Broad band dynamic loudspeaker

Details Broad band dynamic loudspeaker Broad band dynamic loudspeaker

1978-12-18

1980-09-30

Robinson, Thomas A.

H04R 714

Patent

active

042257565

ABSTRACT:
A dynamic loudspeaker which operates over a wide band of audio frequencies is disclosed. The speaker includes a speaker cone and voice coil structure of very low mass. A configuration of ribs on the cone and dust cap is important to both high and low frequency performance. The rear suspension for the speaker is a bearing on the voice coil structure. The bearing encircles and slides on the magnetic center pole of the speaker. A method of fabricating the low mass coil structure is disclosed, including forming the bearing surface by heat shrinkage of a low friction tape.

REFERENCES:
patent: 2207240 (1940-07-01), Cornwell
patent: 2769942 (1956-11-01), Hassan
patent: 2862069 (1958-11-01), Marchano et al.
patent: 3358088 (1967-12-01), Gault
patent: 3513270 (1970-05-01), Warning
"Standard Handbook for Electrical Engineers", Knowlton, Editor 1957 McGraw-Hill Book Company, Inc., pp. 4-80 & Table 4-11.

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