• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
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    • 专利摘要:
    sound leakage reduction method in bone conduction speaker and a bone conduction speaker. the present disclosure relates to a method of reducing sound leakage in a bone conduction loudspeaker and the same bone conduction loudspeaker. the bone conduction speaker comprises a housing, a vibration plate and a transducer. at least one sound guide hole is defined in at least a portion of the housing to guide sound waves within the housing to the outside of the housing. the guided wave and the leaked sound wave form an interference so that the amplitude of the leaked sound wave is thus reduced.
    公开号:BR112016015742B1
    申请号:R112016015742-7
    申请日:2014-12-17
    公开日:2022-01-18
    发明作者:Liao Fengyun；Qi Xin
    申请人:Shenzhen Voxtech Co., Ltd；
    IPC主号:
    专利说明:

    FIELD OF APPLICATION OF THE INVENTION
    [01] This application pertains to a bone conduction device, and more specifically, refers to methods and systems for reducing sound leakage from a bone conduction device. STATUS OF THE TECHNIQUE
    [02] A bone conduction speaker, which can be referred to as a vibration speaker, can push human tissue and bones to stimulate the auditory nerve in the cochlea and enable people to hear the sound. The impulse can be generated by generating mechanical vibrations that have the same frequency and amplitude as a sound signal. In some embodiments, the bone conduction speaker is also called a bone conduction headset.
    [03] An exemplary structure of a bone conduction loudspeaker is shown in Figures 1A and 1B. The bone conduction speaker may comprise an open housing 110, a vibration plate 121, a transducer 122, and a connecting component 123. The transducer 122 may transduce electrical signals into mechanical vibrations.
    [04] Vibration plate 121 can be connected to transducer 122 and vibrate synchronously with transducer 122. Vibration plate 121 can stretch from the opening of housing 110 and, upon contact with human skin, pass vibrations to auditory nerves through human tissue and bones which, in turn, allows people to hear sound. Connection member 123 may reside between transducer 122 and housing 110, configured to secure vibration transducer 122 within housing 110. To minimize its effect on vibrations generated by transducer 122, connection member 123 may be made of an elastic material.
    [05] However, the mechanical vibrations generated by the transducer 122 can not only cause the vibration plate 121 to vibrate, but can also cause the housing 110 to vibrate through the connecting component 123. In this way, the mechanical vibrations generated through the bone conduction speaker can push human tissue through the bone plate 121, and at the same time a part of the vibrating plate 121 and housing 110 which are not in contact with human tissue can push air. The sound of air can thus be generated by the air pushed by the vibrating plate portion 121 and the housing 110. The sound of the air can be called "sound leakage". In some cases, sound leakage is harmless. However, sound leakage should be avoided as much as possible if people intend to protect privacy when using bone conduction speaker or try not to disturb others when listening to music.
    [06] In an attempt to solve the problem of sound leakage, document KR10-2009-0082999 discloses a bone conduction speaker with a double magnetic structure and double frame. As shown in Figure 2, the loudspeaker disclosed in this patent comprises a first frame 210 with an open top portion and a second frame 220 that surrounds the exterior of the first frame 210. The second frame 220 is placed separately from the exterior of the first frame. frame 210. The first frame 210 includes a moving coil 230 with the electrical signals, an inner magnetic component 240, an outer magnetic component 250, a magnetic field formed between the inner magnetic component 240, and the outer magnetic component 250. The magnetic component inner 240 and outer magnetic component 250 can vibrate by the attraction and repulsion of the force of coil 230 placed in the magnetic field. A vibration plate 260 connected to moving coil 230 can receive vibration from moving coil 230. Vibration unit 270 connected to vibration plate 260 can pass vibration to the user by skin contact. As provided by the patent, the second frame 220 is arranged around the first frame 210 in order to use the second frame 220 to prevent the vibration of the first frame 210 from dissipating the vibration to the outside, so as to reduce leakage. sound.
    [07] However, since the second frame 220 is fixed to the first frame 210, vibrations of the second frame 220 are unavoidable. As a result, the effect of the second frame 220 is unsatisfactory. In addition, the second frame 220 also increases the speaker's overall volume and weight, which in turn increases cost, complicating the assembly process and reducing speaker reliability and consistency. BRIEF DESCRIPTION OF THE INVENTION
    [08] Thus, the present invention patent describes methods and a system to reduce sound leakage from a bone conduction speaker. The bone conduction speaker may include an open housing, a vibration plate, and a transducer. The transducer can be located inside the housing and configured to generate vibrations. The vibration plate can be configured to be in contact with the skin and pass vibrations. The housing may include at least one sound guide hole configured to guide a sound wave within the housing to the outside of the housing. In some embodiments, the sound wave may be formed by vibrating the air within the housing. In addition, the guided sound wave can interfere with a leaked sound wave, reducing the amplitude of the leaked sound wave. In some embodiments, the leaked sound wave may be formed by vibration of the housing. The present disclosure uses sound interference principles for amplitude reduction in order to achieve sound leakage reduction. This scheme can be very easy to implement and effectively reduces sound leakage without increasing the volume or weight of the bone conduction speaker, thus lowering the cost of the product.
    [09] Embodiments of the present application describe methods and systems of reducing sound leakage from a bone conduction speaker.
    [010] In one aspect, one of the embodiments of the present invention describes a method of reducing the sound leakage of a bone conduction loudspeaker that includes: providing a bone conduction loudspeaker with a vibration plate that passes vibration in human skin, a transducer and a housing having at least one audible guide hole in at least a portion of the housing.
    [011] In some embodiments, the transducer drives the vibrating plate to vibrate. In some embodiments, the housing vibrates through the connection between the vibrating plate and the housing, forming a transmitted sound wave leaking into the air. In some embodiments, the transducer includes a magnetic component and a voice coil. In some embodiments, the transducer includes piezoelectric ceramics.
