Speaker diaphragms, manufacturing methods of the same, and...

Acoustics – Diaphragm – Critically defined material or coating

Reexamination Certificate

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Details

Other Related Categories

C181S168000, C181S169000, C181S170000, C181S157000, C381S426000, C381S427000, C381S428000, C381S423000

Type

Reexamination Certificate

Status

active

Patent number

07467686

Description

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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