Patents Examined by David Yockey
  • Patent number: 5748215
    Abstract: An ink-jet print cartridge is formed by a rigid outer protective case and an inner ink reservoir having a flexible wall portion and a rigid wall portion which together form a sealed compartment. The flexible wall portion includes two opposing membranes sealed at their periphery to an inner loop-like frame which is integrated with a portion of the outer case. The outer protective case also covers a snout having a shortened length in the media advance direction to allow media positioning rollers closely adjacent to the print zone. The snout includes internal filters in an ink passageway from the reservoir to print nozzles at the end of the snout.
    Type: Grant
    Filed: June 28, 1995
    Date of Patent: May 5, 1998
    Assignee: Hewlett-Packard Company
    Inventors: David W. Swanson, George T. Kaplinsky, James G. Salter, W. Wistar Rhoads
  • Patent number: 5691750
    Abstract: A printer having a disposable print head which contains a consumable ink supply includes the capability of determining the level of ink in the print head without directly measuring the ink supply. The print head includes a number of resistors which can be driven to an open circuit condition by the printer. The printer includes a counter and memory for tracking the usage of the print head and a driver for selectively driving the print head resistors to an open circuit condition based upon such usage. The printer is also capable of detecting the condition of the resistors on the print head and producing a resultant visual display.
    Type: Grant
    Filed: November 24, 1992
    Date of Patent: November 25, 1997
    Assignee: Lexmark International, Inc.
    Inventor: Mark Joseph Edwards
  • Patent number: 5689295
    Abstract: A printing method is performed with an ink jet print head including a matrix of groups of orifices positioned in parallel rows. Each group has a plurality of orifices which each eject fluid of a different color. The color fluid, e.g. ink, is simultaneously propelled through the orifices of each group selected for printing and onto an information carrier which is stationary in relation to the matrix. The print head has a multilaminate structure with additional layers (20-25) of an underlay (10) equal to the number of print colors. The orifices (BK, Y, R, B) are divided into groups of adjoining orifices with the same number of orifices in each group and with the orifices in each group disposed in a square arrangement. The inlet openings of all orifices which eject fluid of the same color are placed in a single additional layer of the underlay. Feeder channels (26-29) are made in each additional layer of the underlay and cross the orifice openings (11-14) in that layer.
    Type: Grant
    Filed: April 13, 1992
    Date of Patent: November 18, 1997
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Jury Grigorievich Eremin, Sergei Nikolaevich Maximovsky, Grigory Avramovich Radutsky
  • Patent number: 5686944
    Abstract: In an ink jet printer, a print head includes (N+1) nozzles arrayed in the paper feed direction. The distance between the adjacent nozzles is K times as long as the dot line pitch P. N and K are each an integer larger than 2, and mutually prime. The quantity of ink droplet discharged from each nozzle is adjusted so as to form on a print paper, dots each having the diameter at least 1.4 times as long as the dot line pitch. An interlaced print as the combination of a print of paths made by the N successive upper nozzles of the print head and a paper feed of N print line pitches is used for the print on the most part of the print paper. A minute-feed print as the combination of a print of paths made by the N successive upper or lower nozzles of the print head and a paper feed of one print line pitch is used for the print on the upper and lower end areas of the print paper that reject a perfect print by the interlaced print.
    Type: Grant
    Filed: February 28, 1995
    Date of Patent: November 11, 1997
    Assignee: Seiko Epson Corporation
    Inventors: Akira Takagi, Hiroaki Tojo, Shoichi Hiraide
  • Patent number: 5657070
    Abstract: A circuit for driving an LED print head so as to be capable of printing a variety of gray levels, comprises a print controller for generating synchronizing signals and latch clock pulses to be applied to the LED print head, a video clock signal generator means for generating a predetermined number of video clock pulses in response to the sub-synchronizing signals, a video data generating means operated by the sub-synchronizing signals for generating a number of sub-data representing the contrast of one line data in response to the video clock pulses, a contrast mode decoding means for counting the latch clock pulses in one period of the sub-synchronizing signals to generate first, second, third and fourth enable signals, a contrast strobe pulse generating means for generating first, second and third strobe pulses of different periods in response to the first enable signal, and a drive circuit for logically combining the second, third and fourth signals and the first, second and third strobe pulses so as to dr
    Type: Grant
    Filed: February 25, 1993
    Date of Patent: August 12, 1997
    Assignee: SamSung Electronics Co., Ltd.
