Patent ID: 8442261

Claim:
A diaphragm based on a film base of polyethylene terephthalate resin film, the diaphragm comprising: a first vibrating part of a dome shape, the first vibrating part including: a central portion of the film base, being of a dome shape and made of polyethylene terephthalate resin, a thermosensitive adhesive resin film, provided only on the central portion, and a fiber sheet, being of a dome shape and made of a woven fabric using carbon fiber or an embossed nonwoven fabric, the fiber sheet being provided only on thermosensitive adhesive resin film; and a second vibrating part of an annular shape, being made of polyethylene terephthalate resin and including a peripheral portion of the film base provided around the central portion of the film base, wherein a boundary between the central portion and the peripheral portion of the film base forms a valley.