Electromagnetic type acoustic transducers

Details Electromagnetic type acoustic transducers Electromagnetic type acoustic transducers

1979-02-23

1980-10-14

Cook, Daryl W.

1791155PV, H04R 718, H04R 902

Patent

active

042283272

ABSTRACT:
An electromagnetic type acoustic transducer comprises a vibratable diaphragm including a conductor and disposed within a magnetic field defined by a permanent magnet. Support members which are expandable and contractible in the direction at right angles with the diaphragm are fixed to both surfaces of the diaphragm. A frame is provided for fixing the support members such that the expansion and contraction thereof is not prevented. The support members may be folded and formed to a bellows-like state. Use is also made of a conductor forming spiral convolutions. The permanent magnet is disposed and retained at a vibration gap with respect to the diaphragm.

REFERENCES:
patent: 3012107 (1961-12-01), Hanlet
patent: 3829623 (1974-08-01), Willis et al.
patent: 3919498 (1975-11-01), Beer
patent: 3979566 (1976-09-01), Willy
patent: 4056697 (1977-11-01), Heil
patent: 4081627 (1978-03-01), Crist

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