JP2018198445A - System for bone conduction speaker - Google Patents

Abstract

To improve the sound quality of a bone conduction speaker to enhance the comfort of the time of mounting.SOLUTION: A vibration transmission layer 503 of a housing 504 is made to have a gradient structure such that pressure is unevenly distributed by providing a region where a panel 501 is projected and an area around it.SELECTED DRAWING: Figure 5-B

Description

  The present disclosure relates generally to bone conduction speakers, and to specific designs of bone conduction speakers to improve sound quality (especially for deep bass), and to reduce sound leakage and user comfort when wearing bone conduction speakers. It is related with the method of raising.

  In general, humans can hear sound because air transmits vibration from the ear canal to the eardrum. Thereafter, the vibration on the eardrum stimulates the auditory nerve, so that a human can feel the vibration of the sound. Bone conduction speakers can transmit vibrations through the human skin, subcutaneous tissue, and bone to the eardrum, which allows the human to hear the sound.

  The present disclosure relates to high performance bone conduction speakers and methods for improving the sound quality of bone conduction speakers through specific designs.

  The bone conduction speaker may include a vibration unit and a headset bracket connected to the vibration unit. The vibration unit may include at least one contact surface. The contact surface may be in contact with the user at least partially, directly or indirectly. The pressure between the user and the contact surface of the vibration unit may be greater than the first threshold and less than the second threshold. The pressure between the user and the contact surface of the vibration unit may be greater than the third threshold and less than the fourth threshold. Preferably, the first threshold value may be larger than the third threshold value, and the transmission efficiency of the high-frequency signal may be improved by the first threshold value, and the sound quality of the high-frequency signal may be improved. Preferably, the third threshold may be the minimum force required to bring the contact surface of the vibration unit into contact with the user. The fourth threshold value may be a minimum force at which the user feels pain due to the contact surface of the vibration unit. Preferably, the second threshold value may be smaller than the fourth threshold value, and the transmission efficiency of the low frequency signal and the sound quality of the low frequency signal may be improved. Preferably, the first threshold may be 0.2N, the second threshold may be 1.5N, the third threshold may be 0.1N, and the fourth threshold is It may be 5N. The sound quality of the bone conduction speaker may be correlated with the pressure distribution on the contact surface of the vibration unit. The frequency response curve of the bone conduction system may be a cumulative value of the frequency response curve at each point on the contact surface. In some embodiments, the pressure between the contact surface and the user may be between 0.1N and 5N. Preferably, the pressure may be 0.2N to 0.4N. Preferably, the pressure may be 0.2N to 3N. More preferably, the pressure may be 0.2N to 1.5N. More preferably, the pressure may be 0.3N to 1.5N.

  In certain embodiments, the present disclosure relates to a bone conduction speaker for reducing sound leakage. The bone conduction speaker may include a vibration unit. The vibration unit may include at least a contact surface. The contact surface may at least partially contact the user directly or indirectly. The contact surface may include at least a first contact area and a second contact area.

  Alternatively, the first contact area may include a sound guide hole. The sound guide hole may guide the sound wave in the housing of the vibration unit to the outside of the housing and superimpose the sound wave of the leaked sound. Alternatively, the side surface of the housing of the vibration unit may include at least one sound guide hole. The sound guide hole may guide sound waves out of the housing of the vibration unit or may superimpose the guided sound waves on the leaked sound waves to suppress sound leakage. A cavity may be disposed below the first contact surface. The panel may be attached below the second contact surface, or the panel may be the second contact surface. If necessary, the second contact surface may protrude from the first contact surface. The first contact region may include at least a portion that does not contact the user, and the sound guide hole may be disposed in a portion that does not contact the user. The second contact surface may be in closer contact with the user, and the contact force between the second contact surface and the user is greater than the contact force between the first contact surface and the user. Also good. If necessary, the shape and area of the panel and the second contact surface may be the same or different. The projected area of the panel on the second contact area may not be larger than the area of the second contact surface.

  In another certain embodiment, the present disclosure is directed to a bone conduction speaker for improving sound quality. The bone conduction speaker may include a housing, a transducer, and a first vibration conduction plate. The first vibration conducting plate may be physically connected to the transducer. The first vibration conducting plate may be physically connected to the housing. The transducer may generate at least one resonance peak.

  If necessary, the transducer may include a vibration board and a second vibration conducting plate. The transducer may comprise at least one voice coil and at least one magnetic circuit. The voice coil may be physically connected to the vibration board, and the magnetic circuit system may be physically connected to the second vibration conducting plate. The stiffness coefficient of the vibration board may be larger than the stiffness coefficient of the second vibration conducting plate. The first vibration conduction plate and the second vibration conduction plate may be elastic plates. If necessary, at least two first rods may converge at the center of the first vibration conducting plate. Preferably, the thickness of the first vibration conductive plate may be 0.005 mm to 3 mm, preferably the thickness may be 0.01 mm to 2 mm, and more preferably the thickness is 0. 0.01 mm to 1 mm may be used, and still more preferably, the thickness may be 0.02 mm to 0.5 mm.

  In another certain embodiment, the present disclosure is directed to a bone conduction speaker for improving sound quality. The bone conduction may include a vibration unit. The vibration unit may include at least one contact surface. The contact surface may be in direct or indirect contact with the user, at least in part. The contact surface may have a gradient structure, whereby pressure may be unevenly distributed on the contact surface.

  Alternatively, the pressure distribution on the contact surface may be non-uniform due to the gradient structure of the contact surface. By making the pressure distribution non-uniform, the contact points of the contact surface may have different frequency response curves. The frequency response curves of the contact surfaces may be generated by superimposing the frequency response curves at each point. One side of the contact surface facing the user may have a gradient structure. The gradient structure may include at least one protrusion. Alternatively, the gradient structure may include at least one concave structure. The gradient structure may be located at the center or end of the side of the contact surface facing the user. Alternatively, the gradient structure may be arranged on the side of the contact surface opposite to the side facing the user. The gradient structure may include at least one convex portion or at least one concave portion.

  The disclosure will be further described based on exemplary embodiments. These exemplary embodiments will be described in detail with reference to the drawings. The scale of the drawings is not constant. These embodiments are exemplary embodiments and do not limit the present disclosure. In these embodiments, like reference numerals indicate similar structures throughout the several figures included in the drawings.

FIG. 5 illustrates a process for a bone conduction speaker that creates a sense of sound being heard in a user's ear. It is a figure which shows an example of a structure of the vibration generation part of the bone conduction speaker which concerns on some embodiments of this indication. It is a figure which shows an example of the structure of the vibration production | generation part of the bone conduction speaker which concerns on a part of embodiment of this indication. It is a figure which shows an example of the structure of the vibration production | generation part of the bone conduction speaker which concerns on a part of embodiment of this indication. It is a figure which shows the equivalent vibration model of the vibration production | generation part of the bone conduction speaker which concerns on a part of embodiment of this indication. It is a figure which shows the vibration response curve of the bone conduction speaker which concerns on a part of embodiment of this indication. It is an exemplary figure showing the sound vibration transmission system of the bone conduction speaker concerning a part of an embodiment of this indication. It is an exemplary view showing a plan view of a connected body of bone conduction speaker panels according to a part of an embodiment of the present disclosure. It is an exemplary figure showing a side view of a connection body of a bone conduction speaker panel concerning a part of an embodiment of this indication. It is a figure which shows the structure of the vibration production | generation part of the bone conduction speaker which concerns on a part of embodiment of this indication. It is a figure showing a vibration response curve of a bone conduction speaker when a bone conduction speaker operates according to a part of an embodiment of the present disclosure. It is a figure showing a vibration response curve of a bone conduction speaker when a bone conduction speaker operates according to a part of an embodiment of the present disclosure. It is a figure which shows the structure of the vibration production | generation part of the bone conduction speaker which concerns on a part of embodiment of this indication. It is a figure which shows the frequency response curve of the bone conduction speaker which concerns on a part of embodiment of this indication. It is a figure which shows the equivalent model of the vibration production | generation system of a bone conduction speaker which concerns on a part of embodiment of this indication. It is a figure which shows the structure of the bone conduction speaker which concerns on a part of embodiment of this indication. It is a figure which shows the vibration response curve of the bone conduction speaker which concerns on a part of embodiment of this indication. It is a figure which shows the vibration response curve of the bone conduction speaker which concerns on a part of embodiment of this indication. It is a figure which shows the method of measuring the clamping force of the bone conduction speaker which concerns on a part of embodiment of this indication. It is a figure which shows the method of measuring the clamping force of the bone conduction speaker which concerns on a part of embodiment of this indication. It is a figure which shows the vibration response curve of the bone conduction speaker which concerns on a part of embodiment of this indication. It is a figure which shows how to adjust the fastening force of the bone conduction speaker which concerns on a part of embodiment of this indication. It is a figure which shows the structure of the contact surface of the vibration unit of the bone conduction speaker which concerns on a part of embodiment of this indication. It is a figure which shows the vibration response curve of the bone conduction speaker which concerns on a part of embodiment of this indication. It is a figure which shows the structure of the contact surface of the vibration unit of the bone conduction speaker which concerns on a part of embodiment of this indication. It is a figure which shows the structure of the bone conduction speaker which concerns on a part of embodiment of this indication, and the combined vibration unit. It is a figure which shows the structure of the bone conduction speaker which concerns on a part of embodiment of this indication, and the combined vibration unit. It is a figure which shows the frequency response curve of the bone conduction speaker which concerns on a part of embodiment of this indication. It is a figure which shows the structure of the bone conduction speaker which concerns on a part of embodiment of this indication, and the combined vibration unit. It is a figure which shows the equivalent vibration model of the vibration part of the bone conduction speaker which concerns on a part of embodiment of this indication. It is a figure which shows the vibration response curve of the bone conduction speaker which concerns on a specific embodiment of this indication. It is a figure which shows the vibration response curve of the bone conduction speaker which concerns on a specific embodiment of this indication. It is a figure which shows the structure of the vibration generation part of the bone-conduction speaker which concerns on a specific embodiment of this indication. It is a figure which shows the vibration response curve of the bone conduction speaker which concerns on a specific embodiment of this indication. It is a figure which shows the sound leak curve of the bone conduction speaker which concerns on a specific embodiment of this indication. It is a figure which shows the structure of the vibration generation part of the bone-conduction speaker which concerns on a specific embodiment of this indication. It is a figure which shows the application scenario of the bone conduction speaker which concerns on a specific embodiment of this indication. It is a figure which shows the vibration response curve of the bone conduction speaker which concerns on a specific embodiment of this indication. It is a figure which shows the structure of the vibration generation part of the bone-conduction speaker which concerns on a specific embodiment of this indication. It is a figure which shows the structure of the panel of the bone conduction speaker which concerns on a specific embodiment with this indication. FIG. 5 is a diagram illustrating a gradient structure on the outer surface of the contact surface of a bone conduction speaker according to certain embodiments of the present disclosure. It is a figure which shows the vibration response curve of the bone conduction speaker which concerns on a specific embodiment of this indication. It is a figure which shows the vibration response curve of the bone conduction speaker which concerns on a specific embodiment of this indication. It is a figure which shows the gradient structure on the inner surface of the contact surface of the bone conduction speaker which concerns on a specific embodiment of this indication. It is a figure which shows the structure of the vibration generation part of the bone conduction speaker which concerns on an Example.

  To illustrate the technical solutions of some embodiments according to the present disclosure more clearly, the drawings described in the embodiments will be briefly described. It should be noted that the following description of the drawings merely shows some of the embodiments of the present disclosure and does not limit the scope of the present disclosure. Those skilled in the art can apply these drawings in other similar applications based on this disclosure without going through creative activities.

  In the present application and claims, the singular forms include plural forms unless specifically stated otherwise. In general, the terms “comprising” and “including” include only clearly specified steps or elements, but these steps and elements are not exclusive, and a method or apparatus may include other steps or elements. Can be included. The expression “based on” means “based at least in part”. The term “implementation” means “at least one embodiment” and the term “another embodiment” means “at least one further embodiment”. Means. Definitions of other terms are set forth in the detailed description of the invention below.

  In describing related techniques for bone conduction, the terms “bone conduction speaker” or “bone conduction headset” may be used. For those skilled in the art, the description of the specification is merely illustrative of one form of bone conduction application, and “speaker” and “headset” may refer to other similar language (eg, “player”, “hearing aid”). Etc.). Indeed, the various embodiments of the present disclosure can be readily applied to other hearing devices other than speakers. For example, after understanding the basic principles of a bone conduction speaker, those skilled in the art may change and modify various forms and details. Specifically, if the bone conduction speaker has the ability to receive and process sound from the surrounding environment, the speaker may be used as a hearing aid. For example, a microphone can pick up sounds emitted by a user or wearer of the microphone. The sound may be processed according to an algorithm (or generated electrical signal) and transmitted to a bone conduction speaker. In other words, the bone conduction speaker may have a function of picking up sound, processing the sound, and then transmitting it to the user or wearer. As a result, the bone conduction speaker may function as a bone conduction hearing aid. Good. For illustrative purposes only, the algorithm includes noise cancellation, automatic gain control, acoustic feedback suppression, wide dynamic range compression, active environment recognition, active anti-noise, Directional processing, tinnitus prevention processing, multi-channel wide dynamic range compression, active whistle suppression, volume control, etc., or combinations thereof may be included.

  A bone conduction speaker may transmit sound through a human bone to the human auditory system, thereby creating a sense that the sound is being heard. FIG. 1 shows a process for a bone conduction speaker to create a sense of hearing. The above process may include the following steps. In step 101, the bone conduction speaker may obtain or generate a signal including audio information. In step 102, the bone conduction speaker may generate vibration according to the signal. In step 103, the vibration is transmitted to the sensor terminal 104 by the transmission system. In some embodiments, the bone conduction speaker may pick up or generate a signal that includes audio information. Further, the bone conduction speaker may convert the sound information into sound wave vibration by a transducer. Then, the sound may be transmitted to a human sensory organ so that the sound can be heard. In general, the auditory system, sensory organs, etc. described above may be part of a human or animal. It should be noted that the description of the bone conduction speaker described below is not limited to humans but can be applied to other animals.

  The above description of the process of operation of the bone conduction speaker is merely a specific embodiment and should not be construed as the only possible embodiment. It is clear that various modifications and changes can be made to the implementation and steps of the bone conduction speaker embodiment after the person skilled in the art understands the basic principles of a bone conduction speaker. However, these changes and modifications also belong to the scope of the present disclosure as described above. For example, an additional step of modifying the signal or enhancing the signal may be added between step 101 and step 102. Additional steps may enhance or modify the signal obtained in step 101 according to a particular algorithm or parameter. Further, the additional step may be added between step 102 and step 103. An additional step may modify or augment the vibration generated in step 102 according to the audio signal or environmental parameters of step 101. Similarly, for example, noise cancellation, automatic gain control, acoustic feedback suppression, wide dynamic range compression, active environment recognition, active noise prevention, directivity processing, tinnitus prevention processing, multi-channel wide dynamic range compression, active whistling Additional steps of the above vibration enhancement or vibration modification, such as sound suppression, volume adjustment, or combinations thereof, may be performed between step 103 and step 104. Such modifications and changes are also within the scope of the present disclosure. In the present application, the methods and steps described may be performed in any suitable order and may be performed simultaneously. Further, individual steps may be omitted from any method without departing from the spirit and scope of the inventive subject matter. All the aspects of any of the above embodiments may be combined with each other to constitute another embodiment as long as the intended effect is not lost.

  Specifically, in step 101, the bone conduction speaker may obtain or generate a signal that includes audio information in various ways. The audio information may refer to a video file or an audio file having a specific data format, and may refer to general data or a file that can be finally converted into audio through a specific approach. The signal containing audio information may be captured from a storage device of the bone conduction speaker itself or from an information generation system, storage system, or delivery system external to the bone conduction speaker. Although not particularly limited, the audio signals discussed in this application may include electrical signals, optical signals, magnetic signals, mechanical signals, etc., or combinations thereof. In principle, as long as the signal contains audio information that can be used to generate vibrations, the signal may be processed as an audio signal. The signal is not limited to one derived from one signal source, but may be derived from a plurality of signal sources. The plurality of signal sources may be independent from each other or may be dependent on each other. An approach for generating or transmitting an audio signal may be wired, wireless, real-time, or delayed. For example, a bone conduction speaker may receive a signal containing audio information through wiring or without wiring, or may obtain data directly from a storage medium and generate an audio signal. Bone conduction hearing aids may include components for picking up sound from the surrounding environment, and bone conduction hearing aids may convert mechanical vibrations of sound into electrical signals. At this time, the electric signal may be processed by an amplifier so as to reach a special requirement. Although not particularly limited, the wired connection may include a metal cable, an optical cable, or a combination thereof. Examples of these include, for example, coaxial cables, communication cables, flexible cables, spiral cables, non-metal sheath cables, metal sheath cables, multi-core cables, twisted pair cables, ribbon cables, shielded cables, telecommunication cables, cable pairs, Examples include core parallel wiring and twisted pairs.

