[0124] As shown in FIG. 9B, the bone conduction speaker 900b may include a silicone part 910 attached to the vibration plate and surface, a bracket and vibration transmission sheet 911, a coil 912, a connection part 913, a bolt and nut assembly 914, an upper magnet 915, a magnetic conductive plate 916, a lower magnet 917, a magnetic conductive cover 918, a multifunction key PCB 919, a multifunction button silicone 920, a speaker shell 921, an ear hook multifunction button 922, and an ear hook 923. As shown in FIG. 9C, the silicone part 910 attached to the vibration plate and surface may further include a silicone 9101 and a vibration plate 9102 attached to the surface. The bracket and vibration transmission sheet 911 may further include a bracket 9111 and a vibration transmission sheet 9112. The bolt and nut assembly 914 may further include a bolt 9141 and a nut 9142. The vibration plate 9102 may be functionally equivalent to the panel described above, and the surface-mounted silicone 9101 may be equivalent to a soft material covering the panel. It may be understood that the surface-mounted silicone 9101 may not be a required part. In some embodiments, the surface-mounted silicone 9101 may be omitted. The bracket 9111 may correspond to the first transmission part described above. The connection part 913 may correspond to the second transmission part described above. The speaker shell 921 may be equivalent to the housing described above.

[0125] As shown in FIG. 9C, the silicone part 910 attached to the vibration plate and the surface may be combined with the speaker shell 921 to form a closed or semi-closed cavity for accommodating the magnetic system, the transmission parts, and other parts. The magnetic conductive cover 918 may have a concave structure, specifically including a bottom plate and a side wall. The upper magnet 915, the magnetic conductive plate 916, and the lower magnet 917 may be stacked from top to bottom on the bottom plate of the magnetic conductive cover 918. The upper magnet 915, the magnetic conductive plate 916, the lower magnet 917, and the magnetic conductive cover 918 may each be provided with a through hole and assembled together by a bolt and nut assembly 914 to form a magnetic system. A magnetic gap may be formed between the magnetic conductive cover 918 and the upper magnet 915, the magnetic conductive plate 916, and the lower magnet 917 provided on the bottom plate. The coil 912 may be partially or entirely disposed in the magnetic gap. As shown in FIG. 9D and FIG. 9E, the bracket 9111 may have a ring structure with a non-uniform thickness. Specifically, one side may be thicker than the other side. The size of one end surface of the bracket 9111 may correspond to the coil 912 and may be mechanically connected to one end surface of the coil 912, and the other end of the bracket 9111 may be adjacent to or mechanically connected to the silicone part 910 attached to the vibration plate and the surface. The structure of the bracket 9111, which is thicker on one side than the other side, may tilt the driving device with respect to the silicone part 910 attached to the vibration plate and the surface, thereby ensuring that the axis of the driving device (or the direction of the driving force) and the normal to the contact surface (the surface that contacts human skin) of the silicone part 910 attached to the surface have an angle θ. The connection part 913 may connect the upper magnet 915 of the magnetic system with the vibration transmission sheet 9112 and simultaneously perform the function of vibration transmission. The specific connection method may include, but is not limited to, a bolt connection, a bonded connection, a welded connection, and the like. The edges of the vibration transmission sheet 9112 may be snapped onto the inside of the bracket 9111. The bracket 9111 may also perform the function of transmitting the vibrations of the coil and the vibrations of the magnetic system to the silicone part 910 attached to the vibration plate and surface.The outer edge of the bracket may be snapped into a groove or limiting slot in the inner wall of the speaker shell 921 and secured within the cavity, allowing the bracket to provide transmission while also suspending and supporting the entire drive arrangement.

