Piezoelectric vibrator structure of bone conduction earphone and bone conduction earphone

Abstract

The present invention provides a piezoelectric vibrator structure for a bone conduction earphone and the bone conduction earphone, belonging to the technical field of bone conduction sound transmission. It includes a piezoelectric vibrator, one end of the piezoelectric vibrator is connected to a damping structure, and the other end is connected to a mass block. The damping structure includes a clamping block, a microchannel is arranged in the clamping block, flexible accommodating cavities are respectively arranged at both ends of the microchannel, and a non-Newtonian fluid is filled in the accommodating cavity and the microchannel. The accommodating cavity and the microchannel form a U shape and clamp on the piezoelectric vibrator. The advantage of the present invention is that the piezoelectric vibrator can adaptively adjust the resonance frequency under different frequency signals through the non-Newtonian fluid.

Description

Technical Field

[0001] The present invention belongs to the technical field of bone conduction sound transmission, and relates to a bone conduction earphone, in particular to a piezoelectric oscillator structure of a bone conduction earphone and the bone conduction earphone. Background Art

[0002] Sound is converted into mechanical vibrations of different frequencies and transmitted through the human skull, bony labyrinth, endolymph of the inner ear, cochlea, and auditory center. That is, the sound source generates vibrations, which are transmitted to the part of the ear in contact with the earphone, such as the temporal bone, and then conducted through the skull to the inner ear, stimulating the auditory nerve in the inner ear. The auditory nerve converts the vibrations into electrical signals, which are transmitted to the brain through the auditory nerve, and the brain processes them to generate auditory perception.

[0003] The core component of a bone conduction earphone is the vibration unit, which usually uses a piezoelectric ceramic oscillator as the vibration unit of the bone conduction earphone. Utilizing the direct and inverse piezoelectric effects of piezoelectric ceramics, when a driving voltage is applied, it can quickly generate mechanical deformation, thereby causing vibrations, realizing the efficient conversion of electrical signals into mechanical vibrations, and accurately converting audio signals into vibration signals that can be transmitted through the bones. It has the characteristics of many layers and thin thickness, which can improve the bone conduction vibration effect, maintain good sound quality when transmitting low-frequency sound effects, and make the volume, texture of the sound consistent with the original sound quality; the mid-frequency has large resolution, good density, and delicate dynamic presentation; the high-frequency brightness is healthy, straight, open, not sharp, and clean and balanced.

[0004] However, the vibration unit of the piezoelectric ceramic type usually shows a limited vibration frequency range and is relatively difficult to generate high-frequency and low-frequency vibrations. There are certain limitations in the vibration frequency range that can be covered, which may result in the inability to fully present the details and richness of the original audio when restoring some music or sounds with rich high frequencies, affecting the integrity of the sound quality. Summary of the Invention

[0005] The purpose of the present invention is to solve the above problems and provide a piezoelectric oscillator structure for a bone conduction earphone.

[0006] Another purpose of the present invention is to provide a bone conduction earphone for the above piezoelectric oscillator.

[0007] To achieve the above purpose, the present invention adopts the following technical solutions: The piezoelectric oscillator structure of this bone conduction earphone includes a piezoelectric oscillator. One end of the piezoelectric oscillator is connected to a damping structure, and the other end is connected to a mass block. The damping structure includes a clamping block, a microchannel is provided in the clamping block, flexible accommodation cavities are respectively provided at both ends of the microchannel, and a non-Newtonian fluid is filled in the accommodation cavity and the microchannel. The accommodation cavity and the microchannel form a U shape and clamp on the piezoelectric oscillator.

[0008] In the above piezoelectric vibrator structure of the bone conduction earphone, the non-Newtonian fluid flows in the microchannel, which is a shear thickening fluid, and its rheological properties change with the vibration frequency.

[0009] In the above piezoelectric vibrator structure of the bone conduction earphone, the microchannel forms a damping channel. When the piezoelectric vibrator vibrates, the accommodating cavities at both ends of the microchannel squeeze the accommodating cavities to make the non-Newtonian fluid have a tendency to flow in the microchannel.

