Patents by Inventor Kazuo Shikita

Kazuo Shikita 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).

  • Publication number: 20190191132
    Abstract: A projection video display apparatus includes an input unit to input a video signal; a display to display the inputted video signal; a plurality of light sources to generate light; an illumination optical system to guide the generated light to the display; a projection optical system to project light via the display; and a controller to control the light sources, a lighting ratio and a current value per time for each light source. The controller has a black display control mode, for each light source, which makes a relative rate of a lighting ratio for a light source with a specific color smaller than the other light sources, and reduces the current value of the other light sources to be less than a current value of the light source with the specific color when compared with a case where the input video signal is a white signal.
    Type: Application
    Filed: August 5, 2016
    Publication date: June 20, 2019
    Applicant: MAXELL, LTD.
    Inventors: Shuhei KOBAYASHI, Kazuo SHIKITA, Akihiro SHIRAISHI, Naoya OKA
  • Patent number: 10313646
    Abstract: A projection-type video image display apparatus measures quantity of light of a plurality of light sources by maintaining illuminance distribution of an illumination luminous flux. The apparatus includes R, B and G light sources, and a mirror configured to reflect white light obtained by synthesizing the light rays emitted from the respective light sources while making the white light pass through the mirror based on predetermined transmittance characteristics. An illuminance sensor disposed on the mirror's back surface and configured to measure quantity of light for each color of the white light which passed through the mirror, and a controller adjusts an amount of light emission of the light source of each color based on the quantity of light measured. The mirror allows the transmittance characteristics of each light transmittance in the center wavelengths of the R and B lights sources to be larger than those of the G light source.
    Type: Grant
    Filed: October 25, 2016
    Date of Patent: June 4, 2019
    Assignee: Maxell, Ltd.
    Inventors: Akihiro Shiraishi, Kazuo Shikita
  • Patent number: 10295895
    Abstract: The purpose of the present invention is to provide a projection type image display apparatus which is simple in configuration, low in price, and improved in reliability and brightness of an illumination light source. The present invention is a projection type image display apparatus provided with: a lamp; a reflector that reflects a light flux emitted from the lamp; a collimating lens that collimates the light reflected by the reflector; a light modulation device that modulates the collimated light to output the modulated light; and a projection lens that projects the modulated light. The reflector is configured to prevent the lamp from being irradiated with the reflected light of the light flux emitted from the lamp, and the collimating lens is formed of one biconcave lens having concave surfaces on both the incident side and the exit side.
    Type: Grant
    Filed: October 22, 2015
    Date of Patent: May 21, 2019
    Assignee: MAXELL, LTD.
    Inventors: Shuichi Sakamoto, Kazuo Shikita, Hiroyuki Nakamura
  • Publication number: 20190041731
    Abstract: In a projection-type image display apparatus configured to project images formed on a display element by using light from a plurality of light sources, the apparatus includes light-source coolers provided to the light sources and configured to cool the light sources, and the light-source coolers are arranged so that light-source heat dissipating directions of all the light-source coolers are substantially the same among the light-source coolers the light-source heat dissipating directions being directed toward heat dissipating parts dissipating the heat of the light sources with reference to heat absorbing parts absorbing the heat of the light sources.
    Type: Application
    Filed: September 23, 2016
    Publication date: February 7, 2019
    Applicant: MAXELL, LTD.
    Inventors: Takeshi KATAYAMA, Kazuo SHIKITA, Akihiro SHIRAISHI, Tatsuya INO, Hiroyuki INOUE
  • Publication number: 20190028680
    Abstract: A projection-type video image display apparatus measures quantity of light of a plurality of light sources by maintaining illuminance distribution of an illumination luminous flux. The apparatus includes R, B and G light sources, and a mirror configured to reflect white light obtained by synthesizing the light rays emitted from the respective light sources while making the white light pass through the mirror based on predetermined transmittance characteristics. An illuminance sensor disposed on the mirror's back surface and configured to measure quantity of light for each color of the white light which passed through the mirror, and a controller adjusts an amount of light emission of the light source of each color based on the quantity of light measured. The mirror allows the transmittance characteristics of each light transmittance in the center wavelengths of the R and B lights sources to be larger than those of the G light source.
