Acoustics – Diaphragm – Critically defined material or coating
Reexamination Certificate
2004-02-17
2008-12-23
Benson, Walter (Department: 2837)
Acoustics
Diaphragm
Critically defined material or coating
C181S168000, C181S169000, C181S170000, C181S157000, C381S426000, C381S427000, C381S428000, C381S423000
Reexamination Certificate
active
07467686
ABSTRACT:
On one surface of a piece of wooden sheet, a cloth or paper is adhered to make an adhered sheet. An approximately V-shaped notch is provided on the adhered sheet, the adhered sheet is wetted to be softened, and a lubricant which acts to keep water is impregnated thereinto. Edge portions of the notch are overlapped, and the adhered sheet is tentatively molded in an approximately horn shape by a first hot press molding. The adhered sheet is then dried, impregnated with thermosetting resin, and half-dried. The adhered sheet is subject to a second hot press molding. A moisture-proof agent is applied on the adhered sheet, a center hole for a voice coil and periphery are removed to make a speaker diaphragm having a predetermined dimension and shape.
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Hirano Takeshi
Imamura Satoshi
Kuwahata Toshikatsu
Ogata Tomoaki
Benson Walter
Luks Jeremy
Meyer Jerald L.
Nath Law Group
Victor Company of Japan , Limited
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