RU2780549C2 - Bone conductivity dynamic - Google Patents

Abstract

FIELD: acoustics.

SUBSTANCE: invention relates to acoustics, in particular to speakers based on bone conduction. A bone conduction speaker comprising a panel and at least two drivers, wherein: the panel is communicatively coupled to each of the two drivers; all or part of the panel is configured to contact or abut the user's body to conduct sound; an area where a panel in contact with or adjacent to the user's body has a normal line. Both driving devices include a first driving device and a second driving device, the axis of the first driving device is parallel to the normal line, the axis of the second driving device is perpendicular to the normal line; and each of the at least two drivers comprises a coil and a magnetic system, the axis of the driver being perpendicular to the radial plane of the coil and/or the radial plane of the magnetic system.

EFFECT: noise reduction.

10 cl, 21 dwg

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] The present invention claims the priority of Chinese Patent Application No. 201810623408.2, filed June 15, 2018, the contents of which are incorporated herein by reference.

FIELD OF TECHNOLOGY TO WHICH THE INVENTION RELATES

[0002] The present invention generally relates to a speaker, and more particularly to a method for improving the sound quality of a bone conduction speaker or bone conduction headset.

BACKGROUND OF THE INVENTION

[0003] In general, people can hear sound because this sound vibration can be transmitted to the eardrum through the external auditory canal of the outer ear through the air. The vibration of the tympanic membrane can excite the human auditory nerve to perceive the vibration of the sound. When the bone conduction speaker works, the vibration of sound can be transmitted to the human auditory nerve through human skin, subcutaneous tissue and bones, so that people can hear the sound.

SUMMARY OF THE INVENTION

[0004] One embodiment of the present invention provides a bone conduction speaker. The bone conduction speaker may include a driver and a panel. The driving device may be configured to generate a driving force, and the driving force is oriented along a straight line. The panel can be connected with the possibility of transmission with the exciter. The panel may be configured to conduct sound. The area through which the panel interacts with the user's body can have a normal line. The normal line may not be parallel to this straight line.

[0005] In some embodiments, a straight line may have a positive direction pointing away from the bone conduction speaker through the panel, a normal line may have a positive direction pointing away from the bone conduction speaker, and the angle between the two lines in the positive direction may be sharp corner.

[0006] In some embodiments, the drive device may include a coil and a magnet system. The axis of the coil and the axis of the magnetic system may not be parallel to the normal line. 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. The body may be connected to the panel by a connecting medium, or the body and the panel may be formed as a single unit.

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

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

[0010] In some embodiments, the stiffness of a component in 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, a stiffening element may be provided on the connecting component.

[0012] In some embodiments, the stiffener may be a face or a support bar.

[0013] In some embodiments, the connecting component may be a hollow cylinder. One end surface of the hollow cylinder can be connected to one end surface of the coil, and the other end surface of the hollow cylinder can be connected to at least one of the panel and the body.

[0014] In some embodiments, the connection component may be a group of connecting rods. One end of each connecting rod can be connected to one end surface of the coil, and the other end of each connecting rod can be connected to at least one of the panel and the housing. Each connecting rod can be distributed in a circle around the coil.

[0015] In some embodiments, the driving force may have a component in at least one of the first quadrant and the third quadrant of the xoy plane coordinate system. The origin o of the coordinate system of the xoy plane may be located on the contact surface of the speaker based on bone conduction with the user's body. The x-axis can be parallel to the human coronal axis. The y-axis can be parallel to the human sagittal axis. The positive direction of the x-axis may be oriented outward of the user's body. The positive direction of the y-axis can be oriented towards the front side of the human body.

[0016] In some embodiments, the number of drivers may be at least two. The straight line along which the net force generated by the driving forces generated by each driving device is oriented may not be parallel to the normal line.

[0017] In some embodiments, the straight line along which the first drive force generated by the first drive device is oriented may be parallel to the normal line, and the straight line along which the second drive force generated by the second drive device is oriented may be perpendicular to the line normals.

[0018] In some embodiments, the panel area may range from 20 mm ² to 1000 mm ² .

[0019] In some embodiments, the panel length side length 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 a straight line along which the driving force is oriented and a normal line. The angle can have a value between 5° and 80°, or a value between 15° and 70°, or a value between 25° and 50°, or a value between 25° and 40°, or a value between 28° and 35°, or a value between 27° to 32°, or a value of 30° to 35°, or a value of 25° to 60°, or a value of 28° to 50°, or a value of 30° to 39°, or a value of 31° to 38° , or a value between 32° and 37°, or a value between 33° and 36°, or a value between 33° and 35.8°, or a value between 33.5° and 35°.

[0021] In some embodiments, the angle between the straight line along which the driving force is oriented and the normal line 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 through which the panel interacts with the user's body may be a plane.

[0023] In some embodiments, the area through which the panel interacts with the user's body may be a quasi-plane. The area normal line may be an average area normal line. The average normal line can be represented as:

;

;

обозначает усредненную линию нормали,

обозначает линию нормали в любой точке на плоскости, и

обозначает бесконечно малую плоскость. Квазиплоскость может быть плоскостью, где угол между линией нормали в точке на по меньшей мере 50% плоскости и усредненной линией нормали меньше заранее определенного порога.where

denotes the average normal line,

denotes a normal line at any point on the plane, and

denotes an infinitesimal plane. The quasi-plane may be a plane where the angle between the normal line at a point on at least 50% of the plane and the average normal line is less than a predetermined threshold.

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

[0025] Another embodiment of the present invention provides for another bone conduction speaker. The bone conduction speaker may include a panel and a driver. The panel can be connected with the possibility of transmission with the exciter. The panel may be configured to conduct sound. The area through which the panel interacts with the user's body can have a normal line. The axis of the exciter may not be parallel to the normal line. The drive device may include a coil and a magnet system. The axis of the exciter may be perpendicular to the radial plane of the coil and/or the radial plane of the magnetic system.

[0026] In some embodiments, the bone conduction speaker may further include a housing. The body may be connected to the panel by a connecting medium, or the body and the panel may be formed as a single unit.

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

[0028] In some embodiments, a stiffening element may be provided on the connecting component.

[0029] In some embodiments, the stiffener may be a face or a support bar.

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

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

[0032] In some embodiments, the connection component may be a group of connecting rods. One end of each connecting rod can be connected to one end surface of the coil, and the other end of each connecting rod can be connected to the panel and/or housing. Each connecting rod can be distributed in a circle around the coil.

[0033] In some embodiments, the area through which the panel interacts with the user's body may be a plane.

[0034] In some embodiments, the area through which the panel interacts with the user's body may be a quasi-plane. The area normal line may be an average area normal line. The average normal line can be represented as:

;

;

обозначает усредненную линию нормали,

обозначает линию нормали в любой точке на плоскости, и

обозначает бесконечно малую плоскость. Квазиплоскость может быть плоскостью, где угол между линией нормали в точке на по меньшей мере 50% плоскости и усредненной линией нормали меньше заранее определенного порога.where

denotes the average normal line,

denotes a normal line at any point on the plane, and

denotes an infinitesimal plane. The quasi-plane may be a plane where the angle between the normal line at a point on at least 50% of the plane and the average normal line is less than a predetermined threshold.

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

[0036] In some embodiments, the panel area may range from 20 mm ² to 1000 mm ² .

[0037] In some embodiments, the panel length side length 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 drive axis may have a positive direction pointing away from the bone conduction speaker through the panel, the normal line may have a positive direction pointing away from the bone conduction speaker, and the angle between the two lines in the positive direction may be an acute angle.

[0039] In some embodiments, the angle between the straight line along which the drive force is oriented and the normal line may be 5° to 80°, or 15° to 70°, or 25° to 50°, or a value between 25° and 40°, or a value between 28° and 35°, or a value between 27° and 32°, or a value between 30° and 35°, or a value between 25° and 60°, or a value between 28° to 50°, or a value from 30° to 39°, or a value from 31° to 38°, or a value from 32° to 37°, or a value from 33° to 36°, or a value from 33° to 35.8° , or a value between 33.5° and 35°.

[0040] In some embodiments, the angle between the straight line along which the driving force is oriented and the normal line 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 invention provides for 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 driving devices. The panel may be configured to conduct sound. The area through which the panel interacts with the user's body may have a normal line. The axis of the first driver may be parallel to the normal line, and the axis of the second driver may be perpendicular to the normal line. The drive device may include a coil and a magnet system. The axis of the exciter may be perpendicular to the radial plane of the coil and/or the radial plane of the magnetic system.

[0042] In some embodiments, the area through which the panel interacts with the user's body may be a plane.

[0043] In some embodiments, the area through which the panel interacts with the user's body may be a quasi-plane. The area normal line may be an average area normal line. The average normal line can be represented as:

;

;

обозначает усредненную линию нормали,

обозначает линию нормали в любой точке на плоскости, и

обозначает бесконечно малую плоскость. Квазиплоскость может быть плоскостью, где угол между линией нормали в точке на по меньшей мере 50% плоскости и усредненной линией нормали меньше заранее определенного порога.where

denotes the average normal line,

denotes a normal line at any point on the plane, and

denotes an infinitesimal plane. The quasi-plane may be a plane where the angle between the normal line at a point on at least 50% of the plane and the average normal line is less than a predetermined threshold.

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

[0045] Another embodiment of the present invention provides for a bone conduction headset. The bone conduction headset may include the bone conduction speaker described above.

[0046] Another embodiment of the present invention provides a method for establishing a speaker based on bone conduction. The method may include providing a panel that is communicably coupled to the driving device. The driving force can be located in a straight line. The panel may be configured to conduct sound. The area through which the panel interacts with the user's body may have a normal line. The method may also include setting the relative position of the driver and the panel such that the straight line is not parallel to the normal line.

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

[0048] In some embodiments, the number of drivers may be at least two, and the method may include setting the relative positions of each driver and panel such that a straight line along which the resulting force generated by the driving forces is oriented generated by each exciter is not parallel to the normal line.

[0049] In some embodiments, the area through which the panel interacts with the user's body may be a plane.

[0050] In some embodiments, the area through which the panel interacts with the user's body may be a quasi-plane. The area normal line may be an average area normal line. The average normal line can be represented as:

;

;

обозначает усредненную линию нормали,

обозначает линию нормали в любой точке на плоскости, и

обозначает бесконечно малую плоскость. Квазиплоскость может быть плоскостью, где угол между линией нормали в точке на по меньшей мере 50% плоскости и усредненной линией нормали меньше заранее определенного порога.where

denotes the average normal line,

denotes a normal line at any point on the plane, and

denotes an infinitesimal plane. The quasi-plane may be a plane where the angle between the normal line at a point on at least 50% of the plane and the average normal line is less than a predetermined threshold.

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

BRIEF DESCRIPTION OF THE DRAWINGS

[0052] The present invention is further described in accordance with an executive embodiment. These executive embodiments are described in detail with reference to the drawings. These embodiments are non-limiting executive embodiments in which like reference numerals indicate like structures in at least two of the drawing views, where:

[0053] FIG. 1 is a diagram showing an application scenario and structure of an exemplary bone conduction speaker according to some embodiments of the present invention;

[0054] FIG. 2 is a diagram showing an exemplary angle direction according to some embodiments of the present invention;

[0055] FIG. 3 is a diagram showing the structure of an exemplary bone conduction speaker on human skin and bones in accordance with some embodiments of the present invention;

[0056] FIG. 4 is a diagram illustrating the angular displacement relationship of an exemplary bone conduction speaker according to some embodiments of the present invention;

[0057] FIG. 5 is a diagram showing the frequency response curve of an exemplary bone conduction speaker according to some embodiments of the present invention;

[0058] FIG. 6 is a diagram showing the low frequency portion of the frequency response curve of an exemplary bone conduction speaker at various angles θ according to some embodiments of the present invention;

[0059] FIG. 7 is a diagram showing the high frequency portion of the frequency response curve of an exemplary bone conduction speaker with various panel and cabinet materials, in accordance with some embodiments of the present invention;

[0060] FIG. 8 is a diagram showing an axial sectional structure of an exemplary bone conduction speaker according to Embodiment 1 of the present invention;

[0061] FIG. 9A is a diagram showing an axial sectional structure of an exemplary bone conduction speaker according to Embodiment 2 of the present invention;

[0062] FIG. 9B is a diagram showing an exploded structure of an exemplary bone conduction speaker according to Embodiment 2 of the present invention;

[0063] FIG. 9C is a diagram showing a longitudinal sectional structure of an exemplary bone conduction speaker in FIG. 9B according to some embodiments of the present invention;

[0064] FIG. 9D and 9E are diagrams showing brace structures in illustrative bone conduction dynamics according to some embodiments of the present invention;

[0065] FIG. 10 is a diagram showing an axial section structure of an exemplary bone conduction speaker according to Embodiment 3 of the present invention;

[0066] FIG. 11 is a diagram showing an axial sectional structure of an exemplary bone conduction speaker according to Embodiment 4 of the present invention;

[0067] FIG. 12 is a diagram showing an axial sectional structure of an exemplary bone conduction speaker according to Embodiment 5 of the present invention;

[0068] FIG. 13 is a diagram showing an axial section structure of an exemplary bone conduction speaker according to Embodiment 6 of the present invention;

[0069] FIG. 14 is a diagram showing an axial sectional structure of an exemplary bone conduction speaker according to Embodiment 7 of the present invention;

[0070] FIG. 15 is a diagram showing an axial sectional structure of an exemplary bone conduction speaker according to Embodiment 8 of the present invention;

[0071] FIG. 16 is a diagram showing an axial sectional structure of an exemplary bone conduction speaker according to Embodiment 9 of the present invention; and

[0072] FIG. 17 is a flowchart illustrating a method for establishing a bone conduction speaker, in accordance with some embodiments of the present invention.

