CN105101020A

CN105101020A - Method for improving tone quality of bone conduction speaker and bone conduction speaker

Info

Publication number: CN105101020A
Application number: CN201510496819.6A
Authority: CN
Inventors: 郑金波; 陈迁; 陈皞; 齐心
Original assignee: Shenzhen Voxtech Co Ltd
Current assignee: Shenzhen Voxtech Co Ltd
Priority date: 2015-08-13
Filing date: 2015-08-13
Publication date: 2015-11-25
Anticipated expiration: 2035-08-13
Also published as: CN105101020B

Abstract

The invention discloses a method for improving the tone quality of a bone conduction speaker and the bone conduction speaker capable of improving the tone quality. The bone conduction speaker comprises a housing, a transducer and a first vibrating sheet; the first vibrating sheet is connected with the transducer physically; the first vibrating sheet is connected with the housing physically; the first vibrating sheet enables the speaker to produce a harmonic peak; and the transducer can produce at least one harmonic peak. The effects of improving the tone quality of the bone conduction speaker, particularly the quality of medium and low tone, and improving the wearing comfort of the bone conduction speaker, are achieved by specific design.

Description

Method for improving tone quality of bone conduction loudspeaker and bone conduction loudspeaker

Technical Field

The invention relates to a high-performance bone conduction speaker and a method for improving the sound quality of the bone conduction speaker, particularly the quality of mid-bass, reducing the sound leakage phenomenon and increasing the wearing comfort level of the bone conduction speaker through specific design.

Background

Generally, a person can hear sound because air transmits vibration to the eardrum through the external auditory canal, and the vibration formed through the eardrum drives the auditory nerve of the person, thereby sensing the vibration of the sound. When the bone conduction speaker works, the bone conduction speaker can be generally transmitted to the auditory nerve of a person through the skin, subcutaneous tissues and bones of the person, so that the person can hear the sound.

Disclosure of Invention

The invention relates to a high-performance bone conduction speaker and a method for improving the sound quality of the bone conduction speaker through specific design. The bone conduction loudspeaker comprises a vibration unit and an earphone frame/earphone hanging belt connected with the vibration unit; the vibration unit at least comprises a contact surface, the contact surface is at least partially in direct or indirect contact with a user,

in another embodiment, the present invention provides a bone conduction speaker for improving sound quality, comprising a housing, a transducer, a first vibrating plate; the first vibration transmission sheet is connected with the energy conversion device in a physical mode; the first vibration transmission piece is connected with the shell in a physical mode; the first vibration conduction sheet can enable the loudspeaker to generate a resonance peak; the transducing means may generate at least one resonant peak;

optionally, the transduction device comprises at least one vibration plate and a second vibration transmission plate, and the transduction device can generate at least two resonance peaks; optionally, the two resonance peaks are both in the audible frequency range audible to the human ear; optionally, the transducing device comprises at least one voice coil and at least one magnetic circuit system; the voice coil is physically connected with the vibrating plate, and the magnetic circuit system is physically connected with the second vibration transmission plate; optionally, the stiffness coefficient of the vibrating plate is greater than that of the second vibration transmission plate; optionally, the first vibration transmission sheet is an elastic sheet; optionally, the second vibration transmission plate is an elastic plate; optionally, the bone conduction speaker comprises at least one contact surface, the contact surface being in contact with a user and transmitting vibrations; optionally, the first vibration transmission plate converges the convergence of the at least two first struts toward the center; preferably, the first vibration-transmitting sheet has a thickness of 0.005mm to 3mm, more preferably, 0.01mm to 2mm, still more preferably, 0.01mm to 1mm, and further preferably, 0.02mm to 0.5 mm.

Drawings

Fig. 1 is a process in which a bone conduction speaker causes hearing to occur in a human ear.

Fig. 2-a is an external view of a vibration generating portion of a bone conduction speaker according to an embodiment of the present invention.

Fig. 2-B is a structural diagram of a vibration generating part of a bone conduction speaker according to an embodiment of the present invention.

Fig. 3 is a structural diagram of a vibration generating part of a bone conduction speaker according to an embodiment of the present invention.

Fig. 4-a and 4-B are top and side views, respectively, of a bone conduction speaker panel bonding in an embodiment of the present invention.

Fig. 5 is a structural diagram of a vibration generating part of a bone conduction speaker according to an embodiment of the present invention.

Fig. 6 is a vibration response curve of a bone conduction speaker according to an embodiment of the present invention.

Fig. 7 is a vibration response curve of a bone conduction speaker according to an embodiment of the present invention.

Fig. 8 is a structural diagram of a vibration generating part of a bone conduction speaker according to an embodiment of the present invention.

Fig. 9-a and 9-B are structural diagrams of a bone conduction speaker and a composite vibration device thereof according to an embodiment of the present invention.

Fig. 10 is a frequency response curve of a bone conduction speaker to which the embodiment of the present invention is applied.

Fig. 11 is a structural diagram of a bone conduction speaker and a composite vibration device thereof according to an embodiment of the present invention.

Fig. 12-a is an equivalent model diagram of a vibration generating part of a bone conduction speaker according to an embodiment of the present invention.

Fig. 12-B is a vibration response curve of a bone conduction speaker suitable for use in one embodiment.

Fig. 12-C is a vibration response curve of a bone conduction speaker suitable for use in one embodiment.

Fig. 13 is a block diagram of a vibration generating portion of a bone conduction speaker in an exemplary embodiment.

Fig. 14 is a block diagram of a vibration generating portion of a bone conduction speaker in an exemplary embodiment.

Fig. 15-a is an application scenario of a bone conduction speaker in an embodiment.

Fig. 15-B is a vibration response curve of a vibration generating portion of a bone conduction speaker in an exemplary embodiment.

Fig. 16 is a block diagram of a vibration generating portion of a bone conduction speaker in an exemplary embodiment.

Fig. 17 is a schematic structural diagram of a bone conduction speaker panel in an embodiment.

Detailed Description

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention and do not limit the application scope of the present invention, and it is obvious for a person skilled in the art to apply the present invention to other similar scenes according to the drawings without creative efforts.

As used in this specification and the appended claims, the terms "a," "an," "the," and/or "the" are not intended to be inclusive in the singular, but rather are intended to be inclusive in the plural, unless the context clearly dictates otherwise. In general, the terms "comprises" and "comprising" merely indicate that steps and elements are included which are explicitly identified, that the steps and elements do not form an exclusive list, and that a method or apparatus may include other steps or elements. The term "based on" is "based, at least in part, on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment". Relevant definitions for other terms will be given in the following description.

Hereinafter, without loss of generality, in describing the bone conduction related art in the present invention, a description of "bone conduction speaker" or "bone conduction headset" will be employed. The description is merely one form of bone conduction application and it will be apparent to one of ordinary skill in the art that the "speaker" or "earpiece" may be replaced by other words of the same kind, such as "player", "hearing aid", etc. Indeed, various implementations of the invention may be readily applied to other non-speaker-type hearing devices. For example, it will be apparent to those skilled in the art that, having the benefit of the basic principles of a bone conduction speaker, various modifications and changes in form and detail may be made to the specific manner and procedure of implementing a bone conduction speaker, and in particular, the incorporation of ambient sound pickup and processing functionality into a bone conduction speaker to enable the speaker to function as a hearing aid, without departing from such principles. For example, a microphone, such as a microphone, may pick up sounds from the user/wearer's surroundings and, under certain algorithms, transmit the sound processed (or resulting electrical signal) to a bone conduction speaker portion. That is, the bone conduction speaker may be modified to incorporate a function of picking up ambient sound, and after a certain signal processing, transmit the sound to the user/wearer through the bone conduction speaker portion, thereby implementing the function of the bone conduction hearing aid. By way of example, the algorithms described herein may include one or more combinations of noise cancellation, automatic gain control, acoustic feedback suppression, wide dynamic range compression, active environment recognition, active anti-noise, directional processing, tinnitus processing, multi-channel wide dynamic range compression, active howling suppression, volume control, and the like.

Bone conduction speakers transmit sound through bones to the hearing system, thereby creating the sense of hearing. Fig. 1 is a process of generating hearing with a bone conduction speaker, which mainly includes the following steps: in step 101, a bone conduction speaker acquires or generates a signal containing sound information; in step 102, the bone conduction speaker generates vibration according to the signal; in step 103, the vibration is transmitted to the sensing terminal 104 through the transmission system. In one working scenario, a bone conduction speaker picks up or generates a signal containing sound information, converts the sound information into sound vibrations through a transducer device, and transmits the sound to a sense organ through a transmission system, ultimately hearing the sound. Without loss of generality, the subject of the hearing systems, sensory organs, etc. described above may be a human or an animal with a hearing system. It should be noted that the following description of the use of the bone conduction speaker by a human does not constitute a limitation on the use scenario of the bone conduction speaker, and similar descriptions may be applied to other animals as well.

The above description of the general flow of bone conduction speakers is merely a specific example and should not be considered the only possible embodiment. It will be obvious to those having skill in the art that, having the benefit of the teachings of the present bone conduction speaker, it is possible to embody the bone conduction speaker in the specific manner and procedure with various modifications and changes in form and detail without departing from such teachings, but such modifications and changes are intended to be within the purview of the foregoing description. For example, between the step 101 of acquiring the signal containing the sound information and the step 102 of generating the vibration, a signal modification or enhancement step may be additionally added, which may enhance or modify the signal acquired in the step 101 according to a specific algorithm or parameter. Further, between the vibration generation step 102 and the vibration transmission step 103, a vibration strengthening or correcting step may be additionally added. This step may be used to intensify or correct the vibrations generated by 102 with the sound signal of 101 or according to environmental parameters. Similarly, the vibration enhancement or modification steps may be performed between steps 103 and 104, such as noise reduction, acoustic feedback suppression, wide dynamic range compression, automatic gain control, active environment recognition, active noise immunity, directional processing, tinnitus processing, multi-channel wide dynamic range compression, active howling suppression, volume control, or the like, or any combination thereof, for the signal, and such modifications and changes are still within the scope of the claims. The methods and steps described herein may be implemented in any suitable order, or simultaneously where appropriate. In addition, individual steps may be deleted from any of the methods without departing from the spirit and scope of the subject matter described herein. Aspects of any of the examples described above may be combined with aspects of any of the other examples described to form further examples without losing the effect sought.

