Bone conduction loudspeaker and earphone

Abstract

The invention discloses a bone conduction loudspeaker and an earphone. The bone conduction loudspeaker comprises a panel and a driving device, the panel is in transmission connection with the driving device; the whole or part of the panel is used for being in contact with or abutting against the body of a user so as to conduct sound; the area, used for making contact with or abutting against the body of a user, of the panel is provided with a normal. The axis of the driving device is not parallel to the normal; the driving device comprises a coil and a magnetic circuit system, and the axis of the driving device is perpendicular to the radial plane of the coil and / or the radial plane of the magnetic circuit system.

Description

Priority declaration

[0001] The present invention claims the priority of Chinese application No. 201810623408.2 filed on June 15, 2018. Technical Field

[0002] The invention relates to a speaker, and in particular to a method for improving the sound quality of a bone conduction speaker or a bone conduction earphone. Background Art

[0003] Generally speaking, people can hear sounds because air transmits vibrations to the eardrum through the external ear canal. The vibrations formed by the eardrum drive the auditory nerve, thereby perceiving the vibrations of the sound. When a bone conduction speaker is working, it can usually transmit sound to the auditory nerve through the skin, subcutaneous tissue and bones, allowing people to hear the sound. Summary of the invention

[0004] One of the embodiments of the present invention provides a bone conduction speaker, comprising a panel and a driving device; the driving device is used to generate a driving force; the panel and the driving device are in transmission connection; the whole or part of the panel is used to contact or abut against the user's body to conduct sound; the area on the panel used to contact or abut against the user's body has a normal, and the straight line where the driving force is located is not parallel to the normal.

[0005] In some embodiments, the straight line where the driving force is located is set to have a positive direction pointing outside the bone conduction speaker through the panel, and the normal line is set to have a positive direction pointing outside the bone conduction speaker, then the angle between the two straight lines in their positive directions is an acute angle.

[0006] In some embodiments, the driving device includes a coil and a magnetic circuit system, and the axis of the coil and the magnetic circuit system is not parallel to the normal line; the axis is perpendicular to the radial plane of the coil and / or the radial plane of the magnetic circuit system.

[0007] In some embodiments, a shell is further included; a connecting medium is provided between the shell and the panel, or the shell and the panel are integrally formed.

[0008] In some embodiments, the coil is connected to the panel and / or the housing via a first transmission path; and the magnetic circuit system is connected to the panel and / or the housing via a second transmission path.

[0009] In some embodiments, the first transmission path includes a connecting member, and the second transmission path includes a vibration transmission plate; the stiffness of the connecting member is higher than the stiffness of the vibration transmission plate.

[0010] In some embodiments, the stiffness of a component on the first transmission path or the second transmission path is 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, reinforcing ribs are provided on the connecting member.

[0012] In some embodiments, the reinforcing ribs are facades or support rods.

[0013] In some embodiments, the connecting member is a hollow cylinder, one end surface of the hollow cylinder is connected to one end surface of the coil, and the other end surface of the cylinder is connected to the panel and / or the shell.

[0014] In some embodiments, the connecting member is a group of connecting rods, one end of each connecting rod is connected to an end surface of the coil, and the other end of each connecting rod is connected to the panel and / or the shell; the connecting rods are distributed circumferentially around the coil.

[0015] In some embodiments, the driving force has components in the first quadrant and / or third quadrant of the xoy plane coordinate system; wherein the origin o of the xoy plane coordinate system is located on the contact surface between the bone conduction speaker and the human body, the x-axis is parallel to the coronal axis of the human body, the y-axis is parallel to the sagittal axis of the human body, and the positive direction of the x-axis is toward the outside of the human body, and the positive direction of the y-axis is toward the front of the human body.

[0016] In some embodiments, the number of the driving devices is at least 2; and the straight line where the resultant force of the driving forces generated by the driving devices lies is not parallel to the normal line.

[0017] In some embodiments, the straight line where the first driving force generated by the first driving device is located is parallel to the normal line, and the straight line where the second driving force generated by the second driving device is located is perpendicular to the normal line.

[0018] In some embodiments, the panel has an area range of 20 mm 2 ~1000mm 2 .

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

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

[0021] In some embodiments, the angle between the straight line where the driving force is located and the normal is 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 of ​​the panel for contacting or abutting against the user's body is flat.

[0023] In some embodiments, the area on the panel for contacting or abutting against the user's body is a quasi-plane; when the area of ​​the panel is a quasi-plane, the normal of the area is the average normal of the area; The average normal is: is the mean normal; is the normal of any point on the surface, and ds is the surface element; The quasi-plane is a surface on which the angle between the normal line of any point and its average normal line is less than a set threshold.

[0024] In some embodiments, the set threshold is less than 10°.

[0025] One of the embodiments of the present application provides another bone conduction speaker, comprising a panel and a driving device; the panel and the driving device are in transmission connection; the whole or part of the panel is used to contact or abut against the user's body to conduct sound; the area on the panel used to contact or abut against the user's body has a normal; the axis of the driving device is not parallel to the normal; the driving device comprises a coil and a magnetic circuit system, and the axis of the driving device is perpendicular to the radial plane of the coil and / or the radial plane of the magnetic circuit system.

[0026] In some embodiments, a shell is further included; a connecting medium is provided between the shell and the panel, or the shell and the panel are integrally formed.

[0027] In some embodiments, the coil is connected to the panel and / or the housing via a connector.

[0028] In some embodiments, reinforcing ribs are provided on the connecting member.

[0029] In some embodiments, the reinforcing ribs are facades or support rods.

[0030] In some embodiments, one side of the connecting member is shorter than the other side thereof so that the axis of the coil is not parallel to the normal line.

[0031] In some embodiments, the connecting member is a hollow cylinder, one end surface of the hollow cylinder is connected to one end surface of the coil, and the other end surface of the cylinder is connected to the panel and / or the shell.

[0032] In some embodiments, the connecting member is a group of connecting rods, one end of each connecting rod is connected to an end surface of the coil, and the other end of each connecting rod is connected to the panel and / or the shell; the connecting rods are distributed circumferentially around the coil.

[0033] In some embodiments, the area of ​​the panel for contacting or abutting against the user's body is flat.

[0034] In some embodiments, the area on the panel for contacting or abutting against the user's body is a quasi-plane; when the area of ​​the panel is a quasi-plane, the normal of the area is the average normal of the area; The average normal is: is the mean normal; is the normal of any point on the surface, and ds is the surface element; The quasi-plane is a surface on which the angle between the normal line of any point and its average normal line is less than a set threshold.

[0035] In some embodiments, the set threshold is less than 10°.

[0036] In some embodiments, the panel has an area range of 20 mm 2 ~1000mm 2 .

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

[0038] In some embodiments, the axis of the driving device is set to have a positive direction pointing outside the bone conduction speaker through the panel, and the normal line is set to have a positive direction pointing outside the bone conduction speaker, then the angle between the two straight lines in their positive directions is an acute angle.

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

[0040] In some embodiments, the angle between the straight line where the driving force is located and the normal is 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] Yet another embodiment of the present invention provides yet another bone conduction speaker, comprising a panel and at least two driving devices; the panel is in transmission connection with both driving devices; the entire or a portion of the panel is used to contact or abut against the user's body to conduct sound; the area on the panel used to contact or abut against the user's body has a normal; wherein the axis of the first driving device is parallel to the normal, and the axis of the second driving device is perpendicular to the normal; the driving device comprises a coil and a magnetic circuit system, and the axis of the driving device is perpendicular to the radial plane of the coil and / or the radial plane of the magnetic circuit system.

[0042] In some embodiments, the area of ​​the panel for contacting or abutting against the user's body is flat.

[0043] In some embodiments, the area on the panel for contacting or abutting against the user's body is a quasi-plane; when the area of ​​the panel is a quasi-plane, the normal of the area is the average normal of the area; The average normal is: is the mean normal; is the normal of any point on the surface, and ds is the surface element; The quasi-plane is a surface on which the angle between the normal line of any point and its average normal line is less than a set threshold.

[0044] In some embodiments, the set threshold is less than 10°.

[0045] One embodiment of the present invention provides a bone conduction headset, comprising any one of the bone conduction speakers described above.

[0046] One of the embodiments of the present invention provides a method for setting up a bone conduction speaker, comprising: connecting a panel to a driving device in a transmission connection; the whole or part of the panel is used to contact or abut against a user's body to conduct sound; the area on the panel used to contact or abut against the user's body has a normal line; and the relative position of the driving device and the panel is set so that the straight line where the driving force generated by the driving device is located is not parallel to the normal line.

[0047] In some embodiments, the relative position of the driving device and the panel is set so that the driving force has a component in the first quadrant and / or the third quadrant of the xoy plane coordinate system; wherein the origin o of the xoy plane coordinate system is located on the contact surface between the bone conduction speaker and the human body, the x-axis is parallel to the coronal axis of the human body, the y-axis is parallel to the sagittal axis of the human body, and the positive direction of the x-axis is toward the outside of the human body, and the positive direction of the y-axis is toward the front of the human body.

[0048] In some embodiments, the number of the driving devices is at least 2; the relative position of each driving device and the panel is set so that the straight line where the resultant force of the driving forces generated by each driving device lies is not parallel to the normal line.

[0049] In some embodiments, the area of ​​the panel for contacting or abutting against the user's body is flat.

[0050] In some embodiments, the area on the panel for contacting or abutting against the user's body is a quasi-plane; when the area of ​​the panel is a quasi-plane, the normal of the area is the average normal of the area; The average normal is: is the mean normal; is the normal of any point on the surface, and ds is the surface element; The quasi-plane is a surface on which the angle between the normal line of any point and its average normal line is less than a set threshold.

[0051] In some embodiments, the set threshold is less than 10°. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] The present invention is further described according to exemplary embodiments. These exemplary embodiments are described in detail with reference to the accompanying drawings. These embodiments are non-limiting exemplary embodiments, in which like reference numerals represent similar structures in at least two views of the accompanying drawings, and in which:

[0053] Figure 1 It is an application scenario and structural diagram of a bone conduction speaker provided according to the present invention;

[0054] Figure 2 is a schematic diagram of an angle direction provided according to the present invention;

[0055] Figure 3 It is a schematic diagram of the structure of a bone conduction speaker provided by the present invention acting on human skin and bones;

[0056] Figure 4 is a diagram showing the relationship between angle and relative displacement of a bone conduction speaker provided according to the present invention;

[0057] Figure 5 is a frequency response curve diagram of a bone conduction speaker provided according to the present invention;

[0058] Figure 6 is a schematic diagram of the low-frequency band portion of the frequency response curve of the bone conduction speaker at different angles θ provided by the present invention;

[0059] Figure 7 It is a schematic diagram of the high frequency band portion of the frequency response curve of the bone conduction speaker with different panel and housing materials provided by the present invention;

[0060] Figure 8 is a schematic diagram of the axial cross-sectional structure of the bone conduction speaker shown in the first embodiment of the present invention;

[0061] Fig. 9A is a schematic diagram of the axial cross-sectional structure of a bone conduction speaker according to the second embodiment of the present invention;

[0062] Fig. 9B is a schematic diagram of the disassembled structure of the components of a bone conduction speaker shown in a product example of Embodiment 2 of the present invention;

[0063] Fig. 9C is based on Fig. 9B A schematic diagram of the longitudinal cross-sectional structure of the bone conduction speaker shown;

[0064] Fig.9D , 9E is a schematic diagram of the structure of a bracket in a bone conduction speaker provided in some specific embodiments of the present invention;

[0065] Fig.10 is a schematic diagram of the axial cross-sectional structure of the bone conduction speaker shown in the third embodiment of the present invention;

[0066] Fig.11 is a schematic diagram of the axial cross-sectional structure of the bone conduction speaker according to the fourth embodiment of the present invention;

[0067] Fig.12 is a schematic diagram of the axial cross-sectional structure of the bone conduction speaker shown in the fifth embodiment of the present invention;

[0068] Fig.13 is a schematic diagram of the axial cross-sectional structure of the bone conduction speaker shown in the sixth embodiment of the present invention;

[0069] Fig.14 is a schematic diagram of the axial cross-sectional structure of the bone conduction speaker shown in the seventh embodiment of the present invention;

[0070] Fig.15 is a schematic diagram of the axial cross-sectional structure of the bone conduction speaker according to the eighth embodiment of the present invention; and

[0071] Fig.16 It is a schematic diagram of the axial cross-sectional structure of the bone conduction speaker shown in the ninth embodiment of the present invention.

[0072] Fig.17 It is a flow chart of a method for setting a bone conduction speaker provided according to the present invention. DETAILED DESCRIPTION

[0073] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention and do not limit the scope of application of the present invention. For ordinary technicians in this field, the present invention can be applied to other similar scenarios based on these drawings without paying any creative work.