DETAILED DESCRIPTION

[0073] To illustrate the technical solutions associated with the embodiments of the present invention, the following is a brief presentation of the drawings mentioned in the description of the embodiments. Obviously, the drawings described below are only some examples or embodiments of the present invention. Those skilled in the art, without additional creative effort, can apply the present invention to other similar scenarios according to these drawings.

[0074] As used in the description of the invention and the following claims, the singular forms include the plural forms, unless the content clearly implies otherwise. Additionally, it should be understood that the terms "comprises", "comprising", "includes" and/or "including" used in the description of the invention indicate the presence of the specified steps and elements, but do not exclude the presence or addition of one or more other stages and elements. The term "based" means "based at least in part". 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, "only A, only B, or both A and B". Appropriate definitions of other terms are given in the following description.

[0075] Hereinafter, without loss of generality, the description of "bone conduction speaker" or "bone conduction headset" will be used in describing bone conduction related technologies in the present invention. This description is only a variation of the application of bone conduction. For a person skilled in the art, "speaker" or "headphone" can also be replaced by other similar words, for example, "player", "hearing aid" and the like. In fact, various implementations of the present invention are readily applicable to other non-speaker type hearing devices. For example, those skilled in the art, having understood the basic principles of a bone conduction speaker, may propose various modifications and changes regarding the form and details of specific methods and steps for implementing a bone conduction speaker without going beyond this principle. In particular, an external sound recording and processing function can be added to the bone conduction speaker so that the speaker can realize the function of a hearing aid. For example, microphones can pick up the external sound of the user/carrier and, according to some algorithm, transmit the processed sound (or generated electrical signal) to the speaker section based on bone conduction. Thus, the bone conduction speaker can be modified to include an external sound detection function, and transmit the processed sound after some signal processing to the user/wearer through the bone conduction speaker part, thus realizing the function of the bone conduction hearing aid. . By way of example only, the algorithm mentioned herein may include noise reduction, automatic gain control, acoustic feedback suppression, wide dynamic range compression, active ambient recognition, active mic-effect cancellation, directional processing, tinnitus processing, multi-channel wide dynamic range compression , active howling suppression, volume control, etc., or any combination thereof.

[0076] A bone conduction speaker transmits sound through the bones to the auditory system so that people can hear the sound. In general, a bone conduction speaker generates and conducts sound in the following steps. In step 1, the bone conduction speaker may receive or generate a signal containing audio information, such as a current signal and/or a voltage signal that contains audio information. In step 2, the driving device, also referred to as the conversion device, of the bone conduction dynamics can generate a vibration based on the signal. In step 3, the transmission component can transmit vibration to the panel or speaker cabinet.

[0077] In step 1, the bone conduction speaker may receive or generate a signal containing audio information in various ways. Audio information can refer to video or audio files with a specific data format, or data or files that can be converted to audio in one way or another. The signal containing audio information may come from the storage unit of the bone conduction speaker itself, or come from a system that generates, stores, or transmits information other than the bone conduction speaker. The audio signal discussed here may not be limited to an electrical signal, but may include any other form, such as an optical signal, a magnetic signal, a mechanical signal, and the like, which contains audio information that can be processed to generate vibration. The audio signal may not be limited to one signal source, but may come from multiple signal sources. Multiple signal sources may or may not be linked to each other. The transmission or generation of audio signals may be wired or wireless, and may be real-time or delayed. For example, a bone conduction speaker may receive an electrical signal containing audio information via a wired or wireless connection, or directly receive data from a storage medium to generate an audio signal. In some embodiments, a sound collecting component may be added to a bone conduction hearing aid and an external audio signal may be received and processed to achieve a noise reduction effect. A wired connection may include, but is not limited to, a metal cable, an optical cable, a metal and optical combo cable, and the like. The metal and optical combo cable can include coaxial cable, communication cable, flexible cable, spiral cable, non-metallic braided cable, metal braided cable, multi-core cable, twisted pair cable, ribbon cable, shielded cable, telecommunication cable, two-core cable, parallel pair conductors or twisted pair.

[0078] The above-described embodiments are provided for convenience of explanation only. The wired connection medium can also be of other types, such as other media for transmitting an electrical or optical signal. A wireless connection may include, but is not limited to, radio communication, optical communication in empty space, acoustic communication, or electromagnetic induction. Radio communication may include, but is not limited to, the IEEE 302.11 set of standards, the IEEE 302.15 set of standards (e.g., Bluetooth technology, Zigbee technology, etc.), first generation mobile technology, second generation mobile technology (e.g., FDMA, TDMA, SDMA, CDMA, SSMA, etc.), general packet radio service technology, third generation mobile communication technology (such as CDMA2000, WCDMA, TD-SCDMA, WiMAX, etc.), fourth generation mobile communication technology ( e.g. TD-LTE, FDD-LTE, etc.), satellite communications (e.g. GPS technology, etc.), near field communication (NFC), or other technologies operating in the ISM band (e.g. 2.4 GHz). Optical communication in empty space may include, but is not limited to, visible light, infrared, and the like. Acoustic communication may include, but is not limited to, an acoustic wave, an ultrasonic signal, and the like. Electromagnetic induction may include, but is not limited to, proximity technology. The above-described embodiments are provided for convenience of explanation only. Other types of wireless media are also possible, such as Z-wave technology, other paid civilian RF bands, or military RF bands. For example, as some exemplary technology scenarios, a bone conduction speaker may receive signals containing audio information from other devices via Bluetooth technology, or may directly receive data from a bone conduction speaker storage unit and then generate audio signals.

[0079] This storage device/storage unit refers to a storage device in a storage system including direct access storage, network storage, and storage area network. Storage devices may include, but are not limited to, general types of storage devices such as solid state storage device (e.g., solid state drive, hybrid hard drive, etc.), mechanical hard drive, USB flash drive, memory, memory card (for example, CF, SD, etc.), other drive (for example, CD, DVD, HD DVD, Blu-ray, etc.), random access memory (RAM), read-only memory (ROM) etc. RAM may include, but is not limited to, decatron, selectron, delay line memory, Williams tubes, dynamic random access memory (DRAM), static random access memory (SRAM), thyristor random access memory (T-RAM), zero capacity random access memory (Z -RAM), etc. ROM may include, but is not limited to, cylindrical magnetic domain memory, twistor memory, film memory, cylindrical magnetic film memory, magnetic core memory, magnetic drum memory, CD-ROM, hard disks, tapes, 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- RAM, running memory, resistive RAM, programmable metallization unit, etc. The above storage device/storage unit is a list of some examples. The storage device/storage unit may use a storage device that is not limited to this.

[0080] FIG. 1 is a diagram showing the application scenario and structure of an exemplary bone conduction speaker according to some embodiments of the present invention. As shown in FIG. 1, a bone conduction speaker may include a driver 101, a transmission component 102, a panel 103, a cabinet 104, and the like. The driver device 101 may transmit a vibration signal to the panel 103 and/or housing 104 through the transmission component 102, thereby transmitting sound to the human body due to the contact of the panel 103 or housing 104 with human skin. In some embodiments, bone 103 and/or bone conduction speaker housing 104 may contact human skin on the tragus, thereby transmitting sound to the human body. In some embodiments, the panel 103 and/or housing 104 may also be in contact with human skin on the back of the pinna.

[0081] A bone conduction speaker can convert a signal containing sound information into vibration and generate sound. Vibration generation can be accompanied by energy transformation. A bone conduction speaker can use a specific exciter to convert the signal into mechanical vibration. The transformation process may involve the coexistence and transformation of several different types of energy. For example, an electrical signal can be directly converted into a mechanical vibration through a conversion device to generate sound. As another example, the optical signal may contain audio information, the driver may perform a process of converting the optical signal into a vibration signal, or the driver 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 may coexist and be converted during operation of the driving device may include thermal energy, magnetic field energy, and the like. Drive energy conversion methods may include, but are not limited to, moving coil, electrostatic, piezoelectric, moving core, pneumatic, electromagnetic, and the like. The frequency response range and sound quality of a bone conduction speaker can be affected by different conversion methods and different physical components of the driver. For example, in a dynamic coil type converting device, a wound cylindrical coil may be mechanically connected to a vibration transmission sheet, and the coil may be driven by a current signal in a magnetic field to drive the vibration transmission sheet to generate sound. The tension or contraction of the material, the deformation of the folds, the size, shape, or attachment method of the folds of the vibration transmission sheet, and the magnetic field strength of the permanent magnets can have a great influence on the final sound quality of a bone conduction speaker. As yet another example, the vibration transmission sheet may have a mirror symmetrical structure, a centrally symmetrical structure, or an asymmetric structure. A discontinuous hole structure can be provided on the vibration transmission sheet, which can lead to a large displacement of the vibration transmission sheet, whereby the bone conduction speaker can achieve higher sensitivity and increase vibration and sound output. As another example, the vibration transmission sheet may have a toroidal structure, and several posts may be arranged in a torus converging towards the center.

[0082] Obviously, those skilled in the art, having understood the basic principles of conversion methods and specific devices that can affect the sound quality of a bone conduction speaker, can offer appropriate options for choosing, combining, adjusting or changing these influencing factors without leaving beyond this principle, to obtain the ideal sound quality. For example, high density permanent magnets and more ideal vibration plate materials or design can be used to achieve improved sound quality.

[0083] As used herein, the term "sound quality" can be understood in relation to sound quality, and refers to the fidelity of an audio signal after processing, transmission, or other processes. Sound quality is mainly determined by three elements: volume, tone and timbre. Loudness refers to the subjective perception of the strength of a sound by human care, which can be proportional to the logarithm of the intensity of the sound. The larger the logarithm of the intensity of a sound, the louder it sounds. Loudness can also be related to the frequency and waveform of the sound. Tone, also referred to as pitch, refers to the subjective perception of the frequency of sound vibrations by the human ear. The tone can be mainly determined by the fundamental frequency of the sound. The higher the fundamental frequency, the higher the tone. Tone can also be related to the intensity of the sound. Timbre refers to the subjective perception of sound characteristics by the human ear. Timbre can be mainly determined by the spectral structure of the sound and can also be related to factors such as loudness, duration, the settling or decaying process of the sound. The spectral structure of sound can be described by the fundamental frequency, the number of harmonic frequencies, the distribution of harmonic frequencies, the magnitude and the phase relationship. Different structures of the spectrum may differ in timbre. Even if the fundamental frequencies and volume of the two sounds are the same, if the harmonic structures of the two sounds are different, the timbre may also differ.

[0084] As shown in FIG. 1, according to a bone conduction speaker illustrated by some embodiments of the present invention, the drive force that is generated by the drive device may be oriented along a straight line B (in other words, in the direction of the drive force vibration). The straight line B and the normal line A to the panel 103 may form an angle θ. In other words, line B is not parallel to line A.

[0085] The panel may have areas of contact or closure with the user's body, such as human skin. It should be understood that when the panel is covered with other materials (eg, soft materials such as silicone) to improve the wearer's comfort, the panel and the user's body may be adjacent to each other instead of being in direct contact. In some embodiments, when the bone conduction speaker is worn on the user's body, all areas of the panel may contact or mate with 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 interlock with the user's body. In some embodiments, the area of the panel used for contact or closure with the user's body may occupy more than 50% of the area of the panel, and more preferably, may occupy more than 60% of the area of the panel. In general, the area of the panel where the panel is in contact with or adjacent to the user's body may be a plane or a curved surface.

[0086] In some embodiments, when the area of the panel where the panel in contact with or adjacent to the user's body is a plane, a normal line to it may meet the general definition of a normal line. In some embodiments, when the area of the panel where the panel in contact with or adjacent to the user's body is a curved surface, the normal line to it may be an average normal line to the area.

[0087] The average normal line may be given by the following equation:

, ур. (1)

, ur. (one)

обозначает усредненную линию нормали,

обозначает линию нормали в любой точке поверхности,

обозначает бесконечно малую плоскость.where

denotes the average normal line,

denotes a normal line at any point on the surface,

denotes an infinitesimal plane.

[0088] Additionally, the curved surface may be a near-flat quasi-plane, that is, a plane for which the angle between the normal line at any point in at least 50% of the plane and the average normal line is less than a predetermined threshold. In some embodiments, the threshold may be less than 10°. In some embodiments, the threshold may further be less than 5°.