Specifically, in step 101, the bone conduction speaker may acquire or generate a signal containing sound information according to different manners. Sound information may refer to video, audio files having a particular data format, or may refer to data or files in a general sense that can carry data that can ultimately be converted to sound through a particular means. The signal containing the sound information may come from the memory unit of the bone conduction speaker itself, or from an information generation, storage or transmission system other than the bone conduction speaker. The acoustic signals discussed herein are not limited to electrical signals and may include other forms of signals other than electrical signals, such as optical signals, magnetic signals, mechanical signals, and the like. In principle, the signal can be processed as a sound signal, as long as it contains sound information that the loudspeaker can use to generate vibrations. The sound signal is not limited to one signal source, and may be from a plurality of signal sources. These multiple signal sources may or may not be related to each other. The sound signal transmission or generation mode can be wired or wireless, and can be real-time or delayed. For example, the bone conduction speaker may receive an electrical signal containing sound information in a wired or wireless manner, or may directly obtain data from a storage medium to generate a sound signal; the bone conduction hearing aid can be added with a component with a sound collecting function, mechanical vibration of sound is converted into an electric signal by picking up sound in the environment, and the electric signal meeting specific requirements is obtained after the electric signal is processed by an amplifier. Wired connections include, but are not limited to, the use of metal cables, optical cables, or a hybrid of metal and optical cables, such as: coaxial cables, communication cables, flexible cables, spiral cables, non-metallic sheathed cables, multi-core cables, twisted pair cables, ribbon cables, shielded cables, telecommunication cables, twin cables, parallel twin wires, and twisted pairs.

The above-described examples are merely for convenience of illustration, and the medium for wired connection may be other types of transmission medium, such as other transmission medium of electrical or optical signals. Wireless connections include, but are not limited to, radio communications, free-space optical communications, acoustic communications, electromagnetic induction, and the like. Wherein the radio communication includes, but is not limited to, IEEE802.11 series of standards, IEEE802.15 series of standards (e.g., Bluetooth and ZigBee technologies, etc.), first generation mobile communication technologies, second generation mobile communication technologies (e.g., FDMA, TDMA, SDMA, CDMA, and SSMA, etc.), general packet radio service technologies, third generation mobile communication technologies (e.g., CDMA2000, WCDMA, TD-SCDMA, and WiMAX, etc.), fourth generation mobile communication technologies (e.g., TD-LTE and FDD-LTE, etc.), satellite communication (e.g., GPS technologies, etc.), Near Field Communication (NFC), and other technologies operating in ISM band (e.g., 2.4GHz, etc.); free space optical communications include, but are not limited to, visible light, infrared signals, and the like; acoustic communications include, but are not limited to, acoustic waves, ultrasonic signals, and the like; electromagnetic induction includes, but is not limited to, near field communication techniques and the like. The above examples are for convenience of illustration only, and the medium for the wireless connection may be of other types, such as Z-wave technology, other premium civilian radio bands, and military radio bands, among others. For example, as some application scenarios of the present technology, the bone conduction speaker may obtain a signal containing sound information from another device through bluetooth technology, or directly obtain data from a memory unit of the bone conduction speaker, and then generate a sound signal.

The storage device/storage unit includes storage devices on a storage system such as a direct connection storage (directatachediedstorage), a network attached storage (network attached storage), and a storage area network (storage area network). The storage device includes, but is not limited to, various common storage devices such as solid-state storage devices (solid-state disk, solid-state hybrid disk, etc.), mechanical hard disk, USB flash memory, memory stick, memory card (e.g., CF, SD, etc.), other drives (e.g., CD, DVD, HDDVD, Blu-ray, etc.), Random Access Memory (RAM), and Read Only Memory (ROM). The RAM includes but is not limited to: decimal count tubes, delay line memories, Williams tubes, Dynamic Random Access Memories (DRAMs), Static Random Access Memories (SRAMs), thyristor random access memories (T-RAMs), zero-capacitance random access memories (Z-RAMs), and the like; ROM in turn has but is not limited to: bubble memory, magnetic button wire memory, thin film memory, magnetic plated wire memory, magnetic core memory, magnetic drum memory, optical disk drive, hard disk, magnetic tape, early NVRAM (non-volatile memory), phase change memory, magnetoresistive random access memory, ferroelectric random access memory, nonvolatile SRAM, flash memory, EEPROM, erasable programmable read only memory, shielded read-stack memory, floating gate random access memory, nano-RAM, racetrack memory, variable resistive memory, and programmable metallization cells, etc. The above-mentioned storage device/storage unit is just to exemplify some examples, and the storage device that can be used by the storage device/storage unit is not limited thereto.

At 102, the bone conduction speaker may convert the signal containing the sound information into a vibration and generate a sound. The generation of vibration is accompanied by a conversion of energy, and the bone conduction speaker can use a specific transduction device to realize the conversion of a signal into mechanical vibration. The conversion process may involve the coexistence and conversion of multiple different types of energy. For example, the electrical signal may be directly converted to mechanical vibrations by a transducer device, producing sound. As another example, where sound information is contained in the light signal, a particular transducing device may effect the conversion of the light signal into a vibration signal. Other types of energy that may be co-present and converted during operation of the transducer device include thermal energy, magnetic field energy, and the like. The energy conversion method of the energy conversion device includes, but is not limited to, moving coil type, electrostatic type, piezoelectric type, moving iron type, pneumatic type, electromagnetic type, etc. The frequency response range and sound quality of bone conduction speakers can be affected by different transduction methods and the performance of various physical components in the transduction apparatus. For example, in a moving-coil transducer, a wound cylindrical coil is connected to a diaphragm, and the coil driven by a signal current drives the diaphragm to vibrate and generate sound in a magnetic field, and the expansion and contraction of the diaphragm material, the deformation, size, shape, and fixing manner of the folds, the magnetic density of a permanent magnet, and the like all have a great influence on the final sound effect quality of a bone conduction speaker. For another example, the vibrating plate may be a mirror-symmetric structure, a center-symmetric structure, or an asymmetric structure; the vibrating plate can be provided with a discontinuous hole-shaped structure, so that the vibrating plate generates larger displacement, the bone conduction loudspeaker realizes higher sensitivity, and the output power of vibration and sound is improved; for another example, the vibrating plate has a torus structure, and a plurality of struts which converge toward the center are provided in the torus, and the number of the struts may be two or more.

It is obvious to those skilled in the art that, after understanding the basic principle that the transduction mode and the specific device can affect the sound effect quality of the bone conduction speaker, it is possible to appropriately take over, combine, modify or change the above mentioned influencing factors without departing from the principle, so as to obtain the desired sound quality. For example, with a permanent magnet of high magnetic density, a better sound quality can be obtained with a more desirable material and design of the diaphragm.

The term "sound quality" as used herein is understood to reflect the quality of sound and refers to the fidelity of the audio after processing, transmission, etc. The sound quality is mainly described by three elements of loudness, tone and tone. Loudness is the subjective perception of the human ear of the intensity of a sound and is proportional to the logarithmic value of the intensity of the sound, with greater intensity of the sound being perceived as louder. But also the frequency and waveform of the sound. Tone, also known as pitch, refers to the subjective perception of the human ear of the frequency of sound vibration. The pitch depends mainly on the fundamental frequency of the sound, the higher the fundamental frequency the higher the pitch, and it is also related to the intensity of the sound. Timbre refers to the subjective perception of sound characteristics by the human ear. The timbre mainly depends on the spectral structure of the sound and is also related to factors such as the loudness, duration, building and decay processes of the sound. The spectral structure of sound is described by fundamental frequency, number of harmonics, distribution of harmonics, magnitude of amplitude, and phase relationship. Different spectral structures have different timbres. Even if the fundamental frequency and loudness are the same, the timbre is different if the harmonic structure is different.

There are many ways to achieve the vibration of the bone conduction speaker, and fig. 2-a and 2-B are block diagrams of the vibration generating part of the bone conduction speaker in one embodiment, including the housing 210, the panel 220, the transducer device 230, and the connector 240.

The vibration of the panel 220 is transmitted to the auditory nerve through the tissue and bone, thereby making the human hear the sound. The panel 220 may be in direct contact with the skin of a human body, or may be in contact with the skin through a vibration transmission layer (described in detail below) composed of a specific material. The specific material may be selected from low density materials such as plastics (e.g., but not limited to, high molecular weight polyethylene, blow-molded nylon, engineering plastics, etc.), rubbers, and other single or composite materials that achieve the same properties. For the kind of rubber, for example, but not limited to general purpose rubber and special type rubber. General purpose rubbers include, but are not limited to, natural rubber, isoprene rubber, styrene butadiene rubber, neoprene rubber, and the like. Specialty-type rubbers include, but are not limited to, nitrile rubber, silicone rubber, fluororubber, polysulfide rubber, urethane rubber, chlorohydrin rubber, acrylate rubber, propylene oxide rubber, and the like. Among them, the styrene-butadiene rubber includes, but is not limited to, emulsion-polymerized styrene-butadiene rubber and solution-polymerized styrene-butadiene rubber. For composite materials, reinforcing materials such as, but not limited to, glass fibers, carbon fibers, boron fibers, graphite fibers, graphene fibers, silicon carbide fibers, or aramid fibers. And may be a composite of other organic and/or inorganic materials, such as glass fiber reinforced unsaturated polyester, epoxy resin or phenolic resin matrix. Other materials that may be used to form the vibration transmitting layer include combinations of one or more of silicone, PolyUrethane (polyurea), and PolyCarbonate (PolyCarbonate). The transducer device 230 is a component that converts an electrical signal into mechanical vibrations based on some principle. The panel 220 is connected to the transducer 230 and vibrates under the force of the transducer 230. Connector 240 connects faceplate 220 and housing 210 for positioning transducer assembly 230 within the housing. When the transducer 230 transmits the vibration to the panel 220, the vibration is transmitted to the housing through the connecting member 240, causing the housing 210 to vibrate, and changing the vibration mode of the panel 220 accordingly, thereby affecting the vibration transmitted by the panel 220 to the skin of the human body.

It should be noted that the manner of fixing the transducer device and the panel in the housing is not limited to the connection manner described in fig. 2-B, and it is obvious to those skilled in the art that whether the connector 240 is used, or the connector 240 made of different materials, the manner of adjusting the transducer device 230 or the panel 220 to be connected to the housing 210, etc., may exhibit different mechanical impedance characteristics, resulting in different vibration transmission effects, thereby affecting the vibration efficiency of the whole vibration system and producing different sound qualities.

Fig. 2-B shows an example of a connection means, and the connection member 240 may be connected to the top end of the housing 210. Fig. 3 shows another example of the connection, in which the panel 320 extends from the opening of the housing 310, and the panel 320 and the transducer device 330 are connected by a connecting portion 350 and are connected to the housing 310 by a connecting member 340.

In other embodiments, the transducer device may be fixed inside the housing in other connection manners, for example, the transducer device may be fixed on the inner bottom surface of the housing through a connection member, or the bottom of the transducer device (the side of the transducer device connected to the panel is the top, and the opposite side is the bottom) may be fixed inside the housing in a floating manner through a spring, or the top of the transducer device may be connected to the housing, or the transducer device and the housing may be connected through a plurality of connection members located at different positions, or any combination of the above connection manners.

