Acoustic diaphragm with polyurethane elastomer coating

Details Acoustic diaphragm with polyurethane elastomer coating Acoustic diaphragm with polyurethane elastomer coating

1977-05-16

1979-02-20

Ball, Michael W.

Acoustics

Diaphragm

Critically defined material or coating

181166, 181170, 428425, G10K 1300, H04R 700

Patent

active

041402030

ABSTRACT:
An acoustic diaphragm has a substrate of either a hard resin film or cloth of an organic material, and at least one side of the substrate is laid with a polyurethane elastomer layer. In the case of a cloth substrate, the cloth is optionally metallized by evaporation deposition of Al or Ti and/or impregnated with a thermosetting resin. The elastomer is a copolymer given by condensation of bifunctional polymeric alcohol and a glycol with a diisocyanate. This diaphragm features a flat response curve at medium to high frequencies on account of its relatively large value for Young's modulus and adequately great internal loss, and accordingly is particularly useful for tweeters.

REFERENCES:
patent: 1715598 (1929-06-01), Hawley et al.
patent: 3093207 (1963-06-01), Bozak
patent: 3196975 (1965-07-01), Voelker
patent: 3285364 (1966-11-01), Cohen
patent: 3328537 (1967-06-01), Heaht
patent: 3467572 (1969-09-01), Ahramjian
patent: 3612783 (1971-10-01), Schneider
patent: 3858680 (1975-01-01), Tsuge et al.
patent: 3937905 (1976-02-01), Manger

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