Linear excursion-constant inductance loudspeaker

Details Linear excursion-constant inductance loudspeaker Linear excursion-constant inductance loudspeaker

1979-09-11

1981-10-13

Swann, III, Glen R.

Acoustics

Anatomic or prosthetic relation

Ear and mouth

179119R, 181167, H04R 906

Patent

active

042950112

ABSTRACT:
A loudspeaker has a focused magnetic field and a specialized voice-coil structure, which provides constant inductance at the voice coil over the entire extent of voice coil excursion. The magnetic field is focused to a thin disc and the winding of the voice coil is of a height so that it is always in view of the thin disc of the magnetic field. The voice coil winding is not more than two layers. An extended base cross-section center pole is employed having an undercut portion forming a crown at the top. The edges of the crown are chamfered to cooperate with chamfered edges on a top plate to form the thin disc of the focused magnetic field.

REFERENCES:
patent: 1953542 (1934-04-01), Pridham
patent: 2727949 (1955-12-01), Lokkesmoe
patent: 3160716 (1964-12-01), Luth
patent: 3881074 (1975-04-01), Kawamura
Molachlan, N. W. Loud Speakers, pp. 239-241. Dover Publications, Inc., N.Y., 1960.

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