[0010] In the above piezoelectric vibrator structure of the bone conduction earphone, at low-frequency vibration, the non-Newtonian fluid is in a fluid state and passes through the microchannel. The resistance at the clamping position of the piezoelectric vibrator is small, the resonant frequency of the piezoelectric vibrator is small, and the resistance increases with the increase of the frequency. At medium-frequency vibration, the non-Newtonian fluid is in a fluid-solid coupling state and passes through the microchannel. The resistance at the clamping position of the piezoelectric vibrator is large, the resonant frequency of the piezoelectric vibrator is moderate, and the resistance increases with the increase of the frequency. At high-frequency vibration, the non-Newtonian fluid is in a solid state and cannot pass through the microchannel. The resistance at the clamping position of the piezoelectric vibrator is large, the resonant frequency of the piezoelectric vibrator is large, and the resistance increases with the increase of the frequency.

[0011] In the above piezoelectric vibrator structure of the bone conduction earphone, the clamping block includes a clamping body, the clamping body is concave-shaped, one end of the piezoelectric vibrator away from the mass block is arranged in the concave part of the clamping body, and the microchannel is arranged along the clamping body and surrounds the end of the piezoelectric vibrator in a U shape.

[0012] In the above piezoelectric vibrator structure of the bone conduction earphone, the clamping block is fixedly connected to the housing covering the piezoelectric vibrator.

[0013] In the above piezoelectric vibrator structure of the bone conduction earphone, two elastic blocks are arranged on the inner side of the concave part of the clamping body, the accommodating cavity is arranged in the elastic blocks, and the two elastic blocks are respectively arranged on both sides in the vibration direction of the piezoelectric vibrator and are clamped by the U-shaped side walls of the clamping body.

[0014] In the above piezoelectric vibrator structure of the bone conduction earphone, the elastic blocks are made of silica gel. The elastic blocks are provided with open accommodating cavities near the concave bottom of the clamping body. The accommodating cavities are in sealing contact with the concave bottom of the clamping body. Both ends of the microchannel are connected to the openings of the accommodating cavities and communicate with the two accommodating cavities. The clamping body includes a first body and a second body. The first body and the second body are in a 7-shaped and symmetrically arranged and spliced into a concave shape. The microchannels are respectively arranged in the first body and the second body in a 7-shaped and spliced into a U shape.

[0015] In the above piezoelectric vibrator structure of the bone conduction earphone, the piezoelectric vibrator includes a substrate, piezoelectric sheets are arranged on both sides of the substrate, and one end of the substrate away from the clamping block is fixedly connected to a mass block.

[0016] The bone conduction earphone adopting the above piezoelectric vibrator structure of the bone conduction earphone is provided with the above bone conduction piezoelectric vibrator structure in a bone speaker.

[0017] Compared with the existing technology, the advantages of the present invention are as follows: The piezoelectric vibrator adaptively adjusts the resonance frequency under different frequency signals through non-Newtonian fluid, making the low-frequency sound full and rich in layers, extremely precise in restoring the mid-frequency human voice and the fundamental tones of most musical instruments, with a round and full sound, and effectively suppressing the risk of out-of-control of the piezoelectric vibrator under high-frequency small-amplitude rapid vibration, ensuring that high-frequency details such as the high-pitched string music of a violin and the chirping of birds are presented delicately and crisply. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic diagram of the bone conduction earphone provided by the present invention.

[0019] Figure 2 is a schematic diagram of the piezoelectric vibrator structure provided by the present invention.

[0020] Figure 3 is a schematic diagram of the accommodation cavity and microchannel structure provided by the present invention.

[0021] Figure 4 is a cross-sectional view of the piezoelectric vibrator provided by the present invention.

[0022] In the figure, piezoelectric vibrator 1, damping structure 2, mass block 3, clamping block 4, microchannel 5, accommodation cavity 6, non-Newtonian fluid 7, clamping body 8, housing 9, elastic block 10, piezoelectric sheet 11, substrate 12. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The present invention will be further described in detail below with reference to the drawings and specific embodiments.

[0024] As Figures 1 - 3 shown, the piezoelectric vibrator structure of the present bone conduction earphone includes a piezoelectric vibrator 1. One end of the piezoelectric vibrator 1 is connected to a damping structure 2, and the other end is connected to a mass block 3. The damping structure 2 includes a clamping block 4. A microchannel 5 is arranged in the clamping block 4. Flexible accommodation cavities 6 are respectively arranged at both ends of the microchannel 5. And a non-Newtonian fluid 7 is filled in the accommodation cavities 6 and the microchannel 5. The accommodation cavities 6 and the microchannel 5 form a U shape and clamp on the piezoelectric vibrator 1. The U-shaped clamping ensures the full-wrap of the piezoelectric vibrator 1 with uniform force, effectively avoiding damage to the piezoelectric vibrator caused by local stress concentration.

