Patents by Inventor Keiko Hirao

Keiko Hirao 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).

  • Pickup lens with phase compensator and optical pickup apparatus using the same
    Patent number: 7855940
    Abstract: A pickup lens with a phase compensator is composed of a condenser lens and a phase compensator. At least one surface of the condenser lens has a step-like annular zone structure to compensate wavefront aberration generated when recording and reproducing data on an information recording medium having a substrate thickness of t1 with a laser beam having a wavelength ?1 and wavefront aberration generated when recording and reproducing data on an information recording medium having a substrate thickness of t2 with a laser beam having a wavelength ?2. The phase compensator compensates wavefront aberration generated when recording and reproducing data on an information recording medium having a substrate thickness of t3 with a laser beam having a wavelength ?3.
    Type: Grant
    Filed: July 28, 2009
    Date of Patent: December 21, 2010
    Assignee: Hitachi Maxell, Ltd.
    Inventors: Koichiro Wakabayashi, Keiko Hirao, Mitsuhiro Miyauchi, Yutaka Makino, Yasuyuki Sugi, Yoshikazu Mitsui
  • PICKUP LENS WITH PHASE COMPENSATOR AND OPTICAL PICKUP APPARATUS USING THE SAME
    Publication number: 20090285080
    Abstract: A pickup lens with a phase compensator is composed of a condenser lens and a phase compensator. At least one surface of the condenser lens has a step-like annular zone structure to compensate wavefront aberration generated when recording and reproducing data on an information recording medium having a substrate thickness of t1 with a laser beam having a wavelength ?1 and wavefront aberration generated when recording and reproducing data on an information recording medium having a substrate thickness of t2 with a laser beam having a wavelength ?2. The phase compensator compensates wavefront aberration generated when recording and reproducing data on an information recording medium having a substrate thickness of t3 with a laser beam having a wavelength ?3.
    Type: Application
    Filed: July 28, 2009
    Publication date: November 19, 2009
    Applicant: HITACHI MAXELL, LTD.
    Inventors: Koichiro WAKABAYASHI, Keiko Hirao, Mitsuhiro Miyauchi, Yutaka Makino, Yasuyuki Sugi, Yoshikazu Mitsui
  • Pickup lens with phase compensator and optical pickup apparatus using the same
    Patent number: 7586815
    Abstract: A pickup lens with a phase compensator is composed of a condenser lens and a phase compensator. At least one surface of the condenser lens has a step-like annular zone structure to compensate wavefront aberration generated when recording and reproducing data on an information recording medium having a substrate thickness of t1 with a laser beam having a wavelength ?1 and wavefront aberration generated when recording and reproducing data on an information recording medium having a substrate thickness of t2 with a laser beam having a wavelength ?2. The phase compensator compensates wavefront aberration generated when recording and reproducing data on an information recording medium having a substrate thickness of t3 with a laser beam having a wavelength ?3.
    Type: Grant
    Filed: October 19, 2005
    Date of Patent: September 8, 2009
    Assignee: Hitachi Maxell, Ltd.
    Inventors: Koichiro Wakabayashi, Keiko Hirao, Mitsuhiro Miyauchi, Yutaka Makino, Yasuyuki Sugi, Yoshikazu Mitsui
  • Pickup lens with phase compensator and optical pickup apparatus using the same
    Publication number: 20060083122
    Abstract: A pickup lens with a phase compensator is composed of a condenser lens and a phase compensator. At least one surface of the condenser lens has a step-like annular zone structure to compensate wavefront aberration generated when recording and reproducing data on an information recording medium having a substrate thickness of t1 with a laser beam having a wavelength ?1 and wavefront aberration generated when recording and reproducing data on an information recording medium having a substrate thickness of t2 with a laser beam having a wavelength ?2. The phase compensator compensates wavefront aberration generated when recording and reproducing data on an information recording medium having a substrate thickness of t3 with a laser beam having a wavelength ?3.
    Type: Application
    Filed: October 19, 2005
    Publication date: April 20, 2006
    Applicant: HITACHI MAXELL, LTD.
    Inventors: Koichiro Wakabayashi, Keiko Hirao, Mitsuhiro Miyauchi, Yutaka Makino, Yasuyuki Sugi, Yoshikazu Mitsui