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EL sheet diaphragm and a switch using the same

  • US 5,871,088 A
  • Filed: 01/16/1998
  • Issued: 02/16/1999
  • Est. Priority Date: 03/30/1995
  • Status: Expired due to Term
First Claim
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1. An EL sheet diaphragm comprising a diffusion type EL sheet having a diaphragm portion exhibiting a dome shape and a flange supporting portion disposed about the outer circumference of said diffusion type EL sheet, said diffusion type EL sheet comprising:

  • a transparent film having an upper surface and a lower surface,a transparent electrode layer formed on said lower surface of said transparent film,a light emitting layer formed on said transparent electrode layer,a dielectric layer formed on said light emitting layer,a rear electrode layer formed on said dielectric layer, andan insulating layer formed on said rear electrode layer,said diffusion type EL sheet emitting light from at least one selected from the group consisting of (i) the entire area of said EL sheet, (ii) the diaphragm portion only, and (iii) the entire area of said diaphragm portion and an area surrounding said diaphragm portion of said upper surface of said transparent film, said diffusion type EL sheet bowing outwardly in an at-rest state such that said upper surface of said transparent film exhibits a convex shape, said diffusion type EL sheet bowing inwardly when depressed for operation such that said upper surface of said transparent film exhibits a concave shape.

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