Bone conduction microphone

Abstract

The utility model provides a bone conduction microphone, which belongs to the technical field of microphones and comprises a first shell and a circuit board, the circuit board is arranged at an opening outside the first shell, and a second cavity is formed between the first shell and the circuit board; comprising a second shell, the second shell is further arranged on the periphery of the first shell, a first cavity is formed among the second shell, a circuit board and the first shell, the vibration assembly is located in the first cavity and comprises at least one cantilever beam, the cantilever beam comprises a supporting piece and a vibration piece, and the supporting piece is located in the first cavity. The vibrating piece is hung on the supporting piece; according to the utility model, the vibration assembly is changed, so that the first cavity can generate large airflow or air pressure change more easily, and the sensitivity is improved; the selection range of the vibration piece to the elastic material is wider, the selection range of the mass block to the size and the weight is wider, and performance optimization is easier to achieve.

Description

TECHNICAL FIELD

[0001] The utility model relates to a bone conduction microphone. BACKGROUND

[0002] As a new type of microphone that only picks up vibration signals, the bone conduction microphone is widely used in TWS earphones to reduce noise and wind noise. The current mature scheme is to use a vibrating diaphragm and a mass block to sense the human skull signal and convert the vibration signal into an electrical signal for output.

[0003] The common scheme is as follows: as shown in the accompanying Figure 1 When the vibration is transmitted to the bone conduction, the internal mass block will drive the vibrating diaphragm to vibrate due to inertia, and the resulting pressure difference between cavity 1 and cavity 2 acts on the MEMS, the MEMS diaphragm vibrates and converts into an electrical signal which is output through ASIC, then a small voltage signal is formed, which is output after ASIC processing, and finally the conversion from the vibration signal to the electrical signal is completed. The main disadvantage of this method is that the cavity 2 space is relatively large, and the air pressure difference acting on the MEMS diaphragm is relatively small, resulting in low sensitivity. At the same time, the process of packaging the mass block inside the metal shell 2 is difficult, and consistency and stability are difficult to guarantee. SUMMARY

[0004] The utility model aims at overcoming the above-mentioned traditional technology's insufficient, provides a kind of bone conduction microphone.

[0005] The utility model aims at overcoming the above-mentioned traditional technology's insufficient, provides a kind of bone conduction microphone.

[0006] As an improvement, the vibrating member includes a fixed end and a suspended end, the fixed end is fixedly connected with the support, and the suspended end is an end away from the fixed end and suspendedly arranged.

[0007] As a further improvement, the vibrating assembly includes a plurality of cantilever beams, and each two of the cantilever beams are oppositely arranged, i.e., the suspended ends of the vibrating members are oppositely arranged.

[0008] As a further improvement, the vibration assembly comprises two cantilever beams, one end of the support is connected with the first shell, and the other end is connected with the second shell, the first shell, the support and the second shell form a third cavity, and the vibration piece is located in the third cavity.

[0009] As a further improvement, the vibration assembly comprises a mass block arranged on the vibration piece.

[0010] As a further improvement, the vibration piece is a thin metal vibration piece.

[0011] As a further improvement, the first shell is a metal shell.

[0012] As a further improvement, the second shell is a metal shell.

[0013] As a further improvement, the first shell is provided with a microphone assembly, and the microphone assembly comprises a MEMS and an ASIC.

[0014] As a further improvement, the first shell comprises an electric connection plate, and the microphone assembly is electrically connected with the circuit board through the electric connection plate.

[0015] Due to the adoption of the above technical scheme, compared with the prior art, the utility model has the advantages of:

[0016] The utility model discloses the change to the vibration assembly, and the first cavity is more easily produced larger air flow or air pressure variation, and this is to improve sensitivity, the vibration piece is more wide to the selection range of elastic material, and the mass block is also more wide to the selection range of size and weight, and more easily realizes the optimization of performance, and the first shell and the second shell double -layer metal shell are arranged, and the anti -interference is more optimal.

[0017] The utility model will be further described below in combination with the drawings and specific embodiment. DRAWINGS

[0018] The prior art structure schematic diagram is shown in the figure. Figure 1

[0019] The embodiment one structure schematic diagram is shown in the figure. Figure 2

[0020] The embodiment two structure schematic diagram is shown in the figure. Figure 3

[0021] The embodiment three structure schematic diagram is shown in the figure. Figure 4 SPECIFIC EMBODIMENT

[0022] ​​​​With reference to the accompanying drawings, the technical solutions in the embodiments of the present application will be clearly and completely described below, obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0023] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0024] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "setting", "connection", "fixing", "threading" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in the present application according to the specific circumstances.

[0025] In addition, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise explicitly specified and limited.

[0026] Embodiment one: as shown in the accompanying Figure 2 A bone conduction microphone, comprising a first shell 1 and a circuit board 2, the first shell 1 is a metal shell, the circuit board 2 is arranged at the opening of the first shell 1, and a second cavity 3 is formed between the first shell 1 and the circuit board 2.

