Electro-magnetic type electric acoustic transducer

Details Electro-magnetic type electric acoustic transducer Electro-magnetic type electric acoustic transducer

1978-12-27

1982-11-09

Moffitt, James W.

H04R 1918

Patent

active

043586422

ABSTRACT:
An electro-magnetic type electric acoustic transducer comprising an exciting portion consisting of a back plate mounting a permanent magnet and a magnetic core winding an exciting coil therearound, a vibrating plate arranged opposite to said exciting portion leaving a certain space, and a vibrating plate supporting member which supports the periphery of said vibrating plate, characterized in that the resonance frequency of the vibrating plate is reduced while maintaining sound pressure by providing an air hole at a part of said plate or said vibrating plate supporting member.

REFERENCES:
patent: 1486081 (1924-03-01), Fischer
patent: 1536486 (1925-05-01), Fischer
patent: 1698407 (1929-01-01), Johnson
patent: 2390794 (1975-12-01), Knight
patent: 3324253 (1967-06-01), Uemura et al.

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