CN211656377U - A bone conduction pickup - Google Patents

Abstract

The utility model provides a bone conduction adapter includes the shell in proper order along the adapter outside to inboard, with the corresponding microphone that sets up of last perforation hole of shell and the circuit board of being connected with microphone electricity, this adapter still including stretch into the through hole with the elasticity on the shell is just fixed in mutually nested mutually to the microphone is pressed the piece, the top of elasticity pressed the piece is for compressed part, form airtight chamber between the one side that compressed part is close to the circuit board and the top surface of microphone, the compressed part of elasticity pressed the piece receives vibration extrusion deformation to arouse airtight intracavity pressure change, and the microphone reduces the pressure change to sound signal, and then obtains low-cost, small, the outstanding bone conduction adapter of frequency characteristic, and can compatible current MEMS microphone technology completely.

Description

A 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 protruding part of the bone, and restore the vibration signal to sound signal output. But at present, bone conduction pickup devices are divided into vibration pickup microphones that sense vibration acceleration and contact bone conduction microphones that collect pressure changes at contact points. It loses a lot of voice information, and the cost of using an acceleration sensor is high. There are patent restrictions on the microphone compatible solution, which is inconvenient for people to use; the latter has better frequency characteristics, but most of them are piezoelectric and have a large volume (generally, the diameter is more than 10mm) , and the cost is high, it is mostly used in special occasions such as military use, and is rarely used in civilian electronic equipment.

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

【Content of utility model】

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

The technical scheme of the utility model is as follows: a bone conduction pickup, which sequentially includes a shell along the outside to the inside of the pickup, a microphone corresponding to a through hole on the shell, and a circuit board electrically connected to the microphone, characterized in that the pickup further comprises: An elastic pressure-receiving member that extends into the through hole and is nested with the microphone and is fixed on the casing. The top of the elastic pressure-receiving member is a pressure-receiving part, and the pressure-receiving part is close to the side of the circuit board and the top surface of the microphone. An airtight cavity is formed between them.

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

Preferably, the distance from the side of the pressure-receiving portion facing 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 end of the elastic pressure-receiving 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 pickup further includes a rigid reinforcing sheet fixed in the auxiliary cavity.

Preferably, the material of the rigid reinforcing 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-receiving member is an integral molded part.

Preferably, the material of the elastic pressure-receiving member is one of rubber or silicone.

Compared with the prior art, the beneficial effect of the present utility model is that the utility model adopts the elastic pressure-receiving member to cooperate with the microphone to form an airtight cavity, and the pressure-receiving member of the elastic pressure-receiving member is deformed by vibration and extrusion, causing the pressure in the airtight cavity. Change, the microphone restores the pressure change to a sound signal, and then obtains a low-cost, small volume, bone conduction pickup with excellent frequency characteristics, and is fully compatible with the existing MEMS microphone technology.

【Description of drawings】

1 is a perspective view of the pickup structure of the present utility model;

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

Fig. 3 is the sectional view at A-A place in Fig. 1;

Fig. 4 is the structural perspective view of the elastic pressure-receiving member of the present invention;

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

【Detailed ways】

The present utility model will be further described below with reference to the accompanying drawings and embodiments.

The present invention provides a bone conduction pickup, as shown in Figures 1 and 2, the figure is from the top to the bottom along the direction from the outside to the inside of the pickup, and includes a casing 1, a microphone 3 and a circuit board 2 in sequence, and the casing 1 is provided with There is a through hole 11, a microphone 3 is provided on the circuit board 2 at a position corresponding to the through hole 11 of the casing 1, the microphone 3 is electrically connected to the circuit board 2, and an elastic pressure-receiving member is arranged in the through hole 11 4. The elastic pressure-receiving member 4 extends from the side of the casing 1 close to the circuit board 2 into the through hole 11 to the side of the casing 1 away from the circuit board 2, that is, the elastic pressure-receiving member 4 extends from the inner side of the pickup into the through hole 11 to the outside of the pickup. The elastic pressure-receiving member 4 is nested with the microphone 3 disposed at the position corresponding to the through hole 11 , and the elastic pressure-receiving member 4 is fixed to the housing 1 . The top of the elastic pressure-receiving member 4 is the pressure-receiving part 41 , the pressure-receiving part 41 is in contact with the bulge of the human body outside the pickup, and the side of the pressure-receiving part 41 close to the circuit board 2 is in contact with 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 a kind of rubber or silicone, and 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, causing the pressure to change. 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 conduction scheme in which the direct contact between the human bone and the elastic pressure-receiving member 4 converts the mechanical vibration into a sound signal has better frequency characteristics and a simple structure, which can reduce the production cost 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 outer side of the elastic pressure-receiving member 4 . 42 is arranged around the outer side of the elastic pressure-receiving member 4, the first step 42 extends from the outer side surface of the elastic pressure-receiving 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 connected to the inner side of the through hole 11. 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 that the elastic pressure-receiving member 4 is fixed on the housing 1 and the bottom surface of the housing 1 The pressure-receiving portion 41 of the elastic pressure-receiving member 4 is positioned so that the elastic pressure-receiving member 4 can protrude from the through hole 11 to the outside of the pickup by an appropriate height, so as to fit the user's wear.

