A single-housing bone conduction MEMS microphone structure

Abstract

The utility model discloses a single shell bone conduction MEMS microphone structure belongs to bone conduction MEMS microphone technical field. A single shell bone conduction MEMS microphone structure, including shell and PCB, the shell is installed at the top of PCB, and the bottom of PCB is provided with PAD, the outer surface of PCB is provided with MEMS, one side of MEMS is provided with ASIC, wherein, ASIC is connected with MEMS and PCB through gold wire respectively. To solve the existing bone conduction MEMS microphone when receiving the broadcast is susceptible to external air pressure, thereby appearing the problem of resonance peak, and the diaphragm appears the tailing effect, finally leads the problem of voice fuzzy, the inner air vent solves the static pressure balance problem, protects the diaphragm and guarantees long -term stability, and the design of the air vent of extending to the support ring and mass block gap, through the accurate control of air release, can optimize the low frequency response, and suppress unnecessary resonance peak.

Description

Technical Field

[0001] This utility model relates to the field of bone conduction MEMS microphone technology, specifically a single-shell bone conduction MEMS microphone structure. Background Technology

[0002] Existing bone conduction MEMS microphones are easily affected by external air pressure when recording sound, resulting in resonance peaks and diaphragm tailing effects, ultimately leading to blurred speech. Utility Model Content

[0003] The purpose of this invention is to provide a single-shell bone conduction MEMS microphone structure. The internal vent hole solves the static pressure balance problem, protects the diaphragm and ensures long-term stability. The external vent hole extends to the gap between the support ring and the mass block. By precisely controlling the venting, the low-frequency response can be optimized and unnecessary resonance peaks can be suppressed, thus solving the problems in the prior art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a single-shell bone conduction MEMS microphone structure, including a shell and a PCB, wherein the shell is mounted on top of the PCB, a PAD is provided at the bottom of the PCB, a MEMS is provided on the outer surface of the PCB, and an ASIC is provided on one side of the MEMS, wherein the ASIC is connected to the MEMS and the PCB respectively through gold wires.

[0005] Preferably, a support ring is provided on the inner side of the outer shell, and the support ring fits into the outer shell.

[0006] Preferably, a mass block is provided inside the support ring, a diaphragm is provided on the inner surface of the mass block, and an internal vent hole is provided on the outer surface of the diaphragm.

[0007] Preferably, the outer surface of the outer shell is provided with an external vent hole, which extends between the support ring and the mass block.

[0008] Compared with the prior art, the beneficial effects of this utility model are:

[0009] 1. This utility model adopts a single-shell design, integrating the shell, support ring, mass block, diaphragm, MEMS, and ASIC into a compact shell, which is directly mounted on the PCB. This simplifies the assembly process, reduces the number of parts and potential assembly error points, and has a simple and direct structure, which is conducive to miniaturization and meets the extremely demanding space requirements of wearable devices.

[0010] 2. This utility model features an internal vent hole that solves the static pressure balance problem, protects the diaphragm, and ensures long-term stability. The external vent hole extends to the gap between the support ring and the mass block. By precisely controlling the venting, the low-frequency response can be optimized, unnecessary resonance peaks can be suppressed, and the optimized damping reduces the trailing effect of the diaphragm movement, resulting in better transient response, clearer voice, rapid dissipation of external pressure disturbances, and significant reduction of the impact of wind noise and mechanical shock on the audio signal, thus improving the user experience in mobile or outdoor environments. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall internal structure of this utility model.

[0012] In the diagram: 1. Outer shell; 2. PCB; 3. Support ring; 4. MEMS; 5. ASIC; 6. Gold wire; 7. PAD; 101. External vent; 301. Mass block; 302. Internal vent; 303. Diaphragm. Detailed Implementation

[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0014] To address the issue that existing bone conduction MEMS microphones are easily affected by external air pressure during sound pickup, resulting in resonant peaks and diaphragm tailing effects that ultimately lead to unclear speech; please refer to... Figure 1 The present invention provides the following solution:

[0015] A single-shell bone conduction MEMS microphone structure includes a shell 1 and a PCB 2. The shell 1 is mounted on top of the PCB 2. A PAD 7 is provided on the bottom of the PCB 2. A MEMS 4 is provided on the outer surface of the PCB 2. An ASIC 5 is provided on one side of the MEMS 4. The ASIC 5 is connected to the MEMS 4 and the PCB 2 respectively through gold wires 6.

