Planar magnetic continuous-tone transducer

Details Planar magnetic continuous-tone transducer Planar magnetic continuous-tone transducer

1998-09-21

1999-11-23

Tran, Sinh

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Electromagnetic

381401, 381412, H04R 2500

Patent

active

059914238

ABSTRACT:
The planar magnetic continuous-tone transducer functions as a low power, wide dynamic range speaker. The planar magnetic continuous-tone transducer uses a conventional pair of ferrite cores on which are tightly wound primary and secondary coils. A very small air gap is provided between the two ferrite cores and the secondary coil is left unterminated. The application of a voltage at a selected frequency to the primary coil induces a harmonic force in the open secondary coil, which is transmitted to the two ferrite cores. The harmonic force causes the ferrite cores to vibrate, emitting a tone from the air gap region.

REFERENCES:
patent: Re15993 (1925-02-01), Peterson
patent: 1569411 (1926-01-01), Thomas
patent: 1606571 (1926-11-01), Heising
patent: 1660864 (1928-02-01), Conrad
patent: 1682505 (1928-08-01), Hanna
patent: 3584161 (1971-06-01), Hawley
patent: 5216723 (1993-06-01), Froeschle et al.
patent: 5861790 (1999-01-01), Johnson, Jr. et al.

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