Patents by Inventor Naoki Ebiko

Naoki Ebiko 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 method and system utilizing a variable transmittance color switch
    Patent number: 6747708
    Abstract: A single polarizer projector with a color switch and a projection method thereof, wherein the mean luminance of the inputted video signal is calculated so that the transmittance of the color switch can be controlled by the mean luminance in such a fashion that the transmittance is set to a maximum (100%) while setting the same to a low level (50%), thereby preventing unnatural blackening of relatively dark image for improving the contrast ratio.
    Type: Grant
    Filed: May 30, 2001
    Date of Patent: June 8, 2004
    Assignee: Fujitsu General Limited
    Inventors: Takayoshi Taniai, Naoki Ebiko, Atsushi Harayama
  • Reflection type liquid crystal projector
    Patent number: 6628346
    Abstract: The object of the present invention to reduce the cost and the weight of a reflection liquid crystal projector which is designed to project an image formed by synthesizing the R, B and G images produced by the LCD 24 for R, the LCD 28 for B and the LCD for G on a screen through a projector, and containing a polarized light conversion element 12 for converting the white light outputted from the light source 10, to an S-polarized light, a color separation element 40 for separating the R, B and G lights from the S-polarized light, converting the G light to a P-polarized light, setting the directions of R light, B light and G light orthogonal to one another and setting the directions of the B and G lights in the same direction, a first PBS 52 for reflecting the R light outputted from a color separation element 40, to fall on a LCD 24 for R to be reflected and outputted thereby, a second PBS 54 for reflecting the B light outputted from the color separation element 40, so as to fall on a LCD 28 for B, for transmitt
    Type: Grant
    Filed: May 15, 2001
    Date of Patent: September 30, 2003
    Assignee: Fujitsu General Limited
    Inventor: Naoki Ebiko
  • Reflector for a projection light source
    Patent number: 6585397
    Abstract: The object of the present invention is to effectively utilize the light rays emitted from a light source lamp 1, and, for accomplishing this object, a reflector 2 is made up of a first parabolic reflector 3 designed for reflecting light rays coming from the light source lamp 1 to be outputted as light rays parallel to the optical axis 6, second parabolic reflector 4 designed for reflecting light rays coming from the light source lamp 1 as outwardly inclined parallel light rays, and circular truncated conic reflector 5 for reflecting light rays coming from the second parabolic reflector 4 and outputted as light rays parallel to the optical axis 6. In this fashion, light rays which cannot be outputted due to being in the shadow of the spherical light source lamp can be outputted as light rays parallel to the optical axis 6.
    Type: Grant
    Filed: August 16, 2001
    Date of Patent: July 1, 2003
    Assignee: Fujitsu General Limited
    Inventor: Naoki Ebiko
  • Projection method and projector
    Publication number: 20010052947
    Abstract: A single polarizer projector with a color switch and a projection method thereof, wherein the mean luminance of the inputted video signal is calculated so that the transmittance of the color switch can be controlled by the mean luminance in such a fashion that the transmittance is set to a maximum (100%) while setting the same to a low level (50%), thereby preventing unnatural blackening of relatively dark image for improving the contrast ratio.
    Type: Application
    Filed: May 30, 2001
    Publication date: December 20, 2001
    Inventors: Takayoshi Taniai, Naoki Ebiko, Atsushi Harayama