Patents by Inventor Tetsuyuki Miyawaki

Tetsuyuki Miyawaki 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).

  • Projection-type display device
    Patent number: 6783241
    Abstract: A projection-type display device which is used in a projector device for projecting optical images spatially modulated by reflection-type liquid crystal panels onto a screen to display an image, wherein a wavelength separation mirror is arranged so that an angle exhibited by an optical axis of light incident on the wavelength separation mirror and the optical axis of reflected light becomes smaller than 90 degrees or polarization filters or polarization separation elements are arranged on an incident facet side or an emission facet side of optical separation elements.
    Type: Grant
    Filed: October 22, 2001
    Date of Patent: August 31, 2004
    Assignee: Sony Corporation
    Inventors: Tetsuyuki Miyawaki, Hideki Yamamoto
  • Projection-type display device and method of adjustment thereof
    Patent number: 6520645
    Abstract: A projection-type display device for displaying an image using a projector device emitting optical images spatially modulated by reflection-type liquid crystal panels onto a screen, wherein phase difference plates are arranged at the incidence planes of the reflection-type liquid panels so as to cancel out the retardation comprised of the retardation corresponding to one-quarter of the wavelength of the incident light due to the polarization beam splitter plus the retardations due to the dichroic mirrors of the color separating and synthesizing means, whereby it is possible to make the illumination light leaking from the polarization beam splitter to the projection lens at the black level portions extremely small and possible to prevent a reduction in the contrast due to the haze phenomenon.
    Type: Grant
    Filed: October 9, 2001
    Date of Patent: February 18, 2003
    Assignee: Sony Corporation
    Inventors: Hideki Yamamoto, Tetsuyuki Miyawaki
  • Projection-type display device
    Publication number: 20020122157
    Abstract: A projection-type display device which is used in a projector device for projecting optical images spatially modulated by reflection-type liquid crystal panels onto a screen to display an image, wherein a wavelength separation mirror is arranged so that an angle exhibited by an optical axis of light incident on the wavelength separation mirror and the optical axis of reflected light becomes smaller than 90 degrees or polarization filters or polarization separation elements are arranged on an incident facet side or an emission facet side of optical separation elements.
    Type: Application
    Filed: October 22, 2001
    Publication date: September 5, 2002
    Inventors: Tetsuyuki Miyawaki, Hideki Yamamoto
  • Projection-type display device
    Patent number: 6394606
    Abstract: A projection-type display device which is used in a projector device for projecting optical images spatially modulated by reflection-type liquid crystal panels onto a screen to display an image, wherein a wavelength separation mirror is arranged so that an angle exhibited by an optical axis of light incident on the wavelength separation mirror and the optical axis of reflected light becomes smaller than 90 degrees or polarization filters or polarization separation elements are arranged on an incident facet side or an emission facet side of optical separation elements.
    Type: Grant
    Filed: September 23, 1999
    Date of Patent: May 28, 2002
    Assignee: Sony Corporation
    Inventors: Tetsuyuki Miyawaki, Hideki Yamamoto
  • Projection-type display device and method of adjustment thereof
    Publication number: 20020033932
    Abstract: A projection-type display device for displaying an image using a projector device emitting optical images spatially modulated by reflection-type liquid crystal panels onto a screen, wherein phase difference plates are arranged at the incidence planes of the reflection-type liquid panels so as to cancel out the retardation comprised of the retardation corresponding to one-quarter of the wavelength of the incident light due to the polarization beam splitter plus the retardations due to the dichroic mirrors of the color separating and synthesizing means, whereby it is possible to make the illumination light leaking from the polarization beam splitter to the projection lens at the black level portions extremely small and possible to prevent a reduction in the contrast due to the haze phenomenon.
    Type: Application
    Filed: October 9, 2001
    Publication date: March 21, 2002
    Inventors: Hideki Yamamoto, Tetsuyuki Miyawaki
  • Projection-type display device and method of adjustment thereof
    Patent number: 6331060
    Abstract: A projection-type display device for displaying an image using a projector device emitting optical images spatially modulated by reflection-type liquid crystal panels onto a screen, wherein phase difference plates are arranged at the incidence planes of the reflection-type liquid panels so as to cancel out the retardation comprised of the retardation corresponding to one-quarter of the wavelength of the incident light due to the polarization beam splitter plus the retardations due to the dichroic mirrors of the color separating and synthesizing means, whereby it is possible to make the illumination light leaking from the polarization beam splitter to the projection lens at the black level portions extremely small and possible to prevent a reduction in the contrast due to the haze phenomenon.
    Type: Grant
    Filed: October 6, 1999
    Date of Patent: December 18, 2001
    Assignee: Sony Corporation
    Inventors: Hideki Yamamoto, Tetsuyuki Miyawaki