[0089] In some embodiments, the line B along which the driving force is oriented and the line A' normal to the area on the panel 103 to contact or abut the user's body may have an angle θ. The value of the angle θ may range from 0° to 180°, and may further range from 0° to 180°, but not 90°. In some embodiments, if straight line B has a positive direction pointing away from the bone conduction speaker and if line A is normal to panel 103 (or line A' is normal to an area on panel 103 for contact with or adjacent to the user's body) also has a positive direction pointing away from the bone conduction speaker, the angle θ between straight line A or A′ and straight line B in their positive directions may be an acute angle, i.e. 0° < θ < 90°.

[0090] FIG. 2 is a diagram showing an exemplary angle direction according to some embodiments of the present invention. As shown in FIG. 2, in some embodiments, the drive force generated by the drive device may have a component in the first quadrant and/or third quadrant of the xoy plane coordinate system. The coordinate system of the xoy plane is the reference coordinate system. The origin o may be located on the contact surface of the panel and/or housing with the human body after the bone conduction speaker is put 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 oriented outward of the human body, and the positive direction of the y-axis may be oriented towards the front side of the human body. Quadrants should be understood as four regions separated by a horizontal axis (eg, x-axis) and a vertical axis (eg, y-axis) in a rectangular plane coordinate system. Each area can be called a quadrant. Each quadrant can be centered at the origin, and the x-axis and y-axis are division lines. The upper right region (the region enclosed between the positive x-axis and the positive y-axis) may be referred to as the first quadrant. The upper left region (the region enclosed between the negative x-axis and the positive y-axis) may be referred to as the second quadrant. The lower left region (the region enclosed between the negative x-axis and the negative y-axis) may be referred to as the third quadrant. The lower right region (the region enclosed between the positive x-axis and the negative y-axis) may be referred to as the fourth quadrant. The points on the coordinate axis do not belong to any quadrant. It should be understood that the driving force described herein may be located directly in the first quadrant and/or the third quadrant of the coordinate system of the xoy plane. The driving force may also be oriented in other directions, wherein the projection or component in the first quadrant and/or third quadrant of the xoy plane coordinate system is not 0, and the projection or component in the z-axis direction may or may not be 0. The z-axis may be perpendicular to the xoy plane and pass through the origin o. In some embodiments, the minimum angle θ between the line along which the drive force is oriented and the line normal to the area on the panel to contact or abut the user's body may be an arbitrary acute angle. For example, the angle θ may be in the preferred range of 5° to 80°, in the more preferred range of 15° to 70°, in the even more preferred range of 25° to 60°, in the even more preferred range of 25° to 50° , in an even more preferred range of 28° to 50°, in an even more preferred range of 30° to 39°, in an even more preferred range of 31° to 38°, in an even more preferred range of 32° to 37°, in an even more preferred range of 33° to 36°, an even more preferred range of 33° to 35.8°, and an even more preferred range of 35.5° to 35°. In particular, the angle θ can be 26°, 27°, 28°, 29°, 30°, 31°, 32°, 33°, 34°, 34.2°, 35°, 35.8°, 36° , 37° or 38° etc. The error can be controlled within 0.2 degree. It should be noted that the description of the driving force direction should be understood as a limitation of the driving force in the present invention. In some other embodiments, the drive force may also have components in the second and fourth quadrants of the xoy plane coordinate system, may be located on the y axis, and the like.

[0091] FIG. 3 is a diagram showing the structure of an exemplary bone conduction speaker on human skin and bones in accordance with some embodiments of the present invention. The bone conduction speaker can receive, select, or generate a signal containing sound information, and convert the sound information into sound vibration through an exciter. The vibration may be transmitted to the human skin 320 in contact with the panel or body via the transmission component, and the vibration may further be transmitted to the human skeleton 310 such that the user hears the sound. Without loss of generality, the subjects of the auditory system and sense organs described above can be humans or animals with auditory systems. It should be noted that the following description of human use of bone conduction speakers is not intended to limit the use scenario of bone conduction speakers. Similar descriptions may also apply to other animals.

[0092] As shown in FIG. 3, a 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.

[0093] The vibration of the panel 301 can be transmitted to the auditory nerve through tissues and bones, whereby people hear sound. The panel 301 may be in direct contact with human skin, or may be in contact with human skin through a vibration transmission layer composed of a specific material. The area where the panel 301 contacts the human body may be near the tragus, mastoid, behind the ear, or elsewhere.

[0094] The physical properties of the panel, such as mass, size, shape, stiffness, vibration damping, and the like, can affect the vibration efficiency of the panel. Those skilled in the art may select panels made from the proper materials according to actual needs, or use different molds to inject the panels into different shapes. For example, the panel may be rectangular, circular, or elliptical in shape. By way of another example, the shape of the panel may be a shape obtained by cutting the edge of a rectangle, circle, or ellipse (by way of example, but not limited to, symmetrical cutting of a circle to obtain a shape similar to an ellipse or race track, etc.). More preferably, the panel may be hollow. By way of example only, the area of the panel can be set as needed. In some embodiments, the area size of the panel may range from 20 mm ² to 1000 mm ² . In particular, 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, a panel may be a rectangle 22 mm long and 14 mm wide. As another example, the panel may be an ellipse with a major axis of 25 mm and a minor axis of 15 mm.

[0095] Panel materials mentioned herein may include, but are not limited to, steel, alloys, plastics, and one-component or composite materials. Steel may include, but is not limited to, stainless steel, carbon steel, and the like. Alloys may include, but are not limited to, aluminum alloys, chromium-molybdenum steels, 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), polyamides (PA), polyvinyl chloride (PVC), polyethylene, blown nylon, etc. One-component or composite materials may include, but are not limited to, fiberglass, carbon fiber, boron fiber, graphite fiber, graphene fiber, silicon carbide fiber, aramid fiber, or other reinforcing materials. The one-component or composite material may also include a composition of other organic and/or inorganic materials, such as glass fiber reinforced unsaturated polyester, various types of epoxy resin or phenolic resin matrix fiberglass, and the like.

[0096] In some other embodiments, the outer side of the bone conduction speaker panel may be wrapped with a skin-contact vibration transmission layer. The vibration system, which is composed of a panel and a vibration transmission layer, can transmit the generated sound vibration to human tissue. The vibration transmission layer may include multiple layers. The vibration transmission layer may be made of one or more materials, and the materials of the different vibration transmission layers may be the same or different. Multiple vibration transmission layers may be stacked in the vertical direction of the panel, positioned in the horizontal direction of the panel, or stacked 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 some absorption, flexibility, and chemical properties, such as plastics (for example, but not limited to, high molecular weight polyethylene, blown nylon, engineering plastic, etc.), rubber, or other one-component or composite materials that can achieve the same performance.

[0097] In some embodiments, when the bone conduction speaker is worn on the user's body, all areas of the panel may contact or interlock with the user's body. In some embodiments, when the bone conduction speaker is worn on the user's body, the panel portion may contact or interlock with the user's body. In some embodiments, the area of the panel used for contact or closure with the user's body may occupy more than 50% of the area of the panel, and more preferably, may occupy more than 60% of the area of the panel. In general, the user's skin is relatively flat. When the area where the panel is in contact with the skin is set in a plane or quasi-plane without large fluctuations, the area where the panel is in contact with the skin is enlarged, which increases its volume. For example, a panel may have a composite structure with a flat in the middle and an arcuate chamfer at the edges. This allows the panels to be in full contact with human skin and have a curved surface to ensure suitability for different people.

[0098] In some embodiments, the panel 301 may cooperate with the housing 302 to form a closed or quasi-closed cavity (eg, a hole in the panel or housing) for receiving a driving device. In particular, the panel 301 and the body 302 may be integrally formed, that is, the panel and the body may be made of the same material, and there is no distinction between them in structure. The panel 301 may also be mechanically connected to the housing 302 by snapping, riveting, hotmelt, or welding. In some other embodiments, the panel 301 and the housing 302 may be mechanically connected through a connecting medium. The bonding medium may include an adhesive such as polyurethane, polystyrene, polyacrylate, ethylene-vinyl acetate, shellac, butyl rubber, and the like. The connecting medium may also include connecting parts with specific structures, such as a vibration transmission sheet, a connecting rod, and the like. The rigidity of the cabinet, the rigidity of the panel, and the rigidity of the connection between the cabinet and the panel can affect the frequency response of a speaker. In some embodiments, both the body and the panel may be made of materials with increased rigidity, with relatively less rigidity in the interface between the body and the panel. When the driving device vibrates, the panel and body may vibrate asynchronously. In some other embodiments, both the housing and the panel may be made of materials with increased rigidity, and the rigidity of the connecting medium between the housing and the panel is also high, which may lead to an increase in the overall rigidity of the vibration system, and the resonant part may contain more high-frequency components. In some embodiments, the rigidity of the panel and cabinet can be increased by adjusting the stiffness of the panel and cabinet, and the peaks and valleys of the high frequency region can be adjusted to a higher frequency region. Additional descriptions regarding the relationship between component stiffness and sound quality can be found elsewhere in this application (see, for example, Fig. 7 and its description).

[0099] In some embodiments, the housing may have increased rigidity and reduced weight, and may be mechanically vibrated as a whole. The case can guarantee vibration consistency, provide mutual leakage suppression, guarantee good sound quality and high volume. In some embodiments, the body may or may not have holes. For example, the opening in the housing may be configured to adjust speaker leakage based on bone conduction.

[0100] Rigidity should be understood as the ability of a material or structure to resist elastic deformation under the action of a force, which may be related to the elastic modulus, shape, structure, or installation method of the component material. For example, the stiffness of a component is positively correlated with the modulus and thickness of the component, and negatively correlated with the surface area of the component. In some embodiments, the component may be a panel, housing, transmission component, or the like. In particular, the stiffness of a sheet component, such as a panel, can be expressed by the following expression:

, ур. (2)

, ur. (2)

обозначает жесткость панели,

обозначает модуль упругости панели,

обозначает толщину панели, и

обозначает радиус панели. Можно видеть, что чем меньше радиус, тем больше толщина, и тем больше модуль упругости панели, тем больше жесткость соответствующей панели. В некоторых других вариантах осуществления, жесткость стержневого или полосового компонента передачи можно выразить следующим выражением:where

indicates the rigidity of the panel,

denotes the modulus of elasticity of the panel,

denotes the thickness of the panel, and

denotes the panel radius. It can be seen that the smaller the radius, the greater the thickness, and the greater the elastic modulus of the panel, the greater the rigidity of the corresponding panel. In some other embodiments, the stiffness of the rod or strip component of the transmission can be expressed by the following expression:

, ур. (3)

, ur. (3)

обозначает жесткость компонента передачи,

обозначает модуль упругости компонента передачи,

обозначает толщину компонента передачи,

обозначает ширину компонента передачи, и

обозначает длину компонента передачи. Можно видеть, что чем меньше компонент передачи, тем больше толщина, тем больше ширина, и тем больше модуль упругости, тем больше жесткость соответствующего компонента передачи.where

denotes the stiffness of the transmission component,

denotes the modulus of elasticity of the transmission component,

denotes the thickness of the transmission component,

denotes the width of the transmission component, and

denotes the length of the transmission component. It can be seen that the smaller the transmission component, the greater the thickness, the greater the width, and the greater the elastic modulus, the greater the rigidity of the corresponding transmission component.

[0101] In some embodiments, the drive device may be located in an enclosed or quasi-enclosed space formed by the panel and housing (eg, with openings in the panel or housing). In some other embodiments, the drive device may be located in an enclosed or quasi-enclosed space defined by the housing and the panel is provided independently of the housing. Additional descriptions regarding the separate installation of the panel and housing can be found elsewhere in this application (see, for example, Fig. 15 and its description). The exciter may be configured to convert electrical signals into vibrations with different frequencies and amplitudes. Driving device operating modes may include, but are not limited to, moving coil, moving core, piezoelectric ceramics, or other modes of operation.

[0102] By way of example, the following description discusses the moving coil method. In FIG. 3, the driver may perform a method of driving a moving coil, and may include a coil 304 and a magnet system 307.

[0103] The magnetic system 307 may include a first magnetic component 3071, a first magnetically conductive component 3072, and a second magnetically conductive component 3073. The magnetic component described in the present invention is a component that can generate a magnetic field, such as a magnet. The magnetic component may have a magnetization direction, and the magnetization direction means the direction of the magnetic field in the magnetic component. The first magnetic component 3071 may include one or more magnets. In some embodiments, the magnet may include a metal alloy, ferrite, or the like magnet. The metal alloy for making the magnet may include neodymium-iron-boron, samarium-cobalt, aluminum-nickel-cobalt, iron-chromium-cobalt, aluminum-iron-boron, iron-carbon-aluminum, and the like. or any combination of them. The ferrite may include barium ferrite, steel ferrite, manganese ferrite, lithium manganese ferrite, and the like. or any combination of them.