[0126] 9D and 9E are schematic diagrams showing the structure of a bracket in an exemplary bone conduction speaker according to some embodiments of the present disclosure. As shown in FIG. 9D and 9E, by way of example only, the bracket 9111 may have an annular body 91111. The body may be an annular sheet structure, and an annular façade 91112 conforming to the shape of the body may be provided on the body. One side of the façade 91112 may be lower than the other side (e.g., the façade A side is lower than the façade B side). The transition between the high side and the low side may be performed via connecting parts C and D with a continuous change in height, or via connecting parts with a discontinuous change in height. For example, the connecting parts C and D are configured with a step-like structure with a discontinuous change in height. It should be noted that the A side, the B side, the connecting part C, and the connecting part D may be considered as four different parts of the façade 91112, and may be integrally formed with each other without any obvious boundary in the structure. The A side, the B side, the connection part C, and the connection part D may also be assembled together by additional connection methods structurally independent of each other. Specific connection methods may include, but are not limited to, bonded connection, welded connection, hot melt connection, and the like. The bracket 9111 may be used to connect the coil to the silicone part 910 attached to the vibration plate and the surface to realize vibration transmission. Specifically, the lower end surface of the bracket body 91111 may be fixedly connected to the upper end surface of the coil, and the upper end surface of the façade 91112 may be adjacent to or mechanically connected to the silicone part 910 attached to the vibration plate and the surface (see FIG. 9C). In some embodiments, the distance between the silicone part 910 attached to the vibration plate and the surface and the driving device (e.g., the coil) may be relatively long, which may allow the height of the façade to be large. If the façade 91112 is thin, the strength is low and may be easily damaged, and if the façade 91112 is thick, it will affect the transmission and affect the sound quality. In some embodiments, some reinforcements 91113 may be provided on the outside or inside of the facade 91112, which may ensure the strength of the facade 91112 without affecting the sound quality.In some embodiments, the stiffener 91113 may be a smaller façade perpendicular to the façade 91112, one end of which may be mechanically connected to the body 91111 and the other end of which may be mechanically connected to the façade 91112. The connection method may include, but is not limited to, bonded connection, welded connection, thermoplastic molding, integral molding, etc. In some embodiments, the stiffener 91113 may also be a short strut. The strut may be supported diagonally between the façade and the body. One end of the strut may be mechanically connected to the body 91111 and the other end of the strut may be mechanically connected to the façade 91112. The connection method may include, but is not limited to, bonded connection, welded connection, thermoplastic molding, integral molding, etc. EMBODIMENT 3

[0127] FIG. 10 is a schematic diagram showing an axial cross-sectional structure of an exemplary bone conduction speaker according to the third embodiment of the present disclosure. Compared with the bone conduction speaker 900, the difference of the bone conduction speaker 1000 may be the installation position and length of the first transmission part 1003. The first transmission part 1003 may include a plurality of connecting rods or connecting posts. One end of a part of the connecting rods may be mechanically connected to the panel 1001. One end of the other part of the connecting rods may be mechanically connected to the first side 1002 of the housing, and the other end of each connecting rod may be mechanically connected to one end face of the coil 1004. That is, each connecting rod may be distributed between the coil and the panel and / or the housing along the coil 1004, and the connecting rods may be distributed at equal intervals or at different intervals. As a variation of this embodiment, the first transmission part 1003 may also be designed as a hollow cylinder like the first transmission part 903, and its cross section may be adapted to the size and shape of the coil. A first end surface of the first transmission part 1003 may be mechanically connected to one end of the coil, a portion of a second end surface of the first transmission part 1003 may be mechanically connected to the panel 1001, and another portion may be mechanically connected to the housing 1002.

[0128] Compared to the bone conduction speaker 900, the length of the first transmission part 1003 of the bone conduction speaker 1000 may be shorter, which may further increase the frequency at which the speaker produces higher modes (i.e., vibrations at different points on the speaker do not match).

[0129] EMBODIMENT 4 FIG. 11 is a schematic diagram showing an axial cross-sectional structure of an exemplary bone conduction speaker according to embodiment 4 of the present disclosure. As shown in FIG. 11, the bone conduction speaker 1100 may include a driving device 1101, a transmission part 1102, a panel 1103, and a housing 1105. The transmission part 1102 may include structures such as a vibration transmission sheet, a connecting rod, and a connecting post. The transmission part 1102 may be mechanically connected to the driving device 1101 and the panel 1103 as a transmission path for transmitting the vibration or driving force generated by the driving device 1101 to the panel 1103. In some embodiments, the distance between the panel and the driving device is relatively long, so the length of the transmission path needs to be increased. In addition, the length of the transmission part needs to be increased. For example, the length of the connecting rod or the connecting post needs to be increased. If the structure of the transmission part is thin, its strength will be relatively low and it may be damaged by long-term vibration. If the structure of the transmission part is installed thicker and thicker to solve this problem, it may also affect the transmission of vibration and affect the sound quality. In some embodiments, additional reinforcements 1104 may be provided on the surface of the transmission piece to increase the strength of the transmission piece and have a small impact on the structure of the transmission piece. In some embodiments, the reinforcements 1104 may include facades, ridges, struts, etc. The connection method between the reinforcements 1104 and the transmission piece 1102 may include, but is not limited to, bonded connections, welded connections, thermoplastic molding, integral molding, etc. In some embodiments, multiple reinforcements 1104 may be provided on the surface of the transmission piece. In the case of annular transmission pieces, the reinforcements may be distributed at equal or unequal intervals around the circumference of the transmission piece. More description of the reinforcements may be found elsewhere in this disclosure (see, for example, Figures 9D and 9E and their descriptions).