    Inventor: Byung-Deok Nam
  • Patent number: 5657069
    Abstract: A method and apparatus for grey level printing includes a plurality of recording elements which are enabled for variable periods of time during a cycle of recording grey level pixels. For each recording element a comparator compares the count in a time-changing exposure counter with a multibit grey level data signal. The exposure counter is decremented/incremented by exposure clock pulses from a programmable exposure clock. The exposure clock includes a master clock and an address counter that provides an incremented address signal in response to each set of N pulses from the master clock. The address signal identifies a location in memory of a set of signals used to generate exposure clock pulses. The set of signals is output in parallel to a serial shift register and shifted out serially to form the exposure clock pulses for decrementing/incrementing the exposure counter.
    Type: Grant
    Filed: December 13, 1991
    Date of Patent: August 12, 1997
    Assignee: Eastman Kodak Company
    Inventors: E. Michael Kelly, James R. Prowak
  • Patent number: 5650802
    Abstract: Inkjet printer using opposing walls made of piezoelectric material which oscillate during a print mode at a level sufficient to eject droplets of a disperse-system ink contained in an ink chamber through a nozzle and during a redispersion mode at a level sufficient to disperse cohered and sedimented pigment particles into a substantially homogeneous condition throughout the dispersion medium of the disperse-system ink in the ink chamber, but insufficient for ejecting the ink through the nozzle.
    Type: Grant
    Filed: March 31, 1995
    Date of Patent: July 22, 1997
    Assignee: Brother Kogyo Kabushiki Kaisha
    Inventors: Masahiko Suzuki, Yoshikazu Takahashi, Hiroto Sugahara, Takahiro Kanegae, Masayoshi Kinoshita, Manabu Yoshimura
  • Patent number: 5648810
    Abstract: Bit data of a received video signal is partially converted into a first signal representing a data sequence corresponding to the resolution of an LED head. The first signal is transmitted to the LED head in the form of a real printing data signal that is to be printed on a basic raster line in synchronism with a line timing signal. The remaining bit data of the received video signal, which are not converted into the first signal, are converted into a second signal representing another data sequence, and then stored in a line buffer. The second signal stored in the line buffer is transmitted to the LED head in the form of a real printing data signal that is to be printed on an additional raster line in synchronism with an additional line timing signal. The LED head drive energy with which the basic raster lines are printed and another LED head drive energy with which the additional raster lines are printed are set independently of each other.
    Type: Grant
    Filed: July 2, 1992
    Date of Patent: July 15, 1997
    Assignee: Oki Electric Industry Co., Ltd.
    Inventors: Jiro Tanuma, Katsuyuki Ito, Shinichi Katakura, Nobuo Wakasugi, Kazuhiko Nagaoka, Toshikaru Ito
  • Patent number: 5646674
    Abstract: A laser print head structure includes a laser diode array (14) coupled to a heat sink (10). A cylindrical lens element (20) is aligned with the laser diode array and bonded to the heat sink. A binary optical element (22) is then aligned with the cylindrical lens element and attached to the heat sink through the use of flexures (24). The use of the flexures permits the binary optical element to "float" in the plane of the laser diode array, thereby maintaining alignment even when the thermal expansion characteristics of the binary optical element are different from the thermal expansion characteristics of the heat sink. Anti-wicking slots (18) are provided in the heat sink at locations between the bonding points of the cylindrical lens element and the laser diode array. The anti-wicking slots, through capillary action, prevent excess adhesive from wicking along the cylindrical lens element and onto the facets of the lasers in the laser diode array.
    Type: Grant
    Filed: April 29, 1994
    Date of Patent: July 8, 1997
    Assignee: Eastman Kodak Company
    Inventors: Wesley H. Bacon, Kenneth L. Baker, John R. Debesis, Jeffrey P. Serbicki, James S. Newkirk
  • Patent number: 5644347
    Abstract: A service station for use with an inkjet printer is described. The service station includes a sled that is mounted to the printer's chassis. Caps and wipers can be mounted on the sled for each of the printer's movable carriage-mounted printheads. The sled and the chassis, and the sled and carriage, are each cam-coupled so that movement of the carriage produces slight vertical and lateral movement of the sled out of a nominal position to automatically place the sled in one of three primary positions relative to the carriage: an elevated position for capping the printheads, an intermediate position for wiping the printheads and a lowered position for free reciprocal movement of the carriage without interference between the printheads and either the caps or the wipers. According to the invention, wipers are biased against corresponding print cartridges such that the wipers that wipe the printhead of a print cartridge dispensing pigmented ink are biased against the printhead in a different manner, e.g.