In some specific embodiments, the connecting member has a certain elasticity. The elasticity of the connecting piece is determined by the material, thickness, structure and the like of the connecting piece. The material of the connecting member, such as, but not limited to, steel (e.g., but not limited to, stainless steel, carbon steel, etc.), light alloy (e.g., but not limited to, aluminum alloy, beryllium copper, magnesium alloy, titanium alloy, etc.), plastic (e.g., but not limited to, high molecular weight polyethylene, blow-molded nylon, engineering plastic, etc.), may also be other single or composite materials that can achieve the same performance. For composite materials, reinforcing materials such as, but not limited to, glass fibers, carbon fibers, boron fibers, graphite fibers, graphene fibers, silicon carbide fibers, or aramid fibers. The material constituting the connecting element can also be a composite of other organic and/or inorganic materials, such as glass fibre reinforced unsaturated polyester, epoxy resin or phenolic resin matrices of various types of glass fibre reinforced plastics. The thickness of the connecting piece is not less than 0.005mm, preferably, the thickness is 0.005mm to 3mm, more preferably, the thickness is 0.01mm to 2mm, still more preferably, the thickness is 0.01mm to 1mm, and further preferably, the thickness is 0.02mm to 0.5 mm.

The connecting piece can be configured in a ring shape, preferably comprises at least one circular ring, preferably comprises at least two circular rings, can be concentric circular rings or non-concentric circular rings, the circular rings are connected through at least two supporting rods, the supporting rods radiate from the outer ring to the center of the inner ring, further preferably comprises at least one elliptical circular ring, further preferably comprises at least two elliptical circular rings, different elliptical circular rings have different curvature radiuses, the circular rings are connected through the supporting rods, and further preferably comprises at least one square ring. The connecting piece structure can also be set into a sheet shape, preferably, hollow patterns are arranged on the sheet shape, and more preferably, the area of the hollow patterns is not less than that of the non-hollow parts of the connecting piece. It is noted that the materials, thicknesses, structures of the connectors in the above description may be combined in any way into different connectors. For example, the annular connectors may have a different thickness distribution, preferably the strut thickness is equal to the ring thickness, further preferably the strut thickness is greater than the ring thickness, further preferably the inner ring thickness is greater than the outer ring thickness.

Those skilled in the art can determine the material, position, connection mode, etc. of the connecting element according to different practical applications, or modify, improve or combine the above-mentioned different properties of the connecting element, but these modifications and improvements still fall within the scope of the above description. For example, the connectors described above are not required, and the panel may be directly mounted to the housing or may be bonded to the housing by glue. It should be noted that the shape, size, proportion, etc. of the vibration generating portion of the bone conduction speaker in practical application are not limited to those described in fig. 2-a, fig. 2-B or fig. 3, and those skilled in the art may make certain changes according to the contents described in the figures while considering other factors that may affect the sound quality of the bone conduction speaker, such as the generated double-frequency sound, the wearing manner, etc.

The above description of the structure of the vibration generating part of the bone conduction speaker is merely a specific example and should not be considered as the only possible embodiment. It will be apparent to those skilled in the art that, having the benefit of this general teaching, numerous modifications and variations can be made in the specific constructions and arrangements of parts which will carry out this vibration without departing from the general teaching, but these modifications and variations are within the scope of the invention as defined in the foregoing description. For example, the attachment portion 350 in FIG. 3 may be a portion of the faceplate 320 that is glued to the transducer assembly 330; or may be a portion of the transducer assembly 330 (e.g., a raised portion on the vibrating plate) that is glued to the faceplate 320; or may be a separate component that is glued to both the faceplate 320 and the transducer assembly 330. Of course, the connection between the connection portion 350 and the panel 320 or the transducer 330 is not limited to bonding, and other connections known to those skilled in the art may be suitable for the present invention, such as clamping or welding. Preferably, the panel 320 and the housing 310 may be directly adhered by glue, more preferably, may be connected by a component similar to the elastic member 340, and further preferably, may be connected to the housing 310 by adding a vibration transmission layer (described in detail below) on the outer side of the panel 320. It should be noted that the connecting portion 350 is a schematic diagram illustrating the connection between different components, and those skilled in the art may substitute components having similar functions and different shapes, and these substitutions and changes are still within the scope of the protection described above.

At step 103, sound is delivered to the hearing system via the delivery system. The transmission system can transmit the sound vibration to the hearing system directly through a medium, or can transmit the sound vibration to the hearing system after certain processing in the sound transmission process.

For example, the bone conduction speaker panel transmits vibrations through human tissue to the human hearing system, and changes in the material, contact area, shape and/or size of the panel and the interaction force between the panel and the skin can affect the efficiency of sound transmission through the medium, and thus affect the sound quality. For example, under the same driving, the vibration transmitted by the panels with different sizes has different distribution on the attaching surface of the wearer, and thus, the difference of the sound volume and the sound quality is brought. Preferably, the area of the panel is not less than 0.15cm²More preferably, the area is not less than 0.5cm²Further preferably, the area is not less than 2cm². For another example, the panel is driven by the transducer to vibrate, the bonding point of the panel and the transducer is at the center of the vibration of the panel, and preferably, the panel surrounds the center of the vibrationIs uniform (i.e. the centre of vibration is the physical centre of the panel), more preferably the panel is distributed non-uniformly around the mass in said vibration (i.e. the centre of vibration is offset from the physical centre of the panel). For example, one vibration plate may be connected to a plurality of panels, the plurality of panels may be identical or different in shape and material from each other, or may be connected or disconnected from each other, the plurality of panels transmit sound vibrations through a plurality of paths, the vibration transmission modes between different paths are different from each other, the positions of the vibrations transmitted to the panels are different, and the vibration signals between different panels may be complementary to each other, thereby generating a relatively flat frequency response. For another example, dividing one vibrating plate with a large area into two or more vibrating plates with a small area can effectively improve the uneven vibration caused by the deformation of the panel at high frequency, and make the frequency response more ideal.

It is noted that the physical properties of the panel, such as mass, size, shape, stiffness, vibration damping, etc., all affect the efficiency of the panel vibration. The panel made of a suitable material may be selected by those skilled in the art according to actual needs, or the panel may be injection molded into different shapes by using different molds, preferably, the shape of the panel may be configured as a rectangle, a circle or an ellipse, more preferably, the shape of the panel may be a figure obtained by cutting edges of the rectangle, the circle or the ellipse (for example, but not limited to, a circular symmetry is cut to obtain a shape similar to an ellipse, etc.), and further preferably, the panel may be configured as a hollow. The panel material includes but is not limited to Acrylonitrile Butadiene Styrene (ABS), Polycarbonate (PC), Polyamide (PA) and some metals or alloys (e.g. aluminum alloys), and the related parameters include relative density, tensile strength, elastic modulus, rockwell hardness, etc. of the material. Preferably, the panel material has a relative density of 1.02 to 1.50, more preferably a relative density of 1.14 to 1.45, and even more preferably a relative density of 1.15 to 1.20. The tensile strength of the panel is not less than 30MPa, more preferably, the tensile strength is 33MPa to 52MPa, and further preferably, the tensile strength is not less than 60 MPa. The panel material may have a modulus of elasticity in the range of 1.0GPa to 5.0GPa, more preferably a modulus of elasticity in the range of 1.4GPa to 3.0GPa, and even more preferably a modulus of elasticity in the range of 1.8GPa to 2.5 GPa. Similarly, the hardness (Rockwell hardness) of the panel material may be 60 to 150, more preferably, the hardness may be 80 to 120, and still more preferably, the hardness may be 90 to 100. Particularly, the panel material and the tensile strength are considered together, and may be a relative density of 1.02 to 1.1 and a tensile strength of 33MPa to 52MPa, and more preferably, the panel material has a relative density of 1.20 to 1.45 and a tensile strength of 56 MPa to 66 MPa.

In other embodiments, the bone conduction speaker has a vibration transmission layer wrapped around the outer side of the faceplate, the vibration transmission layer is in contact with the skin, and the vibration system formed by the faceplate and the vibration transmission layer transmits the generated sound vibration to the human tissue. Preferably, the outer side of the panel is wrapped by one vibration transmission layer, and more preferably, the outer side of the panel is wrapped by a plurality of vibration transmission layers; the vibration transmission layer can be made of one or more materials, and the materials of different vibration transmission layers can be the same or different; the plurality of vibration transmission layers may be stacked on each other in a direction perpendicular to the panel, may be arranged in a state of being laid out in a direction horizontal to the panel, or may be a combination of the two arrangements. The area of the vibration transfer layer may be set to various sizes, and preferably, the area of the vibration transfer layer is not less than 1cm²More preferably, the area of the vibration transfer layer is not less than 2cm²Further preferably, the area of the vibration transfer layer is not less than 6cm²。

The vibration transmission layer can be made of a material with certain adsorbability, flexibility and chemical property, such as plastic (for example, but not limited to, high-molecular polyethylene, blow-molded nylon, engineering plastic and the like), rubber, or other single or composite materials capable of achieving the same performance. For the kind of rubber, for example, but not limited to general purpose rubber and special type rubber. General purpose rubbers include, but are not limited to, natural rubber, isoprene rubber, styrene butadiene rubber, neoprene rubber, and the like. Specialty-type rubbers include, but are not limited to, nitrile rubber, silicone rubber, fluororubber, polysulfide rubber, urethane rubber, chlorohydrin rubber, acrylate rubber, propylene oxide rubber, and the like. Among them, the styrene-butadiene rubber includes, but is not limited to, emulsion-polymerized styrene-butadiene rubber and solution-polymerized styrene-butadiene rubber. For composite materials, reinforcing materials such as, but not limited to, glass fibers, carbon fibers, boron fibers, graphite fibers, graphene fibers, silicon carbide fibers, or aramid fibers. And may be a composite of other organic and/or inorganic materials, such as glass fiber reinforced unsaturated polyester, epoxy resin or phenolic resin matrix. Other materials that may be used to form the vibration transmitting layer include combinations of one or more of silicone, PolyUrethane (polyurea), and PolyCarbonate (PolyCarbonate).

The existence of the vibration transmission layer can affect the frequency response of the system, change the tone quality of the bone conduction loudspeaker and simultaneously play a role in protecting elements in the shell. For example, the vibration transmission layer can change the vibration mode of the panel, so that the frequency response of the whole system is smoother. The vibration mode of the panel is affected by factors such as the properties of the panel itself, the connection mode between the panel and the vibration plate, the connection mode between the panel and the vibration transmission layer, the vibration frequency, and the like. The panel's own properties include, but are not limited to, the mass, size, shape, stiffness, vibration damping, etc. of the panel. Preferably, a panel of non-uniform thickness (e.g., without limitation, a panel having a center thickness greater than an edge thickness) may be used. The connection mode of the panel and the vibrating plate includes but is not limited to glue bonding, clamping or welding and the like; the attachment of the panel and the vibration transfer layer includes, but is not limited to, glue attachment; different vibration frequencies can correspond to different vibration modes of the panel, including the integral translation and the torsion translation of different degrees of the panel, and the tone quality of the bone conduction loudspeaker can be changed by selecting the panel with the specific vibration mode in a specific frequency range. Preferably, the specific frequency range referred to herein may be 20Hz-20000Hz, more preferably, the frequency range may be 400Hz-10000Hz, further preferably, the frequency range may be 500Hz-2000Hz, still further preferably, the frequency range may be 800Hz-1500 Hz.