[0104] The magnetically conductive component can also be referred to as a magnetic field concentrator or an iron core that can control the distribution of a magnetic field (eg, the magnetic field generated by the first magnetic component 3071). In some embodiments, the bottom surface of the first conductive component 3072 may be mechanically connected to the top surface of the first magnetic component 3071. The second conductive component 3073 may have a concave structure that may include a bottom wall and a side wall. The inner side of the bottom wall of the second magnetic component 3073 may be mechanically connected to the first magnetic component 3071, and the side wall may surround the first magnetic component 3071 and form a magnetic gap with the first magnetic component 3071. the magnetic component 3071 may include a glued joint, a latching joint, a welded joint, a riveted joint, a bolted joint, and the like. or any combination of them.

[0105] The magnetically conductive component may include an element made from a soft magnetic material. In some embodiments, an exemplary soft magnetic material may include a metal material, a metal alloy material, a metal oxide material, an amorphous metal material, and the like. For example, the soft magnetic material may include iron, iron silicon alloy, iron aluminum alloy, iron nickel alloy, iron cobalt alloy, mild steel, electrical steel sheet, ferrite, and the like. In some embodiments, the magnet may be manufactured by, for example, casting, plastic processing, cutting, powder metallurgy, and the like. or any combination of them. Casting may include sand casting, investment casting, pressure casting, spin casting, and the like. Plastic processing may include rolling, casting, forging, stamping, extrusion, drawing, and the like. or any combination of them. Machining may include turning, milling, planning, grinding, and the like. In some embodiments, the magnetically conductive component may be manufactured by 3D printing, a CNC machine, or the like.

[0106] It should be understood that the description of the design of the exciters should not be construed as a limitation of the present invention. In some embodiments, the implementation of the magnetic system may include several magnetic components that can be stacked on top of each other from top to bottom. An additional conductive component may be mounted between adjacent magnetic components, and another conductive component may be mounted on the upper surface of the upper magnetic component. The magnetic component may be a component configured to generate a magnetic field. The magnetically conductive component may be configured to adjust the distribution of the magnetic field. The structure of the magnetic system, set according to the specific requirements for the distribution of the magnetic field, can be used for the bone conduction speaker and without limitation in the present invention.

[0107] Coil 304 may be located in the magnetic gap between the first magnetic component 3071 and the second magnetically conductive component 3073. After applying an electric current, the coil 304 located in the magnetic gap can be driven in oscillatory motion by the Ampere force (i.e., the driving force). The magnetic system 307 may generate vibration under the action of a reaction force. The drive device may further include a transmission component 303 for transmitting the vibrations of the coil 304 and/or the magnet system 307 to the panel and/or housing. The ampere force can be the force that acts on a conductor in a magnetic field. The direction of the Ampère force can be perpendicular to the plane given by the direction of the conductor and the magnetic field, and can be determined b by the left hand rule. When the direction of the current and the direction of the magnetic field change, the direction of the Ampère force can also change. In some embodiments, the magnetic field generated by the magnetic system is static. When the direction of the current is reversed, the direction of the driving force can be reversed along a straight line. A straight line can be considered as a line along which the exciting force is oriented. The coil can generate vibration by driving force, and the magnetic system can also generate vibration by reaction force. In general, both can vibrate along the same straight line, but in opposite directions. A straight line can be thought of as a straight line along which the vibration occurs and can be equivalent (i.e., parallel) or identical to the straight line along which the driving force is oriented.

[0108] In some embodiments, the coil vibration may be transmitted to the panel and/or housing via the first transmission component, and the vibration of the magnetic system may be transmitted to the panel and/or housing via the second transmission component.

[0109] In some embodiments, after applying an electric current, the coil can generate vibration under the influence of the Ampère force. The vibration of the coil may be transmitted to the panel and/or housing via the first transmission component, and the coil may interact with the magnetic system via the magnetic field. The reaction force sensed by the magnet system may also generate vibration, and the vibration of the magnet system may be transmitted to the panel and/or housing via the second transmission component. In some embodiments, the transmission component may include a connecting rod, a connecting brace, and/or a vibration transmission sheet. In some embodiments, the transmission component may have a moderate resilient force to cause a damping effect in the vibration transmission process, which can reduce the vibration energy transmitted to the cabinet, thereby effectively suppressing the outward leakage of the bone conduction speaker due to the vibration of the cabinet, avoiding the occurrence of abnormal sounds caused by possible abnormal resonances, and achieving the effect of improving sound quality. The location of the transmission component in/on the housing can also affect the effectiveness of vibration transmission to varying degrees. In some embodiments, the transmission component may place the driver in different states, such as suspended or supported. The vibration transmission sheet may be small thickness shrapnel. The main body of a particular vibration transmission sheet may be an annular structure, and a plurality of branches or a plurality of fittings converging towards the center may be provided in the structure of the annular body. The number of branches or fittings may be two or more. Additional descriptions regarding transmission components can be found elsewhere in this application (see, for example, the "Specific Embodiment" section).

< θ <

. В некоторых вариантах осуществления, линия, вдоль которой ориентирована возбуждающая сила, может иметь положительное направление, указывающее от динамика на основе костной проводимости через панель (или поверхность, где панель и/или корпус контактирует с человеческой кожей), и линия нормали к указанной панели (или поверхности, где панель и/или корпус контактирует с человеческой кожей) может иметь положительное направление, указывающее от динамика на основе костной проводимости, угол между двумя линиями в положительном направлении может быть острым углом.[0110] In some embodiments, the straight line along which the driving force is oriented may be collinear or parallel to the straight line along which the driving device vibrates. For example, in a moving coil driving device, the direction of the driving force may be identical or opposite to the direction of vibration of the coil and/or the magnet system. The panel may be a flat or curved surface, or the panel may have multiple projections or grooves. In some embodiments, when a bone conduction speaker is worn on a user's body, the line normal to the area on the panel to contact or abut against the user's body is not parallel to the line along which the driving force is oriented. Generally speaking, the area on the panel to contact or abut the user's body is relatively flat, and in particular, may be a plane, or a quasi-plane with little change in curvature. When the area on the panel to contact or adjoin the user's body is a plane, the normal line at any point on the panel may be the line normal to the area. When the area on the panel to contact or adjoin the user's body is not a plane, the normal line to the area may be an average normal line. Additional descriptions regarding the average normal line can be found elsewhere in this application (see, for example, Fig. 1 and its description). In some embodiments, when the area on the panel to contact or abut the user's body is not a plane, a normal line to the area may be determined as follows. You can select a point in the area where the panel contacts human skin, you can define the tangent plane of the panel at the point, and then you can define a line passing through the point and perpendicular to the tangent plane. The straight line can be thought of as a line normal to the panel. According to a specific embodiment of the present invention, a straight line along which the driving force is oriented (or a straight line along which the driving device vibrates) may have an angle θ with the area normal line, and the angle

<θ<

. In some embodiments, the line along which the drive force is oriented may have a positive direction pointing away from the bone conduction speaker through the panel (or the surface where the panel and/or housing contacts human skin) and a normal line to said panel ( or surfaces where the panel and/or body contacts human skin) may have a positive direction pointing away from the bone conduction speaker, the angle between the two lines in the positive direction may be an acute angle.

[0111] In some embodiments, the bone conduction speaker 300 may include a panel 301, a housing 302, a first transmission component 303, a coil 304, a vibration transmission sheet 305, a second transmission component 306, and a magnet system 307. Coil vibrations 304 and magnetic system 307 may be transmitted to the panel 301 and/or housing 302 in different ways. For example, vibration of coil 304 may be transmitted to panel 301 and/or housing 302 via a first transmission path, and vibration of magnet system 307 may be transmitted to panel 301 and/or housing 302 via a second transmission path. The first transmission path may include a first transmission component 303, and the second transmission path may include a second transmission component 306, a vibration transmission sheet 305, and a first transmission component 303. In particular, part of the first transmission component 303 may be a flanged structure. The flange may have an annular shape adapted to the structure of the coil 304 and be mechanically connected to one end surface of the coil 304. Another part of the first transmission component 303 may be a connecting rod, and the connecting rod can be mechanically connected to the panel and/or housing. The coil 304 may be wholly or partially located within the magnetic gap of the magnet system 307. In the second transmission path, the second transmission component 306 may be mechanically coupled to the magnet system 307 and the vibration transmission sheet 305. The edge of the vibration transmission sheet 305 can be fixed to the flange of the first transmission component 303 . The center of the vibration transmission sheet 305 may be mechanically connected to one end of the second transmission component 306 . The edge of the vibration transmission sheet 305 may be mechanically connected to the inner side of the flange of the first transmission component 303, and the connection may include a clamp connection, a hot pressing connection, a riveted connection, an adhesive connection, an injection molding connection, and the like. It should be noted that the first transmission path and the second transmission path may also have other designs, and this embodiment should not be construed as limiting the transmission component. Additional descriptions regarding the transfer component can be found elsewhere in this application.

[0112] In some embodiments, both coil 304 and magnet system 307 may have ring structures. In some embodiments, coil 304 and magnet system 307 may have axes parallel to each other, and the axis of coil 304 or magnet system 307 may be perpendicular to the radial plane of coil 304 and/or the radial plane of magnet system 307. In some embodiments, coil 304 and the magnet 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 line to the panel 301 may have the above-mentioned angle θ.

[0113] In this embodiment, after applying electric current, the coil 304 can generate an ampere force and vibration in a magnetic field generated by the magnetic system 307, and transmit the vibration of the coil 304 to the panel 301 through the first transmission component 303. The vibration generated by the reaction force sensed by the magnet system 307 can be transmitted to the panel 301 via the second transmission component 306, the vibration transmission sheet 305, and the first transmission component 303. The vibration of the coil 304 and the vibration of the magnet system 307 can 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 can form a composite vibration that can be transmitted to the panel 301. The composite vibration can be transmitted to the skin and bones of the human body through the panel 301, so that people can hear sound based on bone conduction.

и деформацией

кожи. Когда возбуждающая сила, генерируемая возбуждающим устройством, параллельна линии нормали к панели 301 (т.е. угол θ равен нулю), соотношение между возбуждающей силой и полной деформацией кожи можно выразить уравнением:[0114] By way of example only, in connection with FIG. 3, can explain the relationship between the driving force

and deformation

skin. When the drive force generated by the drive device is parallel to the normal line of the panel 301 (i.e., the angle θ is zero), the relationship between the drive force and the total skin deformation can be expressed by the equation:

ур. (4)

ur. (four)

обозначает возбуждающую силу,

обозначает полную деформацию кожи в вертикальном направлении кожи,

обозначает модуль упругости кожи,

обозначает площадь контакта панели с кожей, и

обозначает полную толщину кожи (т.е. расстояние между панелью и костью).where

denotes an exciting force,

denotes a complete deformation of the skin in the vertical direction of the skin,

denotes the elasticity modulus of the skin,

denotes the area of contact of the panel with the skin, and

denotes the full thickness of the skin (i.e. the distance between the panel and the bone).

[0115] When the driving force of the driving device is perpendicular to the normal line of the area on the panel to contact or abut the user's body (i.e., the angle θ is 90 degrees), the relationship between the driving force in the vertical direction and the total deformation of the skin can be represented as equation:

ур. (5)

ur. (5)

обозначает возбуждающую силу,

обозначает полную деформацию кожи в направлении, параллельном коже,

обозначает модуль сдвига кожи,

обозначает площадь контакта панели с кожей, и

обозначает полную толщину кожи (т.е. расстояние между панелью и костью). Соотношение между модулем сдвига

и модулем упругости

можно представить в уравнении:where

denotes an exciting force,

denotes a complete deformation of the skin in a direction parallel to the skin,

stands for skin shear modulus,

denotes the area of contact of the panel with the skin, and

denotes the full thickness of the skin (i.e. the distance between the panel and the bone). Relationship between shear modulus

and modulus of elasticity

can be represented in the equation:

ур. (6)

ur. (6)

обозначает коэффициент Пуассона кожи, и

, поэтому модуль сдвига

меньше модуля упругости

, и соответствующая полная деформация кожи при одинаковой возбуждающей силе

. Обычно коэффициент Пуассона кожи близок к 0,4.where

denotes the Poisson's ratio of the skin, and

, so the shear modulus

less modulus of elasticity

, and the corresponding total deformation of the skin with the same excitatory force

. Typically, the Poisson's ratio of the skin is close to 0.4.

[0116] When the drive force of the drive device is not parallel to the normal line of the area on the panel to contact or abut the user's body, the horizontal drive force and the vertical drive force can be expressed in the following equations (7) and (8):

ур. (7)

ur. (7)

ур. (8)

ur. (eight)

и деформацией

кожи можно выразить в следующем уравнении (9):The ratio between the exciting force

and deformation

skin can be expressed in the following equation (9):

ур. (9)

ur. (9)

When the Poisson's ratio of the skin is 0.4, a detailed description of the relationship between the angle θ and the total deformation of the skin can be found in FIG. four.

