Patents by Inventor Katsuhiro Seo

Katsuhiro Seo 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: 5648944
    Abstract: A disc recording and/or reproducing apparatus including a signal recording/reproducing section for recording and/or reproducing information signals on a disc 64 mm in diameter housed in a cartridge main body to form a disc cartridge, a loading mechanism for loading or unloading the disc cartridge on or from the signal recording/reproducing section and a control circuit controlling the recording/reproducing operation of the recording/reproducing section. The disc has a signal recording part divided into plural signal recording zones of substantially equal line recording density across the inner and the outer peripheries of the disc. The signal recording/reproducing section, the loading mechanism and the control circuit are housed in a casing which is 70 mm or less in width, 100 mm or less in length and 24.5 mm or less in height and which is provided with a disc inserting opening. The apparatus may be reduced in size without decreasing the recording capacity.
    Type: Grant
    Filed: June 12, 1996
    Date of Patent: July 15, 1997
    Assignee: Sony Corporation
    Inventors: Kiyoshi Ohmori, Tetsu Watanabe, Katsuhiro Seo, Junichi Kudo
  • Patent number: 5627810
    Abstract: A disc recording and/or reproducing apparatus including a signal recording/reproducing section for recording and/or reproducing information signals on a disc 86 mm in diameter housed in a cartridge main body to form a disc cartridge, a loading mechanism for loading or unloading the disc cartridge on or from the signal recording/reproducing section and a control circuit controlling the recording/reproducing operation of the recording/reproducing section. The disc has a signal recording part divided into plural signal recording zones of substantially equal line recording density across the inner and the outer peripheries of the disc. The signal recording/reproducing section, the loading mechanism and the control circuit are housed in a casing which is 101.6 mm or less in width, 150 mm or less in length and 25.4 mm or less in height and which is provided with a disc inserting opening. The apparatus may be reduced in size without decreasing the recording capacity.
    Type: Grant
    Filed: June 12, 1996
    Date of Patent: May 6, 1997
    Assignee: Sony Corporation
    Inventors: Kiyoshi Ohmori, Tetsu Watanabe, Katsuhiro Seo, Junichi Kudo
  • Patent number: 5577018
    Abstract: In an optical pickup apparatus, including a laser source (11) arranged along an optical axis (0-0'), a polarization beam splitter (14) and an objective lens (13), wherein light emitted from the laser source (11) is emitted on a recording plane (1a) of an optical-magnetical recording media (1) as a converged beam, light beams reflected from the recording media (1a) of the optical-magnetical recording media (1) are separated by said polarization beam splitter (14) to obtain a predetermined polarized light component, a phase change means, which changes a phase of light passing through one side of said optical axis (0-0') and a phase of light passing through another side of said optical axis (0-0') by a predetermined angle, such as 1/2 wavelength plate (15), a phase retardation type prism (39) and a combination optical rotation plate (52), is provided between the polarization beam splitter (14) and the objective lens (13), and, an optical detection element, which detects the light polarized by the polarization be
    Type: Grant
    Filed: September 21, 1993
    Date of Patent: November 19, 1996
    Assignee: Sony Corporation
    Inventors: Hideyoshi Horimai, Katsuhiro Seo, Kimihiro Saito, Kiyoshi Toyota
  • Patent number: 5563869
    Abstract: In an optical pickup apparatus, including a laser source arranged along an optical axis, a polarization beam splitter and an objective lens, wherein light emitted from the laser source is emitted on a recording plane of an optical-magnetical recording media as a converged beam, light beams reflected from the recording media of the optical-magnetical recording media are separated by said polarization beam splitter to obtain a predetermined polarized light component, a phase change means, which changes a phase of light passing through one side of said optical axis and a phase of light passing through another side of said optical axis by a predetermined angle, such as wavelength plate, a phase retardation type prism and a combination optical rotation plate, is provided between the polarization beam splitter and the objective lens, and, an optical detection element, which detects the light polarized by the polarization beam splitter, is provided at a side intersecting the phase change means of the polarization be
    Type: Grant
    Filed: February 24, 1995
    Date of Patent: October 8, 1996
    Assignee: Sony Corporation
    Inventors: Hideyoshi Horimai, Katsuhiro Seo, Kimihiro Saito, Kiyoshi Toyota
  • Patent number: 5428583
    Abstract: A magneto-optical disc recording/reproducing apparatus in which a magneto-optical disc, a disc rotating and driving unit, an optical head device, an external magnetic field generating unit and a controlling device are contained as one in an outer casing.
    Type: Grant
    Filed: October 26, 1992
    Date of Patent: June 27, 1995
    Assignee: Sony Corporation
    Inventors: Kiyoshi Ohmori, Tetsu Watanabe, Katsuhiro Seo, Junichi Kudo
  • Patent number: 5416762
    Abstract: A disc recording and/or reproducing apparatus includes a holding device for holding a disc cartridge which is a cartridge main body and a disc housed in the cartridge main body, a rotating and driving device for rotationally driving the disc housed within the holding device, and a positioning device provided within the rotating and driving device for positioning the disc cartridge housed within the holding device. The recording disc may be positioned highly accurately within the disc cartridge in such a manner that resonant vibrations may be prevented from being produced on the chassis.
    Type: Grant
    Filed: April 16, 1992
    Date of Patent: May 16, 1995
    Assignee: Sony Corporation
    Inventors: Kiyoshi Ohmori, Katsuhiro Seo
  • Patent number: 5414687
    Abstract: A disc recording and/or reproducing apparatus including a signal recording/reproducing section for recording and/or reproducing information signals on a disc 86 mm in diameter housed in a cartridge main body to form a disc cartridge, a loading mechanism for loading or unloading the disc cartridge on or from the signal recording/reproducing section and a control circuit controlling the recording/reproducing operation of the recording/reproducing section. The disc has a signal recording part divided into plural signal recording zones of substantially equal line recording density ac ross the inner and the outer peripheries of the disc. The signal recording/reproducing section, the loading mechanism and the control circuit are housed in a casing which is 101.6 mm or less in width, 150 mm or less in length and 25.4 mm or less in height and which is provided with a disc inserting opening. The apparatus may be reduced in size without decreasing the recording capacity.
    Type: Grant
    Filed: November 10, 1993
    Date of Patent: May 9, 1995
    Assignee: Sony Corporation
    Inventors: Kiyoshi Ohmori, Tetsu Watanabe, Katsuhiro Seo, Junichi Kudo
  • Patent number: 5329503
    Abstract: A magneto-optical disc recording/reproducing apparatus in which a magneto-optical disc, a disc rotating and driving unit, an optical head device, an external magnetic field generating unit and a controlling device are contained as one in an outer casing.
    Type: Grant
    Filed: October 26, 1992
    Date of Patent: July 12, 1994
    Assignee: Sony Corporation
    Inventors: Kiyoshi Ohmori, Tetsu Watanabe, Katsuhiro Seo, Junichi Kudo
  • Patent number: 5249167
    Abstract: The present invention provides an optical pickup apparatus for reading informational signals written in a recording medium such as magneto-optical disc in which a flux of reflected light from a recording medium which is irradiated with a flux of light in inclinedly incident from one side upon a flat plate like transparent member having one side which is a polarization reflection surface and the other side which is a total reflection surface and fluxes of light reflected on the one side and the other side of the flat plate like transparent member are detected by a photo detecting element, whereby simplification of the structure is achieved.
    Type: Grant
    Filed: July 24, 1991
    Date of Patent: September 28, 1993
    Assignee: Sony Corporation
    Inventor: Katsuhiro Seo