Electroacoustic converter having a recessed step on the center p

Details Electroacoustic converter having a recessed step on the center p Electroacoustic converter having a recessed step on the center p

1986-06-09

1988-06-21

Ng, Jin F.

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Having electrostatic element

381194, 381199, 381201, H04R 718, H04R 720

Patent

active

047529636

ABSTRACT:
In an electroacoustic converter, center pole and top plate which constitute a magnetic circuit are mechanically abutted against each other by interposing an air gap defining member therebetween. The air gap defining member is a projection provided on the center pole or top plate, otherwise non-magnetic ring-like sleeve covered on the center pole or top plate. An air gap in the magnetic circuit can be precisely defined by the air gap defining member without using any alignment tool in its assemble process.

REFERENCES:
patent: Re26030 (1966-05-01), Marchand et al.
patent: 2392143 (1946-01-01), Graham
patent: 2395166 (1946-02-01), Collins
patent: 2551949 (1951-05-01), Hunter
patent: 2604551 (1952-07-01), Charlesworth
patent: 2942071 (1960-06-01), Witchey
patent: 3766334 (1973-10-01), Burke
patent: 3790724 (1974-02-01), Schenkel
patent: 3867586 (1975-02-01), Maekawa et al.
patent: 3991286 (1976-11-01), Henricksen
patent: 4317965 (1982-03-01), Toyoda

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