[0074] As shown in this specification and claims, unless the context clearly indicates an exception, the words "a", "an", "a kind" and / or "the" do not specifically refer to the singular and may also include the plural, unless the context clearly indicates an exception. Generally speaking, the terms "include" and "comprise" only indicate the inclusion of the steps and elements that have been clearly identified, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements. The term "based on" means "at least partially based on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment". The relevant definitions of other terms will be given in the following description.

[0075] In the following, without loss of generality, when describing the bone conduction related technology in the present invention, the description of "bone conduction speaker" or "bone conduction earphone" will be adopted. This description is only one form of bone conduction application. For ordinary technicians in this field, "speaker" or "earphone" can also be replaced by other similar words, such as "player", "hearing aid", etc. In fact, the various implementation methods in the present invention can be easily applied to other non-speaker hearing devices. For example, for professionals in this field, after understanding the basic principle of bone conduction speakers, it is possible to make various modifications and changes in form and details to the specific methods and steps of implementing bone conduction speakers without deviating from this principle. In particular, the function of environmental sound pickup and processing is added to the bone conduction speaker to enable the speaker to realize the function of a hearing aid. For example, a microphone or other sound source can pick up the sound of the user / wearer's surrounding environment, and transmit the processed sound (or the generated electrical signal) to the bone conduction speaker part under a certain algorithm. That is, the bone conduction speaker can be modified to add the function of picking up ambient sound, and after certain signal processing, the sound is transmitted to the user / wearer through the bone conduction speaker part, thereby realizing the function of a bone conduction hearing aid. As an example, the algorithm mentioned here can include one or more combinations of noise elimination, automatic gain control, acoustic feedback suppression, wide dynamic range compression, active environmental recognition, active anti-noise, directional processing, tinnitus processing, multi-channel wide dynamic range compression, active howling suppression, volume control, etc.

[0076] Bone conduction speakers transmit sound to the hearing system through bones, thereby producing hearing. Generally speaking, bone conduction speakers mainly produce and transmit sound through the following steps: Step 1, the bone conduction speaker obtains or generates a signal containing sound information, such as a current signal and / or a voltage signal carrying audio information; Step 2, the driving device, or transducer device, in the bone conduction speaker generates vibration according to the signal; Step 3, the vibration is transmitted to the panel or shell of the speaker through the transmission component.

[0077] Specifically, in step 1, the bone conduction speaker can obtain or generate a signal containing sound information in different ways. Sound information can refer to a video or audio file with a specific data format, or it can refer to data or files that can be carried in a general sense and eventually converted into sound through a specific path. The signal containing sound information can come from the storage unit of the bone conduction speaker itself, or it can come from an information generation, storage or transmission system other than the bone conduction speaker. The sound signal discussed here is not limited to electrical signals, but can also include other forms other than electrical signals, such as optical signals, magnetic signals, mechanical signals, etc. In principle, as long as the signal contains sound information that the speaker can use to generate vibrations, it can be processed as a sound signal. The sound signal is not limited to one signal source, but can come from multiple signal sources. These multiple signal sources can be related or unrelated to each other. The way of transmitting or generating the sound signal can be wired or wireless, and can be real-time or delayed. For example, the bone conduction speaker can receive an electrical signal containing sound information by wire or wireless means, or it can directly obtain data from a storage medium to generate a sound signal. In some embodiments, a component with a sound collection function can be added to the bone conduction hearing aid, which can achieve a noise reduction effect by picking up the ambient background sound and processing the received sound signal. Wherein, the wired connection includes but is not limited to the use of metal cables, optical cables or hybrid cables of metal and optical, such as: coaxial cables, communication cables, flexible cables, spiral cables, non-metallic sheathed cables, metal sheathed cables, multi-core cables, twisted pair cables, ribbon cables, shielded cables, telecommunication cables, two-strand cables, parallel two-core conductors, and twisted pairs.

[0078] The examples described above are only for the convenience of explanation. The medium of the wired connection can also be other types, for example, other transmission carriers of electrical signals or optical signals. Wireless connection includes but is not limited to radio communication, free space optical communication, acoustic communication, and electromagnetic induction. Among them, radio communication includes but is not limited to IEEE302.11 series standards, IEEE302.15 series standards (such as Bluetooth technology and ZigBee technology), first generation mobile communication technology, second generation mobile communication technology (such as FDMA, TDMA, SDMA, CDMA, and SSMA), general packet radio service technology, third generation mobile communication technology (such as CDMA2000, WCDMA, TD-SCDMA, and WiMAX), fourth generation mobile communication technology (such as TD-LTE and FDD-LTE), satellite communication (such as GPS technology), near field communication (NFC) and other technologies running in the ISM frequency band (such as 2.4GHz, etc.); free space optical communication includes but is not limited to visible light, infrared signals, etc.; acoustic communication includes but is not limited to sound waves, ultrasonic signals, etc.; electromagnetic induction includes but is not limited to near field communication technology, etc. The examples described above are only for the convenience of explanation, and the wireless connection medium may also be other types, such as Z-wave technology, other paid civilian radio frequency bands and military radio frequency bands, etc. For example, as some application scenarios of this technology, the bone conduction speaker can obtain signals containing sound information from other devices through Bluetooth technology, or directly obtain data from the storage unit of the bone conduction speaker itself, and then generate a sound signal.

[0079] The storage devices / storage units mentioned here include storage devices on storage systems such as direct attached storage, network attached storage, and storage area network. Storage devices include but are not limited to various common storage devices such as solid-state storage devices (solid-state hard disks, solid-state hybrid hard disks, etc.), mechanical hard disks, USB flash drives, memory sticks, memory cards (such as CF, SD, etc.), other drives (such as CD, DVD, HDDVD, Blu-ray, etc.), random access memory (RAM) and read-only memory (ROM). RAM includes but is not limited to: decimal counter tube, selector tube, delay line memory, Williams tube, dynamic random access memory (DRAM), static random access memory (SRAM), thyristor random access memory (T-RAM), and zero capacitance random access memory (Z-RAM); ROM includes but is not limited to: bubble memory, magnetic button line memory, thin film memory, magnetic plated line memory, magnetic core memory, magnetic drum memory, optical drive, hard disk, magnetic tape, early NVRAM (non-volatile memory), phase change memory, magnetoresistive random access memory, ferroelectric random access memory, non-volatile SRAM, flash memory, electronically erasable rewritable read-only memory, erasable programmable read-only memory, programmable read-only memory, shielded stack read memory, floating connection gate random access memory, nano random access memory, racetrack memory, variable resistance memory, and programmable metallization unit, etc. The above-mentioned storage devices / storage units are listed as some examples, and the storage devices that can be used by the storage device / storage unit are not limited to these.

[0080] Figure 1 1 is an application scenario and structural diagram of a bone conduction speaker provided according to the present invention. Figure 1 As shown, the bone conduction speaker includes a driving device 101, a transmission component 102, a panel 103, and a housing 104. The driving device 101 transmits a vibration signal to the panel 103 and / or the housing 104 through the transmission component 102, thereby transmitting the sound to the human body through the contact between the panel 103 or the housing 104 and the human skin. In some embodiments, the panel 103 and / or the housing 104 of the bone conduction speaker can contact the human skin at the tragus, thereby transmitting the sound to the human body. In some embodiments, the panel 103 and / or the housing 104 can also contact the human skin at the back of the auricle.

[0081] Bone conduction speakers can convert signals containing sound information into vibrations and generate sound. The generation of vibrations is accompanied by the conversion of energy. Bone conduction speakers can use specific drive devices to realize the conversion of signals into mechanical vibrations. The conversion process may include the coexistence and conversion of multiple different types of energy. For example, an electrical signal can be directly converted into mechanical vibrations through a transducer to generate sound. For another example, the sound information is contained in an optical signal, and the drive device can realize the process of converting the optical signal into a vibration signal, or the drive device can first convert the optical signal into an electrical signal, and then convert the electrical signal into a vibration signal. Other types of energy that can coexist and convert during the operation of the drive device include thermal energy, magnetic field energy, etc. The energy conversion methods of the drive device include but are not limited to dynamic, electrostatic, piezoelectric, moving iron, pneumatic, electromagnetic, etc. The frequency response range and sound quality of the bone conduction speaker will be affected by different transducer methods and the performance of each physical component in the drive device. For example, in a dynamic transducer device, the wound cylindrical coil is connected to the vibration plate, and the coil driven by the signal current drives the vibration plate to vibrate and produce sound in the magnetic field. The stretching and contraction of the vibration plate material, the deformation, size, shape and fixing method of the folds, the magnetic density of the permanent magnet, etc., will have a great impact on the final sound quality of the bone conduction speaker. For another example, the vibration plate can be a mirror-symmetrical structure, a centrally symmetrical structure or an asymmetrical structure; the vibration plate can be provided with an intermittent hole structure to make the vibration plate produce a larger displacement, so that the bone conduction speaker can achieve higher sensitivity and improve the output power of vibration and sound; for another example, the vibration plate is a torus structure, and a plurality of support rods radiating to the center are provided in the torus, and the number of support rods can be two or more.

[0082] Obviously, for professionals in this field, after understanding the basic principle that the transducer mode and specific device can affect the sound quality of the bone conduction speaker, it is possible to make appropriate trade-offs, combinations, corrections or changes to the above-mentioned influencing factors without deviating from this principle, so as to obtain ideal sound quality. For example, using permanent magnets with high magnetic density, more ideal vibration plate materials and designs can obtain better sound quality.

[0083] The term "sound quality" used here can be understood as reflecting the quality of sound, referring to the fidelity of audio after processing, transmission and other processes. Sound quality is mainly described by three elements: loudness, pitch and timbre. Loudness is the subjective feeling of the human ear to the strength of sound, which is proportional to the logarithmic value of the sound intensity. The greater the sound intensity, the louder it sounds. It is also related to the frequency and waveform of the sound. Tone, also known as pitch, refers to the subjective feeling of the human ear to the high and low frequency of sound vibration. Tone mainly depends on the fundamental frequency of the sound. The higher the fundamental frequency, the higher the pitch. At the same time, it is also related to the intensity of the sound. Timbre refers to the subjective feeling of the human ear to the characteristics of the sound. Timbre mainly depends on the spectral structure of the sound, and is also related to factors such as the loudness, duration, build-up process and decay process of the sound. The spectral structure of the sound is described by the fundamental frequency, the number of harmonic frequencies, the distribution of harmonic frequencies, the amplitude and the phase relationship. Different spectral structures have different timbres. Even if the fundamental frequency and loudness are the same, if the harmonic structure is different, the timbre will be different.

[0084] like Figure 1 As shown, according to the bone conduction speakers provided in some specific embodiments of the present invention, the straight line B where the driving force generated by the driving device 101 is located (or the vibration direction of the driving device) has an angle θ with the normal line A of the panel 103. In other words, the straight line B is not parallel to the straight line A.

[0085] The panel has an area that contacts or abuts against the user's body, such as human skin. It should be understood that when the panel is covered with other materials (such as soft materials such as silicone) to enhance the user's wearing comfort, the relationship between the panel and the user's body is not direct contact, but mutual abutment. In some embodiments, when the bone conduction speaker is worn on the user's body, the entire area of ​​the panel contacts or abuts against the user's body. In some embodiments, when the bone conduction speaker is worn on the user's body, a partial area of ​​the panel contacts or abuts against the user's body. In some embodiments, the area on the panel used to contact or abut against the user's body can account for more than 50% of the entire panel area, and more preferably, it can account for more than 60% of the panel area. Generally speaking, the area on the panel that contacts or abuts against the user's body can be a flat surface or a curved surface.

[0086] In some embodiments, when the area on the panel for contacting or abutting against the user's body is a plane, its normal meets the general definition of a normal. In some embodiments, when the area on the panel for contacting or abutting against the user's body is a curved surface, its normal is the average normal of the area.

[0087] The mean normal is defined as follows: is the mean normal; is the normal of any point on the surface, and ds is the surface element.

[0088] Furthermore, the curved surface is a quasi-plane close to a plane, that is, a surface in which the angle between the normal line of any point in at least 50% of the area on the curved surface and its average normal line is less than a set threshold. In some embodiments, the set threshold is less than 10°; in some embodiments, the set threshold can be further less than 5°.

[0089] In some embodiments, the straight line B where the driving force is located has the angle θ with the normal line A' of the area on the panel 103 that is used to contact or abut against the user's body. The numerical range of the angle θ can be 0<θ<180°, and further its numerical range can be 0<θ<180° and not equal to 90°. In some embodiments, the straight line B is set to have a positive direction pointing outside the bone conduction speaker, and the normal line A of the panel 103 (or the normal line A' of the contact surface of the panel 103 and the human skin) is also set to have a positive direction pointing outside the bone conduction speaker, then the angle θ formed by the straight line A or A' and the straight line B in its positive direction is an acute angle, that is, 0<θ<90°.