[0027] Further comprising a second shell 4, the second shell 4 is a metal shell, the outer periphery of the first shell 1 is further provided with the second shell 4, and a first cavity 5 is formed between the second shell 4, the circuit board 2 and the first shell 1.

[0028] It also includes a vibration assembly 6, which is located inside the first cavity 5 and disposed on the outside of the first housing 1. The vibration assembly 6 includes a cantilever beam 61, which includes a support member 611 disposed on the first housing 1 and a vibrating member 612 disposed on the support member 611. The vibrating member 612 is a thin metal vibrating member, such as a stainless steel vibrating member. The vibrating member 612 is suspended on the support member 611.

[0029] The vibrating element 612 includes a fixed end and a suspended end. The fixed end is fixedly connected to the support element 611, and the suspended end is the end that is far away from the fixed end and suspended in the air.

[0030] The vibration assembly 6 also includes a mass block 62, which is disposed on the vibrating element 612.

[0031] The first housing 1 includes an electrical connection board 7, and a microphone assembly 8 is disposed on the first housing 1. The microphone assembly 8 includes a MEMS 81 and an ASIC 82. The microphone assembly 8 is electrically connected to the circuit board 2 through the electrical connection board 7.

[0032] In this embodiment, the vibrating element 92 vibrates up and down in a fan-shaped manner during vibration. The addition of the mass block 93 makes the vibration amplitude larger, generating a larger airflow change, which helps to improve sensitivity.

[0033] Example 2: The structure is the same as in Example 1, except as shown in the attached figure. Figure 3 As shown, the vibration assembly 6 includes two cantilever beams 61, with each pair of cantilever beams 61 arranged opposite each other, meaning the suspended ends of the vibrating elements 612 are arranged opposite each other. The distance between the two vibrating elements 612 is such that it does not affect the vibration of the two vibrating elements 612.

[0034] In this embodiment, the vibrating element 612 is changed from one vibrating element 612 to two vibrating elements 612, and the two vibrating elements 612 are symmetrically distributed and vibrate up and down in a fan-shaped manner. The dual vibration further improves the sensitivity.

[0035] Example 3: The structure is the same as in Example 1, except as shown in the attached figure. Figure 4 As shown, the vibration component 6 includes two cantilever beams 61. One end of the support member 611 is connected to the first housing 1, and the other end is connected to the second housing 4. The first housing 1, the support member 611, and the second housing 4 form a third cavity 9, and the vibration member 612 is located in the third cavity 9.

[0036] The third cavity 9 is much smaller than the first cavity 5, and the two vibration members 612 simultaneously vibrate in a fan-shaped manner up and down in the third cavity 9, and the smaller space further improves the sensitivity.

[0037] The above merely describes the preferred embodiments of the present application, and is not intended to limit the present application, and any modification, equivalent replacement and improvement within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A bone conduction microphone comprising a first shell and a circuit board, an opening outside the first shell being provided with the circuit board, a second cavity being formed between the first shell and the circuit board; comprising a second shell, the outer periphery of the first shell being further provided with the second shell, a first cavity being formed between the second shell, the circuit board and the first shell, characterized in that: The vibration assembly is arranged outside the first shell and comprises at least one cantilever beam, the cantilever beam comprises a support arranged on the first shell and a vibration piece arranged on the support, and the vibration piece is arranged in suspension on the support.

2. The bone conduction microphone of claim 1, wherein: The vibration piece comprises a fixed end and a suspended end, the fixed end is fixedly connected with the support, and the suspended end is an end arranged in suspension away from the fixed end.

3. The bone conduction microphone of claim 2, wherein: The vibration assembly comprises a plurality of cantilever beams, and each two of the cantilever beams are arranged oppositely, i.e., the suspended ends of the vibration pieces are arranged oppositely.

4. A microphone according to claim 3, characterised in that: The vibration assembly comprises two cantilever beams, one end of the support is connected with the first shell, and the other end of the support is connected with the second shell, the first shell, the support and the second shell form a third cavity, and the vibration piece is arranged in the third cavity.

5. The bone conduction microphone of any one of claims 1-4, wherein: The vibration assembly comprises a mass block, and the mass block is arranged on the vibration piece.

6. A bone conduction microphone according to any one of claims 1-4, characterized in that: The vibration piece is a thin metal vibration piece.

7. A microphone according to any one of claims 1-4, characterized in that: The first shell is a metal shell.

8. A microphone according to any one of claims 1-4, characterized in that: The second shell is a metal shell.

9. The bone conduction microphone of claim 1, wherein: The first shell is provided with a microphone assembly, and the microphone assembly comprises a MEMS and an ASIC.

10. The bone conduction microphone of claim 9, wherein: The first shell comprises an electric connection plate, and the microphone assembly is electrically connected with the circuit board through the electric connection plate.

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