Patents by Inventor Masahiko Yatsu

Masahiko Yatsu 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 Image Display Apparatus
    Publication number: 20110299047
    Abstract: A projection type image display apparatus includes an image display element, a projection unit including a first lens group and a second lens group formed with a plural number of lenses, a reflection mirror configured to reflect light emitted from the second lens group thereon after the light passes through the first lens group so as to project the light on a screen obliquely, and a mechanism configured to enable movement of at least one lens of the second lens group in a direction of an optical axis. The first lens group is fixed with respect to a bottom portion of the mechanism and is configured to compensate for an aberration of an optical system thereof. The second lens group is configured to enable movement of at least one lens of the second lens group with respect to the first lens group and the bottom portion of the mechanism.
    Type: Application
    Filed: August 19, 2011
    Publication date: December 8, 2011
    Inventors: Koji Hirata, Takanori Hisada, Masahiko Yatsu
  • PROJECTION DISPLAY
    Publication number: 20110234982
    Abstract: A projection type image display apparatus is provided which includes a housing to hold an optical system including multi-lenses, a polarized-light conversion element and a color separation portion. The housing operates to provide an optical path between a light source, located outside the housing, and penetration-type image display elements and an optical synthesizing portion also located outside of the housing.
    Type: Application
    Filed: June 7, 2011
    Publication date: September 29, 2011
    Inventors: Koji HIRATA, Masahiko Yatsu
  • Projection type image display apparatus
    Patent number: 8020999
    Abstract: A projection type image display apparatus includes an image display element, and a projection optical unit, which is configured to project an image displayed on the image display element, enlargedly, upon a screen. The projection optical unit includes a lens group, which is configured to compensate an distortion on an image surface on the screen, a mirror for compensating a trapezoidal distortion on the screen. The mirror reflects lights emitted from the lens group, so as to project upon the screen obliquely.
    Type: Grant
    Filed: June 29, 2010
    Date of Patent: September 20, 2011
    Assignee: Hitachi, Ltd.
    Inventors: Koji Hirata, Takanori Hisada, Masahiko Yatsu
  • Projection type image display apparatus
    Patent number: 8002418
    Abstract: A projection type image display apparatus includes an image display element, a lens group disposed in a direction of propagation of light with respect to the image display element and being formed with a plural number of lenses, a s reflection mirror configured to reflect light emitted from the lens group thereon so as to project the light on a screen, obliquely, and a housing configured to receive the reflection mirror and the lens group therein. The lens group is fixed on a bottom portion of the housing, and a part of the lens group is configured to enable movement of lenses of the lens group.
    Type: Grant
    Filed: December 6, 2010
    Date of Patent: August 23, 2011
    Assignee: Hitachi, Ltd.
    Inventors: Koji Hirata, Takanori Hisada, Masahiko Yatsu
  • Projection-type image display apparatus
    Patent number: 8002417
    Abstract: A projection-type image display apparatus for projecting an image, enlargedly, onto a projection surface, comprises: an image display element; a lens group, being disposed behind the image display element, comprising therein, a front lens group made up with a plural number of lenses, including, at least, a refractive lens, and a rear lens group made up with a plural number of lenses, including, at least, a lens having a free curved surface configuration and being rotationally asymmetric, thereby emitting an image displayed on the image display element; a reflection mirror for reflecting the light from the lens group, thereby projection onto the projection surface, obliquely; and a movement member for moving the plural number of lenses of the rear lens group.
    Type: Grant
    Filed: July 21, 2010
    Date of Patent: August 23, 2011
    Assignee: Hitachi, Ltd.
    Inventors: Takanori Hisada, Koji Hirata, Masahiko Yatsu
  • Projection display
    Patent number: 7982958
    Abstract: A projection type image display apparatus is provided which includes a housing to hold an optical system including multi-lenses, a polarized-light conversion element and the color separation portion. The housing operates to provide an optical path between a light source, located outside the housing, and penetration-type image display elements and an optical synthesizing portion also located outside of the housing.
    Type: Grant
    Filed: April 7, 2009
    Date of Patent: July 19, 2011
    Assignee: Hitachi, Ltd.
    Inventors: Koji Hirata, Masahiko Yatsu
  • Display Apparatus And Projection Type Lighting Apparatus Therefor
    Publication number: 20110128472
    Abstract: A display apparatus includes a light source which is configured to emit a light, a first light modulation unit which is configured modulate the light emitted from said light source, a first drive unit which is configured to drive said first light modulation unit, a projection unit, which is configured to project the light from said first light modulation unit enlargedly, a second light modulation unit, which is configured to modulate the light emitted from said projection unit so as to be emitted to an observer side, a second drive unit which is configured to drive said second light modulation unit, and an optical direction conversion unit, which is configured to convert the light from said projection unit so that the light is incident upon an incident surface of said second light modulation unit in a direction approximately perpendicular thereto.
