CN211656377U

CN211656377U - Bone conduction sound pickup

Info

Publication number: CN211656377U
Application number: CN201922456594.8U
Authority: CN
Inventors: 张金宇
Original assignee: AAC Acoustic Technologies Shenzhen Co Ltd
Current assignee: AAC Technologies Holdings Shenzhen Co Ltd
Priority date: 2019-12-27
Filing date: 2019-12-27
Publication date: 2020-10-09
Anticipated expiration: 2029-12-27

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

Bone conduction sound pickup

[ technical field ] A method for producing a semiconductor device

The utility model belongs to the technical field of the osteoacusis technique and specifically relates to a osteoacusis adapter is related to.

[ background of the invention ]

As is well known, bone conduction sound pickup is based on the principle of collecting mechanical vibration of a bone protrusion and converting a vibration signal into an acoustic signal for output. However, at present, bone conduction pickup devices are divided into a vibration pickup microphone for sensing vibration acceleration and a contact type bone conduction microphone for collecting pressure change of a contact point, wherein the bone conduction pickup device has a small volume, does not need to be in contact with a human body, but has poor frequency response characteristics, is easy to lose multi-voice information, and adopts an acceleration sensor with high cost, and a microphone compatible scheme has patent restrictions and is inconvenient for people to use; the latter is a piezoelectric type with a high frequency characteristic, a large volume (generally, a diameter of 10mm or more), and a high cost, and is often used in special applications such as military applications and is rarely used in electronic devices for civil use.

Therefore, there is a need for a bone conduction microphone that is small, low cost, and has good frequency characteristics and is fully compatible with existing MEMS microphone technology.

[ Utility model ] content

An object of the utility model is to provide a bone conduction adapter that small, with low costs, frequency characteristic are better and can compatible current MEMS microphone technology completely.

The technical scheme of the utility model as follows: 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 a perforation on the shell and with the circuit board that microphone electricity is connected, its characterized in that: the sound pick-up further comprises an elastic compression piece which extends into the through hole and is embedded in the microphone and fixed on the shell, the top of the elastic compression piece is a compression part, and an airtight cavity is formed between one surface, close to the circuit board, of the compression part and the top surface of the microphone.

Preferably, one end of the outer side of the elastic pressure-receiving part, which is close to the circuit board, is integrally formed with a first step extending along the direction away from the inner side of the through hole in a surrounding manner, and the top surface of the first step is abutted to the bottom surface of the shell.

Preferably, the distance from one surface of the pressed part, which is far away from the circuit board, to the first step top surface is greater than the distance from the shell top surface to the first step top surface.

Preferably, the one end that the inboard deviates from the circuit board of elasticity pressure-receiving piece encircles the shaping along being close to the inside direction extension of through-hole second ladder, the bottom surface and the top surface of microphone of second ladder are inconsistent.

Preferably, an auxiliary cavity is arranged between the top surface of the second step and the pressed part.

Preferably, the sound pickup further comprises 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 integrally formed member.

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

Compared with the prior art, the beneficial effects of the utility model reside in that: the utility model discloses an elasticity receives the piece and forms airtight chamber with the microphone cooperation, and the piece that receives of elasticity receives 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 the bone conduction adapter that low cost, small, frequency characteristic are outstanding, and can compatible current MEMS microphone technology completely.

[ description of the drawings ]

FIG. 1 is a perspective view of the sound pickup of the present invention;

FIG. 2 is an exploded view of the structure of the sound pickup of the present invention;

FIG. 3 is a cross-sectional view taken at A-A of FIG. 1;

FIG. 4 is a perspective view of the elastic compression element of the present invention;

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

[ detailed description ] embodiments

The present invention will be further described with reference to the accompanying drawings and embodiments.

The invention provides a bone conduction sound pick-up, as shown in fig. 1 and 2, the bone conduction sound pick-up sequentially comprises a shell 1, a microphone 3 and a circuit board 2 from top to bottom in the figure along the direction from the outer side to the inner side of the sound pick-up, a through hole 11 is arranged on the shell 1, the microphone 3 is arranged on the circuit board 2 corresponding to the through hole 11 of the shell 1, the microphone 3 is electrically connected with the circuit board 2, an elastic pressure piece 4 is arranged in the through hole 11, the elastic pressure piece 4 extends into the through hole 11 from one side of the shell 1 close to the circuit board 2 to one side of the shell 1 far away from the circuit board 2, namely the elastic pressure piece 4 extends into the through hole 11 from the inner side of the sound pick-. The elastic pressure-receiving piece 4 is nested with the microphone 3 arranged at the position corresponding to the through hole 11, and the elastic pressure-receiving piece 4 is fixed with the shell 1. The top of the elastic compression piece 4 is provided with a compression part 41, the compression part 41 is contacted with the human bone bulge outside the sound pick-up, an airtight cavity 6 is formed between one surface of the pressed part 41 close to the circuit board 2 and the top surface of the microphone 3, mechanical vibration is conducted from the human bone convex part to the pressed part 41, the elastic compression piece 4 is made of one of rubber or silica gel, the compression part 41 of the elastic compression piece 4 is compressed to generate deformation, which in turn causes the air inside the airtight chamber 6 to be compressed and stretched, causing a pressure change, the microphone 3 picks up a pressure signal of the air pressure change inside the airtight chamber 6, the transmission scheme of converting mechanical vibration into sound signals through direct contact of human bones and the elastic pressure piece 4 has good frequency characteristics, simple structure and can reduce production cost and improve the miniaturization of the sound pick-up.