кожи. С увеличением угла θ, относительное смещение уменьшается, и деформация

кожи в вертикальном направлении также уменьшается. И когда угол θ близок к 90 градусам, деформация

кожи в вертикальном направлении постепенно достигает 0.[0117] In FIG. 4 is a diagram illustrating the angular displacement relationship of an exemplary bone conduction speaker according to some embodiments of the present invention. As shown in FIG. 4, the relationship between the angle θ and the total deformation of the skin can be that the larger the angle θ and the larger the relative displacement, the larger the total deformation.

skin. As the angle θ increases, the relative displacement decreases and the deformation

skin in the vertical direction also decreases. And when the angle θ is close to 90 degrees, the deformation

skin in the vertical direction gradually reaches 0.

кожи. Чем больше

, тем больше громкость низкочастотной части костной проводимости. Громкость головных телефонов на основе костной проводимости в высокочастотной части может положительно коррелировать с деформацией

кожи в вертикальном направлении. Чем больше

, тем больше громкость низкочастотной части костной проводимости.[0118] Bone conduction headphone loudness in the low frequency portion can be positively correlated with overall strain

skin. The more

, the louder the low-frequency part of bone conduction is. Headphone volume based on bone conduction in the high-frequency portion may be positively correlated with deformity

skin in a vertical direction. The more

, the louder the low-frequency part of bone conduction is.

, и деформацией

кожи в вертикальном направлении можно найти на фиг. 4. Как показано на фиг. 4, соотношение между углом θ и полной деформацией

кожи может состоять в том, что чем больше угол θ, тем больше полная деформация

кожи и тем больше громкость низкочастотной части соответствующего головного телефона на основе костной проводимости. Как показано на фиг. 4, соотношение между углом θ и деформацией кожи в вертикальном направлении

может состоять в том, что чем больше угол θ, тем меньше деформация

кожи в вертикальном направлении и тем меньше громкость высокочастотной части соответствующих головных телефонов на основе костной проводимости.[0119] When the Poisson's ratio of the skin is 0.4, a detailed description of the relationship between the angle θ and the total deformation of the skin

, and deformation

skin in the vertical direction can be found in FIG. 4. As shown in FIG. 4, the relationship between the angle θ and the total deformation

skin can consist in the fact that the larger the angle θ, the greater the total deformation

skin and the louder the volume of the low-frequency part of the corresponding earphone based on bone conduction. As shown in FIG. 4, the relationship between the angle θ and the deformation of the skin in the vertical direction

may consist in the fact that the larger the angle θ, the smaller the deformation

skin in the vertical direction and the lower the volume of the high-frequency part of the corresponding bone conduction headphones.

кожи изменяется иначе, чем деформация

кожи в вертикальном направлении. Полная деформация кожи

увеличивается сначала быстрее, и затем ее увеличение замедляется, а деформация

кожи в вертикальном направлении уменьшается все быстрее и быстрее. Чтобы сбалансировать низкочастотную и высокочастотную громкость головных телефонов на основе костной проводимости, нужно подобрать подходящий диапазон угла θ. Например, θ может находиться в диапазоне от 5° до 80°, от 15° до 70°, от 25° до 50°, от 25° до 35°, от 25° до 30° и т.п.[0120] From the curve of equation (8) and FIG. 4, it can be seen that with an increase in the angle θ, the total deformation

skin changes differently than deformation

skin in a vertical direction. Complete deformity of the skin

increases faster at first, and then its increase slows down, and the deformation

skin in the vertical direction decreases faster and faster. In order to balance the low and high frequency loudness of bone conduction headphones, a suitable θ range must be selected. For example, θ may range from 5° to 80°, 15° to 70°, 25° to 50°, 25° to 35°, 25° to 30°, and the like.

[0121] In FIG. 5 is a diagram showing the frequency response curve of an exemplary bone conduction speaker according to some embodiments of the present invention. As shown in FIG. 5, the horizontal axis indicates vibration frequency, and the vertical axis indicates vibration intensity of the headset based on bone conduction. In some embodiments, in the frequency range of 500 to 6000 Hz, the flatter the frequency response curve, the higher the perceived sound quality of bone conduction headphones. The structure, part design, and material properties of bone conduction headphones can affect the frequency response curve. In general, low frequency refers to sounds with a frequency of less than 500 Hz, mid-frequency refers to sounds with a frequency in the range from 500 Hz to 4000 Hz, and high-frequency refers to sounds with a frequency greater than 4000 Hz. As shown in FIG. 5, the frequency response curve of bone conduction headphones may have two resonant peaks (510 and 520) in the low frequency range, a first high frequency valley 530, a first high frequency peak 540, and a second high frequency peak 550 in the high frequency range. Two resonant peaks (510 and 520) in the low frequency range can be generated by the combined action of the vibration transmission sheet and the headphone mount component. The first high frequency valley 530 and the first high frequency peak 540 may be generated by deformation of the body side at high frequency, and the second high frequency peak 550 may be generated by deformation of the body panel at high frequency.

[0122] The positions of the various resonant peaks and high frequency peaks/troughs can be related to the stiffness of the respective components. Rigidity generally refers to the degree of softness and hardness, as well as the ability of a material or structure to resist elastic deformation under the action of a force. Rigidity is related to the Young's modulus and the structural dimensions of the material itself. The greater the rigidity, the less the structure deforms under the action of a force. As mentioned above, the frequency response between 500 and 6000 Hz is especially critical for bone conduction headphones. In this frequency range, sharp peaks and valleys are not expected. The flatter the frequency response curve, the better the sound quality of the headphones. In some embodiments, the peak and trough of the high frequency range can be adjusted to a higher frequency range by adjusting the rigidity of the cabinet panel and the back of the cabinet.

[0123] In FIG. 6 is a diagram showing the low frequency portion of the frequency response curve of an exemplary bone conduction speaker at various angles θ according to some embodiments of the present invention. As shown in FIG. 6, the panel can contact with the skin and transmit vibration to the skin. In this process, the skin can also influence the vibration of the bone conduction speaker, which can affect the frequency response curve of the bone conduction speaker. From the above analysis, we find that the larger the angle, the greater the total deformation of the skin for the same excitatory force, and according to the bone conduction speaker, it is equivalent to the reduced elasticity of the skin relative to the panel. Further, it can be understood that when the line where the drive force of the drive device is located and the line normal to the area on the panel to contact or abut the user's body can form an angle θ. In particular, as the angle θ increases, the low-frequency resonance peak in the frequency response curve can be adjusted to the low-frequency range, whereby the low frequency sinks deeper and the low-frequency region increases. Compared with other technique for lifting the low-frequency portion of the sound, such as adding a vibration transmission sheet to the speaker based on bone conduction, setting the angle can effectively counteract the increase in vibration with the increase in low-frequency energy, thus reducing the relative perception of vibration, so that the low-frequency sensitivity of the speaker based on bone conduction is greatly improved, and the sound quality and human experience are improved. It should be noted that, in some embodiments, an increase in the low frequency range and a decrease in vibration can occur as the angle θ increases in the range from 0° to 90°, the energy in the low frequency range of the vibration or audio signal increases, and the perception of the vibration increases. However, the increase in energy in the low frequency range can exceed the increase in vibration, so the relative effect is relatively reduced.

[0124] From FIG. 6 shows that at a relatively large angle, a low-frequency resonant peak occurs in the low-frequency range, and the flat part of the frequency curve can expand, which improves the sound quality of headphones.

[0125] In FIG. 7 is a diagram showing the high frequency portion of the frequency response curve of an exemplary bone conduction speaker with different panel and cabinet materials, in accordance with some embodiments of the present invention. As shown in FIG. 7, with harder panel and cabinet materials, the frequencies corresponding to the first high frequency peak and the second high frequency peak increase. With softer panel and cabinet materials, the frequencies corresponding to the first high frequency peak and the second high frequency peak are reduced. For hard panel and cabinet materials, the frequency corresponding to the first high frequency valley is higher. For soft panel and body materials, the frequency corresponding to the first high frequency valley is lower than for hard panel and body materials. Obviously, stiffer (harder) panel and cabinet materials can increase the corresponding frequency value when high frequency peaks/troughs appear. As described in FIG. 5, it may be known that the frequency response of 1000 to 10000 Hz is particularly critical for bone conduction headphones. In this frequency range, sharp peaks and valleys are not expected. The flatter the frequency response curve, the better the sound quality of the headphones. Rigid (harder) panel and body materials in FIG. 7 can lengthen the flat part of the frequency curve, which improves the sound quality of headphones.

[0126] In some embodiments, the stiffness of various components (eg, housing, transmission component, driver, etc.) may be related to Young's modulus, thickness, size, and the like. materials. In the following, by way of example, the relationship between the rigidity of the hull and the material of the hull can be considered. In some embodiments, the case may include a case panel, a case back plate, and a case side. The housing panel, the rear housing panel, and the housing side may be made from the same material, or may be made from different materials. For example, the back panel of the housing and the panel of the housing may be made of the same material, and the side of the housing may be made of other materials. In some embodiments, under certain conditions, the greater the Young's modulus of the body material, the greater the rigidity of the body. The peak and trough of the headphone's frequency response curve can shift to the high frequency side, which is useful for adjusting the peak and trough from a high frequency to a higher frequency. In some embodiments, the Young's modulus of the body material can be adjusted to adjust the peak and trough of the frequency response curve to higher frequencies. In some embodiments, materials with a particular Young's modulus may be used. Young's modulus of the body can exceed 2000 MPa. Preferably, the Young's modulus of the body may exceed 4000 MPa. Preferably, the Young's modulus of the body may exceed 6000 MPa. Preferably, the Young's modulus of the body may exceed 8000 MPa. Preferably, the Young's modulus of the housing may exceed 12,000 MPa, and more preferably, the Young's modulus of the housing may exceed 15,000 MPa. More preferably, the Young's modulus of the housing may exceed 18,000 MPa.

[0127] In some embodiments, by adjusting the case stiffness, the frequency of the high-frequency peak-trough in the bone conduction headphone frequency response curve can be at least 1000 Hz. Preferably, the frequency of the high frequency peak-trough may be at least 2000 Hz. Preferably, the frequency of the high frequency peak-trough may be at least 4000 Hz. Preferably, the frequency of the high frequency peak-trough may be at least 6000 Hz. More preferably, the frequency of the high frequency peak-trough may be at least 8000 Hz. More preferably, the frequency of the high frequency peak-trough may be at least 10,000 Hz. More preferably, the frequency of the high frequency peak-trough may be at least 12,000 Hz. More preferably, the frequency of the high frequency peak-trough may be at least 14,000 Hz. More preferably, the frequency of the high frequency peak-trough may be at least 16,000 Hz. More preferably, the frequency of the high frequency peak-trough may be at least 18,000 Hz. More preferably, the frequency of the high frequency peak-trough may be at least 20,000 Hz. In some embodiments, by adjusting the body stiffness, the frequency of the high frequency peak-trough in the frequency response curve of bone conduction headphones can be outside the hearing range of the human ear. In some embodiments, by adjusting the rigidity of the housing, the frequency of the high frequency peak-trough in the headphone frequency response curve can be within the hearing range of the human ear. In some embodiments, if there are multiple high frequency peaks/troughs due to the housing stiffness adjustment, one or more high frequency peaks/troughs in the bone conduction headphone frequency response curve may be outside the hearing range of the human ear, and the remaining one or more high-frequency peak/trough frequencies may be within the hearing range of the human ear. For example, the second high frequency peak may be located outside the hearing range of the human ear, such that the first high frequency valley and the first high frequency peak are located within the hearing range of the human ear.

[0128] In some embodiments, increasing the rigidity of the chassis can be achieved by changing the connection mode of the chassis panel, chassis back panel, and chassis side to ensure that the entire chassis has increased rigidity. In some embodiments, the body panel, the rear body panel, and the body side may be formed as a whole. In some embodiments, the back panel of the case and the side of the case may be formed as a whole. The body panel and body side can be bonded directly with adhesive, or bonded by snapping or welding. The glue can be glue with strong viscosity and high hardness. In some embodiments, the body panel and body side may be integrally formed, and the body back panel and body side may be bonded directly with adhesive or fastened by snapping or welding. The glue can be glue with strong viscosity and high hardness. In some embodiments, the chassis panel, chassis back panel, and chassis side may be independent components. The three can be firmly connected by glue, snap or weld, etc. or any combination of them. For example, the body panel and body side may be joined with adhesive, and the body back panel and body side may be joined by snapping or welding. As another example, the back panel of the housing and the side of the housing may be joined with adhesive, and the panel of the housing and the side of the housing may be joined by snapping or welding.

