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Coordinate detecting apparatus for use with optical projecting apparatus

  • US 3,917,955 A
  • Filed: 09/06/1974
  • Issued: 11/04/1975
  • Est. Priority Date: 09/06/1973
  • Status: Expired due to Term
First Claim
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1. A coordinate detecting apparatus for use with an optical projecting apparatus which includes an illuminating light source for projecting an optically recorded medium, an illuminating optical system, a recorded-medium support member, a projecting optical system and a screen, said coordinate detecting apparatus comprising:

  • light spot generating means including a cathode-ray tube for generating a light spot to scan the screen on which an optical picture image is projected in a composed manner, a deflecting circuit and a composite projecting optical system;

    photoelectric detecting means for detecting the light spot on the screen; and

    coordinate position detecting means responsive both to the photoelectrically detected output signal of said photoelectric detecting means and to the deflecting signal of said cathoderay tube for detecting the coordinate position of said photoelectric detecting means on the screen.

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