×

Dustproof structure for optical coordinate input apparatus

  • US 4,769,535 A
  • Filed: 12/05/1986
  • Issued: 09/06/1988
  • Est. Priority Date: 01/07/1986
  • Status: Expired due to Fees
First Claim
Patent Images

1. An optical coordinate input apparatus having a frame mounted to a display screen or operation panel, two sets of optical elements arranged mutually orthogonal to each other on respective sides of said frame so as to define an optical input area in front of said display screen, each set including a row of light emitting elements for emitting respective light beams across said input area to be received by a row of corresponding light receiving elements, respectively, and means for detecting a coordinate input position where a light beam is blocked by an object interposed in the input area,wherein the improvement comprises a structure for preventing dust contamination of the optional elements formed by a longitudinal row of optical elements mounted to a longitudinal base plate on one side thereof, and a longitudinal filter member which is formed as an integral body of a longitudinal front wall for transmission of the light beams therethrough joined to longitudinal top and bottom walls and is mounted to said base plate by said top and bottom walls being fixed against said base plate to form an airtight chamber therein.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×