[0090] Figure 2 Schematic diagram of an angle direction provided according to the present invention. Figure 2As shown, in some embodiments, the driving force generated by the driving device has a component in the first quadrant and / or the third quadrant of the xoy plane coordinate system. The xoy plane coordinate system is a reference coordinate system, whose origin o is located on the contact surface between the panel and / or the housing and the human body after the bone conduction speaker is worn on the human body, the x-axis is parallel to the human coronal axis, the y-axis is parallel to the human sagittal axis, and the positive direction of the x-axis is toward the outside of the human body, and the positive direction of the y-axis is toward the front of the human body. The quadrant should be understood as the four areas divided by the horizontal axis (such as the x-axis) and the vertical axis (such as the y-axis) in the plane rectangular coordinate system, and each area is called a quadrant. The quadrant is centered on the origin, and the x and y axes are dividing lines. The upper right (area surrounded by the positive semi-axis of the x-axis and the positive semi-axis of the y-axis) is called the first quadrant, the upper left (area surrounded by the negative semi-axis of the x-axis and the positive semi-axis of the y-axis) is called the second quadrant, the lower left (area surrounded by the negative semi-axis of the x-axis and the negative semi-axis of the y-axis) is called the third quadrant, and the lower right (area surrounded by the positive semi-axis of the x-axis and the negative semi-axis of the y-axis) is called the fourth quadrant. Wherein, the point on the coordinate axis does not belong to any quadrant. It should be understood that the driving force described in this embodiment can be directly located in the first quadrant and / or the third quadrant of the xoy plane coordinate system, or the driving force is toward other directions, but the projection or component in the first quadrant and / or the third quadrant of the xoy plane coordinate system is not 0, and the projection or component in the z-axis direction can be 0 or not 0. Wherein, the z-axis is perpendicular to the xoy plane and passes through the origin o. In some specific embodiments, the minimum angle θ between the straight line where the driving force is located and the normal of the area on the panel that contacts or abuts against the user's body can be any acute angle. For example, the range of the angle θ is preferably 5° to 80°; more preferably 15° to 70°; more preferably 25° to 60°; more preferably 25° to 50°; more preferably 28° to 50°; more preferably 30° to 39°; more preferably 31° to 38°; more preferably 32° to 37°; more preferably 33° to 36°; more preferably 33° to 35.8°; more preferably 33.5° to 35°. Specifically, the angle θ can be 26°, 27°, 28°, 29°, 30°, 31°, 32°, 33°, 34°, 34.2°, 35°, 35.8°, 36°, 37° or 38°, etc., and the error is controlled within 0.2 degrees. It should be noted that the above description of the direction of the driving force should not be understood as a limitation of the driving force in the present invention. In other embodiments, the driving force may also have components in the second and fourth quadrants in the xoy plane coordinate system, and even the driving force may be located on the y axis, etc.

[0091] Figure 3It is a schematic diagram of the structure of the bone conduction speaker provided according to the present invention acting on human skin and bones. The bone conduction speaker receives, picks up or generates a signal containing sound information, converts the sound information into sound vibrations through a driving device, and transmits the vibrations to the human skin 320 in contact with the panel or the housing through a transmission component, and further transmits the vibrations to the human skeleton 310, so that the user can finally hear the sound. Without loss of generality, the subject of the hearing system, sensory organs, etc. described above can be a human or an animal with a hearing system. It should be noted that the following description of humans using bone conduction speakers does not constitute a limitation on the use scenarios of bone conduction speakers, and similar descriptions can also be applied to other animals.

[0092] like Figure 3 As shown, the bone conduction speaker includes a driving device (which may also be referred to as a transducer device in other embodiments), a transmission assembly 303 , a panel 301 , and a housing 302 .

[0093] The vibration of the panel 301 is transmitted to the auditory nerve through the tissue and bones, so that the person can hear the sound. The panel 301 can be in direct contact with the human skin, or can be in contact with the skin through a vibration transmission layer composed of a specific material. The position where the panel 301 fits the human body can be near the tragus, or can be the mastoid, behind the ear or other positions.

[0094] The physical properties of the panel, such as mass, size, shape, stiffness, vibration damping, etc., will affect the efficiency of the panel vibration. Those skilled in the art can select a panel made of appropriate materials according to actual needs, or use different molds to injection mold the panel into different shapes. For example, the shape of the panel can be set to a rectangle, circle, or ellipse; or, the shape of the panel can be a shape obtained by cutting the edges of a rectangle, circle, or ellipse (for example, but not limited to, symmetrically cutting a circle to obtain a shape similar to an ellipse or a runway, etc.). Further preferably, the panel can be set to be hollow. Just as an example, the area size of the panel can be set as needed. In some specific embodiments, the panel area can range from 20mm 2 ~1000mm 2 Specifically, the side length of the panel can range from 5mm to 40mm, or from 18mm to 25mm, or from 11mm to 18mm. For example, the panel is a rectangle with a length of 22mm and a width of 14mm, or an ellipse with a major axis of 25mm and a minor axis of 15mm.

[0095] The panel materials mentioned here include but are not limited to steel, alloy, plastic and single or composite materials. Among them, steel includes but is not limited to stainless steel, carbon steel, etc. Alloy includes but is not limited to aluminum alloy, chrome-molybdenum steel, scandium alloy, magnesium alloy, titanium alloy, magnesium-lithium alloy, nickel alloy, etc. Plastic includes but is 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 and blow-molded nylon, etc. For single or composite materials, it includes but is not limited to reinforcing materials such as glass fiber, carbon fiber, boron fiber, graphite fiber, graphene fiber, silicon carbide fiber or aramid fiber; it can also be a composite of other organic and / or inorganic materials, such as various types of fiberglass reinforced with unsaturated polyester, epoxy resin or phenolic resin matrix.

[0096] In some other embodiments, the outer side of the panel of the bone conduction speaker is wrapped with a vibration transmission layer, the vibration transmission layer is in contact with the skin, and the vibration system composed of the panel and the vibration transmission layer transmits the generated sound vibration to the human tissue. The vibration transmission layer can be multi-layered. The vibration transmission layer can be made of one or more materials, and the material composition of different vibration transmission layers can be the same or different; the multiple vibration transmission layers can be superimposed on each other in the vertical direction of the panel, or can be spread out and arranged in the horizontal direction of the panel. The vibration transmission layer can also be superimposed at a certain angle to the panel, and the angle between each layer and the panel can be the same or different, or any combination of the above methods can be performed. The composition of the vibration transmission layer can be a material with certain adsorption, flexibility, and chemical properties, such as plastic (for example, but not limited to high molecular polyethylene, blown nylon, engineering plastics, etc.), rubber, or other single 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, the entire area of ​​the panel contacts or abuts against the user's body. In some embodiments, when the bone conduction speaker is worn on the user's body, a portion of the panel contacts or abuts against the user's body. In some embodiments, the area on the panel used to contact or abut the user's body can account for more than 50% of the entire panel area, and more preferably, it can account for more than 60% of the panel area. Generally speaking, the user's skin is relatively flat, and when the panel and the skin are fitted in a plane or a quasi-plane without large undulations, the panel can fit a larger area with the skin, thereby making the volume louder. For example, the panel can be a composite structure with a plane in the middle and arc chamfers on the edges. One of the benefits of this is that the panel is in full contact with human skin and has a curved surface to ensure adaptability when worn by different people.

[0098] In some embodiments, the panel 301 can cooperate with the shell 302 to form a closed or quasi-closed cavity (such as a hole is opened on the panel or the shell) to accommodate the driving device. Specifically, the panel 301 and the shell 302 can be integrally formed, that is, the panel and the shell are made of the same material, and there is no clear boundary between the two in structure. Or the panel 301 can also be connected to the shell 302 by snap-on, riveting, hot melting or welding. In some other embodiments, the panel 301 and the shell 302 are connected by a connecting medium. The connecting medium can be an adhesive, such as polyurethane, polystyrene, polyacrylate, ethylene-vinyl acetate copolymer, shellac, butyl rubber, etc. The connecting medium can also include connecting components with specific structures, such as vibration transmission plates, connecting rods, etc. The rigidity of the shell, the panel itself, and the connection rigidity between the shell and the panel will affect the frequency response of the speaker. In some embodiments, the shell and the panel are made of materials with greater rigidity, while the rigidity of the connecting medium between the shell and the panel is smaller, and when the driving device vibrates, the panel and the shell do not vibrate synchronously. In other embodiments, the housing and the panel are both made of materials with relatively high rigidity, and the connection rigidity between the housing and the panel is also relatively high, which results in a larger overall rigidity of the vibration system, and thus causes the resonant part to contain more high-frequency components. In some embodiments, the rigidity of the panel and the housing can be increased by adjusting the rigidity of the panel and the housing, and the peaks and valleys in the high-frequency region can be adjusted to a higher-frequency frequency band. For more descriptions of the relationship between component rigidity and sound quality, please refer to other contents in the text (for example, Figure 7 ).

[0099] In some embodiments, the housing has greater rigidity and lighter weight, and can be mechanically vibrated as a whole, and the housing can ensure consistency of vibration, form mutually offsetting sound leakage, and ensure good sound quality and loud volume. In some embodiments, the housing may be free of holes or may have holes. For example, the holes on the housing can be used to adjust the sound leakage of the bone conduction speaker.

[0100] The stiffness can be understood as the ability of a material or structure to resist elastic deformation when subjected to force, which is related to the elastic modulus, shape, structure or installation method of the material of the component. For example, the stiffness of a component is positively correlated with the elastic modulus and thickness of the component, and negatively correlated with the surface area of ​​the component. In a specific embodiment, the component may be a panel, a housing or a transmission component, etc. Specifically, the stiffness of a sheet component such as a panel can be expressed by the following expression: k∝(Eh^3) / d^2, where k is the stiffness of the panel, E is the elastic modulus of the panel, h is the thickness of the panel, and d is the radius of the panel. It can be seen that the smaller the panel radius, the thicker the thickness, and the greater the elastic modulus, the greater the corresponding panel stiffness. In some other embodiments, the stiffness of a rod-shaped or strip-shaped transmission component can be expressed by the following expression: k∝(Eh^3w) / l^3, where k is the stiffness of the transmission component, E is the elastic modulus of the transmission component, h is the thickness of the transmission component, w is the width of the transmission component, and l is the length of the transmission component. It can be seen from this that the smaller the length, the thicker the thickness, the larger the width, and the larger the elastic modulus of the transmission component, the greater the stiffness of the corresponding transmission component.

[0101] In some embodiments, the driving device is located in a closed or quasi-closed space formed by the panel and the housing (for example, when there is an opening on the panel or the housing); in other embodiments, the driving device is located in a closed or quasi-closed space formed by the housing, and the panel is independently arranged from the housing. Fig.15 The driving device is used to convert the electrical signal into vibrations of different frequencies and amplitudes. The working modes of the driving device include but are not limited to moving coils, moving irons, piezoelectric ceramics or other working modes.

[0102] As an example only, the following uses the dynamic coil method as an example to further explain. Figure 3 In the embodiment, the driving device is a moving coil driving method, including a coil 304 and a magnetic circuit component 307.

[0103] The magnetic circuit assembly 307 may include a first magnetic element 3071, a first magnetic conductive element 3072, and a second magnetic conductive element 3073. The magnetic element described in the present application refers to an element that can generate a magnetic field, such as a magnet. The magnetic element may have a magnetization direction, and the magnetization direction refers to the direction of the magnetic field inside the magnetic element. The first magnetic element 3071 may include one or more magnets. In some embodiments, the magnet may include a metal alloy magnet, a ferrite, and the like. Among them, the metal alloy magnet may include neodymium iron boron, samarium cobalt, aluminum nickel cobalt, iron chromium cobalt, aluminum iron boron, iron carbon aluminum, or the like, or a combination of multiple thereof. The ferrite may include barium ferrite, steel ferrite, manganese ferrite, lithium manganese ferrite, or the like, or a combination of multiple thereof.

[0104] The magnetic conductive element may also be referred to as a magnetic field concentrator or an iron core, which may adjust the distribution of a magnetic field (e.g., the magnetic field generated by the first magnetic element 3071). In some embodiments, the lower surface of the first magnetic conductive element 3072 may be connected to the upper surface of the first magnetic element 3071. The second magnetic conductive element 3073 may be a concave structure, specifically, may include a bottom wall and a side wall. The inner side of the bottom wall of the second magnetic conductive element 3073 may be connected to the first magnetic element 3071, and the side wall may surround the first magnetic element 3071 and form a magnetic gap with the first magnetic element 3071. The connection method between the first magnetic conductive element 3072, the second magnetic conductive element 3073 and the first magnetic element 3071 may include one or more combinations of bonding, clamping, welding, riveting, bolting, etc.

