CN202150937U

CN202150937U - Capacitive microphone with acoustic regulating part

Info

Publication number: CN202150937U
Application number: CN201120246668U
Authority: CN
Inventors: 张胜坤; 杨道沧
Original assignee: Merry Electronics Shenzhen Co ltd
Current assignee: Merry Electronics Shenzhen Co ltd
Priority date: 2011-07-13
Filing date: 2011-07-13
Publication date: 2012-02-22
Anticipated expiration: 2021-07-13

Abstract

The utility model discloses a capacitive microphone with an acoustic regulating part, belonging to the technical field of microphones. The capacitive microphone comprises a housing, a circuit board, a vibration member, an electret, an acoustic regulating part, a copper ring and insulating rings, wherein one end of the vibration member is electrically connected with the housing, the vibration member vibrates due to inputted sound pressure of a sound hole, one end of the electret is provided with an electret portion which has a certain distance from the vibration member, the electret comprises a plurality of pole holes, an inner chamber is formed between the acoustic regulating part and the electret, the acoustic regulating part is provided with a gas hole, the copper ring is arranged between the acoustic regulating part and the circuit board, and the insulating rings are arranged among the electret, the acoustic regulating part and the housing. The inner chamber is formed between the acoustic regulating part arranged in the housing and the electret, the gas hole is arranged on the acoustic regulating part by etching technology, ventilation can be controlled, rear sound sources are uniformly supplied to the inner chamber, and a better acoustic effect is reached.

Description

Electret Condencer Microphone with acoustics regulating part

Technical field

The utility model belongs to the microphone techniques field, especially relates to a kind of etch process that utilizes and makes the acoustics regulating part, in capacitance microphone, forms an inner cavity chamber, and then improves the Electret Condencer Microphone of pointing capability.

Background technology

Flourish along with the 3C electronic product, acoustic sensor requires relatively increasingly high for the conversion performance of sound, particularly when using each item electronic product, for the requirement of acoustic characteristic, haggle over every penny especially.

Shown in Figure 1 is existing Electret Condencer Microphone 100 profiles; It comprises columnar shell 1; Shell 1 has a sound hole 1a; In the open end of shell 1 circuit board 2 is set, which is provided with a signal amplifying apparatus 2a and a back sound hole 2b, in shell 1 inwall and be adjacent to sound hole 1a and be sequentially provided with a retainer ring 3, a vibrating membrane 4, an insulating washer 5, a pole plate 6, a wire netting 7 and the dead ring 8 that is located between circuit board 2 and the wire netting 7 is set; Dead ring 8 is as the electric connection that prevents between shell 1 and pole plate 6, the wire netting 7, and synchronous signal amplifying device 2a goes up and is connected in wire netting 7 by an electrical connector 2c.Wherein, Electret Condencer Microphone 100 can pick up sound to shell 1 inside from sound hole 1a and back sound hole 2b, and acts on respectively on the vibrating membrane 4; When this neither equidirectional sound acts on vibrating membrane 4; Sound wave can be cancelled out each other, and is able to the low frequency noise of environment is eliminated, and picks up single voice signal that points to effectively; So as to making the distance change between vibrating membrane 4 and the pole plate 6 and causing capacitance to change; And,, has the signal of telecommunication of noise reduction characteristics with output via the amplification of signal amplifying apparatus 2a with electrical signal transfer to circuit board 2.

Yet the wire netting 7 of Electret Condencer Microphone 100 is processed with impact style usually, and the aperture of its hole 7a is difficult for making evenly; So can't control throughput effectively; Make the acoustic characteristic of product not have consistency, and wire netting 7 need have certain thickness, just can impose punch process; So integral capacitor formula microphone 100 volumes will be restricted, and can't adapt to the microminiaturized demand of present industry.

The utility model content

In view of this; The purpose of the utility model is to provide a kind of Electret Condencer Microphone with acoustics regulating part; It makes acoustics regulating part and pore thereof by etch process, and is arranged in the Electret Condencer Microphone, to be separated out an inner cavity chamber; Can effectively control throughput, and then improve the pointing capability of Electret Condencer Microphone.

