Patents by Inventor Takahiko Yamamuro

Takahiko Yamamuro 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).

  • Patent number: 10038224
    Abstract: A plurality of required DC voltages are outputted. A power supply device includes: a first switch circuit corresponding to the plurality of battery devices, and that includes a switch for connecting a negative pole terminal, by which negative pole terminals of the battery devices are connected, and a first switch for connecting a positive pole terminal, by which positive pole terminals of the battery devices are connected, and a switch for bypassing, by which the battery devices are bypassed; and a second switch circuit corresponding to the plurality of battery devices, and that includes a second switch for connecting a positive pole terminal, by which positive pole terminals of the battery devices are connected, and a switch for connecting, by which the negative pole terminals of the battery devices are connected to a positive pole terminal of the other battery device.
    Type: Grant
    Filed: January 21, 2016
    Date of Patent: July 31, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventors: Yohei Tan, Tatsuya Kitamura, Takahiko Yamamuro
  • Publication number: 20170373353
    Abstract: A plurality of required DC voltages are outputted. A power supply device includes: a first switch circuit corresponding to the plurality of battery devices, and that includes a switch for connecting a negative pole terminal, by which negative pole terminals of the battery devices are connected, and a first switch for connecting a positive pole terminal, by which positive pole terminals of the battery devices are connected, and a switch for bypassing, by which the battery devices are bypassed; and a second switch circuit corresponding to the plurality of battery devices, and that includes a second switch for connecting a positive pole terminal, by which positive pole terminals of the battery devices are connected, and a switch for connecting, by which the negative pole terminals of the battery devices are connected to a positive pole terminal of the other battery device.
    Type: Application
    Filed: January 21, 2016
    Publication date: December 28, 2017
    Applicant: Mitsubishi Electric Corporation
    Inventors: Yohei TAN, Tatsuya KITAMURA, Takahiko YAMAMURO
  • Patent number: 9571823
    Abstract: A 3D video system is disclosed. The 3D video system includes a frame rate converter that stores an input video signal in a rate conversion frame memory included in the frame rate converter, then reads and outputs the input video signal at a doubled clock rate, a signal format converter that converts a pixel sequence of the video signal output from the frame rate converter and outputs the converted video signal, a controller that outputs a timing signal based on the converted video signal, 3D glasses that transmit light alternately to left and right eyes, and switch the transmission of the light to the left and right eyes, based on the converted video signal and the outputted timing signal, and a spatial modulator that spatially modulates light emitted from a light source, based on the converted video signal. The 3D video system enables the modulated light to be viewed stereoscopically.
    Type: Grant
    Filed: April 21, 2014
    Date of Patent: February 14, 2017
    Assignee: Mitsubishi Electric Corporation
    Inventors: Akihiro Nagase, Takahiko Yamamuro, Kouji Okazaki
  • Patent number: 9235109
    Abstract: A switching power source for driving a light emitting element, a pulse-drive switching element connected in parallel to the light emitting element, a photodetector for detecting an intensity of an output light output from the light emitting element, a current detecting element for detecting a current flowing from the switching power source, and an operation processing unit that controls an operation of the switching power source by performing a feedback loop operation based on a detection result from the photodetector and a feedback loop operation based on a detection result from the current detecting element are provided to stabilize an emission waveform even when the light emitting element is subjected to a pulsed emission.
    Type: Grant
    Filed: October 18, 2010
    Date of Patent: January 12, 2016
    Assignee: Mitsubishi Electric Corporation
    Inventors: Takahiko Yamamuro, Shigeki Harada
  • Patent number: 8817083
    Abstract: An image display apparatus for displaying a 3D video signal using a liquid crystal device such as an HIPS or LCOS device comprises a frame rate converter (3) that converts the input video signal to a doubled frame rate, a signal format converter (4) that converts the pixel sequence of the video signal, a light source controller (7) that outputs a light source control signal for turning the light source used for image display on and off, and a 3D glasses controller (8) that generates a glasses control signal (c3) for shutters (64R, 64L) that switch the transmission of the light to the right and left eyes of 3D glasses (64). The risk of crosstalk between the right and left images, due to device response speed is reduced, without requiring a large number of frame memories.
    Type: Grant
    Filed: September 14, 2012
    Date of Patent: August 26, 2014
    Assignee: Mitsubishi Electric Corporation
    Inventors: Akihiro Nagase, Takahiko Yamamuro, Kouji Okazaki
  • Publication number: 20140225986
    Abstract: A 3D video system is disclosed. The 3D video system includes a frame rate converter that stores an input video signal in a rate conversion frame memory included in the frame rate converter, then reads and outputs the input video signal at a doubled clock rate, a signal format converter that converts a pixel sequence of the video signal output from the frame rate converter and outputs the converted video signal, a controller that outputs a timing signal based on the converted video signal, 3D glasses that transmit light alternately to left and right eyes, and switch the transmission of the light to the left and right eyes, based on the converted video signal and the outputted timing signal, and a spatial modulator that spatially modulates light emitted from a light source, based on the converted video signal. The 3D video system enables the modulated light to be viewed stereoscopicaliy.
