WO2021128351A1

WO2021128351A1 - Bone conduction pickup

Info

Publication number: WO2021128351A1
Application number: PCT/CN2019/129453
Authority: WO
Inventors: 张金宇
Original assignee: 瑞声声学科技(深圳)有限公司
Priority date: 2019-12-27
Filing date: 2019-12-27
Publication date: 2021-07-01

Abstract

Provided by the present utility model is a bone conduction pickup, comprising in turn from the outside to the inside of the pickup: a housing; a microphone arranged corresponding to a through hole on the housing; and a circuit board electrically connected to the housing. The pickup further comprises an elastic pressure member that extends into the through hole, is nested with the microphone and is fixed to the housing; the top of the elastic pressure member is a pressure part. An airtight cavity is formed between one surface, close to the circuit board, of the pressure part and the top surface of the microphone. The pressure part of the elastic pressure member is subjected to vibration, squeezing, and deformation, causing a pressure change in the airtight cavity. The microphone can restore the pressure change to an acoustic signal, and thus a bone conduction pickup having a low cost, a small volume and excellent frequency characteristics is obtained, and the method can be fully compatible with the existing MEMS microphone process.

Description

Bone conduction pickup

Technical field

The utility model relates to the technical field of bone conduction, in particular to a bone conduction pickup.

Background technique

As we all know, the basic principle of bone conduction pickup is to collect the mechanical vibration of the bone protrusion and restore the vibration signal to sound signal output. However, at present, bone conduction pickup devices are divided into vibration pickup microphones that induce vibration acceleration and contact bone conduction microphones that collect pressure changes at contact points. The former bone conduction pickup devices are small in size and do not need to be in contact with the human body, but have poor frequency response characteristics. There is a lot of loss of voice information, and the cost of using an acceleration sensor is high. The microphone compatible solution has patent restrictions, which is inconvenient for people to use; the latter has better frequency characteristics, but most of them are piezoelectric and larger (generally more than 10mm in diameter) , And the cost is high, it is mostly used in special occasions such as military use, and is rarely used in civil electronic equipment.

Therefore, it is necessary to provide a bone conduction pickup that is small in size, low in cost, and has excellent frequency characteristics and is fully compatible with the existing MEMS microphone technology.

technical problem

The purpose of the utility model is to provide a bone conduction pickup that is small in size, low in cost, better in frequency characteristics and fully compatible with the existing MEMS microphone technology.

Technical solutions

The technical solution of the present invention is as follows: a bone conduction pickup, which includes a shell, a microphone provided corresponding to a through hole on the shell, and a circuit board electrically connected to the microphone along the outer side to the inner side of the pickup, and is characterized in that the pickup also includes An elastic pressure member that extends into the through hole and is nested with the microphone and is fixed on the housing. The top of the elastic pressure member is the pressure part, and the pressure part is close to the circuit board and the top surface of the microphone An airtight cavity is formed between.

Preferably, the outer side of the elastic pressure member close to the circuit board is integrally formed with a first step extending in a direction away from the inner side of the through hole, and the top surface of the first step conflicts with the bottom surface of the housing.

Preferably, the distance from the side of the pressure receiving portion away from the circuit board to the top surface of the first step is greater than the distance from the top surface of the housing to the top surface of the first step.

Preferably, the inner side of the elastic pressure member facing away from the circuit board is integrally formed with a second step extending in a direction close to the inner side of the through hole, and the bottom surface of the second step is in conflict with the top surface of the microphone.

Preferably, an auxiliary cavity is provided between the top surface of the second step and the pressure receiving portion.

Preferably, the sound pickup further includes a rigid reinforcement sheet fixed in the auxiliary cavity.

Preferably, the material of the rigid reinforcement sheet is one of metal, plastic, ceramic or glass.

Preferably, the top surface of the second step is coplanar with the top surface of the housing.

Preferably, the elastic pressure member is an integrally formed member.

Preferably, the material of the elastic pressure member is one of rubber or silica gel.

