JP3748810B2 - Microphone - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a microphone used by being incorporated in a small device such as a mobile phone, a video camera, a digital camera, or a PC.
[0002]
[Prior art]
The conventional microphone 11 shown in FIG. 3 is an example of a so-called condenser microphone, and has a structure in which components are accommodated in a can-like case 1 such as aluminum, and the case 1 has a sound collecting hole 1a. The bottom part of the component is a circuit board 2 on which electric parts such as FET (3) are mounted. On the circuit board 2, a spacer A (4), a back electrode board 5, and a spacer B (6 The uppermost part is an annular diaphragm support frame 8 having a diaphragm 7 such as a metal thin plate joined to the lower surface.
[0003]
One of the structures in which such a microphone 11 is incorporated into a device such as a mobile phone is to provide a microphone room at the bottom or lid which is a part obtained by dividing the housing of the device so that the microphone 11 can be accommodated and stacked thereon. Then, the circuit board of the device is assembled, and the casing parts are combined and fixed by screwing or the like, so that the microphone 11 and the circuit board of the device are electrically connected. In that case, the microphone 11 is wrapped with a gasket, and a connector is provided and accommodated in the microphone chamber of the housing.
[0004]
FIG. 4 shows a connector in which a connector 12 is pressed against a lower part of a microphone 11 and a gasket 14 made of an elastomer material such as silicon rubber or urethane rubber is covered, and this is placed in a microphone chamber of a casing of a device. The connector 12 is an elastic connector in which thin gold wires are vertically aligned and inserted in silicon rubber or the like, or metal powder is dispersed and contained, and is anisotropic in the vertical direction and not in the horizontal direction. When electrically conductive and brought into contact with the circuit board of the device, the conductive pattern of the circuit board and a terminal electrode (not shown) on the lower surface of the circuit board 2 (FIG. 3) of the microphone 11 are conductively connected. The gasket 14 has a circular top surface and a sound collecting hole 14a. The gasket 14 conforms to the shape of the microphone chamber and has a buffering action, and acoustically seals the periphery of the diaphragm 7 (FIG. 3).
[0005]
FIG. 5 is another example in which the microphone 11 is wrapped with the connector 12 and the gasket 14, and FIG. 6 is an exploded perspective view thereof. The connector 12 is a resin molded product, with spring terminals 13 inserted therein. When these are housed in a housing together with the circuit board of the device, the spring terminals 13 come into contact with the conductive pattern of the circuit board, and the terminals on the lower surface of the microphone 11 The electrode and the circuit board of the device are electrically connected. Also in this conventional example, the outer periphery of the connector 12 and the gasket 14 is circular.
[0006]
[Problems to be solved by the invention]
Conventionally, in order to accommodate the microphone 11 in the casing of the device, as shown in FIGS. 4 and 5, the connector 12 is joined or assembled, and is housed in the casing. Since the connector 12 is necessary and the number of components increases, the electrical connection is in two stages: the microphone 11 and the connector 12, and the connector 12 and the circuit board of the device, which is disadvantageous in terms of connection reliability. The present invention proposes a microphone having a structure in which a connector 12 is not required and the number of components is reduced and a good electrical connection is obtained.
[0007]
[Means for Solving the Problems]
The present invention provides a leaf spring-like spring terminal that is electrically connected to the conductive pattern of the circuit board on the circuit board that forms the bottom of the microphone, so that when the microphone is housed in the housing of the device, one end of the spring terminal is It is designed to be in contact with the connection electrodes on the circuit board so that they can be made conductive, so that conventional connectors can be eliminated, and the microphone is directly connected to the circuit board of the equipment, and the reliability of electrical connection is also improved. improves.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a microphone 21 of the present invention, in which (A) and (B) are cross-sectional views, (C) is a bottom view, (A) is a cross-sectional view taken along line AA in (C), and (B) is (A). BB cross section. The outside is a can-like case 1, and a circuit board 22 made of glass-filled epoxy resin or the like is at the bottom, and electrical components and a diaphragm are accommodated in the case 1, but the internal structure is a conventional example. Since it is the same as that, description is abbreviate | omitted.
