Abstract: Lithographic masters for improved image quality in direct printing process are provided. The masters are formed with a relatively soft elastomeric or resilient layer on a suitable supporting master substrate. An image layer of up to 2.5 microns is supported by the resilient layer. A resilient blanket supports the printing master or receiver sheet.

Abstract: Disclosed is a method of forming a layer of particulate trigonal selenium dispersed in a polymeric matrix. The method involves:(a) forming a solution containing:I. dibenzoyl peroxide,Ii. an organo selenium compound which interacts with dibenzoyl peroxide to form zero valent selenium, andIii. a matrix polymer which is substantially non-reactive with dibenzoyl peroxide and the organo selenium compound,in a volatile solvent;(b) applying the solution to a substrate in the form of a thin film;(c) allowing the dibenzoyl peroxide and organo selenium compound to react thereby forming amorphous zero valent selenium particles dispersed in the matrix polymer; and(d) heating the matrix polymer/zero valent selenium combination to a temperature and for a time sufficient to convert the amorphous zero valent selenium to its crystalline, trigonal form.

Abstract: A development apparatus in which a plurality of differently colored particles are dispensed into a common sump. Differently colored particles are dispensed in a pre-selected ratio to form a resultant mixture of particles in the sump having a pre-selected color. This mixture is subsequently deposited on a latent image rendering the image visible in the pre-selected color.

Abstract: A finely divided imaging composition is provided comprising at least two differently colored pigment particles dispersed and bound in a polymeric matrix, at least one of said particles of said matrix being electrically photosensitive, said imaging composition exhibiting the resultant color of the differently colored pigments and being capable of forming images in said resultant color without color or particle separation. Images formed of this compositon can be selectively modified.

Abstract: A copier platen cover, adapted to prevent displacement of an original document as the platen cover is closed, comprising, on the side of the cover which contacts the original, an elastic layer having at least one raised portion.

Abstract: An apparatus in which the developability of a development system comprising a mixture of particles having at least two different colors is regulated. The quantity of each of the differently colored particles is maintained at a pre-scribed level to form a mixture of particles having a pre-determined color.

Abstract: An electrophotographic printing machine in which the platen thereof is a field lens. In the opaque reproduction mode, the original document is positioned on the platen in a light receiving relationship with the illumination system. The presence of the field lens does not interfere with the opaque copying mode of the printing machine. When a transparency is being reproduced, the light image of the transparency is projected through the platen. The field lens converges the diverging light rays of the transparency light image.

Abstract: An apparatus in which a flexible web cleans contaminants from a member. A pressure member holds a portion of the flexible web in engagement with the member to remove the contaminants therefrom. The web is prevented from being entrained erroneously about the pressure member. The member being cleaned is preferably a photoconductive surface.

Abstract: The present invention is directed toward a color electrophotographic imaging process and a method for extending the range capabilities of said process. The process includes providing a document screen adapted to be used at the exposure station proximate to the image face of a document to be copied, such that light reflected from the screened document is passed through a lens system and imaged onto a photosensitive member. The document screen consists of a clear transparent base member having a dot pattern comprising dots of at least one color, preferably dots of two or more different colors. The frequency of the like dots is such that the optical system employed in the electrophotographic process passes spatial frequencies reflected from the screened original at the fundamental screen frequency but attenuates the harmonic spatial frequencies.

Abstract: There is disclosed an electrophotographic imaging member comprising a conductive substrate having coated thereover an interfacial barrier layer comprising phthalocyanine in an electrically insulating binder resin which layer is overcoated with a photoconductive layer comprising selenium. The member has substantially panchromatic response. The interfacial barrier layer comprising phthalocyanine in a binder acts as a surprisingly effective barrier layer against the injection of electrons from metallic bases.

Abstract: A novel liquid developing system is disclosed which employs a rigid member adapted so that it is resilient when employed in operating contact with another rigid member. The resilient member is normally arcuate in configuration and includes a rigid support member and a flexible arcuate surface spaced apart by a resilient member and a means for tensioning the resilient member so that the spacing tension is reduced in an amount sufficient to allow easy movement of the flexible surface with respect to the resilient member.

Abstract: A reproducing machine in which a particle receiving member has charged conductive particles deposited thereon in image configuration. The particles are transferred from the receiving member to a copy sheet with the charge exchanged between the particles and the sheet being controlled to prevent repulsion of the particles from the sheet during the transfer of the particles thereto.

Abstract: An image recording member in which a pair of conductive members are disposed in a photoconductive member contiguous with a support member. Each of the conductive members has an insulating coating thereon for electrical isolation thereof. An electrical potential is applied to one of the conductive members for creating a potential difference between the pair of conductive members. This forms an electrical field through the photoconductive member.

Abstract: An apparatus in which a powder pattern deposited on a support material is permanently affixed thereto. The support material is heated during the movement thereof into thermal communication with a radiant energy output. In this manner, the powder pattern is coalesced and fixed permanently to the support material.

Abstract: An apparatus in which a latent image is developed with particles having the resistivity thereof varying as a function of the electrical field applied thereto. The electrical field generated during development is of sufficient magnitude to render the particles substantially conductive.

Abstract: A photoreceptor having improved flexibility and durability comprising a metal- or metal-coated substrate and an inorganic photoconductor layer in charge blocking contact with the substrate, the photoreceptor being obtained by initially bombarding a grounded or floating substrate with electrons and non-metallic high energy ions in the presence of oxygen and exposing the resulting clean oxide-coated substrate to a vapor cloud of photoconductor material bombarded by electrons and non-metallic ions to form high energy ions, the vapor cloud being initially obtained by evaporation from a crucible in a coated under glow discharge conditions; the latter functional step being optionally effected in combination with at least part of the initial bombardment step.

Abstract: An apparatus in which at least a pair of developer rollers deposit toner particles on an electrostatic latent image recorded on a photoconductive member to render it visible. One of the rollers rotates at a first tangential velocity being spaced a first distance from the photoconductive member. The other roller rotates at a second tangential velocity being spaced a second distance from the photoconductive member. The second tangential velocity is greater than the first tangential velocity with the second distance being less than the first distance.

Abstract: Disclosed is an improved magnetic brush development system for flexible photoreceptors which includes a magnetic brush development assembly positioned at a location remote from the latent image-bearing surface of the flexible photoreceptor and deflection means positioned adjacent to the non-imaging surface of the photoreceptor. Upon advancement of the latent image into a development zone defined by the magnetic brush development assembly and the deflection means, the machine logic activates the deflection means and thereby results in engagement of the magnetic brush assembly and the portion of the flexible photoreceptor bearing the latent image. The deflection means is preferably provided with a plurality of apertures at the interface of the deflection means and the flexible photoreceptor.

Abstract: An apparatus in which a photoconductive belt is advanced to move incremental unused portions thereof to an operative location as incremental used portions move to an inoperative location. The apparatus includes a segmented support frame having a supply station storing unused portions of the photoconductive belt and a receiving station storing used portions thereof associated with each segment.

Abstract: An optical system in which a modulated light image of an original document is projected onto a receiving member. The optical system includes a lens and an opaque member having an array of apertures therein associated therewith to improve the light transmission properties thereof.