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IMAGE INTENSIFIERS

  • US 3,798,452 A
  • Filed: 10/27/1971
  • Issued: 03/19/1974
  • Est. Priority Date: 10/30/1970
  • Status: Expired due to Term
First Claim
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1. An image intensifier comprising in combination:

  • a first and a second transparent electrode, parallel to each other, and between said electrodes, a first photoconductor layer, a second layer of a scattering mixture of a cholesteric liquid crystal and of a nematic liquid crystal, said first and second layers filling the space between said electrodes;

    means for directing a first light beam onto said first transparent electrode, for forming a pattern of points of non uniform luminosity ;

    an auxiliary light source and means for directing the light emitted by said source onto said second electrode ;

    a screen and means for directing the light incoming from said light source and scattered by said second layer according to said pattern onto said screen ;

    a three position switch having one output, connected to said electrodes, and a first, a second and a third input, for connecting at will to said electrodes, a d.c. voltage an a.c. voltage and a zero voltage.

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