    [012] The method further includes guiding the sound waves inside the housing that is formed by the vibration of the transducer or other components inside the housing to the outside of the housing. Guidance can be carried out through an acoustic guide hole located in the housing. In some embodiments, the guided sound wave may interfere with the leaked sound wave to reduce the amplitude of the leaked sound wave, thereby reducing sound leakage from the bone conduction speaker.
    [013] In some embodiments, one or more sound guide holes can be installed in an upper portion, and/or in a central portion, and/or in a lower portion of a side wall, and/or in the lower portion. of the wrapper.
    [014] In addition, a damping layer can be applied to a sound guide hole in order to adjust the phase position and amplitude of the leaked sound wave.
    [015] In addition, the sound holes can be arranged in different locations. In some embodiments, different sound guide holes may be configured to generate sound waves with the same or substantially the same phase position. Thus, the different sound guide holes can reduce the leaked sound wave correspondingly with the same wavelength. In some embodiments, different sound guide holes can be configured to generate sound waves with different phase positions. Thus, the different sound guide holes can reduce the leakage of sound waves corresponding to different wavelengths.
    [016] In some embodiments, different parts of the same sound guide hole can be configured to generate the same phase position. For example, different parts of the same pilot hole can reduce the sound wave leaked with the same wavelength. In some embodiments, different parts of the same sonic guide hole may be configured to generate different phase positions. For example, different parts of the same sound guide hole can reduce leakage of sound waves with different wavelengths.
    [017] In another aspect, embodiments of the present invention describe a bone conduction speaker that includes a housing, a vibration plate and a transducer.
    [018] The transducer is configured to generate vibration and is located inside the housing. The vibration plate is configured to be in contact with the skin and pass vibrations. One or more sounding guide holes may be located in at least a portion of the housing. Preferably, a sound guide hole may be configured to guide sound waves within the housing to the outside of the housing. In some embodiments, the guided sound wave may interfere with the hollow sound wave formed by the vibration of the housing, so as to reduce the amplitude of the hollow sound wave.
    [019] In some embodiments, one or more guide holes can be fixed on the side wall and/or on the underside of the housing.
    [020] In some embodiments, the holes that guide one or more sound waves can be located in the upper and/or lower portion of the side wall of the housing.
    [021] In some embodiments, the side wall of the housing is cylindrical. In some embodiments there are at least two sounding guide holes located in the side wall of the housing. In some embodiments, the sonic guide holes are arranged uniformly or not in one or more circles. In some embodiments, the sonic guide holes are located at different heights along the axial direction of the cylindrical side wall.
    [022] In some embodiments there are at least two sounding holes located at the bottom of the housing. In some embodiments, the sonic guide holes are distributed evenly or unevenly in one or more circles around the center of the bottom, and/or a sonic guide hole is located in the center of the bottom of the housing.
    [023] In some embodiments, the sonic guide hole is a drillable hole. In some embodiments, there may be a cushioning layer that protects the hole opening. Cushioning layers include an adjustment paper, adjustment cotton, non-woven fabric, silk, cotton, sponge or rubber.
    [024] In some embodiments, the shape of the sound guide hole is circular, elliptical, quadrangular, rectangular or linear. In some embodiments, several sonic guide holes are configured to be the same or different shapes. BRIEF DESCRIPTION OF THE DRAWINGS
    [025] The present description is further described in terms of the exemplary embodiments. These exemplary embodiments are described in detail with reference to the drawings. These embodiments are non-limiting examples, where like reference numerals represent similar structures in all different views of the drawings:
    [026] Figures 1A and 1B are schematic structures illustrating a prior art bone conduction speaker;
    [027] Figure 2 is a schematic structure illustrating another prior art bone conduction speaker;
    [028] Figure 3 illustrates the principle of sound interference according to some embodiments of the present invention;
    [029] Figures 4A and 4B are schematic structures of an exemplary bone conduction speaker in accordance with some embodiments of the present invention;
    [030] Figure 4C is a schematic structure of a bone conduction speaker in accordance with some embodiments of the present invention;
    [031] Figure 4D is a diagram illustrating the sound leakage of the bone conduction speaker in accordance with some embodiments of the present invention;
    [032] Figure 5 is a diagram illustrating the curves of equal sound intensity levels according to some embodiments of the present invention;
    [033] Figure 6 is a flowchart of an exemplary process for reducing sound leakage from a bone conduction speaker, in accordance with some embodiments of the present invention;
    [034] Figures 7A and 7B are schematic structures of an exemplary bone conduction speaker, according to some embodiments of the present invention;
    [035] Figure 7C is a diagram illustrating sound leakage from a bone conduction speaker, according to some embodiments of the present invention;
    [036] Figures 8A and 8B are schematic structures of an exemplary bone conduction speaker, according to some embodiments of the present invention;
    [037] Figure 8C is a diagram illustrating sound leakage from a bone conduction speaker, according to some embodiments of the present invention;
    [038] Figures 9A and 9B are schematic structures of an exemplary bone conduction speaker, according to some embodiments of the present invention;
    [039] Figure 9C is a diagram illustrating sound leakage from a bone conduction speaker, according to some embodiments of the present invention;
    [040] Figures 10A and 10B are schematic structures of an exemplary bone conduction speaker, according to some embodiments of the present invention;
    [041] Figure 10C is a diagram illustrating reduced sound leakage in a bone conduction speaker, in accordance with some embodiments of the present invention;
    [042] Figures 11A and 11B are schematic structures of an exemplary bone conduction speaker, according to some embodiments of the present invention;
    [043] Figure 11C is a diagram illustrating reduced sound leakage in a bone conduction speaker, in accordance with some embodiments of the present invention;
    [044] Figures 12A and 12B are schematic structures of an exemplary bone conduction speaker, in accordance with some embodiments of the present invention; and
