Patents by Inventor Mitsuo Oosawa

Mitsuo Oosawa 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).

  • Liquid crystal lens element and optical head device
    Patent number: 7773489
    Abstract: A liquid crystal lens element capable of finely adjusting focal length according to the magnitude of applied voltage, and an optical head device employing such a liquid crystal lens element, are provided. On one surface of a transparent substrate 511, a transparent electrode 513 and a concave-convex portion 517 made of a transparent material having a cross section shape approximated by a saw-tooth shape, are formed so as to constitute a plurality of annular portions, and on one surface of a transparent substrate 512, a transparent electrode 514 is formed. The transparent electrodes 513 and 514 constitute annular divided electrode segments, and division positions of the annular electrode segments are made to be agree with division positions of annular portions of the saw-tooth-shaped concave-convex portion 517 of the transparent substrate 511.
    Type: Grant
    Filed: February 2, 2007
    Date of Patent: August 10, 2010
    Assignee: Asahi Glass Company, Limited
    Inventors: Kouichi Murata, Takuji Nomura, Mitsuo Oosawa, Yoshiharu Ooi, Yuzuru Tanabe
  • Liquid crystal lens element optical head device
    Patent number: 7738344
    Abstract: A liquid crystal lens element is provided, which does not produce change of transmission wavefront regardless of polarization state of incident light when it is off-state at a time of no voltage application, and which exhibits concave lens function for extraordinarily polarized incident light when it is on-state at a time of voltage application.
    Type: Grant
    Filed: January 19, 2007
    Date of Patent: June 15, 2010
    Assignee: Asahi Glass Company, Limited
    Inventors: Yoshiharu Ooi, Takuji Nomura, Toshimasa Kakiuchi, Mitsuo Oosawa, Yuzuru Tanabe
  • Liquid crystal lens element and optical head device
    Patent number: 7388822
    Abstract: A liquid crystal lens element having a lens function is provided, which is small sized without having moving part, and which can stably carry out correction of spherical aberration containing a power component corresponding to focal point change of incident light.
    Type: Grant
    Filed: August 3, 2006
    Date of Patent: June 17, 2008
    Assignee: Asahi Glass Company, Limited
    Inventors: Yoshiharu Ooi, Hiromasa Sato, Ryuichiro Shimizu, Takuji Nomura, Yuzuru Tanabe, Mitsuo Oosawa
  • LIQUID CRYSTAL LENS ELEMENT AND OPTICAL HEAD DEVICE
    Publication number: 20070183293
    Abstract: A liquid crystal lens element capable of finely adjusting focal length according to the magnitude of applied voltage, and an optical head device employing such a liquid crystal lens element, are provided. On one surface of a transparent substrate 511, a transparent electrode 513 and a concave-convex portion 517 made of a transparent material having a cross section shape approximated by a saw-tooth shape, are formed so as to constitute a plurality of annular portions, and on one surface of a transparent substrate 512, a transparent electrode 514 is formed. The transparent electrodes 513 and 514 constitute annular divided electrode segments, and division positions of the annular electrode segments are made to be agree with division positions of annular portions of the saw-tooth-shaped concave-convex portion 517 of the transparent substrate 511.
    Type: Application
    Filed: February 2, 2007
    Publication date: August 9, 2007
    Applicant: ASAHI GLASS CO., LTD.
    Inventors: Kouichi MURATA, Takuji Nomura, Mitsuo Oosawa, Yoshiharu Ooi, Yuzuru Tanabe
  • LIQUID CRYSTAL LENS ELEMENT OPTICAL HEAD DEVICE
    Publication number: 20070127348
    Abstract: A liquid crystal lens element is provided, which does not produce change of transmission wavefront regardless of polarization state of incident light when it is off-state at a time of no voltage application, and which exhibits concave lens function for extraordinarily polarized incident light when it is on-state at a time of voltage application.
    Type: Application
    Filed: January 19, 2007
    Publication date: June 7, 2007
    Applicant: ASAHI GLASS COMPANY LIMITED
    Inventors: Yoshiharu Ooi, Takuji Nomura, Toshimasa Kakiuchi, Mitsuo Oosawa, Yuzuru Tanabe
  • Liquid crystal lens element and optical head device
    Publication number: 20060280100
    Abstract: A liquid crystal lens element having a lens function is provided, which is small sized without having moving part, and which can stably carry out correction of spherical aberration containing a power component corresponding to focal point change of incident light.
    Type: Application
    Filed: August 3, 2006
    Publication date: December 14, 2006
    Applicant: ASAHI GLASS COMPANY LIMITED
    Inventors: Yoshiharu Ooi, Hiromasa Sato, Ryuichiro Shimizu, Takuji Nomura, Yuzuru Tanabe, Mitsuo Oosawa