Abstract: Nonmonolithic laser arrays having a plurality of lasing elements mounted on one or more spacers which protrude from a thermally conductive support. The spacers ensure the accurate location and separation of the lasing elements, facilitate the orientation of the output laser beams, and enable low thermal, optical, and electrical cross-talk between the lasing elements.

Abstract: A self biasable transfer roll system for transferring toner particles from an image support surface to a copy substrate, including a conformable roll member, comprising a core having a layer of compressible material radially surrounding the core, and a peripheral surface layer comprising piezoelectric material positioned along a circumference of the roll member for generating an electric field when deformed.

Abstract: A method and apparatus for maintaining a print quality of an ink jet apparatus comprises selecting one of a plurality of different pulse signals to apply to at least one heating element. The heating element is energized with the selected pulse signal. An actual voltage drop is then measured across the heating element. The actual voltage drop is subsequently compared with a desired voltage drop. Then, a new pulse signal is selected to energize the heating element based on the results of the comparison. The repetitive process continues until the actual voltage drop is substantially equal to the desired voltage drop. In another embodiment, a bubble sensor is used to determine whether a bubble has been formed over the heating element.

Abstract: There is disclosed a raster output scanner for a color printing system which utilizes an indexed rotating polygon mirror in order to scan each given scan line from each latent image by a given facet in order to reduce misregistration caused by facet surfaces of a rotating polygon mirror.

Abstract: A photoconditive imaging member comprised of a supporting substrate, a photogenerating layer comprised of a photogenerating pigment, or photogenerating pigments dispersed in a polystyrene/poly(methacrylic acid) (A.sub.n -B.sub.m) block copolymer wherein A is the anchoring block, B is the steric stabilizing block, and n and m represent the number of segments; and a charge transport layer.

Abstract: There is provided a method of labeling a job in a printing system. The method includes the steps of storing, in memory, a list of electronic labels and displaying, on a display screen, both the list of electronic labels and a print outline with a selected identifiable area. The selected identifiable area is positionable on the print outline for representing a relative size, location and orientation of an area on a print upon which a selected one of the electronic labels is to be printed, and the displaying step includes applying a grid to the list so that a series of cells is superposed relative to the the electronic labels. In operation, a first location at which a copy of the selected electronic label is to be printed on a selected one of a plurality of prints is indicated and a plurality of prints, with the selected electronic label printed on the selected print at the first location, is produced when all of the selected electronic label is disposed in a selected one of the series of cells.

Abstract: A method of decompressing a document image compressed with JPEG ADCT and a subsequent statistical encoding method, includes an iterative processing step, which filters the image to correct for compression/decompression artifacts, and subsequently checks the ADCT coefficients of the filtered image to determine whether the filtered image is a possible one, given the received original ADCT coefficients and Q-Table description. In such an arrangement, the iterative process step can be terminated at a preselected number of iterations based on the measured size of the statistical encoding prior to removing the statistical encoding.

Abstract: A solid area process control for scavengeless development using a transport roll-to-donor roll DC bias as a control parameter in an electrophotographic printing machine is disclosed. The process develops a latent image of a solid area toner patch on a photoconductive belt. Once the patch is developed, the patch is measured with an infrared reflectance type sensor. The measured development mass is compared to a target value stored in the machine memory. A test of the comparison is performed by the process. If the result of the test is less than the target value, the transport roll-to-donor roll bias is increased and the process ends. If the result is more than the target value, the transport roll-to-donor roll bias is decreased and the process ends, otherwise the process stops because the measured development is acceptable. The process is run at predetermined intervals to maintain constant output from the electrophotographic printing machine.

Abstract: An electrostatographic imaging member assembly comprising a hollow electrostatographic imaging drum having a first end and a second end, at least one coating on the drum extending from the first end of the drum to the second end of the drum, the coating having an outer electrostatographic imaging surface, drum supporting hubs mounted on the first end of the drum and the second end of the drum, the drum supporting hubs comprising a disk shaped member comprising a disk shaped segment having an exposed annular landing strip surface parallel to and flush with the electrostatographic imaging surface, the annular landing strip surface having a width of at least about 3 millimeters and having an imaginary axis coextensive with an imaginary axis of the drum. The electrostatographic imaging member assembly may be utilized in electrostatographic imaging apparatus in which the hubs support electrostatographic imaging apparatus subassembly components.

Abstract: A process for the preparation of Type V hydroxygallium phthalocyanine which comprises the in situ formation of an alkoxy-bridged gallium phthalocyanine dimer, hydrolyzing said alkoxy-bridged gallium phthalocyanine dimer to hydroxygallium phthalocyanine, and subsequently converting the hydroxygallium phthalocyanine product obtained to Type V hydroxygallium phthalocyanine.