Preferably, the vibration transfer layer described above is wrapped around the outside of the panel, constituting one side of the vibration unit. Different areas on the vibration transmission layer have different vibration transmission effects.

As a specific example, fig. 4-a and 4-B are front and side views, respectively, of the connection of the faceplate to the vibration transfer layer. The panel 401 and the vibration transmission layer 403 are bonded by glue 402, the glue joints are located at two ends of the panel 401, and the panel 401 is located in a shell formed by the vibration transmission layer 403 and the shell 404.

Glue can be adopted for completely sticking the panel and the vibration transmission layer, so that the quality, size, shape, rigidity, vibration damping, vibration mode and other properties of the panel are equivalently changed, and the vibration transmission efficiency is higher; the panel and the transmission layer can be partially bonded by only using glue, so that a non-bonding area between the panel and the transmission layer has gas conduction, the transmission of low-frequency vibration can be enhanced, and the low-frequency effect in sound is improved, preferably, the glue area accounts for 1% -98% of the panel area, more preferably, the glue area accounts for 5% -90% of the panel area, still more preferably, the glue area accounts for 10% -60% of the panel area, and still more preferably, the glue area accounts for 20% -40% of the panel area; the panel and the transmission layer can be bonded without glue, so that the vibration transmission efficiency of the panel and the transmission layer is different from the condition of bonding by using glue, and the tone quality of the bone conduction loudspeaker can be changed. In a specific embodiment, changing the way the glue is applied can change the way the corresponding components in the bone conduction speaker vibrate, thereby changing the sound production and transmission effect. Further, the properties of the glue also affect the sound quality of the bone conduction speaker, such as the hardness, shear strength, tensile strength, and ductility of the glue. For example, preferably, the tensile strength of the glue is not less than 1MPa, more preferably, the tensile strength is not less than 2MPa, and further preferably, the tensile strength is not less than 5 MPa; preferably, the elongation at break of the glue is 100% -500%, more preferably, the elongation at break is 200% -400%; preferably, the shear strength of the glue is not less than 2MPa, more preferably, the shear strength is not less than 3 MPa; preferably, the shore hardness of the glue is 25-30, more preferably 30-50. One glue may be used or a combination of glues of different properties may be used. The bonding strength between the glue and the panel and between the glue and the plastic may also be set within a certain range, such as, but not limited to, 8MPa-14 MPa. It should be noted that the vibration transmission layer material in the embodiment is not limited to silicon gel, but plastic, biological material or other material with certain adsorptivity, flexibility and chemical property can also be used. The person skilled in the art can also decide the type and properties of the glue, the material of the panel bonded with the glue and the material of the vibration transmission layer according to the actual needs, and to a certain extent, the sound quality of the bone conduction speaker.

Fig. 5 is a specific example of the manner in which the components in the vibration generating portion of the bone conduction speaker are connected. The transducer 510 is attached to the housing 520, the faceplate 530 is bonded to the vibration transfer layer 540 by glue 550, and the edges of the vibration transfer layer 540 are attached to the housing 520. In different embodiments, the frequency response of the bone conduction speaker can be changed by changing the distribution, hardness, or amount of glue 550, or changing the hardness of the transmission layer 540, etc., thereby changing the sound quality. Preferably, glue is not coated between the panel and the vibration transmission layer, more preferably, glue is coated between the panel and the vibration transmission layer, further preferably, glue is coated on a partial area between the panel and the vibration transmission layer, and still further preferably, the area of the glue coated area between the panel and the vibration transmission layer is not larger than the area of the panel.

The amount of glue can be decided according to actual need by those skilled in the art, so as to achieve the effect of adjusting the tone quality of the loudspeaker. As shown in fig. 6, in one embodiment, the effect of different glue connections on the frequency response of the bone conduction speaker is reflected. The three curves respectively correspond to the frequency response when no vibration transmission layer and glue are coated, glue is not coated between the vibration transmission layer and the panel, and glue is coated between the vibration transmission layer and the panel. It can be seen that the resonant frequency of the bone conduction speaker shifts to a low frequency when a small amount of glue or no glue is applied between the vibration transmission layer and the panel, relative to the case of full glue. The influence of the vibration transmission layer on the vibration system can be reflected by the bonding condition of glue between the vibration transmission layer and the panel. Therefore, the frequency response curve of the bone conduction loudspeaker can be obviously changed by changing the bonding mode of the glue.

Workers in the field can adjust and improve the bonding mode and the quantity of the glue according to the actual frequency response requirement, so that the sound quality of the system is improved. Similarly, in another embodiment, FIG. 7 reflects the effect of stiffness of different vibration transfer layers on the vibration response curve. The solid line is the vibration response curve for a bone conduction speaker using a harder transmission layer and the dashed line is the vibration response curve for a bone conduction speaker using a softer transmission layer. It can be seen that the use of vibration transmitting layers of different stiffness allows the bone conduction speaker to achieve different frequency responses. The higher the hardness of the vibration transmission layer is, the stronger the capability of transmitting high-frequency vibration is; the smaller the hardness of the vibration transmission layer, the stronger the ability to transmit low-frequency vibrations. Different sound qualities can be obtained by selecting vibration transmission layers of different materials (not limited to silicone, plastic, etc.). For example, a vibration transmission layer made of 45-degree silica gel on the bone conduction speaker can obtain a good bass effect, and a vibration transmission layer made of 75-degree silica gel can obtain a good treble effect. As used herein, low frequency refers to sounds below 500Hz, mid frequency refers to sounds in the range of 500Hz to 4000Hz, and high frequency refers to sounds above 4000 Hz.

Of course, the above description of glue and vibration transfer layer is only one example that may affect the sound quality of a bone conduction speaker and should not be considered the only possible embodiment. It is obvious to those skilled in the art that, after understanding the basic principle affecting the sound quality of the bone conduction speaker, it is possible to make adjustments and changes to the individual components and connections of the vibration generating part of the bone conduction speaker without departing from this principle, but these adjustments and changes are still within the scope of protection described above. For example, the material of the vibration transmission layer may be arbitrary or customized according to the usage habit of the user. The use of glue between the vibration transfer layer and the face plate, which after curing has different hardness, may also have an impact on the sound quality of the bone conduction speaker. In addition, increasing the thickness of the vibration transfer layer may be equivalent to increasing the mass in the constituent vibration system, and may also have the effect of decreasing the resonant frequency of the system. Preferably, the transfer layer has a thickness of 0.1mm to 10mm, more preferably a thickness of 0.3mm to 5mm, still more preferably a thickness of 0.5mm to 3mm, and even more preferably a thickness of 1mm to 2 mm. The tensile strength, viscosity, hardness, tear strength, elongation, etc. of the transfer layer also affect the sound quality of the system. The tensile strength of the material of the transfer layer means a force per unit area required to cause tearing of a sample of the transfer layer, and preferably, the tensile strength is 3.0MPa to 13MPa, more preferably, the tensile strength is 4.0MPa to 12.5MPa, and further preferably, the tensile strength is 8.7MPa to 12 MPa. Preferably, the transfer layer has a shore hardness of 5-90, more preferably 10-80, and even more preferably 20-60. The elongation of the transfer layer refers to the percentage of increase in the relative to the original length at break of the transfer layer, preferably the elongation is between 90% and 1200%, more preferably the elongation is between 160% and 700%, and even more preferably the elongation is between 300% and 900%. The tear strength of the transfer layer refers to the resistance against propagation of the incision or score when a force is exerted on the transfer layer with an incision, preferably the tear strength is between 7kN/m and 70kN/m, more preferably the tear strength is between 11kN/m and 55kN/m, and even more preferably the tear strength is between 17kN/m and 47 kN/m.

In the vibration system composed of the panel and the vibration transmission layer described above, in addition to changing the physical properties of the panel and the transmission layer, and the manner of bonding the panel and the vibration transmission layer, the performance of the bone conduction speaker can be changed from other aspects.

A well-designed vibration generating section including a vibration transmitting layer can further effectively reduce the bone conduction speaker leakage sound. Preferably, the vibration transmission layer is perforated to reduce sound leakage. In one embodiment, as shown in FIG. 8, vibration transfer layer 840 is bonded to panel 830 by glue 850, with the bonded areas of the vibration transfer layer to the panel raised above the unbonded areas of vibration transfer layer 840, and with a cavity below the unbonded areas. The vibration transmission layer 840 is provided with sound-guiding holes 860 in the non-adhesive region and the surface of the housing 820, respectively. Preferably, the non-adhesive area where part of the sound-introducing hole is opened is not in contact with the user. On one hand, the sound-leading holes 860 can effectively reduce the area of the non-bonding area on the vibration transmission layer 840, so that the air inside and outside the vibration transmission layer is permeable, and the difference between the air pressure inside and outside is reduced, thereby reducing the vibration of the non-bonding area; on the other hand, the sound guide holes 860 may guide sound waves formed by the vibration of the air inside the housing 820 to the outside of the housing 820 to cancel sound leakage waves formed by the vibration of the housing 820 pushing the air outside the housing, thereby reducing the amplitude of the sound leakage waves. Specifically, the sound leakage of the bone conduction speaker at any point in space is proportional to the sound pressure P at that point,

wherein,

P＝P₀+P₁+P₂(1)

