Patents by Inventor Takashi Matsumaru

Takashi Matsumaru 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).

  • Optical pickup lens, molded optical component, handling method, and mold for optical component
    Patent number: 7012767
    Abstract: An objective lens for use in an optical pickup apparatus for conducting recording and/or reproducing information for an optical information recording medium, has a lens section shaped in an approximate circle and including a flange section; and a projecting section integrally provided to the lens section. The objective lens satisfies the following conditional formulas: 0.5?A?2.0, 0.3A?B?1.7A where A is a diameter (mm) of the lens section when the lens section is viewed from an direction of an optical axis, and B is a width (mm) of the projecting section when the connecting section is viewed from the direction of the optical axis.
    Type: Grant
    Filed: February 10, 2004
    Date of Patent: March 14, 2006
    Assignee: Konica Minolta Holdings, Inc.
    Inventors: Shogo Yamamoto, Hiroyuki Hattori, Etsuzo Kurihara, Shinichiro Saito, Takashi Matsumaru, Taichiro Saito, Kazuo Ishida, Yuichi Atarashi, Norikazu Arai
  • Molded optical component, handling method, and assembling method
    Patent number: 6894849
    Abstract: An objective lens for use in an optical pickup apparatus for conducting recording and/or reproducing information for an optical information recording medium, has a lens section shaped in an approximate circle and including a flange section; and a connecting section integrally provided to the lens section. The objective lens satisfies the following conditional formulas: 0.5?A?2.0, 0.3A?B?1.7A where A is a diameter of the lens section when the lens section is viewed from an direction of an optical axis, and B is a width of the connecting section when the connecting section is viewed from the direction of the optical axis.
    Type: Grant
    Filed: October 16, 2003
    Date of Patent: May 17, 2005
    Assignee: Konica Corporation
    Inventors: Shogo Yamamoto, Hiroyuki Hattori, Etsuzo Kurihara, Shinichiro Saito, Takashi Matsumaru, Taichiro Saito, Kazuo Ishida, Yuichi Atarashi, Norikazu Arai
  • Optical pickup lens, molded optical component, handling method, and mold for optical component
    Publication number: 20040223236
    Abstract: An objective lens for use in an optical pickup apparatus for conducting recording and/or reproducing information for an optical information recording medium, has a lens section shaped in an approximate circle and including a flange section; and a projecting section integrally provided to the lens section.
    Type: Application
    Filed: February 10, 2004
    Publication date: November 11, 2004
    Inventors: Shogo Yamamoto, Hiroyuki Hattori, Etsuzo Kurihara, Shinichiro Saito, Takashi Matsumaru, Taichiro Saito, Kazuo Ishida, Yuichi Atarashi, Norikazu Arai
  • Optical pickup lens, molded optical component, handling method, and mold for optical component
    Patent number: 6765732
    Abstract: An objective lens for use in an optical pickup apparatus for conducting recording and/or reproducing information for an optical information recording medium, has a lens section shaped in an approximate circle and including a flange section; and a connecting section integrally provided to the lens section. The objective lens satisfies the following conditional formulas: 0.5≦A≦2.0, 0.3A≦B≦1.7A where A is a diameter of the lens section when the lens section is viewed from an direction of an optical axis, and B is a width of the connecting section when the connecting section is viewed from the direction of the optical axis.
    Type: Grant
    Filed: July 29, 2002
    Date of Patent: July 20, 2004
    Assignee: Konica Corporation
    Inventors: Shogo Yamamoto, Hiroyuki Hattori, Etsuzo Kurihara, Shinichiro Saito, Takashi Matsumaru, Taichiro Saito, Kazuo Ishida, Yuichi Atarashi, Norikazu Arai
  • Optical pickup lens, molded optical component, handling method, and mold for optical component
    Publication number: 20040081060
    Abstract: An objective lens for use in an optical pickup apparatus for conducting recording and/or reproducing information for an optical information recording medium, has a lens section shaped in an approximate circle and including a flange section; and a connecting section integrally provided to the lens section.
    Type: Application
    Filed: October 16, 2003
    Publication date: April 29, 2004
    Applicant: Konica Corporation
    Inventors: Shogo Yamamoto, Hiroyuki Hattori, Etsuzo Kurihara, Shinichiro Saito, Takashi Matsumaru, Taichiro Saito, Kazuo Ishida, Yuichi Atarashi, Norikazu Arai
  • Optical pickup lens, molded optical components, handling method, and mold for optical component
    Publication number: 20040080837
    Abstract: An objective lens for use in an optical pickup apparatus for conducting recording and/or reproducing information for an optical information recording medium, has a lens section shaped in an approximate circle and including a flange section;.and a connecting section integrally provided to the lens section.
    Type: Application
    Filed: October 16, 2003
    Publication date: April 29, 2004
    Applicant: Konica Corporation
    Inventors: Shogo Yamamoto, Hiroyuki Hattori, Etsuzo Kurihara, Shinichiro Saito, Takashi Matsumaru, Taichiro Saito, Kazuo Ishida, Yuichi Atarashi, Norikazu Arai
  • Optical pickup lens, molded optical component, handling method, and mold for optical component
    Publication number: 20030026007
    Abstract: An objective lens for use in an optical pickup apparatus for conducting recording and/or reproducing information for an optical information recording medium, has a lens section shaped in an approximate circle and including a flange section; and a connecting section integrally provided to the lens section.
    Type: Application
    Filed: July 29, 2002
    Publication date: February 6, 2003
    Applicant: KONICA CORPORATION
    Inventors: Shogo Yamamoto, Hiroyuki Hattori, Etsuzo Kurihara, Shinichiro Saito, Takashi Matsumaru, Taichiro Saito, Kazuo Ishida, Yuichi Atarashi, Norikazu Arai
  • Device for recording or reproducing information on an optical recording medium having an objective lens with an astigmatism producing off optical axis minimum total astigmatism position to correct tracking astigmatism
    Patent number: 5754504
    Abstract: A device for recording and reproducing on an optical information recording medium, includes a light source composed of a semiconductor laser to emit a divergent luminous flux; an objective lens to receive the divergent luminous flux and to converge the divergent luminous flux onto the optical information recording medium; and a tracker for tracking a converged luminous flux on the optical information recording medium by moving the objective lens in a direction perpendicular to an optical axis. The objective lens has an astigmatism so that a quantity of the astigmatism of a wavefront emitted from the objective lens shows a minimum value at a position where the objective lens is moved in the direction perpendicular to the optical axis by a tracking operation of the tracker.
    Type: Grant
    Filed: November 2, 1995
    Date of Patent: May 19, 1998
    Assignee: Konica Corporation
    Inventors: Hiroyuki Yamazaki, Takashi Matsumaru
  • Gas igniter or the like
    Patent number: D293603
    Type: Grant
    Filed: November 18, 1985
    Date of Patent: January 5, 1988
    Assignee: Tanita Corporation
    Inventor: Takashi Matsumaru
  • Gas igniter or the like
    Patent number: D294329
    Type: Grant
    Filed: November 18, 1985
    Date of Patent: February 23, 1988
    Assignee: Tanita Corporation
    Inventor: Takashi Matsumaru