  The above examples may be used for illustrative purposes. Wired connections may include other types of carriers, such as other types of carriers for electrical or optical signal transmission. Although not particularly limited, the wireless connection includes wireless communication, free space optical communication, voice communication, electromagnetic induction, and the like. Wireless communication includes IEEE 802.11, IEEE 802.15 (for example, Bluetooth (registered trademark) and ZigBee technology), first generation mobile communication technology, second generation mobile communication technology (for example, FDMA, TDMA, SDMA, CDMA). , And SSMA), general packet radio service technology, third generation mobile communication technology (eg CDMA2000, WCDMA®, TD-SCDMA and WiMAX), fourth generation mobile communication technology (eg TD-LTE and FDD-LTE) ), Satellite communications (eg, GPS technology), near field communication (NFC) technology, and other operating in the ISM band (eg, 2.4 GHz). Free space optical communication may include visible light signals, infrared signals, and the like. The voice communication may include a sound wave signal and an ultrasonic signal. Although not particularly limited, electromagnetic induction may include near field communication technology. The above examples are used for illustrative purposes, and other types of wireless media may be used, such as Z-Wave technology, other paid radio bands for civilian or military use, or other radio frequency bands, Or a combination thereof may be included. For example, in some application scenarios, the bone conduction speaker may obtain audio signals from other devices via Bluetooth technology, may obtain data from the storage unit of the bone conduction speaker itself, and generate audio signals May be.

  Storage devices / storage units may include Direct Attached Storage, Network Attached Storage, Storage Area Network, and other storage systems. Although not particularly limited, the storage device may be a general-purpose storage device such as a solid state storage device (SSD solid state hybrid drive, etc.), a mechanical hard disk, a USB flash memory, a memory stick, a memory card (eg, CF, SD, etc.). , Other drivers (eg, CD, DVD, HD DVD, Blu-ray, etc.), random access memory (RAM), read only memory (ROM), etc., or combinations thereof. Although not particularly limited, the RAM includes a decimal counter, selectron, delay line storage device, Williams tube, dynamic random access memory (DRAM), static random access memory (SRAM), thyristor random access memory (T-RAM), And zero capacitor random access memory (Z-RAM), etc., or a combination thereof. Although not particularly limited, the ROM includes a magnetic bubble memory, a magnetic button line memory, a film memory, a magnetic plate line memory, a core memory, a magnetic drum memory, a CD-ROM, and a hard disk. , Magnetic tape, initial NVRAM (nonvolatile memory), phase change memory, magnetoresistive random memory, ferroelectric random memory, nonvolatile SRAM, flash memory, electronic erasable rewritable read only memory, erasable programmable read only memory ( EPROM), programmable read only memory, random access memory floating shield connected to the floating gate Pumemori (read shielded heap memory), nano random memory, racetrack memory, resistance variable memory, and the like programmable metallization cell. The above-described storage device / storage unit is merely a few examples, and there is no particular limitation on the storage medium used in the storage device / storage unit.

  In step 102, the bone conduction speaker may convert a signal containing audio information into vibration or generate sound. A bone conduction speaker may convert a signal into mechanical vibration with energy conversion by using a specific transducer. The conversion process may include multiple types of energy coexistence and energy conversion. For example, a transducer may generate sound by directly converting an electrical signal into mechanical vibration. As another example, audio information may be included in an optical signal, and the audio information may be converted to mechanical vibration by a specific transducer. Other types of energy that can be converted and coexist when the transducer is activated include magnetic energy, thermal energy, and the like. Although not particularly limited, the energy conversion mode of the transducer includes a movable coil mode, an electrostatic mode, a piezoelectric mode, a movable iron piece mode, a pneumatic mode, an electromagnetic mode, and the like. The frequency response range and sound quality of a bone conduction speaker may be affected by the energy conversion mode and physical properties of the transducer's physical components. For example, in a movable coil transducer, when a columnar coil is connected to a vibration board, the vibration board may vibrate to generate sound when the vibration board is driven by the coil. Factors such as the material expansion and contraction, bending deformation, size, shape, and fixing method of the vibration board, and the magnetic density of the permanent magnet can have a great influence on the sound quality of the bone conduction speaker. As another example, the vibration board may have a left-right reversal structure, a centrally symmetric structure, or an asymmetric structure. The vibration board may have a discontinuous porous structure, which may increase the displacement of the vibration board to increase the sensitivity of the bone conduction speaker and improve the vibration and sound output. . As yet another example, the vibration board may have a ring structure that may have two or more rods that converge at the center of the ring.

  After a person skilled in the art understands the basic principles of improving the sound quality of a bone conduction speaker, the person skilled in the art may select, combine, modify, or change the above factors to obtain the ideal sound quality. Obviously it may be. For example, better sound quality may be obtained using a high-density permanent magnet and a more ideal plate-like material or structural design.

  The term “sound quality” indicates sound quality and refers to the fidelity of the sound after post-processing, transmission, and the like. In the audio device, the sound quality may include sound intensity and magnitude, audible frequency, sound overtone or harmonic component, and the like. When sound quality is evaluated, measurement methods and evaluation criteria for objectively evaluating sound quality may be used, and various factors relating to sound and subjective feelings for evaluating various properties of sound quality Other methods combining the above may be used. Thus, sound quality can be affected during the process of sound generation, sound transmission and sound reception.

  There are various ways to perform vibration of bone conduction speakers. FIG. 2-A and FIG. 2-B show examples of the structure of the vibration generator of a bone conduction speaker according to a specific embodiment of the present disclosure. The vibration generating unit of the bone conduction speaker may include a housing 210, a panel 220, a transducer 230, and a connector 240.

  Panel 220 can transmit vibrations to the auditory nerve through tissue and bone, which allows humans to work with sound. The panel 220 may be in direct contact with the human skin or may be in contact with the human skin through a vibration transmission layer made of a specific material (described in detail below). The specific material may be a low specific gravity material, such as, but not limited to, low specific gravity such as plastic (polyethylene, blow molded nylon, engineering plastic, etc.), rubber, or a single material or composite material capable of achieving similar performance. You may choose from materials. Although not particularly limited, the rubber includes general-purpose rubber and special rubber. Although not particularly limited, examples of the general-purpose rubber include natural rubber, isoprene rubber, styrene-butadiene rubber, butadiene rubber, and chloroprene rubber. Although not particularly limited, the special rubber includes nitrile rubber, silicone rubber, fluorine rubber, polysulfide rubber, urethane rubber, chlorohydrin rubber, acrylic rubber, propylene oxide rubber, and the like. Although not particularly limited, the styrene-butadiene rubber includes styrene-butadiene rubber obtained by emulsion polymerization and solution polymerization. Although not particularly limited, the composite material includes a reinforcing material such as glass fiber, carbon fiber, boron fiber, graphite fiber, fiber, graphene fiber, silicon carbide fiber, or aramid fiber. The composite material may be a composite of other organic and / or inorganic materials such as various types of glass fibers reinforced with unsaturated polyester and epoxy, glass fibers having a phenolic resin matrix. Other materials used as the vibration transmitting layer may include silicone, polyurethane, polycarbonate, or combinations thereof. The transducer 230 may convert the electrical signal into mechanical vibration based on certain principles. Panel 220 may be connected to transducer 230 or driven by transducer 230 to vibrate. The connector 240 may connect the panel 220 and the housing 210, and may fix the transducer 230 in the housing. When the transducer 230 transmits vibration to the panel 220, the vibration may be transmitted to the housing 210 via the connector 240. Accordingly, the housing 210 may be vibrated, and the vibration mode of the panel 220 can be changed to affect the vibration transmitted to the skin via the panel 220.

  Note that the method of securing the transducer and panel to the housing is not limited to the method shown in FIG. For those skilled in the art, depending on whether the connector 240 is used, whether the material used to manufacture the connector 240 is different, and which method is used as a method of securing the transducer 230 or panel 220 to the housing 210 The impedance characteristics may be different, and as a result, another vibration transmission effect may occur. In this way, the vibration effect of the entire vibration system is affected, and different sound quality may be born.

  For example, instead of using a connector, the panel may be attached directly to the housing using an adhesive, or the panel may be secured directly to the housing by pressing or welding. When using a connector having an appropriate elastic force, the connector may absorb shocks and reduce vibration energy transmitted to the housing, thereby effectively suppressing sound leakage caused by vibration of the housing, Sound quality may be improved by making it easier to avoid the occurrence of abnormal noise caused by abnormal resonance that may occur. If the position of the connector inside or on the housing is different, the effect on the vibration transmission efficiency may be different accordingly. Preferably, the state of the transducer may be different depending on the connector, such as a suspended state (suspend), a supported state (support), and the like.

  FIG. 2-B is an embodiment of the connection. Connector 240 may connect the top of housing 210. FIG. 2-C is another embodiment of the connection. The panel 220 may protrude outward from the opening of the housing 210. Panel 220 may be connected to transducer 230 via connection 250 and may be coupled to housing 210 via connector 240.

  In certain other embodiments, the transducer may be secured within a housing having other connection means. For example, the transducer may be fixed to the inner bottom of the housing via a connector. Or the bottom of the transducer (the side connected to the transducer panel is defined as the top and the opposite side is defined as the bottom) may be attached to the housing by a suspended spring, The top of the reducer may be fixed on the housing, or may be connected to the housing by a plurality of connectors at different locations, or a combination thereof.

  In some embodiments, the connector may be elastic. Connector elasticity may be affected by the material, thickness, structure, and other conditions of the connector. Although not particularly limited, the connector material may be steel (not particularly limited, for example, stainless steel or carbon steel), light alloy (although not particularly limited, for example, aluminum, beryllium copper, magnesium alloy, titanium alloy), plastic (particularly Non-limiting examples include polyethylene, blow molded nylon, plastic, and the like. The connector material may be a single material or a composite material that achieves similar performance. Although not particularly limited, such composite materials include reinforcing materials such as glass fibers, carbon fibers, boron fibers, graphite fibers, graphene fibers, silicon carbide fibers, aramid fibers, and the like. The composite material may be other organic and / or inorganic composite materials such as various types of glass fibers reinforced with unsaturated polyesters and epoxies, glass fibers containing a phenolic resin matrix. The thickness of the connector may be 0.005 mm or more, preferably the thickness may be 0.005 mm to 3 mm, more preferably the thickness may be 0.01 mm to 2 mm, and still more preferably. The thickness may be from 0.01 mm to 1 mm, and even more preferably, the thickness may be from 0.02 mm to 0.5 mm.

  The connector may have an annular structure, preferably an annular structure including at least one, more preferably at least two annular rings. The annular ring may be a concentric ring or a non-concentric ring, and they may be connected to each other via at least two rods that converge from the outer ring toward the center of the inner ring. More preferably there may be at least one elliptical ring, and even more preferably there may be at least two elliptical rings. The elliptical rings may have different radii of curvature for each ring, and the elliptical rings may be connected to each other via a rod. More preferably, there may be at least one angular ring. The structure of the connector may be configured as a plate. Preferably, a hollow pattern may be formed on the plate. More preferably, the area of the hollow pattern may be equal to or greater than the area of the non-hollow portion of the connector. It should be noted that the above-described connector materials, structures, and thicknesses can be combined in any manner, whereby another new connector can be obtained. For example, the annular connectors may have different film thickness distributions, preferably the ring thickness may be equal to the rod thickness, more preferably the rod thickness may be greater than the ring thickness. More preferably, the thickness of the inner ring may be greater than the thickness of the outer ring.

  A person skilled in the art can choose for each scenario to apply the connector material, position and connection means, and various characteristics of the connector may be modified, improved or combined. These also belong to the scope of the above description. In some embodiments, the connector described above is not necessary, and the panel may be connected directly to the housing or may be glued to the housing using an adhesive. It should be noted that the shape, size, ratio, etc. of the vibration generator in the actual application state of the bone conduction speaker are not limited to the contents described in FIG. 2-A, 2-B or FIG. 2-C. I want. A person skilled in the art may change the content according to the content described in the figure in consideration of other possible sound quality influencing factors such as the degree of sound leakage, the generation of frequency sound, and the mounting method.

  Well-designed, well-tested transducers and panels can solve many of the challenges often faced by bone conduction speakers. For example, bone conduction speakers may have sound leakage problems. In the present application, a leaked sound is a sound that can be generated by vibration of a speaker, and is conducted to the surrounding environment when the bone conduction speaker is operated, and others in the environment hear the sound from the speaker. A sound that can be heard. Reasons for sound leakage include housing vibration caused by vibration conducted from the transducer and panel through the connector, or housing vibration caused by air vibration in the housing. In addition, the vibration of air is caused by the vibration of the transducer. FIG. 3A shows an equivalent vibration model of the vibration generation unit of the bone conduction speaker. The vibration generator may include a fixed end 301, a housing 311, and a panel 321. The connection between the fixed end 301 and the housing 311 may be equivalent to the connection formed by the elastomer 331 and the damping element 332. The connection between the housing 311 and the panel 321 may be equivalent to the connection formed by the elastomer 341. The fixed end 301 may be a point or region that is in a relatively stable position during vibration (described in detail below). Elastomer 331 and damping element 332 may be determined depending on the connection means between the headset bracket / headset lanyard and the housing. The above influencing factors for determining elastomers and damping elements include the stiffness, shape or material of the headset bracket / headset lanyard and the material properties of the connection between the headset bracket / headset lanyard and the housing. May be. The headset bracket / headset lanyard may apply pressure between the bone conduction speaker and the user. Depending on the connection means between the panel 321 (or the system formed by the panel and transducer) and the housing 311, the elastomer 341 may be determined. The influencing factor may include the connector 240 described above. The vibration equation may be as shown below.

Where m is the mass of the housing 311, x ₁ is the displacement of the panel 321, x ₂ is the displacement of the housing 311, R is vibration damping, k ₁ is the stiffness coefficient of the elastomer 341, k ₂ is the stiffness coefficient of the elastomer 331. In steady vibration (however, transient response is not considered), the ratio of the housing vibration to the panel vibration x ₂ / x ₁ is expressed as follows.

The ratio of housing vibration to panel vibration x ₂ / x ₁ can reflect sound leakage to some extent. In general, the higher the value of x ₂ / x _1, the greater the vibration of the housing may be correlated with the effective vibration transmitted to the auditory system, and the greater the leakage of sound at the same volume. The smaller the value of x ₂ / x _1, the smaller the housing vibration may be in correlation with the effective vibration transmitted to the hearing system, and the smaller the sound leakage at the same volume. Thus, factors affecting the sound leakage of the bone conduction speaker include the connection means between the panel 321 (or the system including the panel and the transducer) and the housing 311 (stiffness coefficient k _{1 of the} elastomer 341), the headset. A bracket / headset lanyard and a containment system (k ₂ , R, m) may be included. In an embodiment, the stiffness coefficient k ₂ , the housing mass m, and the attenuation R of the elastomer 331 may be correlated to the shape of the bone conduction speaker and the wearing state of the bone conduction speaker. The relationship between x ₂ / x ₁ and the stiffness coefficient k _{1 of} elastomer 341 after k ₂ , m, R, has been determined is shown in FIG. As shown in FIG. 3B, different stiffness coefficients k ₁ may affect the ratio of the housing amplitude to the panel amplitude, x ₂ / x ₁ . When the frequency f exceeds 200 Hz, the vibration of the housing is smaller than the vibration of the panel (x ₂ / x ₁ <1). When f increases, the vibration of the housing may gradually decrease. In particular, as shown in FIG. 3-B, k ₁ (the stiffness coefficient k ₁ from left to right is 5 times, 10 times, 20 times, 40 times, 80 times, and 160 times the value of k _2. If the value of (is) is different, the vibration of the housing is smaller than one-tenth of the vibration of the panel (x ₂ / x ₁ <0.1) when the frequency exceeds 400 Hz. In certain embodiments, reducing the stiffness coefficient k ₁ value effectively reduces housing vibration (eg, using a connector 240 with a low stiffness coefficient), thereby reducing sound leakage. is there.

  In some embodiments, sound leakage may be reduced using a connector with a specific material and a specific connection means. For example, the panel, transducer, and housing may be connected via an elastic connector, and even if the panel amplitude is larger, the housing amplitude may be reduced to reduce sound leakage. . Materials used for the connector include, but are not limited to, stainless steel, beryllium copper, plastic (eg, polycarbonate), and the like. The connector may have a wide variety of shapes. For example, the connector may be annular and at least two rods may converge at the center of the ring. The thickness of the ring may be 0.005 mm or more, preferably the thickness may be 0.005 mm to 3 mm, preferably the thickness may be 0.01 mm to 2 mm, and more preferably the thickness is The thickness may be 0.01 mm to 1 mm, and even more preferably, the thickness may be 0.02 mm to 0.5 mm. In other embodiments, the connector may be an annular plate comprised of a plurality of discontinuous annular holes. There may be a gap between two adjacent annular holes. As another example, a certain number of sound guide holes that meet certain requirements may be configured on the housing or panel (or outside the vibration transfer layer (described in detail below)). When the transducer vibrates, the sound guide hole may transmit the acoustic vibration to the outside of the housing and interfere with the leaked sound wave formed by the vibration of the housing to suppress the sound leakage of the bone conduction speaker. As another example, the housing or at least a part of the housing may be made of a sound absorbing material. The sound absorbing material can be used on at least one surface of the inner or outer surface of the housing, or a part of the inner or outer surface of the housing. The sound absorbing material may refer to a material that can absorb acoustic energy based on a mechanism such as their physical properties (for example, but not limited to porosity), membrane action, reverberation action, and the like. In particular, the sound absorbing material may be a porous material or a material having a porous structure. Although not particularly limited, examples of the sound absorbing material include organic fibrous materials (not particularly limited, for example, natural fibers, organic synthetic fibers, etc.), inorganic fibrous materials (not particularly limited, for example, glass wool, slag wool, rock wool). , And aluminum silicate wool, etc.), metal sound-absorbing material (not particularly limited, for example, metal fiber sound-absorbing plate, metal foam, etc.), rubber sound-absorbing material, foam sound-absorbing material (not particularly limited, such as polyurethane foam, polyvinyl chloride) Foam, polystyrene foam, polyacrylate foam, phenolic resin foam, etc.). The sound absorbing material may be a flexible material that absorbs sound by resonance. Examples thereof include, but are not limited to, closed-cell foam, film-like material (including but not limited to plastic film, cloth, drawing cloth, fabric, or leather), board (not particularly limited, hard board, plaster board, plastic, etc.) Sheet, metal plate, etc.) or perforated plate (for example, a perforated plate obtained by perforating a plate material). The sound absorbing material may be a combination of one or more materials, or may be a composite material. The sound absorbing material may be used on the housing, or may be configured on the vibration transmission layer.

