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JPS5172429

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DESCRIPTION JPS5172429
(2, onnI'l) Patent Application (23) December 20, 1974! 11 ░ j j 1 Secretary [phase] Japan Patent
Office 0 JP-A 51-724290 published Japan Aid 51. (1976) G, 23 agency number serial number
7? 21 (f 7 J 2! Description 1, title of the invention
Electret electrostatic type annoyance fll converter
3. Detailed Description of the Invention The present invention relates to an electret electrostatic
electroacoustic transducer. First, a conventional example will be described with reference to FIG.
In FIG. 1, 1 and 1 'in FIG. 1 are electrets which are respectively affixed to the scissors fixed
electrodes 2 and 2'. Electret) 1. 1 'and fixed metal electrodes 2, 2' are drilled with% 9'01 1 '971
wave 3 radiation 16 * 6' '. A vibrating film 3 is provided in the middle of Electre, 1.1 'via a
uniform air gear rough 4.4'. The vibrating film 3 is very light in acoustic characteristics and is
preferably rigid, and polyester or the like is suitable. The vibrating membrane 3 has a conductive
layer on one side or both sides, and the vibrating membrane is attached to the ring 7. 9.9 'is an
electrode base made of an insulator. Further, as a moisture proof measure, a moisture proof film
6 attached to a moisture proof film ring 8 ░ 8 'is provided on the upper and lower sides of the
unit. In addition, a sound absorbing material 1o is filled in 9 'in order to improve the acoustic
characteristics. FIGS. 2a and 2b show the equivalent circuit of the electret, where a shows the
equivalent circuit of the non-perforated electret, bVi shows the equivalent circuit of the
conventional electret 1.1 'perforated and FIG. In a and b, C0 is the capacitance of the electret
film, R81 C, the surface resistance of the electret film, 'VO1 is the volume resistivity of the
electret film, vs is the surface potential of the electret, R82 is an open hole EndPage: 1 The
surface resistance of the film side surface,-the insulation resistance of air in one perforated
portion, co is the capacitance of air in the perforated portion. When a hole is formed in the
electret, a surface resistance R82 appears as shown in FIG. 2B /), and since this surface
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resistance R82 is smaller than the surface resistances R8 and VC, the charged charge is The
surface resistance is a J% resistance value 82 to 114, so that the life of the electret electrostatic
quantity W converter has a shortcoming and the K has a defect as well as the hole is formed.
Metal electrode 2 shown in FIG. 1 Signal voltage is added to .2 '. There is a drawback that the
performance of the electret static sound # converter is deteriorated because the metal electrode
2.2 'is easily discharged. The present invention eliminates the above-mentioned conventional
drawbacks, and one embodiment of the present invention will be described below with reference
to FIG. In FIG. 3, 1.1 is an electret and 2.2 'is a metal fixed electrode. In the electret 1'1 'and the
metal fixed electrodes 2, 2', sound wave-emitting holes 6.6 'necessary for acoustic characteristics
are perforated.
In the middle of the electret 1.1 ', the vibrating membrane 3 is laid out via a uniform air gear 4.4'.
The vibrating film 3 is very light in acoustic characteristics and is preferably a rigid book, and a
polyester ester or the like is suitable. The vibrating membrane 3 has a conductive layer on one
side or both sides, and the vibrating membrane is attached to the ring 7. 9, 9 'is an electrode base
made of an insulator. Further, as a moistureproofing measure, a moistureproofing film 6 attached
to the moistureproofing film rings 8, 8 'is provided on the upper and lower sides of the unit.
Further, a sound absorbing material 10 is filled in the electrode base 9 'in order to improve the
acoustic characteristics. 11.11 'is 9 FKP (copolymer of propylene hexafluoride and ethylene
tetrafluoride) coated with a thickness of a dozen micrometers on the outer periphery of the metal
fixed electrode 2.2'. This coating is made by first spraying a spray of FKP onto the metal fixed
electrode 2, 2 'and baking it at a temperature of about 350 "C, and then covering the metal fixed
electrode 2.degree. The coated nine FKP j 1, 11 'and the electret 1, 1' are attached. FIG. 4 is an
equivalent circuit diagram of an electret according to an embodiment of the present invention. In
FIG. 4, C represents electret, capacitance of film, R8, surface resistance of electret film, "VOl
represents volume resistivity of film, -vs represents surface potential of electret, R82 represents
perforated portion of electret film. Surface resistance of the side,-Air resistance of the perforated
portion ((Capacitance of air, Q, r: Capacitance of coated FEP, R81 ': Surface to surface resistance
of coated FEP, " VOI 'is the volume resistivity of the coated FEP. As apparent from FIG. 4, when
gold and III fixed electrodes 2.2 ? are coated with FKP, even if the surface resistance ? ? is
small, the specific resistance RVO1 ? of the coated FEP is large, so the charged charge leaks. It is
difficult to improve the life of the electret electrostatic electroacoustic transducer. 6A, 6B and 6C
show the life characteristics of the electret shown in FIGS. 2A, 2B and 4 respectively, and the
environmental conditions are the life characteristics in a thermostat bath at 80 ░ C. This is a
book that can improve the lifespan characteristics. Also, due to coating K, a signal voltage is
applied to the metal fixed electrode 2.2 'of the converter shown in FIG. 3 to make it difficult to
cause discharge from the main and metal surface fixed electrodes 2, 2'. The performance of the
electroacoustic transducer is improved.
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As described above, the present invention is a book in which not only the life of the electret
electrostatic converter is improved but also the discharge K-kage converter is obtained by
coating the metal fixed electrode. Although the above embodiment is an example of a push-pull
converter, the same effects as the above embodiment can be obtained with a push-pull converter
as well as a single converter. Further, although aFICP is coated in the above embodiment, it is not
limited to FKKK but may be a high insulator.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a conventional
electrostatic electroacoustic transducer, FIG. 2 a is an equivalent circuit diagram of an electret
film, and FIG. 2 is a hole used for the conventional electroacoustic transducer Fig. 3 is a crosssectional view of an electret electrostatic type electric f-converter in one embodiment of the
present invention EndPage: Fig. 4 is an equivalent circuit diagram of the same. The figure is a life
characteristic diagram of an electret having no hole, an electret B used in the conventional
example and an electret C used in the converter of the present invention. 1.1 ? ииииииии Electrets),
2.2 ? ииииии Metal fixed electrode, 3 иииии Vibrating film, 4, 4 ? иииииииии Air gap, ?, 6 ?
ииииииииииииииииииииииииииииииииииииииииииииииииииииииии FEP. Name of agent Attorney Nakao Toshio Nakao t1 11 people @ 1
Fig. 2 @ 3 Fig. 4 Fig. 4 Fig. 5 Seki Seki EndPage: 36 Inventors and agents other than the above
EndPage: ?
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