[0130] Compared to other embodiments, the bone conduction speaker 1100 shown in Fig. 11 may have reinforcement 1104 added to the transmission part. While increasing the strength of the transmission part, the frequency at which the speaker produces higher modes (i.e., vibrations at different points on the speaker do not match) may be increased, which may result in better sound.

[0131] EMBODIMENT 5 12 is a schematic diagram showing an axial cross-sectional structure of an exemplary bone conduction speaker according to embodiment 5 of the present disclosure. As shown in FIG. 12, in some embodiments, one end of a first transmission part 1203 of a bone conduction speaker 1200 may be mechanically connected to a bottom surface of a housing 1202, that is, the entire driving device may be fixed to the housing 1202 at an angle with respect to the panel.

[0132] Specifically, both the housing 1202 and the panel 1201 may have great hardness and may be integrally formed or connected via a connecting medium with relatively high rigidity. After energization, the vibration generated by the coil 1204 and the vibration generated by the magnetic system 1207 may form a composite vibration that is transmitted to the housing 1202 and then to the panel 1201. The composite vibration may be transmitted to the skin and bones of the human body through the panel 1201, allowing people to hear bone conduction sound.

[0133] EMBODIMENT 6 FIG. 13 is a schematic diagram showing an axial cross-sectional structure of an exemplary bone conduction speaker according to embodiment 6 of the present disclosure. As shown in FIG. 13, in some embodiments, the bone conduction speaker 1300 may include a housing 1302, a panel 1301 provided independently of the housing, and a driving device. The driving device may include a first transmission part 1303, a coil 1304, a vibration transmission sheet 1305, a second transmission part 1306, and a magnetic system 1307. The housing 1302 may include a first housing 13021 and a third transmission part 13022. The first housing 13021 may be a rectangular parallelepiped having a cavity. In some embodiments, the first housing 13021 may be a closed cylinder, a sphere having a cavity, etc. The driving device may be located in the cavity, and the internal structure of the driving device may be any of the above embodiments.

[0134] The upper side of the first housing 13021 may be mechanically connected to the upper side of the panel 1301 via the third transmission part 13022, and the lower side of the first housing 13021 may be directly connected to the lower side of the panel 1301. The method of connecting the first housing 13021 and the panel 1301 may not be limited to the above method. For example, the lower side of the first housing 13021 may be mechanically connected to the lower side of the panel 1301 via the third transmission part 13022, and the upper side of the first housing 13021 may be directly connected to the upper side of the panel 1301. As another example, only the central region of the first housing 13021 may be mechanically connected to the panel via the third transmission part. The third transmission part may be a rod-shaped, plate-shaped, or hollow columnar structure.

[0135] In this embodiment, after energization, the coil 1304 may generate an ampere force and vibration in the magnetic field generated by the magnetic system 1307, and transmit the vibration of the coil 1304 to the first housing 13021 through the first transmission part 1303. The first housing 13021 may transmit the vibration to the panel 1301 through the third transmission part 13022 or directly. The vibration generated by the reaction force received by the magnetic system 1307 may be transmitted to the first housing 13021 through the connection between the second transmission part 1306 and the vibration transmission sheet 1305. The first housing 13021 may transmit the vibration to the panel 1301 through the third transmission part 13022 or directly. The vibration of the coil 1304 and the vibration of the magnetic system 1307 may be transmitted to the skin and bones of the human body through the panel 1301, allowing people to hear the sound. In short, the vibration generated by the coil 1304 and the vibration generated by the magnetic system 1307 form a composite vibration, which may be first transmitted to the first housing 13021 and then transmitted to the panel 1301 directly or through the third transmission part 13022. The composite vibration may be transmitted to the skin and bones of the human body through the panel 1301, so that people can hear the bone-conducted sound.

[0136] EMBODIMENT 7 FIG. 14 is a schematic diagram showing an axial cross-sectional structure of an exemplary bone conduction speaker according to a seventh embodiment of the present disclosure. As shown in FIG. 14, the bone conduction speaker 1400 may have a first transmission path and a second transmission path that are independent of each other. Specifically, the first transmission path may include a first transmission part 1403. The transmission part on the second transmission path may include a vibration transmission sheet 1405 and a second transmission part 1406. The bone conduction speaker 1400 having the first transmission path and the second transmission path that are independent of each other may mean that there are no transmission parts common to the two transmission paths.

