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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a conventional
electroacoustic transducer, and FIG. 3 is a cross-sectional view of an embodiment of the present
invention. 11 ··· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · vibrating membrane, 15 · · · ·.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrostatic
electroacoustic transducer using an electret, and it is an object of the present invention to
provide a highly stable and structured transducer. In the prior art, as shown in FIG. 1, the electric
sound feeding R converter 7 uses the peristaltic membrane (1) K electret, or as shown in FIG. 2
uses the electret for the fixed electrode (6). It is clear. In Fig. 1, the inner electrode (4) (11 ゞ 1 ゞ
"> ゞ 1 二 3 4 4) is used to squeeze the circumference by the vibrating film illFi facing ring (2). In
the dark of the film (11 and the fixed electrode (4)), a gap is formed by the interposition of the
space 3+. In # t2, the fixed electrode 161 has a surface layer film +71 made of electret, and the
vibrating film (8) is fixed to the collar (6) by the internal ring (9). A spacer (a gap is formed by
interposing an ILI) between the vibrating membrane (8) and the fixation @. In -IVC of FIG. 1, the
conversion principle as a sneaker is described. 6 IID D + film (1) is an electret, so that the fixed
tit, * (41 is powered on the surface of 撫 5- (1) '[[an electrical angle of the opposite sign is
induced and The electrostatic absorption 11 power is generated in the dark with the fixed @@ +
41. Now, when an alternating current is applied to the fixed electrode (4) and pressure is applied,
the suction force between the vibrating membrane (1) and the fixed [檜 (4) changes. As a result,
the vibration m (1) vibrates and generates a sound. In the example of FIG. 2, the electric sound
box conversion is performed according to the same principle. In the prior art shown in FIGS. 1
and 2, the suction force between the vibrating membrane (1) (8) and the fixed electrode + 41 +
61 is equal to the square of the distance of the gap. In this case, the moving film (1) (8) adsorbs
the fixed portion to 祿 t 41 161 and stops, and electroacoustic conversion becomes impossible.
In addition, even if 1 I 1 -1 gap is large, abnormal force works on the shooting button fll + 8) due
to the sudden change of ii U and barometric pressure, and the single pregnancy movement
Sumoyama (8) is constant power! If it is absorbed by 41 + 61, it will often remain adsorbed
regardless of its original state. Thus, with this type of transducer, the gap 11.1. ・ One
characteristic of tension of the membrane is required to be large, which makes the cost
expensive, and there is a problem with Italy + a 註. The present invention eliminates such a
problem. An embodiment of the present invention will be described below based on FIG. 1111 is
fixed 1! It is a cocoon, and has a surface film a made of electret on the surface.
) 13 is an imaging film composed of electrets, and the fixation is superimposed on the '11', and
the peripheral edge portion is formed by an annular fixing ridge. The battery case is fixed to 11).
The diaphragm (11) and the surface N film + 1Z are layered in the same inertia, and between the
middle portions of the vibrating olfactory 11 and the surface film 12 both 11! A gap 061 is
provided which is held by the repulsive force by a force of 111 □ l Iz) a lead wire connected to
the flume film 13 via the v'i matching ring a4, U γ (3) "I'-one," is a lead wire connected to the
fixed battery case (II). With such a configuration, the distance between the photographing 1 [+4
and the fixed 1M 檜 111) by applying an AC voltage to the fixed film (111) via the lead wire: 1m
++ 71. The repulsive force changes, and as a result, the vibration 111 + III 113 'vibrates and a
sound is generated. Since aa * u: i and the surface layer 112 of the fixed market 11 have the
same polarity, as the vibration -113 and the table 1-pus 112 approach, the repulsive force
increases 1 ev), and the stratification phenomenon occurs. Absent. For this reason, the stability is
excellent, and the high accuracy as in the conventional case is not required for the latitudinal
barrier til + ', and therefore, it can be manufactured easily at 11I + 1. In the above-mentioned
embodiment-, although the case of using a slider is described in a, the same effect is obtained
also when using a microphone. As described above, according to the present invention, there is
no problem of adsorption between the siding board and li1 fixed tortoise and the stability is high.
And, it is possible to provide a simple converter of a structure that does not require high
precision in the gap between the diaphragm and the fixed electrode.