    [045] Figures 13A and 13B are schematic structures of an exemplary bone conduction speaker, in accordance with some embodiments of the present disclosure.
    [046] The meanings of the numbers marked in the figures are as follows: 110, open housing; 121, vibration plate; 122, transducer; 123, connecting component; 210, first frame; 220, second frame; 230, moving coil; 240, internal magnetic component; 250, external magnetic component; 260; vibration plate; 270, vibration unit; 10, casing; 11, side walls; 12, bottom; 21, vibration plate; 22, transducer; 23, connecting component; 24, elastic component; 30, sound guide hole. DETAILED DESCRIPTION OF THE INVENTION
    [047] While illustrative embodiments have been described herein, the scope of any and all of these embodiments has equivalent elements, changes, omissions, combinations (e.g., aspects in various embodiments), adaptations, and/or modifications. as would be appreciated by those of skill in the art based on the present disclosure. The limitations on the claims are to be interpreted broadly based on the language employed in the claims and are not limited to the examples described in the present specification or during examination of the application. The examples should be understood as non-restrictive. Furthermore, the steps of the described processes can be modified in any way, including, reordering steps and/or inserting or removing steps. It is therefore intended that the specification and examples be regarded as illustrative only, with a spirit and scope truly being indicated by the following claims and their full scope by their equivalents.
    [048] To explain the scheme of embodiments of the present descriptive embodiment, the design principles of the present descriptive embodiment will be described below.
    [049] Figure 3 illustrates the principles of sound interference in accordance with some embodiments of the present disclosure. Two or more sound waves can interfere in space based on, for example, the frequency and/or amplitude of the waves. Specifically, the amplitudes of sound waves with the same frequency can be superimposed to generate a strengthened wave or a weakened wave.
    [050] As shown in Figure 3, sound source 1 and sound source 2 have the same frequency and are located in different positions in space. The sound waves generated from these two sound sources can meet at an arbitrary point. If the phase positions of sound wave 1 and sound wave 2 are the same at point A, the amplitudes of the two sound waves can be added together, generating a strengthened sound wave signal at point A. On the other hand, if the positions of phase of the two sound waves are opposite at point A, their amplitudes can be compensated, and a weakened sound wave signal is generated at point A.
    [051] Embodiment 01
    [052] Figures 4A and 4B are schematic structures of an exemplary bone conduction speaker. The bone conduction speaker may include a housing 10, a vibration plate 21, and a transducer 22. The transducer 22 may be within the housing 10 and configured to generate vibrations. Housing 10 may have one or more sounding holes 30. Housing 10 may also include a side wall 11 and a bottom 12. Simply, by way of example, one or more sounding holes 30 may be in the side wall 11 of the housing 10, as illustrated in Figure 4B. Additionally or alternatively, one or more sound guide holes may be at the bottom 12 of the housing 10. The sound guide hole(s) 30 may be configured to guide sound waves from within the housing 10 to the outside of the housing 10. In some embodiments, the guided sound waves may form interference with the void sound waves generated by the vibrations of the housing 10, so as to reduce the amplitude of the void sound waves. The transducer 22 can be configured to convert an electrical signal into mechanical vibrations. For example, an electrical audio signal can be transmitted to a voice coil, which is placed on a magnet, and the electromagnetic interaction can cause the voice coil to vibrate based on the electrical audio signal. As another example, transducer 22 may include piezoelectric ceramics, shape changes, which may cause vibrations in accordance with received electrical signals.
    [053] In addition, the vibration plate 21 can be connected to the transducer 22 and configured to vibrate together with the transducer 22. The vibration plate 21 can extend out of the opening of the housing 10 and touch the user's skin and transmit vibrations to the auditory nerves through human tissue and bones, which in turn allow the user to hear sound. Connector 23 may reside between transducer 22 and housing 10, and configured to secure vibration transducer 122 within the housing. Connector 23 may include one or more separate components, or may be integrated with transducer 22, or housing 10. In some embodiments, connector 23 is made of an elastic material.
    [054] The transducer 22 can cause the vibration plate 21 to vibrate. The transducer 22, which resides within the housing 10, may vibrate. Vibrations from transducer 22 can cause air within housing 10 to vibrate, producing a sound wave within housing 10, which may be referred to as "inside housing sound wave". Once the vibration plate 21 and the transducer 22 are attached to the housing 10 via the connecting member 23, vibrations can pass to the housing 10, causing the housing 10 to vibrate synchronously. The vibrations of the housing 10 can generate a leaky sound wave, which extends outwards, like the sound leak.
    [055] The sound wave inside the housing and the hollow sound wave are like the two sound sources in Figure 3. In some embodiments, the side wall 11 of the housing 10 may have one or more sound guide holes 30 configured to guide the sound wave from the inside of the housing 10 to the outside. The sound wave guided through the sound guide hole(s) 30 may interfere with the leaked sound wave generated by the vibrations of the housing 10, and the amplitude of the leaked sound wave may be reduced due to interference, which can result in a reduction in sound leakage.
    [056] In some embodiments, the sound guide hole 30 may be attached to the upper portion of the side wall 11. As used herein, the upper portion of the side wall 11 refers to the portion of the side wall 11 from the top of the side wall (in contact with the vibration plate 21) to about 1/3 of the height of the side wall.
    [057] Figure 4C is a schematic structure of the bone conduction speaker illustrated in Figures 4A and 4B. The structure of the bone conduction speaker is further illustrated with the mechanical elements illustrated in Figure 4C. As shown in Figure 4C, the connecting member 23 between the side wall 11 of the housing 10 and the vibration plate 21 can be represented by an elastic element 23 and a damping element in the parallel connection. The connecting relationship between the vibration plate 21 and the transducer 22 can be represented by an elastic element 24.
    [058] On the outer side of housing 10, the reduction in sound leakage is proportional to Equation 1.
    [059] Equation 1:

    [060] where Sfuro is the area of the opening of the sonic guide hole 30, Sin-enclosure is the area of the enclosure 10 (e.g. side wall 11 and bottom 12) that is not in contact with the human face.
    [061] The pressure inside the housing can be expressed in Equation 2.
    [062] Equation 2: P = (Pa + Pb + Pc + PJ
    [063] where Pa, Pb, Pc and Pe are the sound pressures of an arbitrary point inside the enclosure 10 generated by an a-side, b-side, c-side and e-side (as illustrated in Figure 4C), respectively. As used herein, side a refers to the upper surface of the transducer 22 which is close to the vibration plate 21, the side b refers to the lower surface of the vibration plate 21 which is close to the transducer 22, the side c refers to the upper inner surface of the lower part 12 which is close to the transducer 22, and the side e refers to the lower surface 22 of the transducer which is close to the lower part 12.
    [064] The center of side b, point O, is defined as the origin of spatial coordinates, and side b can be defined as the z=0 plane, so Pa, Pb, Pc and Pe can be expressed as follows:
    [065] Equation 3:
    [066]

    [067] Equation 4:
    [068]

    [069] Equation 5:
    [070]

    [071] Equation 6:
    [072]

    [073] Equation 7:
    is the distance between the observation point (x,y,x) and the point a on the side (x',y',0); Sa, Sb, Sc and Se are the areas of side a, side b, side c and side e, respectively.
    [074] Equation 8:
    is the distance between the observation point (x,y,z) and the point a on the side a(xa',ya',za').
    [075] Equation 9:
    is the distance between the observation point (x,y,z) and the point a on the side c(xcz,ycz,Zcz).
    [076] Equation 10:
    is the observation point (x,y,z) and the point a on the side e(xe',ye',ze').
    [077] Equation 11:

    [078] where u is the speed of sound, po is the density of air, w is the angular frequency of vibration.
    [079] PaR, PbR, PcR and Per are air acoustic resistances, which are respectively:
    [080] Equation 12:

    [081] Equation 13:

    [082] Equation 14:

    [083] Equation 15:

    [084] where r is the acoustic resistance per unit of length, r' is the sound quality per unit of length, za is the distance between the observation point and side a, zb is the distance between the observation point and the b side, zc is the distance between and the observation point of the c side, ze is the distance between the observation point and the e side.
    [085] Wa(x,y), Wb(x,y), Wc(x,y), We(x,y) and Wd(x,y) are the source of sound energy per unit area of side a , labo b, side c and side d, respectively, which can be derived from equations 16:
    [086] Equations 16:
    [087]

    [088]

    [089]

    [090]

    [091] where F is the driving force generated by the transducer 22, Fa, Fb,Fc,Fd, and Fe are the driving forces of side a, side b, side c, side d and side e, respectively. As used herein, the d-side is the outer surface of the bottom 12. Sd is the d-side region, f is the viscous resistance formed in the small gap between the housing 10 and the transducer 22, f =qΔs(dv/dy ), L is the equivalent load on the human face when the vibration plate acts on a human face, Yis the energy dissipated in the elastic element 24, kF and k9 are the elastic coefficients of the elastic element 23 and elastic element 34, respectively, h is the fluid viscosity coefficient, dv/dy is the fluid velocity gradient, Δs is the cross-sectional area of an object (plate), A is the amplitude, is the sound field region, δ is an order minimum high (which is generated by the incomplete symmetrical shape of the housing).
    [092] The sound pressure of an arbitrary point outside the housing, generated by the vibration of the housing 10 is expressed by Equation 17:
    [093] Equation 17:

    [094] In what
    is the distance between the observation point (x,y,z) and the point on the d side (xdz,ydz, zd).
    [095] The sound pressure of a hole in the housing is expressed as

    [096] As described elsewhere, sound leakage is a result of housing vibrations 1). For illustrative purposes, the sound pressure generated by enclosure 1) can be expressed as