Beneficial effect

Compared with the prior art, the utility model has the beneficial effects that: the utility model adopts the elastic pressure member to cooperate with the microphone to form an airtight cavity, and the pressure member of the elastic pressure member is deformed by vibration and compression, which causes the pressure in the airtight cavity Change, the microphone restores the pressure change to a sound signal, thereby obtaining a low-cost, small-sized, and excellent frequency characteristic bone conduction pickup, which is fully compatible with the existing MEMS microphone technology.

Description of the drawings

Figure 1 is a three-dimensional view of the pickup structure of the utility model;

Figure 2 is an exploded view of the pickup structure of the utility model;

Figure 3 is a cross-sectional view at A-A in Figure 1;

Figure 4 is a three-dimensional view of the structure of the elastic compression member of the present invention;

Fig. 5 is a cross-sectional view at B-B in Fig. 4.

The best mode of the present invention

The present utility model will be further explained below in conjunction with the drawings and embodiments.

The present invention provides a bone conduction pickup, as shown in Figures 1 and 2. The figure is from top to bottom in the direction from the outside to the inside of the pickup, which in turn includes a housing 1, a microphone 3, and a circuit board 2. The housing 1 is provided There is a through hole 11, the circuit board 2 is provided with a microphone 3 at a position corresponding to the through hole 11 of the housing 1, the microphone 3 is electrically connected to the circuit board 2, and the through hole 11 is provided with an elastic pressure member 4. The elastic pressure member 4 extends from the side of the housing 1 close to the circuit board 2 into the through hole 11 to the side of the housing 1 away from the circuit board 2, that is, the elastic pressure member 4 extends from the inner side of the pickup into the through hole 11 To the outside of the pickup. The elastic pressure member 4 is nested with the microphone 3 arranged at a position corresponding to the through hole 11, and the elastic pressure member 4 is fixed to the housing 1. The top of the elastic pressure-receiving member 4 is a pressure-receiving portion 41, which is in contact with the human bone protrusion on the outside of the pickup, and the side of the pressure-receiving portion 41 close to the circuit board 2 and the top of the microphone 3 An airtight cavity 6 is formed between the surfaces, and the mechanical vibration is transmitted from the protruding part of the human bone to the pressure-receiving part 41. The material of the elastic pressure-receiving part 4 is rubber or silicone. The pressure-receiving part of the elastic pressure-receiving part 4 41 is compressed and deformed, which in turn causes the air in the airtight cavity 6 to be compressed and stretched, which changes the pressure. The microphone 3 picks up the pressure signal of the air pressure change in the airtight cavity 6 and restores it to a sound signal. The direct contact between the human bones and the elastic pressure member 4 converts mechanical vibrations into sound signals. The transmission scheme has better frequency characteristics and simple structure, which can reduce production costs and improve the miniaturization of the pickup.

More preferably, the microphone 3 is a MEMS microphone. Since the MEMS microphone can be directly used to collect the pressure signal, the microphone can be further miniaturized.

Preferably, as shown in FIG. 3, a first step 42 is integrally formed on the outside of the elastic pressure member 4, and the first step 42 is provided at an end of the elastic pressure member 4 close to the circuit board 2. The first step 42 is arranged around the outer side of the elastic pressure member 4, the first step 42 extends from the outer surface of the elastic pressure member 4 in a direction away from the inner side of the through hole 11, and the top surface of the first step 42 is in contact with the The bottom surface of the housing 1 is in contact with each other, and the top surface of the first step 42 is glued to the bottom surface of the housing 1, so as to fix the elastic pressure member 4 on the housing 1. The bottom surface is positioned on the pressure receiving portion 41 of the elastic pressure member 4 so that the elastic pressure member 4 protrudes from the through hole 11 to the outside of the pickup by an appropriate height to match the user's wear.

Preferably, the distance from the side of the pressure receiving portion 41 away from the circuit board 2 to the top surface of the first step 42 is greater than the distance from the top surface of the housing 1 to the top surface of the first step 42, so that the elastic pressure member 4 is The pressing portion extends above the top surface of the housing 1 so that the pressure receiving portion 41 directly contacts the bone protrusions of the human body, avoiding transmission loss of mechanical vibration on the housing 1 and improving the frequency characteristics of bone conduction of the pickup.