  In the present application, the housing, the vibration transmission layer, and the panel may constitute a vibration unit of the bone conduction unit. The transducer may be disposed within the vibration unit and may transmit vibration to the vibration unit by connecting the housing and the panel. Preferably, 1% or more of the vibration unit may be a sound absorbing material, more preferably 5% or more, and even more preferably 10% or more may be a sound absorbing material. Preferably 5% or more of the housing, more preferably 10% or more, still more preferably 40% or more, and even more preferably 80% or more may be made of a sound absorbing material. In yet another embodiment, the bone conduction speaker has a correction circuit to actively control sound leakage by generating an inverse signal having a phase opposite to the sound leakage depending on the nature of the sound leakage. It may be introduced. In addition, in order to improve the sound quality of the bone conduction speaker, the above embodiment may be selected, or the above embodiment may be combined with other various embodiments. These embodiments are also within the scope of the present disclosure.

  The above description regarding the structure of the vibration generating portion of the bone conduction speaker is merely a specific embodiment and should not be construed as the only possible embodiment. For those skilled in the art, after understanding the above basic principle, it is possible to modify and change specific structures and connection means for generating vibration without departing from the principle. Obviously, it belongs to the scope of the present disclosure as described above. For example, the connection part 250 of FIG. 2-B and FIG. 2-C may be a part of the panel 220, and may be adhere | attached on the transducer 230 using the adhesive agent. The connecting portion 250 may also be a part of the transducer (for example, a convex portion on the vibration board), and may be bonded to the panel 220 using an adhesive. The connecting portion 250 may be another component, and may be bonded to the panel 220 and the transducer 230 using an adhesive. Of course, the method of connecting the connection portion 250 and the panel 220 or the connection portion 250 and the transducer 230 is not limited to adhesion, and those skilled in the art will recognize other connection means (this means is also within the scope of the disclosure of this disclosure). ), For example, can be connected by clamping or soldering. The panel 220 and the housing 210 are preferably directly bonded using an adhesive, more preferably directly bonded by a component such as the elastic member 240, and the outside of the panel (described in detail below). The vibration transmission layer 220 may be added to connect the housing 210. The connection unit 250 is a schematic diagram illustrating connection between various components, and a person skilled in the art replaces the connection unit by using a similar component having a different function but having a similar function. be able to. These alternatives and modifications are also within the scope of this disclosure.

  In step 103, the sound may be transmitted to the auditory system by the delivery system. The delivery system may transmit sonic vibrations directly to the auditory system through the medium and may perform certain processing operations before the sound is transmitted to the auditory system.

  FIG. 4 is an embodiment showing a sound transmission system. When the bone conduction speaker is activated, the speaker 401 may be in contact with the ear, cheek or forehead, and other parts, and may transmit sonic vibrations to the skin 402, subcutaneous tissue 403, bone 404, cochlea 405, Sound may eventually be transmitted to the brain by the auditory nerve. The sound quality that a person receives may be affected by the transmission medium and other factors that affect the physical properties of the transmission medium. For example, skin and subcutaneous tissue density and thickness, bone shape and bone density, and other tissues that vibrations traverse in the course of transmission can affect the final sound quality. Furthermore, in the transmission process, a part of the bone conduction speaker may be in contact with the human body, and the vibration transmission efficiency of the human tissue can affect the final sound quality.

For example, bone conduction speaker panels may transmit vibrations through human tissue to the human auditory system. Therefore, changing the panel material, contact area, shape and / or size, and the force exerted between the panel and the skin may affect the sound transmission efficiency, and as a result, the sound quality will also be affected. Influenced. For example, vibrations transmitted through different sized panels under the same drive may have different distributions on the contact surface between the panel and the wearer. As a result, there is a difference in volume and sound quality. The panel size is preferably 0.15 cm ² or more, more preferably 0.5 cm ² or more, and even more preferably 2 cm ² or more. For example, the panel may vibrate when the transducer vibrates, and the contact point between the panel and the transducer may be the vibration center of the panel. Preferably, the mass distribution of the panel around the center of vibration may be uniform (the center of vibration may be the center of the panel), more preferably the mass distribution of the panel around the center of vibration. May not be uniform (the center of vibration may deviate from the center of the panel). In an embodiment, the diaphragm may be connected to a plurality of panels, and the plurality of panels may have the same shape or different materials. The plurality of panels may or may not be connected to each other. The plurality of panels may transmit vibrations in different ways. In order to generate a steady frequency response, the vibration signal between the different panels may be complementary. In some embodiments, splitting a large diaphragm into smaller diaphragms can reduce inhomogeneous vibrations caused by panel deformation under high frequencies and provide an ideal frequency response. it can.

  It should be noted that physical properties of the panel (for example, mass, size, shape, rigidity, and vibration damping) can affect the vibration efficiency of the panel. A person skilled in the art can select a suitable material for making the panel according to actual requirements, and can also obtain different shaped panels by injection molding. Preferably, the shape of the panel may be a rectangle, a circle, or an oval, and more preferably, the shape of the panel is a rectangle, a circle, or an oval edge cut (eg, symmetrically cut a circle) (E.g., to obtain an oval by doing so) and may be patterned, more preferably the panel may be configured to have a hollow portion on the panel. Although not particularly limited, panel materials include acrylonitrile-butadiene-styrene resin (ABS), polystyrene (PS), high impact polystyrene (HIPS), polypropylene (PP), polyethylene terephthalate (PET), polyester (PES), Polycarbonate (PC), Polyamide (PA), Polyvinyl chloride (PVC), Polyurethane (PU), Polyvinylidene chloride, Polyethylene (PE), Polymethyl methacrylate (PMMA), Polyetheretherketone (PEEK), Phenol resin ( PF), urea resin (UF), melamine resin (MF), metal alloy (for example, aluminum, chromium molybdenum steel, scandium alloy, magnesium alloy, titanium, magnesium, lithium alloy, nickel alloy, etc.), composite material, etc. It is included. Related parameters include relative density, tensile strength, elastic modulus, Rockwell hardness, and the like. Preferably, the relative density of the panel material may be 1.02-1.50, more preferably 1.14-1.45, still more preferably 1.15-1.20. . The tensile strength of the panel may be 30 MPa or more, more preferably 33 MPa to 52 MPa, and still more preferably 60 MPa or more. The elastic modulus of the panel material may be 1.0 GPa to 5.0 GPa, more preferably 1.4 GPa to 3.0 GPa, and still more preferably 1.8 GPa to 2.5 GPa. Similarly, the hardness (Rockwell hardness) of the panel material may be in the range of 60 to 150, more preferably 80 to 120, and still more preferably 90 to 100. In particular, considering both the material and the tensile strength, the relative density may be 1.02 to 1.1, the tensile strength may be 33 MPa to 52 MPa, and more preferably the relative density is 1. It may be 20 to 1.45, and the tensile strength may be 56 to 66 MPa.

  In some embodiments, the outside of the panel may be wrapped with a vibration transmission layer. The vibration transmission layer may be in contact with the skin, and the vibration system including the panel and the vibration transmission layer may transmit sonic vibrations to human tissue. Preferably, the outside of the panel may be covered with one vibration transmission layer, and more preferably may be covered with a plurality of vibration transmission layers. The vibration transmission layer may be made of one or more kinds of materials, and the respective vibration transmission layers may be made of different materials or the same material. The plurality of vibration transmission layers may be laminated in a direction perpendicular to the panel, or may be arranged in a direction parallel to the panel, or a combination of both.

  The material of the vibration transmission layer may have specific adsorption power, flexibility, and specific chemical properties, such as plastic (not particularly limited, polyethylene, blow molded nylon, plastic, etc.), rubber, or Other single materials or composite materials may be used. Although not particularly limited, the rubber includes general-purpose rubber and special rubber. Although not particularly limited, the general-purpose rubber includes natural rubber, isoprene rubber, styrene-butadiene rubber, butadiene rubber, chloroprene rubber, and the like. Although not particularly limited, the special rubber includes nitrile rubber, silicone rubber, fluorine rubber, polysulfide rubber, urethane rubber, epichlorohydrin rubber, acrylic rubber, propylene oxide rubber, and the like. Although not particularly limited, the styrene-butadiene rubber includes an emulsion polymer and a solution polymer. Although not particularly limited, examples of the composite material include reinforcing materials such as glass fiber, carbon fiber, boron fiber, graphite fiber, fiber, graphene fiber, silicon carbide fiber, and aramid fiber. The composite material may be other organic and / or inorganic composite materials such as various types of glass fibers reinforced with unsaturated polyester and epoxy, glass fibers containing a phenolic resin matrix, and the like. Other materials used to form the vibration transmitting layer include silicone, polyurethane, polycarbonate, or combinations thereof.

  The vibration transfer layer may affect the frequency response of the system, may change the sound quality of the bone conduction speaker, and may protect elements in the housing. For example, the vibration transfer layer can smooth the frequency response of the system by changing the vibration mode of the panel. The vibration mode of the panel may be influenced by the panel characteristics, the connection means between the panel and the vibration transmission layer, the vibration frequency, and the like. Panel characteristics include mass, size, shape, stiffness, vibration damping, and the like. Preferably, the thickness of the panel may not be uniform (for example, the thickness of the center may be larger than the thickness of the end portion). The connection means between the panel and the vibration transmission layer may include bonding with an adhesive, mold clamping, welding, and the like. The panel may be connected to the vibration transmission layer using an adhesive. You may make it respond | correspond to the different vibration mode (a deformation | transformation and a deformation | transformation-torsion etc.) of a panel for every frequency. A panel having a specific vibration mode at a specific vibration frequency can change the sound quality of the bone conduction speaker. The range of the specific frequency is preferably 20 Hz to 20000 Hz, more preferably 400 Hz to 10000 Hz, still more preferably 500 Hz to 2000 Hz, and still more preferably 800 Hz to 1500 Hz.

  Preferably, the vibration transmission layer described above may be wrapped on the outside of the panel so as to be on one side of the vibration unit. You may make it have a different vibration transmission characteristic for every area | region on a vibration transmission layer. For example, the vibration transmission layer may include a first contact surface and a second contact surface. Preferably, the first contact surface may not be combined with the panel, and the second contact surface may be combined with the panel. More preferably, when the vibration transmitting layer is in direct or indirect contact with the user, the clamping force on the first contact surface may be smaller than the clamping force on the second contact surface ( Force may refer to the pressure between the vibrating unit and the user). More preferably, the first contact surface may not be in direct contact with the user, and the second contact surface may be in contact with the user to transmit vibration. The area of the first contact surface may not be equal to the area of the second contact surface. Preferably, the area of the first contact surface may be smaller than the area of the second contact surface. More preferably, the first contact surface may be configured to have a hole to reduce the area thereof. The outer end surface (the surface facing the user) of the vibration transmission layer may be smooth or not smooth. Preferably, the first contact surface and the second contact surface may not be on the same surface. More preferably, the second contact surface may be above the first contact surface. More preferably, the first contact surface and the second contact surface may constitute a step structure. Even more preferably, the first contact surface may contact the user and the second contact surface may not contact the user. The first contact surface and the second contact surface may be formed of different materials, may be formed of the same material, or one or more materials used in the above-described vibration transmission layer. May be formed. The above description of the clamping force is only one embodiment of the present disclosure, and those skilled in the art may modify the above structure and method according to actual requirements. However, such modifications are still within the scope of this disclosure. For example, the vibration transfer layer may not be essential, the panel may be in direct contact with the user, and the panel may be configured to have a contact surface that contacts separate areas. Moreover, like the above-mentioned 1st contact surface and 2nd contact surface, another contact surfaces may have a similar characteristic. As another example, the contact surface may include a region of a third contact surface. And the 3rd contact field may be constituted so that it may have a structure different from the structure on the 1st contact field and the 2nd contact field. These structures may also help reduce housing vibration, suppress sound leakage, and improve frequency response.

  FIGS. 5-A and 5-B are specific embodiments showing a front view and a side view, respectively, of the coupling body between the vibration transmitting layer and the panel. The panel 501 and the vibration transmission layer 503 may be bonded using the adhesive 502. Further, the joint formed by the adhesive may be located at two end portions of the panel 501. The panel 501 may be located in a housing formed by the vibration transmission layer 503 and the housing 504. Preferably, the first contact surface may be a region on the vibration transmission layer 503 where the panel 501 is projected, and the second contact region may point to a region around the first contact region. Good.

  The vibration transmission layer and the panel may be completely bonded by an adhesive. At this time, the characteristics of the panel (for example, mass, size, shape, rigidity, vibration damping, vibration mode, etc.) can be changed in the same manner, so that the vibration transmission efficiency can be increased. The vibration transmission layer and the panel may be partially bonded with an adhesive. At this time, even if the air between the panel and the non-adhered region between the transmission layer regions increases the sound conduction of low-frequency vibrations, the sound conduction effect at low to medium frequencies is enhanced. Good. Preferably, the bonded area may be 1% to 98% of the area of the panel. More preferably, the bonded area may be 5% to 90% of the area of the panel. Preferably, the bonded area may be 10% to 60% of the area of the panel. More preferably, the bonded area may be 20% to 40% of the area of the panel. In some embodiments, the adhesive may not be used between the panel and the transmission layer. Moreover, vibration transmission efficiency may differ from the case where an adhesive agent is used, and sound quality may change. In certain embodiments, the vibration mode of the bone conduction speaker components may be altered by changing the manner in which the adhesive is used. In this way, the effect of generating and transmitting sound may be changed. Furthermore, the physical properties of the adhesive (such as hardness, shear strength, tensile strength, and ductility) may affect the sound quality of the bone conduction speaker. Preferably, the adhesive has a tensile strength of 1 MPa or more. More preferably, the tensile strength may be 2 MPa or more. More preferably, the tensile strength may be 5 MPa or more. Preferably, the elongation at break may be in the range of 100% to 500%. More preferably, the elongation at break may be in the range of 200% to 400%. Preferably, the shear strength of the adhesive may be 2 MPa or more, more preferably 3 MPa or more. The Shore hardness of the adhesive is preferably 25-30, and more preferably 30-50. The adhesive may include one type of adhesive or a combination of a plurality of types of adhesive having different physical properties. The adhesive strength between the panel and the adhesive or between the adhesive and the plastic may also be limited to a specific range, and is not particularly limited, but the adhesive strength is, for example, 8 MPa to 14 MPa. May be. Although not particularly limited, the material of the vibration transmission layer includes, for example, silica, plastic, or other materials having specific biological absorbability, flexibility, and chemical resistance. One skilled in the art may choose adhesives, panel materials, and vibration transmission layer materials with different types and different properties according to actual requirements. Thereby, the sound quality may be determined to some extent.

  FIG. 6 is a diagram showing a specific embodiment showing connection means of components of the vibration generating unit of the bone conduction speaker. The transducer may be connected on the housing 620 and the panel 630 may be adhered to the vibration transmitting layer 640 using an adhesive 650. Further, the end of the vibration transmission layer 640 may be connected to the housing 620. In another embodiment, the frequency response may be changed by changing the distribution, hardness, and amount of adhesive 650 or changing the hardness of vibration transmitting layer 640. The sound quality may be changed in this way. Preferably, no adhesive may be present between the panel and the vibration transmission layer. More preferably, the adhesive may be completely applied between the panel and vibration transfer. More preferably, an adhesive may be partially applied between the panel and the vibration transmission layer. Even more preferably, the area where the adhesive between the panel and the vibration transmitting layer is applied may not be larger than the area of the panel.

  One skilled in the art may determine the amount of adhesive according to actual requirements. In some embodiments, as shown in FIG. 7, the frequency response may be affected by another connection means using an adhesive. The three curves correspond to the frequency response with different amounts of adhesive between the vibration transmitting layer and the panel, with no adhesive applied, partially applied adhesive, and adhesion The frequency response in the state which applied the agent completely is shown. When the adhesive is completely applied between the vibration transmission layer and the panel, bone conduction is performed when the adhesive is not applied between the vibration transmission layer and the panel or when the amount of applied adhesive is small. It can be concluded that the resonance frequency of the speaker can shift to a lower frequency region. Adhesive bonding between the vibration transfer layer and the panel may indicate the effect of the vibration transfer layer on the vibration system. Thus, the frequency response curve can be changed by changing the bonding of the adhesive.

