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JPS49134137

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DESCRIPTION JPS49134137
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a conventional
electrostatic electroacoustic transducer, and FIG. 2 is a cross-sectional view of an electrostatic
electroacoustic transducer in an embodiment of the present invention. 1 ··· · · · · · · · · · · · · · · · · · · · ·
····················································································1
voice layer. Figure 1 Figure 2 Figure 1 89-
DETAILED DESCRIPTION OF THE INVENTION The present invention is a single-type electrostatic
electroacoustic transducer Kll comprising an electret, a round back ml measuring pole, and a
piece of metal 11 layer layer ***. It is First of all, this type of electrostatic electroacoustic change
of this kind! ll11! Will be described together with llN1-. 1m1 Figure KJP, 1 is a back fixed
type -1a where a large number of holes 2 necessary for acoustic radiation are formed, this is a
layer with 111 layers on one side of oitIM constant power @ 10--2-adhesion by coating etc.
Polarized (electretized) good electret, 4 is a piece of plastic film piece 1cJI conductive layer 6 is
formed, 9m-16 is a thin film interposed between the outer periphery of the electret 3 and the
above-mentioned #b film 4 7 is an air layer provided on the electret 31 I 41 by means of an extra
base f 6, and 8 supports the back fixed electrode 1, the electleft 3, the vane 6 and the outer
peripheral part of the diaphragm 4 integrally. Supporting frame, the fixed type l1i1, the electret
3, l! One shelf no-condenser t is constructed by 111M4, x @ pe + @ IIC. 9 is a signal, and when
the signal from t1 No. # 9 is applied to the threshold between the back fixed electrode 1 and the
conductive layer 6, the vibration -8114 emits a large amount of noise according to the O signal.
It is a thing. However, as shown in the 11th ill, the above-mentioned conventional electrostatic
electroacoustic transducer is provided in the vibro-knitted 40 one-piece, and the good
conductivity 46 is provided on the back constant electrode 1. Since the plastic film is 111 m with
plastic film interposed between the conductive layer 6 and the electrets 3 and 13 @, and the
plastic film is electrically conductive 3, this plastic film causes the charge of the electret 3 to
cause sensitivity s There is a drawback that 'a' has occurred, and such a charge adsorption
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structure has a drawback that it is impossible to obtain the initial sensitivity by sweeping the DC
electric field by the electret. Further, in the above-mentioned conventional converter, since the
conductive N6 on one side of the one-acting film 4 is on the radiation iiy side, it deteriorates from
outside by IDal [medium aeration], and the effective area where the conduction force fljP and
electrostatic force work is true. A little bit of flawed sensitivity resulted. In particular, aluminum,
zinc, tin @ omit layers are susceptible to moisture, and nickel, titanium, gold and the like are
disadvantageous in that their mass productivity is inferior and their cost is high. The present
invention provides an electrostatic electroacoustic transducer at which the above-mentioned
conventional defects can be eliminated, and the same reference numerals as in FIG. I will explain
it with Fig.2.
As shown in the twenty-fourth aspect of the present invention, the conductor according to the
present invention has the conductive layer 6 provided with the piece 1Wc of the vibrating
member 4 disposed on the constant electrode 1 and disposed so as to face the Rue electret 3 It is
As the plastic 74 frame used for the vibration IE 4, mylar (* product name), polypropylene,
polyimide teflon, etc., which can be easily aluminum-plated can be used. The electrostatic
electroacoustic transducer of the present invention is configured as described above, and
according to the present invention, the following effects can be obtained. (1) A plastic film does
not intervene between the vapor-deposited conductive layer and the electret as in the
conventional example. Since the vapor deposition conductive layer provided on the second
vibrator 11 does not emit radiation [1 IKll, deterioration of the vapor deposition conductive layer
against warm air can be prevented. (3) In the conventional example, 9 * Va plastic film, air layer
electret) K partial pressure is applied between the conductive layer and the constant electrode,
and 9 OK is made according to the present invention because it is divided into the air layer and
the electret. There is an advantage 1 that the sound pressure sensitivity can be increased. 6−
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