Acoustic diaphragm with polyurethane elastomer coating

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

H - Electricity

04

R

154/106, 117/195

H04R 7/00 (2006.01) G10K 13/00 (2006.01) H04R 7/12 (2006.01) H04R 31/00 (2006.01)

Patent

CA 1098774

Abstract of the Disclosure 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 evapo- ration 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.

278499

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