[0137] As shown in FIG. 14, the bone conduction speaker 1400 may include a panel 1401, a housing 1402, a first transmission part 1403, a coil 1404, a vibration transmission sheet 1405, a second transmission part 1406, and a magnetic system 1407. The panel 1401 and the housing 1402 may form a closed or semi-closed cavity, and the driver including the first transmission part 1403, the coil 1404, the vibration transmission sheet 1405, the second transmission part 1406, and the magnetic system 1407 may be located within the cavity. An axis of the driver and a normal to an area on the panel that contacts or is adjacent to the user's body may form an angle θ (0°<θ<90°). The bottom surface of the magnetic system 1407 may be mechanically connected to the vibration transmission sheet 1405 via the second transmission part 1406, and the outer edge of the vibration transmission sheet 1405 may be mechanically connected to the housing 1402. For example, the outer edge of the vibration transmission sheet 1405 may be mechanically connected to the bottom of the housing 1402 or to the side of the housing 1402, or one portion may be mechanically connected to the bottom of the housing 1402 and the other portion may be mechanically connected to the side of the housing 1402.

[0138] In this embodiment, after energization, the coil 1404 generates an ampere force and vibration in the magnetic field generated by the magnetic system 1407, and the vibration of the coil 1404 may be transmitted to the panel 1401 through the first transmission part 1403. The vibration generated by the reaction force received by the magnetic system 1407 may be transmitted to the bottom and side of the housing 1402 through the second transmission part 1406 and the vibration plate 1405. The housing may transmit the vibration of the magnetic system 1407 to the panel 1401. Finally, the vibration of the coil 1404 and the vibration of the magnetic system 1407 may be transmitted to the skin and bones of the human body through the panel 1401, so that people can hear the sound. It may be understood that the magnetic system and the housing 1402 may be soft-connected because the vibration transmission sheet is directly connected to the housing 1402. The vibration generated by the magnetic system 1407 may be directly transmitted to the bottom of the housing 1402 and one side of the housing 1402. The vibration generated by the coil 1404 and the vibration generated by the magnetic system 1407 may form a composite vibration that is transmitted to the panel 1401. When the composite vibration is transmitted through the panel 1401 to the skin and bones of the human body, people can hear bone-conducted sound.

[0139] EMBODIMENT 8 FIG. 15 is a schematic diagram showing an axial cross-sectional structure of an exemplary bone conduction speaker according to embodiment 8 of the present disclosure. The bone conduction speaker 1500 shown in FIG. 15 may include a double vibration transmission sheet structure. The low frequency range of the vibration frequency response curve of the speaker may have an additional peak, which makes the low frequency response of the speaker more sensitive and improves the sound quality. Specifically, as shown in FIG. 15, the bone conduction speaker 1500 may include a panel 1501, a housing 1502, a first transmission part 1503, a coil 1504, a first vibration transmission sheet 1505, a second vibration transmission sheet 1506, a second transmission part 1507, and a magnetic system 1508. The connection method between the panel 1501, the first transmission part 1507, the first vibration transmission sheet 1505, the second transmission part 1507, and the magnetic system 1508 may be the same as that shown in FIG. 9. An edge of the second vibration transmission sheet 1506 may be mechanically connected to the open end surface of the housing 1502. The first transmission part 1503 may pass through a central region of the second vibration transmission sheet 1506 and be fixedly connected to the second vibration transmission sheet 1506. A central axial surface of the second vibration transmission sheet 1506 may be snapped into the solid cylinder of the first transmission part 1503.

[0140] The working principle of the bone conduction speaker 1500 in this embodiment may be as follows: After energization, the coil 1504 generates an ampere force and vibration in the magnetic field generated by the magnetic system 1508, and the vibration of the coil 1504 may be directly transmitted to the panel 1501 through the first transmission part 1503. The vibration generated by the reaction force received by the magnetic system 1508 may be transmitted to the panel 1501 through the second transmission part 1507 and the first vibration transmission sheet 1505. The vibration of the housing 1502 may be transmitted to the panel 1501 through the second vibration plate. Then, the vibration of the coil 1504 and the vibration of the magnetic system 1508 may be transmitted to the skin and bones of the human body through the panel 1501, so that people can hear the sound. It may be understood that the soft connection between the panel 1501 and the housing 1502 may be realized through the second vibration transmission sheet 1506. The vibrations generated by the coil 1504 and the vibrations generated by the magnetic system 1508 may form a composite vibration that is transmitted to the panel 1501 and the housing 1502. The composite vibration may then be transmitted through the panel 1501 to the skin and bones of the human body, allowing people to hear bone-conducted sound.

