Patents by Inventor Taiji Minakawa

Taiji Minakawa 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).

  • Objective lens, optical pickup device, and optical disc device
    Patent number: 8599672
    Abstract: Provided is an objective lens including a diffraction portion provided on a laser beam incident plane or output plane. The diffraction portion includes first second, and third diffraction regions, wherein first laser beams corresponding to a first optical disc having a first transmissive layer are condensed on a data recording portion of the first optical disc, second laser beams corresponding to a second optical disc having a second transmissive layer thicker than the first transmissive layer are condensed on a data recording portion of the second optical disc, and third laser beams corresponding to a third optical disc having a third transmissive layer thicker than the second transmissive layer are condensed on a data recording portion of the third optical disc. An evaluation parameter calculated on the basis of an in-plane efficiency distribution function has a value corresponding to a symbol error rate that is less than a predetermined value.
    Type: Grant
    Filed: August 31, 2012
    Date of Patent: December 3, 2013
    Assignee: Sony Corporation
    Inventors: Motoo Aiba, Hiroyuki Sakakibara, Taiji Minakawa, Fumihiko Hanzawa, Masashi Abe, Jun Adachi, Katsutoshi Sato
  • OBJECTIVE LENS, OPTICAL PICKUP DEVICE, AND OPTICAL DISC DEVICE
    Publication number: 20130094339
    Abstract: Provided is an objective lens including a diffraction portion provided on a laser beam incident plane or output plane. The diffraction portion includes first second, and third diffraction regions, wherein first laser beams corresponding to a first optical disc having a first transmissive layer are condensed on a data recording portion of the first optical disc, second laser beams corresponding to a second optical disc having a second transmissive layer thicker than the first transmissive layer are condensed on a data recording portion of the second optical disc, and third laser beams corresponding to a third optical disc having a third transmissive layer thicker than the second transmissive layer are condensed on a data recording portion of the third optical disc. An evaluation parameter calculated on the basis of an in-plane efficiency distribution function has a value corresponding to a symbol error rate that is less than a predetermined value.
    Type: Application
    Filed: August 31, 2012
    Publication date: April 18, 2013
    Applicant: Sony Corporation
    Inventors: Motoo Aiba, Hiroyuki Sakakibara, Taiji Minakawa, Fumihiko Hanzawa, Masashi Abe, Jun Adachi, Katsutoshi Sato