Preferably, the distance from the side of the pressure-receiving portion 41 facing 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-receiving member 4 is pressed The part protrudes above the top surface of the shell 1, so that the pressure-receiving part 41 is in direct contact with the bony protruding part of the human body, avoiding the transmission loss of mechanical vibration on the shell 1, and improving the frequency characteristics of the bone conduction of the pickup.

Preferably, as shown in FIG. 3 , the inner side of the elastic pressure-receiving member 4 is integrally formed with a second step 43 , and the second step 43 is disposed at the end of the elastic pressure-receiving member 4 away from the circuit board 2 . 43 is disposed around the inner side of the elastic pressure-receiving member 4 , the second step 43 extends from the inner surface of the elastic pressure-receiving member 4 to the direction of the inner side of the through hole 11 , and the bottom surface of the second step 43 is connected to the microphone 3 . The top surface of the second step 43 is in conflict with the top surface of the microphone 3 , and the bottom surface of the second step 43 is glued with the top surface of the microphone 3 , so as to connect the microphone 3 and the elastic pressure-receiving 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 part 41 , and the auxiliary cavity 44 is close to the line from the top surface of the second step 43 and the pressure-receiving part 41 . A gap is reserved between one side of the board 2 to form. The auxiliary cavity 44 is provided with a rigid reinforcing sheet 5, and the material of the rigid reinforcing sheet 5 is one of metal, plastic, ceramic or glass, so as to optimize the sensitivity of the pickup for collecting 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 rigid reinforcing sheet 5 is above the top surface of the housing 1 , so that the pressure-receiving portion 41 is pressed. At this time, the deformation can be fully transmitted to the rigid reinforcing sheet 5, so as to reduce the distortion of the pressure signal.

Thereby, the present invention adopts the elastic pressure-receiving member to cooperate with the microphone to form an airtight cavity, and the pressure-receiving member of the elastic pressure-receiving member is subjected to vibration and extrusion deformation to cause the pressure change in the airtight cavity, and the microphone restores the pressure change into a sound signal, and then Obtain a low-cost, small-volume, bone-conduction microphone with excellent frequency characteristics, which is fully compatible with the existing MEMS microphone technology.

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

Claims (10)

1. a bone conduction pickup, along the outside to the inside of the pickup, sequentially comprising a shell, a microphone set corresponding to the through-hole on the shell and a circuit board electrically connected to the microphone, it is characterized in that: the pickup also comprises a through hole extending into the through hole and a circuit board connected to the microphone. An elastic pressure-receiving member that is nested with the microphones and fixed on the casing, the top of the elastic pressure-receiving member is a pressure-receiving part, and an airtight cavity is formed between the side of the pressure-receiving part close to the circuit board and the top surface of the microphone . 2 . The bone conduction microphone according to claim 1 , wherein a first step extending in a direction away from the inner side of the through hole is integrally formed around an end of the outer side of the elastic pressure-receiving member close to the circuit board. 3 . The top surface of a step interferes with the bottom surface of the housing. 3 . The bone conduction microphone according to claim 2 , wherein the distance from the side of the pressure-receiving portion facing 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. 4 . distance. 4 . The bone conduction microphone according to claim 1 , wherein the end of the inner side of the elastic pressure-receiving 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. 5 . The bottom surface of the second step interferes with the top surface of the microphone. 5 . The bone conduction microphone according to claim 4 , wherein an auxiliary cavity is provided between the top surface of the second step and the pressure-receiving portion. 6 . 6 . The bone conduction pickup according to claim 5 , wherein the pickup further comprises a rigid reinforcing sheet fixed in the auxiliary cavity. 7 . 7 . The bone conduction microphone according to claim 6 , wherein the material of the rigid reinforcing sheet is one of metal, plastic, ceramic or glass. 8 . 8 . The bone conduction microphone according to claim 5 , wherein the top surface of the second step is coplanar with the top surface of the housing. 9 . 9 . The bone conduction microphone according to claim 1 , wherein the microphone is a MEMS microphone. 10 . 10 . The bone conduction microphone according to claim 1 , wherein the material of the elastic pressure-receiving member is one of rubber or silicone. 11 .

Images