[0025] When the piezoelectric oscillator 1 receives the input electrical signal, the piezoelectric oscillator 1 vibrates with different amplitudes and frequencies due to receiving signals of different frequencies. After passing through the flexible accommodating cavity 6, it is conducted to the non-Newtonian fluid 7. As a result, the non-Newtonian fluid 7 exhibits different states, causing the clamping block 4 to have different clamping forces, and finally achieving the effect of changing the resonant frequency of the piezoelectric oscillator, so that the bone conduction headset can obtain good sound quality in the low-frequency band and the high-frequency band.

[0026] In this embodiment, the accommodating cavity 6 is flexible. When the non-Newtonian fluid 7 is a fluid, the accommodating cavity 6 is easily deformed by the vibrating piezoelectric oscillator 1, that is, the vibration damping of the piezoelectric oscillator 1 is small. When the non-Newtonian fluid 7 is a solid, the accommodating cavity 6 is supported by the non-Newtonian fluid 7 and is difficult to be deformed by the vibrating piezoelectric oscillator 1, that is, the vibration damping of the piezoelectric oscillator 1 is large.

[0027] For example, in the low-frequency band, due to the lack of damping that can be flexibly adjusted according to low-frequency vibrations, the piezoelectric oscillator 1 is prone to excessive vibration. This is because there is no appropriate resistance to suppress its amplitude, so that the low-frequency response may have a "booming" feeling, that is, the low-frequency sound is turbid and unclear, and it is impossible to accurately restore low-frequency sound effects such as deep drum sounds and bass sounds, resulting in the lack of music hierarchy.

[0028] In the middle-frequency part, without the non-Newtonian fluid changing the damping in a timely manner as the frequency increases, it is difficult for the piezoelectric oscillator to stabilize at the resonant frequency suitable for the middle frequency. There may be a shift in the resonant frequency, resulting in distortion of the restoration of middle-frequency human voices and the fundamental tones of most musical instruments. The middle-frequency sound heard by the user will become dry and lack fullness, affecting the conveyance of musical emotions and the clarity of voice calls.

[0029] The problem is even more prominent in the high-frequency band. Without a mechanism that can rapidly increase the damping at high frequencies, the piezoelectric oscillator is extremely prone to getting out of control due to the rapid vibration with high frequency and small amplitude. This will cause high-frequency cracking phenomena, and high-frequency details such as the high-pitched strings of a violin and bird calls cannot be presented delicately, and even sharp and harsh noises will be generated, giving the user a very poor auditory experience.

[0030] Preferably, the non-Newtonian fluid 7 flows in the microchannel 5 and is a shear thickening fluid, and its rheological properties change from a fluid to a solid as the vibration frequency increases. It enables the damping structure to have the ability of automatic adjustment at different vibration frequencies of the piezoelectric oscillator 1. At low-frequency vibrations, the fluid viscosity is low, allowing the piezoelectric oscillator to vibrate relatively freely to restore rich low-frequency sound effects; as the frequency increases, the viscosity increases, timely suppressing excessive vibrations and accurately matching the requirements of middle-frequency and high-frequency audio. This adaptive change enables the headset to achieve excellent frequency response in the full frequency band, and whether it is exciting rock music or melodious classical music, it can be presented in its original flavor.

[0031] Furthermore, the microchannel 5 forms a damping channel. When the piezoelectric oscillator 1 vibrates, the accommodating cavities 6 at both ends of the microchannel 5 squeeze the accommodating cavities 6, causing the non-Newtonian fluid 7 to have a tendency to flow in the microchannel 5. When the piezoelectric oscillator 1 vibrates, the squeezing action of the accommodating cavity 6 is closely linked to the vibration of the piezoelectric oscillator, realizing the instant drive of the flow of the non-Newtonian fluid 7. This dynamic process ensures the timeliness and accuracy of damping adjustment, enabling the piezoelectric oscillator 1 to obtain just the right damping support at every moment, maintaining stable resonance, avoiding audio distortion, and making the sound output smooth and natural.