[0141] EMBODIMENT 9 FIG. 16 is a schematic diagram showing an axial cross-sectional structure of an exemplary bone conduction speaker according to embodiment 9 of the present disclosure. As shown in FIG. 16, in yet another embodiment, a bone conduction speaker 1600 may include a panel 1601, a housing 1602, and two drivers 1605 and 1606. The panel 1601 and the housing 1602 may form a closed or semi-closed cavity, and the two drivers 1605 and 1606 may be located in the cavity. The drivers in this embodiment may be the drivers in the previous embodiment of the present disclosure. The driver 1605 may be mechanically connected to the panel 1601 via a first transmission part 1603. The driver 1606 may be mechanically connected to a partition plate provided in the cavity via a second transmission part 1604. A certain angle may be formed between the driver 1605 and the driver 1606. In some embodiments, the driver 1606 may be directly connected to the panel or housing via a second transmission part 1604 bent at a right angle. Note that in some embodiments, the axis of the driver 1605 may not be parallel to the normal of the panel, and the axis of the driver 1606 may not be perpendicular to the normal of the panel. The position of the two drivers relative to the panel may be such that the straight line of the resulting direction of the driving forces generated by the two drivers and the normal of the area on the panel that contacts or is adjacent to the user's body may form an angle θ (0°<θ<90°). Furthermore, it may be understood that the number of drivers may also be three, four, or more. By adjusting the position of each driver in the cavity, the straight line of the resulting direction of the driving forces generated by each driver and the normal of the area on the panel that contacts or is adjacent to the user's body may form an angle θ (0°<θ<90°).

[0142] In this embodiment, the driving force of the driver 1605 may be parallel to the normal of the area on the panel that is in contact with or adjacent to the user's body. The driving force of the driver 1606 may be perpendicular to the normal of the area on the panel that is in contact with or adjacent to the user's body. By simultaneously vibrating the two drivers and transmitting the two types of vibration to the panel, and then transmitting the composite vibration to the skin and bones of the human body through the panel 1601, people can hear the bone conduction sound.

[0143] The present disclosure also provides a bone conduction earphone. In use, the earphone holder / earphone strap may fix the bone conduction speaker to a certain part of the user (e.g., the head) and provide a clamping force between the vibration unit and the user. The contact surface may be connected to a driver to keep in contact with the user and transmit sound to the user by vibration. Assuming that the bone conduction speaker is a symmetrical structure and the driving forces provided by the two drivers on both sides are the same in opposite directions, the center point of the earphone holder / earphone strap may be selected as the equivalent fixed end. If the bone conduction speaker can provide stereo sound, that is, if the magnitude of the instantaneous driving forces provided by the two conversion devices is different, or if the bone conduction speaker is an asymmetrical structure, other points or areas inside and outside the earphone rack / earphone strap may be selected as the equivalent fixed end. As used herein, the fixed end may be regarded as the equivalent end at which the position of the bone conduction speaker is relatively fixed in the process of generating vibration. The fixed end and the vibration unit may be connected through an earphone holder / earphone strap, and the transmission relationship may be related to the earphone holder / earphone strap and the clamping force provided by the earphone holder / earphone strap, and the clamping force may depend on the physical characteristics of the earphone holder / earphone strap. Preferably, changing the physical characteristics such as the clamping force provided by the earphone rack / earphone strap, the quality of the earphone rack / earphone strap, etc. may change the sound transmission efficiency of the bone conduction speaker, thereby affecting the frequency response of the system in a certain frequency range. For example, an earphone holder / earphone strap formed of a material with higher strength and an earphone holder / earphone strap formed of a material with lower strength may provide different clamping forces, or changing the structure of the earphone holder / earphone strap, such as adding an auxiliary device that provides an elastic force to the earphone holder / earphone strap, may change the clamping force, thereby affecting the sound transmission efficiency. When worn, a change in the size of the earphone holder / earphone strap may also affect the magnitude of the clamping force.The clamping force may increase with the distance between the vibrating units on either end of the earphone holder / earphone strap.

