Patents Assigned to Xerox
  • Patent number: 5809177
    Abstract: A process eliminates pattern shifting artifacts in a printed image rendered using a hybrid high addressable error diffusion process by perturbing a threshold/image signal value relationship when a multi-level grey level is binarized. The process utilizes a programmable multi-level grey signal modifying circuit for modifying the multi-level grey signal by a predetermined value according to its grey level. The modified multi-level grey signal is binarized to a binary pixel signal according to a relationship between the modified multi-level grey signal and a threshold value. The process further generates an error corresponding to the relationship and diffuses the error to neighboring pixels. The multi-level grey signal is modified with either random noise multiplied by a grey level dependent coefficient or by a predetermined value from a checkerboard or vertical line pattern. The value from the pattern is dependent upon the grey level and pixel location of the image data.
    Type: Grant
    Filed: June 6, 1996
    Date of Patent: September 15, 1998
    Assignee: Xerox Corporation
    Inventors: David J. Metcalfe, Jeng-Nan Shiau, Leon C. Williams
  • Patent number: 5809369
    Abstract: An image processing system integral with an image output unit having a power saving mode comprises a temperature detection section for monitoring a fuser temperature in a power saving mode or a rotation detector for a polygonal motor, a control section for outputting a control signal at a predetermined timing, and an energization control section capable of turning on/off output in response to the control signal from the control section. The timing of a power saving mode off signal output by the control section is when the fuser temperature lowers to a temperature or the polygonal motor take longer to ramp up than the time until the image output unit, after the power saving mode is released, is placed in a reprintable state becomes longer than the time required for setting up the data required when image processing is performed. Thus, the transition time to the copyable state as a whole is used efficiently, and power consumption can be reduced.
    Type: Grant
    Filed: October 28, 1996
    Date of Patent: September 15, 1998
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Takeshi Furuya, Katsuyuki Kouno, Mitsuo Shimizu, Seiji Honda, Kouichi Azuma, Izumi Takahashi, Masahiko Miyata, Atsumi Kurita, Jun Kamei, Kenji Suzuki, Nobuyuki Kodera, Fumiya Shiseki
  • Patent number: 5809382
    Abstract: A method for and apparatus for creating partial gamut color images in a single pass. A plurality of latent discharged area images are formed using a single exposure. A first discharged area image is developed followed by recharging of the photoreceptor containing the images. The images are then subjected to a partial erase step followed by the development of a second discharged area image. All images formed subsequent to the first discharged image except for the last image are preceded by recharging and partial erase to thereby optimize development and cleaning fields.
    Type: Grant
    Filed: October 2, 1996
    Date of Patent: September 15, 1998
    Assignee: Xerox Corporation
    Inventors: Peter J. McGuire, Thomas M. Baretsky
  • Patent number: 5809377
    Abstract: An electrostatographic process cartridge detachably mountable into a cavity defined by mated modules forming parts of an electrostatographic reproduction machine having a copy-volume capacity limited by a waste toner sump capacity. The process cartridge includes an elongate housing having walls defining a process chamber; and a rotatable endless photoreceptive member mounted within the process chamber and to the housing. The photoreceptive member has an image bearing surface for holding a formed toner image, a conductive layer, and a closed loop path within the process chamber. The process cartridge also includes a high voltage electrostatographic charging device mounted to the elongate frame and along the closed loop path for applying a layer of electrostatic charge to the image bearing surface of the photoreceptive member; means for forming on, and transferring from, the image bearing surface, a toner image; and means for transferring the formed toner image onto a substrate.
    Type: Grant
    Filed: November 14, 1997
    Date of Patent: September 15, 1998
    Assignee: Xerox Corporation
    Inventors: Daniel A. Chiesa, Dhirendra C. Damji, Ajay Kumar
  • Patent number: 5808914
    Abstract: A table allocating apparatus for producing a layout of a table. In the apparatus, both of a linear equation for representing a column width of a table or a row height thereof by employing a parameter, and a section constraint condition corresponding to a combination of conditions for satisfying the parameter in order that a height or a width of a rectangle becomes constant when each of texts arranged in a table item column is allocated are set, then a layout evaluation formula expressed by the linear equation with employment of the parameter and indicative of better states of a layout for each of the section constraint conditions is calculated.
