Patents by Inventor Kazuyuki Murata

Kazuyuki Murata has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 5502575
    Abstract: An imaging apparatus comprising a counterfeiting prevention arrangement and reliably preventing counterfeit reproduction of currency, negotiable certificates, and other registered documents is provided by preventing modification or removal of the counterfeiting prevention arrangement. Modification or removal of the counterfeiting prevention arrangement is prevented in this imaging apparatus by integrating circuit elements or components of the counterfeiting prevention arrangement with circuit elements or components of the image processors of the imaging system in a single chip, or sealing these components in a single mold, effectively preventing modification or removal of the counterfeiting prevention arrangement without disabling the imaging system.
    Type: Grant
    Filed: July 29, 1993
    Date of Patent: March 26, 1996
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Tsutomu Kai, Kazuyuki Murata, Yasuhiro Kuwahara, Hitoshi Ono, Tsutomu Mikami, Tomoko Suetake, Akio Kojima
  • Patent number: 5477257
    Abstract: Image forming apparatus and method for forming half tone images by pulse width modulating multi-valued image signals comprises first and second pattern signal generators which generate pattern signals each having the same period and a phase shifted from each other, first and second pulse width modulators for pulse width modulating said image signals using the first and second pattern signals, respectively, a selector for selecting either of the first and second pulse width modulated signals and a controller for controlling the selector to obtain a screen angle of 45.degree..Further, image forming apparatus and method which realizes a screen angle .theta. wherein tan .theta. is represented by a rational number.
    Type: Grant
    Filed: November 10, 1992
    Date of Patent: December 19, 1995
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventor: Kazuyuki Murata
  • Patent number: 5477346
    Abstract: A digital color copying machine improves the quality of an image of black characters by reproducing them with only black toner and prevents the edges of each black character from being colored with a color. The machine includes a monochromatic signal generator for generating a monochromatic signal in response to inputted plural color signals and an edge emphasizer for emphasizing edge components of the color signals with a predetermined edge emphasis amount. Either a digitizer for digitizing the monochromatic signal and outputting a binary signal of the monochromatic signal or a pseudo digitizer for generating a pseudo binary signal by steepening the contrast of the monochromatic signal is provided. A first area detector, second area detector, and third area detector are respectively provided for detecting first through third image areas.
    Type: Grant
    Filed: November 2, 1994
    Date of Patent: December 19, 1995
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventor: Kazuyuki Murata
  • Patent number: 5450208
    Abstract: The image processing apparatus for smoothing edges in a reproduced image includes an image data generating circuit for generating image data including a specified pixel and a plurality of pixels surrounding the specified pixel; a sub-pixel data generating circuit for dividing the specified pixel included in the image data into N sub-pixels, for detecting the condition of the specified pixel and the condition of the plurality of pixels surrounding the specified pixel included in the image data by matching the image data with a plurality of predetermined patterns, and for generating sub-pixel data for determining the number and position of sub-pixels to be exposed of the N sub-pixels, based on the condition of the specified pixel and the condition of the plurality of pixels surrounding the specified pixel; and supplying circuit for supplying the sub-pixel data to exposure circuit which makes exposure.
    Type: Grant
    Filed: November 29, 1993
    Date of Patent: September 12, 1995
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventor: Kazuyuki Murata
  • Patent number: 5392139
    Abstract: An image processing apparatus performs an edge correction process for image signals of respective pixels sequentially inputted, each image signal having a density level corresponding to a pixel. An edge amount detector of the image processing apparatus calculates a difference between a density level of an image signal of a specified pixel from among the image signals and a product of a predetermined value and the sum of the density levels of peripheral pixels located at a predetermined distance from the specified pixel, and outputs a detection signal having a level of an edge amount of the calculated difference, and an edge amount convertor converts the edge amount of the detection signal into a converted edge amount in a predetermined manner, and outputs a conversion signal having level of the converted edge amount.