[0032] During low-frequency vibration, the non-Newtonian fluid 7 is in a fluid state and flows through the microchannel 5. The resistance at the clamping position of the piezoelectric oscillator 1 is relatively small, the resonance frequency of the piezoelectric oscillator 1 is relatively small, and the resistance increases with the increase in frequency. During medium-frequency vibration, the non-Newtonian fluid 7 is in a fluid-solid coupling state and flows through the microchannel 5. The resistance at the clamping position of the piezoelectric oscillator 1 is relatively large, the resonance frequency of the piezoelectric oscillator 1 is moderate, and the resistance increases with the increase in frequency. During high-frequency vibration, the non-Newtonian fluid 7 is in a solid state and cannot flow through the microchannel 5. The resistance at the clamping position of the piezoelectric oscillator 1 is large, the resonance frequency of the piezoelectric oscillator 1 is large, and the resistance increases with the increase in frequency. This fluid state and damping effect that change dynamically according to frequency perfectly achieve the precise adaptation to audio of different frequency bands. The low-frequency band ensures deep and full sound effects, the middle-frequency band restores mellow human voices and the fundamental tones of musical instruments, the high-frequency band eliminates crackling sounds and presents delicate details, and the whole frequency band works together to create an immersive audio experience for users as if they were on the scene.

[0033] In the low-frequency band, when the audio signal is in a relatively low frequency range, such as 20Hz - 200Hz, the non-Newtonian fluid 7 exhibits a relatively low viscosity. As a shear thickening fluid, it can intelligently adjust the damping according to the low-frequency vibration amplitude and frequency. At this time, during the vibration of the piezoelectric oscillator 1, the non-Newtonian fluid flows relatively smoothly in the microchannel, making the resistance at the clamping position appropriate, neither overly suppressing the vibration of the piezoelectric oscillator nor effectively avoiding its excessive oscillation. This enables the earphone to accurately restore low-frequency sound effects such as deep drumbeats and bass sounds, making the low-frequency sounds full and rich in layers, and allowing users to feel the strong low-frequency shock as if they were on the scene.

[0034] Entering the middle-frequency range, approximately 200Hz - 2000Hz, as the frequency increases, the rheological properties of the non-Newtonian fluid 7 change and gradually transform into a fluid-solid coupling state. This state change appropriately increases the damping of the piezoelectric oscillator, stabilizing it at the resonance frequency suitable for the middle frequency. In this way, the restoration of middle-frequency human voices and the fundamental tones of most musical instruments is extremely accurate, and the sound is mellow and full. Whether it is the emotional transmission of the singer's voice when enjoying music or the clear presentation of the other party's voice during a voice call, it can be excellently guaranteed.

[0035] In the high-frequency band, that is, at frequencies above 2000 Hz, the non-Newtonian fluid 7 is nearly in a solid state under high-frequency vibration, greatly increasing the resistance at the clamping position of the piezoelectric oscillator. This characteristic effectively suppresses the risk of the piezoelectric oscillator getting out of control under high-frequency small-amplitude rapid vibration, ensuring that high-frequency details such as the high-pitched strings of a violin and bird calls are presented delicately and crisply, eliminating high-frequency cracking phenomena, and bringing rich and clear high-frequency auditory enjoyment to users.

[0036] The non-Newtonian fluid can play a buffering and balancing role by virtue of its own characteristics. On the one hand, it absorbs part of the impact force, preventing the external force from directly impacting the piezoelectric oscillator and preventing it from displacing or loosening; on the other hand, even if the piezoelectric oscillator is subjected to a certain disturbance, the dynamic adjustment of the non-Newtonian fluid can prompt it to quickly return to the stable vibration state, ensuring that it always maintains a good contact state with the clamping block. This not only ensures the stability of audio signal transmission, allowing the sound to be continuously and smoothly output, but also significantly reduces component wear, greatly extends the service life of the earphone, and enables the earphone to operate reliably in various dynamic scenarios.

[0037] Preferably, the clamping block 4 includes a clamping body 8, the clamping body 8 is in a concave shape, one end of the piezoelectric oscillator 1 away from the mass block 3 is arranged in the concave part of the clamping body 8, and the microchannel 5 is arranged along the clamping body 8 and surrounds the end of the piezoelectric oscillator 1 in a U shape. The concave-shaped clamping body 8 provides a stable installation base for the piezoelectric oscillator 1, ensuring its stable position during vibration and not being easily displaced or shaken. The U-shaped surrounding microchannel 5 not only makes full use of the space but also ensures uniform damping control of the end of the piezoelectric oscillator 1, optimizes the vibration energy transfer, improves the audio conversion efficiency, and makes the earphone emit sound more efficiently and stably.