    Type: Application
    Filed: February 4, 2011
    Publication date: June 2, 2011
    Inventors: Koji Hirata, Masahiko Yatsu, Takanori Hisada, Hidehiro Ikeda
  • Projection-Type Image Display Apparatus
    Publication number: 20110122328
    Abstract: A projection-type image display apparatus includes an enlarging projection optical unit which is configured to project an image displayed on an image display element enlargedly upon a display portion, a display controller portion which is configured to move a position of the image within a display surface of the image display element. The enlarging projection optical unit has a lens group for projecting the image enlargedly, wherein the display controller portion moves the image so as to display the image within the display surface of the image display element by projecting a portion selectively fitted to the display portion when displaying on the display portion through the enlarging projection optical unit.
    Type: Application
    Filed: February 7, 2011
    Publication date: May 26, 2011
    Inventors: Koji Hirata, Masahiko Yatsu
  • PROJECTION TYPE IMAGE DISPLAY DEVICE
    Publication number: 20110075100
    Abstract: A projection type image display device using, in a projection optical system thereof, a flat mirror, which is easy to design and manufacture, as a projection mirror is provided. The projection optical system is a diagonal projection optical system and includes plural lenses. Among the plural lenses, the one disposed closest to the flat mirror has an effective area, along the vertical direction of an image, through which a light beam passes and which is off the optical axis, among optical axes of the plural lenses, shared by the most lenses so as not to allow light reflected from the projection mirror to return to the projector body. A polarization converter using, for example, a quarter wavelength plate is provided at an output surface of a crossed prism to decrease reflectance differences between differently colored light and to thereby prevent the occurrence of color unevenness.
    Type: Application
    Filed: May 7, 2010
    Publication date: March 31, 2011
    Inventors: Nobuyuki Kimura, Koji Hirata, Masahiko Yatsu
  • Video Projector
    Publication number: 20110075115
    Abstract: An object of the invention is to reduce the size and weight of a video projector by shortening the length of the arm of a mirror rotator and reducing the size of a mirror. A video projector comprises a plurality of projection lenses through which image light rays from a liquid crystal panel are extracted in a magnified manner; a reflective mirror for reflecting the extracted image light rays onto a screen; and a mirror rotator for rotating the reflective mirror so that the extracted image light rays can be reflected in particular directions. Among the projection lenses, some of the projection lenses located farther away from the liquid crystal penal are partially cut such that areas through which the image light rays do not pass are cut off to create a lens cut-off space. The mirror rotator is placed in the lens cut-off space.
    Type: Application
    Filed: June 3, 2010
    Publication date: March 31, 2011
    Applicant: Hitachi Consumer Electronics Co., Ltd.
    Inventors: Chohei Ono, Naoyuki Ogura, Koji Hirata, Masahiko Yatsu, Masayuki Fukui, Megumi Kurachi
  • Projection Type Image Display Apparatus
    Publication number: 20110075113
    Abstract: A projection type image display apparatus includes an image display element, a lens group disposed in a direction of propagation of light with respect to the image display element and being formed with a plural number of lenses, a s reflection mirror configured to reflect light emitted from the lens group thereon so as to project the light on a screen, obliquely, and a housing configured to receive the reflection mirror and the lens group therein. The lens group is fixed on a bottom portion of the housing, and a part of the lens group is configured to enable movement of lenses of the lens group.
    Type: Application
    Filed: December 6, 2010
    Publication date: March 31, 2011
    Inventors: Koji Hirata, Takanori Hisada, Masahiko Yatsu
  • Projection type image display apparatus
    Patent number: 7914153
    Abstract: A projection type image display apparatus includes a lens group, being disposed adjacent to an image display element, which is configured to include a plural number of lenses, and a mirror, which is configured to reflect emission lights from the lens group, so as to project upon the screen obliquely. A ratio (Lo/Lp) between a distance (Lp) from a center of the mirror up to the screen and a diagonal size (Lo) of the screen is at least 2.
    Type: Grant
    Filed: June 29, 2010
    Date of Patent: March 29, 2011
    Assignee: Hitachi, Ltd.
