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Light distribution for illuminated keyboard switches and displays

  • US 5,397,867 A
  • Filed: 03/23/1993
  • Issued: 03/14/1995
  • Est. Priority Date: 09/04/1992
  • Status: Expired due to Term
First Claim
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1. A multi-layer backlit membrane switch, said switch comprising:

  • an at least partially light transmissive external membrane switch cover;

    at least one electrical switch;

    at least one light source means for illuminating at least a portion of said cover, said at least one light source means having a light intensity distribution along said at least a portion of said cover; and

    at least one means for modifying said light intensity distribution along said at least a portion of said cover, said modifying means located at least partially between said light source and said switch cover and comprising a variable transmittance layer, said variable transmittance layer comprising a photoemulsion negative of light distribution from said light source means at said modifying means.

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