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Light pen having actuating accelerometer

  • US 4,695,831 A
  • Filed: 05/06/1985
  • Issued: 09/22/1987
  • Est. Priority Date: 05/06/1985
  • Status: Expired due to Fees
First Claim
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1. In the combination of a cathode ray tube display having a transparent screen, a raster for writing to said display and a light pen having a photosensor for detecting raster passage from the front of said cathode ray display and relaying raster passage to software logic interior of a computer;

  • and a switch in combination with said light pen for gating a signal from said photosensor to circuitry for locating position of said photosensor in relation to said display, the improvement to said switch including an accelerometer mounted to said light pen actuated by the tapping of said light pen on the transparent screen of said CRT, said accelerometer including a mass movably mounted to said light pen and a transducer for detecting movement of said mass upon acceleration of said light pen upon tapping said light pen, and actuating said switch in response thereto.

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