    Type: Grant
    Filed: April 7, 1995
    Date of Patent: September 15, 1998
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Kil-Ho Shin, Kenichi Kobayashi, Akira Suzuki
  • Patent number: 5809376
    Abstract: An electrostatographic process cartridge detachably mountable into a cavity defined by mated modules forming parts of an electrostatographic reproduction machine having a copy-volume capacity limited by a waste toner sump capacity. The process cartridge includes an elongate housing having walls defining a process chamber; and a rotatable endless photoreceptive member mounted within the process chamber and to the housing. The photoreceptive member has an image bearing surface for holding a formed toner image, a conductive layer, and a closed loop path within the process chamber. The process cartridge also includes a high voltage electrostatographic charging device mounted to the elongate frame and along the closed loop path for applying a layer of electrostatic charge to the image bearing surface of the photoreceptive member; mechanisms for forming on, and transferring from, the image bearing surface, a toner image; and mechanisms for transferring the formed toner image onto a substrate.
    Type: Grant
    Filed: November 14, 1997
    Date of Patent: September 15, 1998
    Assignee: Xerox Corporation
    Inventors: Daniel A. Chiesa, Dhirendra C. Damji, Ajay Kumar
  • Patent number: 5809267
    Abstract: A graphical editing system is provided which allows a user to draw number of commonly used gestures called primitive command gestures together in essentially one stroke. The primitive gestures are chosen to represent gestural syntax, analogous to a textual command syntax. The primitive gestures are concatenated. i.e., connected in a series of commands by a gestural operator called a break feature. Every input composite gesture is scanned to detect the break features. When found, the composite gesture is broken up into primitive gestures and each gesture is interpreted and executed in the order in which the individual gestures were drawn. The preferred break feature is sharp angle drawn between consecutive primitive gestures. In a composite gesture consisting of two primitive gestures, one being the selection gesture, the break feature is recognized as any departure from the selection gesture.
    Type: Grant
    Filed: March 18, 1996
    Date of Patent: September 15, 1998
    Assignee: Xerox Corporation
    Inventors: Thomas P. Moran, Patrick Chiu
  • Patent number: 5809385
    Abstract: An acoustic scavengeless assist (ASA) development apparatus, and a multicolor image reproduction machine including such a development apparatus. The (ASA) development apparatus includes a biased vibratory section having a piezoelectric member and a donor member, as well as, a development electrode section, for presenting toner particles to latent electrostatic images for image development. The donor member is positioned within the reproduction machine and forms a development nip with a latent image bearing surface of a photoreceptor of the reproduction machine. Importantly, the biased vibratory section has at least a first conductive electrode formed therein adjacent to the piezoelectric member for effecting controlled vibratory toner release from the donor member, and a first bias for biasing the at least first conductive electrode.
    Type: Grant
    Filed: June 30, 1997
    Date of Patent: September 15, 1998
    Assignee: Xerox Corporation
    Inventors: Christopher Snelling, Dan A. Hays, Jeffrey J. Folkins, Dale R. Mashtare
  • Patent number: 5809179
    Abstract: The invention automatically produces a rendered image version of an original image that accurately represents perceptually distinguishable objects, surfaces and edges in the original image. The original image is first converted to a unique data structure representation called an image structure map (ISM) that accurately, compactly and explicitly represents the geometry, topology and signal properties of perceptually distinguishable regions in the original image. The ISM is a dynamic partition of the image induced by a set of image region boundaries, and includes, for each region in the original image, a region data item that indicates the region boundary data items that form the region and a signal property descriptor indicating the value of signals computed for image locations in the region. An automatic segmentation operation determines image region boundaries occurring in the original image by analyzing discontinuities in signal values of original image locations.
    Type: Grant
    Filed: May 31, 1996
    Date of Patent: September 15, 1998
    Assignee: Xerox Corporation
    Inventors: David H. Marimont, Leonidas John Guibas
  • Patent number: 5809052
    Abstract: A semiconductor laser array driving method for driving a semiconductor laser array having a plurality of light-emitting points arranged on a base member. The semiconductor laser array driving method has a step of driving the plurality of light-emitting points by a driving pulse current of a pulse width and a duty factor meeting an inequality: .DELTA.T.sub.1 /.DELTA.T.sub.0 <1/2, where .DELTA.T.sub.0 is a temperature rise in active layers of the light-emitting points when the semiconductor laser array is driven in a continuous drive mode using a continuous current, and .DELTA.T.sub.1 is a temperature rise in the active layers of the light-emitting points when the semiconductor laser array is driven in a pulse drive mode using a pulse current. In the semiconductor laser array driving method, the plurality of light-emitting points are driven by a driving pulse current having a duty factor of 0.4 or below meeting an inequality: y<3.1 exp(-8.9x), where x is a duty factor and y is a pulse width (.mu.s).
