KR200220630Y1 - A condencer microphone - Google Patents

Abstract

The present invention relates to a condenser microphone for converting sound pressure, which is acoustic energy, into electrical energy.

The present invention has a case having a through-hole formed in the center to pass sound, a conductive member provided inside the through-hole formed in the case, and the air gap of a predetermined gap inside the conductive member is installed to the sound signal as an electrical signal A pole ring concentrically installed in the case so as to transmit a polyethylene terephthalate film to be converted, and an acoustic signal converted into an electrical signal by the air gap and the polyethylene terephthalate film to a gate electrode of a field effect transistor mounted on a printed circuit board; And an insulating ring installed on the inner circumferential surface of the case to insulate the pole ring from the case.

Therefore, the present invention is simple in structure, can be made thin and small, and at the same time, the input terminals of the printed circuit board and the amplification element have good electrical conductivity, and the input terminals of the printed circuit board and the amplification element Since the electrical conductivity is good, noise can be easily removed, and the production yield can be improved, thereby reducing the manufacturing cost.

Description

Condenser Microphone {A CONDENCER MICROPHONE}

The present invention relates to a condenser microphone for converting sound pressure, which is acoustic energy, into electrical energy.

As a condenser microphone used for attaching a microphone, a telephone, a mobile phone, a video tape recorder, a toy, and the like to convert a sound pressure into an electrical signal, the applicant filed a patent application on December 22, 1990 and registered on April 17, 1993. Korean Patent Publication No. 1993-6363.

As shown in detail in FIG. 1, the condenser microphone disclosed in the publication has a pole ring formed in a case 3 having a through hole 1 formed in a lower center thereof, and a cover 2 attached thereto. 4) and the vibrating membrane 5 are mounted, the amplifier 9 is fixed to the circuit board 12 by soldering 13, and the output line 11 of the amplifier 9 is connected to the circuit board 12. In the condenser microphone cartridge connected by soldering, the fixed electrode 16 which is connected to the input terminal 10 of the amplifying element 9 and insulated by the insulating ring 17 is mounted on the vibrating membrane 5. In addition, a dielectric plate 20 coated with an electrostatic material is provided inside the fixed electrode 16, and a plurality of through holes 21 are formed at the outer circumference of the fixed electrode 16.

However, the conventional condenser microphone configured as described above has a dielectric inside the fixed electrode 16 in a state in which the fixed electrode 16 insulated from the case 3 by the insulating ring 17 is directly connected to the vibrating membrane 5. Since the plate 20 is separately bonded, the vibrating membrane 5 can be made thinner, so that the frequency characteristic can be improved, and the dielectric plate 20 is formed separately from the vibrating membrane 5, so that the dielectric plate ( 20) can be made larger, so that the performance of the condenser microphone can be remarkably improved by increasing the electrostatic holding capacity, and a plurality of through holes 21 are formed on the outer periphery of the fixed electrode 16. Although the directivity and frequency characteristics can be adjusted, the contact area between the input terminal of the amplifying element 9 and the fixed electrode 16 is narrow, resulting in a poor electrical contact, and thus the production yield cannot be improved. This can, and diminish the yield, there is a problem in that manufacturing cost is increased, and therefore bad electrical contact there were various problems such that not only can not the noise is removed, reduced in size.

Accordingly, the present invention has been made to solve the various problems described above, and an object of the present invention is to provide a thinner and miniaturized condenser microphone.

Another object of the present invention is to provide a condenser microphone in which an input terminal of a printed circuit board and an amplifying element can be electrically conductively contacted.

Another object of the present invention is to provide a condenser microphone which can reduce the manufacturing cost by improving the production yield.

Still another object of the present invention is to provide a condenser microphone which can accurately convert an acoustic signal into an electrical signal and can easily remove noise.

In order to achieve the above object, the condenser microphone according to the present invention has a case having a through hole formed to pass sound in the center, a conductive member installed inside the through hole formed in the case, and a constant gap inside the conductive member. A polyethylene terephthalate film provided with an air gap and converting an acoustic signal into an electrical signal, and a gate electrode of a field effect transistor mounted on a printed circuit board with an acoustic signal converted into an electrical signal by the air gap and polyethylene terephthalate film. The pole ring is provided concentrically in the case so as to be transmitted to the case, and the insulating ring is provided on the inner peripheral surface of the case to insulate the pole ring and the case.