    Inventors: Koji Hirata, Takanori Hisada, Masahiko Yatsu
  • Projection-type image display apparatus
    Patent number: 7909472
    Abstract: A projection-type image display apparatus includes an image display element, a light source unit, an enlarging projection optical unit, and a display controller portion. The enlarging projection optical unit, includes a projection lens, a group of lenses which are disposed on a same optical axis, sequentially arranged from a side of the image display element and which include at least one lens having a lens surface, and a reflection mirror having a reflection surface which is disposed between the group of lenses and a display portion. The image display element has a display surface larger than a display surface of the display portion, when an entirety of the image display element is enlargedly projected on the display portion through the enlarging projection optical unit; and the display controller portion enables movement of the image on the display surface of the image display element.
    Type: Grant
    Filed: February 12, 2010
    Date of Patent: March 22, 2011
    Assignee: Hitachi, Ltd.
    Inventors: Koji Hirata, Masahiko Yatsu
  • Display apparatus and projection type lighting apparatus therefor
    Patent number: 7901097
    Abstract: A display apparatus comprises a lighting unit for emitting a light, and a first light modulation unit for forming an image through modulation of the light from a light source unit, wherein the lighting unit includes a light source for emitting the light, a second light modulation unit for modulating the light from the light source, being smaller than the first light modulation unit for modulating the light from the light source, and a projection unit for projecting the light modulated through the second light modulation unit, enlargely, upon the first light modulation unit for use of display.
    Type: Grant
    Filed: February 14, 2008
    Date of Patent: March 8, 2011
    Assignee: Hitachi, Ltd.
    Inventors: Koji Hirata, Masahiko Yatsu, Takanori Hisada, Hidehiro Ikeda
  • Projection type display apparatus
    Patent number: 7896507
    Abstract: In a projection type display apparatus for enabling to display an image, by projecting an image on an image display element(s), enlargedly, upon a nearly horizontal surface, such as, a table, a reflection mirror for reflecting a light from a light source is so disposed that an optical axis of the light source is nearly perpendicular to an optical axis of a lens group having a plural number of lens elements, which are disposed symmetric with respect to the optical axis.
    Type: Grant
    Filed: January 31, 2008
    Date of Patent: March 1, 2011
    Assignee: Hitachi, Ltd.
    Inventors: Koji Hirata, Masahiko Yatsu, Takanori Hisada
  • PROJECTION TYPE DISPLAY APPARATUS
    Publication number: 20110025991
    Abstract: In a projection type display apparatus for enabling to display an image, by projecting an image on an image display element(s), enlargedly, upon a nearly horizontal surface, such as, a table, a reflection mirror for reflecting a light from a light source is so disposed that an optical axis of the light source is nearly perpendicular to an optical axis of a lens group having a plural number of lens elements, which are disposed symmetric with respect to the optical axis.
    Type: Application
    Filed: October 8, 2010
    Publication date: February 3, 2011
    Inventors: Koji HIRATA, Masahiko Yatsu, Takanori Hisada
  • Projection optical unit, projection-type image displaying apparatus and projection-type image displaying system
    Patent number: 7857462
    Abstract: A projection optical unit for a projection display apparatus, which displays an image upon a projection surface, obliquely, includes a front lens group disposed in a direction from an image display element to a projection surface, a rear lens group, and a reflection mirror formed so that a curvature of a portion for reflecting a light beam incident upon a lower end portion of the projection surface is larger than a curvature of a portion for reflecting a light beam incident upon an upper end of the projection surface. An optical axis of the front lens group and the rear lens group is more inclined with respect to a direction of the portion of the reflection mirror for reflecting the light beam incident upon the lower end portion of the projection surface than a normal line direction of the image display element.
    Type: Grant
    Filed: July 19, 2010
    Date of Patent: December 28, 2010
    Assignee: Hitachi, Ltd.
    Inventors: Takanori Hisada, Koji Hirata, Masahiko Yatsu
  • Mirror for projector
    Patent number: D639076
    Type: Grant
    Filed: December 2, 2010
    Date of Patent: June 7, 2011
    Assignee: Hitachi Consumer Electronics Co., Ltd.
    Inventors: Masayuki Fukui, Masahiko Yatsu, Naoyuki Ogura, Koji Hirata, Masanori Tsumura
  • Lens for projector
    Patent number: D645068
    Type: Grant
    Filed: December 2, 2010
    Date of Patent: September 13, 2011
    Assignee: Hitachi Consumer Electronics Co., Ltd.
    Inventors: Masayuki Fukui, Masahiko Yatsu, Naoyuki Ogura, Koji Hirata, Masanori Tsumura
  • Lens for projector
    Patent number: D647931
    Type: Grant
    Filed: December 2, 2010
    Date of Patent: November 1, 2011
    Assignee: Hitachi Consumer Electronics Co., Ltd.
    Inventors: Masayuki Fukui, Masahiko Yatsu, Naoyuki Ogura, Koji Hirata, Masanori Tsumura