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US 4,288,822 AGranted
System for the analysis and the recording of monochromic images
AssigneeThomson-CSF
InventorsMichel Hareng, Serge Le Berre, Pierre Leclerc
Life of this patent
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Abstract
A system comprising means for emitting an analysis beam and a recording beam, the two beams being deflected by common deflection means. The analysis beam scans the document carrying the image to be analyzed and a detecting photocell provides an electrical signal. The recording beam scans a liquid crystal cell, where it records the image in synchronism with analysis in dependence upon a modulation of the thermo-optical effects induced in the liquid crystal. This modulation is provided by the electrical signal.
Claims6
A system for reproducing monochromic images carried by a support;
- said system comprising:
- a liquid crystal cell comprising a layer of a material having a smectic phase;
- said layer being enclosed between two electrodes and maintained in said smectic phase;
- only one radiation source providing a single beam;
- optical means, disposed on the path of said beam, for producing from said beam an analyzing light spot on said support and a recording light spot in said liquid crystal cell;
- at least one of said electrodes being transparent for the wavelength of said beam;
- deflecting means, inserted in said path between said radiation source and said optical means, for the scanning of said support by said analyzing spot and the synchronous scanning of said liquid crystal cell by said recording spot;
- photodetecting means, for collecting the light emerging from said support and providing an electrical signal representative of said images;
- electronic means, receiving said electrical signal and supplying an electrical field between said two electrodes, for controlling the diffusing power of said layer;
- said diffusing power being created by a local heating of said liquid crystal induced by said recording spot.
7 more elements
Dependencies are inferred from the claim text.