1 is a longitudinal sectional view schematically showing a conventional condenser microphone;

2 is a schematic longitudinal sectional view of a condenser microphone according to an embodiment of the present invention;

3 is a bottom view of FIG. 2;

4 is an enlarged cross-sectional view of a portion A in FIG. 2;

FIG. 5 is an enlarged cross-sectional view of part B of FIG. 2.

<Explanation of symbols for the main parts of the drawings>

100: case 100a: through

107: polyethylene terephthalate film

107a: Au deposition layer 113: insulation ring

116: field effect transistor 116a: gate electrode

116b: drain electrode 116c: source electrode

120: conductive member 120a: through hole

122: Cu thin plate 124, 125: nickel plated layer

127: fluoroethylene propylene film 130: printed circuit board

130a: + electrode 130b:-electrode

132: epoxy base 134, 135: Cu coating layer

136,137: Au coating layer 140: Lead wire

150: pole ring 150a: through hole

Hereinafter, a condenser microphone according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Figure 2 is a schematic longitudinal sectional view of a condenser microphone according to an embodiment of the present invention, Figure 3 is a bottom view of Figure 2, Figure 4 is an enlarged cross-sectional view of the portion A in Figure 2, Figure 5 2 is an enlarged cross-sectional view of a portion B. FIG.

2 to 5, the case 100 of the condenser microphone according to the present invention is plated with Au on its surface to have good conductivity, and a through hole 100a through which sound passes in the center is formed. On the other side is open.

A conductive member 120 having a plurality of through holes 120a is abutted on the inner side where the through hole 100a of the case 100 is formed, and an air gap 109 of a predetermined gap is provided below the conductive member 120. A polyethylene terephtalate film 107 having an Au deposition layer 107a on which Au is deposited by sputtering on the outer surface is provided.

In addition, a ring-shaped insulating ring 113 is provided on an inner circumferential surface of the case 100 so as to electrically insulate the case 100 from the conductive member 120, and inside the insulating ring 113. A cylindrical pole ring 150 is provided concentrically with respect to the case 100.

The printed circuit board 130 on which the field effect transistor 116 is installed is electrically connected to the gate electrode 116a of the field effect transistor 116 via the pole ring 150 under the pole ring 150. It is.

The opening of the case 100 is formed to electrically conduct the gate electrode 116a and the pole ring 150 of the field effect transistor 116 installed on the printed circuit board 130 via the pole ring 150. At the same time, the cylindrical pole ring 150 is provided to increase the gate electrode 116a and the conductive area of the field effect transistor 116.

The pole ring 150 is formed of a cylindrical body, is made of a conductor, and the through hole 150a in the center thereof is formed so as to extend in diameter toward the back side (specifically, the printed circuit board 130 side).

In the above description, the conductive member 120 includes a Cu thin plate 122, nickel plated layers 124 and 125 plated on both surfaces of the Cu thin plate 122 to increase conductivity, as shown in FIG. It is composed of a fluorine ethylene propylene (Fluoline Ethylene Propylene) film 127 attached to the nickel plated layer 124 and has a charge when it is charged with electricity.

The printed circuit board 130 may include an epoxy base 132 of an insulating material, Cu coating layers 134 and 135 attached to both surfaces of the epoxy base 132, and to increase conductivity, as shown in FIG. 5. It is composed of Au coating layers 136 and 137 deposited on the Cu coating layers 134 and 135.

In the above description, the polyethylene terephthalate film 107 having the pole ring 150 and the Au deposition layer 107a and the air gap 109 constitute a diaphragm for converting sound pressure into an electrical signal.

In FIG. 3, 116b is a drain electrode of the field effect transistor 116, 116c is a source electrode of the field effect transistor 116, 130a is a + electrode formed in a pattern on the printed circuit board 130, 130b is a -electrode formed in a pattern on the printed circuit board 130, and 140 is a lead wire electrically connecting the -electrode formed in a pattern to the printed circuit board 130 and the case 100.

Next, the operation and effects of the condenser microphone according to the embodiment of the present invention configured as described above will be described.

The assembly method of the condenser microphone of the present invention configured as described above will be described.

First, the conductive member 120 having a plurality of through holes 120a is placed through the opening of the case 100 while the case 100 is turned upside down, and an air gap of a predetermined gap is formed on the conductive member 120. 109 is placed, and the polyethylene terephthalate film 107 is placed by an adhesive.

At this time, the Au deposition layer 107a laminated on the polyethylene terephthalate film 107 is placed to face downward in FIG. 2.

