Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1982-07-28
1985-01-08
Rubinson, Gene Z.
Electrical generator or motor structure
Dynamoelectric
Rotary
29 2535, 310324, H04R 1901, H04R 1900, H04R 1700
Patent
active
044928254
ABSTRACT:
A transducer embodying the present invention is assembled on a discrete electrically conductive frame (100) that has been formed to provide both leads (120-140) and a backplate (110). An integrated circuit chip (200) is bonded to one of the leads, and a dielectric inner housing member (300) is molded about the backplate and the portion of the leads adjacent to it. The inner housing member encapsulates the chip, embraces the perimeter of the backplate, and provides a cylindrical opening (310) that extends on each side of the backplate. A conductive outer housing member (400) is subsequently molded about the perimeter of the inner housing member, and a spacer (500), electret diaphragm assembly (600), and conductive gasket (700) are sequentially positioned in the opening on one side of the backplate. Conductive front and back covers (800,900) are thereafter bonded to the outer housing to close the opening and to complete a conductive enclosure that provides electrostatic shielding for the transducer. In addition, electrical continuity is provided between a metalized surface on the electret diaphragm and the conductive enclosure by means of the gasket.
REFERENCES:
patent: 3775572 (1973-11-01), Ishibashi et al.
patent: 3816671 (1974-06-01), Fraim et al.
patent: 3946422 (1976-03-01), Yagi et al.
patent: 3963881 (1976-06-01), Fraim et al.
patent: 4046974 (1977-09-01), Braumhauer et al.
patent: 4170721 (1979-10-01), Ishibashi et al.
patent: 4188513 (1980-02-01), Morrell et al.
patent: 4331840 (1982-05-01), Murphy et al.
Brzezinski Alex M.
Hershey Harold J.
Whitesell Stephen R.
AT&T Bell Laboratories
Byrd Danita R.
Newman H. L.
Rubinson Gene Z.
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