Xerox Corporation

Joel M Pollack

Frank C Genovese

John B Flannery

Richard F Bergen

James W Lannom

A vacuum fluorescent printing device is disclosed having cathode filaments, a plurality of multiplexed control grids and a skewed matrix of addressable phosphor elements configured on an anode in such a fashion as to enable convenient electrical connection plus imagewise recombination of emitted light from said phosphor elements into a high resolution array for the purpose of directing this collection of addressable points of light onto a single line of a photoreceptor drum or belt thereby enabling a xerographic image to be generated. An equipotential screen grid is located between one of said plurality of grids and the anode in order to reduce voltage swings needed for cutoff of either grid for phosphor addressing purposes.

Gated grid structure for a vacuum fluorescent printing device

A vacuum fluorescent printing device is disclosed having cathode filaments, a plurality of multiplexed control grids and a skewed matrix of addressable phosphor elements configured on a fiber optic plate in such a fashion as to enable light emitted from the phosphor elements to be directed edgewise through the fiber optic plate to expose a photosensitive member.

Edge-out matrix light bar coupling apparatus and method using a

An orifice plate for use in ink jet printing machines is produced by an electroplating technique. The plate is bilaminar with nickel being plated onto copper to form a substantially rigid structure.

Orifice plate for ink jet printing machines

An imaging method which is comprised of a spatially varying imagewise output intensity for a corresponding imaging input. An imaging member comprising between two electrodes a photoconductor in contact with an about 1 to about 6 micron thick layer of nematic liquid crystalline material, which in the absence of an electrical field is in the homogeneous texture, and having negative dielectric anisotropy is utilized. A d.c. voltage above the parallel variable grating mode threshold for the nematic liquid crystalline material is applied between the two electrodes of the imaging member and, while the voltage is applied, the photoconductor is exposed to imagewise configured actinic electromagnetic radiation from a first radiation source. The actinic radiation causes the voltage to increase across portions of the nematic liquid crystalline layer in electrical contact with regions of the photoconductor exposed to the actinic radiation. The increase in voltage across these portions of the liquid crystalline material is sufficient to cause cylindrical, vortical domains of molecules of the nematic liquid crystalline material to form with their long axes parallel to the initial direction of homogeneous alignment (a parallel variable grating mode). The spatial frequency of the vortical domains varies dynamically with the intensity of the actinic electromagnetic radiation. From a second radiation source, electromagnetic radiation which is non-actinic to the photoconductor by virtue of either the photoconductor or imaging member structure, is modified by the imagewise configured liquid crystalline texture resulting in a projection image of second source radiation corresponding to the imagewise configured first source electromagnetic radiation.

Imaging method

Bistable deflection of a beam of light into and out from a layer of nematic liquid crystalline material having negative dielectric anisotropy and having a thickness of from about 1 micron to about 6 microns is achieved by providing the nematic liquid crystalline material in the parallel variable grating mode between two electrodes, the nematic being under an applied voltage between the two electrodes at a voltage level above the threshold voltage level for parallel variable diffraction mode for said nematic liquid crystalline material, and increasing and decreasing the applied voltage so that light diffracted by the parallel variable grating mode nematic is deflected at an angle which either exceeds or is less than the critical angle between the layer of nematic liquid crystalline material and one of the electrodes. When the deflection of diffracted light is increased in excess of the critical angle, the incident light is totally reflected within the nematic layer; and, when the deflection angle of the diffracted light is decreased below the critical angle, the incident light is diffracted through the nematic layer and the one electrode. The bistable deflection can be utilized in a reproduction device which converts a data chain of electrical signals into an image and in integrated optics.

Bistable deflection system

Deflection and modulation of monochromatic light is achieved by providing an about 1 micron to about 6 micron thick layer of homogeneously aligned nematic liquid crystalline material having negative dielectric anisotropy between two transparent electrodes; applying a voltage between the two electrodes at a voltage level above the threshold voltage level for parallel variable diffraction mode for said nematic liquid crystalline material; directing a ribbon or beam of monochromatic light into the layer of nematic liquid crystalline material and coplanar therewith; and increasing and decreasing the applied voltage so that light diffracted by the parallel variable grating mode nematic is deflected at an angle which either exceeds or is less than a critical angle .theta..sub.c. When the deflection of diffracted light is increased in excess of critical angle .theta..sub.c the incident monochromatic light is diffracted through the nematic layer and the electrodes; and, when the deflection angle of the diffracted light is decreased below critical angle .theta..sub.c the incident monochromatic light is totally reflected within the nematic layer provided the voltage level is above the parallel variable grating mode level. At voltages below the parallel variable grating more threshold voltage level, the incident monochromatic light passes through the layer of nematic liquid crystalline material without reflection. Imaging devices utilizing the above deflection and modulation are disclosed.

Liquid crystalline deflection and modulation system

A novel projection imaging method. An imaging member is utilized comprising between two electrodes a negative photoconductor in contact with an about 1 to about 6 micron thick layer of nematic liquid crystalline material which, in the absence of an electrical field is provided in the homogeneous texture, and of negative dielectric anisotropy. A d.c. voltage above the parallel variable grating mode threshold for the nematic liquid crystalline material is applied between the two electrodes of the imaging member and the entire nematic layer goes into the parallel variable grating mode. While the voltage is applied, the negative photoconductor is exposed to imagewise configured actinic electromagnetic radiation and becomes more resistive in exposed areas. The actinic radiation causes the voltage to decrease across portions of the nematic liquid crystalline layer in contact with regions of the negative photoconductor exposed to the actinic radiation. The decrease in voltage across these portions of the liquid crystalline material is sufficient to cause cylindrical, vortical domains of molecules of the nematic liquid crystalline material in the parallel variable grating mode to disappear in imagewise configuration. Conventional Schlieren readout utilizing light linearly polarized in a direction orthogonal to the major axes of the vortical domains prevents unwanted exposure of the negative photoconductor while simultaneously maintaining the resistance of the negative photoconductor in imagewise configuration. Selective write and erase capabilities are provided.

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Rochester, NY, United States of America

Joel M Pollack