[0105] The magnetic conductive element may include an element processed from a soft magnetic material. In some embodiments, the soft magnetic material may include a metal material, a metal alloy, a metal oxide material, an amorphous metal material, etc., such as iron, an iron-silicon alloy, an iron-aluminum alloy, a nickel-iron alloy, an iron-cobalt alloy, a low-carbon steel, a silicon steel sheet, a silicon steel sheet, a ferrite, etc. In some embodiments, the magnetic conductive body may be processed by one or more combinations of casting, plastic processing, cutting processing, powder metallurgy, etc. Casting may include sand casting, investment casting, pressure casting, centrifugal casting, etc.; plastic processing may include one or more combinations of rolling, casting, forging, stamping, extrusion, drawing, etc.; cutting processing may include turning, milling, planing, grinding, etc. In some embodiments, the processing method of the magnetic conductive body may include 3D printing, CNC machine tools, etc.

[0106] It should be understood that the above description of the structure of the driving device should not be used as a limitation of the present invention. In some other embodiments, there are multiple magnetic elements in the magnetic circuit assembly, and the multiple magnetic elements are stacked together from top to bottom. Additional magnetic conductive elements can be set in adjacent magnetic elements, and another magnetic conductive element can be set on the upper surface of the topmost magnetic element. The magnetic element is an element that generates a magnetic field, and the magnetic conductive element is used to adjust the distribution of the magnetic field. The magnetic circuit assembly structure set according to specific magnetic field distribution requirements can be used in the bone conduction speaker of the present invention, and the present invention does not impose any limitations on this.

[0107] The coil 304 can be arranged in the magnetic gap between the first magnetic element 3071 and the second magnetic conductive element 3073. After the coil 304 in the magnetic gap is energized, it vibrates under the action of the Ampere force (i.e., the driving force), and the magnetic circuit component 307 is subjected to a reaction force and vibrates. The driving device also includes a transmission component 303, which is used to transmit the vibration of the coil 304 and / or the magnetic circuit component 307 to the panel and / or the housing. Among them, the Ampere's force is the force exerted on the energized wire in the magnetic field, and its direction is perpendicular to the plane determined by the energized wire and the magnetic field direction, and can be determined by the left-hand rule. When the current direction and the magnetic field direction change, the direction of the Ampere force will also change. In some embodiments, the magnetic field generated by the magnetic circuit component is static, and when the current direction changes, the driving force direction will switch its direction positively and negatively on a straight line, and this straight line can be regarded as the straight line where the driving force is located. The coil will vibrate when it is acted upon by the driving force. At the same time, the magnetic circuit component will also vibrate due to the reaction force. The vibrations of the two are generally on the same straight line, but in opposite directions. This straight line can be regarded as the straight line where the vibration is located, which is equal to (i.e. parallel to) or the same as the straight line where the driving force is located.

[0108] In some embodiments, the vibration of the coil is transmitted to the panel and / or the housing through the first transmission assembly, and the vibration of the magnetic circuit assembly is transmitted to the panel and / or the housing through the second transmission assembly.

[0109] In some embodiments, after power is turned on, the coil vibrates under the action of the Ampere force, and the vibration of the coil is transmitted to the panel and / or the housing through the first transmission component. The coil interacts with the magnetic circuit component through the magnetic field, and the reaction force on the magnetic circuit component also generates vibration. The vibration of the magnetic circuit component is transmitted to the panel and / or the housing through the second transmission component. In some specific implementations, the transmission component may include a connecting rod, a connecting column and / or a vibration transmission sheet. In some embodiments, the transmission component may have a moderate elastic force so that it has a shock-absorbing effect during the vibration transmission process, which can reduce the vibration energy transmitted to the housing, thereby effectively suppressing the sound leakage of the bone conduction speaker to the outside caused by the vibration of the housing, and can also help avoid the occurrence of abnormal sounds caused by possible abnormal resonance, so as to achieve the effect of improving the sound quality. The transmission components located at different positions in / on the housing will also have different degrees of influence on the transmission efficiency of the vibration. In some specific embodiments, the transmission component can put the drive device in different states such as suspension or support. The vibration transmission piece can be a spring piece with a small thickness. Specifically, the main body of the vibration transmission piece can be a ring structure, and a plurality of support rods or a plurality of connecting pieces radiating to the center are arranged in the ring structure. The number of support rods or connecting pieces can be two or more. For more descriptions of the transmission assembly, please refer to other contents in the text (such as the specific embodiment part).

[0110] In some specific embodiments, the straight line where the driving force is located is colinear or parallel to the straight line where the driving device vibrates. For example, in a driving device based on the dynamic coil principle, the direction of the driving force can be the same as or opposite to the vibration direction of the coil and / or the magnetic circuit component. The panel can be a plane or a curved surface, or the panel can have a number of protrusions or grooves. In some embodiments, when the bone conduction speaker is worn on the user's body, the normal of the area on the panel that contacts or abuts the user's body is not parallel to the straight line where the driving force is located. Generally speaking, the area on the panel that contacts or abuts the user's body is relatively flat, and can be a plane or a quasi-plane with little curvature change. When the area on the panel that contacts or abuts the user's body is a plane, the normal of any point on it can be used as the normal of the area. When the panel on the panel that contacts or abuts the user's body is a non-planar panel, the normal of the area can be its average normal. For a detailed definition of the average normal, see Figure 1 The relevant description in will not be repeated here. In some other embodiments, when the panel used for contacting the user's body is a non-planar surface, the normal of the area can also be determined as follows: select a point in an area when the panel is in contact with the human skin, determine the tangent plane of the panel at the point, and then determine a straight line passing through the point and perpendicular to the tangent plane, and use the straight line as the normal of the panel. According to a specific embodiment of the present invention, the straight line where the driving force is located (or the straight line where the driving device vibrates) and the normal of the area have an angle θ, and the angle 0<θ<180°. In some specific embodiments, when the straight line where the driving force is specified has a positive direction pointing to the outside of the bone conduction speaker through the panel (or the contact surface between the panel and / or the housing and the human skin), the normal of the specified panel (or the contact surface between the panel and / or the housing and the human skin) has a positive direction pointing to the outside of the bone conduction speaker, and the angle formed by these two straight lines in the positive direction is an acute angle.

[0111] Furthermore, in some embodiments, the bone conduction speaker 300 includes a panel 301, a housing 302, a first transmission component 303, a coil 304, a vibration transmission piece 305, a second transmission component 306, and a magnetic circuit component 307. The vibrations of the coil 304 and the magnetic circuit component 307 can be transmitted to the panel 301 and / or the housing 302 via different paths. For example, the vibration of the coil 304 can be transmitted out of the panel 301 and / or the housing 302 via the first transmission path, and the vibration of the magnetic circuit component 307 can be transmitted to the panel 301 and / or the housing 302 via the second transmission path. The first transmission path may include the first transmission component 303, and the second transmission path includes the second transmission component 306, the vibration transmission piece 305, and the first transmission component 303. Specifically, a part of the first transmission component 303 is a structure with a flange, and the flange is annular and adapted to the structure of the coil 304, and the flange is connected to one end face of the coil 304, and the other part of the first transmission component 303 is a connecting rod, and the connecting rod is connected to the panel and / or the housing. The coil 304 is fully or partially sleeved in the magnetic gap of the magnetic circuit component 307. In the second transmission path, the second transmission component 306 is connected between the magnetic circuit component 307 and the vibration transmission piece 305, and the edge of the vibration transmission piece 305 is fixed on the flange of the first transmission component 303. The center of the vibration transmission piece 305 can be connected to one end of the second transmission component 306, and the edge of the vibration transmission piece 305 can be connected to the inner side of the flange of the first transmission component 303, and the connection method can be clamping, hot pressing, riveting, bonding, or injection molding. It should be noted that the first transmission path and the second transmission path can also have other structures, and this embodiment should not be used as a limitation of the transmission component. For more structural descriptions of the transmission component, please refer to other parts of the text.

[0112] In some embodiments, the coil 304 and the magnetic circuit assembly 307 are both annular structures. In some embodiments, the coil 304 and the magnetic circuit assembly 307 have mutually parallel axes, and the axis of the coil 304 or the magnetic circuit assembly 307 is perpendicular to the radial plane of the coil 304 and / or the radial plane of the magnetic circuit assembly 307. In some other embodiments, the coil 304 and the magnetic circuit assembly 307 have the same central axis, the central axis of the coil 304 is perpendicular to the radial plane of the coil 304 and passes through the geometric center of the coil 304, and the central axis of the magnetic circuit assembly 307 is perpendicular to the radial plane of the magnetic circuit assembly 307 and passes through the geometric center of the magnetic circuit assembly 307. The axis of the coil 304 or the magnetic circuit assembly 307 has the aforementioned angle θ with the normal line of the panel 301.

[0113] In this embodiment, the coil 304 after being energized generates an Ampere force and vibrates in the magnetic field generated by the magnetic circuit assembly 307, and the vibration of the coil 304 is transmitted to the panel 301 through the first transmission assembly 303, and the magnetic circuit assembly 307 vibrates through the reaction force, and the vibration generated by the magnetic circuit assembly 307 is transmitted to the panel 301 through the second transmission assembly 306, the vibration transmission sheet 305, and the first transmission assembly 303, and then the vibration of the coil 304 and the vibration of the magnetic circuit assembly 307 are transmitted to the skin and bones of the human body through the panel 301, so that the person can hear the sound. In short, the vibration generated by the coil 304 and the vibration generated by the magnetic circuit assembly 307 form a composite vibration and are transmitted to the panel 301, and then the composite vibration is transmitted to the skin and bones of the human body through the panel 301, so that the person can hear the bone conduction sound.

[0114] Just as an example, the following Figure 3 , describing the relationship between the driving force F and the skin deformation S. When the straight line where the driving force generated by the driving device is parallel to the normal line of the panel 301 (that is, the angle θ is zero), the relationship between the driving force and the total skin deformation is F ⊥ = S ⊥ ×E×A / h(1), where E ⊥ is the driving force, S ⊥ is the total deformation of the skin in the direction perpendicular to the skin, E is the elastic modulus of the skin, A is the contact area between the panel and the skin, and h is the total thickness of the skin (i.e., the distance between the panel and the bone).

[0115] When the straight line where the driving force of the driving device is located is perpendicular to the normal line of the area on the panel that contacts or abuts against the user's body (that is, the angle θ is 90 degrees), the relationship between the driving force in the vertical direction and the total skin deformation can be expressed as formula (2): F / / =S / / ×G×A / h (2) Among them, F / / is the driving force, S / / is the total deformation of the skin in the direction parallel to the skin, G is the shear modulus of the skin, A is the contact area between the panel and the skin, and h is the total thickness of the skin (i.e., the distance between the panel and the bone). The relationship between the shear modulus G and the elastic modulus E is G = E / 2(1+γ), where γ is the Poisson's ratio of the skin 0 < γ < 0.5, so the shear modulus G is smaller than the elastic modulus E, corresponding to the total deformation S of the skin under the same driving force / / >S ⊥ Typically, the Poisson's ratio of the skin is close to 0.4.

[0116] When the straight line where the driving device generates the driving force is not parallel to the normal line of the area where the panel contacts the user's body, the horizontal driving force and the vertical driving force are respectively expressed as the following formula (3) and formula (4): F ⊥ =F×cos(θ) (3) F / / =F×sin(θ) (4) The relationship between the driving force F and the skin deformation S can be expressed by the following formula (5): When the Poisson's ratio of the skin is 0.4, the detailed description of the relationship between the angle θ and the total skin deformation can be found in Figure 4 Found in.

[0117] Figure 4 : is a diagram showing the relationship between the angle and relative displacement of a bone conduction speaker provided according to the present invention. Figure 4 As shown in FIG. 1 , the relationship between the angle θ and the total skin deformation is that the larger the angle θ is, the greater the relative displacement is, and the greater the total skin deformation S is. ⊥ As the angle θ increases, the relative displacement decreases, and the skin deforms in the direction perpendicular to the skin. ⊥ becomes smaller; and when the angle θ is close to 90 degrees, the skin deforms in the direction perpendicular to the skin S ⊥ Gradually tends to 0.

[0118] The volume of the low-frequency part of the bone conduction headset is positively correlated with the total skin deformation S. The larger S is, the greater the volume of the low-frequency bone conduction. The volume of the high-frequency part of the bone conduction headset is positively correlated with the skin deformation S in the vertical direction of the skin. ⊥ Positive correlation. ⊥ The larger it is, the louder the volume of the bone-conducted low frequency will be.

[0119] When the Poisson's ratio of the skin is 0.4, the angle θ is related to the total deformation S of the skin, and the deformation S of the skin in the vertical direction is ⊥ A detailed description of the relationship between Figure 4 Found in Figure 4 As shown, the relationship between the angle θ and the total skin deformation S is that the larger the angle θ, the larger the total skin deformation S, and the larger the volume of the low-frequency part of the corresponding bone conduction earphone. Figure 4 As shown, the relationship between the angle θ and the skin deformation S⊥ in the direction perpendicular to the skin is that the larger the angle θ is, the smaller the skin deformation S⊥ in the direction perpendicular to the skin is, and the smaller the volume of the high-frequency part of the corresponding bone conduction earphone is.

