Bone conduction speaker and bone conduction hearing aid

Abstract

The present application relates to a bone conduction technology. Disclosed are a bone conduction speaker and a bone conduction hearing aid. The bone conduction speaker comprises a vibration sound producer and a housing, wherein the housing is provided with an accommodating compartment for accommodating the vibration sound producer, the vibration sound producer is connected to the accommodating compartment, the housing is made of a zirconium oxide material, and a portion of the housing is configured to fit to the skin and transmit to the skin vibration generated by the vibration sound producer. According to the bone conduction speaker and the bone conduction hearing aid in the present application, the housing made of the zirconium oxide material can more efficiently transmit the vibration to the skull bone, thereby reducing energy loss, and thus enhancing the intensity and clarity of sound.

Description

Bone conduction loudspeakers and bone conduction hearing aids

[0001] Cross-references to related applications

[0002] This disclosure claims priority to Chinese Patent Application No. 2025103475617, filed on March 24, 2025, entitled "Bone Conduction Loudspeaker and Bone Conduction Hearing Aid", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of bone conduction technology, and more specifically, to a bone conduction loudspeaker and a bone conduction hearing aid. Background Technology

[0004] Bone conduction is a mechanism that transmits sound waves through the bones to induce hearing. Bone conduction headphones, bone conduction glasses, and other bone conduction hearing aids use vibrations generated by a bone conduction vibrating sound-generating device to allow users to perceive sound.

[0005] In bone conduction sound devices, the speaker housing is typically made of common materials such as rubber, plastic, and conventional metals. However, these common materials have limitations in performance, making it difficult to achieve excellent acoustic results. When the vibrating sound generator vibrates, it transmits the vibration to a conducting plate, which then transmits it to the housing through a transmission plate. The transmission plate transmits different amplitudes according to the frequency during vibration. For example, if the housing is made of plastic, the plastic, due to its flexibility, often absorbs some of the vibration energy, leading to reduced vibration transmission efficiency and consequently affecting the intensity and clarity of the sound. Summary of the Invention

[0006] In view of this, the purpose of this application is to overcome the shortcomings of the prior art and provide a bone conduction loudspeaker and bone conduction hearing aid that can reduce energy loss, thereby enhancing the intensity and clarity of sound.

[0007] This application provides a bone conduction loudspeaker, comprising:

[0008] Vibrating sound generator;

[0009] A housing having a receiving groove for accommodating the vibrating sound generator connected to the receiving groove, the housing being made of zirconium oxide material, a portion of the housing being configured to conform to the skin and transmit vibrations generated by the vibrating sound generator to the skin.

[0010] The bone conduction loudspeaker provided in this application has a vibrating sound generator installed in a receiving groove. The housing is made of zirconia material, and a part of the housing is configured to fit in contact with the skin. When the vibrating sound generator vibrates, the housing directly transmits the vibration signal to the skin to transmit the signal to the skull. Because the housing is made of zirconia material, the housing made of zirconia material can transmit these vibrations to the skull more efficiently, reduce energy loss, and thus enhance the intensity and clarity of the sound.

[0011] In an optional embodiment, the receiving groove includes a groove wall and a groove bottom, the groove bottom being part of the inner wall of the housing, and the groove wall being arranged circumferentially around the groove bottom.

[0012] In an optional embodiment, a protrusion is provided on the bottom of the tank. The protrusion and the housing are integrally formed by zirconium oxide material. The protrusion is arranged circumferentially along the bottom of the tank, and the vibrating plate of the vibrating sound generator abuts against the protrusion.

[0013] In an optional embodiment, the protrusion is an annular protrusion.

[0014] In an optional embodiment, the protrusion is a plurality of arc-shaped protrusions, which are spaced apart circumferentially along the bottom of the groove.

[0015] In an optional embodiment, the thickness of the protrusion is d along the depth direction of the receiving groove, satisfying 0.3mm≤d≤0.6mm.

[0016] In an optional embodiment, the vibrating pad is connected to the protrusion by an adhesive. The adhesive has a Shore hardness D of 90-98 after curing. After curing, the adhesive forms an adhesive layer with a thickness H that satisfies 10μm≤H≤50μm and a vibration transmission efficiency ≥90% in the frequency range of 1-10kHz.