P₀is the sound pressure, P, generated by the housing (including the portion of the vibration transmission layer not in contact with the skin) at the point mentioned above₁Is the sound pressure, P, of the sound transmitted from the sound-introducing hole in the side of the casing at the point₂Is the sound pressure, P, of the sound transmitted from the sound-introducing hole in the vibration transmission layer at the point₀、P₁、P₂The method comprises the following steps:

where k denotes the wave vector ρ₀Representing the air density, ω representing the angular frequency of vibration, R (x ', y') representing the distance from a point on the sound source to a point in space, S₀Is the surface of the outer shell which is not contacted with the human faceDomain, S₁Is the open pore area of the sound leading hole on the side surface of the shell, S₂Is an open pore area of a sound introducing hole in the vibration transfer layer, W (x, y) represents the intensity of a sound source per unit area,representing the phase difference of sound pressures generated by different sound sources at a point in space. It is noted that there are areas of the vibration transfer layer that are not in contact with the skin (e.g., the edge areas where the sound-introducing holes 860 of the vibration transfer layer 840 are located in fig. 8), which are affected by the vibrations of the panel and the housing to generate vibrations, and thus radiate sound to the outside, and the above-mentioned housing area should include such portions of the vibration transfer layer that are not in contact with the skin. The sound pressure (at an angular frequency of ω) at any point in space can be expressed as:

the aim is to reduce the value of P as much as possible, thereby achieving the effect of reducing the noise leakage. In practical use, the coefficients A1 and A2 can be adjusted by adjusting the size and the number of the sound leading holes, and the phase can be adjusted by adjusting the positions of the sound leading holesThe value of (a). After understanding the principle that the sound quality of the bone conduction speaker is affected by a vibration system consisting of the panel, the transducer, the vibration transmission layer and the shell, a person skilled in the art can adjust the shape, the opening position, the number, the size, the damping on the holes and the like of the sound-leading holes according to actual needs, thereby achieving the purpose of inhibiting sound leakage. For example, the sound-introducing hole may be one or more, preferably a plurality of. For the sound-guiding holes annularly arranged on the side surface of the shell, the number of the sound-guiding holes in each arrangement area can be one or more, for example, 4-8. The shape of the sound leading hole can be round, oval, rectangular or long strip. The sound leading holes on one bone conduction loudspeaker can adopt sound leading holes with the same shape or can adopt sound leading holes with various shapesCombinations of (a) and (b). For example, the vibration transmission layer and the side surface of the shell are respectively provided with sound leading holes with different shapes and numbers, and the number density of the sound leading holes on the vibration transmission layer is greater than that of the sound leading holes on the side surface of the shell. For example, by providing a plurality of small holes in the vibration transmission layer, the area of the portion of the vibration transmission layer not in contact with the skin can be effectively reduced, and the noise leakage generated from this portion can be reduced. For another example, damping material or sound absorbing material is added to the sound-guiding holes on the side of the vibration transmission layer/casing, so that the purpose of suppressing sound leakage can be further enhanced. Further, the sound guide holes may be expanded to other materials or structures that facilitate the transmission of air vibrations within the enclosure out of the enclosure. For example, phase adjusting materials (such as, but not limited to, sound absorbing materials) are used as part of the material of the housing to conduct air vibrations out of a phase range of 90 ° to 270 ° with the other parts of the housing, thereby acting as sound cancellation. Furthermore, the connection mode between the transducer device and the shell can be adjusted to change the phase of the vibration of other parts of the shell, and the phase difference between the vibration and the sound transmitted from the sound guide hole is in the range of 90-270 degrees, so that the sound cancellation effect is achieved. For example, the transducer device and the housing may be made of an elastic connecting member, and the material of the connecting member, such as, but not limited to, steel (e.g., but not limited to, stainless steel, carbon steel, etc.), light alloy (e.g., but not limited to, aluminum alloy, beryllium copper, magnesium alloy, titanium alloy, etc.), plastic (e.g., but not limited to, high molecular weight polyethylene, blow-molded nylon, engineering plastic, etc.), or other single or composite materials capable of achieving the same performance may be used. For composite materials, reinforcing materials such as, but not limited to, glass fibers, carbon fibers, boron fibers, graphite fibers, graphene fibers, silicon carbide fibers, or aramid fibers. The material constituting the connecting element can also be a composite of other organic and/or inorganic materials, such as glass fibre reinforced unsaturated polyester, epoxy resin or phenolic resin matrices of various types of glass fibre reinforced plastics. The thickness of the connecting piece is not less than 0.005mm, preferably, the thickness is 0.005mm to 3mm, more preferably, the thickness is 0.01mm to 2mm, still more preferably, the thickness is 0.01mm to 1mm, and further preferably, the thickness is 0.02mm to 0.5 mm. The connecting element can be configured in a ring-like manner, preferablyPreferably, the ring structure comprises at least one circular ring, preferably at least two circular rings, which can be concentric circular rings or non-concentric circular rings, the circular rings are connected through at least two struts, the struts radiate from an outer ring to the center of an inner ring, further preferably, the ring structure comprises at least one elliptical ring, further preferably, the ring structure comprises at least two elliptical rings, different elliptical rings have different curvature radiuses, the circular rings are connected through the struts, and further preferably, the ring structure comprises at least one square ring. The connecting piece structure can also be set into a sheet shape, preferably, hollow patterns are arranged on the sheet shape, and more preferably, the area of the hollow patterns is not less than that of the non-hollow parts of the connecting piece. It is noted that the materials, thicknesses, structures of the connectors in the above description may be combined in any way into different connectors. For example, the annular connectors may have a different thickness distribution, preferably the strut thickness is equal to the ring thickness, further preferably the strut thickness is greater than the ring thickness, further preferably the inner ring thickness is greater than the outer ring thickness. Description of the sound-introducing holes for housing layout appears in chinese patent application No. 201410005804.0 filed 1/6 2014 entitled "a method for suppressing sound leakage of bone conduction speaker and bone conduction speaker", which is incorporated herein by reference in its entirety.

The above description of the sound-absorbing holes is an example of the present invention and does not constitute a limitation on the bone conduction speaker in terms of improving sound quality, suppressing sound leakage, etc., and the inventors of the present invention may make various modifications and improvements to the above-described embodiment, which modifications and improvements still fall within the above-described protection scope. For example, it is preferable that the sound-introducing hole is opened only in the vibration transmission layer, more preferably, the sound-introducing hole is opened only in a region where the vibration transmission layer does not coincide with the panel, further preferably, the sound-introducing hole is opened in a region where it does not contact with the user, and further preferably, the sound-introducing hole is opened in a cavity inside the vibration unit. For another example, the sound-guiding holes may also be provided in the bottom wall of the housing, and the number of the sound-guiding holes provided in the bottom wall may be one, provided in the center of the bottom wall, or multiple, and arranged to be uniformly distributed circumferentially in an annular shape around the center of the bottom wall. For another example, the sound-guiding holes may be formed in the side wall of the housing, and the number of the sound-guiding holes formed in the side wall of the housing may be one or more, and the sound-guiding holes are circumferentially and uniformly distributed.

The perceived quality of sound is also related to the hearing system of the human body, and different people may have different sensitivity to sounds in different frequency ranges, step 104. In some embodiments, the sensitivity of the human body to sounds of different frequencies may be reflected by an equal loudness curve. Some people, who are not sensitive to sound in a specific frequency range in the sound signal, show a lower response intensity at the equal loudness curve for the corresponding frequency than in other frequencies. For example, some people are insensitive to high frequency sound signals, i.e., appear on the equal loudness curve as intensity responses at corresponding high frequency signals are lower than intensity responses at other frequencies; some people are insensitive to mid-low frequency sound signals and appear on the equal loudness curve as intensity responses at corresponding mid-low frequency signals are lower than those at other frequencies. As used herein, low frequency refers to sounds below 500Hz, mid frequency refers to sounds in the range of 500Hz to 4000Hz, and high frequency refers to sounds above 4000 Hz. It will be apparent to those skilled in the art that the above description of the degree of human hearing sensitivity may be replaced by words of the same kind, such as "equal loudness curve", "hearing response curve", etc. In fact, the sensitivity of the human body to the hearing can also be regarded as a frequency response of sound, and in the description of the various embodiments of the present invention, the sound quality of the bone conduction speaker is finally shown by combining the sensitivity of the human body to the sound and the frequency response of the bone conduction speaker.

As can be seen from fig. 3, the manner in which the transducer 330 of the bone conduction speaker vibration system vibrates, and the manner in which it is coupled to the housing 310, affects the sound effects of the system. Preferably, the transducing device comprises a vibrating plate, a vibration transmitting plate, a set of coils and a magnetic circuit system, and more preferably, the transducing device comprises a composite vibrating device consisting of a plurality of vibrating plates and vibration transmitting plates. The frequency response of the system generated sound is influenced by the physical properties of the vibrating plate and the vibration transmission plate, and the sound effect meeting the actual requirement can be generated by selecting the size, the shape, the material, the thickness, the vibration transmission mode and the like of the specific vibrating plate and the vibration transmission plate.

An embodiment of a compound vibration device is shown in fig. 9-a and 9-B, comprising: the vibration plate 901 is provided as a first circular ring 913, and three first supporting rods 914 having a convergence center are provided in the first circular ring, and the convergence center is fixed to the center of the vibration plate 902. The center of the vibrating plate 902 is a groove 920 matching the convergence center and the first support rod. The vibrating plate 902 is provided with a second circular ring 921 having a radius different from that of the vibrating plate 901, and three second supporting rods 922 having a thickness different from that of the first supporting rods 914, and the first supporting rods 914 and the second supporting rods 922 are arranged in a staggered manner during assembly, but not limited to, at an angle of 60 degrees.

The first supporting rod and the second supporting rod can be straight rods or be arranged into other shapes meeting specific requirements, the number of the supporting rods can be more than two, and the supporting rods are symmetrically or asymmetrically arranged to meet the requirements of economy, practical effect and the like. The vibration transfer plate 901 has a thin thickness and can increase elastic force, and the vibration transfer plate 901 is caught at the center of the recess 920 of the vibration plate 902. A voice coil 908 is bonded to the lower side of the second circular ring 921 of the diaphragm 902. The composite vibration device also comprises a bottom plate 912, wherein an annular magnet 910 is arranged on the bottom plate 912, and an inner magnet 911 is concentrically arranged in the annular magnet 910; an inner magnetic conductive plate 909 is arranged on the top surface of the inner magnet 911, an annular magnetic conductive plate 907 is arranged on the annular magnet 910, a gasket 906 is fixedly arranged above the annular magnetic conductive plate 907, and a first annular body 913 of the vibration transmission piece 901 is fixedly connected with the gasket 906. The whole composite vibration device is connected to the outside through a panel 930, and the panel 930 is fixedly connected to the convergence center position of the vibration transmission plate 901 and is fastened and fixed to the center positions of the vibration transmission plate 901 and the vibration plate 902.