    [097] The leaked sound wave and the interference of guided sound waves result in a weakened sound wave, i.e. to make
    have the same value but opposite directions, and sound leakage can be reduced in some embodiments,
    can be adjusted to reduce sound leakage as long as
    corresponds to information on the phase positions and amplitudes of one or more holes, which further refer to the dimensions of the bone conduction speaker housing, the frequency of the vibration transducer, the position, shape, quantity and/or size. of the sound guide hole and if there is damping inside the holes. Thus, the position, shape and quantity of sonic guide holes and/or damping materials can be adjusted to reduce sonic leakage.
    [098] In accordance with the above formulas, one of ordinary skill in the art would understand that the effectiveness of sound leakage reduction is related to the dimensions of the bone conduction speaker housing, the frequency of the vibration transducer, the position, shape, quantity and size of the audible guide hole(s) and whether there is dampening inside the audible guide hole(s).
    [099] Consequently, various configurations, depending on specific needs, can be achieved by specifically choosing the position where the audible guide hole(s) are located, the shape and/or quantity of the audible guide hole(s), as well as the material. of damping.
    [0100] Figure 5 is a diagram illustrating sound intensity level curves in accordance with some embodiments of the present disclosure. The horizontal coordinate is the frequency, while the vertical coordinate is the sound pressure level (SPL). As used herein, SPL refers to the change in atmospheric pressure after it has been disturbed, i.e., a pressure in excess of atmospheric pressure, which is equivalent to an atmospheric pressure added to a pressure change caused by the disturbance. As a result, sound pressure can reflect the amplitude of a sound wave. In Figure 5, in each curve, the sound pressure levels corresponding to different frequencies are different, while the intensity levels felt by human ears are the same. For example, each curve is labeled with a number that represents the intensity level of that curve. According to the curves of equal sound intensity levels, when the volume (sound pressure amplitude) is smaller, human ears are not sensitive to high or low frequency sounds; when the volume is higher, human ears are more sensitive to high or low frequency sounds. Bone conduction speakers can generate sound relative to different frequency ranges, such as 1000Hz~4000Hz, or1000Hz~4000Hz or 1000Hz~3500Hz or 1000Hz~3000Hz or 1500Hz~3000Hz. Sound leakage within the aforementioned frequency ranges may be sound leakage intended to be reduced as a priority.
    [0101] Figure 4D is a diagram illustrating the effect of sound leakage reduction, in accordance with some embodiments of the present disclosure. The bone conduction speaker to be tested includes a cylindrical housing that includes a side wall and a bottom, as described in Figures 4A and 4B. The cylindrical housing has a radius of 22 millimeters, the height of the side wall of 14 millimeters and a plurality of sounding guide holes to be created in the upper portion of the side wall of the housing. Sound guide hole openings are rectangular. Sound guide holes are evenly arranged on the side wall. The target region where sound leakage will be reduced is 50 centimeters away from the outside of the bottom of the housing. The distance of the leaked sound wave spreading to the target region and the distance of the sound wave spreading from the surface of the transducer 20 through the sound guide holes 20 to the target region have a phase difference of about of 180 degrees. As shown, the leaked sound wave is dramatically reduced in the target region or even eliminated.
    [0102] According to the embodiments in the present described embodiment, which should be known to those of ordinary skill in the art, the effectiveness of reducing sound leakage after configuring sound guide holes is very evident. As shown in Figure 4D, the bone conduction speaker has audible guide holes that significantly reduce sonic leakage compared to the bone conduction speaker without audible guide holes.
    [0103] In the tested frequency range, after setting the sound guide holes, sound leakage is reduced by about 10 dB on average. Specifically, in the frequency range of 1500Hz ~ 3000Hz, sound leakage is reduced by more than 10 dB.
    [0104] In the frequency range of 2000Hz~2500Hz, the sound leakage is reduced by more than 20dB compared to the speaker without sound guide holes.
    [0105] A person skilled in the art can understand from the above formulas that when bone conduction speaker dimensions, target regions for sound leakage reduction and sound wave frequencies are different, the position, shape and quantity of sounding guide holes will also necessarily be adjusted accordingly.
    [0106] For example, in a cylinder housing, according to different needs, a plurality of sounding guide holes can be in the side wall and/or in the lower part of the housing. Preferably, the sonic guide hole can be fitted over the top and/or bottom of the sidewall portion of the housing. The number of sound guide holes defined in the side wall of the housing is not less than two. Preferably, the sonic guide holes may or may not be arranged uniformly in one or more circles with respect to the center of the bottom. In some embodiments, sonic guide holes may be arranged in at least one circle. In some embodiments, a sonic guide hole may be attached to the underside of the housing. In some embodiments, the sonic guide hole may be fitted in the center of the underside of the housing.
    [0107] The number of audible guide holes can be one or more. Preferably, several sounding guide holes can be symmetrically defined on the housing. In some embodiments, there are 6 to 8 sonic guide holes arranged circularly.
    [0108] Sound guide hole openings can be circular, elliptical, rectangular or slotted. Slit generally means to cut, along with straight lines, curve lines, or arc lines. Different audible guide holes in a bone conduction speaker can be the same or different shapes.
    [0109] It should be noted that the above description is for illustrative purposes only, and is not intended to limit the scope of disclosure. A person of ordinary skill in the art can understand that while the side wall of the housing may not be cylindrical, the sonic guide holes may be arranged asymmetrically as required. Various configurations can be achieved by creating different combinations of shape, amount and position of sound orientation. Some other embodiments along with the figures are described as follows.
    [0110] Embodiment 02
