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Variable grating mode imaging method

  • US 3,980,403 A
  • Filed: 02/25/1975
  • Issued: 09/14/1976
  • Est. Priority Date: 02/25/1975
  • Status: Expired due to Term
First Claim
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1. A method of imaging, comprising:

  • a. sandwiching between two transparent electrodes an imaging member comprising a negative photoconductor in contact with a layer of homogeneously aligned nematic liquid crystalline material;

    said layer of nematic material having a thickness of from about 1 to about 6 microns and said nematic material having negative dielectric anisotropy;

    b. applying a D.C. voltage between said two electrodes above the parallel variable grating mode threshold voltage level for said nematic liquid crystalline material;

    c. uniformly exposing said negative photoconductor to excitation radiation from the photoconductor side of said imaging member in an amount sufficient to form on said layer of nematic liquid crystalline material domains of the parallel variable grating mode, and to image configured actinic radiation which causes deletion of domains and formation of an imagewise configured array of domains in said layer of nematic material; and

    d. reflecting from the liquid crystalline layer side of said imaging member monochromatic light linearly polarized in a direction perpendicular to the major axis of the domains in the layer of nematic material.

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