    Type: Grant
    Filed: October 18, 1996
    Date of Patent: September 15, 1998
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Yasuji Seko, Akemi Murakami, Hiromi Otoma, Nobuaki Ueki, Hideki Fukunaga, Hideo Nakayama, Mario Fuse
  • Patent number: 5808459
    Abstract: There is disclosed a converter for converting a floating voltage of a Band Gap Reference voltage generator fabricated in P-substrate CMOS technology to a fixed voltage with respect to ground. The converter of this invention utilizes a subtractor to convert the floating voltage to a fixed reference voltage. In addition, the converter of this invention utilizes two level shifters which are able to level shift the floating voltage down and level shift the shifted down voltage substantially back to the level of the floating voltage in order to allow a buffer to be used prior to the subtractor.
    Type: Grant
    Filed: October 30, 1997
    Date of Patent: September 15, 1998
    Assignee: Xerox Corporation
    Inventors: Mostafa R. Yazdy, Harry J. McIntyre
  • Patent number: 5808676
    Abstract: Image transduction device pixel cells are described which have analog memory integrated with the pixel transduction elements and arrays made from such pixel cells. The integrated pixel cells are capable of storing information which, for example, can achieve a desired transduction transfer function for a given pixel transduction element. While the present invention may be used with any type of continuously variable, settable, and nonvolatile analog memory, the analog memory is beneficially based on a ferroelectric gate transistor comprised of an amorphous silicon transistor integrated with a ferroelectric gate dielectric layer or an amorphous silicon transistor with a charge storage dielectric gate layer.
    Type: Grant
    Filed: January 3, 1995
    Date of Patent: September 15, 1998
    Assignee: Xerox Corporation
    Inventors: David K. Biegelsen, Warren B. Jackson, Robert A. Street
  • Patent number: 5807631
    Abstract: A NFFR is disclosed which enables a NFFR fuser designed for one operating speed to be operated at a substantially greater speed while maintaining good wear and image gloss characteristics. A heated fuser roll member has a relatively thin outer layer which exhibits good wear and image gloss characteristics. The heated fuser roll member further includes an under layer contacting the outer layer which under layer is made thermally conductive. A third, thermally conductive layer is adhered to a conductive core and supports the under layer. The NFFR constructed according to the forgoing allows operation at a reduced set point temperature of 30.degree. to 40.degree. F. or in the alternative allowing for operation at a higher throughput speed at the higher set point temperature in lieu of operating at the lower set point temperature.
    Type: Grant
    Filed: June 30, 1997
    Date of Patent: September 15, 1998
    Assignee: Xerox Corporation
    Inventor: Rabin Moser
  • Patent number: 5808636
    Abstract: A method of ejecting a droplet of a fluid from a surface of the fluid includes the step of generating an acoustic wave to eject the droplet from the fluid surface. The acoustic wave is shaped into an optimal toneburst such that the droplet is ejected substantially in a direction of acoustic wave propagation substantially independent of an orientation of the fluid surface.
    Type: Grant
    Filed: September 13, 1996
    Date of Patent: September 15, 1998
    Assignee: Xerox Corporation
    Inventor: Richard G. Stearns
  • Patent number: 5807506
    Abstract: A process for the preparation of conductive polymers which comprises (a) mixing at least one monomer with at least one conductive component, solvent, at least one polymerization initiator, and an optional chain transfer component; (b) effecting solution polymerization by heating; (c) removing said solvent by azeotropic distillation in an aqueous phase to generate a mixture of polymer and conductive component; (d) drying and grinding the resulting mixture; thereafter dissolving the product resulting in at least one monomer, at least one initiator, and at least one crosslinking component, and an optional chain transfer agent to form an organic phase; (e) mixing said organic phase with a second aqueous phase comprised of water, stabilizer, and an alkali halide; (f) polymerizing the resulting suspension by heating; and (g) subsequently optionally washing and drying the polymeric product, and which product is comprised of polymer and conductive component dispersed therein.
