CN201094164Y

CN201094164Y - Condenser microphone with vibration-proof and moisture-proof units on sound hole of housing

Info

Publication number: CN201094164Y
Application number: CNU2007201830113U
Authority: CN
Inventors: 宋清淡; 李锺燮
Original assignee: BO SUNG ELECTRICS Co Ltd
Current assignee: BO SUNG ELECTRICS Co Ltd
Priority date: 2006-12-18
Filing date: 2007-10-12
Publication date: 2008-07-30
Anticipated expiration: 2017-10-12
Also published as: KR20080056441A; TWM331726U; KR100854310B1

Abstract

The utility model provides a capacitance microphone of which a sound hole of a shell is provided with a vibration insulating unit and a moistureproof unit. The capacitance microphone of the utility model includes a mechanism structure composed of a pair of vibration board and a backboard and arranged between the shell and a PCB, wherein, the shell is opened at one side, and the bottom surface and the sidewall of shell are formed into a cylinder shape, a sound hole is formed on the bottom surface, the vibration insulating and the moistureproof units used for preventing exterior dust and moisture from flowing into in the sound hole and the shell body are integrated into a whole, the vibration insulating and the moistureproof units are tiny holes or screen stencils formed in the sound hole of the shell, and can enhance bearing pressure with the help of a supporting frame, and one or at least two is/ are formed at the center of the bottom surface or on the whole bottom surface. Furthermore, the capacitance microphone can solve the problem caused by no slub cloth exposing, and the problem that the thickness of the capacitance microphone is increased correspondingly under the condition that the inner side of the shell of the capacitance microphone is added with a metal sheet which plays the role of non-woven fabrics.

Description

The sound hole of housing is provided with the condenser microphone of vibrationproof and moistureproof unit

Technical field

The utility model relates to condenser microphone, in more detail, relates to the condenser microphone that hole is provided with vibrationproof and moistureproof unit.

Background technology

Usually, the condenser microphone that is widely used in mobile communication terminal or sound equipment etc. is by constituting as the lower part: biased element; A pair of diaphragm/back-plate, it is used to form the capacitor (C) that changes accordingly with acoustic pressure; And junction field effect transistor (JFET), it is used for buffer output signal.The condenser microphone of this typical way is made in the following way: assemble oscillating plate, spacer ring, dead ring, backboard, conducting ring, printed circuit board (PCB) (PCB) integratedly afterwards in a housing, with the end curling (curling) of housing.

And, shown in Fig. 1 (a) and (b), usually on the housing 20 of condenser microphone, be formed with a plurality of hole 20a, in order to prevent that outside dust etc. from flowing into the inner microphone tonequality that causes of microphone by this hole 20a and descending, as shown in Figures 2 and 3, nonwoven fabrics 10 is pasted the outside of microphone case 20, perhaps, will play the sheet metal 10 of nonwoven fabrics effect ' paste microphone inside.

But, nonwoven fabrics 10 is pasted under the situation of microphone case 20 outsides, not only need to append the manufacturing process that is used to paste nonwoven fabrics 10, also exist because of nonwoven fabrics expose produce inconvenience problem.In order to address this is that, the inner additional sheet metal 10 that plays the nonwoven fabrics effect of microphone case 20 ' situation under, have the also corresponding increase of thickness of condenser microphone, the problem that smoothness descends.

Especially, as shown in Figure 3, with sheet metal 10 ' be installed in the structure of microphone inside, during assembling, the polar ring of oscillating plate (polar-ring) is pushed sheet metal, makes the central portion of sheet metal pile up to vibrating membrane (diaphragm) side, destroys the smoothness of sheet metal, sheet metal is contacted with vibrating membrane, thereby on vibrating membrane, produce bad.That is, when sheet metal contacts with vibrating membrane, produce cut (flaw) on vibrating membrane, this cut becomes the bad reason of SMD Reflow Soldering (reflow).In addition, there are the following problems with the structure of sheet metal 10 ' be installed to microphone inside as shown in Figure 3: when carrying out constant temperature/constant humidity test, and residue moisture on the sheet metal and cause bad.

The utility model content

The utility model proposes in order to address the above problem, and the purpose of this utility model is, a kind of condenser microphone that is formed with vibrationproof and moistureproof unit in the sound hole of housing is provided.