    Type: Application
    Filed: October 25, 2016
    Publication date: January 24, 2019
    Applicant: MAXELL, LTD.
    Inventors: Akihiro SHIRAISHI, Kazuo SHIKITA
  • Publication number: 20180314143
    Abstract: The purpose of the present invention is to provide a projection type image display apparatus which is simple in configuration, low in price, and improved in reliability and brightness of an illumination light source. The present invention is a projection type image display apparatus provided with: a lamp; a reflector that reflects a light flux emitted from the lamp; a collimating lens that collimates the light reflected by the reflector; a light modulation device that modulates the collimated light to output the modulated light; and a projection lens that projects the modulated light. The reflector is configured to prevent the lamp from being irradiated with the reflected light of the light flux emitted from the lamp, and the collimating lens is formed of one biconcave lens having concave surfaces on both the incident side and the exit side.
    Type: Application
    Filed: October 22, 2015
    Publication date: November 1, 2018
    Applicant: MAXELL, LTD.
    Inventors: Shuichi SAKAMOTO, Kazuo SHIKITA, Hiroyuki NAKAMURA
  • Publication number: 20180217351
    Abstract: A projection type image display device includes a focus adjusting unit that adjusts a focal position of a projection lens. The projection lens includes a front side lens group and a rear side lens group which are displaceable toward the screen. The focus adjusting unit includes a back focus adjusting unit that adjusts a position of the rear side lens group and a peripheral adjusting unit that adjusts a position of the front side lens group, and the back focus adjusting unit and the peripheral adjusting unit independently adjust the position of the rear side lens group and the position of the front side lens group by individual driving of motors.
    Type: Application
    Filed: November 14, 2014
    Publication date: August 2, 2018
    Applicant: Hitachi Maxell, Ltd.
    Inventors: Akihiro SHIRAISHI, Kazuo SHIKITA, Satoshi NAKAYAMA
  • Patent number: 9335618
    Abstract: A projection image display apparatus capable of maintaining the positional accuracy of an integrator optical system even when subjected to an external force is provided.
    Type: Grant
    Filed: November 7, 2011
    Date of Patent: May 10, 2016
    Assignee: HITACHI MAXELL, LTD.
    Inventors: Kazumasa Ueoka, Shinro Inui, Kei Adachi, Chohei Ono, Takafumi Ishizu, Kazuo Shikita
  • Publication number: 20140293238
    Abstract: A projection image display apparatus capable of maintaining the positional accuracy of an integrator optical system even when subjected to an external force is provided.
    Type: Application
    Filed: November 7, 2011
    Publication date: October 2, 2014
    Inventors: Kazumasa Ueoka, Shiro Inui, Kei Adachi, Chohei Ono, Takafumi Ishizu, Kazuo Shikita
  • Patent number: 8625082
    Abstract: A display apparatus is provided which, when projecting a video onto a curved surface of an object for display, can realize an undistorted display of the video. The measuring means outputs the distance information representing the distance to the object. Based on the distance information produced by the measuring means, the curved surface contour is detected with high precision. According to at least the detected curved surface contour distortions, pixels of the display image are unevenly rearranged to correct the video information before it is output. This arrangement realizes an undistorted display of video when the video is projected onto the curved surface of the object.
    Type: Grant
    Filed: September 6, 2012
    Date of Patent: January 7, 2014
    Assignee: Hitachi Consumer Electronics Co., Ltd.
    Inventors: Tomoki Kobori, Satoshi Ouchi, Koji Hirata, Hidehiro Ikeda, Kazuo Shikita
  • Publication number: 20120327391
    Abstract: A display apparatus is provided which, when projecting a video onto a curved surface of an object for display, can realize an undistorted display of the video. The measuring means outputs the distance information representing the distance to the object. Based on the distance information produced by the measuring means, the curved surface contour is detected with high precision. According to at least the detected curved surface contour distortions, pixels of the display image are unevenly rearranged to correct the video information before it is output. This arrangement realizes an undistorted display of video when the video is projected onto the curved surface of the object.