  One skilled in the art can adjust or modify the bonding mode and the amount of adhesive according to the actual requirements of the frequency response, thereby improving the sound quality of the system. Similarly, in another embodiment, FIG. 8 illustrates the effect of the vibration transmitting layer having different hardness on the vibration response curve. A solid line is a response curve corresponding to a bone conduction speaker having a harder vibration transmission layer, and a dotted line is a response curve corresponding to a bone conduction speaker having a softer transmission layer. It can be concluded that if the hardness of the vibration transmitting layer is different, the frequency response of the bone conduction speaker is also different. Higher frequency vibrations can be transmitted as the hardness of the vibration transmission layer is larger, and lower frequency vibrations are transmitted as the hardness of the vibration transmission layer is smaller. If the material of the vibration transmission layer (not limited to silica, plastic, etc.) is different, the sound quality may be different. For example, the vibration transmission layer of a 45-degree silica gel bone conduction speaker may have a better high-frequency acoustic effect. The vibration transmission layer of the bone conduction speaker made of silica gel of 75 degrees may have a better low frequency acoustic effect. As used herein, low frequency sound refers to sound at an audible frequency of less than 500 Hz, intermediate frequency refers to sound at an audible frequency ranging from 500 Hz to 4000 Hz, and high frequency sound refers to sound from 4000 Hz. A sound with a high audible frequency.

  Of course, the above description of the vibration transfer layer and adhesive is only one embodiment that affects the sound quality of the bone conduction speaker and should not be construed as the only possible embodiment. After a person skilled in the art understands the basic principle of sound quality of a bone conduction speaker, the components and connection means of the vibration generation part of the bone conduction speaker may be adjusted or modified without departing from the principle. Obviously, modifications are also within the scope of the present disclosure as described above. For example, the vibration transmission layer may be made of any material and may be customized according to the user's usage habits. If the hardness of the adhesive disposed between the vibration transmission layer and the panel is different after curing, the sound quality of the bone conduction speaker may be affected. Furthermore, increasing the thickness of the vibration transmitting layer may have the same effect as increasing the mass of the vibration system. This may reduce the resonant frequency of the system. Preferably, the thickness of the transmission layer may be 0.1 mm to 10 mm. Preferably, the thickness may be 0.3 mm to 5 mm. More preferably, the thickness may be 0.5 mm to 3 mm. Even more preferably, the thickness may be between 1 mm and 2 mm. The tensile strength, viscosity, hardness, tear strength, elongation, etc. of the transmission layer can affect the sound quality of the system. “Tensile strength” refers to the force required to tear the unit area of the sample of the vibration transmitting layer. Preferably, the tensile strength may be 3.0 MPa to 13 MPa. More preferably, the tensile strength may be 4.0 MPa to 12.5 MPa. More preferably, the tensile strength may be 8.7 MPa to 12 MPa. Preferably, the shore hardness of the transmission layer is preferably 5 to 90, more preferably 10 to 80, and even more preferably 20 to 60. The elongation percentage of the transmission layer means an increase rate (%) of the length of the transmission layer with respect to the original length when the transmission layer is torn. Preferably, the elongation percentage may be 90% to 1200%. More preferably, the elongation percentage may be 160% to 700%. More preferably, the elongation percentage may be 300% to 900%. The tear strength refers to a resistance force that prevents a notch or a cut in the transmission layer from spreading when an external force is applied to the transmission layer. Preferably, the tear strength may be 7 kN / m to 70 kN / m. More preferably, the tear strength may be 11 kN / m to 55 kN / m. More preferably, the tear strength may be 17 kN / m to 47 kN / m.

  In the above vibration system including the panel and the vibration transmission layer, in addition to changing the physical properties of the panel and the transmission layer and the connection means, the performance of the bone conduction speaker may be improved from another viewpoint.

  The well-designed vibration generator including the vibration transfer layer can further effectively reduce the sound leakage of the bone conduction speaker. Preferably, the vibration transmission layer having a porous surface may reduce sound leakage. In the embodiment illustrated in FIG. 9, the vibration transmission layer 940 may be adhered to the panel 930 using an adhesive 950, and the convex portion of the bonding region on the vibration transmission layer 940 is formed on the vibration transmission layer 940. It may be larger than the convex portion of the non-bonded region. The cavity may be configured below the non-joining region. The non-bonded region of the vibration transmission layer 940 and the surface of the housing 920 may be configured to have a sound guide hole 960. Preferably, a non-bonded area configured to have several sound guide holes may not contact the user. On the other hand, the sound guide hole 960 may reduce the area of the non-bonded region on the vibration transmission layer 940 so that air flows between the inside and the outside, and the pressure difference between the inside and the outside may be reduced. Thereby, the vibration of the non-bonded region may be reduced. On the other hand, the sound guide hole 960 induces a sound wave generated from the vibration of the air in the housing 920, flows out of the housing 920, cancels the sound leak sound generated by the air coming out of the housing, and reduces the sound leak amplitude. You may make it decrease. Specifically, the sound leakage of the bone conduction speaker at any position in the space may be proportional to the sound pressure P at that point.

Where P ₀ is the sound pressure generated by the housing (including the portion of the vibration transmitting layer not in contact with the skin) at the above position, and P ₁ is from the sound guide hole on the side of the housing at that point. a sound pressure of the transmitted sound, P ₂ is the sound pressure of the sound transmitted from the sound guidance slot located on the vibration transmitting layer. P ₀ , P ₁ and P ₂ are expressed as follows.

Where k is a wave vector, ρ is the density of air, ω is the vibration angular frequency, and R (x ′, y ′) is the distance between the position of the sound source and a position in space. S ₀ is the area of the region that is not in contact with the human face, S ₁ is the opening area of the sound guiding hole on the housing, and S ₂ is the opening area of the sound guiding hole on the vibration transmitting layer. Yes, W (x, y) represents the intensity of the sound source within the unit area, and φ represents the phase difference of the sound pressure caused by different sound sources at a certain point in space. Note that there is a region that does not come into contact with human skin (for example, the end of the vibration transmission layer 940 where the sound guide hole 960 is located in FIG. 9) that vibrates due to vibration from the panel and the housing. Note that it may be communicated. The housing surface area described above may include such a portion on a vibration transmitting layer that may not be in contact with human skin. The sound pressure at any position in space (having an angular frequency ω) can be expressed as:

Our ultimate goal is to achieve the effect of minimizing the value of P and reducing sound leakage. In practical applications, the coefficients A ₁ and A ₂ can be adjusted by adjusting the size and number of sound guide holes. Further, the phase values φ ₁ and φ ₂ can be adjusted by adjusting the location of the sound guide hole. After understanding the principles that vibration systems including panels, transducers, vibration transfer layers and housings can affect the sound quality of bone conduction speakers, those skilled in the art can determine the shape, opening position, number, The purpose of adjusting the size and vibration damping property and suppressing sound leakage can be achieved. For example, there may be one or more sound guide holes, and more preferably two or more sound guide holes. In order to arrange the sound guide holes in a ring shape on the side surface of the housing, one or more sound guide holes may be provided in each region (for example, 4 to 8). The shape of the sound guide hole may be circular, oval, rectangular, or elongated. All of the sound guide holes on the bone conduction speaker may have the same shape, or a combination of a plurality of different shapes. For example, the vibration transmitting layer and the side surface of the housing may be configured to have different shapes and numbers of sound guiding holes, and the density of the sound guiding holes on the vibration transmitting layer is determined by the sound on the side surface of the housing. It may be larger than the density of the guide holes. As another example, a plurality of holes formed on the vibration transmission layer may reduce the area of the vibration transmission layer that does not come into contact with human skin, thereby reducing sound leakage from the portion. Also good. As another example, in order to further suppress sound leakage, a vibration damping material or a sound absorbing material may be disposed in the sound guide hole on the vibration transmission layer or the side surface of the housing. Furthermore, the sound guide holes may be extended to other materials and structures to facilitate the transmission of air vibrations from the housing. For example, a phase adjusting material (such as, but not limited to, a sound absorbing material) used on the housing adjusts the phase of vibration of air from the housing and vibration from other parts of the housing in a range of 90 ° to 270 °. May be. In this way, the sound is canceled out. The description regarding the side of the housing configured to have a sound guide hole is described in Chinese Patent Application No. 201410005804.0 filed on January 6, 2014 (Title of Invention: “Bone Conduction Speaker and its Sound Leakage Suppression Method ", the contents of which are incorporated herein by reference). Still further, the vibration phase of the other part of the housing may be adjusted by adjusting the connection means between the transducer and the housing, and the vibration phase difference may be in the range of 90 ° to 270 °. . This may cancel the sound.

  In some embodiments, the connector between the transducer and the housing may be a flexible connector. Although not particularly limited, connector materials include steel (not particularly limited, such as stainless steel and carbon steel), light alloys (although not particularly limited, such as aluminum, beryllium copper, magnesium alloys, titanium alloys), plastics. (For example, polyethylene, blow molded nylon, plastic, etc.) may be included. The connector material may be a single material or a composite material that achieves similar performance. Although not particularly limited, such composite materials include reinforcing materials such as glass fibers, carbon fibers, boron fibers, graphite fibers, graphene fibers, silicon carbide fibers, aramid fibers, and the like. The composite material may be other organic and / or inorganic composite materials such as various types of glass fibers reinforced with unsaturated polyester and epoxy, glass fibers containing a phenolic resin matrix.

  The thickness of the connector may be 0.005 mm or more, preferably the thickness may be 0.005 mm to 3 mm, more preferably the thickness may be 0.01 mm to 2 mm, and still more preferably. The thickness may be 0.01 mm to 1 mm, and more preferably the thickness may be 0.02 mm to 0.5 mm. The connector may have an annular structure and may have an annular structure that preferably includes at least one, and preferably at least two annular rings. The annular ring may be a concentric ring or a non-concentric ring, which may be connected to each other via at least two rods that converge from the outer ring toward the center of the inner ring. . More preferably, there may be at least one oval ring. More preferably, there may be at least two oval rings. The oval rings may have different radii of curvature, and the oval rings may be connected to each other via a rod. More preferably, there may be at least one angular ring. The connector structure may be plate-shaped. Preferably, a hollow pattern may be configured on the plate. More preferably, the size of the area of the hollow pattern may be equal to or larger than the size of the area of the non-hollow portion of the connector. It should be noted that the above-described connector material, structure, and thickness can be combined in any manner, and a new connector can be newly obtained. For example, the annular connectors may have different film thickness distributions. Preferably, the thickness of the ring may be equal to the thickness of the rod. More preferably, the thickness of the rod may be greater than the thickness of the ring. More preferably, the thickness of the inner ring may be greater than the thickness of the outer ring.

  The above description of the sound absorbing holes is merely an embodiment of the present disclosure, and may limit the aspect of improving the sound quality of the bone conduction speaker and suppressing sound leakage. Those skilled in the art can modify or improve the above-described embodiment. However, these modifications and improvements are still within the above-mentioned range. For example, preferably, the sound guide hole may be disposed on the vibration transmission layer. Preferably, the sound guide hole may be disposed only on the region of the vibration transmission layer, and does not have to coincide with the panel. More preferably, the sound guide hole may be disposed only in a region that does not contact the user. More preferably, the sound guide hole may be disposed inside the vibration unit to form a cavity. As another example, the sound guide hole may be disposed in the bottom wall of the housing, and one sound guide hole may be disposed in the center of the bottom wall, and is annularly formed around the center of the bottom wall. There may be two or more sound guide holes arranged uniformly.

  The above description of vibration transmission in a bone conduction speaker is merely a specific embodiment and should not be construed as the only possible embodiment. After a person skilled in the art understands the basic principle of a bone conduction speaker, various modifications and changes can be made to the type and details of the bone conduction speaker, and these changes and modifications are also disclosed in the present disclosure as described above. It is clear that it belongs to the range. For example, an implantable bone conduction hearing aid can be directly brought into close contact with the bone to directly transmit the sonic vibration to the bone without going through the skin or the subcutaneous tissue. This may avoid attenuation or alteration of the frequency response caused by skin or subcutaneous tissue in the vibration transmission process. As another example, in some application scenarios, teeth may be used for sound conduction. That is, the vibration of sound may be transmitted to the bone and surrounding tissue through the teeth by bringing the bone conduction device into contact with the teeth. In this way, the influence of the skin on the frequency response during the vibration process may be reduced. The above description of the application of the bone conduction speaker is merely a specific embodiment, and those skilled in the art may use the bone conduction speaker in different scenarios after understanding the basic principles of the bone conduction speaker. According to the above description, sound transmission in the application scenario can be partially changed according to the above description. However, these changes are still within the scope of the above description.

  In step 104, the sound quality perceived by a human is also related to the human auditory system. In each person, the sensitivity to sounds of different frequencies can vary. In some embodiments, the level of sensitivity to sounds of different frequencies may be indicated by an equal loudness curve. Some people are less sensitive to audio signals in a particular frequency range, and the equi-loudness curve may have a lower response intensity at the corresponding frequency than at other frequencies. For example, some people are less sensitive to high frequency audio signals, and the response strength of high frequency audio signals may be lower than the response strength of audio signals of other frequencies. Some people are less sensitive to low-frequency audio signals, and the response strength of low-frequency audio signals may be lower than the response strength of audio signals of other frequencies. In this specification, a low frequency sound means a sound having a frequency of less than 500 Hz, an intermediate frequency sound means a sound having a frequency of 500 Hz to 4000 Hz, and a high frequency sound means a sound having a frequency exceeding 4000 Hz. .

  Of course, the low and high frequencies of sound are relative, and for a particular person, the auditory system may show different responses for different frequency ranges of sound. By selectively changing or adjusting the distribution of sound intensity within the corresponding frequency range generated by the bone conduction speaker, a specific per-person hearing experience can be obtained. Note that the high frequency, intermediate frequency, or low frequency audio signals discussed above may be used to describe the normal human listening range and from the natural world where the speakers need to be transmitted. It may be used to describe a range of sounds.

  In an embodiment, the equal loudness curve of a particular person's auditory system may be the curve 3 shown in FIG. Peak near point A is more sensitive to sounds at frequencies corresponding to point A than to other points at different frequencies (eg, point B shown in FIG. 10). Is shown. Frequencies that are less sensitive to the human auditory system can be compensated when designing a bone conduction speaker. A curve 4 is a corrected frequency response curve for the curve 3, and a resonance peak appears near the point B. When listening to sound with the ear, the frequency response curve 4 generated by the bone conduction speaker may be combined with the frequency response curve 3, thereby making the sound heard by humans more ideal and the audible frequency range. May be wider. In some embodiments, the frequency at point A may be about 500 Hz and the frequency at point B may be about 2000 Hz. It should be noted that the above embodiment for compensating for a specific frequency of a bone conduction speaker should not be construed as the only realistic embodiment, and that a person skilled in the art will understand the principle and It should be noted that a method for compensating an appropriate peak value or frequency may be set according to the application.

  After a person skilled in the art understands the basic principle of a bone conduction speaker, various modifications and changes can be made to the type and details of the vibration of the bone conduction speaker. It is clear that it belongs to the scope of the disclosure. For example, the above-described method for compensating the frequency response of a bone conduction speaker may be applied to a bone conduction hearing aid. For persons with hearing impairment, one or more frequency response characteristics of a bone conduction hearing aid may be designed to compensate for the insensitivity to a particular frequency range. In practical applications, the bone conduction hearing aid may intelligently select or adjust the frequency response based on user input. For example, the system may automatically obtain the user's equal loudness curve, or the user may enter his own equal loudness curve. The system may then compensate for the specific frequency response of the bone conduction speaker based on its isoloudness curve. In one embodiment, for a point with a relatively low loudness (eg, the smallest point on the curve) of an equal loudness curve, the amplitude of the frequency response of the bone conduction speaker near that point is amplified to a desired value. Sound quality may be obtained. Similarly, for a point with a relatively high loudness (eg, the largest point on the curve) of the equal loudness curve, the amplitude of the frequency response of the bone conduction speaker near that point may be reduced. Furthermore, there may be a plurality of local maximum points or local minimum points on the frequency response curve or the equal loudness curve, and the corresponding compensation curve (frequency response curve) may have a plurality of local maximum values or local minimum values. . For those skilled in the art, in the above description regarding the auditory sensitivity, the “equal loudness curve” may be replaced by a similar language such as “loudness curve”, “auditory response curve”, and the like. Indeed, auditory sensitivity may be considered as a frequency response of sound, and in the description of various embodiments of the present disclosure, the sound quality of a bone conduction speaker combines the human sensitivity to sound with the frequency response of the bone conduction speaker. May be obtained.