[0144] In order to obtain an earphone holder / earphone strap that meets a specific clamping force condition, a person skilled in the art may select materials with different stiffness and different elastic modulus to manufacture the earphone rack / earphone strap or adjust the size of the earphone rack / earphone strap. It should be noted that the clamping force of the earphone holder / earphone strap may not only affect the sound transmission efficiency but also affect the user's sound experience in the low frequency range. The clamping force described herein may be the pressure between the contact surface and the user. Preferably, the clamping force may be in the range of 0.1N to 5N. More preferably, the clamping force may be in the range of 0.2N to 4N. More preferably, the clamping force may be in the range of 0.2N to 3N. More preferably, the clamping force may be in the range of 0.2N to 1.5N, and more preferably, the clamping force may be in the range of 0.3N to 1.5N.

[0145] It should be noted that the above-mentioned embodiments of the bone conduction speaker may be merely examples, and the parts and structures described in these embodiments should not be construed as limitations of the present disclosure. The parts, shapes, structures, and connection methods in these embodiments may be combined. For example, the reinforcement in FIG. 11 may be applied to any of the embodiments shown in FIG. 9 to FIG. 16. The first transmission part 903 of the bone conduction speaker 900a in FIG. 9 may also be connected to the panel and housing at the same time as the first transmission part 1003 of the bone conduction speaker 1000, or may be connected to the rear of the housing like the bone conduction speaker 1200.

[0146] 17 is a flow chart illustrating a method for installing a bone conduction speaker according to some embodiments of the present disclosure. Method 1700 may be a step included in installing a bone conduction speaker according to certain embodiments of the present disclosure.

[0147] In 1710, the transmission of the panel and the driver may be connected. In some embodiments, the driver may be connected to the panel using a transmission part and a connection part, such as a vibration transmission sheet. In addition to the structural connection, the transmission part may also serve to transmit the vibration. Specifically, the driver may include a coil and a magnetic system. The vibration of the coil and the magnetic system may be transmitted to the panel and / or the housing through different paths. For example, the vibration of the coil may be transmitted to the panel and / or the housing through a first transmission path, and the vibration of the magnetic system may be transmitted to the panel and / or the housing through a second transmission path. The first transmission path may include a first transmission part. The second transmission path may include a second transmission part, a vibration transmission sheet, and the first transmission part. The first transmission part may be a connection post or a connection rod. The second transmission part may be a connection post or a connection rod.

[0148] In some embodiments, the bone conduction speaker may transmit vibrations generated by the driver to the panel by connecting the driver to the panel, and thereby further transmit the vibrations to the human body through the panel attached to the human body. The transmission connection between the panel and the driver effectively transmits the vibration signal generated by the driver, so that the human body may receive the signal. In some embodiments, the panel, the transmission part, and the driver are generally made of rigid materials and are rigidly connected to each other to improve the quality of the transmitted audio signal.

[0149] In 1720, the relative position of the driving device and the panel may be set so that the line on which the driving force generated by the driving device is located is not parallel to the normal line of the panel. Specifically, the relative position of the driving device and the panel may be set according to the various embodiments described above. The installation method adopted may include changing the structure of the transmission part. For example, the transmission part may be set in a structure with one side lower than the other side, thereby ensuring that the line on which the driving force is located is not parallel to the normal line of the panel. The installation method adopted may also include improving the structure of the panel or the housing to achieve a technical purpose. For example, a platform inclined relative to the panel may be set in the housing, and the driving device may be set on the platform. As another example, the driving device may be set horizontally in the housing, and the panel may be inclined to cover the housing. As long as the driving device can be inclined relative to the panel so that the line on which the driving force is located is not parallel to the normal line of the area on the panel that contacts or is adjacent to the user's body, any method may be applied to the present disclosure, and the present disclosure is not limited thereto.

[0150] It should be noted that there is no required sequence in the two steps of installing the bone conduction speaker. The order of the two steps may be reversed. In some embodiments, the two steps may not be completely separate processes, i.e., the two steps may be performed simultaneously. For example, when the driver is connected to the panel, the relative position of the two is adjusted.

[0151] Having thus described the basic concepts, it will be apparent to those skilled in the art who have read this detailed disclosure that the above detailed disclosure has been described by way of example only and is not limiting. Although not expressly stated herein, various changes, improvements, and modifications are contemplated and possible for those skilled in the art. These changes, improvements, and modifications are intended to be suggested by this disclosure and are within the spirit and scope of the exemplary embodiments of the present disclosure.