    Type: Application
    Filed: April 21, 2014
    Publication date: August 14, 2014
    Applicant: Mitsubishi Electric Corporation
    Inventors: Akihiro NAGASE, Takahiko YAMAMURO, Kouji OKAZAKI
  • Publication number: 20130010091
    Abstract: An image display apparatus for displaying a 3D video signal using a liquid crystal device such as an HIPS or LCOS device comprises a frame rate converter (3) that converts the input video signal to a doubled frame rate, a signal format converter (4) that converts the pixel sequence of the video signal, a light source controller (7) that outputs a light source control signal for turning the light source used for image display on and off, and a 3D glasses controller (8) that generates a glasses control signal (c3) for shutters (64R, 64L) that switch the transmission of the light to the right and left eyes of 3D glasses (64). The risk of crosstalk between the right and left images, due to device response speed is reduced, without requiring a large number of frame memories.
    Type: Application
    Filed: September 14, 2012
    Publication date: January 10, 2013
    Inventors: Akihiro Nagase, Takahiko Yamamuro, Kouji Okazaki
  • Patent number: 8310528
    Abstract: An image display apparatus for displaying a 3D video signal using a liquid crystal device such as an HTPS or LCOS device comprises a frame rate converter (3) that converts the input video signal to a doubled frame rate, a signal format converter (4) that converts the pixel sequence of the video signal, a light source controller (7) that outputs a light source control signal for turning the light source used for image display on and off, and a 3D glasses controller (8) that generates a glasses control signal (c3) for shutters (64R, 64L) that switch the transmission of the light to the right and left eyes of 3D glasses (64). The risk of crosstalk between the right and left images, due to device response speed is reduced, without requiring a large number of frame memories.
    Type: Grant
    Filed: August 6, 2009
    Date of Patent: November 13, 2012
    Assignee: Mitsubishi Electric Corporation
    Inventors: Akihiro Nagase, Takahiko Yamamuro, Kouji Okazaki
  • Publication number: 20120206427
    Abstract: A switching power source for driving a light emitting element, a pulse-drive switching element connected in parallel to the light emitting element, a photodetector for detecting an intensity of an output light output from the light emitting element, a current detecting element for detecting a current flowing from the switching power source, and an operation processing unit that controls an operation of the switching power source by performing a feedback loop operation based on a detection result from the photodetector and a feedback loop operation based on a detection result from the current detecting element are provided to stabilize an emission waveform even when the light emitting element is subjected to a pulsed emission.
    Type: Application
    Filed: October 18, 2010
    Publication date: August 16, 2012
    Inventors: Takahiko Yamamuro, Shigeki Harada
  • Patent number: 8148906
    Abstract: In a constant current switching power supply, the current flowing through the load, is feedback-controlled based on the deviation of the detection value (Id) from the target value (Ir), multiplied by a proportional gain (PG), the value of the gain is set to a predetermined value immediately after the load switching element (5) is turned on, and is thereafter gradually reduced with elapse of time. When the current to the load (4) is supplied by a PWM controlled switching circuit (1), the PWM signal is determined based on a product of the deviation and a proportional gain. It is possible to shorten the rise time of a pulsative load current in a situation where the current is relatively large.
    Type: Grant
    Filed: August 6, 2009
    Date of Patent: April 3, 2012
    Assignee: Mitsubishi Electric Corporation
    Inventors: Takahiko Yamamuro, Akihiro Nagase, Kouji Okazaki
  • Patent number: 8115412
    Abstract: A power converting unit supplies a predetermined current to each of light-emitting elements by controlling a duty ratio of a semiconductor switching element. A light-emitting-element selecting unit sequentially selects a light-emitting element to be supplied with the current from the power converting unit. A duty-ratio control unit controls the duty ratio of the semiconductor switching element based on a value obtained by multiplying a gain by a difference between an output current of the power converting unit and a target current. A gain selecting unit changes the gain according to selected light-emitting element.
    Type: Grant
    Filed: June 22, 2009
    Date of Patent: February 14, 2012
    Assignee: Mitsubishi Electric Corporation
    Inventors: Takahiro Urakabe, Takahiko Yamamuro
  • Publication number: 20100045195
    Abstract: In a constant current switching power supply, the current flowing through the load, is feedback-controlled based on the deviation of the detection value (Id) from the target value (Ir), multiplied by a proportional gain (PG), the value of the gain is set to a predetermined value immediately after the load switching element (5) is turned on, and is thereafter gradually reduced with elapse of time. When the current to the load (4) is supplied by a PWM controlled switching circuit (1), the PWM signal is determined based on a product of the deviation and a proportional gain. It is possible to shorten the rise time of a pulsative load current in a situation where the current is relatively large.