In general, the sound quality of bone conduction speakers depends on various factors such as the physical properties of components, the relationship of vibration transmission between components, the relationship of vibration transmission between the speaker and the external environment, and the vibration transmission efficiency of the vibration transmission system. May be affected. The components of the bone conduction speaker include a vibration generating member (for example, a transducer), a member for fixing the speaker (for example, a headset bracket / headset lanyard), and a vibration transmitting member (for example, a panel and a vibration transmitting layer). It is. The relationship of vibration transmission between the components and between the speaker and the external environment can be determined by the manner in which the speaker contacts the user (eg, clamping force, contact area, contact shape). FIG. 11 is an equivalent diagram showing a vibration generation and vibration transmission system of a bone conduction speaker. The bone conduction speaker equivalent system may include a fixed end 1101, a sensor terminal 1102, a vibration unit 1103, and a transducer 1104. The fixed end 1101 may be connected to the vibration unit 1103 through the transmission relationship K1 (ie, k ₄ in FIG. 4), and the sensor terminal 1102 is connected to the vibration unit 1103 through the transmission relationship K2 (ie, R ₃ and k _{3 in} FIG. 4). It may be connected to. The vibration unit 1103 may be connected to the transducer 1104 through the transmission relationship K3 (R ₄ , k _{5 in} FIG. 4).

  The vibration unit 1103 may include a panel and a transducer. The transmission relationships K1, K2 and K3 may be used to describe the relationship between corresponding components in the equivalent system of a bone conduction speaker (described in detail below). The vibration equation of the equivalent system is expressed as follows.

Where m ₃ is the equivalent mass of the vibration unit 1103, m ₄ is the equivalent mass of the transducer 1104, x ₃ is the equivalent displacement of the vibration unit 1103, and x ₄ is the equivalent displacement of the transducer 1104. . k ₃ is an equivalent elastic coefficient between the sensor terminal 1102 and the vibration unit 1103. k ₄ is an equivalent elastic coefficient between the fixed end 1101 and the vibration unit 1103. k ₅ is an equivalent elastic modulus between the transducer 1104 and the vibration unit 1103. R ₃ is an equivalent attenuation between the sensor terminal 1102 and the vibration unit 1103, and R ₄ is an equivalent attenuation between the transducer 1104 and the vibration unit 1103. f ₃ and f ₄ are interaction forces between the vibration unit 1103 and the transducer 1104. Equivalent amplitude of the vibration unit A ₃ is represented as the following equation.

In the formula, f ₀ represents the unit propulsion force, and ω represents the vibration frequency. Factors that affect the frequency response of the bone conduction speaker include generation of vibrations (including but not limited to vibration units, transducers, housings, and connecting means between each, such as m ₃ , m ₄ in equation (10), k ₅ , R ₄ ), transmission of vibrations (including, but not limited to, the mode of contact with the skin, the characteristics of the headset bracket / headset lanyard (k ₃ , k ₄ , R ₃ etc. in equation (10)) The frequency response and sound quality of bone conduction speakers can be influenced by changing the structure of each component and the parameters of the connection between each component of the bone conduction speaker, for example the size of the clamping force. changing the in some cases is equivalent to changing the k _4, varying the binding of an adhesive is equivalent to varying the R ₄ and k ₅ In some cases, changing the hardness, elastic force, damping of the associated material may be equivalent to changing k ₃ and R ₃ .

  In some embodiments, the position of the fixed end 1101 refers to a point or region that is relatively fixed to several positions in the vibration process. These points or regions may be considered fixed ends. The fixed end may consist of a particular component or may be determined by the structure of the bone conduction speaker. For example, a bone conduction speaker may be suspended, attached or adsorbed around a person's ear, and humans through the above structure of bone conduction speaker or a special design to realize the above appearance. It may be fixed to the skin.

  The sensor terminal 1102 may be a human auditory system for receiving an audio signal. The vibration unit 1103 may be used to protect, support and connect the transducer. The vibration unit 1103 includes a vibration transmission layer for transmitting vibration to the user, a panel in direct or indirect contact with the user, and a housing for protecting and supporting other vibration generating components. May be included. The transducer 1104 may generate sonic vibrations.

  The transmission relationship K1 may connect the fixed end 1101 and the vibration unit 1103. A transmission relationship K1 indicates a vibration transmission relationship between the fixed end and the vibration generation unit. K1 may be determined based on the shape and structure of the bone conduction speaker. For example, the bone conduction speaker may be worn on a person's head by a U-shaped headset bracket / headset lanyard. The bone conduction speaker may be placed on a helmet, a fire mask, or a specific mask, glasses, or the like. If the structure or shape of the bone conduction speaker is different, the transmission relationship K1 may be affected. Further, the structure of the bone conduction speaker may include materials, masses, and the like of different parts of the bone conduction speaker. The transmission relationship K2 may connect the sensor terminal 1102 and the vibration unit 1103.

  K2 may depend on the components of the transmission system. Although not particularly limited, the transmission may include transmitting sound through the user's tissue to the user's auditory system. For example, when sound is transferred to the auditory system through skin, subcutaneous tissue, bone, etc., the physical properties of various components and the interconnections of the various components can affect K2. Further, in various embodiments, the vibration unit 1103 may be in contact with the tissue, and the contact surface in this case may be the side surface of the vibration transmission layer or the panel. The force between 1103 and the tissue may affect the transfer coefficient K2.

  The transfer coefficient K3 between the vibration unit 1103 and the transducer 1104 may depend on the connection characteristics inside the vibration generation unit of the bone conduction speaker. The transducer and the vibration unit may be firmly connected or may be flexibly connected. In addition, changing the relative position of the connector between the vibration unit and the transducer can affect the transducer that transmits vibration to the vibration unit (especially the transmission efficiency of the panel), thereby transmitting The relationship K3 can also be affected.

  When using a bone conduction speaker, the method of sound generation and transmission can affect the sound quality felt by the user. For example, the fixed end, the measurement terminal, the vibration unit, the transducer, and the transmission relations K1, K2, and K3 described above may affect the sound quality. Note that K1, K2 and K3 are merely described for connecting different parts of the apparatus, and are not particularly limited. However, the system includes a physical connection system, a power transmission system, a sound transmission efficiency, and the like. I want to keep in mind that it is included.

  The description of the bone conduction speaker equivalent system is merely a specific embodiment and should not be understood as the only realistic embodiment. After a person skilled in the art understands the basic principle of a bone conduction speaker, various modifications and changes can be made to the type and details of the bone conduction speaker, and these changes and modifications are also disclosed as described above. It is clear that it belongs to the range. For example, K1, K2, and K3 described above may refer to simple vibrations, mechanical transmission modes, or may include complex non-linear transmission systems. The transmission relationship may be formed by directional connections between the parts or may be transmitted in a non-contact manner.

  FIG. 12 is a diagram illustrating a structure of a bone conduction speaker according to a part of the embodiment of the present disclosure. As shown in the figure, the bone conduction speaker may include a headset bracket / headset lanyard 1201, a vibration unit 1202, and a transducer 1203. The vibration unit 1202 may include a contact surface 1202a and a housing 1202b. The transducer 1203 is set in the vibration unit 1202 and connected to the vibration unit 1202. Preferably, the vibration unit 1202 may further include a panel and a vibration transmission layer (which may be described above). The contact surface 1202a may be a surface that contacts both the vibration unit 1202 and the user. Preferably, the contact surface 1202a may be an outer surface of the vibration transmission layer.

  During use, the bone conduction speaker may be secured to a special part of the user's body (eg, head) by a headset bracket / headset lanyard 1201. Thereby, a tightening force may be applied between the vibration unit 1202 and the user. The contact surface 1202a may be connected to the transducer 1203, and may be kept in contact with the user to transmit vibration to the user. The relative fixation position when the bone conduction speaker is activated may be selected as the fixation end 1101, as illustrated in FIG. In some embodiments of the present disclosure, the bone conduction speaker has a symmetrical structure. Also, the driving forces provided by the transducers provided on the two side surfaces are equal and directly opposite. Thus, the midpoint of the headset bracket / headset lanyard can be selected as an equivalent fixed end (eg, position 1204). In some other embodiments, the driving force provided by the transducers on the two sides is non-uniform. The bone conduction speaker produces stereo or the bone conduction speaker has an asymmetric structure and selects other locations or areas on or away from the headset bracket / headset lanyard as equivalent fixed ends Also good. The fixed end described in this application may be an equivalent end that is relatively fixed when the bone conduction speaker operates. The fixed end 1101 and the vibration unit 1202 may be connected by a headset bracket / headset lanyard 1201. The transmission relationship K1 may be related to the headset bracket / headset lanyard 1201 and the tightening force provided by the headset bracket / headset lanyard 1201. The tightening force depends on the physical properties of the headset bracket / headset lanyard 1201. Preferably, the physical displacement parameters (eg, tightening force, weight, etc.) of the headset bracket / headset lanyard 1201 can change the sound transmission efficiency of the bone conduction speaker and affect the frequency response of a specific frequency range. Can affect. For example, different tightening forces can be applied by applying headset brackets / headset lanyards of materials with different strengths. Changing the structure of the headset bracket / headset lanyard (eg, by adding an auxiliary device having elasticity) may change the tightening force and affect the sound transmission efficiency. Different sizes of the headset bracket / headset lanyard can affect the clamping force. The clamping force increases as the distance between the two vibration units decreases.

  To obtain a headset bracket / headset lanyard with a certain tightening force, one skilled in the art may implement variations or modifications based on the actual situation. For example, based on the teachings of the present disclosure, a headset bracket / headset lanyard with different stiffness and elastic coefficients may be selected, or the size of the headset bracket / headset lanyard may be changed. It should be noted that changing the tightening force can affect not only the sound transmission efficiency, but also the user experience in the lower frequency range. The clamping force in this application means the pressure between a contact surface and a user. Preferably, the clamping force is between 0.1N and 5N. Preferably, the tightening force is in the range of 0.1N to 4N. More preferably, the tightening force is in the range of 0.2N to 3N. More preferably, the tightening force is in the range of 0.2N to 1.5N. More preferably, the tightening force is in the range of 0.3N to 1.5N.

  The tightening force of the headset bracket / headset lanyard may be determined by the material. Preferably, the material used for the headset bracket / headset lanyard is a plastic having a specific hardness and is not particularly limited. For example, acrylonitrile-butadiene-styrene (ABS), polystyrene (PS), high impact Polystyrene (HIPS), polypropylene (PP), polyethylene terephthalate (PET), polyester (PES), polycarbonate (PC), polyamide (PA), polyvinyl chloride (PVC), polyurethane (PU), polyvinylidene chloride, polyethylene (PE ), Polymethyl methacrylate (PMMA), polyetheretherketone (PEEK), melamine formaldehyde (MF), etc., or combinations thereof. More preferably, the material for the headset bracket / headset lanyard is metal, alloy (for example, aluminum alloy, chromium-molybdenum alloy, scandium alloy, magnesium alloy, titanium alloy. Magnesium-lithium alloy, nickel alloy). Or compensation, etc. may be included.

  Further, the material of the headset bracket / headset lanyard may include a memory material. Although not particularly limited, the memory material may include a memory alloy, a memory polymer, a memory inorganic material, and the like. Memory alloys include titanium-nickel copper memory alloy, titanium-nickel-iron memory alloy, titanium-nickel-chromium memory alloy, copper-nickel memory alloy, copper-aluminum memory alloy, copper-zinc memory alloy, iron-based Memory alloys and the like may be included. Although not particularly limited, memory polymers include polynorbornene, trans-polyisoprene, styrene-butadiene copolymers, crosslinked polyethylene, polyurethanes, lactones, fluorine-containing polymers, polyamides, crosslinked polyolefins, polyesters, and the like. Also good. Although not particularly limited, the inorganic material may include memory ceramic, memory glass, garnet, mica, and the like.

  Furthermore, the memory material may have a selected memory temperature. Preferably, the memory temperature may be 10 ° C. or higher. More preferably, the memory temperature may be 40 ° C. or higher. More preferably, the memory temperature may be 60 ° C. or higher. More preferably, the memory temperature may be 100 ° C. or higher. The percentage of memory material in the headset bracket / headset lanyard may be 5% or more. More preferably, the ratio may be 7% or more. More preferably, the ratio may be 15% or more. More preferably, the ratio may be 30% or more. More preferably, the ratio may be 50%.

  In the present application, the headset bracket / headset lanyard means a back-hanging structure that gives a tightening force to the bone conduction speaker. The memory material may be in a different location than the location of the headset bracket / headset lanyard. Preferably, the memory material may be in a position where pressure is concentrated on the headset bracket / headset lanyard, and is not particularly limited, for example, a joint between the headset bracket / headset lanyard and the vibration unit, headset The center of symmetry of the bracket / headset lanyard may be at a location where the lines in the headset bracket / headset lanyard are concentrated. In some embodiments, the headset bracket / headset lanyard may be made of a memory alloy, which reduces the difference in tightening force between different users and is affected by the tightening force. The consistency of the is improved. In some embodiments, the headset bracket / headset lanyard made of memory alloy may have sufficient elasticity so that it can return to its original shape after being greatly deformed. Also good. In addition, the tightening force may be stably maintained even after being deformed for a long time. In some embodiments, the headset bracket / headset lanyard made of memory alloy may be light enough to give large deformations and distortions, may have sufficient flexibility, and is better worn by the user. It is better.

  The tightening force applies pressure between the surface of the vibration generating portion of the bone conduction speaker and the user. 13-A and 13-B are embodiments showing vibration response curves for different pressures between the contact surface and the user. If the tightening force is lower than a certain threshold value, it may not be suitable for transmission of high-frequency vibrations. As shown in FIG. 13-A, for the same vibration source (sound source), the intermediate frequency vibration (sound) and high frequency vibration (sound) received by the user when the tightening force is 0.1 N are the tightening force. May be less than in the case of 0.2N and 1.5N. That is, the effect of the intermediate frequency and high frequency portions at 0.1N may be weaker than the effect at 0.2N to 1.5N. Similarly, if the tightening force is higher than a certain threshold value, it may not be suitable for transmitting low-frequency vibrations. As shown in FIG. 13B, for the same vibration source (sound source), the intermediate frequency vibration (sound) and low frequency vibration (sound) received by the user when the tightening force is 5.0 N are the tightening force. May be less than in the case of 0.2N and 1.5N. That is, the effect of the low frequency part at 5.0N may be weaker than the effect at 0.2N to 1.5N.

  In some embodiments, the pressure between the contact surface and the user is kept within a specific range based on the proper choice of headset bracket / headset lanyard material and the appropriate headset bracket / headset lanyard structure. You may lean. The pressure between the contact surface and the user may be greater than a threshold value. Preferably, the threshold is 0.1N. Preferably, the threshold is 0.2N. More preferably, the threshold is 0.3N. More preferably, the threshold is 0.5N. For those skilled in the art, in the light of the principle that the tightening force provided by the bone conduction speaker changes the frequency response of the bone conduction system, a certain amount of modification or change is made to the material and structure of the headset bracket / headset lanyard. Alternatively, a tightening force range that satisfies different sound quality requirements may be set. However, those changes and modifications are not derived from the scope of the present disclosure.

  The tightening force of the bone conduction speaker may be tested with a specific device or method. 14-A and 14-B show examples of embodiments for testing the tightening force of bone conduction speakers. Points A and B may be near the vibration unit of the bone conduction speaker headset bracket / headset lanyard. In the test process, one of point A or point B may be fixed and another point of point A or point B except the fixed point may be connected to the pressure gauge. When the distance between the point A and the point B is in the range of 125 mm to 155 mm, a tightening force can be obtained. FIG. 14-C shows three frequency vibration response curves corresponding to different tightening forces of the bone conduction speaker. The tightening forces corresponding to the three curves may be 0N, 0.61N, and 1.05N, respectively. FIG. 14-C shows that the load on the vibration unit of the bone conduction speaker, which may be generated by the user's face, increases as the tightening force of the bone conduction speaker increases and the vibration from the vibration region may decrease. Is shown. When the tightening force is too small or the tightening force is too large, the bone conduction speaker having the tightening force has uneven frequency response during vibration (for example, 500 Hz on the curves corresponding to 0N and 1.05N, respectively). To 800 Hz range). If the tightening force is too large (for example, in the case of a curve corresponding to 1.05N), the user may feel uncomfortable, reducing the vibration of the bone conduction speaker and reducing the volume. If the tightening force is too small (for example, in the case of a curve corresponding to 0N), the user may feel more clearly that the bone conduction speaker is vibrating.

  It should be noted that the above description of changing the tightening force of the bone conduction speaker is provided for illustrative purposes only and does not represent the only possible embodiment. It will be apparent to those skilled in the art that in light of the principles of bone conduction speakers, multiple variations can be implemented for changing the tightening force of the bone conduction speaker. However, those variations are not derived from the scope of the present disclosure. For example, the memory material can be used in a headset bracket of a bone conduction speaker. This may allow the bone conduction speaker to have an angle that can be adapted to another user's head, may have good elasticity, increase the comfort when wearing the bone conduction speaker It may also be easy to adjust the tightening force. Further, as shown in FIG. 15, an elastic bandage 1501 used for adjusting the tightening force may be provided on the headset bracket of the bone conduction speaker. The elastic bandage can provide additional resiliency when the headset bracket / headset lanyard is compressed or stretched away from the balanced position.

  The transmission relationship K2 between the sensor terminal 1102 and the vibration unit 1103 may affect the frequency response of the bone conduction system. The volume heard by the user's ear depends on the energy received by the user's cochlea. The energy can be affected by various parameters during transmission. The energy can be expressed by the following formula.