[0152] Furthermore, certain terms are used to describe embodiments of the present disclosure. For example, the terms "one embodiment," "embodiment," and / or "some embodiments" mean that a particular feature, structure, or characteristic described in connection with this embodiment is included in at least one embodiment of the present disclosure. Thus, it is emphasized and understood that two or more references to "an embodiment" or "one embodiment" or "alternative embodiments" in various parts of this specification do not necessarily all refer to the same embodiment. Furthermore, certain features, structures, or characteristics can be combined as appropriate in one or more embodiments of the present disclosure.

[0153] Moreover, as will be appreciated by those skilled in the art, aspects of the present disclosure may be illustrated and described herein in any of a number of patentable varieties or contexts, including any new and useful process, machine, manufacture, or composition of matter, or any new and useful improvements thereof. Accordingly, aspects of the present disclosure may be implemented in entirely hardware, entirely software (including firmware, resident software, microcode, etc.), or a combination of software and hardware implementations, which implementations may be generally collectively referred to herein as "units," "modules," or "systems." Additionally, aspects of the present disclosure may take the form of a computer program product embodied in one or more computer-readable medium(s) having computer-readable program code embodied therein.

[0154] Furthermore, unless expressly stated in the claims, the use of a described order, numbers, letters, or other designations of processing elements or sequences in this application is not intended to limit the order of the processes and methods of this application. While the above disclosure has been discussed through various examples of what are currently believed to be various useful embodiments of the present disclosure, it should be understood that such details are provided for illustrative purposes only, and that the appended claims are not limited to the disclosed embodiments, but rather are intended to encompass modifications and equivalent arrangements within the spirit and scope of the disclosed embodiments. For example, the implementation of the various components described above may be embodied in a hardware device, but may also be implemented as a software-only solution, for example, installed on an existing server or mobile device.

[0155] Similarly, in the foregoing description of embodiments of the present disclosure, it should be understood that various features are grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure to aid in understanding one or more of the various inventive embodiments. However, this method of disclosure should not be interpreted as reflecting an intention that the claimed subject matter requires more features than are expressly recited in each claim. Rather, an embodiment of the present invention has less than all features of a single foregoing disclosed embodiment.

[0156] In some embodiments, numbers expressing quantities or properties used to describe and claim certain embodiments of the present application should be understood to be modified in some instances by the terms "about", "approximately" or "substantially". For example, unless otherwise specified, "about", "approximately" or "substantially" can represent ±1%, ±5%, ±10%, or ±20% variation of the value they recite. Thus, in some embodiments, the numerical parameters set forth in the specification or appended claims are approximations that may vary depending on the desired properties sought to be obtained by a particular embodiment. In some embodiments, the numerical parameters should be construed in light of the number of reported significant digits and by applying ordinary rounding techniques. Notwithstanding that the numerical ranges and parameters set forth in the broad ranges of some embodiments of the present application are approximations, the numerical values ​​set forth in the specific examples are reported as precisely as possible.

[0157] Finally, it should be understood that the embodiments of the present application disclosed herein are illustrative of the principles of the embodiments of the present application. Other modifications that may be adopted may be within the scope of the present application. Thus, by way of example, alternative configurations of the embodiments of the present application may be utilized in accordance with the contents of this specification. Thus, the embodiments of the present application are not limited to those strictly shown and described. [Explanation of symbols]