[0017] In an optional embodiment, the adhesive comprises the following components:

[0018] Bisphenol A type epoxy resin: 50-70 wt%;

[0019] chopped carbon fiber reinforcement: 15-25 wt%, fiber length 50-200 μm;

[0020] Anhydride curing agents: 15-25wt%.

[0021] In an alternative embodiment, the housing includes a contact surface configured to conform to the skin, the contact surface being disposed on a side opposite to the vibrating sound generator.

[0022] In an optional embodiment, the contact surface is a curved structure, and the radius of curvature r of the curved structure satisfies 50mm≤r≤150mm.

[0023] In an optional embodiment, the contact surface includes a temporal bone contact area and a zygomatic bone contact area. The radius of curvature r1 of the temporal bone contact area satisfies 100mm≤r1≤150mm, and the radius of curvature r2 of the zygomatic bone contact area satisfies 50mm≤r2≤100mm.

[0024] In an optional embodiment, a biomimetic honeycomb micro-arched array is formed on the contact surface, wherein the diameter D of a single honeycomb micro-arched unit satisfies 2mm≤D≤5mm, and the radius of curvature R of a single honeycomb micro-arched unit satisfies 10mm≤R≤30mm.

[0025] In an optional embodiment, the contact surface is provided with an acoustic impedance gradient layer, which includes, in sequence from the direction away from the contact surface, a zirconium oxide substrate layer, a zirconium oxide composite layer, and a silicone layer stacked together.

[0026] In an optional embodiment, the vibrating sound generator is bonded to the wall of the receiving tank with adhesive. The Shore hardness D of the cured adhesive is 80-90. The thickness h of the cured adhesive layer satisfies 50μm≤h≤80μm.

[0027] This application also provides a bone conduction hearing aid, including the bone conduction speaker as described in the foregoing embodiments. The bone conduction hearing aid provided by this application has a bone conduction speaker; therefore, the bone conduction hearing aid possesses all the beneficial effects of the aforementioned bone conduction speaker, namely, reducing energy loss during vibration transmission, thereby enhancing sound intensity and clarity, and improving sound conduction efficiency. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 shows a three-dimensional structural diagram of the bone conduction hearing aid provided in an embodiment of this application;

[0030] Figure 2 shows a one-view exploded structural diagram of the vibration generator provided in an embodiment of this application;

[0031] Figure 3 shows a schematic diagram of the bone conduction loudspeaker provided in an embodiment of this application from one perspective.

[0032] Figure 4 shows a schematic cross-sectional view of the structure along the AA direction as shown in Figure 3;

[0033] Figure 5 shows a schematic diagram of the housing of the bone conduction loudspeaker provided in an embodiment of this application from one perspective;

[0034] Figure 6 shows a schematic cross-sectional view of the structure along the BB direction shown in Figure 5;

[0035] Figure 7 shows a partial structural schematic diagram of the shell shown in Figure 5;

[0036] Figure 8 shows a schematic diagram of the housing of the bone conduction loudspeaker provided in an embodiment of this application from one perspective;

[0037] Figure 9 shows a schematic diagram of the housing of the bone conduction loudspeaker provided in an embodiment of this application from one perspective;

[0038] Figure 10 shows a cross-sectional view of the housing provided in an embodiment of this application.

[0039] Key component symbols: 100-Bone conduction speaker; 110-Vibration generator; 111-Housing shell; 112-Cylindrical magnet; 1121-Protrusion; 113-Vibrating plate; 114-Coil; 120-Housing shell; 121-Receiving groove; 1211-Groove wall; 1212-Groove bottom; 1213-Protrusion; 1214-Gap; 122-Contact surface; 1221-Temporal bone contact area; 1222-Zygomatic bone contact area; 1223-Bionic honeycomb micro-arched array; 130-Adhesive layer; 140-Glue layer; 200-Bone conduction hearing aid; 210-Fixing device. Detailed Implementation