[0129] In some embodiments, materials differing in Young's modulus may be used for matching to increase the overall rigidity of the hull. In some embodiments, the body panel, the back body panel, and the body side may be made from the same material. In some embodiments, the body panel, the back body panel, and the body side may be made from different materials, and the different materials may have the same Young's modulus or different Young's modulus. In some embodiments, the body panel and the rear body panel may be made from the same material, and the side of the case may be made from different materials. Young's moduli of two materials can be the same or different. For example, the Young's modulus of the case side material may be greater than that of the case panel and case back, or the Young's modulus of the case side material may be less than that of the case panel and case back. In some embodiments, the case panel and case side may be made from the same material, and the case back plate may be made from different materials. Young's moduli of two materials can be the same or different. For example, the Young's modulus of the case back panel material may be greater than that of the case panel and case side, or the Young's modulus of the case back panel material may be less than that of the case panel and case side. In some embodiments, the back panel of the case and the side of the case may be made of the same material, and the case panel may be made of other materials. Young's moduli of two materials can be the same or different. For example, the Young's modulus of the body panel material may be greater than that of the body back panel and body side, or the Young's modulus of the body panel material may be less than that of the body back panel and body side. In some embodiments, the body panel materials, the back panel of the body, and the side of the body may be different from each other. The Young's modulus of the three materials may be the same or different and exceed 2000 MPa.

[0130] In some embodiments, by adjusting the stiffness of the vibration transmission sheet and the headphone mount component, the two frequencies of the bone conduction headphone low frequency resonant peak can be less than 2000 Hz. Preferably, the two frequencies of the low frequency resonant peak of the bone conduction headset may be less than 1000 Hz. More preferably, the two frequencies of the low frequency resonant peak of the bone conduction headset may be less than 500 Hz.

[0131] In some embodiments, by adjusting the stiffness of each bone conduction-based headset component (e.g., housing, housing brace, vibration transfer sheet, or headset attachment component), peaks and valleys in the high frequency range can be adjusted to higher frequencies, and the low frequency resonant peak can be adjusted to lower frequencies to ensure the platform of the frequency response curve in the range of 1000Hz to 10000Hz, which enhances the sound quality of bone conduction headphones.

[0132] On the other hand, bone conduction headphones can lead to sound leakage during vibration transmission. Sound leakage refers to the vibration of the internal components of the headset based on bone conduction, or the vibration of the case may cause the volume of the surrounding air to change, resulting in the formation of a compression area or a rarefaction area in the ambient air, which propagate to the environment, resulting in sound transmission to the external environment. so that persons other than the wearer of the bone conduction headset can hear the sound from the headset. The present invention may provide a solution to reduce the leakage of bone conduction headphones by changing the structure or rigidity of the housing.

[0133] In some embodiments, sound leakage from a bone conduction speaker can be more effectively reduced by a properly designed vibration generation portion including a vibration transmission layer (not shown in the figures). Preferably, the mounting holes on the surface of the vibration transmission layer can reduce sound leakage. For example, the vibration transmission layer may be adhered to the panel, and the adhesive area on the vibration transmission layer may be more convex than the non-adhesive region on the vibration transmission layer. A cavity may be located under the glueless area. The non-adhesive area and the body surface on the vibration transmission layer may be respectively provided with sound input holes. Preferably, the adhesive-free area with part of the audio input holes may not be in contact with the user. On the one hand, the sound input holes can effectively reduce the area of the non-adhesive area on the vibration transmission layer, which allows the air inside and outside the vibration transmission layer to pass through, reduce the air pressure difference between the inside and the outside, and thus reduce the vibration of the non-adhesive area. On the other hand, the sound input holes may generate a sound wave generated by the vibration of the air inside the case, outside the case, and compensate for the leakage sound wave generated by the vibration of the case pushing the air outside the case, so that the amplitude of the leakage sound wave is reduced.

[0134] 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. In FIG. 8-16, the method of setting up the driving device and the panel is presented in terms of different embodiments.

Embodiment 1

[0135] In FIG. 8 is a diagram showing an axial sectional structure of an exemplary bone conduction speaker according to Embodiment 1 of the present invention. As shown in FIG. 8, in some embodiments, the bone conduction speaker 800 may include a panel 801, a housing 802, a first transmission component 803, a coil 804, a vibration transmission sheet 805, and a magnet system 806. The panel 801 and housing 802 may form a closed or quasi-closed cavity, and the cavity may house a drive device including a first transmission component 803, a coil 804, a vibration transmission sheet 805, and a magnet system 806.

[0136] In some embodiments, both coil 804 and magnet system 806 may have ring structures. In some embodiments, coil 804 and magnet system 806 may have parallel axes to each other. The axis of the driver may be the axis of the coil 804 and/or the magnet system 806. The axis of the driver and the line normal to the area on the panel to contact or abut the user's body may form an angle θ, and 0° < θ < 90°. In particular, the axis of the driving device and the normal line to the area on the panel for contact with the user's body or adjacent to it can form an angle θ. Additional descriptions regarding the axis of the coil 804 or magnet system 806 and its spatial relationship with the normal line can be found elsewhere in this application (see, for example, Fig. 3 and its description).

[0137] In some embodiments, a portion of the first transfer component 803 may have an annular structure adapted to the structure of the coil 804. The annular structure may be mechanically connected to one end surface of the coil 804, and another portion of the first transfer component 803 may be a connecting rod mechanically connected with panel and/or housing. The coil 804 may be wholly or partially located within the magnetic gap of the magnet system 806. The coil 804 may be wholly or partially located within the annular groove of the magnet system 806. In some embodiments, the annular end surface of the magnet system 806 may be mechanically connected to the outer edge of the vibration transmission sheet 805. The first transmission component 803 can pass through the middle region of the vibration transmission sheet 805 and be firmly connected thereto.

[0138] After applying electric current, the coil 804 can generate an ampere force and a vibration in a magnetic field that is generated by the magnetic system 806, and transmit the vibration of the coil 804 to the panel 801 through the first transmission component 803. The vibration generated by the reaction force sensed by the magnetic system 806 can be directly transmitted to the first transmission component 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 can be transmitted to the skin and bones of the human body through the panel 801 so that people can hear the sound. It can be understood that since the vibration transmission sheet is directly connected to the magnet system 806 and the first transmission component 803, the vibration generated by the magnet system 806 can be directly transmitted to the panel through the first transmission component 803. Additionally, the vibration generated by the coil 804 and the vibration generated by the magnetic system 806 can form a composite vibration to be transmitted to the panel 801, and then the composite vibration can be transmitted to the skin and bones of the human body through the panel 801, whereby people can hear sound based on bone conduction.

Embodiment 2

[0139] FIG. 9A is a diagram showing an axial sectional structure of an exemplary bone conduction speaker according to Embodiment 2 of the present invention. The bone conduction speaker 900a may include a panel 901, a cabinet 902, a first transmission component 903, a coil 904, a vibration transmission sheet 905, a second transmission component 906, and a magnetic system 907. The first transmission component 903 may be a hollow cylinder, one end surface the first transfer component 903 may be mechanically coupled to the panel 901, and the other end surface of the first transfer component 903 may be mechanically coupled to one end of the coil 904. The coil 904 may be wholly or partially located in the annular groove or magnetic gap of the magnetic system 907. It should be understood that and coil 904 and magnet system 907 may have ring structures. In some embodiments, coil 904 and magnet system 907 may have parallel axes to each other. Additional descriptions regarding the axis of the coil 904 or magnet system 907 and its spatial relationship with the normal line of the area on the panel for contact with the body of the user or adjacent to it can be found elsewhere in this application (see, for example, Fig. 3 and its description ). The center or region near the center of the magnetic system 907 may be mechanically connected to one end of the second transmission component 906, and the other end of the second transmission component 906 may be mechanically connected to the central region or region near the center of the vibration transmission sheet 905. The outer edge of the vibration transmission sheet 905 can be mechanically connected to the inner side of the flange of the first transmission component 903. The bonding method may include, but is not limited to, clamp bonding, hot pressing bonding, adhesive bonding, injection molding bonding, and the like.

[0140] In this embodiment, after applying electric current, the coil 904 can generate an ampere force and vibration in a magnetic field generated by the magnetic system 907, and transmit the vibration of the coil 904 to the panel 901 through the first transmission component 903. The vibration generated by the reaction force sensed by the magnet system 907 can be transmitted to the panel 901 via the second transmission component 906, the vibration transmission sheet 905, and the first transmission component 903. The vibration of the coil 904 and the vibration of the magnet system 907 can be transmitted to the skin and bones of the human body through the panel 901, whereby people can hear the sound. In short, the vibration generated by the coil 904 and the vibration generated by the magnet system 907 can form a composite vibration to be transmitted to the panel 901, and then the composite vibration can be transmitted to the skin and bones of the human body through the panel 901, whereby people can hear sound on basis of bone conduction.

[0141] The embodiment shown in FIG. 9A may differ from that shown in FIG. 8. As shown in FIG. 9A, the first transmission component can be changed from a connecting rod to a hollow cylindrical structure, whereby the combination of the first transmission component and the coil can be more sufficient and the structure can be more stable. At the same time, the frequency of higher order modes (i.e., vibration at different points on the speaker is not consistent) of the speaker may increase, and the low-frequency resonant peak of the bone conduction speaker's frequency response curve may move to a lower frequency, resulting in a flat portion of the frequency response curve. characteristics can be enhanced and the sound quality of the speaker can be improved.

[0142] In FIG. 9B is a diagram showing an exploded structure of an exemplary bone conduction speaker according to Embodiment 2 of the present invention. In FIG. 9C is a diagram showing the longitudinal section structure of the exemplary bone conduction speaker in FIG. 9B according to some embodiments of the present invention. The bone conduction speaker structure shown in FIG. 9B and FIG. 9C may correspond to that shown in FIG. 9A.

[0143] As shown in FIG. 9B, the bone conduction speaker 900b may include a vibration plate and face silicone component 910, a vibration transmission bracket and sheet 911, a coil 912, a connection component 913, a bolt and nut assembly 914, an upper magnet 915, a magnetically conductive plate 916, a lower magnet 917, conductive cap 918, multifunction key PCB 919, multifunction button silicone 920, speaker housing 921, earhook multifunction button 922, and earhook 923. As shown in FIG. 9C, the vibration plate and face silicone component 910 may further include face silicone 9101 and vibration plate 9102. The bracket and vibration transmission sheet 911 may further include a bracket 9111 and 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 aforementioned panel, and the face silicone 9101 may be equivalent to a soft material covering the panel. It can be understood that 9101 face silicone is not always an essential part. In some embodiments, the face silicone 9101 may be omitted. The bracket 9111 may correspond to the aforementioned first transmission component. The connecting component 913 may correspond to the aforementioned second transmission component. The speaker case 921 may be equivalent to the above case.

[0144] As shown in FIG. 9C, the vibration plate and the face silicone component 910 may be combined with the speaker housing 921 to form an enclosed or quasi-enclosed cavity for housing the magnet system, transmission component, and other components. The magnetically conductive cover 918 may have a concave structure and specifically include a bottom plate and a side wall. The top magnet 915, the conductive plate 916, and the bottom magnet 917 may be stacked on the bottom plate of the conductive cover 918 from top to bottom. The upper magnet 915, the magnetic conductive plate 916, the lower magnet 917, and the magnetic conductive cover 918 may be respectively provided with through holes and assembled with each other by a bolt and nut assembly 914 to form a magnet system. 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, a magnetic gap may be formed. Coil 912 may be partly or completely located within the magnetic gap. As shown in FIG. 9D and FIG. 9E, the staple 9111 may have an annular structure of variable thickness. In particular, one side may be thicker than the other side. One end surface of the brace 9111 may be dimensionally compatible with the coil 912 and mechanically engage with one end surface of the coil 912, and the other end of the brace 9111 may mate or be mechanically coupled to the vibration plate and face silicone component 910. The structure of the 9111 bracket, where one side is thicker than the other side, can tilt the driver relative to the vibrating plate and face silicone component 910, thus ensuring that the axis of the driver (or the direction of the driving force) and the normal line to the contact surface (surface in contact with human skin) of the face silicone component 910 has an angle θ. The connecting component 913 can connect the top magnet 915 of the magnet system to the vibration transmission sheet 9112, and simultaneously perform a vibration transmission function. A specific connection method may include, but is not limited to, a bolted connection, an adhesive connection, a welded connection, and the like. The edge of the vibration transmission sheet 9112 can snap into the inside of the bracket 9111. The bracket 9111 can also have the function of transmitting the coil vibration and the vibration of the magnetic system to the vibration plate and face silicone component 910. The outer edge of the bracket can be snapped into a groove or a restrictive slot on the inner wall of the speaker case 921, and then fixed in the cavity, whereby, while transmitting, the bracket can also become a suspension or support for the entire driving device.

