Diaphragm for speaker

Details Diaphragm for speaker Diaphragm for speaker

1977-10-25

1978-12-12

Van Balen, William J.

Acoustics

Diaphragm

Critically defined material or coating

181170, 428 64, 428309, 428311, 428312, 428328, H04R 712, G10K 1300, B32B 310

Patent

active

041291956

ABSTRACT:
A diaphragm for a dynamic cone speaker which is composed of a porous metal produced from a metal such as nickel, wherein a layer, such as of aluminum foil, is disposed on a surface of the porous metal to eliminate the gas permeability of the porous metal.

REFERENCES:
patent: 2600220 (1952-06-01), Doelker, Jr. et al.
patent: 3111187 (1963-11-01), Barlow
patent: 3264720 (1966-08-01), Mott
patent: 3508626 (1970-04-01), Robbins
patent: 3562089 (1971-02-01), Warnaka et al.
patent: 3574108 (1971-04-01), Lewis et al.
patent: 3761231 (1973-09-01), Dowell et al.
patent: 3834486 (1974-09-01), Tsuge et al.
patent: 4026384 (1977-05-01), Yamachika et al.
Japanese Utility Model publication 61025/1975 laid open to public in Japan on Jun. 5, 1975, 1 shtdwg, 4 p spec.

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