    Type: Grant
    Filed: April 8, 1994
    Date of Patent: July 1, 1997
    Assignee: Hewlett-Packard Company
    Inventors: William H. Schwiebert, Gerold G. Firl, Heinz H. Waschhauser, William S. Osborne
  • Patent number: 5642149
    Abstract: A printing apparatus includes an imaging system which focuses a plurality of different color LED sources on a photosensitive recording medium without use of any refractive optics. The imaging system comprises two concave mirrors having reflective surfaces, each of which is a conic section, and a baffle located between the mirrors. Each of the mirrors includes an aperture and the baffle is located between the apertures of the mirrors. A printing method utilizing the apparatus includes reflection of light generated by the LED sources between the mirrors following a series of zigzag turns, convergence of the light through an aperture in one of the mirrors, and formation of an image on a photosensitive recording medium without passing through refracting optics, wherein the baffle blocks light from propagating directly towards an imaging surface without reflecting in the imaging system.
    Type: Grant
    Filed: September 20, 1993
    Date of Patent: June 24, 1997
    Assignee: Eastman Kodak Company
    Inventor: Russell Jay Palum
  • Patent number: 5640188
    Abstract: The present invention is a multiple spot laser assembly, comprising a plurality of laser diodes, and a plurality of mounts, which include a support surface, upon which the laser diode are permanently affixed. The mounts, including the base plate and/or heat sink, further include a mating feature along an edge thereof for aligning a first mount with an adjacent mount, the two mounts abutting along at least one common edge. The mating features assure the accurate alignment of the laser diodes on the adjacent mounts when the mounts are assembled into a multispot laser light source.
    Type: Grant
    Filed: December 18, 1992
    Date of Patent: June 17, 1997
    Assignee: Xerox Corporation
    Inventor: John R. Andrews
  • Patent number: 5638108
    Abstract: A method for achieving high resolution printing using low resolution LED bars is performed by arranging the bars at particular angles to the photoreceptor and timing the activation of the pixels within the LED bars according to the movement of the photoreceptor. In addition, the LED bars may be segmented and arranged so that the segments abut one another at different locations. Each of the abutting segments is disposed at a particular angle to the photoreceptor in the process direction. A lens arrangement is used to image the LED bars.
    Type: Grant
    Filed: August 31, 1994
    Date of Patent: June 10, 1997
    Assignee: Xerox Corporation
    Inventors: Aron Nacman, James J. Appel, George A. Charnitski
  • Patent number: 5633662
    Abstract: A process is disclosed for controlling ink volume in liquid ink printing systems such as ink jet printers. The process examines the total ink volume per pixel as specified in source image data (typically 24-bit, three color data), i.e. before digital halftoning. For each pixel of data, the specified ink volume is compared to a selected maximum total ink volume per pixel. The maximum total ink volume is selected, depending upon the printing medium and environmental conditions, so as to provide good color coverage while avoiding curl, bleeding and other adverse effects of excessive ink volume. The source image ink volume is reduced so as to form depleted image data in which the ink volumes per pixel do not exceed the selected maximum. Preferably, a threshold ink volume also is selected, below which no ink limiting is applied, thereby avoiding washed-out images at lower ink volumes. Above the threshold, the ink volume is scaled to a value below the maximum, preferably by linear scaling.
    Type: Grant
    Filed: August 5, 1992
    Date of Patent: May 27, 1997
    Assignee: Hewlett-Packard Company
    Inventors: William J. Allen, Steven O. Miller
  • Patent number: 5625402
    Abstract: Laser color printers include multiple laser sources formed of either diode lasers or laser diode arrays emitting light beams of different wavelengths, and an optical arrangement. The optical arrangement independently processes each of the light beams to provide a separate predetermined sized collimated light beam, and then focuses and scans the light beams over a printing media that prints separate colors for each different wavelength of light. Where different sized collimated light beams are required to match a printing media, a separate zoom lens is used is used in the optical arrangement to independently reshape each of two orthogonal cross-sectional directions of a separate one of the light beams before being properly sized at the output thereof.