[0120] Through equation (4) and Figure 4 It can be seen from the curve that as the angle θ increases, the speed at which the total skin deformation S increases is proportional to the skin deformation S in the direction perpendicular to the skin.⊥ The speed of decrease is different. The speed of increase of total skin deformation S first becomes faster and then slower. The skin deformation S in the vertical direction of the skin ⊥ The speed of reduction is getting faster and faster. In order to balance the volume of low frequency and high frequency of bone conduction headphones, the angle θ should be in a suitable size. For example, the range of θ is 5°~80°, or 15°~70°, or 25°~50°, or 25°~35°, or 25°~30°, etc.

[0121] Figure 5 : is a frequency response curve diagram of a bone conduction speaker provided according to the present invention. Figure 5 As shown, the horizontal axis of the coordinate is the vibration frequency, and the vertical axis is the vibration intensity of the bone conduction headset. In some embodiments, in the frequency response range of 500 to 6000 Hz, the flatter the frequency response curve is, the better the sound quality of the bone conduction headset is. The structure of the bone conduction headset, the design of the components, the material properties, etc. may all have an impact on the frequency response curve. Generally, low frequency refers to sounds less than 500 Hz, mid-frequency refers to sounds in the range of 500 Hz-4000 Hz, and high frequency refers to sounds greater than 4000 Hz. Figure 5 As shown, the frequency response curve of the bone conduction earphone may have two resonance peaks (510 and 520) in the low frequency region, and a first high frequency valley 530, a first high frequency peak 540 and a second high frequency peak 550 in the high frequency region. The two resonance peaks (510 and 520) in the low frequency region may be generated by the vibration transmission plate and the earphone fixing component. The first high frequency valley 530 and the first high frequency peak 540 may be generated by the deformation of the side of the housing at high frequency, and the second high frequency peak 550 may be generated by the deformation of the housing panel at high frequency.

[0122] The positions of the different resonance peaks and high-frequency peaks / valleys are related to the stiffness of the corresponding components. The stiffness is what is commonly referred to as the degree of hardness and softness, which is the ability of a material or structure to resist elastic deformation when subjected to force. The stiffness is related to the Young's modulus of the material itself and the structural dimensions. The greater the stiffness, the smaller the deformation of the structure when subjected to force. As mentioned above, the frequency response from 500 to 6000 Hz is particularly critical for bone conduction headphones. Within this frequency range, sharp peaks and valleys are not desired. The flatter the frequency response curve, the better the sound quality of the headphones. In some embodiments, the peaks and valleys in the high-frequency zone can be adjusted to a higher-frequency area by adjusting the stiffness of the outer shell panel and the back of the outer shell.

[0123] Figure 6 Schematic diagram of the low frequency band portion of the frequency response curve of the bone conduction speaker at different angles θ provided by the present invention. Figure 6As shown, the panel contacts the skin and transmits vibration to the skin. In this process, the skin will also affect the vibration of the bone conduction speaker, thereby affecting 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 under the same driving force, and for the corresponding bone conduction speaker, it is equivalent to the elasticity of the skin relative to its panel part. It can be further understood that when the straight line where the driving force of the driving device is located forms a certain angle θ with the normal of the area on the panel that contacts or abuts the user's body, especially when the angle θ increases, the resonance peak of the low-frequency area in the frequency response curve can be adjusted to a lower frequency area, so that the low frequency dives deeper and the low frequency increases. Compared with other technical means to increase the low-frequency components of the sound, such as adding a vibration transmission plate to the bone conduction speaker, setting the angle can effectively suppress the increase of vibration while increasing the low-frequency energy, thereby reducing the vibration relatively, so that the low-frequency sensitivity of the bone conduction speaker is significantly improved, and the sound quality and human experience are improved. It should be noted that, in some embodiments, the increase in low frequency and the decrease in vibration can be manifested as the increase in the angle θ within the range of (0, 90°), the energy in the low frequency range in the vibration or sound signal increases, and the vibration sense also increases, but the degree of increase in the energy in the low frequency range is greater than the degree of increase in the vibration sense. Therefore, in terms of relative effect, the vibration sense is relatively reduced.

[0124] from Figure 6 It can be seen that when the angle is larger, the resonance peak in the low-frequency zone appears in a lower frequency band, which can extend the flat part of the frequency curvature in disguise, thereby improving the sound quality of the headphones.

[0125] Figure 7 Schematic diagram of the high frequency band of the frequency response curve of the bone conduction speaker with different panel and housing materials provided by the present invention. Figure 7 As shown, when the material of the panel and the shell is harder, the frequencies corresponding to the first and second high-frequency peaks are higher; when the material of the panel and the shell is softer, the frequencies corresponding to the first and second high-frequency peaks are lower than when the material of the panel and the shell is harder. Moreover, when the material of the panel and the shell is harder, the frequency corresponding to the first high-frequency valley is higher; when the material of the panel and the shell is softer, the frequency corresponding to the first high-frequency valley is lower than when the material of the panel and the shell is harder. It can be found that the rigid (harder) material of the panel and the shell can increase the frequency value corresponding to the appearance of the high-frequency peak / valley. According to Figure 5 From the description, we can see that the frequency response from 1000 to 10000 Hz is particularly critical for bone conduction headphones. In this frequency range, sharp peaks and valleys are not desired. The flatter the frequency response curve, the better the sound quality of the headphones. Figure 7 The rigid (harder) material of the panel and shell can extend the flat part of the frequency curvature in disguise, thereby improving the sound quality of the headphones.

[0126] In some embodiments, the stiffness of different components (e.g., housing, transmission assembly, and drive device, etc.) is related to the Young's modulus, thickness, size, etc. of their materials. The following is an example of the relationship between the stiffness of the housing and its material. In some embodiments, the housing may include a housing panel, a housing back, and a housing side. The housing panel, the housing back, and the housing side may be made of the same material or different materials. For example, the housing back and the housing panel may be made of the same material, and the housing side may be made of other materials. In some embodiments, under the condition that the size remains unchanged, the greater the Young's modulus of the housing material, the greater the stiffness of the housing, and the peaks and valleys of the frequency response curve of the earphone will change toward the high frequency direction, which is conducive to adjusting the peaks and valleys of the high frequency to higher frequencies. In some embodiments, the peaks and valleys of the frequency response curve at high frequencies can be adjusted to higher frequencies by adjusting the Young's modulus of the housing material. In some embodiments, using materials with specific Young's modulus, the Young's modulus of the shell can be greater than 2000 MPa, preferably, the Young's modulus of the shell can be greater than 4000 MPa, preferably, the Young's modulus of the shell is greater than 6000 MPa, preferably, the Young's modulus of the shell is greater than 8000 MPa, preferably, the Young's modulus of the shell is greater than 12000 MPa, more preferably, the Young's modulus of the shell is greater than 15000 MPa, and further preferably, the Young's modulus of the shell is greater than 18000 MPa.

[0127] In some embodiments, by adjusting the rigidity of the housing, the high-frequency peak-valley frequency in the frequency response curve of the bone conduction earphone can be made not less than 1000 Hz, preferably, the high-frequency peak-valley frequency can be made not less than 2000 Hz, preferably, the high-frequency peak-valley frequency can be made not less than 4000 Hz, preferably, the high-frequency peak-valley frequency can be made not less than 6000 Hz, more preferably, the high-frequency peak-valley frequency can be made not less than 8000 Hz, more preferably, the high-frequency peak-valley frequency can be made not less than 10000 Hz, more preferably, the high-frequency peak-valley frequency can be made not less than 12000 Hz, further preferably, the high-frequency peak-valley frequency can be made not less than 14000 Hz, further preferably, the high-frequency peak-valley frequency can be made not less than 16000 Hz, further preferably, the high-frequency peak-valley frequency can be made not less than 18000 Hz, further preferably, the high-frequency peak-valley frequency can be made not less than 20000 Hz. In some embodiments, by adjusting the rigidity of the housing, the high-frequency peak-valley frequency in the frequency response curve of the bone conduction earphone can be made to be outside the hearing range of the human ear. In some embodiments, by adjusting the stiffness of the housing, the high-frequency peak and valley frequencies in the frequency response curve of the earphone can be placed within the hearing range of the human ear. In some embodiments, when there are multiple high-frequency peaks / valleys, by adjusting the stiffness of the housing, one or more high-frequency peak / valley frequencies in the frequency response curve of the bone conduction earphone can be placed outside the hearing range of the human ear, and the remaining one or more high-frequency peak / valley frequencies can be placed within the hearing range of the human ear. For example, the second high-frequency peak can be placed outside the hearing range of the human ear, and the first high-frequency valley and the first high-frequency peak can be placed within the hearing range of the human ear.

[0128] In some embodiments, the rigidity of the shell can be improved by changing the connection mode of the shell panel, the back of the shell and the side of the shell to ensure that the shell as a whole has greater rigidity. In some embodiments, the shell panel, the back of the shell and the side of the shell can be integrally formed. In some embodiments, the back of the shell and the side of the shell can be an integrally formed structure. The shell panel and the side of the shell can be directly fixed by glue, or fixed by clamping or welding. The glue can be a glue with strong viscosity and high hardness. In some embodiments, the shell panel and the side of the shell can be an integrally formed structure, and the back of the shell and the side of the shell can be directly fixed by glue, or fixed by clamping or welding. The glue can be a glue with strong viscosity and high hardness. In some embodiments, the shell panel, the back of the shell and the side of the shell are independent components, and the three can be fixedly connected by one or any combination of glue, clamping or welding. For example, the shell panel and the side of the shell are connected by glue, and the back of the shell and the side of the shell are connected by clamping or welding. Or the back of the shell and the side of the shell are connected by glue, and the shell panel and the side of the shell are connected by clamping or welding.

[0129] In some embodiments, the overall rigidity of the shell can be improved by selecting materials with different Young's modulus. In some embodiments, the shell panel, the back of the shell and the side of the shell can all be made of a material. In some embodiments, the shell panel, the back of the shell and the side of the shell can be made of different materials, and the different materials can have the same Young's modulus or different Young's modulus. In some embodiments, the shell panel and the back of the shell are made of the same material, and the side of the shell is made of other materials, and the Young's modulus of the two materials can be the same or different. For example, the Young's modulus of the material of the side of the shell can be greater than the Young's modulus of the material of the shell panel and the back of the shell, or the Young's modulus of the material of the side of the shell can be less than the Young's modulus of the material of the shell panel and the back of the shell. In some embodiments, the shell panel and the side of the shell are made of the same material, and the back of the shell is made of other materials, and the Young's modulus of the two materials can be the same or different. For example, the Young's modulus of the material of the back of the shell can be greater than the Young's modulus of the material of the shell panel and the back of the shell, or the Young's modulus of the material of the back of the shell can be less than the Young's modulus of the material of the shell panel and the back of the shell. In some embodiments, the back of the shell and the side of the shell are made of the same material, and the shell panel is made of other materials, and the Young's modulus of the two materials can be the same or different. For example, the Young's modulus of the material of the shell panel can be greater than the Young's modulus of the material of the back of the shell and the side of the shell, or the Young's modulus of the material of the shell panel can be less than the Young's modulus of the material of the back of the shell and the side of the shell. In some embodiments, the materials of the shell panel, the back of the shell and the side of the shell are different, and the Young's modulus of the three materials can be all the same or completely different, and the Young's modulus of the three materials are all greater than 2000MPa.

[0130] In some embodiments, the stiffness of the vibration transmission plate and the earphone fixing assembly can be adjusted so that the two resonance peak frequencies in the low-frequency zone of the bone conduction earphone are both less than 2000 Hz. Preferably, the two resonance peak frequencies in the low-frequency zone of the bone conduction earphone can be both less than 1000 Hz. More preferably, the two resonance peak frequencies in the low-frequency zone of the bone conduction earphone can be both less than 500 Hz.

[0131] In some embodiments, the present application can adjust the stiffness of various components of the bone conduction earphone (for example, the housing, the housing bracket, the vibration transducer or the earphone fixing assembly) to adjust the peaks and valleys of the high-frequency region to higher frequencies and the low-frequency resonance peaks to low frequencies, thereby ensuring a frequency response curve platform within the range of 1000Hz to 10000Hz and improving the sound quality of the bone conduction earphone.

[0132] On the other hand, bone conduction headphones will leak sound during the vibration transmission process. The sound leakage refers to the vibration of the internal components of the bone conduction headphones or the vibration of the outer shell, which will cause the volume of the surrounding air to change, so that the surrounding air forms a compression area or a sparse area and spreads around, resulting in the transmission of sound to the surrounding environment, so that people other than the wearer of the bone conduction headphones can hear the sound emitted by the headphones. The present application can provide a solution to reduce the sound leakage of bone conduction headphones from the perspective of changing the shell structure, stiffness, etc.