[0040] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0041] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0042] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0043] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0044] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0045] A bone conduction speaker 100 converts signals containing sound information into vibrations to generate sound. The bone conduction speaker 100 transmits sound through the human skeleton to the auditory system, thus producing hearing. Generally, the sound conduction principle of the bone conduction speaker 100 is as follows: the bone conduction speaker 100 can acquire or generate signals containing sound information. Specifically, the vibrating generator 110 in the bone conduction speaker 100 generates vibrations based on the signal. For example, an electrical signal can be directly converted into mechanical vibrations through the vibrating generator 110. These vibrations are transmitted directly to the skull through parts in close contact with the head, such as the temporal bone and mastoid bone. The skull acts as a natural sound transmission medium, rapidly and efficiently transmitting the vibrations to the cochlea in the inner ear. The auditory receptors in the cochlea convert these vibrations into nerve impulses, which are then transmitted to the brain via the auditory nerve, allowing the user to perceive sound. For example, in sound information that includes light signals, the vibrating sound generator 110 can convert light signals into vibration signals; the vibrating sound generator 110 transmits the vibration to the panel or housing of the bone conduction speaker 100 through a conductive element. The generation of vibration is accompanied by energy conversion, and the bone conduction speaker 100 can use a specific vibrating sound generator to convert signals into mechanical vibrations. The energy conversion methods of the vibrating sound generator 110 include, but are not limited to, moving-coil, electrostatic, piezoelectric, moving-iron, and electromagnetic types. For example, in a moving-coil vibrating sound generator, the vibrating plate can be a centrally symmetrical or asymmetrical structure; the vibrating plate 113 can be provided with intermittent perforated structures, allowing the vibrating plate to produce greater displacement, thereby enabling the bone conduction speaker to achieve higher sensitivity and improve the output power of vibration and sound.

[0046] The inventors have discovered that current bone conduction hearing aids still have some performance issues that urgently need to be addressed. Insufficient gain is one of the more prominent problems, which directly results in the sound intensity and clarity failing to meet the needs of some users. Therefore, embodiments of this application provide a bone conduction speaker 100, mainly used in a bone conduction hearing aid 200, to improve the conduction sound effect and meet the needs of some users.

[0047] As shown in Figures 3 and 4, the bone conduction loudspeaker 100 includes a vibrating sound generator 110 and a housing 120.

[0048] Referring to Figure 2, for ease of description of the embodiments of this application, the vibration generator 110, comprising a housing 111, a vibrating plate 113, a cylindrical magnet 112, and a coil 114, will be used as an example. The vibrating plate 113 is symmetrically arranged at both ends of the housing 111. The cylindrical magnet 112 is disposed inside the housing 111 and has a protrusion 1121 connected to the vibrating plate 113. The coil 114 is wound around the cylindrical magnet 112 and configured to drive the cylindrical magnet 112 to vibrate, thereby causing the vibrating plate 113 to vibrate. Of course, for those skilled in the art, the structure of the vibration generator 110 is not limited to this.

[0049] The housing 120 has a receiving groove 121 for accommodating the vibrating sound generator 110, which is connected to the receiving groove 121. The housing 120 is made of zirconium oxide material, and a portion of the housing 120 is configured to fit against the skin and transmit the vibrations generated by the vibrating sound generator 110 to the skin.

[0050] The zirconia material used to make the shell 120 gives it a high density and elastic modulus, which makes the shell 120 exhibit excellent performance in transmitting sound vibrations. Thanks to the unique physical properties of zirconia, it can conduct sound along an ordered path, reducing energy loss caused by grain boundary scattering and defect absorption, and transmitting the vibrations generated by the vibrating sound generator 110 to the skull with almost no loss, greatly improving the sound transmission efficiency.

[0051] The casing 120, made of zirconium oxide, has excellent chemical stability and is not prone to chemical reactions with substances in the external environment. This ensures that the casing 120 remains unaffected by complex environments such as humidity and high temperatures, and maintains stable sound wave transmission performance.

[0052] Furthermore, the low hygroscopicity of the zirconia-coated shell 120 is also a crucial factor in reducing sound wave loss. Moisture absorption alters the acoustic properties of materials, increasing sound wave attenuation. However, the shell 120 absorbs almost no moisture, maintaining the stability of its acoustic properties and further reducing sound wave loss during transmission, thus ensuring clear sound transmission.

