Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Having electrostatic element
Patent
1992-04-16
1993-12-21
Ng, Jin F.
Electrical audio signal processing systems and devices
Electro-acoustic audio transducer
Having electrostatic element
381168, 381174, H04R 2500
Patent
active
052727580
ABSTRACT:
An electret film is formed on the rear side of a front face plate of a cylindrical capsule made of aluminum . Closely in spaced opposition thereto, an electrically conductive diaphragm is held by an electrically conductive holding member. A wiring board provided behind the holding member closes the rear end of the capsule. The rear end of the capsule is bent on the rear periphery of the wiring board, and calked thereat. In the capsule, an impedance conversion IC device is connected to the electrically conductive holding member and the wiring board.
REFERENCES:
patent: 3942029 (1976-03-01), Kawakami et al.
patent: 4626729 (1986-12-01), Lewiner et al.
patent: 5097515 (1992-03-01), Baba
Isogami Shuzo
Izuchi Toshirou
Nishikawa Kouji
Ohta Kiyoshi
Ono Kazuo
Hosiden Corporation
Le Huyen D.
Ng Jin F.
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