[0145] In FIG. 9D and 9E are diagrams showing brace structures in illustrative bone conduction dynamics according to some embodiments of the present invention. As shown in FIG. 9D and 9E, by way of example only, the staple 9111 may have an annular body 91111. The body may be an annular sheet structure, and an annular face 91112 adapted to the shape of the body may be provided on the body. One side of face 91112 may be lower than the other side (eg, face A side is lower than face B side). The transition between the high side and the low side can be via connecting sections C and D with continuously varying heights or jumping heights. For example, connecting sections C and D are made in a stepped design with discontinuous changes in height. It should be noted that side A, side B, connection part C and connection part D can be considered as four different parts of the front surface 91112, which can be formed integrally with each other without an obvious boundary in the structure. Side A, side B, connecting section C and connecting section D can also be structurally independent of each other and assembled together in an additional way of connection. A particular connection method may include, but is not limited to, adhesive bonding, welding bonding, hot melt bonding, and the like. A brace 9111 can be used to connect the coil to the vibration plate and face silicone component 910 to effect vibration transmission. In particular, the bottom end surface of the brace body 91111 can be firmly connected to the top surface of the coil, and the top side of the face 91112 can be mated or mechanically connected to the vibration plate and the face silicone component 910 (see FIG. 9C). In some embodiments, the distance between the vibrating plate and the face silicone component 910 and the driving device (eg, coil) may be relatively large, whereby the height of the face may be large. The thin face of the 91112 can be fragile and easily damaged, but if the face of the 91112 is thick and heavy, sound transmission and quality will suffer. In some embodiments, several stiffeners 91113 may be provided outside or inside the face 91112 to ensure the strength of the face 91112 without sacrificing sound quality. In some embodiments, the stiffener 91113 may be a small face perpendicular to the face 91112, one end surface of which can be mechanically connected to the body 91111, and the other end surface can be mechanically connected to the front surface 91112. The connection method may include, but not limited to, adhesive bonding, welding bonding, thermoplastic molding, integral molding, and the like. In some embodiments, the stiffener 91113 may also be a short post. The stance can be diagonally supported between the front surface and the body. One end of the post may be mechanically connected to the body 91111, and the other end may be mechanically connected to the face 91112. The connection method may include, but is not limited to, adhesive bonding, welding bonding, thermoplastic molding, integral molding, and the like.

Embodiment 3

[0146] In FIG. 10 is a diagram showing an axial sectional structure of an exemplary bone conduction speaker according to Embodiment 3 of the present invention. Compared to the bone conduction speaker 900, the difference between the bone conduction speaker 1000 may be the installation position and the length of the first transmission component 1003. The first transmission component 1003 may include a plurality of connecting rods or connecting posts. One end of a part of the connecting rods can be mechanically connected to the panel 1001. One end of the other part of the connecting rods can be mechanically connected to the first side 1002 of the body, and the other end of each connecting rod can be mechanically connected to one end surface of the coil 1004. Thus, each connecting rod can be distributed between the spool and the panel and/or housing along the spool 1004, and the connecting rods may be distributed at equal intervals or may be distributed at different intervals. As a variant of this embodiment, the first transmission component 1003 can also be designed as a hollow cylinder like the first transmission component 903, and its cross section can be adapted to the size and shape of the coil. The first end surface of the first transfer component 1003 may be mechanically connected to one end of the coil, a portion of the second end surface of the first transmission component 1003 may be mechanically connected to the panel 1001, and another portion may be mechanically connected to the housing 1002.

[0147] Compared to the bone conduction speaker 900, the length of the first transmission component 1003 in the bone conduction speaker 1000 may be shorter, which may further increase the frequency at which the speaker generates higher order modes (i.e., vibrations in different points of the dynamics are not consistent).

Embodiment 4

[0148] In FIG. 11 is a diagram showing an axial sectional structure of an exemplary bone conduction speaker according to Embodiment 4 of the present invention. As shown in FIG. 11, a bone conduction speaker 1100 may include a driver 1101, a transmission component 1102, a panel 1103, and a housing 1105. The transmission component 1102 may include structures such as a vibration transmission sheet, a connecting rod, and a connecting brace. The transmission component 1102 may be mechanically coupled to the driver 1101 and the panel 1103 as a transmission path to transmit the vibration or driving force generated by the driver 1101 to the panel 1103. In some embodiments, the distance between the panel and the driver is relatively large, the length of the transmission path should be big. In addition, an increased length of the transmission component may also be required. For example, an increased length of the connecting rod or connecting strut may be required. If the structure of the transmission component is thin, the force may be relatively small, and long-term vibration may cause damage. If the structure of the transmission component is set more and more thick to solve the problem, it may also affect the vibration transmission and therefore affect the sound quality. In some embodiments, an additional stiffener 1104 may be provided on the surface of the transmission component to increase the strength of the transmission component and have little effect on the structure of the transmission component. In some embodiments, stiffener 1104 may include a face, ridge, post, and the like. Connection methods between stiffener 1104 and transmission component 1102 may include, but are not limited to, adhesive bonding, welding bonding, thermoplastic molding, integral molding, and the like. In some embodiments, some of the stiffener 1104 may be provided on the surface of the transmission component. For annular transmission components, the stiffeners may be distributed at equal or unequal intervals around the periphery of the transmission component. Additional descriptions regarding the stiffener can be found elsewhere in this application (see, for example, Fig. 9D and Fig. 9E and their description).

[0149] Compared to other embodiments, the bone conduction speaker 1100 shown in FIG. 11 may have a stiffener 1104 added to the transmission component. By increasing the strength of the transmission component, this can increase the frequency at which the speaker generates higher order modes (i.e. vibrations at different points in the speaker are not consistent), which can improve the sound.

Embodiment 5

[0150] In FIG. 12 is a diagram showing an axial sectional structure of an exemplary bone conduction speaker according to Embodiment 5 of the present invention. As shown in FIG. 12, in some embodiments, one end of the first transmission component 1203 of the bone conduction speaker 1200 can be mechanically coupled to the bottom surface of the housing 1202, i.e., the entire drive device can be tilted and attached to the housing 1202 relative to the panel.

[0151] In particular, both the body 1202 and the panel 1201 may have a high hardness, and they may both be integrally formed or connected through a bonding medium with relatively high rigidity. After the electric current is applied, the vibration generated by the coil 1204 and the vibration generated by the magnet system 1207 can form a composite vibration to be transmitted to the body 1202 and then to the panel 1201. The composite vibration can be transmitted to the skin and bones of the human body through the panel 1201, whereby humans can hear sounds through bone conduction.

Embodiment 6

[0152] In FIG. 13 is a diagram showing an axial sectional structure of an exemplary bone conduction speaker according to Embodiment 6 of the present invention. As shown in FIG. 13, in some embodiments, a bone conduction speaker 1300 may include a housing 1302, a panel 1301 provided independently of the housing, and a driver. The driver may include a first transmission component 1303, a coil 1304, a vibration transmission sheet 1305, a second transmission component 1306, and a magnetic system 1307. The housing 1302 may include a first housing 13021 and a third transmission component 13022. The first body 13021 may be a cuboid having a cavity. In some embodiments, the first body 13021 may be a closed cylinder, a sphere having a cavity, or the like. The driving device may be located in the cavity, the internal structure of the driving device may be any of the above embodiments.

[0153] The top side of the first body 13021 can be mechanically connected to the top side of the panel 1301 through the third transmission component 13022, and the bottom side of the first body 13021 can be directly connected to the bottom side of the panel 1301. The connection method between the first body 13021 and the panel 1301 may not be limited to the above way. For example, the underside of the first body 13021 may be mechanically connected to the underside of the panel 1301 via the third transfer component 13022, and the top side of the first body 13021 may be directly connected to the top side of the panel 1301. As another example, only the middle region of the first body 13021 may be mechanically connected with the panel through the third transmission component. The third transmission component may be of a bar, plate, or hollow column structure.

[0154] In this embodiment, after the electric current is applied, the coil 1304 can 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 component 1303. The first housing 13021 can transmit vibration to the panel 1301 through the third transmission component 13022 or directly. The vibration generated by the reaction force sensed by the magnetic system 1307 can be transmitted to the first housing 13021 through the connection between the second transmission component 1306 and the vibration transmission sheet 1305. The first housing 13021 can transmit vibration to the panel 1301 through the third transmission component 13022 or directly. The vibration of the coil 1304 and the vibration of the magnet system 1307 can be transmitted to the skin and bones of the human body through the panel 1301, whereby people can hear sounds. In short, the vibration generated by the coil 1304 and the vibration generated by the magnet system 1307 can form a composite vibration to be first transmitted to the first housing 13021 and then transmitted to the panel 1301 directly or via the third transmission component 13022. The composite vibration can be transmitted to the skin and bones of the human body through the panel 1301, whereby people can hear sound based on bone conduction.

Embodiment 7

[0155] In FIG. 14 is a diagram showing an axial sectional structure of an exemplary bone conduction speaker according to Embodiment 7 of the present invention. As shown in FIG. 14, the bone conduction speaker 1400 may have the first transmission path and the second transmission path independent of each other. In particular, the first transmission path may include a first transmission component 1403. The transmission component on the second transmission path may include a vibration transmission sheet 1405 and a second transmission component 1406. Having a first transmission path and a second transmission path independent of each other in bone conduction dynamics 1400 may mean that there is no common transmission component in the two transmission paths.

[0156] As shown in FIG. 14, the bone conduction speaker 1400 may include a panel 1401, a housing 1402, a first transmission component 1403, a coil 1404, a vibration transmission sheet 1405, a second transmission component 1406, and a magnet system 1407. The panel 1401 and housing 1402 may form a closed or quasi-closed cavity, and a driver including a first transmission component 1403, a coil 1404, a vibration transmission sheet 1405, a second transmission component 1406, and a magnetic system 1407 may be located in the cavity. or abutments to it can form an angle θ, and 0° < θ < 90°. The bottom surface of the magnetic system 1407 may be mechanically connected to the vibration transmission sheet 1405 through the second transmission component 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 the side of the housing 1402, or one part may be mechanically connected to the bottom of the housing 1402 and the other part may be mechanically connected to the side of the housing 1402.

[0157] In this embodiment, after applying electric current, the coil 1404 can generate an ampere force and vibration in a magnetic field generated by the magnetic system 1407, and transmit the vibration of the coil 1404 to the panel 1401 through the first transmission component 1403. The vibration generated by the reaction force sensed by the magnetic system 1407 may be transmitted to the bottom and side of the housing 1402 through the second transmission component 1406 and 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 can be transmitted to the skin and bones of the human body through the 1401 panel, allowing people to hear sounds. It can be understood that since the vibration transmission sheet is directly connected to the body 1402, the magnet system and the body 1402 can be softly connected. The vibration generated by the magnetic system 1407 can be directly transmitted to the bottom surface 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 can form a composite vibration to be transmitted to the panel 1401. When the composite vibration is transmitted skin and bones of the human body through the panel 1401, people can hear the sound based on bone conduction.

Embodiment 8

[0158] In FIG. 15 is a diagram showing an axial sectional structure of an exemplary bone conduction speaker according to Embodiment 8 of the present invention. The bone conduction speaker 1500 shown in FIG. 15 may include a vibration transmission double sheet structure. The low frequency range of the speaker's vibration response curve may have an additional peak, which may make the speaker's response more sensitive at low frequencies, thus improving sound quality. In particular, as shown in FIG. 15, the bone conduction speaker 1500 may include a panel 1501, a cabinet 1502, a first transmission component 1503, a coil 1504, a first vibration transmission sheet 1505, a second vibration transmission sheet 1506, a second transmission component 1507, and a magnetic system 1508. the panel 1501, the first transmission component 1507, the first vibration transmission sheet 1505, the second transmission component 1507, and the magnet system 1508 may be identical to that shown in FIG. 9. The edge of the second vibration transmission sheet 1506 can be mechanically connected to the open end surface of the housing 1502. The first transmission component 1503 can pass through the middle region of the second vibration transmission sheet 1506 and be firmly connected thereto. The central axis surface of the second vibration transmission sheet 1506 can be snapped onto the solid cylindrical body of the first transmission component 1503.

[0159] The operation principle of the bone conduction speaker 1500 in this embodiment is set forth in the following description. After applying electric current, the coil 1504 can generate an ampere force and vibration in the magnetic field generated by the magnetic system 1508, and transmit the vibration of the coil 1504 directly to the panel 1501 through the first transmission component 1503. The vibration generated by the reaction force sensed by the magnetic system 1508 can be transmitted to the panel 1501 via the second transmission component 1507 and the first vibration transmission sheet 1505. The vibration of the housing 1502 may be transmitted to the panel 1501 via the second vibration plate. Then, the vibration of the coil 1504 and the vibration of the magnet system 1508 can be transmitted to the skin and bones of the human body through the panel 1501, whereby people can hear the sound. It can be understood that the soft connection between the panel 1501 and the housing 1502 may be through the second vibration transmission sheet 1506. The vibration generated by the coil 1504 and the vibration generated by the magnetic system 1508 can form a composite vibration to be transmitted to the panel 1501 and the body 1502. Then, the composite vibration can be transmitted to the skin and bones of the human body through the panel 1501 so that people can hear the sound based on bone conduction.