    Type: Application
    Filed: September 6, 2012
    Publication date: December 27, 2012
    Inventors: Tomoki Kobori, Satoshi Ouchi, Koji Hirata, Hidehiro Ikeda, Kazuo Shikita
  • Patent number: 8287136
    Abstract: A display apparatus is provided which, when projecting a video onto a curved surface of an object for display, can realize an undistorted display of the video. The measuring means outputs the distance information representing the distance to the object. Based on the distance information produced by the measuring means, the curved surface contour is detected with high precision. According to at least the detected curved surface contour distortions, pixels of the display image are unevenly rearranged to correct the video information before it is output. This arrangement realizes an undistorted display of video when the video is projected onto the curved surface of the object.
    Type: Grant
    Filed: April 20, 2009
    Date of Patent: October 16, 2012
    Assignee: Hitachi, Ltd.
    Inventors: Tomoki Kobori, Satoshi Ouchi, Koji Hirata, Hidehiro Ikeda, Kazuo Shikita
  • Patent number: 8210687
    Abstract: For enabling to prevent ill effects from being generated in the structures of a reflection mirror, even if increasing an output energy from a light source, thereby preventing ill influences from being exerted on the driving condition thereof, a mirror drive controller unit 7 reads out history data of the past, relating to temperature changes on a micro mirror 1, from a first LUT holder unit 19. Upon basis of the read-out history data of the past is presumed the temperature on the micro mirror 1 at the present time. The presumed temperature on the micro mirror 1 is temperature P temp of the micro mirror 1 at the present time, and upon that P temp are changed vibration (or oscillation) condition of the micro mirror 1 in the horizontal (H) direction and vibration (or oscillation) condition thereof in the vertical (V) direction.
    Type: Grant
    Filed: July 14, 2011
    Date of Patent: July 3, 2012
    Assignee: Hitachi, Ltd.
    Inventors: Tomoki Kobori, Satoshi Ouchi, Koji Hirata, Hidehiro Ikeda, Seiji Murata, Kazuo Shikita
  • Publication number: 20110273629
    Abstract: For enabling to prevent ill effects from being generated in the structures of a reflection mirror, even if increasing an output energy from a light source, thereby preventing ill influences from being exerted on the driving condition thereof, a mirror drive controller unit 7 reads out history data of the past, relating to temperature changes on a micro mirror 1, from a first LUT holder unit 19. Upon basis of the read-out history data of the past is presumed the temperature on the micro mirror 1 at the present time. The presumed temperature on the micro mirror 1 is temperature P temp of the micro mirror 1 at the present time, and upon that P temp are changed vibration (or oscillation) condition of the micro mirror 1 in the horizontal (H) direction and vibration (or oscillation) condition thereof in the vertical (V) direction.
    Type: Application
    Filed: July 14, 2011
    Publication date: November 10, 2011
    Inventors: Tomoki Kobori, Satoshi Ouchi, Koji Hirata, Hidehiro Ikeda, Seiji Murata, Kazuo Shikita
  • Patent number: 8002414
    Abstract: For enabling to prevent ill effects from being generated in the structures of a reflection mirror, even if increasing an output energy from a light source, thereby preventing ill influences from being exerted on the driving condition thereof, a mirror drive controller unit 7 reads out history data of the past, relating to temperature changes on a micro mirror 1, from a first LUT holder unit 19. Upon basis of the read-out history data of the past is presumed the temperature on the micro mirror 1 at the present time. The presumed temperature on the micro mirror 1 is temperature P temp of the micro mirror 1 at the present time, and upon that P temp are changed vibration (or oscillation) condition of the micro mirror 1 in the horizontal (H) direction and vibration (or oscillation) condition thereof in the vertical (V) direction.
    Type: Grant
    Filed: July 9, 2008
    Date of Patent: August 23, 2011
    Assignee: Hitachi, Ltd.
