Abstract: An imaging system wherein a migration-type imaging member comprising a softenable layer containing agglomerable migration marking material is provided, and the member is exposed to an image pattern of electromagnetic radiation of sufficient energy to cause a simultaneous imagewise migration at least in depth in the softenable layer and agglomeration of the agglomerable migration marking material in the imagewise exposed areas of the imaging member. In another embodiment, a microscopically discontinuous layer of imaging material on a stable substrate is agglomeration or evaporation imaged by the inventive system.

Abstract: An imaging system wherein a migration-type imaging member comprising a softenable layer containing agglomerable migration marking material is provided, and the member is exposed to an image pattern of electromagnetic radiation of sufficient energy to cause a simultaneous imagewise migration at least in depth in the softenable layer and agglomeration of the agglomerable migration marking material in the imagewise exposed areas of the imaging member. In another embodiment, a microscopically discontinuous layer of imaging material in a stable substrate is agglomeration or evaporation imaged by the inventive system.

Abstract: Alignment films provided on a supportive substrate in accordance with the Janning technique exhibit birefringence wherein plane polarized light in passing through the alignment film becomes elliptically polarized. Birefringence compensation is provided by depositing a second alignment film on the other side of the supportive substrate in a direction substantially orthogonal to the deposition direction of the first alignment film, the second alignment film having a thickness substantially equal to that of the first alignment film.

Abstract: An imaging member comprising an agglomerable layer on a substrate is agglomerated in image configuration to cause the formation of larger agglomerates in the agglomerated areas which usually produces a relative transparentizing or a color change in the agglomerated areas. This imaging process is followed by contacting the imaged member, usually uniformly, with a solvent for the agglomerable material or a chemical reactant for the agglomerable material to dissolve away agglomerable material in the unagglomerated (which herein includes relatively unagglomerated compared to the agglomerated areas) areas or chemically react with agglomerable material in the unagglomerated areas, respectively at a faster rate than in the agglomerated areas.

Abstract: A composition responsive to magnetic fields and comprising a ferrofluid and metal flakes. The metal flakes align with the ferrofluid in response to magnetic lines of force and along the magnetic lines of force. Excellent contrast is provided between portions of the composition wherein the metal flakes are seen along edges or ends and portions of the composition wherein the broad surface area of the flakes are presented to view.

Abstract: A mixture of the Grandjean texture and the focal-conic texture of the cholesteric mesophase is created by applying an electrical field to a liquid crystalline material in either the focal-conic or Grandjean texture of the cholesteric mesophase of a magnitude sufficient to transform the liquid crystalline material from the cholesteric mesophase to the nematic mesophase; and, decreasing the magnitude of said electrical field over a period of time effective to transform the liquid crystalline material from the nematic mesophase to a mixture of the Grandjean and focal-conic textures of the cholesteric mesophase.

Abstract: An imaging system wherein a migration-type imaging member comprising a softenable layer containing agglomerable migration marking material is provided, and the member is exposed to an image pattern of electromagnetic radiation of sufficient energy to cause a simultaneous imagewise migration at least in depth in the softenable layer and agglomeration of the agglomerable migration marking material in the imagewise exposed areas of the imaging member. In another embodiment, a microscopically discontinuous layer of imaging material on a stable substrate is agglomeration or evaporation imaged by the inventive system.

Abstract: An imaging member comprising an agglomerable layer on and not embedded in a substrate is agglomerated in image configuration to cause relative transparentizing or a color change and the formation of larger agglomerates in the agglomerated areas. This imaging process is followed by removal of the agglomerates from the agglomerated areas.

Abstract: A magnetic display comprising, between two magnetic field permeable substrates, a ferrofluid and metal flakes, one of the substrates being provided with one or more selectively energizable electro-magnets.

Abstract: An apparatus and method for electrostatic copying in which the original document is transported on a conductive grounded plate to several processing stations. The document is positioned with its image or front side on the surface of the plate. At a charging station, the back side of the document receives a uniform electrostatic charge which, in the image regions, leaks off through the plate to provide a latent electrostatic image. The document is then transported to a developing station for development of the latent image with toner and then to a transfer station where the toner is transferred to a final support material and fused to such material. Residual toner is then removed at a cleaning station.

Abstract: A magnetic imaging system wherein a magnetizable recording member comprising a substrate overcoated with a magnetic recording layer of magnetic particles dispersed in a binder is exposed to high energy light pulses of sufficient energy effective to cause or allow the removal of said magnetic recording layer in exposed regions thereof. Imagewise configured high energy light pulses result in the removal of imagewise configured portions of the magnetic recording layer. Removal of portions of the magnetic recording layer can occur either before or after magnetization of the magnetizable recording member and upon development with magnetic toner, a complementary magnetic toner image is formed and can be transferred to a receiving medium to form hard copy. The system is particularly applicable to the formation of a magnetic master which is used to form the same magnetic toner image numerous times.

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: 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: 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: 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.

Abstract: A system which transforms a liquid crystal composition having a mixture of cholesteric liquid crystal or other optically active materials and nematic liquid crystal materials from an electrically induced dynamic scattering state into an aligned nematic state by changing variables of an applied electrical field, and an imaging system wherein such a liquid crystal member is imaged in a desired image configuration by such an electrical field-induced transition system. Such systems exhibit high optical contrast and may be viewed without the aid of light polarizing devices.

Abstract: A liquid crystalline composition comprising an optically active material and a nematic liquid crystalline material having negative dielectric anisotropy and optionally an ionizable salt, and capable of undergoing the electrohydrodynamic induced transition from the Grandjean texture to the focal-conic texture, is initially provided in the Grandjean Texture. Current is passed through the liquid crystalline composition up to its region of maximum response to electrical stimulus. A second current is then passed through the liquid crystalline composition until at least a partial optical conversion is achieved in response to electrical stimulus of the liquid crystalline composition.

Abstract: The electrical resistivity of pure trans-stilbene nematic liquid crystalline materials is altered by exposure to ultraviolet radiation. These stilbenes can therefore be made to dynamically scatter uniformly or in imagewise configuration and can be added to liquid crystalline compositions to alter the compositions' resistivities.

Abstract: A system which transforms a liquid crystal composition having a mixture of cholesteric liquid crystal or other optically active materials and nematic liquid crystal materials from an electrically induced dynamic scattering state into an aligned nematic state by changing variables of an applied electrical field, and an imaging system wherein such a liquid crystal member is imaged in a desired image configuration by such an electrical field-induced transition system. Such systems exhibit high optical contrast and may be viewed without the aid of light polarizing devices.

Abstract: Liquid crystalline compositions comprising dielectrically negative nematic liquid crystalline materials from about 0.4 percent by weight to about 3 percent by weight optically active materials, in contact with an aligning agent, and characterized by a helical pitch to layer thickness ratio of from about 1 to about 10 are transformed from an initially homeotropic or homogeneous texture into a novel stable spherulitic texture upon removal of an applied D.C. or low frequency A.C. electrical field. Erasure and imaging of the novel spherulitic texture are disclosed.