    [0111] Figure 6 is a flowchart of an exemplary process of reducing sound leakage from a bone conduction speaker, in accordance with some embodiments of the present disclosure. At 601, a bone conduction speaker is provided including a vibration plate 21 that passes vibrations to a transducer 22, and a housing 10. At least one sound guide hole 30 is disposed on the housing 10. At 602, the plate The vibration plate 21 is driven by the transducer 22, causing the vibration plate 21 to vibrate. At 603, a leaked sound wave, due to the vibrations of the casing, is formed, in which the leaked sound wave is transmitted in the air. At 604, a guided sound wave passing through at least one sound guide hole 30 from the inside to the outside of the housing 10. The guided sound wave interferes with the leaked sound wave, reducing sound leakage from the bone conduction speaker. .
    [0112] Sound guide holes 30 are preferably fixed in different positions of the housing 10.
    [0113] The effectiveness of sonic leakage reduction can be determined by the formulas and method as described above, on the basis of which the sonic guide hole positions can be determined.
    [0114] A damping layer is preferably situated in a sonic guide hole 30 to adjust the phase position and amplitude of the sound wave transmitted through sonic guide hole 30.
    [0115] In some embodiments, different sound guide holes can generate different sound waves with the same phase position to reduce the leaked sound wave having the same wavelength. In some embodiments, different sound guide holes can generate different sound waves having different phase positions to reduce sound waves with different void wavelengths.
    [0116] In some embodiments, different parts of a sound guide hole 30 can be configured to generate sound waves with the same phase position in order to reduce leaked sound waves with the same wavelength. In some embodiments, different parts of a sonic guide hole 30 can be configured to generate sound waves with different phase positions to reduce sound waves with different void wavelengths.
    [0117] Also, the sound wave inside the enclosure can be processed to basically have the same value but with opposite phase positions of the leaked sound wave, so that the sound leakage can be further reduced.
    [0118] Embodiment 03
    [0119] Figures 7A and 7B are schematic structures illustrating an exemplary bone conduction speaker, in accordance with some embodiments of the present disclosure. The bone conduction speaker may include an open housing 10, a vibration plate 21 and a transducer 22. The housing 10 may be cylindrical and have a side wall and a bottom. A plurality of sounding guide holes 30 may be arranged in the lower portion of the side wall (i.e., from about 2/3 of the height of the side wall to the bottom). The number of sounding holes 30 can be 8, the openings of sounding holes 30 can be rectangular. Sound guide holes 30 can be arranged evenly or evenly in one or more circles in the side wall of housing 10.
    [0120] In the embodiment, the transducer 22 is preferably based on the principle of electromagnetic transduction. The transducer can include components such as magnetizer, voice coil, among others, and the components can be set inside the housing and can generate vibration synchronized with the same frequency.
    [0121] Figure 7C is a diagram illustrating reduced sound leakage in accordance with some embodiments of the present disclosure. In the frequency range of 1400Hz~4000Hz, sound leakage is reduced by more than 5dB, and in the frequency range of 2250Hz~2500Hz, sound leakage is reduced by more than 20dB.
    [0122] Embodiment 04
    [0123] Figures 8A and 8B are schematic structures illustrating an exemplary bone conduction speaker in accordance with some embodiments of the present disclosure. The bone conduction speaker may include an open housing 10, a vibration plate 21, and a transducer 22. The housing 10 is cylindrical and has a side wall and a bottom. Sound guide holes 30 may be disposed in the central part of the side wall of the housing (i.e. from about 1/3 of the height of the side wall to 2/3 of the height of the side wall). The number of sounding holes 30 can be 8, and the openings (and cross sections) of sounding holes 30 can be rectangular. Sound guide holes 30 may or may not be arranged uniformly in one or more circles on the side wall of housing 10.
    [0124] In the embodiment, the transducer 21 can be implemented preferably based on the principle of electromagnetic transduction. The transducer 21 can include components such as magnetizer, voice coil, among others, which can be placed inside the housing and can generate synchronous vibrations with the same frequency.
    [0125] Figure 8C is a diagram illustrating reduced sound leakage. In the frequency range of 1000Hz ~ 4000Hz, the sound leakage reduction effectiveness is great.
    [0126] For example, in the frequency range of 1400Hz~2900Hz, sound leakage is reduced by more than 10dB; In the frequency range of 2200Hz~2500Hz, sound leakage is reduced by more than 20dB.
    [0127] It is illustrated that the effectiveness of reduced sound leakage can be adjusted by changing the positions of the sound guide holes while keeping other parameters related to the sound guide holes unchanged.
    [0128] Embodiment 05
    [0129] Figures 9A and 9B are schematic structures of an exemplary bone conduction speaker, in accordance with some embodiments of the present disclosure. The bone conduction speaker may include an open housing 10, a vibration plate 21 and a transducer 22. The housing 10 is cylindrical, with a side wall and a bottom. One or more punchable sound guide holes 30 can be arranged along the circumference of the lower part. In some embodiments, there may be 8 audible guide holes 30 regularly unequally arranged in one or more circles at the bottom of the housing 10. In some embodiments, the shape of one or more of the audible guide holes 30 may be rectangular.
    [0130] In the embodiment, the transducer 21 can be implemented preferably based on the principle of electromagnetic transduction. The transducer 21 can include components such as a magnetizer, voice coil, among others, which can be placed inside the housing and can generate vibration synchronized with the same frequency.
    [0131] Figure 9C is a diagram illustrating the effect of reduced sound leakage. In the frequency range of 1000Hz~3000Hz, the sound leakage reduction effectiveness is excellent. For example, in the frequency range of 1700Hz ~ 2700Hz, sound leakage is reduced by more than 10 dB; In the frequency range of 2200Hz~2400Hz, sound leakage is reduced by more than 20dB.
    [0132] Embodiment 06
    [0133] Figures 10A and 10B are schematic structures of an exemplary bone conduction speaker, in accordance with some embodiments of the present disclosure. The bone conduction speaker may include an open housing 10, a vibration plate 21 and a transducer 22. One or more pierceable sound guide holes 30 may be disposed in both the upper and lower portions of the side wall of the housing 10. Sound guide holes 30 may or may not be arranged uniformly in one or more circles at the top and bottom of the side wall of housing 10. In some embodiments, the amount of sound guide holes 30 in each circle may be 8 , and the upper sounding holes portion and the lower sounding holes portion may be symmetrical with respect to the central cross section of the housing 10.