Next, the insulating ring 113 is inserted into the inner circumferential surface of the case 100, and the pole ring 150 is inserted into the insulation ring 120 concentrically with the case 100, and then the pole ring 150 is installed. After placing the printed circuit board 130 having the field effect transistor 116 on it, the edge of the opening of the case 100 is grooved to mount the field effect transistor 116 mounted on the printed circuit board 130. The gate electrode 116a is electrically connected to the pole ring 150 through a pattern formed on the printed circuit board 130.

When the condenser microphone of the present invention is assembled as described above, the gate electrode 116a of the field effect transistor 116 soldered to the pattern formed on the printed circuit board 130 and the pole ring 150 are in electrical contact with each other. The contact area is increased, and the acoustic energy that enters through the through hole 100a of the case 100 is converted into electrical energy, so that some flows into the case 100 through the conductive member 120 and is grounded and extinguished. The remaining electrical energy signal converted through the through hole (100a) of the 100 into electrical energy is a condenser is configured by the conductive member 120 and the pole ring 150, the pole ring 150 and the printed circuit board ( Since it is applied to the gate electrode of the field effect transistor 116 through the pattern (not shown) of 130, the field effect transistor 116 is amplified to a predetermined level and output.

In the above description, the outer surface of the polyethylene terephthalate film 107, the upper surface in Fig. 2 has an Au deposition layer 107a in which Au is deposited by sputtering, so that the electrical conductivity is good, Nickel plated layers 124 and 125 are plated on both surfaces of the conductive member 120, so that the conductivity is good, and on the nickel plated layers 124 and 125, the fluoroethylene propylene film 127 has a charge permanently when charged with electricity. Sound can be more easily converted into electrical signals.

Therefore, since the pole ring 150 of the condenser microphone of the present invention also serves as a cylindrical electrode, the number of parts can be reduced, thereby simplifying the structure, making it thin, miniaturizing, printed circuit boards and amplifying elements. The input terminal of can be electrically contacted with good electrical conductivity can easily remove the noise, and the production yield can be improved to reduce the manufacturing cost.

In the above description, specific embodiments have been described by way of example, but the present invention is not limited thereto, and for example, various modifications may be made by those skilled in the art without departing from the concept of the present invention. Of course, the design can be changed.

As described above, according to the condenser microphone according to the present invention, a case having a through hole formed to pass sound in the center, a conductive member installed inside the through hole formed in the case, and air having a predetermined gap inside the conductive member. A polyethylene terephthalate film provided with a gap to convert an acoustic signal into an electrical signal, and an acoustic signal converted into an electrical signal by the air gap and the polyethylene terephthalate film on a gate electrode of a field effect transistor mounted on a printed circuit board. It consists of a pole ring installed concentrically in the case to transmit, and an insulation ring provided on the inner circumferential surface of the case to insulate the pole ring from the case, so that the structure is simple, thin and small, and a printed circuit board And the input terminal of the amplifier In addition to good electrical contact, the input terminals of the printed circuit board and the amplification element are electrically conductive, which makes it easy to remove noise, and the production yield is improved to reduce manufacturing costs. It works.

Claims (3)

A case 100 having a through hole 100a formed to pass sound in the center, a conductive member 120 installed inside the through hole 100a formed in the case 100, and a inside of the conductive member 120. Polyethylene terephthalate film 107 which is provided with an air gap 109 of a predetermined gap and converts an acoustic signal into an electrical signal, and is converted into an electrical signal by the air gap 109 and polyethylene terephthalate film 107 A pole ring 150 concentrically installed in the case 100 to transmit an acoustic signal to the gate electrode 116a of the field effect transistor 116 mounted on the printed circuit board 130, and the pole ring 150 and the case. A condenser microphone, comprising: an insulating ring (113) provided on an inner circumferential surface of the case (100) to insulate (100). The method of claim 1, wherein the pole ring 150, polyethylene terephthalate film 107 and the air gap 109 constitute a diaphragm for converting a sound pressure into an electrical signal, laminated on the polyethylene terephthalate film 107 Condenser microphone, characterized in that the Au deposition layer (107a) is disposed toward the pole ring 150 side. The method of claim 1, wherein the conductive member 120 is a thin Cu plate 122, a nickel plated layer (124, 125) plated on both surfaces of the Cu thin plate 122 to increase the conductivity, and the nickel plated layer (124, 125) A condenser microphone, comprising: a fluoroethylene propylene film 127 attached to and charged with electricity.