In order to achieve the above object, condenser microphone of the present utility model comprises the mechanical structure that is made of a pair of oscillating plate and backboard between housing and printed circuit board (PCB) (PCB), an opening of above-mentioned housing and form tubular by basal surface and sidewall, form sound hole on the above-mentioned basal surface, be used in the above-mentioned sound hole to prevent that vibrationproof that outside dust and moisture flow into and moistureproof unit and above-mentioned housing from forming as one.

Herein, above-mentioned vibrationproof and moistureproof unit are micropore or the screen cloth (mesh) of sound in the hole that is formed at above-mentioned housing, above-mentioned vibrationproof and moistureproof unit strengthen supporting force by support, and, central authorities at above-mentioned basal surface are formed with one or at least two above-mentioned vibrationproof and moistureproof unit, and perhaps above-mentioned vibrationproof and moistureproof unit are formed on the whole basal surface.

As mentioned above, according to the utility model, in condenser microphone, be used to prevent that outside dust or moisture are directly integrally formed with sound hole of housing by vibrationproof and moistureproof unit (nonwoven fabrics, sheet metal etc.) that the sound hole flow into microphone inside, thereby solved the problem that produces when such in the past nonwoven fabrics is exposed to outside or is inserted into the inner space of housing.Promptly, the utility model can solve because nonwoven fabrics exposes caused problem and in the inboard of microphone case the problem of the corresponding increase of thickness of condenser microphone during the additional sheet metal that plays the nonwoven fabrics effect, the smoothness that can also solve the sheet metal that is installed to enclosure interior descends and the problem that causes.

In addition, if as the utility model, on the sound hole of housing, form vibrationproof and moistureproof unit, then at high temperature also thermal deformation can not take place, thereby can be applied directly among the SMD in the one mode, can solve by the bad problem that causes of nonwoven fabrics, have the advantage that operation is simplified.

Description of drawings

Fig. 1 (a) and (b) are synoptic diagrams of the housing of the existing condenser microphone of expression.

Fig. 2 is illustrated in the existing condenser microphone to paste the example of nonwoven fabrics as vibrationproof and moistureproof unit in hull outside.

Fig. 3 is illustrated in the existing condenser microphone at the inboard example of pasting sheet metal as vibrationproof and moistureproof unit of housing.

Fig. 4 (a) and (b) are first embodiment that expression sound of the present utility model hole is provided with the microphone case of vibrationproof and moistureproof unit.

Fig. 5 (a) and (b) are second embodiment that expression sound of the present utility model hole is provided with the microphone case of vibrationproof and moistureproof unit.

Fig. 6 is the side cross-sectional view that expression sound of the present utility model hole is provided with the condenser microphone of vibrationproof and moistureproof unit.

Fig. 7 is other embodiment that expression sound of the present utility model hole is provided with the microphone case of vibrationproof and moistureproof unit.

Symbol description

102,202,302 housings; 102a, 202a, 302a sound hole; 104,204,304 screen clothes; 206 supports

Embodiment

Below, describe preferred embodiment of the present utility model in detail with reference to accompanying drawing.

Fig. 4 (a) and (b) are first embodiment that expression sound of the present utility model hole is provided with the condenser microphone housing of vibrationproof and moistureproof unit, (a) are vertical view, (b) are side cross-sectional view.

Shown in Fig. 4 (a) and (b), condenser microphone housing 102 of the present utility model is the cylindrical shape of an opening, the central authorities of basal surface are formed with circular sound hole 102a, and, be formed with screen cloth 104 on the sound hole 102a, with as the vibrationproof and the moistureproof unit that play with existing nonwoven fabrics identical function, prevent that foreign matter from flowing into microphone inside by sound hole 102a.

The mode that forms vibrationproof and moistureproof unit on the sound hole 102a of housing 102 of the present utility model can adopt multiple modes such as the mode of having utilized vacuum target (target), ultra tiny process technology, micro-processing technology, the shape of vibrationproof and moistureproof unit can adopt folk prescription to or the multiple shapes such as micropore of twocouese screen cloth or circle or polygonal shape.

Fig. 5 (a) and (b) are second embodiment that expression sound of the present utility model hole is provided with the condenser microphone housing of vibrationproof and moistureproof unit, (a) are vertical view, (b) are side cross-sectional view.

Shown in Fig. 5 (a) and (b), condenser microphone housing 202 of the present utility model is the cylindrical shape of an opening, the central authorities of basal surface are formed with circular sound hole 202a, and, sound is formed with screen cloth 204 on the 202a of hole, with as the vibrationproof and the moistureproof unit that play with existing nonwoven fabrics identical function, and, in order to improve bearing strength, also be formed with sound hole 202a is divided into cross support 206.As mentioned above, microphone case 202 of the present utility model forms the screen cloth 204 that plays the nonwoven fabrics effect at sound hole 202a from one's body, can prevent that foreign matter from flowing into microphone inside by sound hole 202a.