By using the composite vibration device composed of the vibration plate and the vibration transmission plate, the frequency response as shown in fig. 10 is obtained, two resonance peaks are generated by the double composite vibration, the resonance peaks are moved by adjusting the parameters of the size, the material and the like of the two components, the resonance peak of the low frequency is moved to the lower frequency, the resonance peak of the high frequency is moved to the higher frequency, and preferably, the stiffness coefficient of the vibration plate is larger than that of the vibration transmission plate. The frequency response curve shown in fig. 10 can be finally fitted to a dotted line, that is, a flat frequency response in an ideal state, and the range of these resonance peaks may be set within the frequency range of the sound audible to the human ear or not, and preferably, both resonance peaks are not within the frequency range of the sound audible to the human ear; more preferably, one of the formants is within a frequency range of a sound audible to a human ear and the other one of the formants is outside the frequency range of the sound audible to the human ear; more preferably, the resonance peak position is not higher than 30000 Hz; more preferably, both resonance peaks are in the frequency range of the sound audible to the human ear; and still further preferably, both resonance peaks are in the frequency range of sounds audible to the human ear and their peak frequencies are between 80Hz-18000 Hz; still further preferably, both resonance peaks are in the frequency range of sounds audible to the human ear and have a peak value between 200Hz-15000 Hz; even more preferably, both resonance peaks are in the frequency range of sound available to the human ear and have a peak value between 500Hz-12000 Hz; still further preferably, both resonance peaks are in the frequency range of sound available to the human ear and have a peak value between 800Hz-11000 Hz. The peaks of the resonance peaks preferably have a difference in frequency, e.g., the peaks of the two resonance peaks differ by at least 500 Hz; preferably, the peaks of the two resonance peaks differ by at least 1000 Hz; even more preferably, the peaks of the two resonance peaks differ by at least 2000 Hz; still further preferably, the peaks of the two resonance peaks differ by at least 5000 Hz. For better results, both resonance peaks may be within the audible range of the human ear and the peak frequencies of the resonance peaks differ by at least 500 Hz; preferably, both resonance peaks may be within the audible range of the human ear, the peaks of the two resonance peaks differing by at least 1000 Hz; more preferably, both resonance peaks may be within the audible range of human ears, the peaks of the two resonance peaks differing by at least 1000 Hz; still further preferably, both resonance peaks may be within the audible range of human ears, the peaks of the two resonance peaks differing by at least 2000 Hz; and still further preferably, both resonance peaks may be within the audible range of human ears, the peaks of the two resonance peaks differing by at least 3000 Hz; still further preferably, both resonance peaks may be within the audible range of human ears, the peaks of the two resonance peaks differing by at least 4000 Hz. One of the two resonance peaks may be within the human audible range and the other outside the human audible range, and the peak frequencies of the two resonance peaks differ by at least 500 Hz; preferably, one resonance peak is within the human audible range and the other is outside the human audible range, and the peak frequencies of the two resonance peaks differ by at least 1000 Hz; more preferably, one resonance peak is within the human audible range and the other is outside the human audible range, and the peak frequencies of the two resonance peaks differ by at least 2000 Hz; further preferably, one resonance peak is within the human audible range and the other is outside the human audible range, and the peak frequencies of the two resonance peaks differ by at least 3000 Hz; still further preferably, one resonance peak is within the human audible range and the other is outside the human audible range, and the peak frequencies of the two resonance peaks differ by at least 4000 Hz. Both resonance peaks may be between frequencies 5Hz-30000Hz, and the peak frequencies of the two resonance peaks differ by at least 400 Hz; preferably, both resonance peaks may be between frequencies 5Hz-30000Hz, and the peak frequencies of the two resonance peaks differ by at least 1000 Hz; more preferably, both resonance peaks may be between frequencies 5Hz-30000Hz, and the peak frequencies of the two resonance peaks differ by at least 2000 Hz; further preferably, both resonance peaks may be between frequencies 5Hz-30000Hz, and the peak frequencies of the two resonance peaks differ by at least 3000 Hz; still further preferably, both resonance peaks may be at a frequency between 5Hz-30000Hz, and the peak frequencies of the two resonance peaks differ by at least 4000 Hz. Both resonance peaks may be at a frequency between 20Hz and 20000Hz and the peak frequencies of the two resonance peaks differ by at least 400 Hz; preferably, both resonance peaks may be at a frequency between 20Hz and 20000Hz and the peak frequencies of the two resonance peaks differ by at least 1000 Hz; more preferably, both resonance peaks may be between the frequencies 20Hz-20000Hz, and the peak frequencies of the two resonance peaks differ by at least 2000 Hz; further preferably, both resonance peaks may be between the frequencies 20Hz-20000Hz and the peak frequencies of the two resonance peaks differ by at least 3000 Hz; even further preferably, both resonance peaks may be at a frequency between 20Hz-20000Hz and the peak frequencies of the two resonance peaks differ by at least 4000 Hz. Both resonance peaks may be between frequencies 100Hz-18000Hz, and the peak frequencies of the two resonance peaks differ by at least 400 Hz; preferably, both resonance peaks may be between frequencies 100Hz-18000Hz, and the peak frequencies of the two resonance peaks differ by at least 1000 Hz; more preferably, both resonance peaks may be between frequencies 100Hz-18000Hz, and the peak frequencies of the two resonance peaks differ by at least 2000 Hz; further preferably, both resonance peaks may be between frequencies 100Hz-18000Hz, and the peak frequencies of the two resonance peaks differ by at least 3000 Hz; still further preferably, both resonance peaks may be between frequencies 100Hz-18000Hz, and the peak frequencies of the two resonance peaks differ by at least 4000 Hz. Both resonance peaks may be between frequencies 200Hz-12000Hz, and the peak frequencies of the two resonance peaks differ by at least 400 Hz; preferably, both resonance peaks may be between frequencies 200Hz-12000Hz, and the peak frequencies of the two resonance peaks differ by at least 1000 Hz; more preferably, both resonance peaks may be between frequencies 200Hz-12000Hz, and the peak frequencies of the two resonance peaks differ by at least 2000 Hz; further preferably, both resonance peaks may be between frequencies 200Hz-12000Hz, and the peak frequencies of the two resonance peaks differ by at least 3000 Hz; even more preferably, both resonance peaks may be between frequencies 200Hz-12000Hz, and the peak frequencies of the two resonance peaks differ by at least 4000 Hz. Both resonance peaks may be between 500Hz and 10000Hz in frequency and the peak frequencies of the two resonance peaks differ by at least 400 Hz; preferably, both resonance peaks may be between 500Hz-10000Hz in frequency and the peak frequencies of the two resonance peaks differ by at least 1000 Hz; more preferably, both resonance peaks may be between 500Hz and 10000Hz in frequency and the peak frequencies of the two resonance peaks differ by at least 2000 Hz; further preferably, both resonance peaks may be between 500Hz and 10000Hz in frequency and the peak frequencies of the two resonance peaks differ by at least 3000 Hz; even more preferably, both resonance peaks may be at a frequency between 500Hz and 10000Hz, and the peak frequencies of the two resonance peaks differ by at least 4000 Hz. Thus, the resonance response range of the loudspeaker is widened, and the sound quality meeting the conditions is obtained. It should be noted that, in the actual use process, a plurality of vibration transmitting plates and vibration plates may be arranged to form a multi-layer vibration structure, which respectively corresponds to different frequency response ranges, so as to realize full-range full-frequency-response high-quality speaker vibration, or to make the frequency response curve meet the use requirements in some specific frequency ranges. For example, in bone conduction hearing aids, one or more transducers consisting of vibrating and vibrating plates with a resonance frequency in the range of 100Hz to 10000Hz may be selected in order to meet normal hearing requirements. A description of a composite vibration device composed of a vibration plate and a vibration transmission plate is presented in a patent application entitled "a bone conduction speaker and a composite vibration device thereof" disclosed in chinese patent application No. 201110438083.9 filed on 23.12.2011, which is incorporated herein by reference in its entirety.

As shown in fig. 11, in another embodiment, the vibration system includes a vibration plate 1102, a first vibration plate 1103 and a second vibration plate 1101, the first vibration plate 1103 fixes the vibration plate 1102 and the second vibration plate 1101 to a housing 1119, and a composite vibration system composed of the vibration plate 1102, the first vibration plate 1103 and the second vibration plate 1101 can generate not less than two resonance peaks to generate a flatter frequency response curve in the audible range of the hearing system, thereby improving the sound quality of the bone conduction speaker. The vibration system equivalent model is shown in fig. 12-a:

the vibration damper comprises a shell 1201, a panel 1202, a voice coil 1203, a magnetic circuit 1204, a first vibration transmission sheet 1205, a second vibration transmission sheet 1206 and a vibration plate 1207, wherein the first vibration transmission sheet, the second vibration transmission sheet and the vibration plate are abstracted to form elements containing elasticity and damping, and the shell, the panel, the voice coil and the magnetic circuit can be abstracted to form equivalent mass blocks. The vibration equation for the system can be expressed as:

m₆x″₆+R₆(x₆-x₅)′+k₆(x₆-x₅)＝F(6)

m₇x″₇+R₇(x₇-x₅)′+k₇(x₇-x₅)＝-F(7)

m₅x″₅-R₆(x₆-x₅)′-R₇(x₇-x₅)′+R₈x′₅+k₈x₅-k₆(x₆-x₅)-k₇(x₇-x₅)＝0(8)

wherein F is the driving force, k₆Is the equivalent stiffness coefficient, k, of the second vibration-transmitting plate₇Is the equivalent stiffness coefficient, k, of the diaphragm₈Is the equivalent stiffness coefficient, R, of the first vibration-transmitting plate₆Is equivalent damping of the second vibration-transmitting plate, R₇For equivalent damping of the vibrating plate, R₈Is the equivalent damping of the first vibration-transfer plate, m₅Is the mass of the panel, m₆Mass m of the magnetic circuit system₇Is the voice coil mass, x₅Is the panel displacement, x₆For magnetic circuit system displacement, x₇Is the voice coil displacement. The amplitude of the panel 1202 can be found to be:

where ω denotes the angular frequency of the vibration, f₀Indicating a unit driving force.