[0053] The bone conduction speaker 100 provided in this application embodiment has a vibration generator 110 installed in a receiving groove 121. The housing 120 is made of zirconium oxide material, and a part of the housing 120 is configured to fit in contact with the skin. When the vibration generator 110 vibrates, the housing 120 directly transmits the vibration signal to the skin to transmit the signal to the skull. Since the housing 120 is made of zirconium oxide material, the housing 120 made of zirconium oxide material can transmit these vibrations to the skull more efficiently, reduce energy loss, and thus enhance the intensity and clarity of the sound.

[0054] As shown in Figures 4, 6, and 7, in some embodiments, the receiving groove 121 includes a groove wall 1211 and a groove bottom 1212. The groove bottom 1212 is part of the inner wall of the housing 120, and the groove wall 1211 is arranged circumferentially around the groove bottom 1212. In this embodiment, the vibrating sound generator 110 is installed in the receiving groove 121. The vibration generated by the vibrating sound generator 110 conducts the sound signal through the groove bottom 1212 formed by a part of the housing 120, reducing the energy loss caused by the diaphragm transmitting to the housing 120 in the prior art and improving the sound transmission effect.

[0055] As shown in Figures 4, 6, and 7, in some embodiments, a protrusion 1213 is provided on the bottom of the groove 1212. The protrusion 1213 and the housing 120 are integrally formed from zirconium oxide material. The protrusion 1213 is arranged circumferentially along the bottom of the groove 1212, and the vibrating plate 113 of the vibrating sound generator 110 abuts against the protrusion 1213. In this embodiment, the protrusion 1213 and the housing 120 are integrally formed from zirconium oxide material, which facilitates the direct transmission of the vibration generated by the vibrating plate 113 to the housing 120. At the same time, the protrusion 1213 forms a gap 1214 between the vibrating plate 113 and the inner wall of the housing 120, which facilitates the vibration deformation of the vibrating plate 113.

[0056] As shown in Figure 7, in some embodiments, the protrusion 1213 is an annular protrusion 1121. The annular protrusion 1121 directly abuts against the circular vibrating plate 113, so that it directly transmits the vibration generated by the vibrating plate 113 to the housing 120, which facilitates the transmission of sound.

[0057] In other embodiments, the protrusion 1213 is a plurality of arc-shaped protrusions 1121, which are spaced apart circumferentially along the bottom of the groove 1212.

[0058] Referring again to Figure 7, in the embodiment with the protrusion 1213 described above, the thickness of the protrusion 1213 along the depth direction of the receiving groove 121 is d, satisfying 0.3mm ≤ d ≤ 0.6mm. Further, 0.4mm ≤ d ≤ 0.5mm. In this embodiment, the thickness d of the protrusion 1213 is set within the range of 0.3mm to 0.6mm, avoiding the situation where the transmission efficiency of the sound wave signal is low due to the thickness d of the protrusion 1213 being too large. At the same time, it also prevents the thickness d of the protrusion 1213 from being too small, affecting the vibration deformation of the vibrating plate 113. For example, in this embodiment, the thickness d of the protrusion 1213 is 0.5mm. Of course, in other embodiments, the thickness d of the protrusion 1213 can also be 0.3mm, 0.35mm, 0.4mm, 0.42mm, 0.45mm, 0.53mm, 0.55mm, or 0.6mm.

[0059] As shown in Figure 10, in some embodiments, the vibrating plate 113 is connected to the protrusion 1213 by an adhesive. The Shore hardness D of the cured adhesive is 90-98. After curing, the adhesive forms an adhesive layer 130. The thickness H of the adhesive layer 130 satisfies 10μm≤H≤50μm, and the vibration transmission efficiency in the frequency range of 1-10kHz is ≥90%. Optionally, the Shore hardness D of the cured adhesive is 95-98.

[0060] In this embodiment, an adhesive with a cured Shore hardness D of 90-98 is used to form a robust adhesive layer 130 between the vibrating plate 113 and the zirconia protrusion 1213, ensuring a tight fit between the two. During the bonding process, the adhesive is applied evenly to avoid air bubbles or gaps, ensuring uniform vibration transmission. Simultaneously, the thickness H of the adhesive layer 130 is in the range of 10μm to 50μm, and the vibration transmission efficiency is ≥90% in the frequency range of 1-10kHz. The high-hardness adhesive layer 130 has a high elastic modulus, small deformation, and can quickly transmit vibration waves, reducing energy absorption and ensuring that the acoustic wave phase distortion is ≤1 in the frequency range of 1-5MHz. In this embodiment, for example, the thickness H of the adhesive layer 130 is 20μm. It is understood that, in other embodiments, the thickness H of the adhesive layer 130 may also be 10 μm, 15 μm, 25 μm, 27 μm, 30 μm, 32 μm, 38 μm, 40 μm, 45 μm, or 50 μm.

