Patent ID: 7677355

Claim:
A manufacturing method of a speaker diaphragm where a speaker diaphragm is manufactured from a piece of wooden sheet, comprising: a Japanese-sake impregnating step of impregnating the wooden sheet with Japanese sake; a first pressing step of tentatively molding the wooden sheet in a predetermined shape; a first drying step of drying the wooden sheet tentatively molded in the predetermined shape; a thermosetting resin impregnating step of impregnating thermosetting resin into the wooden sheet dried in the first drying step; a half-drying step of half-drying the wooden sheet impregnated with the thermosetting resin; a second pressing step of molding the wooden sheet half-dried in the half-drying step in a predetermined shape by heating and pressing; and a moisture-proof agent applying step of applying a moisture-proof agent to the wooden sheet molded in the predetermined shape.