Patents by Inventor Keiichiroh Hirahara

Keiichiroh Hirahara 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: 7959300
    Abstract: A projection image display device including a display plane for displaying an image, a projection mechanism projecting an image on the display plane, and an imaging mechanism arranged on the same side of the display plane as the projection mechanism for imaging the display plane. The imaging mechanism is arranged at a position where a position symmetric with respect to the display plane of the projection mechanism is out of the range of the field angle of the imaging mechanism. By arranging the imaging mechanism at a position where no direct reflecting light of the light source of the projection mechanism comes, it is possible to prevent generation of a hot spot.
    Type: Grant
    Filed: June 29, 2006
    Date of Patent: June 14, 2011
    Assignee: Ricoh Company, Ltd.
    Inventors: Keiichiroh Hirahara, Akira Sakurai
  • Publication number: 20090207383
    Abstract: There is provided a projected image display unit characterized by a display surface configured to display an image; projection means for projecting the image onto the display surface; and image capturing means for performing image capturing on the display surface, the image capturing means being placed on the same side of the display surface as the projection means, wherein the image capturing means is placed at a position so that the symmetrical position of the projection means with respect to the display surface is out of the range of the angle of view of the image capturing means.
    Type: Application
    Filed: June 29, 2006
    Publication date: August 20, 2009
    Inventors: Keiichiroh Hirahara, Akira Sakurai
  • Patent number: 7483056
    Abstract: An image capturing apparatus in which an image of a subject formed by lenses and a low pass filter of a photographic optical system is provided to an imaging device unit that supplies a corresponding signal to an A/D converter that in turn provides an output to an image processing unit. A blur-detecting device with a blur detecting part and a blur detecting unit detect blur that is compensated by a blur compensating unit with a blur-compensation driving unit. A system controller computes a displacement amount for blur compensation by the blur-compensation driving unit driving the blur compensating unit based on an output of the blur detecting device. A memory group is included for calibrating a conversion coefficient used by the system controller in calculating the displacement amount.
    Type: Grant
    Filed: August 15, 2003
    Date of Patent: January 27, 2009
    Assignee: Ricoh Company, Ltd.
    Inventors: Junichi Shinohara, Kunihisa Yamaguchi, Naoki Koshida, Keiichiroh Hirahara, Hiroyuki Chiba
  • Publication number: 20090015553
    Abstract: A disclosed image displaying apparatus comprises: a photographing unit configured to photograph an image on a screen; a projection image generating unit generating the image to be projected on the screen; an image extracting unit extracting identification information from the image photographed by the photographing unit, the identification information concerning object or figure information; an object recognizing unit recognizing attribute information from the identification information concerning the object information extracted by the image extracting unit; a figure recognizing unit recognizing characteristic information from the identification information concerning the figure information extracted by the image extracting unit; and an operation processing unit operating the projection image generating unit based on the attribute information and characteristic information.
    Type: Application
    Filed: May 31, 2006
    Publication date: January 15, 2009
    Inventors: Keiichiroh Hirahara, Akira Sakurai
  • Publication number: 20040100561
    Abstract: An image capturing apparatus or digital camera in which an image of a subject formed by lenses (L1 and L2), and a low pass filter (F), in a photographic optical system is inputted by an imaging device unit (IS), an A/D converter (11, 111 or 211) and an image processing unit (12, 112 or 212), in an imaging device, comprises the a blur detecting part (16) and a blur detecting unit (17) in a blur-detecting device (SD), a compensating unit (BU) and a blur-compensation driving unit (20, 120 or 220) in a blur compensating device, a blur-compensation controlling device or system controller (15) for computing a displaced amount for compensation in a blur compensating device from an output of the blur detecting device and driving the blur compensating device, a device or the system controller (15) and a memory group (19) for calibrating a conversion coefficient for converting the output of the blur detecting device into the displaced amount, and a device for executing a calibrating operation, or the system controller
    Type: Application
    Filed: August 15, 2003
    Publication date: May 27, 2004
    Inventors: Junichi Shinohara, Kunihisa Yamaguchi, Naoki Koshida, Keiichiroh Hirahara, Hiroyuki Chiba