Preferably, as shown in FIG. 3, a second step 43 is integrally formed inside the elastic pressure member 4, and the second step 43 is provided at an end of the elastic pressure member 4 away from the circuit board 2. The second step 43 is arranged around the inner side of the elastic pressure member 4, the second step 43 extends from the inner surface of the elastic pressure member 4 in a direction close to the inner side of the through hole 11, and the bottom surface of the second step 43 is connected to the microphone 3 The bottom surface of the second step 43 conflicts with the top surface of the microphone 3, and the bottom surface of the second step 43 is glued to the top surface of the microphone 3 to connect the microphone 3 and the elastic pressure member 4 While the phase is fixed, the sealing performance of the airtight cavity is improved.

Preferably, as shown in FIGS. 4 and 5, an auxiliary cavity 44 is provided between the second step 43 and the pressure receiving portion 41, and the auxiliary cavity 44 is close to the line from the top surface of the second step 43 and the pressure receiving portion 41. A gap is formed between one side of the board 2. A rigid reinforcement sheet 5 is arranged in the auxiliary cavity 44, and the material of the rigid reinforcement sheet 5 is one of metal, plastic, ceramic, or glass, so as to optimize the sensitivity of the pickup to collect pressure signals.

More preferably, as shown in FIG. 3, the top surface of the second step 43 is coplanar with the top surface of the housing 1, so that the position of the rigidity-enhancing sheet 5 is above the top surface of the housing 1, so that the pressure receiving portion 41 is compressed At this time, the deformation can be sufficiently transmitted to the rigidity enhancement sheet 5 to reduce the distortion of the pressure signal.

Therefore, the present invention uses an elastic pressure member to cooperate with a microphone to form an airtight cavity. The pressure member of the elastic pressure member is squeezed and deformed by vibration to cause a pressure change in the airtight cavity, and the microphone restores the pressure change to a sound signal. Obtain low-cost, small size, and excellent frequency characteristics of bone conduction pickups, and can be fully compatible with the existing MEMS microphone technology.

The above are only the embodiments of the present utility model. It should be pointed out here that for those of ordinary skill in the art, improvements can be made without departing from the inventive concept of the present utility model, but these all belong to The scope of protection of the utility model.

Claims

A bone conduction pickup includes a shell, a microphone provided corresponding to a through hole on the shell, and a circuit board electrically connected to the microphone along the outer side to the inner side of the pickup, and is characterized in that the pickup also includes a through hole extending into the through hole and the microphone An elastic pressure member nested and fixed on the housing, the top of the elastic pressure member is a pressure part, and an airtight cavity is formed between a side of the pressure part close to the circuit board and the top surface of the microphone.
The bone conduction pickup according to claim 1, wherein the first step extending in the direction away from the inner side of the through hole is integrally formed around the end of the elastic pressure member close to the circuit board. The top surface of the shell conflicts with the bottom surface of the housing.
The bone conduction pickup according to claim 2, wherein the distance from the side of the pressed portion away from the circuit board to the top surface of the first step is greater than the distance from the top surface of the housing to the top surface of the first step .
The bone conduction pickup according to claim 1, wherein the inner side of the elastic pressure member facing away from the circuit board is integrally formed with a second step extending in a direction close to the inner side of the through hole. The bottom surface of the microphone conflicts with the top surface of the microphone.
The bone conduction pickup according to claim 4, wherein an auxiliary cavity is provided between the top surface of the second step and the pressure receiving portion.
The bone conduction pickup according to claim 5, wherein the pickup further comprises a rigid reinforcement sheet fixed in the auxiliary cavity.
The bone conduction pickup according to claim 6, wherein the material of the rigid reinforcement sheet is one of metal, plastic, ceramic or glass.
The bone conduction pickup according to claim 5, wherein the top surface of the second step is coplanar with the top surface of the housing.
The bone conduction pickup according to claim 1, wherein the microphone is a MEMS microphone.
The bone conduction pickup according to claim 1, wherein the material of the elastic pressure member is one of rubber or silicone.