    Inventors: Tomoki Kobori, Satoshi Ouchi, Koji Hirata, Hidehiro Ikeda, Seiji Murata, Kazuo Shikita
  • Patent number: 7787167
    Abstract: In a method for driving a micro mirror such as MEMS mirror and a display apparatus using the method, there are provided a mirror driving unit for driving the micro mirror which operates in a resonant mode and a nonresonant mode, a driving-condition setting unit for setting a mirror driving condition, a switching unit for switching on/off a mirror driving signal in the nonresonant mode, and a look-up table for indicating the relationship of a mirror response with respect to the driving condition already known in advance. The switching unit controls the transmission of the nonresonant-mode mirror driving signal while grasping the mirror response state with respect to the mirror driving signal, thereby finely increasing and decreasing a driving torque for the micro mirror. This fine increase and decrease allows the micro mirror to be fluctuated stably, and a further enhancement in the fluctuation rate.
    Type: Grant
    Filed: February 9, 2009
    Date of Patent: August 31, 2010
    Assignee: Hitachi, Ltd.
    Inventors: Tomoki Kobori, Satoshi Ouchi, Koji Hirata, Hidehiro Ikeda, Kazuo Shikita
  • Publication number: 20100079683
    Abstract: A display apparatus is provided which, when projecting a video onto a curved surface of an object for display, can realize an undistorted display of the video. The measuring means outputs the distance information representing the distance to the object. Based on the distance information produced by the measuring means, the curved surface contour is detected with high precision. According to at least the detected curved surface contour distortions, pixels of the display image are unevenly rearranged to correct the video information before it is output. This arrangement realizes an undistorted display of video when the video is projected onto the curved surface of the object.
    Type: Application
    Filed: April 20, 2009
    Publication date: April 1, 2010
    Inventors: Tomoki Kobori, Satoshi Ouchi, Koji Hirata, Hidehiro Ikeda, Kazuo Shikita
  • Publication number: 20090237627
    Abstract: In a method for driving a micro mirror such as MEMS mirror and a display apparatus using the method, there are provided a mirror driving unit for driving the micro mirror which operates in a resonant mode and a nonresonant mode, a driving-condition setting unit for setting a mirror driving condition, a switching unit for switching on/off a mirror driving signal in the nonresonant mode, and a look-up table for indicating the relationship of a mirror response with respect to the driving condition already known in advance. The switching unit controls the transmission of the nonresonant-mode mirror driving signal while grasping the mirror response state with respect to the mirror driving signal, thereby finely increasing and decreasing a driving torque for the micro mirror. This fine increase and decrease allows the micro mirror to be fluctuated stably, and a further enhancement in the fluctuation rate.
    Type: Application
    Filed: February 9, 2009
    Publication date: September 24, 2009
    Applicant: Hitachi, Ltd.
    Inventors: Tomoki KOBORI, Satoshi Ouchi, Koji Hirata, Hidehiro Ikeda, Kazuo Shikita
  • Publication number: 20090160736
    Abstract: A HUD apparatus for vehicles including a light source, a scanning unit for scanning light from the light source two-dimensionally, a screen to focus the scanned light on, and a projection unit for projecting the image on the screen. The apparatus further includes a moving mechanism for changing the position of the screen.
    Type: Application
    Filed: November 7, 2008
    Publication date: June 25, 2009
    Inventor: Kazuo SHIKITA
  • Publication number: 20090059179
    Abstract: For enabling to prevent ill effects from being generated in the structures of a reflection mirror, even if increasing an output energy from a light source, thereby preventing ill influences from being exerted on the driving condition thereof, a mirror drive controller unit 7 reads out history data of the past, relating to temperature changes on a micro mirror 1, from a first LUT holder unit 19. Upon basis of the read-out history data of the past is presumed the temperature on the micro mirror 1 at the present time. The presumed temperature on the micro mirror 1 is temperature P temp of the micro mirror 1 at the present time, and upon that P temp are changed vibration (or oscillation) condition of the micro mirror 1 in the horizontal (H) direction and vibration (or oscillation) condition thereof in the vertical (V) direction.
    Type: Application
    Filed: July 9, 2008
    Publication date: March 5, 2009
    Inventors: Tomoki KOBORI, Satoshi Ouchi, Koji Hirata, Hidehiro Ikeda, Seiji Murata, Kazuo Shikita