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US 7,443,998 B2Granted
Speaker diaphragm and manufacturing method thereof
AssigneesPioneer Corporation, Tohoku Pioneer Corporation
InventorSatoshi Hachiya
Life of this patent
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Abstract
A speaker diaphragm which has a high rigidity and can improve sound transmission speed for better sound quality is provided. The speaker diaphragm contains fibers of 3 to 50 mm length mixed in matrix resin. The fibers are oriented radially from center to periphery in surface layers of the diaphragm, while they are oriented in different directions in a middle layer. After setting the resin, these fibers are fixed in the matrix resin with certain tension applied thereto.
Claims3
A speaker diaphragm comprising:
- first and second surface layers;
- and
- a middle layer sandwiched between the first and second surface layers,
- wherein the surface layers and the middle layer are made of a resin and fibers in the resin forming a fiber reinforced resin, the fibers having a length in a range of 3 to 50 mm,
- wherein the fibers in both the first and second surface layers are oriented in a direction radially oriented from a center to a periphery of the diaphragm and the fibers in the middle layer of the diaphragm are oriented in a multidimensional direction from the fibers in both of the first and second layers, and
- wherein a thickness of the middle layer is larger than a sum of thicknesses of both the first and second surface layers.
3 more elements
Dependencies are inferred from the claim text.