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JPS61232800

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DESCRIPTION JPS61232800
[0001]
FIELD OF THE INVENTION This invention relates to electret condenser microphones. Prior Art
FIG. 3 shows a cross-sectional view of a conventional electret condenser microphone. The
configuration of this conventional example will be described below with reference to FIG. In FIG.
3, 1 is a planar phase, 2 is a cylindrical metal case having a sound hole 2a on the top surface, 3 is
a film formed by uniformly stretching a vibrating film 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 having a hole 6a, 7 denotes an insulator, 8 denotes a FET, 9 denotes a
printed circuit board, and 10 denotes a capacitor gap. The fixed electrode 6, the insulator 7, the
FET 8, and the printed circuit board 9 can be considered as one amplifier block, and the abovedescribed components are fixed to the metal case 2 by the caulking portion 2b after being
inserted into the metal case 2. In the conventional electret condenser microphone configured as
described above, since the capacitor gap lθ is formed by the gap spacer 5, the number of parts is
increased, and in general, the gap spacer 5 In order to reduce the size, and from the sensitivity
level, an insulating spacer such as polyethylene film of about several tens of μm is used.
Therefore, since it is light and easily affected by static electricity or the like, it is easy to cause an
error, etc. in the number of inserted sheets << at the time of assembly. In other words, it has the
disadvantage that it is not suitable for mass production due to automatic assembly machines and
the like. SUMMARY OF THE INVENTION The present invention is intended to eliminate the
drawbacks of the prior art and to provide an electret condenser microphone suitable for mass
production. Means for Solving the Problems In order to achieve the above object, according to
the present invention, a convex portion is provided on both sides of the fixed electrode, and the
vibrating membrane is raised by the convex portion to obtain a capacitor regardless of the front
and back of the fixed electrode. It constitutes the gap. Therefore, according to the present
invention, it is possible to form a capacitor gap without using a gap spacer and to assemble
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without considering the front and back of the fixed electrode. Embodiment The configuration of
an embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 is a sectional view, and the same parts as FIG. 3 are indicated by the same reference
numerals. In FIG. 1, it is conventional. (The point that the gap film 5 has one or a plurality of
projections 6b on both sides of the fixed electrode 6, and the projections 6b make up the
diaphragm 4 to form a capacitor gap 10). It is.
FIG. 2 shows a perspective view of the fixed electrode 6. The convex portions 6 b are formed on
both surfaces of the fixed electrode 6 in order to form the capacitor gap IO regardless of the
front and back of the fixed electrode 6, which facilitates the assembly and can improve the
productivity. It is desirable that the shape, configuration, and the like of the convex portion 6b be
provided substantially the same on the front and back so as to reduce variations in sensitivity,
frequency characteristics, and the like. Further, in order to reduce changes in sensitivity,
frequency characteristics and the like due to environmental conditions and the like, it is
preferable to provide a plurality of electrodes near the outer periphery rather than near the
center of the fixed electrode 6. Although one or more convex portions 6b are provided in the
present embodiment, it is needless to say that the same effect as the present invention can be
obtained by providing them in a ring shape or the like. Effect of the Invention As described
above, according to the present invention, since the gap spacer is not required and one or a
plurality of convex portions are provided on both sides of the fixed electrode, it is not necessary
to separate the front and back of the fixed electrode. You can configure the gap. Therefore, it has
the advantage of being able to improve the mass productivity of an automatic assembly machine
etc. without impairing the assemblability.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a sectional view of an electret condenser microphone according to an embodiment of the
present invention, FIG. 2 is a perspective view of a fixed electrode in FIG. 1, and FIG. 3 is a
sectional view of a conventional electret condenser microphone.
2 · · · · · · · · · Metal case, 3 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · fixed electrode, 6b · · · · · ·
· · · convex part.
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