The vibration system of the bone conduction speaker transmits vibration to a user through a panel, and as can be seen from equation (9), the vibration efficiency of the system is related to the stiffness coefficient and vibration damping of the vibration plate, the first vibration transmission plate and the second vibration transmission plate, and preferably, the stiffness coefficient k of the vibration plate₇Greater than the second vibration coefficient k₆Coefficient of stiffness k of diaphragm₇Greater than the first vibration coefficient k₈. The number of resonance peaks generated by the triple composite vibration system with the first vibration transmission plate is more than that generated by the composite vibration system without the first vibration transmission plate, and preferably, at least three resonance peaks are generated; more preferably, at least one of the resonance peaks is not within the audible range of the human ear; more preferably, the resonance peak position is not higher than 30000 Hz; more preferably, the resonance peaks are all within the audible range of the human ear; still further preferably, the resonance peaks are all within the audible range of the human ear and have peak frequencies no higher than 18000 Hz; still further preferably, the harmonic peaks are all in the frequency range of sounds audible to the human ear and have peak values between 100Hz-15000 Hz; even more preferably, the harmonic peaks are all at the sound of the human earThe frequency range is within the range, and the peak value is between 200Hz and 12000 Hz; still further preferably, the harmonic peaks are all in the frequency range of sound available to the human ear and have peak values between 500Hz-11000 Hz. The peaks of the resonance peaks preferably have a difference in frequency, e.g., there are at least two resonance peaks that differ by at least 200 Hz; preferably, the peaks at which there are at least two resonance peaks differ by at least 500 Hz; more preferably, the peaks where there are at least two resonance peaks differ by at least 1000 Hz; still further preferably, the peaks at which there are at least two resonance peaks differ by at least 2000 Hz; still further preferably, the peaks where there are at least two resonance peaks differ by at least 5000 Hz. For better results, the resonance peaks may all be within the audible range of human ears, and the peak frequencies of at least two resonance peaks differ by at least 500 Hz; preferably, the resonance peaks may all be within the audible range of human ears, with peaks of at least two resonance peaks differing by at least 1000 Hz; more preferably, the harmonic peaks may all be within the audible range of human ears, with at least two harmonic peaks differing by at least 1000 Hz; still further preferably, the resonance peaks may all be within the audible range of human ears, with peaks of at least two resonance peaks differing by at least 2000 Hz; and still further preferably, the harmonic peaks may all be within the audible range of human ears, with at least two harmonic peaks differing by at least 3000 Hz; still further preferably, the resonance peaks may all be within the audible range of human ears, with at least two resonance peaks present with a peak to peak difference of at least 4000 Hz. Two of the resonance peaks may be within the human audible range, the other one is outside the human audible range, and the peak frequencies at which at least two resonance peaks are present differ by at least 500 Hz; preferably, two resonance peaks are within the human audible range, the other resonance peak is outside the human audible range, and the peak frequencies at which at least two resonance peaks are present differ by at least 1000 Hz; more preferably, the two resonance peaks are within the human audible range and the other is outside the human audible range, and the peak frequencies at which at least two resonance peaks are present differ by at least 2000 Hz; it is further preferred that the two resonance peaks are within the human audible range and the other is outside the human audible range, and that the peak frequencies of at least two resonance peaks differ by a differenceAt least 3000 Hz; still further preferably, the two resonance peaks are within the human audible range and the other is outside the human audible range, and the peak frequencies at which at least two resonance peaks are present differ by at least 4000 Hz. One of the resonance peaks may be within the human audible range, the other two may be outside the human audible range, and the peak frequencies at which at least two resonance peaks are present differ by at least 500 Hz; preferably, one resonance peak is within the human audible range, the other two resonance peaks are outside the human audible range, and the peak frequencies of at least two resonance peaks differ by at least 1000 Hz; more preferably, one resonance peak is within the human audible range, the other two are outside the human audible range, and the peak frequencies at which at least two resonance peaks are present differ by at least 2000 Hz; further preferably, one resonance peak is within the human audible range, the other two are outside the human audible range, and the peak frequencies of at least two resonance peaks differ by at least 3000 Hz; still further preferably, one of the resonance peaks is within the human audible range, the other two are outside the human audible range, and the peak frequencies at which at least two of the resonance peaks are present differ by at least 4000 Hz. The resonance peaks may all be between frequencies 5Hz-30000Hz, and the peak frequencies at which there are at least two resonance peaks differ by at least 400 Hz; preferably, the resonance peaks may all be between frequencies 5Hz-30000Hz, and the peak frequencies at which at least two resonance peaks are present differ by at least 1000 Hz; more preferably, the resonance peaks may all be between frequencies 5Hz-30000Hz, and the peak frequencies at which at least two resonance peaks are present differ by at least 2000 Hz; further preferably, the resonance peaks may all be between frequencies 5Hz-30000Hz, and the peak frequencies at which at least two resonance peaks are present differ by at least 3000 Hz; even more preferably, the resonance peaks may all be between frequencies 5Hz-30000Hz, and the peak frequencies at which at least two resonance peaks are present differ by at least 4000 Hz. The resonance peaks may both be at a frequency between 20Hz and 20000Hz and the peak frequencies at which at least two resonance peaks are present differ by at least 400 Hz; preferably, the resonance peaks may both be between the frequencies 20Hz-20000Hz, and the peak frequencies at which at least two resonance peaks are present differ by at least 1000 Hz; more preferably, the resonance peaks may all be between the frequencies 20Hz-20000Hz, and there are at least two harmonicsPeak frequencies of the ringing peaks differ by at least 2000 Hz; further preferably, the resonance peaks may both be between the frequencies 20Hz-20000Hz and the peak frequencies of at least two resonance peaks differ by at least 3000 Hz; even more preferably, the resonance peaks may both be at a frequency between 20Hz and 20000Hz, and the peak frequencies at which at least two resonance peaks are present differ by at least 4000 Hz. The resonance peaks may all be between frequencies 100Hz-18000Hz, and the peak frequencies at which there are at least two resonance peaks differ by at least 400 Hz; preferably, the resonance peaks may all be between frequencies 100Hz-18000Hz, and the peak frequencies at which there are at least two resonance peaks differ by at least 1000 Hz; more preferably, the resonance peaks may all be between frequencies 100Hz-18000Hz, and the peak frequencies at which there are at least two resonance peaks differ by at least 2000 Hz; further preferably, the resonance peaks may all be between frequencies 100Hz-18000Hz, and the peak frequencies at which at least two resonance peaks are present differ by at least 3000 Hz; still further preferably, the resonance peaks may all be between frequencies 100Hz-18000Hz, and the peak frequencies at which at least two resonance peaks are present differ by at least 4000 Hz. The resonance peaks may all be between frequencies 200Hz-12000Hz, and the peak frequencies at which at least two resonance peaks are present differ by at least 400 Hz; preferably, the resonance peaks may all be between frequencies 200Hz-12000Hz, and the peak frequencies at which at least two resonance peaks are present differ by at least 1000 Hz; more preferably, the resonance peaks may all be between frequencies 200Hz-12000Hz, and the peak frequencies at which at least two resonance peaks are present differ by at least 2000 Hz; further preferably, the resonance peaks may all be between frequencies 200Hz-12000Hz, and the peak frequencies at which at least two resonance peaks are present differ by at least 3000 Hz; even more preferably, the resonance peaks may all be between frequencies 200Hz-12000Hz, and the peak frequencies at which at least two resonance peaks are present differ by at least 4000 Hz. The resonance peaks may all be between 500Hz and 10000Hz, and the peak frequencies at which there are at least two resonance peaks differ by at least 400 Hz; preferably, the resonance peaks may all be between 500Hz and 10000Hz, and the peak frequencies at which there are at least two resonance peaks differ by at least 1000 Hz; more preferably, the resonance peaks may all be between 500Hz-10000Hz in frequency, and the peak frequencies of at least two resonance peaks differ by at least 2000 Hz; further preferably, the resonance isThe peaks may all be at a frequency between 500Hz and 10000Hz and the peak frequencies at which there are at least two resonant peaks differ by at least 3000 Hz; even more preferably, the resonance peaks may all be between 500Hz and 10000Hz, and the peak frequencies of at least two resonance peaks differ by at least 4000 Hz. To further achieve a better effect, the at least two resonance peaks may be within the audible range of human ears and the resonance peak produced by the first vibration plate is not higher than 20000Hz, preferably the at least two resonance peaks may be within the audible range of human ears and the resonance peak produced by the first vibration plate is not higher than 10000Hz, preferably the at least two resonance peaks may be within the audible range of human ears and the resonance peak produced by the first vibration plate is not higher than 5000Hz, preferably the at least two resonance peaks may be within the audible range of human ears and the resonance peak produced by the first vibration plate is not higher than 2000Hz, preferably the at least two resonance peaks may be within the audible range of human ears and the resonance peak produced by the first vibration plate is not higher than 1000Hz, preferably the at least two resonance peaks may be within the audible range of human ears and the resonance peak produced by the first vibration plate is not higher than 500Hz, preferably, the at least two resonance peaks may be within the human audible range and the resonance peak produced by the first vibration plate is no higher than 300Hz, preferably, the at least two resonance peaks may be within the human audible range and the resonance peak produced by the first vibration plate is no higher than 200 Hz; preferably, the at least two resonance peaks may be within an audible range of human ears, and the resonance peak produced by the first vibration plate is in a range of 20-20000Hz, preferably, the at least two resonance peaks may be within the audible range of human ears, and the resonance peak produced by the first vibration plate is in a range of 20-10000Hz, preferably, the at least two resonance peaks may be within the audible range of human ears, and the resonance peak produced by the first vibration plate is in a range of 20-5000Hz, preferably, the at least two resonance peaks may be within the audible range of human ears, and the resonance peak produced by the first vibration plate is in a range of 20-2000Hz, preferably, the at least two resonance peaks may be within the audible range of human ears, and the resonance peak produced by the first vibration plate is in a range of 20-1000Hz, preferably, the at least two resonance peaks may be within the audible range of human ears, and areAnd the resonance peak produced by the first vibration plate is in the range of 20-500Hz, preferably, at least two resonance peaks can be in the audible range of human ears, and the resonance peak produced by the first vibration plate is in the range of 20-300Hz, preferably, at least two resonance peaks can be in the audible range of human ears, and the resonance peak produced by the first vibration plate is in the range of 20-200 Hz; more preferably, the transduction apparatus generates at least two resonance peaks in the human audible range and the resonance peak generated by the first vibration plate is not higher than 20000Hz, more preferably, the transduction apparatus generates at least two resonance peaks in the human audible range and the resonance peak generated by the first vibration plate is not higher than 10000Hz, more preferably, the transduction apparatus generates at least two resonance peaks in the human audible range and the resonance peak generated by the first vibration plate is not higher than 5000Hz, more preferably, the transduction apparatus generates at least two resonance peaks in the human audible range and the resonance peak generated by the first vibration plate is not higher than 2000Hz, more preferably, the transduction apparatus generates at least two resonance peaks in the human audible range and the resonance peak generated by the first vibration plate is not higher than 1000Hz, more preferably, the transduction apparatus generates at least two resonance peaks in the human audible range and the resonance peak generated by the first vibration plate is not higher than 500Hz, more preferably, the transduction apparatus generates at least two resonance peaks in the human audible range and the resonance peak generated by the first vibration plate is not higher than 300Hz, and more preferably, the transduction apparatus generates at least two resonance peaks in the human audible range and the resonance peak generated by the first vibration plate is not higher than 200 Hz; more preferably, the transduction means produces at least two resonance peaks in the audible range of human ears and the resonance peak produced by the first vibration plate is in the range of 20-20000Hz, more preferably, the transduction means produces at least two resonance peaks in the audible range of human ears and the resonance peak produced by the first vibration plate is in the range of 20-10000Hz, more preferably, the transduction means produces at least two resonance peaks in the audible range of human ears and the resonance peak produced by the first vibration plate is in the range of 20-5000Hz, more preferably, the transduction means produces at least two resonance peaks in the audible range of human ears and the resonance peak produced by the first vibration plate is in the range of 20-2000Hz, more preferably, the transduction means produces at least two resonance peaks in the audible range of human earsAnd the resonance peak produced by the first vibrating plate is in the range of 20-1000Hz, more preferably, the transducing device produces at least two resonance peaks in the human audible range, and the resonance peak produced by the first vibrating plate is in the range of 20-500Hz, more preferably, the transducing device produces at least two resonance peaks in the human audible range, and the resonance peak produced by the first vibrating plate is in the range of 20-300Hz, more preferably, the transducing device produces at least two resonance peaks in the human audible range, and the resonance peak produced by the first vibrating plate is in the range of 20-200 Hz. In one embodiment, the frequency response shown in fig. 12-B can be obtained by using a triple composite vibration system composed of a vibration plate, a first vibration transmission plate and a second vibration transmission plate, and the triple composite vibration system with the first vibration transmission plate generates three distinct resonance peaks, resulting in a flatter frequency response and improved sound quality.