    Type: Grant
    Filed: April 30, 1993
    Date of Patent: April 29, 1997
    Assignee: Eastman Kodak Company
    Inventor: Sanwal P. Sarraf
  • Patent number: 5625389
    Abstract: Improved color ink-jet printing is accomplished by an ink-jet nozzle array configuration (32, 110) which has an odd number of nozzles (34) that are uniformly spaced apart by two line widths (2 V) such that naturally interlaced printing is accomplished when a print head (54) employing the nozzle array configuration is moved in uniformly stepped intervals. A color ink-jet print head employing the array configuration further employs multiple horizontally spaced apart instances (30) of the array in which each array ejects a particular color of ink, and the nozzles of each array are aligned in the direction of scanning to eject ink toward a common band of lines.
    Type: Grant
    Filed: January 31, 1994
    Date of Patent: April 29, 1997
    Assignee: Tektronix, Inc.
    Inventors: Joern B. Eriksen, Michael D. Stevens, Howard V. Goetz
  • Patent number: 5625384
    Abstract: Replacement of a recording head on a recording apparatus is detected on the basis of a serial number allocated to each recording head. The recording head also carries head characteristic information such as color information, shading information and so forth. When the recording head is replaced with a new one, the head characteristic information of the newly mounted recording head is automatically stored, so that head driving conditions are automatically determined to optimize the recording conditions without requiring any manual adjustment. Recovery operation is automatically executed when replacement of the recording head is detected, so that required recording conditions are recovered without manual instructions.
    Type: Grant
    Filed: January 17, 1992
    Date of Patent: April 29, 1997
    Assignee: Canon Kabushiki Kaisha
    Inventors: Yasuhiro Numata, Kazuyoshi Takahashi, Yoshiaki Takayanagi, Hiroshi Tajika, Noribumi Koitabashi, Hitoshi Sugimoto, Souhei Tanaka
  • Patent number: 5623300
    Abstract: A print head for reproducing a multi-level image is an provided. In the print head, a light-emitting array comprises a linear line of light-emitting elements. A D/A converter converts a multi-level image data to an analog signal, and an analog shift register shifts and latches the analog signals of a line received from the D/A converter. An analog latch register latches the analog signals held by the analog shift register. A driver controls the quantity of light of the light-emitting elements according to the analog signals latched by the analog latch register. In one embodiment, the print head includes a second analog shift register, an A/D converter a line memory and a divider which divides the image data by a signal from the line memory to produce corrected data which is provided to the driver to control driving of the light-emitting elements.
    Type: Grant
    Filed: August 2, 1993
    Date of Patent: April 22, 1997
    Assignee: Minolta Camera Kabushiki Kaisha
    Inventors: Tetsuya Itoh, Munehiro Nakatani, Nobuo Kamei
  • Patent number: 5621441
    Abstract: Wiping and capping method and apparatus for use with an inkjet printer are described. The apparatus includes a sled that is mounted to a printer's chassis. Caps and wipers can be mounted on the sled for each of the printer's movable carriage-mounted printheads. The sled and the chassis are cam-coupled for controlled, relative movement therebetween. The sled and the carriage are also cam-coupled for controlled, relative movement therebetween. Movement of the carriage produces slight vertical and lateral movement of the sled out of its nominal position to place it in three primary positions relative to the carriage: an elevated position for capping the printheads, an intermediate position for wiping the printheads and a lowered position for free reciprocal movement of the carriage without interference between the printheads and either the caps or the wipers. The sled is mounted to ensure constant capping force between the caps and their corresponding printheads.
    Type: Grant
    Filed: April 30, 1993
    Date of Patent: April 15, 1997
    Assignee: Hewlett-Packard Company
    Inventors: Heinz H. Waschhauser, William S. Osborne
  • Patent number: 5619242
    Abstract: An image forming apparatus for forming an image on an image forming body by scanning a plurality of modulated laser beams is disclosed. The apparatus is provided with a generator to generate a plurality of reference signals each with a differrent phase from other reference signals, a detector for detecting the difference of image density between two adjacent image pixels, combined modulator to generate a modulated laser beam by combining a selected laser beam, a selected reference signal and the image density. The detector classifies each pixel as one of an edge starting pixel, an edge ending pixel, and a non-edge pixel based on the value of image density difference relative to positive and negative threshold values. The selection of the laser beam and the reference signal is based on the image density difference detected by the detector and the class of the pixel.
    Type: Grant
    Filed: January 11, 1994
    Date of Patent: April 8, 1997
    Assignee: Konica Corporation
    Inventors: Satoshi Haneda, Masakazu Fukuchi, Tadashi Miwa