    [0134] In some embodiments, the shape of the sound guide holes 30 may be circular.
    [0135] The shape of the audible guide holes at the top and the shape of the audible guide holes at the bottom may be different. One or more damping layers can be arranged in the sound guide holes to reduce leaking sound waves of the same wavelength (or frequency), or to reduce leaking sound waves of different wavelengths.
    [0136] Figure 10C is a diagram illustrating the effect of sound leakage reduction in accordance with some embodiments of the present disclosure. In the frequency range of 1000Hz~4000Hz, the sound leakage reduction effectiveness is excellent. For example, in the frequency range of 1600Hz ~ 2700Hz, sound leakage is reduced by more than 15dB; In the range of 2000Hz ~ 2500Hz, where the effectiveness of sound leakage reduction is the most remarkable, sound leakage is reduced by more than 20 dB. Compared to Embodiment 03, this scheme has a relatively balanced effect of reduced sound leakage over various frequency ranges, and this effect is better than the effect of schemes where the hole heights are fixed, such as the embodiments 03, 04, 05 and so on.
    [0137] Embodiment 07
    [0138] Figures 11A and 11B are schematic structures illustrating a bone conduction speaker in accordance with some embodiments of the present disclosure.
    [0139] The bone conduction speaker may include an open housing 10, a vibration plate 21 and a transducer 22. One or more pierceable sound guide holes 30 may be defined in the upper and lower portions of the side wall of the housing 10. and at the bottom of the housing 10. The sounding holes 30 in the side wall are arranged uniformly or not in one or more circles in the upper and lower parts of the side wall of the housing 10. In some embodiments, the number of holes- sound guides 30 in each circle may be 8, and the upper sound guide holes portion and the lower sound guide holes portion may be symmetrical with respect to the central cross section of the housing 10. In some embodiments, the shape of the sounding guide holes 30 may be rectangular. There may be four sounding holes 30 in the lower part of the housing 10. The four sounding holes 30 may be linear in elongated arc shapes, and may or may not be arranged uniformly in one or more circles with respect to the center of the lower part.
    [0140] In addition, the sounding guide holes 30 may include a circular punch hole in the center of the bottom.
    [0141] Figure 11C is a diagram illustrating the effect of sound leakage reduction of the embodiment. In the frequency range of 1000Hz~4000Hz, the sound leakage reduction effectiveness is excellent. For example, in the frequency range of 1300Hz ~ 3000Hz, sound leakage is reduced by more than 10 dB; In the frequency range of 2000Hz~2700Hz, the sound leakage is reduced by more than 20dB.
    [0142] Compared to Embodiment 03 three, this scheme has a relatively balanced effect of reduced sound leakage within various frequency ranges, and this effect is better than the effect of schemes in which the height of the holes are fixed, such as such as Embodiment 03, 04, 05. Compared with Embodiment 06, in the frequency range of 1000Hz ~ 1700Hz and 2500Hz ~ 4000Hz, this scheme has a better effect of reduced sound leakage.
    [0143] Embodiment 08
    [0144] Figures 12A and 12B are schematic structures illustrating a bone conduction speaker, in accordance with some embodiments of the present disclosure.
    [0145] The bone conduction loudspeaker may include an open housing 10, a vibration plate 21 and a transducer 22. The pierceable sound guide holes 30 may be attached to the upper portion of the side wall of the housing 10. One or more Sound guide holes may be arranged uniformly or non-uniformly in one or more circles in the upper portion of the side wall of the housing 10, there may be eight sound guide holes 30, and the shape of the sound guide holes 30 may be circular.
    [0146] After comparing calculation results and test results, the effectiveness of this embodiment is basically the same as that of Embodiment 01, and in this embodiment can effectively reduce the sound loss.
    [0147] Embodiment 09
    [0148] Figures 13A and 13B are schematic structures illustrating a bone conduction speaker, in accordance with some embodiments of the present disclosure.
    [0149] The bone conduction speaker may include an open housing 10, a vibration plate 21 and a transducer 22.
    [0150] Sound guide holes 30 can be arranged on the upper, central and lower portions of side wall 11. Sound guide holes 30 are arranged uniformly or non-uniformly in one or more circles. Different circles are formed by the sound guide holes 30, one of which is located along the circumference of the lower part 12 of the housing 10. The size of the sound guide holes 30 are the same.
    [0151] This scheme can have a relatively balanced effect in reducing sound leakage over various frequency ranges compared to schemes where the hole position is fixed.
    [0152] Embodiment 10
    [0153] Sound guide holes 30 in the above embodiments may be unshielded pierceable holes.
    [0154] In order to adjust the effect of sound waves guided by the sound guide holes, a damping layer (not shown in the figures) can be located at the opening of the sound guide holes 30 to adjust the phase position and/or the sound wave amplitude.
    [0155] There are multiple variations of the materials and positions of the damping layer. For example, the dampening layer can be made of materials that can dampen sound waves, such as paper in fit, cotton in fit, non-woven fabric, silk, cotton, sponge or rubber. The damping layer may be attached to the inner wall of the sound guide hole 30, or they may protect the sound guide hole 30 from the outside.
    [0156] Preferably, the damping layers corresponding to the different sonic guide holes 30 can be arranged so as to adjust the sound waves from different sonic guide holes to generate the same phase position. Adjusted sound waves can be used to reduce leaky sound waves having the same wavelength. Alternatively, the different sonic guide holes 30 can be arranged to generate different phase positions to reduce the leaked sound wave having different wavelengths (i.e., leaked sound waves having specific wavelengths).
    [0157] In some embodiments, different portions of the same sound guide hole can be configured to generate the same phase position to reduce sound waves leaked at the same wavelength (e.g. using a pre-damping layer). -adjusted to the shape of stairs or steps). In some embodiments, different parts of the same sound guide hole can be configured to generate different phase positions to reduce sound waves leaking at different wavelengths.