[0133] In some embodiments, the sound leakage of the bone conduction speaker can be further effectively reduced by a carefully designed vibration generating part including a vibration transfer layer (not shown). Preferably, drilling holes on the surface of the vibration transfer layer can reduce sound leakage. For example, the vibration transfer layer is bonded to the panel through glue, and the bonding area of ​​the vibration transfer layer with the panel is higher than the non-bonding area on the vibration transfer layer, and there is a cavity below the non-bonding area. Sound-introducing holes are respectively provided in the non-bonding area on the vibration transfer layer and the surface of the shell. Preferably, the non-bonding area with some sound-introducing holes does not contact the user. On the one hand, the sound-introducing holes can effectively reduce the area of ​​the non-bonding area on the vibration transfer layer, and can make the air inside and outside the vibration transfer layer permeable, reduce the pressure difference between the inside and outside, and thus reduce the vibration of the non-bonding area; on the other hand, the sound-introducing holes can lead the sound waves formed by the vibration of the air inside the shell to the outside of the shell, and cancel the sound leakage sound waves formed by the vibration of the shell pushing the air outside the shell, so as to reduce the amplitude of the sound leakage sound waves.

[0134] In some embodiments, the method of setting the direction of the driving force generated by the driving device to have an angle with the direction of the panel is not unique. Figure 8-Figure 16 The method of setting the driving device and the panel is exemplified from different embodiment angles. Embodiment 1

[0135] Figure 8 FIG. 1 is a schematic diagram of the axial cross-sectional structure of the bone conduction speaker according to the first embodiment of the present invention. Figure 8 As shown, in some embodiments, the bone conduction speaker 800 includes a panel 801, a housing 802, a first transmission component 803, a coil 804, a vibration-transmitting plate 805, and a magnetic circuit component 806. The panel 801 and the housing 802 form a closed or quasi-closed cavity, and the driving device including the first transmission component 803, the coil 804, the vibration-transmitting plate 805 and the magnetic circuit component 806 is located in the cavity.

[0136] In some embodiments, the coil 804 and the magnetic circuit assembly 806 are both annular structures. In some embodiments, the coil 804 and the magnetic circuit assembly 806 have axes that are parallel to each other. The axis of the driving device refers to the axis of the coil 804 and / or the magnetic circuit assembly 806. The axis of the driving device and the normal of the area on the panel that contacts or abuts the user's body form the angle θ, 0<θ<90°. Specifically, the axis of the driving device and the normal of the area on the panel that contacts or abuts the user's body form the angle θ. For the axis of the coil 804 or the magnetic circuit assembly 806 and its spatial relationship with the normal, please refer to Figure 3 The relevant instructions in will not be repeated here.

[0137] In some embodiments, a portion of the first transmission component 803 is an annular structure that is compatible with the structure of the coil 804, and the annular structure is connected to one end face of the coil 804, and another portion of the first transmission component 803 is a connecting rod, and the connecting rod is connected to the panel and / or the housing. The coil 804 is fully or partially sleeved in the magnetic gap of the magnetic circuit component 806. The coil 804 is fully or partially sleeved in the annular groove of the magnetic circuit component 806. In this embodiment, an annular end face of the magnetic circuit component 806 is connected to the outer edge of the vibration transmission plate 805, and the first transmission component 803 passes through the middle area of ​​the vibration transmission plate 805 and is fixedly connected thereto.

[0138] After being energized, the coil 804 generates an Ampere force and vibrates in the magnetic field generated by the magnetic circuit assembly 806, and transmits the vibration of the coil 804 to the panel 801 through the first transmission assembly 803, and vibrates through the reaction force received by the magnetic circuit assembly 806, and directly transmits the vibration generated by the magnetic circuit assembly 806 to the first transmission assembly 803 through the vibration transmission piece 805, and then transmits it to the panel 801, and then transmits the vibration of the coil 804 and the vibration of the magnetic circuit assembly 806 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 piece is directly connected to the magnetic circuit assembly 806 and the first transmission assembly 803, the vibration generated by the magnetic circuit assembly 806 is directly transmitted to the panel through the first transmission assembly 803, and then, the vibration generated by the coil 804 and the vibration generated by the magnetic circuit assembly 806 form a composite vibration and are transmitted to the panel 801, and then when the composite vibration is transmitted to the skin and bones of the human body through the panel 801, people can hear the bone conduction sound. Embodiment 2

[0139] Fig. 9A: is a schematic diagram of the axial cross-sectional structure of the bone conduction speaker shown in the second embodiment of the present invention. The bone conduction speaker 900a includes a panel 901, a housing 902, a first transmission component 903, a coil 904, a vibration transmission plate 905, a second transmission component 906, and a magnetic circuit component 907. Among them, the first transmission component 903 is a hollow cylinder, one end face of the first transmission component 903 is connected to the panel 901, and the other end face of the first transmission component 903 is connected to one end face of the coil 904. The whole or part of the coil 904 is sleeved in the annular groove or magnetic gap of the magnetic circuit component 907. It should be understood that the coil 904 and the magnetic circuit component 907 are both annular structures. In some embodiments, the coil 904 and the magnetic circuit component 907 have mutually parallel axes. The spatial relationship between the axis of the coil 904 or the magnetic circuit component 907 and the normal of the area on the panel for contacting or abutting against the user's body can be seen in Figure 3 The center or the area near the center of the magnetic circuit component 907 is connected to one end of the second transmission component 906, and the other end of the second transmission component 906 is connected to the center or the area near the center of the vibration transmission plate 905. The outer edge of the vibration transmission plate 905 is connected to the inner side of the flange of the first transmission component 903. The connection method includes but is not limited to clamping, hot pressing, bonding, or injection molding.

[0140] In this embodiment, the coil 904 after being energized generates an Ampere force and vibrates in the magnetic field generated by the magnetic circuit assembly 907, and the vibration of the coil 904 is transmitted to the panel 901 through the first transmission assembly 903, and the magnetic circuit assembly 907 vibrates through the reaction force received, and the vibration generated by the magnetic circuit assembly 907 is transmitted to the panel 901 through the second transmission assembly 906, the vibration transmission sheet 905 and the first transmission assembly 903, and then the vibration of the coil 904 and the vibration of the magnetic circuit assembly 907 are transmitted to the skin and bones of the human body through the panel 901, so that people can hear the sound. In short, the vibration generated by the coil 904 and the vibration generated by the magnetic circuit assembly 907 form a composite vibration and are transmitted to the panel 901, and then the composite vibration is transmitted to the skin and bones of the human body through the panel 901, so that people can hear the bone conduction sound.

[0141] Fig. 9A The embodiment shown is Figure 8 Compared with the embodiment shown in the figure, the difference is that the first transmission component is changed from a connecting rod to a hollow cylindrical structure, so that the combination of the first transmission component and the coil is more complete and the structure is more stable. At the same time, the frequency of the high-order mode generated by the speaker (that is, the vibration of different points on the speaker is inconsistent) is increased, and the low-frequency resonance peak of the frequency response curve of the bone conduction speaker can be moved to a lower frequency, making the flat area of ​​the frequency response curve wider, thereby improving the sound quality of the speaker.

[0142] Fig. 9Bis a schematic diagram of the disassembled structure of the components of a bone conduction speaker shown in a product example of the second embodiment of the present invention, Fig. 9C yes Fig. 9B The longitudinal cross-sectional structure diagram of the bone conduction speaker is shown. Fig. 9B , 9C The structure and Fig. 9A correspond.

[0143] like Fig. 9B As shown, the bone conduction speaker 900b includes a vibration plate and face-attaching silicone assembly 910, a bracket and a vibration transmission plate 911, a coil 912, a connector 913, a bolt and nut assembly 914, an upper magnet 915, a magnetic plate 916, a lower magnet 917, a magnetic cover 918, a multi-function button PCB 919, a multi-function button silicone 920, a speaker shell 921, an ear-hook multi-function button 922, and an ear-hook 923. Fig. 9C As shown, the vibration plate and face-fitting silicone assembly 910 further includes face-fitting silicone 9101 and a vibration plate 9102. The bracket and vibration transmission plate 911 further include a bracket 9111 and a vibration transmission plate 9112. The bolt and nut assembly 914 further includes a bolt 9141 and a nut 9142. Among them, the vibration plate 9102 can be functionally equivalent to the aforementioned panel, and the face-fitting silicone 9101 is equivalent to the soft material covering the panel. It can be understood that the face-fitting silicone 9101 is not a necessary component and can be omitted in some embodiments. The bracket 9111 can be equivalent to the aforementioned first transmission assembly. The connecting member 913 can be equivalent to the aforementioned second transmission assembly. The speaker shell 921 can be equivalent to the aforementioned shell.

[0144] Reference Fig. 9C , the vibration plate and the face-fitting silicone assembly 910 are combined with the speaker housing 921 to form a closed or quasi-closed cavity to accommodate components such as the magnetic circuit assembly and the transmission assembly. The magnetic cover 918 is a concave structure, specifically, including a bottom plate and side walls. The upper magnet 915, the magnetic plate 916 and the lower magnet 917 are stacked from top to bottom on the bottom plate of the magnetic cover 918. Through holes are respectively provided on the upper magnet 915, the magnetic plate 916, the lower magnet 917 and the magnetic cover 918, which are assembled together with bolts and nuts 914 to form a magnetic circuit assembly. A magnetic gap is formed between the magnetic cover 918 and the upper magnet 915, the magnetic plate 916 and the lower magnet 917 arranged on its bottom plate. The coil 912 is partially or fully arranged in the magnetic gap. As Fig.9D , 9EAs shown, the bracket 9111 may have an annular structure with uneven thickness, specifically, one side is thicker than the other side, the size and size of one end face of the bracket 9111 is adapted to the coil 912, and is connected to one end face of the coil 912, and the other end of the bracket 9111 is against or connected to the vibration plate and the face-attaching silicone component 910. The structure of the bracket 9111 with one side thicker than the other side can tilt the drive device relative to the vibration plate and the face-attaching silicone component 910, thereby ensuring that the axis of the drive device (or the direction of the driving force) and the normal of the contact surface (the surface in contact with human skin) of the vibrating face-attaching silicone component 910 have an angle θ. The connector 913 connects the upper magnet 915 in the magnetic circuit assembly with the vibration transmission piece 9112, and at the same time plays the function of transmitting vibration. The specific connection methods include but are not limited to: bolt connection, bonding, welding, etc. The edge of the vibration transmission piece 9112 is clamped to the inner side of the bracket 9111. The bracket 9111 also has the function of transmitting the vibration of the coil and the magnetic circuit assembly to the vibration plate and the face-mounted silicone assembly 910. The outer edge of the bracket can be inserted into the groove or limit slot on the inner wall of the speaker housing 921, and then fixed in the cavity, so that the bracket can realize transmission while also starting the function of suspending or supporting the entire drive device.

[0145] Fig.9D , 9E Schematic diagram of the structure of the support in the bone conduction speaker provided by some specific embodiments of the present invention. Fig.9D , 9E As shown, only as an example, the bracket 9111 has a body 91111 of an annular structure, and the body can be an annular sheet structure, and an annular facade 91112 adapted to the shape of the body is provided on the body, and one side of the facade 91112 is lower than the other side thereof (for example, the facade A side is lower than the facade B side), and the high and low sides can be transitioned through the connecting parts C and D with continuous height changes, or the connecting parts with discontinuous height changes can be transitioned, such as the connecting parts C and D are configured as a step-type structure with discontinuous height changes. It should be noted that the A side, the B side, the connecting part C, and the connecting part D can be regarded as four different parts of the inside 91112, which can be integrally formed with each other, without obvious boundaries in structure, or the A side, the B side, the connecting part C, and the connecting part D are structurally independent of each other, and are assembled together through an additional connection process. The specific connection process can be bonding, welding, hot melt connection, etc. The bracket 9111 is used to connect the coil with the vibration plate and the face-mounted silicone assembly 910 to achieve vibration transmission. Specifically, the bottom end surface of the bracket body 91111 can be fixedly connected to the upper end surface of the coil, and the upper end surface of the vertical surface 91112 is against or connected to the vibration plate and the face-mounted silicone component 910 (see Fig. 9C). In some embodiments, the distance between the vibration plate and the face-attaching silicone assembly 910 and the driving device (such as a coil) is far, so that the height of the facade is relatively large. If the facade 91112 is thin, the strength is low and it is easy to be damaged; if the facade 91112 is thick and heavy, it will affect the transmission and thus the sound quality. Therefore, in some embodiments, a number of reinforcing ribs 91113 can be provided on the outside or inside of the facade 91112, which can ensure the strength of the facade 91112 without affecting the sound quality. In some embodiments, the reinforcing rib 91113 can be a smaller facade perpendicular to the facade 91112, one end face of which is connected to the body 91111, and the other end face of which is connected to the facade 91112. The connection method includes but is not limited to bonding, welding, thermoplastic molding or integral molding. In some embodiments, the reinforcing rib 91113 can also be a short support rod, which is diagonally supported between the facade and the body, one end of the support rod is connected to the body 91111, and the other end is connected to the facade 91112. The connection methods include but are not limited to bonding, welding, thermoplastic molding or integral molding. Embodiment 3

[0146] Fig.10 1 is a schematic diagram of the axial cross-sectional structure of the bone conduction speaker shown in the third embodiment of the present invention. Compared with the bone conduction speaker 1000, the difference of the bone conduction speaker 1000 lies in the installation position and length of the first transmission component 1003. The first transmission component 1003 can be a plurality of connecting rods or connecting columns, one end of some connecting rods is connected to the panel 1001, one end of another part of the connecting rods is connected to the first side surface 1002 of the shell, and the other end of each connecting rod is connected to one end face of the coil 1004. That is, each connecting rod is distributed along the circumference of the coil 1004 between the coil and the panel and / or the shell, and the connecting rods can be distributed at equal intervals or at unequal intervals. As a variation 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 is adapted to the size and shape of the coil. The first end face of the first transmission component 1003 is connected to one end face of the coil, a part of the second end face of the first transmission component 1003 is connected to the panel 1001, and the other part is connected to the shell 1002.