[0061] In one embodiment, the adhesive layer 130 is formed by UV curing, resulting in a thickness uniformity of ≥95%.

[0062] In the above-described embodiments of the adhesive, the tensile strength of the adhesive is ≥10MPa to prevent the bonding surface between the vibrating plate 113 and the protrusion 1213 from failing during vibration, thereby improving the reliability of the product.

[0063] In some embodiments, the adhesive comprises the following components:

[0064] Bisphenol A type epoxy resin: 50-70 wt%;

[0065] chopped carbon fiber reinforcement: 15-25 wt%, fiber length 50-200 μm;

[0066] Anhydride curing agents: 15-25wt%.

[0067] Example 1

[0068] This embodiment provides an adhesive comprising 50 wt% bisphenol A type epoxy resin, 25 wt% chopped carbon fiber reinforcement material with a fiber length of 50 μm and a diameter of 7 μm, and 25 wt% anhydride-based curing agent (methylhexahydrophthalic anhydride). The preparation method of this adhesive includes:

[0069] (1) Preheat epoxy resin at 60℃ for 10 min, add carbon fiber, and ultrasonically disperse for 15 min (power 300W);

[0070] (2) Cool down to 40℃, add curing agent, and mechanically stir for 10 minutes at a speed of 500 rpm;

[0071] (3) Vacuum degassing (-0.1MPa, 10min), pour into mold;

[0072] (4) Curing process: First stage: 80℃ / 2 hours; Second stage: 150℃ / 4 hours.

[0073] Example 2

[0074] This embodiment provides an adhesive comprising 70 wt% bisphenol A type epoxy resin, 15 wt% chopped carbon fiber reinforcement material with a fiber length of 200 μm and a diameter of 8 μm, and 15 wt% anhydride curing agent (phthalic anhydride). The preparation method of this adhesive includes:

[0075] (1) Preheat epoxy resin at 70℃ for 5 min, add carbon fiber (pre-dispersed in 5% acetone), and shear at high speed (2000 rpm, 5 min);

[0076] (2) Cool down to 50°C, add curing agent, and stir until no layering occurs;

[0077] (3) Vacuum degassing (-0.1MPa, 15min), mold release agent applied;

[0078] (4) Curing process: First stage: 100℃ / 3 hours; Second stage: 180℃ / 3 hours.

[0079] Example 3

[0080] This embodiment provides an adhesive comprising 60 wt% bisphenol A type epoxy resin, 20 wt% chopped carbon fiber reinforcement material with a fiber length of 130 μm and a diameter of 5 μm, and 20 wt% anhydride-based curing agent (tetrahydrophthalic anhydride). The adhesive preparation method includes:

[0081] (1) Epoxy resin and carbon fiber (pretreated with silane coupling agent KH550) were blended and planetarily stirred (500 rpm, 8 min);

[0082] (2) Add curing agent (containing 0.5% benzyl dimethylamine accelerator) and mix with ultrasonic assistance (200W, 10min);

[0083] (3) After vacuum degassing, pour into a preheated mold (60℃);

[0084] (4) Curing process: First stage: 80℃ / 2 hours; Second stage: 120℃ / 3 hours; Third stage: 160℃ / 2 hours.

[0085] Comparative Example 1

[0086] Comparative Example 1 provides an adhesive comprising 70 wt% epoxy resin, 15 wt% carbon fiber with a fiber length of 30 μm and a diameter of 9 μm, and 10 wt% curing agent. The preparation method of this adhesive is the same as that of Example 1.

[0087] Comparative Example 2

[0088] Comparative Example 2 provides an adhesive comprising 40 wt% bisphenol A type epoxy resin, 30 wt% chopped carbon fiber reinforcement material with a fiber length of 220 μm and a diameter of 5 μm, and 30 wt% anhydride curing agent (HHPA). The preparation method of this adhesive is the same as that of Example 2.

