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US 8,300,875 B2Granted
Speaker diaphragm and speaker including the same
AssigneeSony Corporation
InventorsToru Takebe, Kunihiko Tokura, Masaru Uryu, Takahisa Tagami, Emiko Ikeda
Life of this patent
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Abstract
A speaker diaphragm includes a thermoplastic resin having a three-layer structure. The three-layer structure includes a polyester film as a base material of the three-layer structure, a polyimide-based resin layer as a top layer of the three-layer structure, and another polyimide-based resin layer as a bottom layer of the three-layer structure.
Claims18
A speaker diaphragm comprising:
- a thermoplastic resin having a three-layer structure including:
- a polyester film as a base material of the three-layer structure;
- a polyimide-based resin layer approximately 6 microns thick as a top layer of the three-layer structure;
- and
- another polyimide-based resin layer approximately 6 microns thick as a bottom layer of the three-layer structure, wherein thicknesses of the top and bottom layers are each less than a thickness of the base material and wherein the thicknesses of the layers are selected such that the speaker diaphragm retains its shape when subjected to a temperature of 140 Celsius for a period of time of about one hundred hours.
2 more elements
A speaker comprising:
- a speaker diaphragm having a three-layer structure comprising:
- a polyester film as a base material of the three-layer structure;
- a polyimide-based resin layer as a top layer of the three-layer structure;
- another polyimide-based resin layer as a bottom layer of the three-layer structure;
- and
- a centrally domed portion surrounded by a domed edge portion,
- wherein thicknesses of the top and bottom layers are each less than a thickness of the base material, and wherein the thicknesses of the layers are selected such that the speaker diaphragm retains its shape when subjected to a temperature of 140 Celsius for a period of time of about one hundred hours;
- a magnetic circuit comprising:
- an annular plate located adjacent the domed edge portion;
- and
- a central pole extending through the annular plate;
- and
- a voice coil attached to the speaker diaphragm and located in a gap between the annular plate and central pole.
10 more elements
Dependencies are inferred from the claim text.