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Optical touch panel with heat sink

  • US 4,880,969 A
  • Filed: 08/26/1988
  • Issued: 11/14/1989
  • Est. Priority Date: 04/30/1986
  • Status: Expired due to Fees
First Claim
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1. A programmable touch panel, comprising:

  • a plurality of keyswitches for entry of data, each keyswitch comprising;

    a light source for providing a light beam along a first optical path;

    first means for reflecting the light beam so that the light beam traverses a second optical path;

    second means for reflecting the light beam so that the light beam traverses a third optical path generally parallel to the first optical path and opposite in direction thereto; and

    detector means for producing a detector signal in response to light traversing the third optical path;

    a display module for displaying information input via the keyswitches;

    a printed circuit board upon which the plurality of keyswitches and the display module are mounted; and

    a heat sink adjacent the printed circuit board, the heat sink including a plurality of openings therethrough such that the first and third optical paths for each keyswitch pass through corresponding openings in the heat sink.

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