[0089] The adhesives prepared in Examples 1, 2, and 3, along with Comparative Examples 1 and 2, were subjected to performance tests. The test results are shown in Table 1.

[0090] Table 1

[0091] As shown in Table 1, the adhesive made by using 50-70 wt% bisphenol A type epoxy resin, 15-25 wt% chopped carbon fiber reinforcement, 50-200 μm fiber length, and 15-25 wt% anhydride curing agent has better hardness, vibration transmission efficiency, and acoustic phase distortion, and can transmit vibration more efficiently.

[0092] As shown in Figures 3 and 5, in some embodiments, the housing 120 includes a contact surface 122 configured to conform to the skin, and the contact surface 122 is disposed on a side opposite to the vibrating sound generator 110. In this embodiment, the contact surface 122 makes contact with the human skin, making it more comfortable for the user to wear and use.

[0093] As shown in Figure 5, in the embodiment of the contact surface 122 described above, the contact surface 122 is a curved surface structure, and the radius of curvature r of the curved surface structure satisfies 50mm≤r≤150mm.

[0094] In this embodiment, the contact surface 122 of the curved structure contacts the skin portion of the skull, allowing it to better conform to the skull contour, increasing the contact area, and thus improving the efficiency of vibration transmission. For example, the radius of curvature r of the curved structure is 50 mm. Of course, in other embodiments, the radius of curvature r of the curved structure satisfies 50 mm ≤ r ≤ 100 mm; for example, the radius of curvature r can also be 55 mm, 60 mm, 70 mm, 75 mm, 80 mm, 88 mm, or 100 mm. Again, for example, the radius of curvature r of the curved structure is 100 mm ≤ r ≤ 150 mm; for example, the radius of curvature r can also be 100 mm, 105 mm, 110 mm, 120 mm, 130 mm, 135 mm, 140 mm, 145 mm, or 150 mm.

[0095] As shown in Figure 9, in the embodiment of the contact surface 122 described above, the contact surface 122 includes a temporal bone contact area 1221 and a zygomatic bone contact area 1222. The radius of curvature r1 of the temporal bone contact area 1221 satisfies 100mm≤r1≤150mm, and the radius of curvature r2 of the zygomatic bone contact area 1222 satisfies 50mm≤r2≤100mm. In this embodiment, the contact surface 122 includes the temporal bone contact area 1221 and the zygomatic bone contact area 1222, so that when the bone conduction speaker 100 is in use, the temporal bone contact area 1221 is in contact with the skin of the temporal bone region of the human body, and the zygomatic bone contact area 1222 is in contact with the skin of the zygomatic bone region of the human body. At the same time, combined with the design of the radius of curvature of the temporal bone contact area 1221 and the zygomatic bone contact area 1222, it can better fit the contour of the human ear, increase the contact area between the product and the human body, and thus improve the efficiency of vibration transmission. For example, in this embodiment, the radius of curvature r1 of the temporal bone contact area 1221 is 120 mm, and the radius of curvature r2 of the zygomatic bone contact area 1222 is 60 mm.

[0096] In some embodiments, optionally, the radius of curvature r1 of the temporal bone contact area 1221 satisfies 120mm ≤ r1 ≤ 130mm, and the radius of curvature r2 of the zygomatic bone contact area 1222 satisfies 70mm ≤ r2 ≤ 90mm. Of course, in other embodiments, the radius of curvature r1 of the temporal bone contact area 1221 can also be 100mm, 105mm, 110mm, 112mm, 115mm, 125mm, 130mm, 135mm, 140mm, 145mm, or 150mm; and the radius of curvature r2 of the zygomatic bone contact area 1222 can also be 50mm, 55mm, 63mm, 70mm, 75mm, 80mm, 85mm, 90mm, 95mm, 98mm, or 100mm.

[0097] In other embodiments, the contact surface 122 is provided with an acoustic impedance gradient layer (not shown in the figure). The acoustic impedance gradient layer comprises, in sequence from the direction away from the contact surface 122, a zirconia substrate layer, a zirconia composite layer, and a silicone layer. The zirconia composite layer is made of zirconia and silicone, and its thickness is 0.2 to 0.5 mm. For example, in this embodiment, the thickness of the zirconia composite layer is 0.2 mm. Of course, in other embodiments, the thickness of the zirconia composite layer can also be 0.3 mm, 0.4 mm, or 0.5 mm. In this embodiment, the acoustic impedance gradient layer optimizes vibration transmission and further improves the sound transmission effect.