For realizing above-mentioned purpose, the described Electret Condencer Microphone with acoustics regulating part of the utility model includes; One shell has a sound hole and receives external sound, and a circuit board is incorporated into the openend of shell, and carries a field-effect transistor on the circuit board; Circuit board has a perforation, and a vibration component one end electrically connects shell, and vibration component receives sound hole input sound press and vibrates; One electret spare, one end has an electret portion and keeps at a distance with vibration component, and electret spare has several utmost point holes, formation one inner cavity chamber between an acoustics regulating part and the electret spare; The acoustics regulating part is with the etch process making and have a pore; One copper ring is arranged between acoustics regulating part and the circuit board, and a dead ring is arranged between electret spare, acoustics adjustment part and the shell, thereby effectively improves the pointing capability and the acoustic efficiency of Electret Condencer Microphone.

Description of drawings

Fig. 1 is the cross-sectional view of existing Electret Condencer Microphone.

Fig. 2 is the decomposition texture sketch map of the embodiment 1 of the utility model.

Fig. 3 is the cross-sectional view of the embodiment 1 of the utility model.

Fig. 4 is the embodiment 2 decomposition texture sketch mapes of the utility model.

Fig. 5 is the cross-sectional view of the embodiment 2 of the utility model.

[primary clustering symbol description]

100	Electret Condencer Microphone	1	Shell
				1a	Sound hole	2	Circuit board
2a	Signal amplifying apparatus	2b	Back sound hole
				2c	Electrical connector	3	Retainer ring
4	Vibrating membrane	5	Insulating washer
				6	Pole plate	7	Wire netting
8	Dead ring	?	?
				10	Shell	11	Sound hole
20	Vibration component	21	Vibrating membrane
				22	Retainer ring	30	Electret spare
31	Electret portion	32	Utmost point hole
				33	Pad	40	The acoustics regulating part
41	Pole piece	42	Becket
				43	Pore	44	Inner cavity chamber
45	Utmost point portion	46	Ring portion
				47	Pore	48	Breach
50	Copper ring	60	Dead ring
				70	Circuit board	71	Field-effect transistor
72	Perforation	?	?

Embodiment

Below in conjunction with meeting the described Electret Condencer Microphone with acoustics regulating part of the utility model is explained further details with specific embodiment.

Embodiment 1Fig. 2 and shown in Figure 3 be the decomposition texture sketch map and the cross-sectional view of present embodiment.Said Electret Condencer Microphone with acoustics regulating part comprises a shell 10, a vibration component 20, an electret spare 30, an acoustics regulating part 40, a copper ring 50, a

dead ring

60 and 70 formations of a circuit board.

Shell 10 1 ends are provided with a sound hole 11, and the other end then forms an openend.Circuit board 70 is incorporated into the openend of shell 10, and carries a field-effect transistor 71 on the circuit board 70, also can load other passive component on it, and circuit board 70 has a perforation 72.

Vibration component 20 comprises the retainer ring 22 that a vibrating membrane 21 and a metal material are processed, and retainer ring 22 is used for support fixation vibrating membrane 21, and vibration component 20 is arranged at shell 10 inside, and retainer ring 22 electrically connects via shell 10 and circuit board 70.

Electret spare 30 1 end central authorities are provided with an electret portion 31; Have free charge through hyperpolarization on it, and electret portion 31 is provided with several utmost point holes 32, wherein electret spare 30 is relative with vibration component 20; And see through a pad 33 and make electret portion 31 and vibrating membrane 21 keep certain distances, to form an electric capacity space.

Acoustics regulating part 40 is made up of a

pole piece

41 and 42 of beckets in this enforcement, and pole piece 41 is made pore 43 via etch process, sees through becket 42 and keeps spacing with electret spare 30, and describe an inner cavity chamber 44.

Copper ring 50 is arranged between pole piece 41 and the circuit board 70, is used for supporting acoustics regulating part 40 in shell 10 inside.

Dead ring 60 is arranged between electret spare 30, acoustics regulating part 40 and the shell 10, forms short circuit to prevent electret spare 30, acoustics regulating part 40 with shell 10 conductings.

