Loudspeaker diaphragm and method for manufacturing the same
First Claim
1. A loudspeaker diaphragm comprising a base layer having a woven fabric of a plurality of polyethylene naphthalate fibers and impregnated with a thermosetting resin, wherein each of the plurality of polyethylene naphthalate fibers is an untwisted fiber, and wherein the loudspeaker diaphragm exhibits an internal loss of 0.40 or more.
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Accused Products
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.
26 Citations
19 Claims
- 1. A loudspeaker diaphragm comprising a base layer having a woven fabric of a plurality of polyethylene naphthalate fibers and impregnated with a thermosetting resin, wherein each of the plurality of polyethylene naphthalate fibers is an untwisted fiber, and wherein the loudspeaker diaphragm exhibits an internal loss of 0.40 or more.
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14. A loudspeaker comprising a loudspeaker diaphragm having a base layer that has a woven fabric of a plurality of polyethylene naphthalate fibers and impregnated with a thermosetting resin, wherein each of the plurality of polyethylene naphthalate fibers is an untwisted fiber, and wherein the loudspeaker diaphragm exhibits an internal loss of 0.40 or more.
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15. A method for manufacturing a loudspeaker diaphragm comprising:
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impregnating a woven fabric of a plurality of polyethylene naphthalate fibers with a thermosetting resin and curing the thermosetting resin, so as to form a base layer; adding inactive gas in a supercritical state to a molten thermoplastic resin and extruding the mixture of the thermoplastic resin and the inactive gas at prescribed temperature and pressure, so as to form a thermoplastic resin layer; and laminating the base layer and the thermoplastic resin layer; wherein each of the plurality of polyethylene naphthalate fibers is an untwisted fiber, and wherein the loudspeaker diaphragm exhibits an internal loss of 0.40 or more. - View Dependent Claims (16)
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- 17. A loudspeaker diaphragm comprising a base layer as the outermost layer, a thermoplastic resin layer and a thermoplastic elastomer layer, wherein the base layer has a woven fabric of a plurality of polyethylene naphthalate fibers and impregnated with a thermosetting resin, wherein each of the plurality of polyethylene naphthalate fibers is an untwisted fiber, and wherein the loudspeaker diaphragm exhibits an internal loss of 0.40 or more.
Specification