By changing the parameters such as the size, the material and the like of the first vibration transmission piece, the resonance peak can be moved, and finally, the frequency response under an ideal state is obtained. For example, the stiffness coefficient of the first vibration plate is reduced to a design value, so that the resonance peak can be moved to a design position towards low frequency, the sensitivity of the frequency response of the bone conduction loudspeaker in a low frequency range can be greatly improved, and better sound quality can be easily obtained. As shown in fig. 12-C, when the stiffness coefficient of the first vibration plate gradually decreases (i.e. the first vibration plate changes from hard to soft), the resonance peak moves toward the low frequency direction, and the sensitivity of the frequency response of the bone conduction speaker in the low frequency range is significantly improved. Preferably, the first vibration-transmitting plate is an elastic plate. The elasticity is determined by the material, thickness, structure and the like of the first vibration-transmitting plate. The material of the first vibration-transmitting plate, such as, but not limited to, steel (e.g., but not limited to, stainless steel, carbon steel, etc.), light alloy (e.g., but not limited to, aluminum alloy, beryllium copper, magnesium alloy, titanium alloy, etc.), plastic (e.g., but not limited to, high molecular weight polyethylene, blow-molded nylon, engineering plastic, etc.), or other single or composite materials that can achieve the same performance. For composite materials, such as but not limited to reinforcing materials such as glass fibers, carbon fibers, boron fibers, graphite fibers, graphene fibers, silicon carbide fibers or aramid fibers, composites of other organic and/or inorganic materials can also be used, such as various types of glass fiber reinforced plastics composed of glass fiber reinforced unsaturated polyester, epoxy resin or phenolic resin matrix. The first vibration-transmitting sheet has a thickness of not less than 0.005mm, preferably, a thickness of 0.005mm to 3mm, more preferably, a thickness of 0.01mm to 2mm, still more preferably, a thickness of 0.01mm to 1mm, and further preferably, a thickness of 0.02mm to 0.5 mm. The first vibration-transmitting plate may be configured to be annular, preferably, to include at least one circular ring, preferably, to include at least two circular rings, which may be concentric circular rings or non-concentric circular rings, the circular rings being connected to each other by at least two struts, the struts radiating from the outer ring to the center of the inner ring, further preferably, to include at least one elliptical ring, further preferably, to include at least two elliptical rings, different elliptical rings having different radii of curvature, the circular rings being connected to each other by struts, and further preferably, the first vibration-transmitting plate includes at least one square ring. The first vibration plate structure can also be set to be a plate shape, preferably, a hollow pattern is arranged on the first vibration plate structure, and the area of the hollow pattern is not less than the area without hollowing. The materials, the thicknesses and the structures in the above description can be combined into different vibration transmission sheets. For example, the ring-shaped vibration-transmitting plates have different thickness distributions, preferably the strut thickness is equal to the ring thickness, further preferably the strut thickness is greater than the ring thickness, and further preferably the inner ring thickness is greater than the outer ring thickness.

DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION

Example one

A portable bone conduction hearing aid can choose to adopt various frequency response curves, and a user or a tester can select an appropriate hearing aid response curve to compensate according to the actual response curve of a hearing system. In addition, the vibrating device in the bone conduction hearing aid enables the hearing aid to generate a relatively ideal frequency response in a specific frequency range, for example, the frequency range is 500Hz to 4000Hz according to actual needs.

Example two

A vibration generating portion of a bone conduction speaker is shown in fig. 13. The transducer includes a magnetic circuit system including a magnetic plate 1310, a magnet 1311, and a magnetic conductor 1312, a diaphragm 1314, a coil 1315, a first vibrating plate 1316, and a second vibrating plate 1317. The panel 1313 protrudes out of the housing 1319 and is glued to the membrane 1314 by means of glue, and the first membrane 1316 secures the transducer means connection to the housing 1319, forming a suspension.

The triple vibration system composed of the vibration plate 1314, the first vibration plate 1316 and the second vibration plate 1317 can generate a flatter frequency response curve during the operation of the bone conduction speaker, thereby improving the sound quality of the bone conduction speaker.

The first vibrating plate can be made of materials such as, but not limited to, stainless steel, beryllium copper, plastic, polycarbonate, and the like, and the thickness of the first vibrating plate is in the range of 0.01mm-1 mm.

EXAMPLE III

The embodiment is characterized in that: as shown in fig. 14, with the addition of a vibration transmission layer 1420 (such as but not limited to silicone) on the panel 1413, the vibration transmission layer 1420 can deform to conform to the shape of the skin. The portion of the vibration transfer layer 1420 that is in contact with the panel 1413 is higher than the portion of the vibration transfer layer 1420 that is not in contact with the panel 1413, forming a stepped structure. One or more small holes 1421 are formed at a portion of the vibration transmission layer 1420 not in contact with the panel 1413 (a portion of the vibration transmission layer 1420 not protruding in fig. 14). The small holes are designed in the vibration transmission layer to reduce the sound leakage: the connection of the panel 1413 to the housing 1419 through the vibration transmission layer 1420 becomes weak, and the vibration of the panel 1413 transmitted to the housing 1419 through the vibration transmission layer 1420 is reduced, thereby reducing the leakage sound caused by the vibration of the housing 1419; the small holes 1421 formed in the non-protruding portion of the vibration transmission layer 1420 reduce the area of the back surface, which can reduce the air to be driven, and reduce the sound leakage caused by the air vibration; after the small holes 1421 are formed in the non-protruding portion of the vibration transmission layer 1420, the sound waves in the housing formed by the air vibration in the housing are guided out of the housing, and cancel the sound leakage waves formed by the air vibration induced by the housing 1419, thereby reducing the sound leakage.

Example four

The embodiment is characterized in that: because the panel protrudes out of the loudspeaker shell, and the panel and the loudspeaker shell are connected by the connecting piece, the coupling degree of the panel and the shell is greatly reduced, and the connecting piece can provide certain deformation, so that the panel has higher degree of freedom in fitting with a user, can better adapt to a complex fitting surface (shown in a right drawing in fig. 15-A), and can enable the panel to incline at a certain angle relative to the shell. Preferably, the inclination angle is not more than 5 °.

Further, the vibration efficiency of the speaker varies depending on the attachment state. The good bonding state has higher vibration transmission efficiency. As shown in fig. 15-B, the thick lines indicate the vibration transmission efficiency in the state of good bonding, and the thin lines indicate the vibration transmission efficiency in the state of poor bonding, and it can be seen that the vibration transmission efficiency is higher in the state of good bonding.

EXAMPLE five

The present embodiment is different from the third embodiment in that: the surrounding edge is added to the edge of the shell, and in the process that the shell is in contact with the skin, the surrounding edge enables the acting force to be distributed more uniformly, so that the wearing comfort of the bone conduction speaker is improved. As shown in FIG. 16, there is a height difference d between the perimeter 1610 and the panel 1613₀. The force of the skin on the faceplate 1613 causes the distance d between the faceplate 1613 and the skirt 1610 to decrease, d when the pressure between the bone conduction speaker and the user is greater than the pressure at the connector 1616₀When subjected to forces, the excess clamping force is transmitted to the skin via the skirt 1610 without acting on the vibrating portionThe clamping force produces the influence for the uniformity of clamping force is higher, thereby guarantees tone quality.

EXAMPLE six

The panel shape is shown in fig. 17, and the connection components 1720 of the panel 1710 to the transducer device (not shown in fig. 17) are shown in phantom. The transducer device transmits vibration to the panel 1710 through the connecting member 1720, and the connecting member 1720 is located at the center of vibration of the panel 1710. The center O of the connecting member 1720 is spaced apart from the two sides of the panel 1710 by a distance L₁And L₂. By changing the size of the panel 1710, the position of the connecting member 1720 on the panel 1710 can change the attachment performance of the panel to the skin and the transmission efficiency of vibration. Preferably, L₁And L₂Is set to be greater than 1, more preferably, L₁And L₂Is set to be greater than 1.61, further preferably, L₁And L₂The ratio of (d) is set to be greater than 2. For another example, a large panel, a medium panel, and a small panel may be selected for use in the vibrating device. The large panel referred to here means the panel described in fig. 17, the panel 1710 has an area larger than that of the connecting member 1720, the medium panel means the panel 1710 has the same size as the connecting member 1720, and the small panel means the panel 1710 has an area smaller than that of the connecting member 1720. The different sizes of panels and the positions of the connecting members 1720 may cause different distribution of the transmitted vibration on the attachment surface of the wearer, which may further cause differences in sound volume and sound quality.

The above-mentioned embodiments only express some specific embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, variations and modifications can be made without departing from the spirit of the present invention, such as the several ways of changing the bone conduction sound transmission disclosed in the present specification, and any combination and modification can be made, but these modifications and combinations are still within the scope of the present invention as defined in the appended claims.

Claims

1. A method for improving the sound quality of a bone conduction speaker,

providing a bone conduction speaker, the bone conduction speaker comprising

A shell, an energy conversion device and a first vibration transmission sheet;

the first vibration transmission sheet is connected with the energy conversion device in a physical mode;

the first vibration transmission piece is connected with the shell in a physical mode;

the first vibration conduction sheet can enable the loudspeaker to generate a resonance peak;

the transducing means is capable of generating at least one resonant peak.

2. The method of claim 1, wherein the transducing means comprises at least one vibrating plate and a second vibrating plate, the transducing means capable of generating at least two resonant peaks.

3. The method of claim 2, wherein the two harmonic peaks are both in the frequency range of sound audible to the human ear.

4. The method of claim 2, wherein the transducing means comprises at least one voice coil and at least one magnetic circuit system; the voice coil is physically connected with the vibration plate, and the magnetic circuit system is physically connected with the second vibration transmission plate.

5. The method of claim 1, wherein the first vibration plate is an elastomeric plate.

6. The method of claim 5, wherein the first vibration plates converge toward the center at least two first struts.

7. The method of claim 5, wherein the first vibrating plate has a thickness of 0.005mm to 3 mm.

8. A bone conduction speaker, comprising:

a shell, an energy conversion device and a first vibration transmission sheet;

the first vibration transmission sheet is connected with the energy converter device in a physical mode;

the transducing means is capable of generating at least one resonant peak.

9. The bone conduction speaker as claimed in claim 8, wherein the transducing means includes at least one vibrating plate and a second vibrating plate, the transducing means being capable of generating at least two resonance peaks.

10. The bone conduction speaker of claim 9, wherein both of the resonance peaks are in a frequency range of sound audible to the human ear.

11. The bone conduction speaker as claimed in claim 9, wherein the transducing means comprises at least one voice coil and at least one magnetic circuit system; the voice coil is physically connected with the vibration plate, and the magnetic circuit system is physically connected with the second vibration transmission plate.

12. The bone conduction speaker of claim 8, wherein the first vibration plate is an elastic plate.

13. The bone conduction speaker of claim 12, wherein the first diaphragm converges toward the center at least two first struts.

14. The bone conduction speaker as claimed in claim 12, wherein the first vibrating plate has a thickness of 0.005mm to 3 mm.