[0098] As shown in Figure 8, in some other embodiments, a biomimetic honeycomb micro-arched array 1223 is formed on the contact surface 122. The diameter D of a single honeycomb micro-arched unit satisfies 2mm≤D≤5mm, and the radius of curvature R of a single honeycomb micro-arched unit satisfies 10mm≤R≤30mm.

[0099] In this embodiment, a biomimetic honeycomb micro-arched array 1223 is formed on the contact surface 122, which facilitates the fit with the skin of the ear and improves the wearing comfort.

[0100] For example, the diameter D of a single cellular microarched cell on the contact surface 122 is 3 mm, and the radius of curvature R is 15 mm. Of course, in other embodiments, the diameter D of a single cellular microarched cell can also be 2 mm, 2.5 mm, 3.5 mm, 4 mm, 4.5 mm, or 5 mm, and the radius of curvature R can be 10 mm, 11 mm, 13 mm, 18 mm, 20 mm, 22 mm, 25 mm, 27 mm, 28 mm, or 30 mm.

[0101] In some embodiments, the vibrating sound generator 110 is bonded to the wall 1211 of the receiving groove with adhesive. The Shore hardness D of the cured adhesive is 80-90. The adhesive layer 140 after curing has a thickness h that satisfies 50μm≤h≤80μm. In this embodiment, the sidewall of the vibrating sound generator 110 is bonded to the wall 1211 of the receiving groove 121 with high-hardness adhesive to avoid affecting the vibration transmission of the vibrating sound generator 110. At the same time, the design of the hardness and thickness of the adhesive ensures the tensile strength and shrinkage rate after the adhesive is bonded, thereby improving the connection strength between the vibrating sound generator 110 and the receiving groove.

[0102] In the above embodiments, exemplarily, the adhesive comprises the following components: epoxy resin: 30-60 wt%, selected from at least one of bisphenol A type epoxy resin, bisphenol F type epoxy resin, or hydrogenated bisphenol A epoxy resin; curing agent: 10-30 wt%, selected from amine curing agents, such as polyethylene glycol diamine (PEG-Diamine); other solvents: 10-40 wt%. The volumetric mixing ratio of the adhesive to the curing agent is 2:1, and the weight mixing ratio is 100:46.

[0103] As shown in Figure 1, an embodiment of this application also provides a bone conduction hearing aid 200, including the bone conduction speaker 100 as described in the foregoing embodiments. The bone conduction hearing aid 200 provided in this application has the bone conduction speaker 100 described in the above embodiments. Therefore, the bone conduction hearing aid 200 has all the beneficial effects of the bone conduction speaker 100, namely, reducing energy loss during vibration transmission, thereby enhancing sound intensity and clarity, and improving sound conduction efficiency.

[0104] In some embodiments, the bone conduction hearing aid 200 includes a bone conduction speaker 100 and a fixation device 210. The bone conduction speaker 100 is mounted on the fixation device 210 such that, when in use, the bone conduction speaker 100 is fitted against the auricle of the user's head.

[0105] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0106] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application. Industrial applicability

[0107] This bone conduction speaker has a vibrating sound generator installed within a receiving slot. The housing is made of zirconia material, and a portion of the housing is designed to fit against the skin. When the vibrating sound generator vibrates, the housing directly transmits the vibration signal to the skin, thereby transmitting the signal to the skull. Because the housing is made of zirconia material, it can transmit these vibrations to the skull more efficiently, reducing energy loss and thus enhancing the intensity and clarity of the sound. This bone conduction hearing aid includes the bone conduction speaker as described in the foregoing embodiments. The bone conduction hearing aid provided in the second aspect of this application has the bone conduction speaker provided in the first aspect. Therefore, this bone conduction hearing aid possesses all the beneficial effects of the aforementioned bone conduction speaker, namely, reducing energy loss during vibration transmission, thereby enhancing the intensity and clarity of the sound and improving the conduction effect.