[0147] Compared with the bone conduction speaker 900, the length of the first transmission component 1003 in the bone conduction speaker 1000 is shorter, which helps to further increase the frequency of the speaker's high-order modes (i.e., the vibrations at different points on the speaker are inconsistent). Embodiment 4

[0148] Fig.11 FIG. 1 is a schematic diagram of the axial cross-sectional structure of the bone conduction speaker according to the fourth embodiment of the present invention. Fig.11The bone conduction speaker 1100 shown includes a driving device 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 column. The transmission component 1102 is connected between the driving device 1101 and the panel 1103 as a transmission path to transmit the vibration or driving force generated by the driving device 1101 to the panel 1103. In some embodiments, since the distance between the panel and the driving device is relatively far, a longer transmission path is required. In turn, the length of the transmission component is also required to be relatively long, for example, the length of the connecting rod or the connecting column is required to be relatively long. If the structure of the transmission component is relatively thin, the strength will be relatively low, and long-term vibration will damage it; if the structure of the transmission component is set to be relatively thick and thick in order to overcome this problem, it will affect the transmission of vibration, and thus affect the sound quality. In some embodiments, additional reinforcing ribs 1104 may be provided on the surface of the transmission component to increase the strength of the transmission component, while having less impact on the structure of the transmission component. In some embodiments, the reinforcing ribs 1104 may be facades, ridges, or support rods, etc. The connection method between the reinforcing rib 1104 and the transmission component 1102 includes but is not limited to bonding, welding, hot-melt connection or integral molding. In some embodiments, a plurality of reinforcing ribs 1104 can be provided on the surface of the transmission component. For an annular transmission component, the reinforcing ribs can be distributed around the circumference of the transmission component at equal or unequal intervals. For a more detailed description of the reinforcing ribs, please refer to other relevant contents in the text (such as Fig.9D , 9E ).

[0149] Fig.11 Compared with other embodiments, the bone conduction speaker 1100 shown has additional reinforcing ribs 1104 on the transmission component, which can increase the strength of the transmission component and increase the frequency of the higher-order modes generated by the speaker (i.e., the vibrations at different points on the speaker are inconsistent), thereby improving the sound quality. Embodiment 5

[0150] Fig.12 FIG. 1 is a schematic diagram of the axial cross-sectional structure of the bone conduction speaker according to the fifth embodiment of the present invention. Fig.12 As shown, in some embodiments, one end of the first transmission assembly 1203 of the bone conduction speaker 1200 is connected to the bottom surface of the housing 1202, that is, the entire driving device is fixed on the housing 1202 at an angle relative to the panel.

[0151] Specifically, the housing 1202 and the panel 1201 both have relatively high hardness, and the two are integrally formed or connected by a relatively rigid connecting medium. After power is turned on, the vibration generated by the coil 1204 and the vibration generated by the magnetic circuit assembly 1207 form a composite vibration that is transmitted to the housing 1202, and then to the panel 1201. When the composite vibration is transmitted to the skin and bones of the human body through the panel 1201, the human body can hear bone conduction sound. Embodiment 6

[0152] Fig.13 FIG. 1 is a schematic diagram of the axial cross-sectional structure of the bone conduction speaker according to the sixth embodiment of the present invention. Fig.13 As shown, in some other embodiments, the bone conduction speaker 1300 includes a housing 1302, a panel 1301 independently provided from the housing, and a driving device including a first transmission component 1303, a coil 1304, a vibration transmission sheet 1305, a second transmission component 1306, and a magnetic circuit component 1307. The housing 1302 includes a first housing 13021 and a third transmission component 13022. The first housing 13021 is a rectangular parallelepiped with a cavity. In other embodiments, the first housing 13021 can also be a closed cylinder, a sphere, etc. with a cavity. The driving device is provided in the cavity, and the internal structure of the driving device can be any one of the aforementioned embodiments.

[0153] The upper side of the first housing 13021 is connected to the upper side of the panel 1301 through the third transmission assembly 13022, and the lower side of the first housing 13021 is directly connected to the lower side of the panel 1301. The connection method between the first housing 13021 and the panel 1301 is not limited to the aforementioned method. For example, the lower side of the first housing 13021 can be connected to the lower side of the panel 1301 through the third transmission assembly 13022, and the upper side of the first housing 13021 can be directly connected to the upper side of the panel 1301. For example, only the middle area of ​​the first housing 13021 is connected to the panel through the third transmission assembly. The third transmission assembly can be a rod-shaped, plate-shaped, hollow column-shaped, etc.

[0154] In this embodiment, after being energized, the coil 1304 generates an Ampere force and vibrates in the magnetic field generated by the magnetic circuit component 1307, and the vibration of the coil 1304 is transmitted to the first shell 13021 through the first transmission component 1303. The first shell 13021 transmits the vibration to the panel 1301 through the third transmission component 13022 or directly, and vibrates due to the reaction force exerted on the magnetic circuit component 1307. The vibration generated by the magnetic circuit component 1307 is transmitted to the first shell 13021 through the connection of the second transmission component 1306 and the vibration transmission plate 1305. The first shell 13021 transmits the vibration to the panel 1301 through the third transmission component 13022 or directly, and then the vibration of the coil 1304 and the vibration of the magnetic circuit component 1307 are transmitted to the skin and bones of the human body through the panel 1301, so that people can hear the sound. Simply put, the vibration generated by the coil 1304 and the vibration generated by the magnetic circuit assembly 1307 form a composite vibration which is first transmitted to the first shell 13021, and then directly transmitted to the panel 1301 or transmitted to the panel 1301 through the third transmission assembly 13022, and then the composite vibration is transmitted to the skin and bones of the human body through the panel 1301, so that people can hear bone conduction sound. Embodiment 7

[0155] Fig.14 FIG. 1 is a schematic diagram of the axial cross-sectional structure of the bone conduction speaker according to the seventh embodiment of the present invention. Fig.14 The bone conduction speaker 1400 shown has a first transmission path and a second transmission path that are independent of each other. Specifically, the first transmission path includes a first transmission component 1403, and the transmission component on the second transmission path includes a vibration transmission piece 1405 and a second transmission component 1406. The bone conduction speaker 1400 has a first transmission path and a second transmission path that are independent of each other, which can be understood as there is no common transmission component in the two transmission paths.

[0156] like Fig.14As shown, the bone conduction speaker 1400 includes a panel 1401, a housing 1402, a first transmission component 1403, a coil 1404, a vibration-transmitting plate 1405, a second transmission component 1406, and a magnetic circuit component 1407. The panel 1401 and the housing 1402 form a closed or quasi-closed cavity, and a driving device including the first transmission component 1403, the coil 1404, the vibration-transmitting plate 1405, the second transmission component 1406, and the magnetic circuit component 1407 is located in the cavity. The axis of the driving device and the normal of the area where the panel contacts or abuts against the user's body form the angle, 0<θ<90°. The bottom surface of the magnetic circuit component 1407 is connected to the vibration transmission plate 1405 through the second transmission component 1406, and the outer edge of the vibration transmission plate 1405 is connected to the outer shell 1402. For example, the outer edge of the vibration transmission plate 1405 can be connected to the bottom surface of the outer shell 1402, or to the side of the outer shell 1402, or one part can be connected to the bottom surface of the outer shell 1402, and the other part can be connected to the side of the outer shell 1402.

[0157] In this embodiment, the coil 1404 after being energized generates an Ampere force and vibrates in the magnetic field generated by the magnetic circuit assembly 1407, and the vibration of the coil 1404 is transmitted to the panel 1401 through the first transmission assembly 1403. The reaction force received by the magnetic circuit assembly 1407 causes vibration, and the vibration generated by the magnetic circuit assembly 1407 is transmitted to the bottom and side surfaces of the housing 1402 through the second transmission assembly 1406 and the vibration sheet 1405, and the housing then transmits the vibration of the magnetic circuit assembly 1407 to the panel 1401. Finally, the vibration of the coil 1404 and the vibration of the magnetic circuit assembly 1407 are transmitted to the skin and bones of the human body through the panel 1401, so that the person can hear the sound. It can be understood that since the vibration transmission piece is directly connected to the shell 1402, the magnetic circuit assembly and the shell 1402 are softly connected, and the vibration generated by the magnetic circuit assembly 1407 is directly transmitted to the bottom surface of the shell 1402 and one side surface of the shell 1402. The vibration generated by the coil 1404 and the vibration generated by the magnetic circuit assembly 1407 form a composite vibration that is transmitted to the panel 1401, and then the composite vibration is transmitted to the skin and bones of the human body through the panel 1401, so that people can hear the bone conduction sound. Embodiment 8

[0158] Fig.15 It is a schematic diagram of the axial cross-sectional structure of the bone conduction speaker shown in the eighth embodiment of the present invention. Fig.15 The bone conduction speaker 1500 shown in the figure adopts a dual-vibration plate structure, and the low-frequency region of the speaker vibration frequency response curve has an additional peak, making the speaker's low-frequency response more sensitive, thereby improving the sound quality. Fig.15As shown, the bone conduction speaker 1500 includes a panel 1501, a housing 1502, a first transmission component 1503, a coil 1504, a first vibration transmission piece 1505, a second vibration transmission piece 1506, a second transmission component 1507, and a magnetic circuit component 1508. The connection method between the panel 1501, the first transmission component 1507, the first vibration transmission piece 1505, the second transmission component 1507, and the magnetic circuit component 1508 is the same as the connection method shown in FIG9, and specifically refer to FIG9. The edge of the second vibration transmission piece 1506 is connected to the open end face of the housing 1502, and the first transmission component 1503 passes through the middle area of ​​the second vibration transmission piece 1506 and is fixedly connected thereto. The central axis surface of the second vibration transmission piece 1506 is clamped on the solid columnar body of the first transmission component 1503.

[0159] The working principle of the bone conduction speaker 1500 of this embodiment is specifically as follows: the coil 1504 after being energized generates an Ampere force and vibrates in the magnetic field generated by the magnetic circuit component 1508, and the vibration of the coil 1504 is directly transmitted to the panel 1501 through the first transmission component 1503. The reaction force exerted on the magnetic circuit component 1508 causes it to vibrate, and the vibration generated by the magnetic circuit component 1508 is transmitted to the panel 1501 through the second transmission component 1507 and the first vibration transmission plate 1505. The vibration of the housing 1502 is transmitted to the panel 1501 via the second vibration plate, and then the vibration of the coil 1504 and the vibration of the magnetic circuit component 1508 are transmitted to the skin and bones of the human body through the panel 1501, so that people can hear the sound. It can be understood that the soft connection between the panel 1501 and the shell 1502 is achieved through the second vibration transmission piece 1506, and the vibration generated by the coil 1504 and the vibration generated by the magnetic circuit assembly 1508 form a composite vibration which is simultaneously transmitted to the panel 1501 and the shell 1502, and then the composite vibration is transmitted to the skin and bones of the human body through the panel 1501, so that people can hear bone conduction sound. Embodiment 9

[0160] Fig.16 FIG. 1 is a schematic diagram of the axial cross-sectional structure of the bone conduction speaker according to the ninth embodiment of the present invention. Fig.16As shown, in another embodiment, the bone conduction speaker 1600 includes a panel 1601, a housing 1602, and two driving devices 1605 and 1606. The panel 1601 and the housing 1602 form a closed or quasi-closed cavity, and the two driving devices 1605 and 1606 are located inside the cavity. The driving device in this embodiment can be the driving device in the aforementioned embodiments of the present invention. Among them, the driving device 1605 is connected to the panel 1601 through the first transmission component 1603; the driving device 1606 is connected to the partition provided in the cavity through the second transmission component 1604. And there is a certain angle between the driving device 1605 and the driving device 1606. In other embodiments, the driving device 1606 can be directly connected to the panel or the housing through the second transmission component 1604 bent at a right angle. It should be noted that, in other embodiments, the axis of the driving device 1605 does not need to be parallel to the normal of the panel, and the axis of the driving device 1606 does not need to be perpendicular to the normal of the panel, but the positions of the two driving devices relative to the panel make the straight line where the direction of the resultant force of the driving force generated by them is located and the normal of the area on the panel used to contact or abut against the user's body is at the angle θ, 0<θ<90°. It can be further understood that there can be 3, 4 or even more driving devices, and the positions of each driving device in the cavity are adjusted so that the straight line where the direction of the resultant force of the driving force generated by each driving device is located and the normal of the area on the panel used to contact or abut against the user's body is at the angle θ, 0<θ<90°.