[0158] 101 Drive unit 102 Transmission parts 103 Bone, Panel 104 Housing 300 Bone conduction speaker Panel 301 302 Panel, housing 303 First transmission part, transmission part 304 Coil 305 Vibration Transmission Sheet 306 Second transmission part 307 Magnetic Systems 310 Skeleton 320 skin 510 Resonance Peak 520 Resonance Peak 530 First High Frequency Valley 540 First high frequency peak 550 Second high frequency peak 800 Bone Conduction Speaker 801 Panel 802 Housing 803 First Transmission Part 804 Coil 805 Vibration Transmission Sheet 806 Magnetic Systems 900 Bone conduction speaker 901 Panel 902 Housing 903 First Transmission Part 904 Coil 905 Vibration Transmission Sheet 906 Second transmission part 907 Magnetic System 910 Silicone parts 911 Vibration Transmission Sheet 912 Coil 913 Connection parts 914 Nut Assembly 915 Upper magnet 916 Magnetic Conductive Plate 917 Lower Magnet 918 Magnetic Conductive Cover 919 Multi-function Key PCB 920 Multi-function Button Silicone 921 Speaker Shell 922 Earhook Multifunction Button 923 Ear hook 1000 Bone Conduction Speaker 1001 Panel 1002 first side, housing 1003 First transmission part 1004 Coil 1100 Bone conduction speaker 1101 Drive unit 1102 Transmission parts 1103 Panel 1104 Reinforcement material 1105 Housing 1200 Bone conduction speaker 1201 Panel 1202 Housing 1203 First Transmission Part 1204 Coil 1207 Magnetic Systems 1300 Bone conduction speaker 1301 Panel 1302 Housing 1303 First Transmission Part 1304 Coil 1305 Vibration transmission sheet 1306 Second transmission part 1307 Magnetic Systems 1400 Bone conduction speaker 1401 Panel 1402 Housing 1403 First Transmission Part 1404 Coil 1405 Vibration transmission sheet, vibration plate 1406 Second transmission part 1407 Magnetic Systems 1500 Bone conduction speaker 1501 Panel 1502 Housing 1503 First Transmission Part 1504 Coil 1505 First vibration transmission sheet 1506 Second vibration transmission sheet 1507 Second transmission part, first transmission part 1508 Magnetic Systems 1600 Bone conduction speaker 1601 Panel 1602 Housing 1603 First transmission part 1604 Second transmission part 1605 Drive unit 1606 Drive unit 1700 methods 3071 First magnetic part 3072 First magnetic conductive part 3073 Second magnetic conductive part 9101 Silicone 9102 Vibration Plate 9111 Bracket 9112 Vibration transmission sheet 9141 Bolt 9142 Nut 13021 First Housing 13022 Third transmission part 91111 Main unit, bracket main unit 91112 Facade 91113 Reinforcement material

Claims

1. A bone conduction speaker, comprising: A drive device configured to generate a drive force; a panel communicatively connected to the driver, all or a portion of the panel configured to contact a body of a user to conduct sound; and a first transmission component mechanically connected to the drive device and the panel so as to transmit the drive force from the drive device to the panel; Equipped with a part of the first transmission part is a flange and another part of the first transmission part is a connecting rod; A bone conduction speaker, characterized in that the flange of the first transmission part is located in a path that transmits the driving force from the driving device to the panel.

2. The drive unit includes a coil and a magnetic system; the flange is mechanically connected to one end surface of the coil; 2. The bone conduction speaker of claim 1, wherein the connecting rod is mechanically connected to the panel.

3. The vibration transmitting device further includes a second transmitting component and a vibration transmitting sheet, 3. The bone conduction speaker according to claim 2, wherein the second transmission part is mechanically connected to the magnetic system and the vibration transmission sheet.

4. the coil is connected to the panel via a first transmission path; The bone conduction speaker according to claim 2 , wherein the magnetic system is connected to the panel via a second transmission path.

5. The bone conduction speaker according to claim 4 , wherein the first transmission path includes a connection part.

6. The bone conduction speaker according to claim 5 , wherein the second transmission path includes a vibration transmission sheet.

7. The bone conduction speaker according to claim 6 , wherein the rigidity of the connection part is greater than the rigidity of the vibration transmission sheet.

8. The bone conduction speaker according to claim 5, wherein the connecting part is provided with a reinforcing material.

9. The bone conduction speaker according to claim 8, characterized in that the reinforcing material is a facade or a support rod.

10. a housing for receiving the drive unit; The bone conduction speaker of claim 2, characterized in that the connecting part includes a hollow cylinder, one end surface of the hollow cylinder is connected to one end surface of the coil, and the other end surface of the hollow cylinder is connected to at least one of the panel and the housing.

11. a housing for receiving the drive unit; The bone conduction speaker of claim 2, characterized in that the connecting parts include a group of connecting rods, one end of each of the connecting rods being connected to one end face of the coil and the other end of each of the connecting rods being connected to at least one of the panel and the housing, each of the connecting rods being arranged circumferentially around the coil.

12. an area where the panel interacts with the user's body has a normal; 2. The bone conduction speaker of claim 1, wherein the angle between the normal and the longitudinal axis of the first transmission part is an acute angle.

13. The bone conduction speaker according to claim 1 , wherein the two resonance peaks of the bone conduction speaker are less than 500 Hz.

14. a housing for receiving the drive unit; The bone conduction speaker according to claim 1 , wherein the housing is connected to the panel via a connection medium.

15. a housing for receiving the drive unit; The bone conduction speaker according to claim 1 , wherein the housing and the panel are integrally formed.

Images