Preferably, the microphone 3 is an MEMS microphone, and the microphone can be further miniaturized because the MEMS microphone can be directly used to collect pressure signals.

Preferably, as shown in fig. 3, elastic pressure piece 4 outside integrated into one piece has first ladder 42, first ladder 42 sets up in the one end that elastic pressure piece 4 is close to circuit board 2, first ladder 42 encircles elastic pressure piece 4's the outside sets up, first ladder 42 extends to the inboard direction of keeping away from through hole 11 from elastic pressure piece 4's outside surface, first ladder 42's top surface with the bottom surface of shell 1 offsets, just first ladder 42's top surface with the bottom surface of shell 1 is glued joint mutually, plays the time of being fixed in elastic pressure piece 4 on shell 1 to the bottom surface of shell 1 is fixed a position elastic pressure piece 4's pressure portion 41, so that elastic pressure piece 4 stretches out suitable height to the adapter outside from through hole 11 to the adapter for the cooperation user dresses.

Preferably, the distance from the surface of the pressed part 41 departing 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 pressed part of the elastic pressed part 4 extends out of the top surface of the housing 1, the pressed part 41 is in direct contact with a bone protruding part of a human body, the transmission loss of mechanical vibration on the housing 1 is avoided, and the frequency characteristic of bone conduction of the sound pick-up is improved.

Preferably, as shown in fig. 3, the inboard integrated into one piece of elasticity pressure receiving piece 4 has second ladder 43, second ladder 43 sets up in the one end that elasticity pressure receiving piece 4 deviates from circuit board 2, second ladder 43 encircles the inboard setting of elasticity pressure receiving piece 4, second ladder 43 extends from the inboard surface of elasticity pressure receiving piece 4 to be close to the inboard direction of through hole 11 mutually, the bottom surface of second ladder 43 with the top surface of microphone 3 offsets, the bottom surface of second ladder 43 offsets with the top surface of microphone 3, just the bottom surface of second ladder 43 splices mutually with the top surface of microphone 3, plays microphone 3 and elasticity pressure receiving piece 4 fixed mutually in the time, improves the leakproofness in airtight chamber.

Preferably, as shown in fig. 4 and 5, an auxiliary cavity 44 is provided between the second step 43 and the pressed part 41, and the auxiliary cavity 44 is formed by a gap reserved between the top surface of the second step 43 and a surface of the pressed part 41 close to the circuit board 2. A rigid reinforcing sheet 5 is arranged in the auxiliary cavity 44, 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.

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, and when the pressure receiving portion 41 is pressed, the deformation can be sufficiently transmitted to the rigid reinforcing sheet 5, so as to reduce the distortion of the pressure signal.

Therefore, the utility model discloses an elasticity receives the piece and forms airtight chamber with the microphone cooperation, and the piece that receives of elasticity receives the piece receives vibration extrusion deformation to arouse airtight intracavity pressure variation, and the microphone reduces the pressure variation for sound signal, and then obtains the bone conduction adapter that low cost, small, frequency characteristic are outstanding, and can compatible current MEMS microphone technology completely.

The above embodiments of the present invention are only described, and it should be noted that, for those skilled in the art, modifications can be made without departing from the inventive concept, but these all fall into the protection scope of the present invention.

Claims

1. 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 a perforation on the shell and with the circuit board that microphone electricity is connected, its characterized in that: the sound pick-up further comprises an elastic compression piece which extends into the through hole and is embedded in the microphone and fixed on the shell, the top of the elastic compression piece is a compression part, and an airtight cavity is formed between one surface, close to the circuit board, of the compression part and the top surface of the microphone.

2. A bone conduction microphone as claimed in claim 1, wherein: the one end an organic whole that the elasticity is pressed the piece outside and is close to the circuit board encircles the shaping and has along keeping away from the first ladder that the inside direction of through-hole extends, the top surface of first ladder with the bottom surface counterbalance of shell.

3. A bone conduction microphone as claimed in claim 2, wherein: the distance from one surface of the pressed part, which deviates from the circuit board, to the first step top surface is greater than the distance from the shell top surface to the first step top surface.

4. A bone conduction microphone as claimed in claim 1, wherein: the one end an organic whole that the inboard circuit board that deviates from of elasticity pressure piece encircles the shaping has along being close to the second ladder that the inboard direction of through-hole extends, the bottom surface of second ladder is inconsistent with the top surface of microphone.

5. A bone conduction microphone as claimed in claim 4, wherein: an auxiliary cavity is arranged between the top surface of the second step and the pressed part.

6. A bone conduction microphone as claimed in claim 5, wherein: the sound pick-up further comprises a rigid reinforcing sheet fixed in the auxiliary cavity.

7. A bone conduction microphone as claimed in claim 6, wherein: the material of the rigid reinforcing sheet is one of metal, plastic, ceramic or glass.

8. A bone conduction microphone as claimed in claim 5, wherein: the top surface of the second step is coplanar with the top surface of the housing.

9. A bone conduction microphone as claimed in claim 1, wherein: the microphone is a MEMS microphone.

10. A bone conduction microphone as claimed in claim 1, wherein: the elastic pressure piece is made of one of rubber or silica gel.