Embodiment 9

[0160] In FIG. 16 is a diagram showing an axial section structure of an exemplary bone conduction speaker according to Embodiment 9 of the present invention. 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 housing 1602 may form a closed or quasi-closed cavity, and two drivers 1605 and 1606 may be located within the cavity. The driving device in this embodiment may be the driving device in the above embodiments of the present invention. The driving device 1605 may be mechanically coupled to the panel 1601 via the first transmission component 1603. The driving device 1606 may be mechanically connected to the site provided in the cavity through the second transmission component 1604. An angle may be formed between driver 1605 and driver 1606. In some embodiments, driver 1606 may be directly coupled to a panel or housing via a second right-angled transmission component 1604. It should be noted that in some embodiments, the driver axis 1605 may not be parallel to the panel normal line, and driver axis 1606 may not be perpendicular to the panel normal line. The position of the two drivers relative to the panel may be such that the straight line of the received direction of the driving force generated by the two drivers and the line normal to the area on the panel to contact or abut the user's body can form an angle θ, and 0° < θ < 90°. Additionally, it can be understood that the number of drivers can also be 3, 4, or even more. By adjusting the position of each driver in the cavity, the straight line of the obtained direction of the driving force generated by each driver and the line normal to the area on the panel to contact or abut the user's body can form an angle θ, and 0° < θ < 90°.

[0161] In this embodiment, the driving force of the driving device 1605 may be parallel to a line normal to an area on the panel to contact or abut the user's body. The drive force of the driver 1606 may be perpendicular to a line normal to an area on the panel to contact or abut the user's body. Two drivers can vibrate at the same time, and two kinds of vibrations can be transmitted to the panel, and then the composite vibration can be transmitted to the skin and bones of the human body through the panel 1601, so that people can hear the sound based on bone conduction.

[0162] The present invention also provides bone conduction headphones. During operation, the headphone holder/headphone mount can fix the speaker based on bone conduction to a particular part of the user (eg, the head) and provide a clamping force between the vibrating unit and the user. The contact surface may be connected to the driver and maintain contact with the user to transmit sound to the user through vibration. If the bone conduction speaker has a symmetrical structure, and based on the fact that the driving forces provided by the two driving devices on both sides are equal in magnitude and opposite in direction, the center point of the headset holder/headphone mount can be selected as the equivalent fixed end . If the bone conduction speaker can provide stereo sound, that is, the instantaneous driving forces provided by the two transducer devices are different in magnitude, or the bone conduction speaker has an asymmetric structure, other points or areas on or outside of the headset support/headphone mount can be chosen as equivalent pinned ends. As used herein, the term "fixed end" can be considered an equivalent end where the position of the bone conduction speaker is relatively constant during vibration generation. The fixed end and the vibrating unit may be connected via the headset holder/headphone mount, and the transmission ratio may be related to the headset holder/headphone mount and the clamping force provided by the headset holder/headphone mount, which may depend on physical properties headphone holder/headphone mount. Preferably, changing the physical properties, for example, the clamping force provided by the headset support/headphone mount, the quality of the headset support/headphone mount, etc., can change the sound transmission efficiency of the speaker based on bone conduction, which affects the frequency response. systems in a specific frequency range. For example, a headset holder/headphone mount made of a high strength material and a headset holder/headphone mount made of a less durable material may provide different clamping forces, or a change in the structure of the headset holder/headphone mount for example, adding an accessory that can bounce the headphone holder/headphone mount can also change the clamping force, which affects the sound transmission efficiency. Changes in headphone holder/headphone mount size while wearing can also affect the amount of clamping force. The clamping force can increase with the distance between the vibrating blocks at both ends of the headset holder/headphone mount.

[0163] In order to obtain a headset holder/headphone mount that meets specific clamping force conditions, those skilled in the art may select materials differing in stiffness and modulus of elasticity for making the headphone mounts/headphone mounts or adjusting the size of the headphone mounts /headphone mounts. It should be noted that the clamping force of the headphone holder/headphone mount can affect not only the sound transmission efficiency, but also the user's perception of sound in the low frequency range. The clamping force referred to herein may be the pressure between the contact surface and the user. Preferably, the clamping force may be in the range of 0.1 N to 5 N. More preferably, the clamping force may be in the range of 0.2 N to 4 N. More preferably, the clamping force may be in the range of 0.2 N to 3 N. More preferably, the clamping force may be in the range of 0.2 N to 1.5 N, and more preferably, the clamping force may be in the range of 0.3 N to 1.5 N.

[0164] It should be noted that the above embodiments of a bone conduction speaker may be illustrative only, and the components and structures described in these embodiments should not be construed as limiting the present invention. Components, shapes, structures, and connection methods in these embodiments may be combined. For example, the stiffener in FIG. 11 may apply to any of the embodiments shown in FIG. 9-16. The first transmission component 903 of the bone conduction speaker 900a in FIG. 9 can also be connected simultaneously to the panel and the body as the first transmission component 1003 of the bone conduction speaker 1000, and can also be connected to the back of the case, as in the bone conduction speaker 1200.

[0165] FIG. 17 is a flowchart illustrating a method for establishing a bone conduction based speaker in accordance with some embodiments of the present invention. Method 1700 may comprise the steps of establishing a bone conduction based speaker, in accordance with a particular embodiment of the present invention.

[0166] At 1710, the panel and driver may be connected. In some embodiments, a transmission component, such as a vibration transmission sheet and a connecting component, may be used to connect the driver to the panel. In addition to the structural connection, the transmission component may also be involved in vibration transmission. In particular, the drive device may include a coil and a magnet system. The vibration of the coil and magnet system can be transmitted to the panel and/or housing in different ways. For example, the vibration of the coil may be transmitted to the panel and/or housing through the first transmission path, and the vibration of the magnetic system may be transmitted to the panel and/or housing through the second transmission path. The first transmission path may include a first transmission component. The second transmission path may include a second transmission component, a vibration transmission sheet, and a first transmission component. The first transmission component may be a connecting prop or a connecting rod. The second transmission component may be a connecting prop or a connecting rod.

[0167] In some embodiments, the bone conduction speaker can transmit the vibration generated by the driver to the panel by connecting the driver component of the panel and the driver, thereby further transmitting the vibration to the human body through the panel attached to the human body. The transmission connection between the panel and the driving device can effectively carry the vibration signal generated by the driving device, so that the human body can receive the signal. In some embodiments, panels, transmission components, and drivers are generally rigid materials and are rigidly connected to each other to improve the quality of the transmitted audio signal.

[0168] At step 1720, the relative position of the driver and the panel can be set such that the line along which the driving force generated by the driver is oriented is not parallel to the line normal to the panel. In particular, the relative positions of the driver and the panel may be set according to the various embodiments above. The applied establishment method may include changing the structure of the transmission component. For example, setting a transmission component on a structure where one side is lower than the other to ensure that the straight line along which the drive force is oriented is not parallel to the normal line to the panel. The mounting method used may also include lifting the panel or body structure to achieve a technical goal. For example, a platform inclined relative to the panel may be mounted in the housing, and a driving device may be mounted on the platform. As another example, the driving device may be mounted horizontally in the housing and the panel may be tilted to cover the housing. As long as the driving device can be tilted relative to the panel such that the straight line along which the driving force is oriented is not parallel to the normal line of the area on the panel to contact or abut the user's body, any method can be applied to the present invention, and the present invention is not limited thereto.

[0169] It should be noted that there is no necessary sequence of the two stages of bone conduction speaker establishment. The two steps can be performed in reverse order. In some embodiments, the two steps may not be completely separate processes, that is, the two steps may be performed simultaneously. For example, when connecting an exciter to a panel, the relative positional relationship between them is adjusted.

[0170] Based on the foregoing general principles, those skilled in the art may understand from this detailed description that the foregoing detailed description is for presentational purposes only by way of example and not limitation. Various changes, improvements and modifications may occur and are addressed to those skilled in the art, although not explicitly indicated here. These changes, improvements and modifications are suggested in this specification and fall within the spirit and scope of the illustrative embodiments of this invention.

[0171] In addition, certain terms have been used to describe embodiments of the present invention. For example, the terms “one embodiment”, “an embodiment”, and/or “some embodiments” mean that a particular feature, structure, or characteristic described in connection with an embodiment is included in at least one embodiment of the present invention. Therefore, it is emphasized and understood that two or more references to "an embodiment" or "one embodiment" or "alternative embodiment" in various parts of this specification do not necessarily all refer to the same embodiment. In addition, specific features, structures, or characteristics may be combined as appropriate in one or more embodiments of the present invention.

[0172] Additionally, one of skill in the art will appreciate that aspects of the present invention may be illustrated and described herein in any of several patentable classes or contexts, including any novel and useful process, apparatus, article, or composition, or any novel and useful improvements. Accordingly, aspects of the present invention may be implemented entirely in hardware, entirely in software (including firmware, resident software, microcode, etc.), or a combination of software and hardware, which may all be collectively referred to as here “block”, “module” or “system”. In addition, aspects of the present invention may take the form of a computer program product embodied in one or more computer readable media embodied in computer readable program code.

[0173] In addition, unless expressly stated in the claims, the mentioned elements or sequences of the order of processing, the use of numbers, letters or other designations in this application are not intended to limit the order of the processes and methods of the present invention. Although the foregoing disclosure has discussed various examples of what are currently considered to be various useful embodiments of the invention, it should be understood that such details serve only that purpose, and that the following claims are not limited to the disclosed embodiments, but rather are intended to cover modifications. and equivalent configurations that fall within the spirit and scope of the disclosed embodiments. For example, while the implementation of the various components described above may be implemented in hardware, it may also be implemented as a pure software solution, such as installation on an existing server or mobile device.

[0174] Likewise, it is apparent that in the above description of embodiments of the present invention, various features are sometimes grouped together in a single embodiment, figure, or description thereof in order to optimize the disclosure for a better understanding of one or more of the various embodiments of the invention. However, this mode of invention should not be interpreted as reflecting the intent that the claimed subject matter requires more features than are explicitly stated in each claim. On the contrary, embodiments of the invention are not contained in all features of the single embodiment disclosed above.

[0175] In some embodiments, numbers expressing quantities or properties used to describe and establish certain embodiments of the application should be considered as being modified in some cases by the term “about”, “approximately”, or “substantially”. For example, “about”, “approximately”, or “substantially” may indicate an error of ±1%, ±5%, ±10%, or ±20% of the described value, unless otherwise indicated. Accordingly, in some embodiments, the numerical parameters set forth in the written description and the following claims are approximations that may vary depending on the properties desired in a particular embodiment. In some embodiments, the numerical parameters should be considered in light of the number of significant digits reported and by applying conventional rounding techniques. Although the numerical ranges and parameters found in the broad scope of some embodiments of the application are approximations, the numerical values set forth in the specific examples are reported as accurately as possible from a practical point of view.

[0176] In conclusion, it should be understood that the embodiments of the invention disclosed herein are illustrative of the principles of the embodiments of the invention. Other modifications that may be used may be within the scope of the invention. Thus, by way of example, and not limitation, alternative configurations of embodiments of the application may be used in accordance with the principles set forth here. Accordingly, embodiments of the present invention are not specifically limited to those shown and described.

Claims (18)

1. A bone conduction speaker comprising a panel and at least two driving devices, wherein: the panel is connected with the possibility of transmission with each of the two exciting devices; all or part of the panel is configured to contact or abut the user's body to conduct sound; an area where a panel contacting or adjacent to the user's body has a normal line; said at least two drivers include a first driver and a second driver, the axis of the first driver is parallel to the normal line, the axis of the second driver is perpendicular to the normal line; and each of at least two exciters contains a coil and a magnetic system, the axis of the exciter is perpendicular to the radial plane of the coil and/or the radial plane of the magnetic system. 2. The bone conduction speaker of claim 1, wherein the region where the panel contacting or adjacent to the user's body is a plane. 3. The bone conduction speaker according to claim 1, wherein the region where the panel in contact with or adjacent to the user's body is a quasi-plane; and the area normal line is the average area normal line, wherein the quasi-plane is a plane for which the angle between the normal line at any point in at least 50% of the plane and the averaged normal line is less than a predetermined threshold. 4. The bone conduction speaker of claim 3, wherein the predetermined threshold is 10°. 5. The bone conduction speaker of claim 1, wherein the straight line of the resultant direction of the driving force generated by said at least two driving devices and said area normal line form an angle

, and the angle

is an acute angle. 6. The bone conduction speaker according to claim 1 or 5, wherein the bone conduction speaker further comprises a housing, the housing being connected to the panel by a connecting medium, or the housing and the panel are integrally formed. 7. The bone conduction speaker of claim 6, wherein the coil of one of the at least two drivers is connected to the panel or housing via a transmission component. 8. The bone conduction speaker of claim 7, wherein a stiffener is provided on the transmission component, the stiffener being a front surface or support bar. 9. The bone conduction speaker of claim 7, wherein one side of the transmission component is shorter than the other side of said transmission component. 10. The bone conduction speaker of claim 7, wherein the transmission component is a hollow cylinder, one end surface of the hollow cylinder is connected to one end surface of the coil, the other end surface of the hollow cylinder is connected to a panel or housing, or the transmission component is a group of connecting rods, one end of each connecting rod is connected to one end surface of the coil, the other end of each connecting rod is connected to the panel and/or housing, each connecting rod is distributed in a circle around the coil.

Images