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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing an example of a
conventional condenser microphone, FIG. 2 is an enlarged cross-sectional view of a part thereof,
FIG. 3 is an equivalent circuit diagram, and FIG. FIG. 5 is a partially cutaway perspective view
showing the relationship between the diaphragm ring and the diaphragm. 3 is a diaphragm ring,
6 is a back plate, 8 is a diaphragm ring body, 9, 10 and 11 are conductive layers.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a condenser
microphone, and in particular to improve the sensitivity as a microphone by minimizing
unnecessary stray capacitance formed in the microphone capsule. A condenser microphone
according to the present invention will be described (1) 101b / i, i4; y-). First, an example of a
conventional condenser microphone of this type will be described with reference to FIG. 1 to FIG.
The fil is a case made of metal or conductive material, and is formed in a cylindrical shape. (2) is
a diaphragm ring, which is formed of a metal material such as copper. (3) is a diaphragm, which
is formed of a resin material. (4) is a good conductive layer deposited on the upper surface of the
diaphragm (3) and is usually formed by electroless plating on the diaphragm (3). (5) is a ringshaped spacer formed of an electrically insulating material, (6) is a pack plate opposed to the
diaphragm (3) through the spacer (5), and is formed of a metal material- The pack plate (6) is
formed to be sufficiently smaller than the inner periphery of the case + 11, ie, the diameter of the
diaphragm ring (2) so as not to brush the case ft 1-(7) It is formed of an insulating material. In
this manner, a mass, ie, a capacitor is formed between the diaphragm (3) (in this case, the
conductive layer (4)) and the puncture plate (6), and the DC power supply tube is connected
externally The microphone (2) 101 '/ "is used as it is. Alternatively, in the case of a so-called
electret microphone, the external power supply is omitted by electretizing the diaphragm (3) or
attaching the electretized resin film to the pack plate (6). When the diaphragm (3) is electretized,
it is well known that the above-mentioned conductive layer (4) can be omitted. As described
above, in this type of microphone, the diaphragm (3) and the pack plate (6) Although a capacity
((0) is formed between them, in addition, it is possible to form a capacity ((C1)) also between the
diaphragm 7 (2) and the pack plate (6). FIG. 3a is an equivalent circuit of this condenser
microphone, where e is an electromotive force source. In the conventional condenser
microphone, as is apparent from FIG. 2, the inner peripheral portion of the diaphragm ring (2)
and the outside air portion of the nine-plate (6) face each other (face up). Therefore, the abovementioned volume IC1 is relatively large.
And this capacitance C1 is not necessary for the movement as a so-called small condenser
microphone (3) J (Mr. Loss, that is, the sensitivity decreases. In view of these points, the present
invention provides a condenser microphone in which the above-mentioned stray capacitance C1
is made as small as possible. FIG. The same reference numerals as in FIG. 2 denote the same parts
as in FIG. That is, in the present invention, a pair of the ring body (8) in which the dia 7 ram ring
(21 is formed in a ring shape with an insulating material (for example, synthetic resin) and the
diaphragm (3) of the ring body (8) A turtle comprising a conductive layer (9) deposited on the
surface on the contact side, a conductive layer 0 deposited on the opposite noble surface, and a
conductive layer (a layer electrically connecting both grooves 9 and the axis) It is not necessary
to provide the connecting conductive layer αυ on the entire surface of the ring body (8) in the
direction of the outer periphery, but it is sufficient if it is provided at a plurality of places. The
part shown by a dotted line in FIG. 5 is this connection part. And in the present invention, it is
clear from FIG. 4 (4) that the conductive layer (9) should not face each other, ie, not face each
other, as far as possible. The W shown in FIG. 4 is formed so that it can be picked up as a dog. W
is the difference between the radius tt1 formed by the inner peripheral edge of the conductive
layer (9) and the radius R2 formed by the outer peripheral edge of the back plate (6), that is, w =
R, -2. According to the present invention described above, since the diaphragm (2), which has
conventionally been faced to the bank plate 16), can be configured in a shape that does not face
in a straight line when viewed from the electric point of view, Unfavorable df between the
relatively large 8k diacram ring (2) and the back plate (6), that is, ff t which can make the floating
81 Ct described in FIG. 3 sufficiently small. Therefore, it has a feature that can increase its
sensitivity as a microphone. Along with this, as shown in FIG. 5, the guiding ill 4141 of the dive
fram (3) t is shown by the symbols (4 d) and (4 b) to be separately attached to the central portion
and the outer peripheral portion of the diaphragm j31. (5) 1 (J, I1,... (Town), which are
electrically connected to each other by four turtle layers (4C) deposited and formed at a number
a. Incidentally, the conductive 1 → (4a) in the central part is held by the portion where the
diaphragm (3) actually exerts its effect (this is the outer peripheral edge of the diaphragm (3), ie
the spacer j5) and the ring (2) Should be provided only at 90% of the 80'16) of the part excluding
the part, and the conductive layer (4b) on the outer peripheral part should be in direct contact
with the conductive 4t91 deposited on the diaphragm ring body (8) It is good to form.
As a result, the 4-i 1114 (4a) and (4b) do not form a so-called electrode, so that the
conventionally used capacity between this part and the back plate 16) disappears, and this part
Oh, it is almost irrelevant to the operation as a microphone, so it is possible to remove more
disturbing capacity than it is, that is, it will be a configuration with only the unreasonable
volume-so Reno sensitivity? t4めることかでさる。
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description, jps57106400
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