Patents by Inventor Takahiko Matsuba

Takahiko Matsuba 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).

  • Wave plate
    Patent number: 7715301
    Abstract: An optical element having an optical multi-layer coating which can function as a phase plate without using quartz crystal or an optical film. The optical multi-layer coating is deposited on a plane which is set up on the optical element by way of a perpendicularly intersecting plane located on perpendicularly intersecting X- and Y-axes in perpendicularly intersecting relation with optical axis of an incident light beam on the optical multi-layer coating, the perpendicularly intersecting plane being inclined through a predetermined angle about the X- and/or Y-axis to establish a phase differential between two linearly polarized components of the incident light beam.
    Type: Grant
    Filed: September 5, 2006
    Date of Patent: May 11, 2010
    Assignee: Fujinon Corporation
    Inventors: Homin Ryu, Hajime Kurahashi, Takahiko Matsuba, Yoshiji Kawamura
  • Polarizing filter, and method for fabricating same
    Patent number: 7538944
    Abstract: A polarizing filter with a gapless polarization separating filter layer formed between a plane of incidence and a plate of transmission of the filter, the polarization separating filter layer being formed by connecting first filter layer sections alternately and crosswise with second inclined filter layer sections in an approximately zigzag shape. The filter is free of the problem of light leakage and can perform the functions of a polarizing filter satisfactorily.
    Type: Grant
    Filed: April 11, 2007
    Date of Patent: May 26, 2009
    Assignee: Fujinon Corporation
    Inventors: Takahiko Matsuba, Yoshiji Kawamura, Homin Ryu, Hajime Kurahashi
  • POLARIZING FILTER, AND METHOD FOR FABRICATING SAME
    Publication number: 20080018996
    Abstract: A polarizing filter with a gapless polarization separating filter layer formed between a plane of incidence and a plate of transmission of the filter, the polarization separating filter layer being formed by connecting first filter layer sections alternately and crosswise with second inclined filter layer sections in an approximately zigzag shape. The filter is free of the problem of light leakage and can perform the functions of a polarizing filter satisfactorily.
    Type: Application
    Filed: April 11, 2007
    Publication date: January 24, 2008
    Applicant: FUJINON SANO CORPORATION
    Inventors: Takahiko Matsuba, Yoshiji Kawamura, Homin Ryu, Hajime Kurahashi
  • OPTICAL ELEMENT, AND OPTICAL PICKUP
    Publication number: 20070053271
    Abstract: An optical element having an optical multi-layer coating which can function as a phase plate without using quartz crystal or an optical film. The optical multi-layer coating is deposited on a plane which is set up on the optical element by way of a perpendicularly intersecting plane located on perpendicularly intersecting X- and Y-axes in perpendicularly intersecting relation with optical axis of an incident light beam on the optical multi-layer coating, the perpendicularly intersecting plane being inclined through a predetermined angle about the X- and/or Y-axis to establish a phase differential between two linearly polarized components of the incident light beam.
    Type: Application
    Filed: September 5, 2006
    Publication date: March 8, 2007
    Applicant: FUJINON SANO CORPORATION
    Inventors: Homin Ryu, Hajime Kurahashi, Takahiko Matsuba, Yoshiji Kawamura