Wherein, preceding source of sound via sound hole 11 by getting in the shell 10, vibrating membrane 21 receive the sound airstream vibration and and the distance between the electret portion 31 change; And then cause capacitance between the two to change; And be passed to circuit board 20, and handle via electronic building brick, make it to convert to corresponding electric signal; And the back sources of sound are introduced in the perforation 72 that sees through circuit board 70, and the back source of sound gets into inner cavity chamber 44 through the pore 43 of acoustics regulating part 40, again via the vibrating membrane 21 of utmost point hole 32 to act on vibration component 20, and obtain the reaction of directive property.

Please, make pore 43, make pore 43 to be produced uniformly because the pole piece 41 of acoustics regulating part 40 adopts the metal material and sees through etch process once more with reference to Fig. 3; Thus, its throughput can be controlled effectively, helps producing the product that meets characteristic; So can obtain the Electret Condencer Microphone of better acoustic characteristic, moreover the utmost point spare 41 of acoustics regulating part 40 can be selected thin sheet metal for use; And do not influence the making of pore 43, help whole miniaturized design.

Embodiment 2Fig. 4 and shown in Figure 5 be the decomposition texture sketch map and the cross-sectional view of present embodiment.Different with embodiment 1 is that acoustics regulating part 40 is embodied as one-body molded, and has a utmost point portion 45 and a ring portion 46; Utmost point portion 45 has several pores 47; And ring portion 46 has a breach 48, and breach 48 has the effect of air-flow guiding, gets into inner cavity chamber 44 apace so that the back source of sound to be provided.In addition, the present embodiment and first embodiment can make pore 47 by etch process equally, so that throughput can be controlled effectively, so Electret Condencer Microphone has acoustic efficiency preferably.

Comprehensively above-mentioned; The described Electret Condencer Microphone of the utility model with acoustics regulating part, it utilizes an acoustics regulating part to be arranged in the shell, and is divided into an inner cavity chamber with electret spare; And the acoustics regulating part sees through etch process and makes pore; The throughput that is effectively controlled gets into inner cavity chamber equably so that the back source of sound to be provided, and can reach better acoustic efficiency.

The above is merely enumerative, but not restraint-type.Any spirit and category that does not break away from the utility model, and to its equivalent modifications of carrying out or change, all should be contained in the protection range of the utility model.

Claims

1. the Electret Condencer Microphone with acoustics regulating part is characterized in that, includes:

One shell, it has a sound hole;

One circuit board, it is incorporated into the openend of this shell, and carries a field-effect transistor on this circuit board, and this circuit board has a perforation;

One vibration component, one of which end electrically connect this shell, and this vibration component receives said sound hole input sound press and vibrates;

One electret spare, one of which end have an electret portion and keep at a distance with this vibration component, and this electret spare has several utmost point holes;

One acoustics regulating part, and form an inner cavity chamber between the said electret spare, and this acoustics regulating part has a pore;

One copper ring is arranged between this acoustics regulating part and this circuit board;

One dead ring is arranged between this electret spare, this acoustics adjustment part and this shell.

2. the Electret Condencer Microphone that has the acoustics regulating part according to claim 1; It is characterized in that: said acoustics regulating part comprises an integrated utmost point portion and a ring portion; Said pore is arranged at utmost point portion, and ring portion is arranged at this utmost point portion periphery, so that this inner cavity chamber is between this electret spare and this utmost point portion.

3. like the said Electret Condencer Microphone with acoustics regulating part of claim 2, it is characterized in that: said ring portion has the breach in order to air-guiding.

4. the Electret Condencer Microphone that has the acoustics regulating part according to claim 1; It is characterized in that: said acoustics regulating part comprises a pole piece and a becket; Said pore is arranged at this pole piece, and this pole piece sees through this becket and this electret spare is kept at a distance, to form this inner cavity chamber.

5. like the said Electret Condencer Microphone with acoustics regulating part of claim 4, it is characterized in that: said copper ring one end is connected to this circuit board, and the other end is supported in this pole piece.