[0161] In this embodiment, the driving force of the driving device 1605 is parallel to the normal of the area on the panel used for contacting or abutting against the user's body, and the driving force of the driving device 1606 is perpendicular to the normal of the area on the panel used for contacting or abutting against the user's body. The two driving devices vibrate simultaneously and transfer the two vibrations to the panel, and then transmit the composite vibration to the skin and bones of the human body through the panel 1601, so that people can hear bone conduction sound.

[0162] The present invention also provides a bone conduction headset. During use, the headset stand / headphone strap fixes the bone conduction speaker at a specific part of the user (for example, the head) to provide a clamping force between the vibration unit and the user. The contact surface is connected to the driving device and keeps in contact with the user to transmit the sound to the user through vibration. If the bone conduction speaker is a symmetrical structure, and it is assumed that the driving forces provided by the driving devices on both sides are equal in magnitude and opposite in direction during operation, then the center point position on the headset stand / headphone strap 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 transducers are not equal in magnitude, or the bone conduction speaker is structurally asymmetric, then other points or areas on the headset stand / headphone strap or outside the headset stand / headphone strap can be selected as the equivalent fixed end. The fixed end mentioned here can be regarded as an equivalent end of the bone conduction speaker whose position is relatively fixed during the process of generating vibration. The fixed end and the vibration unit are connected through the headset stand / headphone strap, and the transmission relationship is related to the headset stand / headphone strap and the clamping force provided by the headset stand / headphone strap, and depends on the physical properties of the headset stand / headphone strap. Preferably, changing the clamping force provided by the headphone stand / headphone strap, the mass of the headphone stand / headphone strap and other physical quantities can change the sound transmission efficiency of the bone conduction speaker and affect the frequency response of the system within a specific frequency range. For example, a headphone stand / headphone strap made of a higher strength material and a headphone stand / headphone strap made of a lower strength material will provide different clamping forces, or changing the structure of the headphone stand / headphone strap and adding an auxiliary device that can provide elastic force to the headphone stand / headphone strap can also change the clamping force, thereby affecting the sound transmission efficiency; changes in the size of the headphone stand / headphone strap when worn will also affect the size of the clamping force, and the clamping force increases as the distance between the vibration units at both ends of the headphone stand / headphone strap increases.

[0163] In order to obtain an earphone stand / earphone strap that meets specific clamping force conditions, ordinary technicians in this field can choose materials with different rigidity and different modulus to make the earphone stand / earphone strap or adjust the size and size of the earphone stand / earphone strap according to actual conditions. It should be noted that the clamping force of the earphone stand / earphone strap will not only affect the sound transmission efficiency, but also affect the user's sound perception within the bass frequency range. The clamping force mentioned here is the pressure between the contact surface and the user. Preferably, the clamping force is between 0.1N-5N, more preferably, the clamping force is between 0.2N-4N, further preferably, the clamping force is between 0.2N-3N, more preferably, the clamping force is between 0.2N-1.5N, and further preferably, the clamping force is between 0.3N-1.5N.

[0164] It should be noted that the above-mentioned embodiments of the bone conduction speaker are only examples, and the components and structures described in these embodiments should not be used as limitations on the present invention. The components, shapes, structures and connection methods in these embodiments can be combined, for example Fig.11 The reinforcement ribs in Figure 9 can be applied to Fig.16 In any of the embodiments shown, the first transmission assembly 903 of the bone conduction speaker 900a in FIG9 can also be connected to the panel and the housing at the same time as the first transmission assembly 1003 of the bone conduction speaker 1000 , and can also be connected to the rear side of the housing as the bone conduction speaker 1200 .

[0165] Fig.17 1700 is a flow chart of a method for setting a bone conduction speaker according to the present invention. Flow 1700 is a flow chart of steps included in setting a bone conduction speaker according to a specific embodiment of the present invention.

[0166] In step 1710, the panel is connected to the driving device by transmission. In some embodiments, the driving device and the panel can be connected by transmission components such as vibration transmission plates and connectors. In addition to its structural connection function, the transmission component can also play a role in transmitting vibration. Specifically, the driving device includes a coil and a magnetic circuit component. The vibration of the coil and the magnetic circuit component can be transmitted to the panel and / or the housing via different paths. For example, the vibration of the coil can be transmitted to the panel and / or the housing through a first transmission path, and the vibration of the magnetic circuit component can be transmitted to the panel and / or the housing through a second transmission path. The first transmission path may include a first transmission component, and the second transmission path includes a second transmission component, a vibration transmission plate and a first transmission component. The first transmission component may be a connecting column or a connecting rod; the second transmission component may be a connecting column or a connecting rod.

[0167] In some embodiments, the bone conduction speaker can transmit the vibration generated by the driving device to the panel through a transmission assembly connecting the panel and the driving device, thereby further transmitting the vibration to the human body through the panel in contact with the human body. The transmission connection between the panel and the driving device can effectively transmit the vibration signal generated by the driving device, so that the human body can receive the signal. In some embodiments, the panel, the transmission assembly and the driving device are generally made of rigid materials and are rigidly connected to each other to improve the quality of the transmitted audio signal.

[0168] In step 1720, the relative position of the driving device and the panel can be set so that the straight line where the driving force generated by the driving device is located is not parallel to the normal line of the panel. Specifically, the relative position of the driving device and the panel can be set according to the forms of the various embodiments described above. Among them, the setting method adopted can change the structure of the transmission component, for example, the transmission component is set to a structure with one side lower than the other side to ensure that the straight line where the driving force is located is not parallel to the normal line of the panel; or the structure of the panel or the shell is improved to achieve the technical purpose, for example, a platform inclined relative to the panel is set in the shell, and the driving device is set on the platform, and for example, the driving device is set horizontally in the shell, and the panel is tilted to cover the shell. As long as the driving device can be tilted relative to the panel so that the straight line where the driving force is located is not parallel to the normal line of the area on the panel used to contact or abut against the user's body, any means can be applied to the present invention, and the present invention does not impose any restrictions on this.

[0169] It should be noted that there is no necessary order for the above two steps in the process of setting up the bone conduction speaker, and the order of the two steps can be swapped. In some embodiments, the above two steps are not completely separate processes, that is, the two steps can be performed at the same time. For example, the relative position relationship between the driving device and the panel is adjusted while the driving device is connected to the panel.

[0170] The basic concepts have been described above. Obviously, for those skilled in the art, the above invention disclosure is only used as an example and does not constitute a limitation of the present application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements and amendments to the present application. Such modifications, improvements and amendments are suggested in the present application, so such modifications, improvements and amendments still belong to the spirit and scope of the exemplary embodiments of the present application.

[0171] At the same time, the present application uses specific words to describe the embodiments of the present application. For example, "one embodiment", "an embodiment" and / or "some embodiments" refer to a certain feature, structure or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or more in different positions in this specification does not necessarily refer to the same embodiment. In addition, some features, structures or characteristics in one or more embodiments of the present application can be appropriately combined.

[0172] In addition, it will be appreciated by those skilled in the art that various aspects of the present application may be illustrated and described by a number of patentable categories or situations, including any new and useful process, machine, product or combination of substances or any new and useful improvements thereto. Accordingly, various aspects of the present application may be performed entirely by hardware, entirely by software (including firmware, resident software, microcode, etc.), or by a combination of hardware and software. The above hardware or software may all be referred to as "data blocks", "modules", "engines", "units", "components" or "systems". In addition, various aspects of the present application may be represented as a computer product located in one or more computer-readable media, the product including computer-readable program code.

[0173] In addition, unless explicitly stated in the claims, the order of the processing elements and sequences described in this application, the use of alphanumeric characters or other names, are not intended to limit the order of the processes and methods of this application. Although the above disclosure discusses some invention embodiments that are currently considered useful through various examples, it should be understood that such details are only for illustrative purposes, and the attached claims are not limited to the disclosed embodiments. On the contrary, the claims are intended to cover all modifications and equivalent combinations that are consistent with the essence and scope of the embodiments of this application. For example, although the system components described above can be implemented by hardware devices, they can also be implemented only by software solutions, such as installing the described system on an existing server or mobile device.

[0174] Similarly, it should be noted that in order to simplify the description of the disclosure of this application and thus help understand one or more embodiments of the invention, in the above description of the embodiments of this application, multiple features are sometimes combined into one embodiment, figure or description thereof. However, this disclosure method does not mean that the features required by the object of this application are more than the features mentioned in the claims. In fact, the features of the embodiments are less than all the features of the single embodiment disclosed above.

[0175] In some embodiments, numbers describing the number of components and attributes are used. It should be understood that such numbers used in the description of the embodiments are modified by modifiers such as "about", "approximately" or "substantially" in some examples. Unless otherwise specified, "about", "approximately" or "substantially" indicate that the numbers are allowed to vary by ± the indicated %. Accordingly, in some embodiments, the numerical data used in the specification and claims are approximate values, which may change according to the required features of individual embodiments. In some embodiments, the numerical data should take into account the specified significant digits and adopt the general method of retaining digits. Although the numerical domains and data used to confirm the breadth of their range in some embodiments of the present application are approximate values, in specific embodiments, the setting of such numerical values ​​is as accurate as possible within the feasible range.

[0176] Finally, it should be understood that the embodiments described in this application are only used to illustrate the principles of the embodiments of the present application. Other variations may also fall within the scope of the present application. Therefore, as an example and not a limitation, the alternative configurations of the embodiments of the present application may be considered to be consistent with the teachings of the present application. Accordingly, the embodiments of the present application are not limited to the embodiments explicitly introduced and described in the present application.

Claims

1. A bone conduction speaker, characterized in that: Including housing and drive device, The driving device is used to generate driving force; The housing comprises a panel and a vibration transmission layer, the panel is in transmission connection with the driving device, one side of the vibration transmission layer is attached to the outer side of the panel, and the other side of the vibration transmission layer is attached to the user to form a contact surface with the user's skin, wherein: When the straight line where the driving force is located is specified to have a positive direction pointing outside the bone conduction speaker through the contact surface, and the normal line of the contact surface is specified to have a positive direction pointing outside the bone conduction speaker, the angle formed by the straight line where the driving force is located and the normal line in their respective positive directions is an acute angle.

2. The bone conduction speaker according to claim 1, characterized in that: The axis of the driving device is not parallel to the normal line; The driving device comprises a coil and a magnetic circuit component, and the axis of the driving device is perpendicular to the radial plane of the coil and / or the radial plane of the magnetic circuit component.

3. The bone conduction speaker according to claim 1, characterized in that: The angle is any value between 5° and 80°, or the angle is any value between 15° and 70°, or the angle is any value between 25° and 60°, or the angle is any value between 28° and 50°, or the angle is any value between 30° and 39°, or the angle is any value between 31° and 38°, or the angle is any value between 32° and 37°, or the angle is any value between 33° and 36°, or the angle is any value between 33° and 35.8°, or the angle is any value between 33.5° and 35°.

4. The bone conduction speaker according to claim 3, characterized in that: The included angle is 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.

5. The bone conduction speaker according to claim 1, characterized in that: The driving device comprises a coil, a magnetic circuit assembly and a transmission assembly, wherein the transmission assembly is used to transmit the vibration of the coil and / or the magnetic circuit assembly to the panel.

6. The bone conduction speaker according to claim 5, characterized in that: The transmission assembly includes a first transmission assembly and a second transmission assembly. The vibration of the coil is transmitted to the panel through a first transmission path, and the first transmission path includes the first transmission assembly. The vibration of the magnetic circuit assembly is transmitted to the panel through a second transmission path, and the second transmission path includes the second transmission assembly.

7. The bone conduction speaker according to claim 1, characterized in that: The contact surface is a plane or a quasi-plane; Wherein, when the contact surface is a quasi-plane, the normal line of the contact surface is the average normal line of the contact surface; The average normal is: is the mean normal; is the normal of any point on the surface, and ds is the surface element.

8. The bone conduction speaker according to claim 1, characterized in that: The vibration transmission layer is bonded to the panel, and the protrusion of the bonding area of ​​the vibration transmission layer bonded to the panel is higher than that of the non-bonding area on the vibration transmission layer, and a cavity is formed between the non-bonding area and the panel.

9. The bone conduction speaker according to claim 8, characterized in that: The non-adhesive area corresponding to the cavity is provided with a first sound introduction hole.

10. The bone conduction speaker according to claim 9, characterized in that: The portion of the shell corresponding to the cavity is provided with a second sound introduction hole.

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