    Type: Grant
    Filed: April 1, 1997
    Date of Patent: September 15, 1998
    Assignee: Xerox Corporation
    Inventors: Michael F. Cunningham, George Liebermann, Hadi K. Mahabadi, Daniel M. McNeil, Michael S. Hawkins, Thomas E. Enright, Aron J. Cogswell
  • Patent number: 5807652
    Abstract: A process for producing eight distinct colors, (viz. K, C, M, Y, CM, CY, MY and W) in a single pass with a single exposure in a 3.lambda./3L imaging system is provided. The use of xerocolography with a fifth developer housing containing the same color toner as one of the four normally used developer housings and suitable flood exposure devices overcomes the limitations of prior art K+6 imaging systems which utilize an exposure device capable of emitting light beams at three different wavelengths and a photoreceptor having three layers responsive to the three wavelengths.
    Type: Grant
    Filed: August 20, 1997
    Date of Patent: September 15, 1998
    Assignee: Xerox Corporation
    Inventor: Gregory J. Kovacs
  • Patent number: 5806843
    Abstract: The sheets in each tray of a multi tray sheet feeder are of the same thickness, but the sheets in one tray may be of a different thickness than the sheets in another tray. The sheets are fed from each sheet feeder tray to an intermediate stacker and then to a printer. A first sensor is provided just prior to entry of a sheet into the intermediate stacker and a second sensor is provided to sense a sheet as it is fed from the intermediate stacker. If the paper weight of sheets of paper on a tray fall within a first range of paper weight values, each sensor is designed to have a first given voltage response condition when sensing those sheets and if the paper weight of the sheets falls within a second range of paper weight values each sensor is designed to have a second given voltage response condition sensing the latter sheets.
    Type: Grant
    Filed: January 13, 1997
    Date of Patent: September 15, 1998
    Assignee: Xerox Corporation
    Inventors: Paul Hansen, Sheldon F. Raizes
  • Patent number: 5808297
    Abstract: Semiconductor chips for use in a chip array assembly for scanning of hard-copy images include rows of photosensors, each row of photosensors having a polyimide filter layer for passing one primary color. In addition to the photosensors, a reflective area is provided on the chip, with filter portions provided on the reflective area. The filter portions are created at the same time as the filter layers placed on the photosensors. The filter layers disposed on the reflective area can be used as test sites for determining the light transmissivity of the filter layers on the photosensors.
    Type: Grant
    Filed: July 22, 1996
    Date of Patent: September 15, 1998
    Assignee: Xerox Corporation
    Inventors: Josef E. Jedlicka, Brian T. Ormond
  • Patent number: 5809375
    Abstract: A xerographic CRU (Customer Relpaceable Unit) for an electrophotographic printing machine. The xerographic CRU has retaining features and cooperates with a drive module with certain retractable features that allow the insertion and removal of the CRU without causing damage to the photoreceptor and other critical subsystems. The unit further has many locating members for other subsystems so that critical tolerances are maintained. An interface with a single handle assembly retracts/unlocks and extends/locks the drive module and the associated CRU subsystems into an operative position. The CRU also has electrical and drive connections for the cleaning system, the charging system and transfer/detack.
    Type: Grant
    Filed: April 11, 1997
    Date of Patent: September 15, 1998
    Assignee: Xerox Corporation
    Inventors: Alvin J. Owens, Jr., David E. Rollins, Douglas W. Sass, Robert S. Pozniakas, Robert A. Gross, Fredrick M. Hausner, Daniel H. Burnett, Michael E. Beard, Ahmed-Mohsen T. Shehata, John A. Wargo, James L. Giacobbi, Richard M. Baran, David J. Lemmon
  • Patent number: 5807472
    Abstract: A method of separating an electroformed metal substrate from a mandrel includes establishing a parting gap between the electroformed metal substrate and the mandrel, attaching the electroformed metal substrate at a parabolic end of the mandrel to a parting fixture, and introducing a fluid through the parting fixture into an opening of the mandrel to effect separation of the electroformed metal substrate from the mandrel. The parting fixture includes a parabolically shaped outer cup with a fluid inlet tube extending through the bottom thereof. The parting fixture also preferably includes an inner cup for containing the fluid introduced through the fluid inlet tube and a vacuum device to effect attachment of the electroformed metal substrate to the parting fixture.
    Type: Grant
    Filed: January 13, 1997
    Date of Patent: September 15, 1998
    Assignee: Xerox Corporation
    Inventors: Loren E. Hendrix, William G. Herbert, Gary J. Maier, Ernest F. Matyi