According to the utility model, the mode that forms vibrationproof and moistureproof unit on the sound hole 102a of housing 102 can adopt multiple modes such as the mode of having utilized the vacuum target, ultra tiny process technology, micro-processing technology, the shape of vibrationproof and moistureproof unit can adopt folk prescription to or the multiple shapes such as micropore of twocouese screen cloth or circle or polygonal shape.

Fig. 6 is the side cross-sectional view that sound of the present utility model hole is provided with the condenser microphone of vibrationproof and moistureproof unit.

According to the utility model, the condenser microphone that sound hole 102a is provided with vibrationproof and moistureproof unit 104 is formed with vibrationproof and moistureproof unit 104 on the sound hole 102a of housing 102 as shown in Figure 6, flow into microphone inside to prevent outside foreign matter.

Referring to Fig. 6, condenser microphone of the present utility model is by constituting as the lower part: oscillating plate 106, and it is electrically connected with the PCB side by housing 102, plays the effect of movable electrode; Sept 108; Dead ring 110; Backboard 112 is formed with electret on it, play the effect of fixed electrode; Conducting ring 114, it makes backboard 112 conduct electricity to the PCB side; And PCB 116, circuit element (not shown) is installed on it, the static capacity variation that is used for presenting by the acoustic pressure that flows into via sound hole 102a between oscillating plate 106 and backboard 112 is amplified after being converted to electric signal.The internal structure of this class condenser microphone is an example, and the utility model can be applied to the microphone of various structures.

As mentioned above, according to the utility model, under the situation of the screen cloth that execution and existing nonwoven fabrics identical function directly are set on the sound hole of housing, owing to need not to pasted nonwoven fabrics or additional sheet metal in housing in the outside of housing like that in the past, therefore, has the advantage that can shorten the microphone assembling procedure, reduce microphone thickness.Especially, under the situation of the inside of housing additional metal sheet, the additional metal sheet causes smoothness to descend, and causes various badly, and still, the assembly of condenser microphone of the present utility model need not sheet metal, therefore, has the good advantage of smoothness.

On the other hand, according to the utility model, the mode that vibrationproof and moistureproof unit 104 are set on the sound hole 102a of condenser microphone can adopt following several mode: the mode that forms a bigger sound hole on housing 102; In the mode that forms sound hole more than two on the housing 102 respectively; Perhaps, mode in formation sound hole etc. on the whole basal surface of housing 102.

Fig. 7 is of the present utility model at the example that is formed with the microphone case in sound hole more than two on the housing.

Referring to Fig. 7, utilizing micro-processing technology to make in the process of housing 302, on the 302a of sound hole, form minute aperture or screen cloth 304, flow into microphone inside to prevent outside dust or moisture etc. by sound hole 302a.Under the situation of Fig. 7, except the quantity in sound hole, other embodiment with the front is identical, therefore, and detailed.

Among the above embodiment, be that example is illustrated with columnar microphone, but this embodiment only, the utility model can directly apply in the microphone of other shapes such as microphone of polygonal shape.

Claims

1. a sound hole is provided with the condenser microphone of vibrationproof and moistureproof unit, this condenser microphone comprises the mechanical structure that is made of a pair of oscillating plate and backboard between housing and printed circuit board (PCB), described condenser microphone is characterised in that, an opening of described housing and form tubular by basal surface and sidewall, form sound hole on the described basal surface, be used in the described sound hole to prevent that vibrationproof that outside dust and moisture flow into and moistureproof unit and described housing from forming as one.

2. sound according to claim 1 hole is provided with the condenser microphone of vibrationproof and moistureproof unit, it is characterized in that, described vibrationproof and moistureproof unit are micropore or the screen clothes that is formed in the sound hole of described housing.

3. sound according to claim 2 hole is provided with the condenser microphone of vibrationproof and moistureproof unit, it is characterized in that described vibrationproof and moistureproof unit strengthen supporting force by support.

4. sound according to claim 1 hole is provided with the condenser microphone of vibrationproof and moistureproof unit, it is characterized in that, central authorities at described basal surface are formed with one or at least two described vibrationproof and moistureproof unit, and perhaps described vibrationproof and moistureproof unit are formed on the whole basal surface.