[0016] In this embodiment, when a specific surface of the microphone housing 1 is typically designed to be in close contact with the skin or bone, and is subjected to sound wave vibrations transmitted by human bones or tissues, the housing 1 itself will generate corresponding mechanical vibrations. These vibrations are efficiently transmitted to the internal structure of the microphone through the support ring 3 that is tightly fitted to the inside of the housing 1.

[0017] A support ring 3 is provided on the inner side of the outer shell 1. The support ring 3 fits into the outer shell 1. A mass block 301 is provided inside the support ring 3. A diaphragm 303 is provided on the inner surface of the mass block 301. An inner vent hole 302 is provided on the outer surface of the diaphragm 303. An outer vent hole 101 is provided on the outer surface of the outer shell 1. The outer vent hole 101 extends between the support ring 3 and the mass block 301.

[0018] In this embodiment, the mass block 301 inside the support ring 3 is a key inertial element. When the support ring 3 vibrates with the outer shell 1, it drives the mass block 301 to move together. However, the diaphragm 303 suspended on the inner surface of the mass block 301 has different inertial responses due to its relatively thin and flexible characteristics. When the mass block 301 accelerates in the vibration direction, the diaphragm 303 will hysteresis relative to the mass block 301 body due to its inertia. This relative motion between the mass block 301 and the diaphragm 303 causes the diaphragm 303 to deform.

[0019] An internal vent 302 is located on the diaphragm 303. Its main function is to balance the static air pressure on both sides of the diaphragm. Without this vent, the expansion / contraction of the gas inside the cavity caused by changes in atmospheric pressure or temperature would generate huge static pressure on the diaphragm, which could damage the fragile diaphragm or cause sensitivity drift, or even failure. The internal vent allows gas to flow slowly through the diaphragm, maintaining a long-term pressure balance on both sides.

[0020] The external vent 101 and air passage are located on the outer shell 1 and extend to the gap between the support ring 3 and the mass block 301. When the microphone is working, the movement of the diaphragm 303 and the movement of the mass block 301 in the limited space will compress or expand the air around them. After sensing the vibration signal, the mass block 301 will move up and down. The space of the two cavities changes with the vibration. The internal airflow passes through the internal vent 302. The force generated by the movement of the mass block 301 acts on the surface of 4. MEMS4 generates a signal output to ASIC5. ASIC5 amplifies the signal and outputs an electrical signal to the external PAD7. The external vent 101 and its path to the gap, together with the internal vent 302, constitute a controllable acoustic impedance and capacitance network. By carefully designing the size, number and path length of the vent, the resistance of airflow can be precisely controlled, thereby adjusting the low-frequency cutoff frequency of the microphone, suppressing resonance peaks, optimizing the overall frequency response curve, making it more in line with the needs of bone conduction audio bands, and improving sound clarity.

[0021] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0022] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A single-shell bone conduction MEMS microphone structure, characterized in that, The device includes a housing (1) and a PCB (2). The housing (1) is mounted on top of the PCB (2). A PAD (7) is provided on the bottom of the PCB (2). A MEMS (4) is provided on the outer surface of the PCB (2). An ASIC (5) is provided on one side of the MEMS (4). The ASIC (5) is connected to the MEMS (4) and the PCB (2) respectively through gold wires (6).

2. The single-shell bone conduction MEMS microphone structure according to claim 1, characterized in that: A support ring (3) is provided on the inner side of the outer shell (1), and the support ring (3) is in contact with the outer shell (1).

3. The single-shell bone conduction MEMS microphone structure according to claim 2, characterized in that: The support ring (3) has a mass block (301) inside, a diaphragm (303) on the inner surface of the mass block (301), and an inner vent hole (302) on the outer surface of the diaphragm (303).

4. The single-shell bone conduction MEMS microphone structure according to claim 3, characterized in that: The outer surface of the outer shell (1) is provided with an external vent hole (101), which extends between the support ring (3) and the mass block (301).

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