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Key input device

  • US 4,646,062 A
  • Filed: 07/26/1984
  • Issued: 02/24/1987
  • Est. Priority Date: 08/02/1983
  • Status: Expired due to Term
First Claim
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1. A key input device comprising:

  • a first plate member having an inner and an outer wall, said first plate member made of a transparent member having an electrical insulation property;

    first electrode means made of a conductor and formed on said inner wall of said first plate member;

    a second plate member having an inner and an outer wall and being oriented substantially parallel to said first plate member so as to sandwich said first electrode means, said second plate member being made of a transparent member having an electrical insulation property, said outer wall defining a light incident side;

    second electrode means made of a conductor and formed on said inner wall of said second plate member, each said inner wall of said plate members facing each other; and

    a focusing means provided by a projecting member made of a transparent member, said projecting member being formed on one of said inner walls, said inner wall being on the plate member not including the light incident side.

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