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JPS61247199

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DESCRIPTION JPS61247199
[0001]
FIELD OF THE INVENTION This invention relates to electret condenser microphones. Prior Art
FIG. 6 is a cross-sectional view of a conventional electret condenser microphone. In FIG. 6, 1 is a
cloth, 2 is a cylindrical metal case having a sound hole 2a on the top surface, 3 is a film formed
by uniformly stretching a diaphragm 4 made of an electret material having a metal surface by
metal deposition or the like. Reference numeral 5 denotes a gap spacer, 6 denotes a fixed
electrode, 6a denotes a damping hole, 7 denotes a wedge-shaped insulator, 8 denotes an FET N
8a an input lead, 8b an output lead, and 9 a printed circuit board. The output lead 8b is fixed to
the printed circuit board 9 by the soldered portion 9a. In the present description, a wheel electret
type using an electret material for the vibrating membrane 4 is taken as an example, but the
same applies to a pack electret type where an electret material is provided on the fixed electrode
6 side. The fixed electrode 6, the insulator 7, the FET 8, and the printed circuit board 9 can be
considered as one amplifier block 10, and the above-described components are fixed to the metal
case 2 by the caulking portion 2b after being inserted. FIG. 7 illustrates the assembly of the
amplifier block lO. The input lead 8a of the FET 8 is electrically connected to the fixed electrode
6 by spot welding or contact. In the latter case, the fixed electrode 6 is fixed to the insulator 7 by
press fitting or the like. If the electret condenser microphone constructed as described in FIG. 7
has more than the problems to be solved by the invention, as shown in FIG. 7, the amplifier block
10 consists of 4 parts, the film ring 3 and the gap spacer 5 are metal cases While this amplifier
block is a separate process, it is difficult to assemble, and there is a drawback that the operation
rate is reduced even if it is automated. An object of the present invention is to provide an electret
condenser microphone which eliminates the above-mentioned drawbacks and simplifies the
assembly. Means for Solving the Problems In order to achieve the above object, the present
invention separates the fixed electrode from the amplifier block by providing the insulator with a
tapered convex portion for fixing the position of the fixed electrode. The film ring and gap spacer
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1
are dropped into the case. Therefore, according to the present invention, the number of parts of
the amplifier block can be reduced, so that the construction and assembly can be simplified.
Embodiment The configuration of an embodiment of the present invention will be described
below with reference to the drawings. FIG. 1 is a cross-sectional view showing an embodiment of
the present invention, and the same parts as FIG. 6 are indicated by the same reference numerals.
In FIG. 1, the difference with FIG. 6 is that a bank portion 17a having a taper is provided in the
vicinity of the upper end outer peripheral portion of the insulator 17. As shown in FIG. 17 and 3
points of the printed circuit board 9. The fixed electrode 6 is configured to be dropped into the
metal case 2 together with the membrane ring 3, the vibrating membrane 4 and the gap spacer 5
as shown in FIG. 3, and then the amplifier block 10 'is inserted. In this case, since the insulator
17 has the bank portion 17a having a taper, the fixed electrode 6 can be fixed in position, and
the insulation with the metal case 2 can be surely performed. The input lead of the FET 8 is
sandwiched between the insulator 17 and the fixed electrode 60, and is conducted by contact or
the like. FIG. 4 is another embodiment of the present invention. In the case of FIG. 4, it is an
example at the time of comprising the fixed electrode 6 in the sound hole 2a side. FIG. 5
illustrates the assembly in FIG. 4. In this case, the tapered portion 17a of the insulator 17 fixes
the position of the film ring 3, and the input lead 8a of the FET 8 is the insulator 17 and the film.
It is configured to be inserted between the rings 3 and to conduct electricity. As described above,
according to the present invention, the amplifier block has three points: insulator, FET, and
printed circuit board, and can be reduced by one point from the conventional example, so that
the assembly of this block is easier than in the prior art and automatic assembly Even in the case
of environmental protection, it leads to an improvement in the operating rate. That is, in the case
of the present invention, it is possible to provide an inexpensive electret condenser microphone
which is suitable for mass production.
[0002]
Brief description of the drawings
[0003]
1 is a sectional view showing an electret condenser microphone in one embodiment of the
present invention, FIG. 2 is an exploded sectional view showing an assembly of the amplifier
block in FIG. 1, and FIG. 3 is a whole assembly process in FIG. 4 is a sectional view showing
another embodiment of the present invention, FIG. 5 is an exploded view showing the whole
assembly process in FIG. 4, FIG. 6 is a sectional view of a conventional electret condenser
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microphone, FIG. 7 is an exploded sectional view showing the assembly of the amplifier block in
FIG.
2ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии
и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и fixed electrode, 8... FET. Name of Agent Attorney Nakao
Toshio et al. 1 person 2QQ 3 Figure 4 Figure 5 Figure 5 llls Figure 7
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