    Type: Grant
    Filed: May 24, 1994
    Date of Patent: February 21, 1995
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventor: Kazuyuki Murata
  • Patent number: 5365258
    Abstract: A color image forming apparatus with plural photoconductor drums has a plurality of color image forming arrangements, each arrangement includes an image signal processor for processing an image signal for one of black, cyan, magenta and yellow, and for producing a modulated image signal, a semiconductor laser diode for emitting laser beam in accordance with the modulated image signal, a scanning device for scanning the laser beams on a photoconductor surface. The laser beam passes through a slit or an elongated opening provided between the semiconductor laser diode and the photoconductor surface for reforming the laser beam to have a cross-section shape of an ellipse with its short axis parallel to the laser scanning direction.
    Type: Grant
    Filed: February 19, 1993
    Date of Patent: November 15, 1994
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Kazuyuki Murata, Takeshi Shimamoto
  • Patent number: 5311328
    Abstract: An image processing apparatus performs an edge correction process for image signals of respective pixels sequentially inputted, each image signal having a density level corresponding to a pixel. An edge amount detector of the image processing apparatus calculates a difference between a density level of an image signal of a specified pixel predetermined from among the image signals and a product of a predetermined value and the sum of the density levels of peripheral pixels located at a predetermined distance from the specified pixel, and outputs a detection signal having a level of an edge amount of the calculated difference, and an edge amount convertor converts the edge amount of the detection signal into a converted edge amount in a predetermined manner, and outputs a conversion signal having level of the converted edge amount.
    Type: Grant
    Filed: February 23, 1993
    Date of Patent: May 10, 1994
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventor: Kazuyuki Murata
  • Patent number: 5155202
    Abstract: A phenolic novolak resin comprising a compound represented by the general formula [I]: ##STR1## wherein X is H or ##STR2## R is an alkyl group having 1 to 4 carbon atoms, and n is 1 to 10, particularly a phenolic novolak epoxy resin, and material, and a cured substance therefrom, and a process for producing the resin are disclosed. This resin is excellent in heat resistance and in reluctance to absorb water as compared with conventional phenolic resins, and useful in sealing electronic parts, molding, and laminating.
    Type: Grant
    Filed: February 6, 1991
    Date of Patent: October 13, 1992
    Assignee: Nippon Kayaku Kabushiki Kaisha
    Inventors: Hiromi Morita, Kazuyuki Murata, Ichiro Kimura, Susumu Nagao
  • Patent number: 4977448
    Abstract: An image processing apparatus is for exactly reproducing color originals. The apparatus includes a circuit for removing a ground color contained in an input color signal by forcibly changing an input signal having a level larger than a predetermined level to white. The apparatus may include a gamma correction circuit having therein a plurality of selectable gamma collection data. The apparatus may also include a circuit for producing a natural monochromatic signal from signals corresponding to three primary color signals R, G and B by performing an operation expressed as [(signal corresponding to R).times.2.sup.I +(signal corresponding to G).times.2.sup.I +(signal corresponding to B).times.2.sup.K ]/2.sup.L wherein I, J, K and L are integers and 2.sup.I +2.sup.J +2.sup.K =2.sup.L.
    Type: Grant
    Filed: December 16, 1988
    Date of Patent: December 11, 1990
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Kazuyuki Murata, Kinya Kanno, Katsuhiro Kanamori
  • Patent number: 4862284
    Abstract: A copier comprises an original table for placing thereon an original sheet, a sub-scanning unit including an image reading sensor for reading an image on the original sheet and for scanning the original sheet on the original table, a printing unit which prints the image read by the image reading sensor on a printing sheet, and a control unit which controls the operation of the sub-scanning unit by selectively using a position profile control and a speed profile control. The operation start position and operation starting timing control of the sub-scanning unit using the position profile control permits high-speed continuous repetitive copying and high-accuracy enlargement, reduction, and transfer copying.
    Type: Grant
    Filed: September 11, 1987
    Date of Patent: August 29, 1989
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventor: Kazuyuki Murata