P is linearly related to the energy received by the cochlea. S is a contact area between the contact surface 502a and the user's face. α is a coefficient of dimensional change. f (a, R) represents an action between the acceleration a of the point on the contact surface and the contact adhesion R between the contact surface and the user's skin during energy transmission. L is the attenuation of an arbitrary contact point on the transmission of mechanical waves, that is, the transfer impedance per unit area.

  Regarding (11), the transfer impedance L may affect the transmission of sound. Moreover, the vibration transmission efficiency of the bone conduction system may be related to the transmission impedance L. The frequency response curve of the bone conduction system may be a superposition of frequency response curves at multiple points on the contact surface. Factors that change the impedance may include the size of the energy transmission region, the shape of the energy transmission region, the roughness of the energy transmission region, the pressure on the energy transmission region, or the pressure distribution on the energy transmission region. For example, the sound transmission effect may vary when the structure and shape of the vibration unit 1202 are changed, which may change the sound quality of the bone conduction speaker. However, the sound transmission effect may be changed by changing the corresponding physical characteristics of the contact surface 1202a of the vibration unit 1202.

  A well-designed contact surface may have a gradient structure. At this time, the gradient structure may refer to regions having various heights on the contact surface. The gradient structure may be a concavo-convex portion present on the outside (side facing the user) or inside (opposite the user) of the contact surface, or may have a stepped shape. One embodiment of a vibration unit of a bone conduction speaker may be as illustrated in FIG. 16-A. The uneven portion (not shown in FIG. 16A) may be present on the contact surface 1601 (outside the contact surface). During the operation of the bone conduction speaker, the concavo-convex portion may be in contact with the user's face, thereby changing the pressure between the position and the user's face for each position on the contact surface 1601. In this way, the convex portion may be in closer contact with the user's face, and this may increase the pressure on the user's skin or tissue in contact with the convex portion. In addition, the pressure on the user's skin and tissue in contact with the recess may be reduced.

For example, the three points A, B, and C on the contact surface 1601 in FIG. 16A may be located in a portion without a convex portion, an end portion of the convex portion, and a concave portion, respectively. When in contact with the user's skin, the clamping forces F _A , F _B , and F _C on the three points may be F _C > F _A > F _B. In some embodiments, the clamping force on point B is zero, ie, B may not be in contact with the user's skin. The skin and tissue of the user's face may differ in impedance and response at different pressures. The portion where the pressure is larger may correspond to the portion where the impedance ratio is smaller, and may have a high-pass filtering characteristic with respect to the sound wave. The portion where the pressure is smaller may correspond to the portion where the impedance ratio is larger, and may have a low-pass filtering characteristic for the sound wave.

  When the contact surface 1601 is different, the impedance characteristic L may be different. According to equation (1), different parts may have different frequency responses to sound transmission. The sound transmission effect through the entire contact surface may be equal to the sum of the sound transmission effects through the portions of the contact surface. When sound is transmitted to the user's brain, a smooth curve may be formed, thereby avoiding excessive harmonic peaks occurring at low or high frequencies. In this way, an ideal frequency response can be obtained over the entire bandwidth. Similarly, the material and thickness of the contact surface 1601 may affect the sound transmission effect, thereby affecting the sound quality. For example, when the contact surface is soft, the sound transmission effect in the low frequency range may be better than in the high frequency range. When the contact surface is hard, the sound transmission effect in the high frequency region may be better than in the low frequency region.

  FIG. 16-B shows the response curves of bone conduction speakers with different contact areas. The dotted line may correspond to the frequency response of a bone conduction speaker having a protrusion on the contact surface. The solid line may correspond to the frequency response of the bone conduction speaker where there is no protrusion on the contact surface. In the frequency range from the low frequency to the intermediate frequency, the vibration of the portion without the convex portion may be weaker than the vibration of the convex portion. As a result, a “pit” may be formed on the frequency response curve. As a result, the frequency response is non-ideal and can affect sound quality.

  The above description with respect to FIG. 16-B is only a specific embodiment, and those skilled in the art will be able to make various modifications or changes to the structure and components after understanding the basic principles of the bone conduction speaker. A frequency response effect can be achieved.

  It should be noted to those skilled in the art that the shape and structure of the contact surface are not limited to those described above. In a part of the embodiments, the convex portion or the concave portion may be located at the end of the contact surface, or may be located at the center of the contact surface. The contact surface may include one or more convex portions or concave portions. Both the convex portion or the concave portion may be on the contact surface. The material constituting the convex portion or the concave portion may be a material different from the material constituting the contact surface, for example, a flexible material, a hard material, a material that can easily generate a specific pressure gradient, or the like. . The material may be a memory material or a non-memory material. The material may be a single material or a composite material. The structural pattern of the convex portion or concave portion of the contact surface is not particularly limited, but includes an axially symmetric pattern, a centrally symmetric pattern, a rotationally symmetric pattern, and an asymmetric pattern. The structural pattern of protrusions or recesses on the contact surface may include one pattern, two patterns, or a combination of two or more patterns. Although not particularly limited, the contact surface may have some degree of smoothness, roughness, undulation, and the like. Although not particularly limited, the distribution of convex portions or concave portions on the contact surface includes axial symmetry, central symmetry, rotational symmetry, and asymmetry. The convex portion or the concave portion may be configured to be located at an end portion of the contact surface, or may be disposed at the center of the contact surface.

  Reference numerals 1704 to 0709 in FIG. 17 are embodiments of the structure of the contact surface.

  Reference numeral 1704 in FIG. 17 indicates a plurality of convex portions having the same shape and structure on the contact surface. The convex portion may be made of the same material as the other portions on the panel or a similar material, or may be made of a different material. In particular, the convex portion may be made of a memory material and a vibration transmission layer material, and at this time, the ratio of the memory material may be 10% or more. Preferably, the ratio may be 50% or more. The area per one convex portion may be 1% to 80% of the total area, preferably 5% to 70%, more preferably 8% to 40%. The total area of the convex portions may be 5% to 80%, preferably 10% to 60% of the total area. There may be at least one convex part, preferably one convex part, more preferably two convex parts, and still more preferably at least five convex parts. The shape of the convex portion may be a circle, an oval, a triangle, a rectangle, a trapezoid, an irregular polygon, or other similar pattern. The structure of the convex portion may be symmetric or asymmetric. The distribution of the convex portions may be a symmetric distribution or an asymmetric distribution. The number of convex portions may be one or more, and the height of the convex portions may be the same or different. The distribution of the heights of the convex portions may form a specific gradient.

  Reference numeral 1705 in FIG. 17 shows an embodiment of a convex portion on the contact surface having two or more structural patterns. There may be one or more protrusions of different patterns. The shape of the two or more protrusions may be a circle, an oval, a triangle, a rectangle, a trapezoid, an irregular polygon, other shapes, or a combination of two or more shapes. The material, amount, size, and symmetry of the protrusion may be the same as those described for 1704.

  Reference numeral 1706 in FIG. 17 shows an embodiment of a convex portion that may be distributed at the end of the contact surface or within the contact surface. The number of convex portions located at the end of the contact surface may be 1% to 80% of the total number of convex portions, preferably 5% to 70%, more preferably 10% to 50%, more preferably It may be 30% to 40%. The material, amount, size, and symmetry of the protrusion may be the same as those described for 1704.

  Reference numeral 1707 in FIG. 17 indicates the structure of the recess on the contact surface. The structure of the recess may be symmetric or asymmetric. The distribution of the recesses may be symmetric or asymmetric. Further, the number of recesses may be one or more, and the shape of the recesses may be the same or different. The recess may be hollow. The area of one recess may be 1% to 80% of the total area of the contact surface, preferably 5% to 70%, more preferably 8% to 40%. The total area of the recesses may be 5% to 80% of the total area, preferably 10% to 60%. There may be at least one recess, preferably one recess, more preferably two recesses, and even more preferably at least five recesses. The shape of the recess may be a circle, oval, triangle, rectangle, trapezoid, irregular polygon, or other similar pattern.

  Reference numeral 1708 in FIG. 17 denotes a contact surface including a convex portion and a concave portion. There may be one or more convex portions and one or more concave portions. The ratio of the number of concave portions to convex portions may be 0.1% to 100%, preferably 1% to 80%, more preferably 5% to 60%, still more preferably 10% to 20%. Also good. The material, amount, size, and symmetry of each convex portion or each concave portion may be the same as those described for 1704.

  Reference numeral 1709 in FIG. 17 shows an embodiment of a contact surface having a specific undulation. The swell may be formed by two or more uneven portions. Preferably, the distance between adjacent uneven parts may be equal. More preferably, the distance between the concavo-convex portions may be represented by an arithmetic progression.

  1710 of FIG. 17 shows an embodiment of a convex portion having a large area on the contact surface. The area of the convex part may be 30% to 80% of the total area of the contact surface. Preferably, a part of the end of the convex part may substantially contact with a part of the end of the contact surface.

  1711 of FIG. 17 shows the 1st convex part which has a large area on a contact surface, and the 2nd convex part which has a smaller area provided on the 1st convex part. The area of the convex part having a larger area may be 30% to 80% of the total area, and the area of the convex part having a smaller area may be 1% to 30% of the total area, preferably 5%. ~ 20%. The area of the smaller region may be 5% to 80% of the area of the larger region, and is preferably 10% to 30%.

  The above description of the structure of the contact surface of the bone conduction speaker is merely a specific embodiment and should not be construed as the only possible embodiment. After a person skilled in the art understands the basic principles of a bone conduction speaker, various modifications and changes can be made to the steps and details of the contact surface of the bone conduction speaker, and these changes and modifications are also described above. It is clear that it belongs to the scope of the present disclosure. For example, the number of protrusions and recesses is not limited to that shown in FIG. 17, and modifications made to the pattern of the protrusions, recesses, or contact surface are still within the scope of the above description. Furthermore, the contact surface of at least one vibration unit of the bone conduction speaker may have the same shape and material, or may have a different shape and material. The action of vibrations transmitted through different contact surfaces may differ depending on the characteristics of the contact surfaces, and as a result, different acoustic effects may occur.

  As shown in FIG. 11, the vibration mode of the transducer 1104 of the vibration system of the bone conduction speaker and the connection means K3 between the transducer 1104 and the vibration unit 1103 may affect the acoustic effect of the system. Preferably, the transducer may include a vibration board, a vibration conducting plate, a set of coils, and a magnetic circulation system. More preferably, the transducer may include a composite vibration device having a plurality of vibration boards and vibration conducting plates. The frequency response of the system for generating sound can be affected by the physical properties of the vibration board and the vibration conducting plate. Further, a vibration board and a vibration conductive plate having a specific size, shape, material, thickness, vibration transmission mode, and the like may be selected to meet actual requirements.

  18-B and 18-A are embodiments of the composite vibration device. The composite vibration device may include a composite vibration constituent member including a vibration conductive plate 1801 and a vibration board 1802. The vibration conducting plate 1801 may be configured as the first ring 1813. Further, it may be configured to have three first rods 1814 that converge at the center of the first ring. The convergence center of the three first rods may be fixed at the center of the first ring. The center of the vibration plate 1802 may include a converging center and a groove 1820 suitable for the three first rings 1813. The vibration board 1802 may be configured to have a second ring 1821 and three second rods 1822. The radius of the second ring 1821 may be different from the radius of the vibration conducting plate 1801. The thickness of the second rod 1822 may be different from the thickness of the first rod 1814. The first rod 1814 and the second rod 1822 are not particularly limited, but may be assembled so as to intersect at an intersection angle of 60 degrees.

  The first rod and the second rod may be linear rods or may have other shapes that satisfy specific requirements. There may also be more than two rods arranged symmetrically or asymmetrically to meet economic or practical requirements. The vibration conducting plate 1801 may be thin and have elasticity. The vibration conducting plate 1801 may be disposed at the center of the groove 1820 of the vibration board 1802. A voice coil 1808 may be configured under the second ring 1821 coupled to the vibration board 1802. The composite vibration unit may further include a substrate 1812 on which an annular magnet 1810 is formed. The inner magnet 1811 may be configured concentrically within the range of the annular magnet 1810. The inner magnetic flux conducting plate may be configured on the top surface of the inner magnet 1811. Further, the annular magnetic flux conducting plate 1807 may be configured in the annular magnet 1810. The gasket 1806 may be fixed on the annular magnetic flux conducting plate 1807, and the first ring 1813 of the vibration conducting plate 1801 may be connected to the gasket 1806. The entire composite vibration unit may be connected to an external component or a user via the panel 1830. The composite vibration device may be in contact with an external component through the panel 1830. The panel 1830 may be fixed at the convergence center, or may be clamped at the center of the vibration conductive plate 1801 and the vibration board 1802. Good.

  As shown in FIG. 19, the composite vibration unit including the vibration board and the vibration conductive plate may generate two resonance peaks by superimposing vibrations from two vibration sources. The resonance peak can be shifted by adjusting the size, material, or other parameters of the two components. The resonance peak in the low frequency can be shifted toward a lower frequency. In addition, the resonance peak having a high frequency can be shifted toward a higher frequency. Preferably, the rigidity of the vibration board may be larger than the rigidity of the vibration conductive plate. Under ideal conditions, it is possible to obtain a smooth frequency response as shown by the point curve in FIG.

  These resonance peaks may be set in a frequency range that can be heard by the human ear, or may be set in a frequency range that cannot be heard by the human ear. Preferably, the two resonance peaks may be outside the frequency range that humans can hear. More preferably, one resonance peak may be in a frequency range that can be heard by a human ear, and the other resonance peak may be outside a frequency range that a human can hear. More preferably, the two resonance peaks may be in a frequency range that can be heard by the human ear. More preferably, the two resonance peaks may be in a frequency range that can be heard by the human ear, and the peak frequency may be in the range of 80 Hz to 18000 Hz. More preferably, the two resonance peaks may be in a frequency range that can be heard by the human ear, and the peak frequency may be in the range of 200 Hz to 15000 Hz. More preferably, the two resonance peaks may be in a frequency range that can be heard by the human ear, and the peak frequency may be in the range of 500 Hz to 12000 Hz. More preferably, the two resonance peaks may be in a frequency range that can be heard by the human ear, and the peak frequency may be in the range of 800 Hz to 11000 Hz.

  There may be an interval between the values of the resonance peak frequencies. For example, the interval between the frequency values of the two resonance peaks may be 500 Hz, preferably 1000 Hz, more preferably 2000 Hz, and more preferably 5000 Hz.

  In order to achieve a better effect, the two resonance peaks may be in a frequency range that can be heard by the human ear. The difference between the peak values of the two resonance peaks may be at least 500 Hz. Preferably, the two resonance peaks may be in a frequency range that can be heard by the human ear, and the interval between the frequency values of the two resonance peaks may be at least 1000 Hz. More preferably, the two resonance peaks may be in a frequency range that can be heard by the human ear, and the interval between the frequency values of the two resonance peaks may be at least 2000 Hz. More preferably, the two resonance peaks may be in a frequency range that can be heard by the human ear, and the interval between the two resonance peak frequency values may be at least 3000 Hz. And more preferably, the two resonance peaks may be in a frequency range that can be heard by the human ear, and the interval between the frequency values of the two resonance peaks may be at least 4000 Hz.

  One resonance peak may be within a frequency range that can be heard by a human ear, and the other resonance peak may be outside a frequency range that can be heard by a human, and may be at the frequency of two resonance peaks. The value interval may be at least 500 Hz. Preferably, one resonance peak may be in a frequency range that can be heard by a human ear, and the other resonance peak may be outside a frequency range that a human can hear, and two resonance peaks. The frequency value interval may be at least 1000 Hz. More preferably, one resonance peak may be in a frequency range that can be heard by a human ear, and the other resonance peak may be outside a frequency range that can be heard by a human ear. The interval between the peak frequency values may be at least 2000 Hz. More preferably, one resonance peak may be in a frequency range that can be heard by a human ear, and the other resonance peak may be outside a frequency range that can be heard by a human ear. The interval between the peak frequency values may be at least 3000 Hz. More preferably, one resonance peak may be in a frequency range that can be heard by a human ear, and the other resonance peak may be outside a frequency range that can be heard by a human ear. The interval between the peak frequency values may be at least 4000 Hz.

  The two resonance peaks may both be in the frequency range of 5 Hz to 30000 Hz, and the interval between the two resonance peak frequency values may be at least 400 Hz. Preferably, both of the two resonance peaks may be in a frequency range of 5 Hz to 30000 Hz, and the interval between the frequency values of the two resonance peaks may be at least 1000 Hz. More preferably, the two resonance peaks may both be in the frequency range of 5 Hz to 30000 Hz, and the interval between the frequency values of the two resonance peaks may be at least 2000 Hz. More preferably, the two resonance peaks may both be in the frequency range of 5 Hz to 30000 Hz, and the interval between the frequency values of the two resonance peaks may be at least 3000 Hz. More preferably, both of the two resonance peaks may be in a frequency range of 5 Hz to 30000 Hz, and an interval between the frequency values of the two resonance peaks may be at least 4000 Hz.

