Electrodynamic loudspeaker

Details Electrodynamic loudspeaker Electrodynamic loudspeaker

1981-07-07

1984-01-17

Rubinson, Gene Z.

Acoustics

Anatomic or prosthetic relation

Ear and mouth

1791155R, 179116, 179181R, 181157, 181166, H04R 900, H04R 906

Patent

active

044265565

ABSTRACT:
An electrodynamic loudspeaker which comprises a generally rectangular flat vibrating plate, and first and second magnetic drives for driving the vibrating plate to produce vibrations. The first magnetic drive is so positioned as to drive the vibrating plate at a first location corresponding to one of two line nodes m.sub.1 and m.sub.2 of vibration of a first predetermined frequency f.sub.1 which would be produced when the vibrating plate is driven at the center thereof, whereas the second magnetic drive is so positioned as to drive the vibrating plate at a second location corresponding to one of four line nodes n.sub.1, n.sub.2, n.sub.3 and n.sub.4 of vibration of a second predetermined frequency f.sub.3 which would be produced when the vibrating plate is driven at the center thereof. Each of all of the line nodes extends in parallel to the shorter sides of the rectangular shape of the vibrating plate.

REFERENCES:
patent: 2007746 (1935-07-01), Ringel
patent: 2956538 (1960-10-01), Rich
patent: 4225757 (1980-09-01), Babb
patent: 4252211 (1981-02-01), Matsuda et al.

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