Magnetic circuit for planar diaphragm type loudspeaker

Details Magnetic circuit for planar diaphragm type loudspeaker Magnetic circuit for planar diaphragm type loudspeaker

1980-06-30

1982-06-08

Stellar, George G.

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Retarded or delayed type

179117, 335306, H04R 902

Patent

active

043341276

ABSTRACT:
A magnetic circuit for a planar diaphragm type loudspeaker having a square planar diaphragm and square voice coil in which four magnetic circuits are arranged in a square corresponding to the edges of the planar diaphragm. Pairs of plates are disposed opposite to one another upon which are attached a number of magnets with the opposed poles opposite one another along the inner walls of the oppositely disposed plates. Each of the magnets is rectangular in shape. A yoke connects the pairs of plates. Holes for permitting air flow are formed either in the yoke or in the pairs of oppositely disposed plates in patterns such as to not disturb the magnetic field. The magnetic circuit units made up by the magnets, pairs of plates, and yokes are joined at their ends by magnetic couplings. An electrical conductive member may be disposed over portions of the magnets to prevent the occurrence of third harmonic distortion due to current distribution.

REFERENCES:
patent: 1743011 (1930-01-01), Zimmerman
patent: 3937905 (1976-02-01), Manger
patent: 3979566 (1976-09-01), Willy
patent: 4013846 (1977-03-01), Krawczak et al.

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