  The two resonance peaks may both be in the frequency range of 20 Hz to 20000 Hz, and the interval between the frequency values of the two resonance peaks may be at least 400 Hz. Preferably, both of the two resonance peaks may be in a frequency range of 20 Hz to 20000 Hz, and the interval between the frequency values of the two resonance peaks may be at least 1000 Hz. More preferably, the two resonance peaks may both be in the frequency range of 20 Hz to 20000 Hz, and the interval between the frequency values of the two resonance peaks may be at least 2000 Hz. More preferably, the two resonance peaks may both be in the frequency range of 20 Hz to 20000 Hz, and the interval between the frequency values of the two resonance peaks may be at least 3000 Hz. More preferably, both of the two resonance peaks may be in a frequency range of 20 Hz to 20000 Hz, and an interval between the frequency values of the two resonance peaks may be at least 4000 Hz.

  The two resonance peaks may both be in the frequency range of 100 Hz to 18000 Hz, and the interval between the two resonance peak frequency values may be at least 400 Hz. Preferably, the two resonance peaks may both be in the frequency range of 100 Hz to 18000 Hz, and the interval between the two resonance peak frequency values may be at least 1000 Hz. More preferably, the two resonance peaks may both be in the frequency range of 100 Hz to 18000 Hz, and the interval between the two resonance peak frequency values may be at least 2000 Hz. More preferably, the two resonance peaks may both be in the frequency range of 100 Hz to 18000 Hz, and the interval between the two resonance peak frequency values may be at least 3000 Hz. And more preferably, the two resonance peaks may both be in the frequency range of 100 Hz to 18000 Hz, and the interval between the frequency values of the two resonance peaks may be at least 4000 Hz.

  The two resonance peaks may both be in the frequency range of 200 Hz to 12000 Hz, and the interval between the two resonance peak frequency values may be at least 400 Hz. Preferably, both of the two resonance peaks may be in a frequency range of 200 Hz to 12000 Hz, and the interval between the frequency values of the two resonance peaks may be at least 1000 Hz. More preferably, the two resonance peaks may both be in the frequency range of 200 Hz to 12000 Hz, and the interval between the two resonance peak frequency values may be at least 2000 Hz. More preferably, the two resonance peaks may both be in the frequency range of 200 Hz to 12000 Hz, and the interval between the frequency values of the two resonance peaks may be at least 3000 Hz. And more preferably, the two resonance peaks may both be in the frequency range of 200 Hz to 12000 Hz, and the interval between the frequency values of the two resonance peaks may be at least 4000 Hz.

  The two resonance peaks may both be in the frequency range of 500 Hz to 10000 Hz, and the interval between the two resonance peak frequency values may be at least 400 Hz. Preferably, the two resonance peaks may both be in the frequency range of 500 Hz to 10000 Hz, and the interval between the frequency values of the two resonance peaks may be at least 1000 Hz. More preferably, the two resonance peaks may both be in the frequency range of 500 Hz to 10000 Hz, and the interval between the frequency values of the two resonance peaks may be at least 2000 Hz. More preferably, the two resonance peaks may both be in a frequency range of 500 Hz to 10000 Hz, and the interval between the frequency values of the two resonance peaks may be at least 3000 Hz. And more preferably, both of the two resonance peaks may be in a frequency range of 500 Hz to 10000 Hz, and the interval between the frequency values of the two resonance peaks may be at least 4000 Hz. Thereby, the range of the resonance response of the speaker may be expanded, and as a result, a more ideal sound quality can be obtained.

  In actual use, there may be multiple vibration conducting plates and vibration boards to form a multi-layer vibration structure corresponding to different ranges of frequency response, so that the loudspeaker is full-scale, the entire range Note that high quality vibrations can be obtained, and the frequency response curve may be adapted to meet the requirements in a particular frequency range.

  For example, to meet normal hearing requirements, a bone conduction hearing aid may be configured to have a transducer with one or more vibration boards and vibration conduction plates having a resonant frequency in the range of 100 Hz to 10000 Hz. Good. A description of a composite vibration unit comprising a vibration board and a vibration conductive plate can be found in Chinese Patent Application No. 20110148083.9 filed on December 23, 2011 (Title: “Bone Conduction Speaker and Composite Vibration Unit”). be able to. The contents are incorporated herein by reference.

  As shown in FIG. 20, in another embodiment, the vibration system may include a vibration board 2002, a first vibration conduction plate 2003, and a second vibration conduction plate 2001. The first vibration conduction plate 2003 may fix the vibration board 2002 and the second vibration conduction plate 2001 on the housing 2019. A composite vibration system comprising a vibration board 2002, a first vibration conducting plate 2003, and a second vibration conducting plate 2001 can produce two or more resonance peaks and a smoother frequency response curve within the auditory system. Can do. As a result, the sound quality of the bone conduction speaker can be improved. An equivalent model of the vibration system is shown in FIG.

  Reference numeral 2101 denotes a housing, 2102 denotes a panel, 2103 denotes a voice coil, 2104 denotes magnetic circuit vibration, 2105 denotes a first vibration conduction plate, 2106 denotes a second vibration conduction plate, 2107 Is a vibration board. The first vibration transmission plate, the second vibration transmission plate, and the vibration board may be extracted as structural members having elasticity and damping properties. The housing, the panel, the voice coil, and the magnetic circulation system may be extracted as an equivalent mass block. The vibration equation of the system is expressed as follows.

Where F is the driving force, k ₆ is the equivalent stiffness coefficient of the second vibration conducting plate, k ₇ is the equivalent stiffness coefficient of the vibrating board, and k ₈ is the equivalent stiffness of the first vibration conducting plate. R ₆ is the equivalent damping of the second vibrating plate, R ₇ is the equivalent damping of the vibrating board, R ₈ is the equivalent damping of the first vibrating plate, and m ₅ is the panel's equivalent damping. is the mass, m ₆ is the mass of magnetic circulation system, m ₇ is the mass of the voice coil, x ₅ is the panel of the displacement, x ₆ is the displacement of the magnetic circulation system, x ₇ is the voice coil Displacement. The amplitude of the panel 2102 can be expressed as follows.

In the equation, ω is an angular frequency of vibration, and f ₀ is a unit driving force.

The vibration system of the bone conduction speaker can transmit vibration to the user through the panel. According to equation (15), the vibration efficiency may be related to the vibration board, the stiffness coefficient of the first vibration conduction plate and the second vibration conduction plate, and vibration damping. Preferably, the stiffness coefficient k ₇ of the vibration board may be greater than the stiffness coefficient k _{6 of} the second vibration conduction plate, and the stiffness coefficient k ₇ of the vibration board is greater than the stiffness coefficient k ₈ of the first vibration conduction plate. May be larger. The number of resonance peaks produced by the composite vibration system having the first vibration conducting plate may be greater than the number of resonance peaks produced by the composite vibration system not having the first vibration conducting plate, There is preferably a resonance peak. More preferably, the at least one resonance peak may be outside the range that can be heard by the human ear. More preferably, the two resonance peaks may be in a range that can be heard by the human ear. Even more preferably, the resonance peak may be within a range that can be heard by the human ear, and the peak value of the frequency may be 18000 Hz or less. More preferably, the resonance peak may be within a range that can be heard by the human ear, and the peak value of the frequency may be 100 Hz to 15000 Hz or less. More preferably, the resonance peak may be within a range that can be heard by the human ear, and the peak value of the frequency may be 200 Hz to 12000 Hz or less. More preferably, the resonance peak may be within a range that can be heard by the human ear, and the peak value of the frequency may be 500 Hz to 11000 Hz or less.

  There may be an interval between the values of the resonance peak frequencies. For example, there may be two or more resonance peaks in which the interval between the frequency values of the two resonance peaks exceeds 200 Hz. Preferably, there may be two or more resonance peaks in which the interval between the frequency values of the two resonance peaks exceeds 500 Hz. More preferably, there may be two or more resonance peaks in which the interval between the frequency values of the two resonance peaks exceeds 1000 Hz. More preferably, there may be two or more resonance peaks in which the interval between the frequency values of the two resonance peaks exceeds 2000 Hz. More preferably, there may be two or more resonance peaks in which the interval between the frequency values of the two resonance peaks exceeds 5000 Hz.

  In order to achieve a better effect, the resonance peaks may all be within the range that can be heard by humans, even if there are two or more resonance peaks with a frequency value of 500 Hz or more between the two resonance peaks. Good. Preferably, all of the resonance peaks may be within a range that can be heard by humans, and there may be two or more resonance peaks in which the interval between the frequency values of the two resonance peaks is 1000 Hz or more. More preferably, all the resonance peaks may be within a range that can be heard by humans, and there may be two or more resonance peaks in which the interval between the frequency values of the two resonance peaks is 2000 Hz or more. More preferably, all of the resonance peaks may be within a range that can be heard by humans, and there may be two or more resonance peaks in which the interval between the frequency values of the two resonance peaks is 3000 Hz or more. More preferably, all of the resonance peaks may be within a range that can be heard by humans, and there may be two or more resonance peaks in which the interval between the frequency values of the two resonance peaks is 4000 Hz or more.

  Of the three resonance peaks, two may be within the frequency range that can be heard by the human ear, and the other resonance peak may be outside the frequency range that can be heard by the human ear. There may be at least two resonance peaks with a frequency value interval between the peaks of 500 Hz or more. Preferably, of the three resonance peaks, two may be in a frequency range that can be heard by a human ear, and the other resonance peak may be outside a frequency range that a human can hear, There may be at least two resonance peaks whose frequency value interval between the two resonance peaks is 1000 Hz or more. More preferably, of the three resonance peaks, two may be in a frequency range that can be heard by the human ear, and the other resonance peak is outside the frequency range that can be heard by the human ear. There may be at least two resonance peaks whose frequency value interval between the two resonance peaks is 2000 Hz or more. More preferably, of the three resonance peaks, two may be in a frequency range that can be heard by the human ear, and another resonance peak may be outside the frequency range that can be heard by the human ear. There may be at least two resonance peaks whose frequency value interval between the two resonance peaks is 3000 Hz or more. More preferably, of the three resonance peaks, two may be in a frequency range that can be heard by the human ear, and another resonance peak may be outside the frequency range that can be heard by the human ear. There may be at least two resonance peaks whose frequency value interval between the two resonance peaks is 4000 Hz or more.

  Of the three resonance peaks, one may be within the frequency range that can be heard by the human ear, and the remaining two resonance peaks may be outside the frequency range that the human can hear. There may be at least two resonance peaks in which the frequency value interval between the resonance peaks is 500 Hz or more. Preferably, of the three resonance peaks, one may be in a frequency range that can be heard by the human ear, and the remaining two resonance peaks may be outside the frequency range that can be heard by a human. There may be at least two resonance peaks in which the frequency value interval between the two resonance peaks is 1000 Hz or more. More preferably, one of the three resonance peaks may be in a frequency range that can be heard by a human ear, and the remaining two resonance peaks may be outside the frequency range that a human can hear. There may be at least two resonance peaks whose frequency value interval between the two resonance peaks is 2000 Hz or more. More preferably, one of the three resonance peaks may be in a frequency range that can be heard by a human ear, and the remaining two resonance peaks may be outside the frequency range that a human can hear. There may be at least two resonance peaks in which the frequency value interval between the two resonance peaks is 3000 Hz or more. More preferably, one of the three resonance peaks may be in a frequency range that can be heard by a human ear, and the remaining two resonance peaks may be outside the frequency range that a human can hear. There may be at least two resonance peaks in which the frequency value interval between the two resonance peaks is 4000 Hz or more.

  The resonance peaks may all be in the frequency range of 5 Hz to 30000 Hz, and there may be at least two resonance peaks with a frequency value interval between the two resonance peaks of at least 400 Hz. Preferably, all of the resonance peaks may be in a frequency range of 5 Hz to 30000 Hz, and there may be at least two resonance peaks whose frequency value interval between the two resonance peaks is at least 1000 Hz. More preferably, the resonance peaks may all be in the frequency range of 5 Hz to 30000 Hz, and there may be at least two resonance peaks with a frequency value interval between the two resonance peaks of at least 2000 Hz. More preferably, the resonance peaks may all be in the frequency range of 5 Hz to 30000 Hz, and there may be at least two resonance peaks with a frequency value interval between the two resonance peaks of at least 3000 Hz. More preferably, all of the resonance peaks may be in a frequency range of 5 Hz to 30000 Hz, and there may be at least two resonance peaks whose frequency value interval between the two resonance peaks is at least 4000 Hz.

  All of the resonance peaks may be in the frequency range of 20 Hz to 20000 Hz, and there may be at least two resonance peaks whose frequency value interval between the two resonance peaks is at least 400 Hz. Preferably, all of the resonance peaks may be in a frequency range of 20 Hz to 20000 Hz, and there may be at least two resonance peaks whose frequency value interval between the two resonance peaks is at least 1000 Hz. More preferably, the resonance peaks may all be in the frequency range of 20 Hz to 20000 Hz, and there may be at least two resonance peaks whose frequency value interval between the two resonance peaks is at least 2000 Hz. More preferably, the resonance peaks may all be in the frequency range of 20 Hz to 20000 Hz, and there may be at least two resonance peaks with a frequency value interval between the two resonance peaks of at least 3000 Hz. More preferably, all the resonance peaks may be in a frequency range of 20 Hz to 20000 Hz, and there may be at least two resonance peaks whose frequency value interval between the two resonance peaks is at least 4000 Hz.

  All of the resonance peaks may be in the frequency range of 100 Hz to 18000 Hz, and there may be at least two resonance peaks whose frequency value interval between the two resonance peaks is at least 400 Hz. Preferably, all of the resonance peaks may be in a frequency range of 100 Hz to 18000 Hz, and there may be at least two resonance peaks whose frequency value interval between the two resonance peaks is at least 1000 Hz. More preferably, the resonance peaks may all be in the frequency range of 100 Hz to 18000 Hz, and there may be at least two resonance peaks with a frequency value interval between the two resonance peaks of at least 2000 Hz. More preferably, the resonance peaks may all be in a frequency range of 100 Hz to 18000 Hz, and there may be at least two resonance peaks whose frequency value interval between the two resonance peaks is at least 3000 Hz. More preferably, all of the resonance peaks may be in a frequency range of 100 Hz to 18000 Hz, and there may be at least two resonance peaks having a frequency value interval between the two resonance peaks of at least 4000 Hz.

  All of the resonance peaks may be in the frequency range of 200 Hz to 12000 Hz, and there may be at least two resonance peaks whose frequency value interval between the two resonance peaks is at least 400 Hz. Preferably, all of the resonance peaks may be in a frequency range of 200 Hz to 12000 Hz, and there may be at least two resonance peaks whose frequency value interval between the two resonance peaks is at least 1000 Hz. More preferably, all of the resonance peaks may be in the frequency range of 200 Hz to 12000 Hz, and there may be at least two resonance peaks whose frequency value interval between the two resonance peaks is at least 2000 Hz. More preferably, all of the resonance peaks may be in the frequency range of 200 Hz to 12000 Hz, and there may be at least two resonance peaks whose frequency value interval between the two resonance peaks is at least 3000 Hz. More preferably, all of the resonance peaks may be within a frequency range of 200 Hz to 12000 Hz, and there may be at least two resonance peaks whose frequency value interval between the two resonance peaks is at least 4000 Hz.

  The resonance peaks may all be in the frequency range of 500 Hz to 10000 Hz, and there may be at least two resonance peaks with a frequency value interval between the two resonance peaks of at least 400 Hz. Preferably, all of the resonance peaks may be in the frequency range of 500 Hz to 10000 Hz, and there may be at least two resonance peaks with a frequency value interval between the two resonance peaks of at least 1000 Hz. More preferably, the resonance peaks may all be in the frequency range of 500 Hz to 10000 Hz, and there may be at least two resonance peaks whose frequency value interval between the two resonance peaks is at least 2000 Hz. More preferably, the resonance peaks may all be in the frequency range of 500 Hz to 10000 Hz, and there may be at least two resonance peaks whose frequency value interval between the two resonance peaks is at least 3000 Hz. More preferably, all the resonance peaks may be in a frequency range of 500 Hz to 10000 Hz, and there may be at least two resonance peaks whose frequency value interval between the two resonance peaks is at least 4000 Hz.

  In some embodiments, a composite vibration system that includes a vibration board, a first vibration conducting plate, and a second vibration conducting plate may result in a frequency response as shown in FIG. 21-B. A composite vibration system having a first vibration conducting plate may result in three distinct resonance peaks. Thereby, the sensitivity of the frequency response in the low frequency range (about 600 Hz) may be improved, a smoother frequency response may be obtained, and the sound quality may be improved.

  The resonance peak can be shifted by changing the parameters (for example, size and material) of the first vibration conducting plate, and finally an ideal frequency response can be obtained. As shown in FIG. 21-C, when the stiffness coefficient (stiffness coefficient) of the first vibration conducting plate is gradually decreased (that is, as the first vibration conducting plate is changed from a hard one to a soft one), the resonance peak is increased. Shifting in the low frequency direction greatly improves the sensitivity of the bone conduction speaker in the low frequency band. Preferably, the first vibration conducting plate may be an elastic plate, and the elasticity may be determined based on the material, thickness, structure, and the like. Although not particularly limited, examples of the material of the first vibration conductive plate include steel materials (not particularly limited, such as stainless steel and carbon steel), light alloys (not particularly limited, such as aluminum, beryllium copper, magnesium alloy, titanium). Alloy, etc.) and plastics (including but not limited to polyethylene, blow molded nylon, plastics, etc.). The material may be a single material or a composite of materials that achieve the same performance. Although not particularly limited, the composite material includes reinforcing materials such as glass fiber, carbon fiber, boron fiber, graphite fiber, graphene fiber, silicon carbide fiber, and aramid fiber. The composite material may be other organic and / or inorganic composite materials such as various types of glass fibers reinforced with unsaturated polyesters and epoxies, glass fibers containing a phenolic resin matrix.

