Speaker or microphone having corrugated diaphragm with conductor

Details Speaker or microphone having corrugated diaphragm with conductor Speaker or microphone having corrugated diaphragm with conductor

1979-05-30

1981-06-30

Brown, Thomas W.

1791155ES, H04R 714, H04R 718, H04R 904

Patent

active

042764491

ABSTRACT:
A thin film member formed of a synthetic resin material, a paper material or a non-magnetic metal foil material is provided on its both surfaces with conductors. The thin film member is then corrugated, as by folding, to form a number of elongate, arcuate corrugations which serve as a diaphragm. Rod-like permanent magnets extending perpendicularly to the conductors on each trough in the corrugations and generating magnetic flux in the same direction are retained over substantially the entire length between adjacent trough portions. The diaphragm is supported on both surfaces of each side edge thereof by support members which are expandable and contractable only in the direction extending perpendicularly to the diaphragm.

REFERENCES:
patent: 2439666 (1948-04-01), Marquis
patent: 3164686 (1965-01-01), Tibbetts

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