Patents by Inventor Ryuichiro Shimizu

Ryuichiro Shimizu 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: 7719657
    Abstract: The present application relates to a liquid crystal lens element and an optical head device, in particular order, to a liquid crystal lens capable of switching the focal length among a plurality of different focal lengths according to switching of applied voltage among a plurality of applied voltages, and an optical head device employing the liquid crystal lens, for writing and/or reading an information to/from an optical recording medium.
    Type: Grant
    Filed: October 30, 2006
    Date of Patent: May 18, 2010
    Assignee: Asahi Glass Company, Limited
    Inventors: Yoshiharu Ooi, Yuzuru Tanabe, Hiromasa Sato, Takuji Nomura, Ryuichiro Shimizu
  • 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: 20070146625
    Abstract: A liquid crystal lens element is provided, which can realize a small sized element having no moving part, and which has a lens function of switching the focal length among multiple focal lengths of at least 3 types according to an applied voltage.
    Type: Application
    Filed: October 30, 2006
    Publication date: June 28, 2007
    Applicant: ASAHI GLASS COMPANY LIMITED
    Inventors: Yoshiharu Ooi, Yuzuru Tanabe, Hiromasa Sato, Takuji Nomura, Ryuichiro Shimizu
  • 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