Abstract: An imaging system comprising providing an imaging member comprising an agglomerable layer in contact with an imagewise hardenable-softenable layer and imagewise hardening said member. An image is developed by imagewise softening said member to cause relative transparentizing in the imagewise softened areas due to an agglomeration of the agglomerable layer in the imagewise softened portions of said member.

Abstract: A magneto-optic cell comprising a composition responsive to magnetic fields. The composition comprises a ferrofluid and metal flakes which align with the ferrofluid in response to magnetic lines of force and along the magnetic lines of force. Detection of the presence of a magnetic field is thereby provided.

Abstract: Process and apparatus for creating a magnetic latent image capable of being rendered visible with magnetic toner without image deletion. An area of interest on a magnetizable member is recorded with a first substantially uniform spatial pattern of magnetic transitions having a transition wavelength .lambda..sub.1 capable of retaining magnetic toner on the magnetizable member and effective to substantially completely cover the area of interest upon development with magnetic toner. A second spatial pattern of magnetic transitions having a transition wavelength .lambda..sub.2 is then recorded in the area of interest in one of imagewise and background configuration; the second spatial pattern of magnetic transitions having a transition wavelength .lambda..sub.2 incapable of retaining said magnetic toner on said magnetizable member, wherein .lambda..sub.1 is greater than .lambda..sub.

Abstract: 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.

Abstract: 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.

Abstract: In a magnetic scavenging system for recovering airborne magnetic toner from a magnetizable recording member, alternating polarity magnetic field producing means are provided in the path of flow of toner between a magnetic scavenger and a toner reservoir.

Abstract: An imaging system is disclosed wherein unpigmented transparent xerographic toner images are used to make color and full color pictorial transparencies and selected hard copy according to specific toner-tacking methods.

Abstract: An optically addressed light valve is disclosed which is cabable of being read-out at very high light intensities during the write-in cycle without need for an optical blocking layer. The system is based on the combination of a reflective photoconductor and an electro-optically active medium and exploits the characteristics of space charge limited currents in photoconductors of high optical absorption of actinic wavelengths.

Abstract: An improved magnetic interpositive imaging method is provided by creating an electrostatic latent image in a photoconductive member comprising photoconductive material dispersed in a binder; developing by touchdown development said electrostatic latent image with toner comprising from about 10% to about 60% by volume hard magnetic material; fixing said toner to said photoconductive binder; magnetizing said fixed toner; and, transferring the magnetic signal from said magnetized, fixed toner by thermoremanent transfer of magnetization to a magnetizable recording medium.

Abstract: Apparatus for viewing latent magnetic images on recorded magnetizable recording members. The apparatus comprises means for advancing a magnetizable recording member bearing a latent magnetic image into a detection station at which a magneto-optic cell provides a visible display of the latent magnetic image. Optionally, a projection system directs light in reflection from the visible display to a back lighted projection screen.

Abstract: A thermoremanent magnetographic imaging apparatus is disclosed. The apparatus includes an imaging transfer station which thermoremanently copies a graphic representation from a slave web onto the magnetizable surface of a master web. The thermomagnetic transfer is produced by exposing the slave and master webs while in intimate contact to a single intense burst of radiation from a flash lamp. The flash lamp is coaxially located within a transparent cylindrical carriage means which peripherally supports the slave and master webs during a full frame transfer process. Dual locking assemblies firmly hold the slave web and master web motionless during the thermomagnetic process to aid in the prevention of registration problems.

Abstract: An imaging system comprising providing an imaging member comprising an agglomerable layer contacting a softenable layer and imagewise softening said member to cause relative transparentizing of said member in softened areas due to an agglomeration of the agglomerable layer in softened portions of said member.

Abstract: A thermoremanent imaging apparatus for magnetically recording graphic information is disclosed. An elongated light source with a substantial infra-red and visible radiation spectrum is used to produce a high energy flash exposure of a magnetic surface. The light source is co-axially located within a transparent cylindrical transport means which carries the magnetic surface around its periphery. A uniform intensity of energy from the flash exposure over the entire magnetic surface is provided by reflective energy deflecting means placed in opposition along the axis of the transport means.

Abstract: A magnetographic printing apparatus is disclosed which uses an electronically generated information stream to produce a visually readable image on a copy output medium. The high speed transfer of input information to the copy medium is accomplished by the direct writing of information pages with a magnetic write head less than the width of a page onto a magnetic buffer web. The latent magnetic image on the buffer web is transferred to a copy web wherein the pages are developed onto the copy medium at speeds approximating the direct writing time.

Abstract: Vacuum removal means for removing excessive developer material from a member having a latent magnetic image developed with magnetic developer material. The vacuum removal means comprises a chamber having entrance and exit ports of predetermined cross-sectional area such that the ratio of entrance port to exit port is sufficiently small to assure substantially uniform air flow across the entrance port when the chamber is subjected to negative pressure through the exit port. The entrance port of the chamber is in communication with means for subjecting the developed surface of the member to a substantially uniform shearing air flow when the chamber is subjected to the negative pressure. A second entrance port of equal cross-sectional area to the first entrance port may be provided to the chamber in association with gating means for selectively varying the cross-sectional area of each entrance port while maintaining a constant combined cross-sectional area for the entrance ports.

Abstract: A system for transforming an optically negative liquid crystalline composition from the focal-conic texture state to the Grandjean texture state by means of an applied electrical field which may be a D.C. electrical field or a relatively low frequency A.C. electrical field. Imaging and display systems wherein a member comprising a film of an optically negative liquid crystalline composition is imaged in a desired image configuration by the electrical field induced texture transformation system are also described.

Abstract: A system for transforming an optically negative liquid crystalline composition from the focal-conic texture state to the Grandjean texture state by means of an applied electrical field which may be a D.C. electrical field or a relatively low frequency A.C. electrical field. Imaging and display systems wherein a member comprising a film of an optically negative liquid crystalline composition is imaged in a desired image configuration by the electrical field induced texture transformation system are also described.

Abstract: A direct current liquid crystal display device for reflection viewing comprises a dielectric mirror having at least one pair of titanium dioxide and silicon dioxide layers, the titanium dioxide layer being in contact with a layer of liquid crystalline composition, between two electrodes.

Abstract: Coding of a group of characters for recognition by a machine and by a human viewer is provided by coloring each character with a predetermined plurality of colors arranged in predetermined locations within a character configuration. Each character configuration in a set of characters is segregated into a plurality of sectors and each sector is coded by a predetermined one of a plurality of colors which differs from the color coding of an adjacent sector. Apparatus for forming the color-coded characters by printing and by a photoelectrophoretic process is disclosed. Apparatus for automatically recognizing characters colored according to the predetermined code comprise color detecting elements positioned in an array at a reading station for generating output electrical signals representative of the color-sector coding and circuit means coupled to the detection means for translating the color-sector signals into an electrical signal representative of a character in a set.

Abstract: An imaging member to be viewed in reflection comprises a front surface reflection rejection layer on one side of an imaging layer and a reflection layer on the other side of the imaging layer, the reflection rejection layer comprising one or more rectangular blocks of transparent material having a height, H, and a base, L, characterized by the relationship H = 3/2 L TAN .theta.' + 2 n L TAN .theta.', where .theta.' is the angle of refraction of readout radiation into said transparent material and n is selected from the group consisting of zero and positive integers.