Optically addressed light valve system with two dielectric mirrors separated by a light separating element
AssigneeXerox Corporation
InventorWerner E. Haas
Life of this patent
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Abstract
A light valve comprising a first transparent electrically insulating layer, a first transparent electrically conductive layer, an electro-optic imaging medium layer, a first dielectric mirror, a light separating layer comprising an organic dye, organic pigment, or a semiconductor selected from the group consisting of As, Se, Te, Bi, Sb, Fe, Si, S or alloys thereof, a second dielectric mirror layer, a photoconductor layer, a second transparent electrically conductive layer and a second transparent layer. This light valve may be utilized in systems which include an imaging light source and a read-out light source.
Claims18
A light valve comprising a first transparent electrically insulating layer, a first transparent electrically conductive layer, an electro-optic imaging medium layer, a first dielectric mirror, a light separating layer comprising an organic dye, organic pigment, or semiconductor selected from the group consisting of As, Se, Te, Bi, Sb, Ge, Si, S or alloys thereof, a second dielectric mirror, a photoconductor layer selected from the group consisting of selenium, selenium alloys and amorphous silicon, a second transparent electrically conductive layer and a second transparent layer, wherein said separating layer absorbs radiation to said photoconductor layer and wherein said separating layer is at least as electrically insulating as said photoconductor layer in the absence of radiation actinic to said photoconductor layer.
Imaging apparatus comprising:
- a. light valve comprising a first transparent electrically insulating layer, a first transparent electrically conductive layer, an electro-optic imaging medium layer, a first dielectric mirror, a light separating layer comprising an organic dye, organic pigment, or semiconductor layer selected from the group consisting of As, Se, Te, Bi, Sb, Ge, Si, S or alloys thereof, a second dielectric mirror, a photoconductor layer selected from the group consisting of selenium, selenium alloys and silicon which is sensitive to actinic radiation, a second transparent electrically conductive layer and a second transparent layer, wherein said separating element absorbs actinic radiation comprising wavelengths between about 4000 angstroms and about 7,000 angstroms and wherein said separating layer is at least as electrically insulating as said photoconductor layer in the dark;
- b. means for applying an alternating voltage between said first transparent electrically conductive layer and said second electrically conductive layer;
- c. means for illuminating said light valve from said second transparent layer side with actinic radiation in imagewise configuration;
- and
- d. means for uniformly illuminating said light valve from said first transparent electrically insulating layer side with broad band radiation which includes actinic radiation having a wavelength between about 4000 angstroms and about 7,500 angstroms;
- said light separating layer having a thickness and coefficient of absorption for said actinic radiation sufficient to maintain the transmission of said actinic radiation through said separating layer to less than about 50 percent upon activation of said means for uniformly illuminating said device.
Dependencies are inferred from the claim text.