  The thickness of the first vibration conducting plate may be 0.005 mm or more. Preferably, the thickness may be 0.005 mm to 3 mm. More preferably, the thickness may be 0.01 mm to 2 mm. More preferably, the thickness may be 0.01 mm to 1 mm. More preferably, the thickness may be 0.02 mm to 0.5 mm. The first vibration transmitting plate may have an annular structure, and preferably includes at least one, preferably at least two annular rings. The annular ring may be a concentric ring or a non-concentric ring, which may be connected to each other via at least two rods that converge from the outer ring toward the center of the inner ring. . More preferably, there may be at least one oval ring. More preferably, there may be at least two oval rings. The oval rings may have different radii of curvature, and the oval rings may be connected to each other via a rod. More preferably, there may be at least one angular ring.

  The first vibration transmission plate may be plate-shaped. Preferably, a hollow pattern may be configured on the plate. More preferably, the area of the hollow pattern may be equal to or greater than the area of the non-hollow part. It should be noted that the above-described vibration-transmitting plate material, structure, and thickness can be combined in any manner, and another vibration-transmitting plate can be newly obtained. For example, the annular vibration transmitting plate may have different film thickness distributions. Preferably, the thickness of the ring may be equal to the thickness of the rod. More preferably, the thickness of the rod may be greater than the thickness of the ring. Even more preferably, the thickness of the inner ring may be greater than the thickness of the outer ring.

Example 1
The bone conduction speaker may include a U-shaped headset bracket / headset lanyard, two vibration units, and a transducer connected to each vibration unit. The vibration unit may include a contact surface and a housing. The contact surface may be on the outer surface of the silica gel transmission layer, and may be configured to have a gradient structure including a convex portion. The clamping force between the headset bracket / headset lanyard and the skin may be unevenly distributed on the contact surface. The sound transmission efficiency of the portion having the gradient structure may be different from the portion having no gradient structure.

(Example 2)
This embodiment may differ from the first embodiment in the following points. The headset bracket / headset lanyard described above may include a memory material. The headset bracket / headset lanyard may be adapted to the curve of the head for each user, thereby providing better resilience and better fit. The headset bracket / headset lanyard may be able to recover to its original shape from a state of deformation that lasts for a certain period of time. In the present application, the specific period may refer to 10 minutes, 30 minutes, 1 hour, 2 hours, 5 hours, or 1 day, 2 days, 10 days, 1 month, 1 year, or more. It may refer to a long period. It may be maintained in a stable state by the tightening force provided by the headset bracket / headset lanyard, and may not gradually fall over time. The pressure intensity between the bone conduction speaker and the user's body surface is within an appropriate range and may be such that the user does not experience pain due to excessive pressure when wearing the bone conduction speaker. . The tightening force of the bone conduction speaker may be within a range of 0.2N to 1.5N when the bone conduction speaker is used.

Example 3
Differences between this embodiment and the above two embodiments may include the following points. The elastic modulus of the headset bracket / headset lanyard may be kept in a specific range. As a result, the value of the frequency response curve at low frequencies (eg, less than 500 Hz) may be higher than the value of the frequency response curve at high frequencies (eg, greater than 4000 Hz).

(Example 4)
Differences between the fourth embodiment and the first embodiment may include the following points. The bone conduction speaker may be coupled to a frame of glasses or to a helmet or mask having a special function.

(Example 5)
Differences between this embodiment and the first embodiment may include the following points. The vibration unit may include two or more panels, and the vibration transmitting plate between the different panels may be provided with different gradient structures on the contact surface that contacts the user. For example, one contact surface may have a convex portion, and the other may have a concave portion. Also, the gradient structures on both two contact surfaces may be convex or concave structures. However, there may be a difference in at least one of the shape and number of convex portions.

(Example 6)
The portable bone conduction hearing aid may include multiple frequency response curves. The user or tester can select an appropriate response curve to perform hearing compensation according to the actual response curve of the human auditory system. In addition, depending on actual requirements, the vibration unit of the bone conduction hearing aid may allow the bone conduction hearing aid to generate an ideal frequency response in a specific frequency range (eg, 500 Hz-4000 Hz).

(Example 7)
The vibration generating unit of the bone conduction speaker may be as shown in FIG. 22-A. The transducer of the bone conduction speaker includes a magnetic circulation system including a magnetic flux transmission plate 2210, a magnet 2211 and an exciter 2212, a vibration board 2214, a coil 2215, a first vibration transmission plate 2216, and a second vibration transmission plate. 2217 may be included. The panel 2213 may protrude from the housing 2219 and may be coupled to the vibration board 2214 using an adhesive. The transducer may be fixed to the housing 2219 via the first vibration transmitting plate 2216 that forms a suspended structure.

  A composite vibration system including a vibration board 2214, a first vibration transfer plate 2216, and a second vibration transfer plate 2217 may improve the sound quality of a bone conduction speaker by generating a smoother frequency response curve. It may be. The transducer is fixed to the housing 2219 via the first vibration transmitting plate 2216, thereby reducing the vibration transmitted by the transducer to the housing 2219 and effectively reducing sound leakage caused by the vibration of the housing. The effect of housing vibration on sound quality may be reduced. FIG. 22-B shows a frequency response curve of the vibration intensity of the vibration generating unit housing and the panel having the frequency. The thick line indicates the frequency response of the vibration generating unit including the first vibration transmitting plate 2216. A thin line indicates a frequency response of a vibration generating unit without the first vibration transmitting plate 2216. As shown in FIG. 22-B, when the frequency is higher than 500 Hz, the vibration strength of the bone conduction speaker housing without the first vibration transmission plate is equal to that of the bone conduction speaker housing having the first vibration transmission plate. It may be greater than the vibration intensity. FIG. 22-C shows a comparison of sound leakage between the situation where the bone conduction speaker includes the first vibration transmissive plate 2216 and the situation where the bone conduction speaker does not include the first vibration transmissive plate 2216. Show. In an intermediate frequency range (eg, about 1000 Hz), sound leakage when the conduction speaker includes the first vibration-transmitting plate 2216 is a sound leakage when the bone-conduction speaker does not include the first vibration-transmitting plate 2216. It may be smaller than the leak. It can be concluded that the use of the first vibration transmitting plate between the panel and the housing can effectively reduce the vibration of the housing and thereby reduce the sound leakage.

  The first vibration transmitting plate is not particularly limited, for example, but may be made of stainless steel, copper, plastic, polycarbonate, or the like, and may have a thickness in the range of 0.01 mm to 1 mm.

(Example 8)
This embodiment may differ from embodiment 7 in the following respects. As shown in FIG. 23, the panel 2313 may be configured to have a vibration transmitting layer 2320 (but not limited to, for example, silica gel), which causes a specific deformation and is fixed on the user's skin. You may make it do. The contact portion that is in contact with the panel 2313 on the vibration transmission layer 2320 may be higher than the portion that is not in contact with the panel 2313 on the vibration transmission layer, and thus a step structure may be formed. A portion of the vibration transmission layer 2320 that is not in contact with the panel 2313 may be configured to have one or more holes 2321. Sound leakage may be reduced by a hole on the vibration transmission layer. The connection between the panel 2313 and the housing 2319 via the vibration transmission layer 2320 may be weakened, reducing the vibration transmitted from the panel 2313 to the housing 2319 via the transmission layer 2320, thereby causing the sound caused by the vibration of the housing. Leakage may be reduced. Air leakage and sound leakage caused by vibration of air may be reduced by reducing the area of the vibration transmitting layer 2320 configured to have a hole on a portion that does not have a protrusion. The vibration of the air in the housing can be led out and the vibration of the air caused by the housing 2319 may be counteracted, thereby reducing sound leakage.

Example 9
Differences between this embodiment and the seventh embodiment may include the following points. As the panel protrudes from the housing, the housing and the panel may be coupled via the first vibration transmitting plate. The degree of coupling between the panel and the housing can be drastically reduced. Also, as the first vibration transmissible plate causes a certain amount of deformation, the panel can contact the user with a greater degree of freedom (as shown in the right diagram of FIG. 24-A). The first vibration conducting plate may be inclined at a certain angle with respect to the housing. The slope angle preferably does not exceed 5 degrees.

  The vibration efficiency may vary depending on the contact situation. As a result of the better contact situation, the vibration transmission efficiency may be higher as a result. As shown in FIG. 24B, the thick line indicates the vibration transmission efficiency in a better contact situation, and the thin line indicates the worse contact situation. It can be concluded that better contact conditions can result in higher vibration transmission efficiency.

(Example 10)
Differences between this embodiment and the seventh embodiment may include the following points. An extension may be added around the housing. When the housing comes into contact with the user's skin, the distribution of the force applied by the surrounding extension is made uniform, and the user's wearing feeling can be improved. As shown in FIG. 25, there may be a height difference d ₀ between the surrounding expanded portion 2510 and the panel 2513. The force d from the skin to the panel 2513 can reduce the distance d between the panel 2513 and the surrounding extension 2510. When the force between the bone conduction speaker and the user is larger than the force related to the first vibration conduction plate having the deformation degree d0, the surplus force is not affected by the tightening force of the vibration part, and the surrounding extension part 2510. It may be transmitted to the user's skin via. Moreover, harmony of the tightening force may be improved, thereby ensuring sound quality.

(Example 11)
The shape of the panel may be as shown in FIG. The connector 2620 between the panel 2610 and the transducer (not shown in FIG. 26) may be illustrated by a dotted line. The transducer may transmit vibration to the panel 2610 via the connector 2620. Further, the connector 2620 may be located at the vibration center of the panel 2610. The distance between the center O of the connector 2620 and the two surfaces of the panel 2610 may be L1 and L2, respectively. By changing the size of the panel 2610 and the position of the connector 2626 on the panel 2610, the contact characteristics between the panel and the user's skin, and the vibration transmission efficiency can be changed. The ratio of L1 to L2 is preferably greater than 1. More preferably, the ratio of L1 to L2 is greater than 1.61. More preferably, the ratio of L1 to L2 is greater than 2. As another example, a large panel, a middle panel, or a small panel may be configured in the vibration unit. The large panel used in the present application may be a panel as shown in FIG. The area may be larger than the area of the connector 2620. The area of the middle panel may be smaller than the area of the connector 2620. The area of the small panel may be smaller than the area of the connector 2620. By changing the size of the panel and changing the position of the connector 2620, the distribution of vibration on the surface of the wearer can be changed, and the volume and sound quality can be changed.

(Example 12)
This embodiment may relate to a plurality of configurations of the gradient structure outside the contact surface. As shown in FIG. 27, the gradient structure may include a different number of protrusions at different positions outside the contact surface. In Scheme 1, there may be one convex portion close to one end portion of the contact surface. In scheme 2, there may be a convex portion close to the center of the contact surface. In Scheme 3, there may be two protrusions close to both ends of the contact surface. In Scheme 4, there may be three convex portions. In scheme 5, there may be four convex portions. The number and position of the convex portions may affect the vibration transmission effect. As shown in FIG. 28-A and FIG. 28-B, the frequency response curve of the contact surface without the convex portion may be different from the frequency response curve in Scheme 1-5 having the convex portion. After the addition of the gradient structure (convex part), the frequency response curve in the range of 300 Hz to 1100 Hz has clearly risen, which clearly improves the sound at low to intermediate frequencies after the addition of the gradient structure. It can be concluded that it has been shown.

(Example 13)
This embodiment may relate to a plurality of configurations for the gradient structure inside the contact surface. As shown in FIG. 29, the gradient structure may be located inside the contact surface on the rear side of the user. In Scheme A, the inside of the vibration transmission layer may be in contact with the panel, and the contact surface may have a specific inclination angle with respect to the outside of the vibration transmission layer. In Scheme B, the inside of the vibration transmission layer may be configured to have a step structure located at the end of the vibration transmission layer. In scheme C, the inside of the vibration transmission layer may be configured to have another step structure located at the center of the vibration transmission layer. In Scheme D, the inside of the vibration transmission layer may be configured to have a plurality of step structures. The gradient structure inside the vibration transfer layer may allow different vibration transfer efficiencies for different positions of the panel and the contact surface, thereby broadening the frequency response curve and the frequency response in a specific range May be made smoother, thereby improving sound quality.

(Example 14)
The difference between this embodiment and the eighth embodiment is that, as shown in FIG. 30, a sound guide hole is formed in the vibration transmission layer 3020 and the housing 3019, and the inside of the housing formed by the vibration of the air in the housing. It is to guide the sound wave to the sound guide hole. Outside the housing, the leaked sound waves formed by the vibration of the air by the housing 3019 cancel each other and sound leakage is reduced.

  The above-described embodiments are merely examples of the present disclosure, and the description is specific and detailed, but these descriptions do not limit the present disclosure. A person skilled in the art can make various changes and modifications to the approach for sound transmission described in the present application, for example, without departing from the basic principle of the bone conduction speaker. Note that modifications and variations still fall within the scope of this disclosure.

210 Housing 311 Housing 220 Panel 230 Transducer 240 Connector 250 Connection 301 Fixed end 321 Panel 331 Elastomer 332 Attenuating element 341 Elastomer 401 Speaker 402 Skin 403 Subcutaneous tissue 404 Bone 405 Cochlea 501 Panel 5020 Adhesive 502a Contact surface 503 Vibration transmitting layer 504 Housing 630 Panel 640 Vibration transmission layer 650 Adhesive 920 Housing 930 Panel 940 Vibration transmission layer 950 Adhesive 960 Sound guide hole 1101 Fixed end 1102 Sensor terminal 1103 Vibration unit 11043 Transducer 1201 Headset lanyard 1202 Vibration unit 1202b Housing 1203 Transducer 1202a Contact surface 1204 Position 1501 Elastic bandage 160 1 Contact surface 1801 Vibration conduction plate 1802 Vibration board 1802 Vibration plate 1820 Groove 1830 Panel 1806 Gasket 1807 Magnetic flux conduction plate 1808 Voice coil 1810, 2211 Magnet 1811 Inner magnet 1812 Substrate 1813 First ring 1814 First rod 1814 First rod 1821 First 2 ring 1822 second rod 2001 second vibration conduction plate 2002 vibration board 2003 first vibration conduction plate 2102 panel 2210 magnetic flux transmission plate 2212 exciter 2213 panel 2214 vibration board 2215 coil 2216 first vibration transmission plate 2217 Second vibration transmission plate 2019 Housing 2219 Housing 2313 Panel 2319 Housing 2320 Vibration transmission layer 2321 Hole 2510 Expansion 2513,2610 Panel 2620,2626 connector 3019 housing 3020 vibration transmission layer

Claims (22)

Including a step of preparing a bone conduction speaker, wherein the bone conduction speaker includes a vibration unit;
The vibration unit includes at least a contact surface,
The contact surface is in direct or indirect contact with the user at least partially;
The contact surface has a gradient structure such that pressure is unevenly distributed on the contact surface.
How to improve the sound quality of bone conduction speakers. Due to the pressure distribution at the contact surface, a different frequency response curve is produced for each contact point of the contact surface
The method of claim 1. The frequency response curve of the contact surface is a superposition of frequency curves at each point on the contact surface.
The method of claim 2. The gradient structure includes at least one protrusion;
The method of claim 1. The gradient structure includes at least one recess;
The method of claim 1. The gradient structure is located at the center or end of the contact surface;
The method of claim 1. The gradient structure is installed on one side of the contact surface opposite the user;
The method of claim 1. The gradient structure includes at least one protrusion;
The method of claim 7. The gradient structure includes at least one recess;
The method of claim 7. The gradient structure is located at the center or end of the side of the contact surface;
The method of claim 7. The value of the pressure on the contact surface is between a first threshold value and a second threshold value, the first threshold value being a minimum force to achieve a high transmission efficiency of high frequency vibrations; The second threshold is the maximum force to achieve high transmission efficiency of low frequency vibrations.
The method of claim 1. The first threshold is 0.2N and the second threshold is 1.5N;
The method of claim 11. With a vibration unit,
The vibration unit includes at least a contact surface,
The contact surface is in direct or indirect contact with the user at least partially;
The contact surface has a gradient structure in which pressure is unevenly distributed on the contact surface. The gradient structure includes at least one protrusion;
The speaker according to claim 13. The gradient structure includes at least one recess;
The speaker according to claim 13. The gradient structure is located at the center or end of the contact surface;
The speaker according to claim 13. The gradient structure is installed on one side of the contact surface opposite the user;
The speaker according to claim 13. The gradient structure includes at least one protrusion;
The speaker according to claim 17. The gradient structure includes at least one recess;
The speaker according to claim 17. The gradient structure is located at the center or end of the side of the contact surface;
The speaker according to claim 17. The value of the pressure on the contact surface is between a first threshold value and a second threshold value, the first threshold value being a minimum force to achieve a high transmission efficiency of high frequency vibrations; The second threshold is the maximum force to achieve high transmission efficiency of low frequency vibrations.
The speaker according to claim 13. The first threshold is 0.2N and the second threshold is 1.5N;
The speaker according to claim 21.