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JPS5119774

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DESCRIPTION JPS5119774
■ Electrostatic-type acoustoelectric converter ■ Japanese Patent Application No. 46-31736
[phase] Application No. 46 (1971) published May 12 47-45815 @ Akira 47 (1972) December 26
@ inventor Nagahama Koji Gunma Prefecture Raku-gun Oizumi-cho Oji Sakata 180 @ Higashi
Sanyo Electric Co., Ltd. @ applicant Sanyo Electric Co., Ltd. Moriguchi-shi Keihan Hondori 2 18
Tokyo Sanyo Electric Co., Ltd. Gunma Pref. The present invention relates to an electrostatic
acoustoelectric transducer comprising a vibrating electrode and a back electrode. In recent years,
in such an electrostatic type acoustoelectric converter, in order to have an improvement in
frequency characteristics and sensitivity and further to have a self-orientation polarity called
electret, its vibrating electrode is made of such as A film of a polymeric substance that can be
made chemically stable and extremely thin [111111] such as polyethylene terephthalate has
been used instead of one consisting of a single metal, but the polymeric substance has high
insulation properties. However, it is necessary to form an electrode film separately by a method
such as vacuum deposition of metal on one side of the electrode body. Conventionally, aluminum
zinc or the like having characteristics of low evaporation temperature and high evaporation rate
has been widely used as the deposition metal of this reservoir, but the inventor has made it
possible to use an electrostatic acoustoelectricity employing such a metal as the deposition metal.
When the transducer is used in an atmosphere containing a high humidity or a gas such as acid,
the acousto-electrical conversion characteristics are significantly degraded due to oxidation or
erosion of the deposited metal, and the function is completely lost. I admit that. In order to solve
this problem, it is conceivable to use chromium, titanium, platinum, gold, etc., which are
chemically stable, ie, have high evaporation temperature and low evaporation rate, as the vapordeposited metal. There is a disadvantage that is extremely disadvantageous in terms of ease of
production and cost. The present invention further stabilizes the acousto-electrical conversion
characteristics by thinly coating a chemically and physically stable polymer substance on the
surface of the electrode film made of vapor deposited metal, and additionally forming such a
separate polymer film. It is an object of the present invention to provide an electrostatic acoustoelectric converter which is considered not to be disturbed by assembly work, and will be
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described with reference to an embodiment which can be illustrated in detail below. In FIG. 1, the
vibrating electrode 1 forms an electrode film 3 by vapor deposition of aluminum or zinc on a
vibrating film 2 made of polyethylene terephthalate film, and is chemically stable on the surface
of the electrode film 3. A very thin protective film 4 having a thickness of about 50 to 500 A is
formed by spraying and coating a polymer substance, for example, vinyl, and this vibration is
disposed opposite to each other, and the electrode ring 7 is placed thereon. By holding the space
ring 6 and the electrode ring 7 [111111] EndPage: 1, the vibrating electrode 1 is stretched and
fixed above the electrode 5 in the past with a fixed interval.
According to such an electrostatic type acoustoelectric converter of the present invention, since
the electrode film 3 is insulated from the atmosphere by the protective film 4, the oxidation or
erosion thereof can be completely prevented, and stabilization of the acoustoelectric conversion
characteristics is achieved. The above-mentioned effect shown in FIG. 1 can be extremely
enhanced, but in the case of forming the protective film 4 in order to electrically connect the
electrode film 3 and the electrode ring 7 to each other as shown in FIG. It is necessary to remove
the coating on the part where the electrode ring 7 abuts after coating the entire surface on the
electrode film 3 or to prevent coating on the part in contact with the upper electrode ring 70.
FIGS. 2 and 3 show an embodiment of the present invention in which such troublesome
manufacturing is eliminated, wherein a protective film 4 by coating of a polymer substance is
formed on the entire surface of the electrode film 3, A first member for holding one side of the
vibrating electrode 1, that is, the electrode ring 7 is formed with a projection 7a and a second
member for holding the other side of the vibrating electrode 1, that is, a holding frame for the
back electrode 5. A fourth portion 8a in which the convex portion 7a is fitted is formed at 8.
According to the present invention, the case 10 is sequentially inserted with the net 10 ring 11,
the electrode ring 7, the vibrating electrode 1, the holding frame 8 for holding the back electrode
5, the comb ring 12 and the terminal ring 13 for grounding. When the lower end portion of 9 is
crimped, the convex portion 7a of the electrode ring 7 is fitted to the concave portion 8a of the
holding frame 8 by the tightening force as shown in FIG. In this fitting portion, the convex
portion 7a contacts the electrode film 3, and the electrode film 3 and the electrode ring 7 are
electrically connected. This electrode ring 7 is used for grounding via the case 9 Electrically
connected to the terminal ring 13. In FIG. 2 and FIG. 3, the back electrode 5 is slightly bent
outward, and the vibrating electrode 1W111111 is stretched on the back electrode 5 in a state of
being in contact therewith. Although the points are different from those shown in FIG. 1, it is
needless to say that the above-mentioned means for stretching the vibration electrode 1
including the concavo-convex fitting portion can be applied to the one shown in FIG. The present
invention can be variously modified, and in the embodiment, the first member for holding the
vibrating electrode, that is, the convex portion is provided on the electrode ring and the second
member is shown by the holding frame for holding the back electrode. Although the
configuration in which the second member is provided with the concave portion is shown, the
convex portion and the four portions may be formed on either side of the first member and the
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second member, and the second member uses the back electrode as a case. Alternatively, the
back electrode can also be used if it is electrically isolated. As described above, the present
invention relates to a vibrating electrode, in which an electrode film is formed by metal
deposition on a vibrating film made of a polymer substance, and a polymer is further formed to
prevent oxidation and erosion on the surface of the electrode film. In a thin film coated with a
substance to form a protective film, the protective film is broken by the concavo-convex fitting
portions provided on the first and second members holding the vibrating electrode by simply
tightening the first and second members against each other. Since any one of the second member
and the second member is electrically connected to the electrode film, the coating of the polymer
material for forming the protective film is not restricted at all on the electrode film, and the
entire surface of the electrode film is coated Even if it has been done, there is no loss in its
assembling workability.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing the present
invention, FIG. 2 is a cross-sectional view showing an embodiment of the present invention, and
FIG. 3 is an enlarged view of essential parts in FIG. . [Phase] Japanese Patent Publication No. 45'5818, Japanese Examined Patent Publication No. 36-5712 [111111] EndPage: 2
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