Loudspeaker diaphragm and method for manufacturing the same

Details Loudspeaker diaphragm and method for manufacturing the same Loudspeaker diaphragm and method for manufacturing the same

2003-12-08

2009-12-15

Donels, Jeffrey (Department: 2832)

Acoustics

Diaphragm

Critically defined material or coating

C181S167000, C181S170000, C381S426000, C381S428000, C029S594000, C029S609100

Reexamination Certificate

active

07631723

ABSTRACT:
A loudspeaker diaphragm having light weight and an excellent balance between a rigidity and an internal loss, and a simple and inexpensive method for manufacturing such a diaphragm are provided. The loudspeaker diaphragm includes a base layer having a woven fabric of a polyethylene naphthalate fiber impregnated with a thermosetting resin, and optionally a thermoplastic resin layer and/or a thermoplastic elastomer layer. The polyethylene naphthalate fiber is preferably an untwisted fiber. A fiber/resin weight ratio in the base layer is preferably in the range of 60/40 to 80/20. Preferably, the thermoplastic resin layer has a finely foamed structure and an average diameter of a cell in the finely foamed structure is 10 to 60 μm.

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