Claims

1. A bone conduction loudspeaker, characterized in that, include: Vibrating sound generator; A housing having a receiving groove for accommodating the vibrating sound generator connected to the receiving groove, the housing being made of zirconium oxide material, a portion of the housing being configured to conform to the skin and transmit vibrations generated by the vibrating sound generator to the skin.

2. The bone conduction loudspeaker according to claim 1, characterized in that, The receiving groove includes a groove wall and a groove bottom, the groove bottom being part of the inner wall of the housing, and the groove wall being arranged circumferentially around the groove bottom.

3. The bone conduction loudspeaker according to claim 2, characterized in that, A protrusion is provided on the bottom of the tank. The protrusion and the housing are integrally formed by zirconium oxide material. The protrusion is arranged circumferentially along the bottom of the tank. The vibrating plate of the vibrating sound generator abuts against the protrusion.

4. The bone conduction loudspeaker according to claim 3, characterized in that, The protrusion is a circular protrusion.

5. The bone conduction loudspeaker according to claim 3, characterized in that, The protrusion consists of multiple arc-shaped protrusions, which are spaced apart circumferentially along the bottom of the groove.

6. The bone conduction loudspeaker according to claim 3, characterized in that, Along the depth direction of the receiving groove, the thickness of the protrusion is d, which satisfies 0.3mm≤d≤0.6mm.

7. The bone conduction loudspeaker according to claim 3, characterized in that, Along the depth direction of the receiving groove, the thickness of the protrusion is d, which satisfies 0.4mm≤d≤0.5mm.

8. The bone conduction loudspeaker according to any one of claims 3 to 7, characterized in that, The vibrating pad is connected to the protrusion by an adhesive. The adhesive has a Shore hardness D of 90-98 after curing. After curing, the adhesive forms an adhesive layer with a thickness H that satisfies 10μm≤H≤50μm and a vibration transmission efficiency ≥90% in the frequency range of 1-10kHz.

9. The bone conduction loudspeaker according to any one of claims 3-7, characterized in that, The adhesive layer is formed by UV curing and has a thickness uniformity of ≥95%.

10. The bone conduction loudspeaker according to any one of claims 3-7, characterized in that, The tensile strength of the adhesive is ≥10MPa.

11. The bone conduction loudspeaker according to claim 7, characterized in that, The adhesive comprises the following components: Bisphenol A type epoxy resin: 50-70 wt%; chopped carbon fiber reinforcement: 15-25 wt%, fiber length 50-200 μm; Anhydride curing agents: 15-25wt%.

12. The bone conduction loudspeaker according to any one of claims 1-8, characterized in that, The housing includes a contact surface configured to conform to the skin, the contact surface being disposed on a side opposite to the vibrating sound generator.

13. The bone conduction loudspeaker according to claim 9, characterized in that, The contact surface is a curved surface structure, and the radius of curvature r of the curved surface structure satisfies 50mm≤r≤150mm.

14. The bone conduction loudspeaker according to any one of claims 9-13, characterized in that, The contact surface includes a temporal bone contact area and a zygomatic bone contact area. The radius of curvature r1 of the temporal bone contact area satisfies 100mm≤r1≤150mm, and the radius of curvature r2 of the zygomatic bone contact area satisfies 50mm≤r2≤100mm.

15. The bone conduction loudspeaker according to any one of claims 9-14, characterized in that, A biomimetic honeycomb micro-arched array is formed on the contact surface. The diameter D of a single honeycomb micro-arched unit satisfies 2mm≤D≤5mm, and the radius of curvature R of a single honeycomb micro-arched unit satisfies 10mm≤R≤30mm.

16. The bone conduction loudspeaker according to any one of claims 9-15, characterized in that, The contact surface is provided with an acoustic impedance gradient layer, which includes, in sequence from the direction away from the contact surface, a zirconium oxide substrate layer, a zirconium oxide composite layer, and a silicone layer.

17. The bone conduction speaker of any one of claims 1-16, wherein, The vibrating sound generator is bonded to the wall of the receiving tank with adhesive. The Shore hardness D of the adhesive after curing is 80-90. The thickness h of the adhesive layer after curing satisfies 50μm≤h≤80μm.

18. A bone conduction hearing aid, characterized in that Includes a bone conduction loudspeaker as described in any one of claims 1 to 17.

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