[0038] Furthermore, the clamping block 4 is fixedly connected to the housing 9 covering the outside of the piezoelectric oscillator 1. The damping structure 2 is closely combined with the housing 9, making it difficult for external interference forces to penetrate into the core vibration area where the piezoelectric oscillator 1 is located, effectively shielding the adverse effects of external vibrations, collisions, etc., ensuring that the piezoelectric oscillator 1 vibrates stably at a predetermined frequency, and ensuring the purity and stability of the audio output.

[0039] Two elastic blocks 10 are arranged on the inner side of the concave part of the clamping body 8, the accommodating cavity 6 is arranged in the elastic blocks 10, and the two elastic blocks 10 are respectively arranged on both sides in the vibration direction of the piezoelectric oscillator 1 and are clamped by the U-shaped side walls of the clamping body 8. The addition of the elastic blocks 10 adds more flexible buffering to the structure. On the one hand, it protects the accommodating cavity 6 from being damaged by excessive extrusion, ensuring the stable storage and flow of the non-Newtonian fluid 7; on the other hand, when the piezoelectric oscillator 1 vibrates, the elastic blocks 10 can absorb part of the lateral impact force, preventing the piezoelectric oscillator 1 from shifting or being damaged due to uneven lateral force, and ensuring the stability and continuity of audio transmission.

[0040] Preferably, the elastic block 10 is made of silica gel. An accommodating cavity 6 with an opening is provided at the concave bottom of the elastic block 10 close to the clamping body 8. The accommodating cavity 6 is in sealing contact with the concave bottom of the clamping body 8. Both ends of the microchannel 5 are connected to the opening of the accommodating cavity 6 and communicate with the two accommodating cavities 6. The clamping body 8 includes a first body and a second body. The first body and the second body are in a shape of "7" and are symmetrically arranged and spliced into a concave shape. The microchannel 5 is separately arranged in the first body and the second body in a shape of "7" and spliced into a U shape. The elastic block 10 made of silica gel has many advantages such as high elasticity, anti-aging, and good biocompatibility, ensuring long-term stable use. The unique sealing structure design effectively prevents the leakage of the non-Newtonian fluid 7 and ensures the reliable operation of the damping system. The design of the clamping body 8 spliced in a shape of "7" and the microchannel 5 is not only convenient for manufacturing and assembly, but also optimizes the space utilization and force distribution, improving the mechanical properties of the overall structure and laying a solid foundation for the high-performance operation of the earphone.

[0041] Preferably, the piezoelectric vibrator 1 includes a substrate 12, piezoelectric sheets are arranged on both sides of the substrate 12, and one end of the substrate 12 away from the clamping block 4 is fixedly connected to the mass block 3. The layered structure design optimizes the function realization of the piezoelectric vibrator 1. The piezoelectric sheets 11 on both sides serve as vibration excitation sources, which can efficiently convert electrical signals into mechanical vibrations. The substrate 12 plays a role of support and conduction, uniformly transmitting the vibrations to the entire structure. The fixed connection with the mass block 3 further optimizes the resonance characteristics. Cooperating with the damping structure 2, it realizes the precise conversion and output of audio signals, bringing high-quality auditory enjoyment to users.

[0042] The bone conduction earphone adopting the piezoelectric vibrator structure of the upper bone conduction earphone has the bone conduction piezoelectric vibrator structure arranged in the bone speaker.

[0043] The bone conduction earphone constructed based on the above exquisite structure integrates all the structural advantages. The piezoelectric vibrator structure is precisely arranged in the bone speaker, giving full play to its advantages such as precise frequency response, stable structure, and strong environmental adaptability, creating a bone conduction earphone for users that can provide excellent audio experience in various scenarios. Whether it is for sports and fitness, outdoor travel or daily office work, users can enjoy clear, stable and high-quality sound.

[0044] The specific embodiments described in this article are only illustrative of the spirit of the present invention. Those skilled in the technical field to which the present invention belongs can make various modifications or supplements to the described specific embodiments or use similar methods to replace them, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0045] Although terms such as piezoelectric vibrator 1, damping structure 2, mass block 3, clamping block 4, microchannel 5, accommodating cavity 6, non-Newtonian fluid 7, clamping body 8, housing 9, elastic block 10, piezoelectric sheet 11, and substrate 12 are used more frequently in this article, the possibility of using other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitation is contrary to the spirit of the present invention.

