Abstract:
A system which transforms a cholesteric liquid crystalline material from its Grandjean or ''''disturbed'''' texture state to its focal-conic or ''''undisturbed'''' texture state by an applied electrical field, and an imaging system wherein a cholesteric liquid crystalline member is imaged in a desired image configuration by the electric field-induced texture transition system.
Abstract:
An imaging system wherein an imaging member comprised of toner particles sandwiched between a substrate layer and a spaced surface layer with a resistivity above about 1010 ohm-cm is imaged by contacting a mechanical stylus to the spaced surface layer to triboelectrically create an electrostatic image thereon which is developed by said toner particles. An erasure mode is also set forth wherein a magnetic field, in relative motion to the electrostatic image which has been toned with magnetizable toner, is used to erase the magnetizable toner image and the electrostatic latent image when such is desired.
Abstract:
An electro-optic system wherein a layer of nematic liquid crystalline composition which is optically uniaxial with the optic axis normal to the plane of the layer has an electrical field applied perpendicular to the optic axis of the composition layer thereby inducing optical biaxiality in the composition layer. Electro-optic cells and imaging systems are disclosed using the optic retardation accompanying a field induced change from the uniaxial to the biaxial state.
Abstract:
Variable diffraction of light is provided by utilization of a novel, stable spherulitic texture of a liquid crystalline composition. Light directed upon an array of spherulites in the liquid crystalline composition is diffracted; and the diffraction is changed by applying a voltage across the layer of liquid crystalline composition which results in the change in size of the spherulites. The variable diffraction thus produced can be utilized in optical filters, modulators, color displays and beam splitters.
Abstract:
An imaging system which imagewise transforms a cholesteric liquid crystalline material from its Grandjean or ''''disturbed'''' texture state to its focal-conic or ''''undisturbed'''' texture state by an imagewise applied electrical field whereby a cholesteric liquid crystalline member is imaged in a desired image configuration by the electrical field-induced texture transition system.
Abstract:
AN IMAGING SYSTEM WHEREIN A LIQUID CRYSTALINE IMAGING MATERIAL ON A PHOTOCONDUCTIVE LAYER IS PROVIDED WITH A SUITABLE OVERCOATING, IMAGED BY PROVIDING AN ELECTRICAL LATENT IMAGE ON THE ABOVE DESCRIBED IMAGING MEMBER, AND ERASED BY UNIFORMLY ELECTRICALLY CHARGING THE OVERCOATED SURFACE OF THE IMAGING MEMBER, THEREBY MAKING THE IMAGING MEMBER IMMEDIATELY REUSABLE.
Abstract:
An optical filter system capable of transmitting light at substantially all wavelengths of incident radiation while simultaneously reflecting radiation at a single wavelength band or plurality of wavelength bands within the incident radiation is described. The system employs liquid crystal films having optically negative properties but which are opposite in intrinsic screw sense.
Abstract:
An imaging system wherein an imaging member comprising a material having a cholesteric liquid crystalline phase in its Grandjean or ''''disturbed'''' texture state is thermally imaged by imagewise heating image portions of said imaging material to a temperature at least about the cholesteric liquid crystallineliquid isotropic transition temperature of said material and allowing said heated portions of said imaging material to return to a temperature within the cholesteric liquid crystalline mesophase temperature range of said material whereby said imaged areas assume the focal-conic or ''''undistrubed'''' texture state in the desired image configuration. Images provided by the inventive system are erasible, and the imaging members are reusable.
Abstract:
An imaging system wherein an imaging member comprising a composition comprising a material having a cholesteric liquid crystalline phase with radiation absorptive material dispersed throughout the liquid crystalline material, is provided with the liquid crystalline composition in its Grandjean or ''''disturbed'''' texture state, and the member is thermally imaged by imagewise heating image portions of said imaging material to a temperature at least about the cholesteric liquid-isotropic transition temperature range of the material and allowing said heated portions of said imaging material to return to a temperature within the cholesteric liquid crystalline mesophase temperature range of said material, whereby said imaged areas assume the focal-conic or ''''undisturbed'''' texture state in the desired image configuration. Images provided by the inventive system may be erased, and the imaging members used therein are typically reuseable.