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MICROFILM PROVIDED WITH COLOR CODES AND DEVICE FOR RECORDING AND REPRODUCING SUCH CODES

  • US 3,835,297 A
  • Filed: 05/09/1973
  • Issued: 09/10/1974
  • Est. Priority Date: 02/05/1970
  • Status: Expired due to Term
First Claim
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1. An information searching device for searching a desired information recording frame of a microfilm, which has a series of information recording frames and iindex codes, in response to said frames, said index codes consisting of color codes composed of at least two colors other than the colors used in said information recording frames, and of a plurality of color marks arranged in the form of matrixes comprising:

  • means for feeding said microfilm, light source means for irradiating said index codes of said microfilm thus fed, a plurality of detecting means provided in the same number as those of said color marks of said index code fOr independently detecting individual colors of each color mark of said index codes, said detecting means having at least one photoelectric element generating a detecting signal sensitive to the spectrum corresponding to a color of said color mark, converting means for switching the spectral sensitivity of said photoelectric element so that said photoelectric element of said detecting means selectively sensitizes to spectrums corresponding to at least two colors of said index codes, control means, actuated by color index code information signals, for controlling said converting means in order that said photoelectric element of said detecting means be sensitized in response to the spectrum corresponding to a color of said color marks forming an index code corresponding to a desired information recording frame to be searched, and microfilm stopping means, coupled to said detecting means, for stopping said microfilm when all of the detecting means generate detecting signals at the same time.

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