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Diaphragm including a first vibrating part of a dome shape or flat shape and a second vibrating part of an annular shape and a loudspeaker using the diaphragm

  • US 8,442,261 B2
  • Filed: 05/12/2009
  • Issued: 05/14/2013
  • Est. Priority Date: 06/04/2008
  • Status: Expired due to Fees
First Claim
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1. 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, anda 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.

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