Acoustics – Anatomic or prosthetic relation – Ear and mouth
Patent
1975-01-02
1976-12-14
Stellar, George G.
Acoustics
Anatomic or prosthetic relation
Ear and mouth
179180, 181166, H04R 902
Patent
active
039977390
ABSTRACT:
An electrodynamic type electroacoustic transducer wherein a diaphragm of a nonmagnetic and insulative material having thereon a series of conductors is disposed between a pair of magnetic circuits opposing one another through a slight clearance so that the conductors will lie in magnetic flux flowing between opposite polarity ends of at least a pair of permanent magnets in each magnetic circuit and will move in directions transverse the flux when the diaphragm is vibrated, in which the diaphragm is resiliently held in said clearance by means of an elastic support means inserted at least between the diaphragm and the respective opposing pole ends of the magnets in both circuits so as to be prevented from contacting the pole ends when vibrated. Preferably said means on sound-passing side of the magnetic circuit is a disk-shaped pad of glass fiber or the like and the one on non-sound-passing side circuit is glass fiber or the like filled in spaces defined by the diaphragm and the magnets and soft iron plate coupling them in the circuit so as to absorb sounds.
REFERENCES:
patent: 1604788 (1926-10-01), Rocind
patent: 1815564 (1931-07-01), High
patent: 1868640 (1932-07-01), Dodszus
patent: 2934612 (1960-04-01), Stanton
patent: 3674946 (1972-07-01), Winey
Adachi Atsushi
Kishikawa Kenichiro
Foster Electric Co. Ltd.
Stellar George G.
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