[0009]
As shown in FIG. 1, two spring terminals 23 having a shape obtained by bending a leaf spring are attached to the lower surface of the circuit board 22. The material of the spring terminal 23 is an elastic metal conductor such as phosphor bronze or beryllium copper. The spring terminal 23 is placed in the groove 22a on the lower surface of the circuit board 22 and has a fixed orientation. The circuit board 22 is provided with a through hole 22 b, and the conductive coating on the inner surface is connected to the conductive pattern on the upper surface of the circuit board 22. The convex portion 23a formed by bending the middle of the spring terminal 23 is pushed into the through hole 22b and fixed to the circuit board 22, and the contact pressure between the convex portion 23a and the conductive coating on the inner surface of the through hole 22b The conductive pattern is made conductive.
[0010]
The grooves 22a of the circuit board 22 are formed by cutting with a cutter or by laminating a flat board without grooves and a board with grooves. Usually, the spring terminal 23 can obtain a sufficient fixing force simply by pushing the convex portion 23a into the through hole 22b. However, if the spring terminal 23 is soldered to a land portion around the through hole 22b, the fixing strength is further increased.
[0011]
FIG. 2 shows a state in which such a microphone 21 is incorporated in a device such as a mobile phone. A microphone 21 fitted with a gasket 14 is accommodated in a microphone chamber 25a of a housing 25 of the device. The gasket 14 is a simple one having a square hole into which the microphone 21 is inserted at the center of a circular elastomer. Thereby, the spring terminal 23 contacts the conductive pattern of the circuit board 24 of the device, and the microphone 21 and the electrical circuit of the device are connected. In addition, although the external shape of the microphone 21 shown in the embodiment is a square, the external shape is not limited to this, and may be circular.
[0012]
【The invention's effect】
As described above, according to the present invention, a microphone having a spring terminal can be obtained, and a separate connector as in the prior art becomes unnecessary. This reduces the number of parts required to incorporate the microphone into the device, reduces costs, and facilitates management of the parts. There is no need to assemble the connector, and the assembly man-hours are reduced. In terms of quality, there are many effects such as simplified structure and improved reliability of electrical connection.
[Brief description of the drawings]
1A is a front cross-sectional view, FIG. 1B is a right cross-sectional view, FIG. 1C is a bottom view, and FIG. 1A is a cross-sectional view taken along line AA in FIG. Is a BB cross section of (A).
2 is a cross-sectional view showing a state in which the microphone of FIG. 1 is incorporated in a housing of a device.
FIG. 3 is a cross-sectional view of an example of a conventional microphone.
FIG. 4 is a cross-sectional view showing a state in which a gasket and a connector are assembled to a conventional microphone.
FIG. 5 is another cross-sectional view showing a state in which a gasket and a connector are assembled to a conventional microphone.
6 is an exploded perspective view of each component in FIG. 5;
[Explanation of symbols]
1 Case 2 Circuit board 3 FET
4 Spacer A
5 Back electrode substrate 6 Spacer B
7 diaphragm 8 diaphragm supporting frame 11 microphone 12 connector 13 spring terminal 14 gasket 21 microphone 22 circuit board 22b through hole 23 spring terminals 23a protrusion 24 circuit board 25 housing

Claims (3)

A circuit board that forms the bottom of the microphone is provided with a through hole connected to the conductive pattern, and a groove is provided on the lower surface of the circuit board.
A spring terminal made of an elastic metal and provided with a convex portion in a part is placed in the groove of the circuit board to determine the orientation, and the convex portion is pushed into a through hole of the circuit board to fix the spring terminal to the circuit board. In addition, the microphone is electrically connected to a circuit board. The microphone according to claim 1,
The microphone is characterized in that the circuit board is formed by providing a groove on the lower surface of a single-layer board, or a laminated body of a board without a groove and a board with a groove. The microphone according to claim 1,
The microphone is characterized in that the spring terminal is fixed by pressing the convex portion into the through hole of the circuit board and soldering.

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