    [0158] It is apparent that the above statements are preferred embodiments and technical principles. It will be readily understood by a person of ordinary skill in the art that this description is not limited to the specific embodiments indicated, and a person of ordinary skill in the art can make various obvious variations, adjustments, and provide substitutes within the scope of this protected disclosure. Therefore, while the above embodiments are present in the form described in detail, this disclosure is not limited to the embodiments, and there may be many other equivalent embodiments within the scope of the present disclosure, the scope protected by this disclosure being determined by the claims.
    权利要求:
    Claims (17)
    [0001]
    1. BONE CONDUCTED SPEAKER comprising a housing (10) that encloses a vibration plate (21) and a transducer (22) configured to cause the vibration plate (21) and housing (10) to vibrate, where the vibration of the housing (10) produces a hollow sound wave, characterized in that it has at least one sound guide hole (30) located in the housing (10) and configured to guide a sound wave inside the housing (10) to one side exterior of the housing (10).
    [0002]
    2. BONE CONDUCTED SPEAKER according to claim 1, characterized in that at least one sound guide hole (30) includes two sound guide holes (30) located in the housing (10).
    [0003]
    3. BONE CONDUCTION SPEAKER, according to claim 1, characterized in that the housing (10) includes a lower part (12) or a side wall (11); and at least one sound guide hole (30) located in the lower part (12) or in the side wall (11) of the housing (10).
    [0004]
    4. BONE CONDUCTION SPEAKER, according to claim 1, characterized in that the housing (10) includes a cylindrical side wall, and at least one sound guide hole (30) located in the cylindrical side wall.
    [0005]
    5. BONE CONDUCTION SPEAKER, according to claim 1, characterized in that the two sound guide holes (30) are located at different heights along the axial direction of the side wall (11).
    [0006]
    6. BONE CONDUCTED SPEAKER, according to claim 1, characterized in that at least one sound guide hole (30) is located in the center of the lower part (12).
    [0007]
    7. BONE CONDUCTION SPEAKER, according to claim 1, characterized in that at least one sound guide hole (30) is a perforable hole.
    [0008]
    8. BONE CONDUCTION SPEAKER, according to claim 1, characterized in that the shape of at least one sound-guide hole (30) is circular, elliptical, quadrangular or linear.
    [0009]
    9. BONE CONDUCTION SPEAKER, according to claim 1, characterized in that the transducer (22) includes a magnetic component and a voice coil; or piezoelectric ceramics.
    [0010]
    10. BONE CONDUCTED SPEAKER, according to claim 1, characterized in that at least one sound guide hole (30) includes a muffling layer configured to adjust the phase and amplitude of the guided sound wave.
    [0011]
    11. BONE CONDUCTED SPEAKER, according to claim 11, characterized in that the muffling layer is an adjustment paper, adjustment cotton, a non-woven fabric, a silk, a cotton, a sponge or a rubber.
    [0012]
    12. BONE CONDUCTED SPEAKER, according to claim 1, characterized in that at least one sound guide hole (30) includes at least two parts configured to generate at least two sound waves with the same phase and configured to reduce the amplitude of the leaked sound wave having the same wavelength.
    [0013]
    13. BONE CONDUCTED SPEAKER, according to claim 1, characterized in that at least one sound-guide hole (30) includes at least two different portions configured to generate at least two sound waves with different phases and configured to reduce the amplitude of the leaked sound wave having different wavelengths.
    [0014]
    14. METHOD OF REDUCTION OF SOUND LEAKAGE IN BONE CONDUCTED SPEAKER claimed in 1, characterized in that at least one sound guide hole (30) located in the housing (10) is configured to guide a sound wave within the housing through at least one sound guide hole (30) on an outer side of the housing, the guided sound wave interfering with the leaked sound wave, the interference reducing an amplitude of the leaked sound wave.
    [0015]
    15. METHOD OF REDUCTION OF SOUND LEAKAGE IN BONE CONDUCTION SPEAKER, according to claim 14, characterized in that the location of at least one sound guide hole (30) is determined based on at least one of : a frequency of vibration of the transducer (22), a shape of at least one sonic guide hole (30), an amount of at least one sonic guide hole (30), a target region where the amplitude of the sound wave leaked will be reduced, or a range of frequencies within which the amplitude of the leaked sound wave will be reduced.
    [0016]
    16. METHOD OF REDUCTION OF SOUND LEAKAGE IN BONE CONDUCTION SPEAKER, according to claim 14, characterized in that the guided sound wave includes at least two sound waves with the same phase, and at least two sound waves configured to reduce the amplitude of the leaked sound wave having the same wavelength.
    [0017]
    17. METHOD OF REDUCTION OF SOUND LEAKAGE IN BONE CONDUCTION SPEAKERS, according to claim 14, characterized in that the guided sound wave includes at least two sound waves with different phases, and at least two sound waves configured to reduce the amplitude of the leaked sound wave having different wavelengths.
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    同族专利:
    公开号 | 公开日
    KR20170061188A|2017-06-02|
    US10149071B2|2018-12-04|
    KR102179023B1|2020-11-18|
    CN103716739B|2016-11-02|
    ES2753428T3|2020-04-08|
    KR102186338B1|2020-12-04|
    CN106470371A|2017-03-01|
    CN103716739A|2014-04-09|
    WO2015101181A1|2015-07-09|
    EP3606089A1|2020-02-05|
    US20190327566A1|2019-10-24|
    US10334372B2|2019-06-25|
    US20190132689A1|2019-05-02|
    PT3094103T|2019-11-06|
    US20200213780A1|2020-07-02|
    PL3094103T3|2020-06-15|
    US20170374479A1|2017-12-28|
    KR20170061184A|2017-06-02|
    US10616696B2|2020-04-07|
    CN106303861A|2017-01-04|
    BR112016015742A2|2020-08-04|
    EP3094103B1|2019-10-09|
    EP3094103A1|2016-11-16|
    EP3094103A4|2017-04-19|
    CN106303861B|2018-06-12|
    KR20200131343A|2020-11-23|
    JP2017502615A|2017-01-19|
    CN106470371B|2018-02-27|
    DK3094103T3|2019-11-11|
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    KR20160110365A|2016-09-21|
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    US20160329041A1|2016-11-10|
    US10848878B2|2020-11-24|
    KR20210086718A|2021-07-08|
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    法律状态:
    2020-03-31| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2021-11-03| B350| Update of information on the portal [chapter 15.35 patent gazette]|
    2021-11-23| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
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    申请号 | 申请日 | 专利标题
    CN201410005804.0|2014-01-06|
    CN201410005804.0A|CN103716739B|2014-01-06|2014-01-06|A kind of method suppressing bone-conduction speaker leakage sound and bone-conduction speaker|
    PCT/CN2014/094065|WO2015101181A1|2014-01-06|2014-12-17|Method for suppressing sound leakage of bone conduction loudspeaker and bone conduction loudspeaker|
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