Claims

1. A piezoelectric vibrator structure for a bone conduction earphone, characterized in that: The invention comprises a piezoelectric vibrator (1), wherein one end of the piezoelectric vibrator (1) is connected to a damping structure (2), and the other end is connected to a mass block (3); the damping structure (2) comprises a clamping block (4); a microchannel (5) is arranged in the clamping block (4); flexible accommodating cavities (6) are arranged at both ends of the microchannel (5); and the accommodating cavities (6) and the microchannel (5) are filled with a non-Newtonian fluid (7); the accommodating cavities (6) and the microchannel (5) form a U-shaped clamp on the piezoelectric vibrator (1); the microchannel (5) forms a damping channel; when the piezoelectric vibrator (1) vibrates, the accommodating cavities (6) at both ends of the microchannel (5) squeeze the accommodating cavities (6) so that the non-Newtonian fluid (7) has a tendency to flow in the microchannel (5); During low-frequency vibration, the non-Newtonian fluid (7) is in a fluid state and passes through the microchannel (5), the resistance at the clamping point of the piezoelectric vibrator (1) is small, the resonant frequency of the piezoelectric vibrator (1) is small, and the resistance increases with increasing frequency; during medium-frequency vibration, the non-Newtonian fluid (7) is in a fluid-solid coupling state and passes through the microchannel (5), the resistance at the clamping point of the piezoelectric vibrator (1) is large, the resonant frequency of the piezoelectric vibrator (1) is moderate, and the resistance increases with increasing frequency; during high-frequency vibration, the non-Newtonian fluid (7) is in a solid state and cannot pass through the microchannel (5), the resistance at the clamping point of the piezoelectric vibrator (1) is large, the resonant frequency of the piezoelectric vibrator (1) is large, and the resistance increases with increasing frequency.

2. The piezoelectric vibrator structure of the bone conduction earphone according to claim 1, characterized in that: The non-Newtonian fluid (7) flows in the microchannel (5) and is a shear-thickening fluid whose rheological properties change with the vibration frequency.

3. The piezoelectric vibrator structure of the bone conduction earphone according to claim 2, characterized in that: The clamping block (4) comprises a clamping body (8), the clamping body (8) is in a concave shape, the end of the piezoelectric vibrator (1) away from the mass block (3) is arranged in a concave portion of the clamping body (8), and the microchannel (5) is arranged along the clamping body (8) and surrounds the end of the piezoelectric vibrator (1) in a U shape.

4. The piezoelectric vibrator structure of the bone conduction earphone according to claim 3, characterized in that: The clamping block (4) is fixedly connected to a housing (9) enclosing the outside of the piezoelectric vibrator (1).

5. The piezoelectric vibrator structure of the bone conduction earphone according to claim 4, characterized in that: Two elastic blocks (10) are arranged inside the recess of the clamping body (8), the accommodating cavity (6) is arranged in the elastic block (10), and the two elastic blocks (10) are respectively arranged on both sides of the vibration direction of the piezoelectric vibrator (1) and are clamped by the U-shaped side wall of the clamping body (8).

6. The piezoelectric vibrator structure of the bone conduction earphone according to claim 5, characterized in that: The elastic block (10) is made of silicone. The elastic block (10) is provided with an open accommodating cavity (6) near the concave bottom of the clamping body (8). The accommodating cavity (6) and the concave bottom of the clamping body (8) are fitted to form a sealed state. Both ends of the microchannel (5) are connected to the openings of the accommodating cavity (6) and communicate with the two accommodating cavities (6). The clamping body (8) includes a first body and a second body. The first body and the second body are in a 7-shape and are symmetrically arranged and spliced ​​into a concave shape. The microchannel (5) is arranged in the first body and the second body in a 7-shape and spliced ​​into a U-shape.

7. The piezoelectric vibrator structure of the bone conduction earphone according to claim 6, characterized in that: The piezoelectric vibrator (1) comprises a substrate (12), piezoelectric sheets (11) are arranged on both sides of the substrate (12), and one end of the substrate (12) away from the clamping block (4) is fixedly connected to the mass block (3).

8. A bone conduction earphone using the bone conduction earphone piezoelectric vibrator structure according to any one of claims 1 to 7, characterized in that: The bone conduction earphone piezoelectric vibrator structure is arranged in the bone speaker.

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