IMAGE INTENSIFIERS
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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Abstract
A storage-type image converter of the photoconductor and liquid crystal kind comprises a photoconductive film arranged beside a film of a mixture of nematic-cholesteric liquid crystals; electrical bias means for successively applying to said films a direct write-in voltage and an alternating erase voltage, an auxiliary light source making it possible to recover the information stored, and stigmatic optical means being provided to project said information on to a viewing screen or on to a photographic substrate or carrier associated with a photocopier.
9 Citations
5 Claims
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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.
- 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;
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2. An image intensifier according to claim 1, wherein said second light source directing means comprise :
- a condenser, a lens and a slit, said lens focussing inside said slit the light emerging from said condenser, and wherein said scattered light direction means comprise a mirror, located between said lens and said second electrode.
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3. An image intensifier as claimed in claim 1, wherein said screen is a large projection screen, a second lens being interposed between said mirror and said screen.
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4. An image intensifier as claimed in claim 1, wherein said screen is the plate of a photocopier.
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5. An image intensifier, according to claim 1, wherein second light source directing means comprise a condenser, and an optical modulating means, for receiving the light emerging from said condenser, a lens for focussing said modulated light, and wherein said scattered light directing means comprise a semi-transparent mirror, reflecting said scattered light, and transmitting said modulated light.
Specification