Abstract: A digital halftoning system with balance error diffusion, converts a scanline at a time of an image from a first pixel density to a second pixel density, where the first pixel density is greater than the second pixel density. Quantization errors resulting from the conversion is dispersed to surrounding pixels, in a manner which is more symmetric than standard error diffusion techniques. Initially, errors are dispersed in a conventional manner during a first scanline pass or forward scanline pass of an image. Subsequently, errors are again dispersed during a second scanline pass or backwards scanline pass. The two pass error diffusion technique insures that error propagated throughout the image do not create or form correlated artifacts such as worms in the converted image.

Abstract: An electrophotographic imaging member having a perylene-containing charge generating layer is prepared by forming a dispersion of a perylene charge generating material in an acetate solvent and applying the dispersion to an electrophotographic imaging member layer by solution coating. An imaging member is prepared by forming an interphase region between a charge generating layer and a charge transport layer.

Abstract: A wafer design and dicing technique for creating semiconductor chips from wafers. A succession of oxide layers are deposited in first and second regions of a surface of a silicon substrate. The regions are separated by a street having no oxide layers therein, and the successive oxide layers form a vertical wall with a surface normal to the surface of the silicon substrate. A shock-absorbent material is deposited in the street, forming a concave meniscus therein. The shock-absorbent material retards the trajectories of silicon particles set into motion when the wafer is diced into chips.

Abstract: An automatically self-aligning charging device assembly for producing a layer of charge on a charge holding surface in alignment with a document registration position on the platen of a machine. The assembly includes a charging element having a start-of-charging position thereto, and a housing enclosing the charging element. The assembly also includes a stop member mounted to the frame of the machine at a first side of the platen for contacting a first end of the housing at a desired point so as to automatically align the start-of-charging position of the charging element with the document registration position. A resilient force applying member connected to a second end of the housing automatically absorbs corrective adjustments to a location of the start-of-charging position of the charging element relative to the document registration position on the platen, thereby automatically aligning the start-of-charging position with the document registration position.

Abstract: A method of fabricating a cylindrical device comprising having at least one distinct outer layer comprising providing a preformed rigid cylindrical support drum having a predetermined outer circumference, a first end and a second end, providing a flexible belt having an inner circumference at least about 0.05 percent smaller than the outer circumference of the support drum, circumferentially expanding the belt with a flowing fluid under pressure until the circumference of the inner surface of the belt adjacent the first end is stretched to a new dimension at least about 0.

Abstract: An apparatus in which sheet basis weight is determined as a function of a change in angular velocity of a roller defining a nip through which the sheet passes. The sheet basis weight is calculated in response to the change in angular velocity of the roll before and after the sheet enters the nip. In an electrophotographic printing machine, the change in angular velocity of the fuser roll or pressure roll may be used to calculate the sheet basis weight.

Abstract: A process for preparation of conductive carrier particles which comprises mixing carrier core with a first polymer pair and a second polymer pair, heating the mixture, and cooling the mixture; and wherein the first and second polymer pair each contain an insulating polymer and a conductive polymer and wherein the carrier conductivity thereof is from about 10.sup.-6 to about 10.sup.-14 (ohm-cm).sup.-1.

Abstract: A sensor having a shutter mounted upon a shaft for rotation within a housing in opposition to a light path between an LED and photodetector is described. A potion of the shaft extends outside the housing connected to an elongated arm. A runner secured to the elongated arm, engages a moving photosensitive surface and deviations of the edge position of the photosensitive surface rotate the shutter in relation to the light path between the LED and photodetector for tracking the edge position of the moving photosensitive surface by providing signals representing shutter position.

Abstract: An apparatus for developing an electrostatic latent image with liquid developing material. The apparatus includes a liquid developing material applicator, wherein a single piece housing fabricated from a non-conductive material is provided for defining an elongated aperture adapted for transporting liquid developing material into contact with the image on the surface of a photoreceptive member, the housing further including a planar surface adjacent the elongated aperture for providing a liquid developing material application region in which the liquid developing material can flow freely in contact with the photoreceptive member. A developing roll situated adjacent to and downstream from the liquid developing material is also provided for for attracting the liquid developing material to image areas of the electrostatic latent image.

Abstract: A liquid electrophotographic reproduction machine for producing a toner image reproduction on a copy sheet. The reproduction machine includes an image bearing member movable along a process path, latent image forming devices mounted along the process path for forming a latent image electrostatically on the image bearing member, and a development unit. The development unit is mounted along the process path and contains liquid developer material including a liquid carrier and charged dispersed toner particles for developing the latent image to form a toner image. The reproduction machine also includes a transfix assembly mounted along the process path for transferring and simultaneously heating and fixing the toner image onto a copy sheet.