    Type: Application
    Filed: August 6, 2009
    Publication date: February 25, 2010
    Inventors: Takahiko YAMAMURO, Akihiro NAGASE, Kouji OKAZAKI
  • Publication number: 20100045784
    Abstract: An image display apparatus including a display unit having a display panel; an illuminator; a number-of-lines converter for changing each of number of lines in one frame of an image-for-left-eye signal and number of lines in one frame of an image-for-right-eye signal to a reduced number of lines; a timing generator for generating a display timing signal and an illuminating timing signal; a display controller; and an illuminator driver for causing the illuminator to apply light to the display panel at timing synchronized with the display timing signal every one frame; wherein the display unit duplicates an image signal of each line of the image-for-left-eye signal of the reduced number of lines and the image-for-right-eye signal of the reduced number of lines to produce the same plural image signals for plural lines and simultaneously writes the produced signals for plural lines in the display panel to display an image.
    Type: Application
    Filed: July 13, 2009
    Publication date: February 25, 2010
    Inventors: Kouji OKAZAKI, Akihiro Nagase, Takahiko Yamamuro, Shuichi Kagawa, Hiroaki Sugiura
  • Publication number: 20100033555
    Abstract: An image display apparatus for displaying a 3D video signal using a liquid crystal device such as an HTPS or LCOS device comprises a frame rate converter (3) that converts the input video signal to a doubled frame rate, a signal format converter (4) that converts the pixel sequence of the video signal, a light source controller (7) that outputs a light source control signal for turning the light source used for image display on and off, and a 3D glasses controller (8) that generates a glasses control signal (c3) for shutters (64R, 64L) that switch the transmission of the light to the right and left eyes of 3D glasses (64). The risk of crosstalk between the right and left images, due to device response speed is reduced, without requiring a large number of frame memories.
    Type: Application
    Filed: August 6, 2009
    Publication date: February 11, 2010
    Applicant: Mitsubishi Electric Corporation
    Inventors: Akihiro NAGASE, Takahiko Yamamuro, Kouji Okazaki
  • Publication number: 20100007290
    Abstract: A power converting unit supplies a predetermined current to each of light-emitting elements by controlling a duty ratio of a semiconductor switching element. A light-emitting-element selecting unit sequentially selects a light-emitting element to be supplied with the current from the power converting unit. A duty-ratio control unit controls the duty ratio of the semiconductor switching element based on a value obtained by multiplying a gain by a difference between an output current of the power converting unit and a target current. A gain selecting unit changes the gain according to selected light-emitting element.
    Type: Application
    Filed: June 22, 2009
    Publication date: January 14, 2010
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Takahiro URAKABE, Takahiko Yamamuro
  • Publication number: 20080158441
    Abstract: An image display apparatus has a light valve that spatially modulates light emitted by a light source according to a gamma-corrected video signal consisting of successive video fields, by modulating the light pulse widths of individual picture elements in each field. The spatially modulated light is projected onto a screen. A light source driver changes the intensity of the light source as a function of elapsed time in each video field so as to approximately cancel the effect of the gamma correction. Only a slight reverse gamma correction is then needed to produce the correct brightness relationship between the video signal and the projected image. Consequently, fewer gradation levels are lost than in a conventional reverse gamma correction, and the picture quality in low-brightness areas of the projected image is improved.
    Type: Application
    Filed: November 14, 2007
    Publication date: July 3, 2008
    Inventors: Takahiko Yamamuro, Jun Someya, Shuichi Kagawa
  • Publication number: 20080055290
    Abstract: A field sequential color display is obtained by successive display of a sequence of monochrome images of different colors. Monochrome images in at least one of the colors are displayed with light of two different brightness levels, the light of the lower brightness being used to display comparatively low gray levels, the light of both the lower and higher brightness levels being used to display comparatively high gray levels. This scheme provides extra resolution at the low end of the gray scale, and increases the number of displayable gray levels by counteracting the loss of gray levels that occurs due to gamma correction.
    Type: Application
    Filed: July 19, 2007
    Publication date: March 6, 2008
    Inventors: Jun Someya, Shuichi Kagawa, Takahiko Yamamuro, Hiroaki Sugiura
  • Publication number: 20080018807
    Abstract: A field sequential color display is obtained by successive display of a sequence of monochromatic images. Each monochromatic image is displayed with light occupying a different wavelength region, but one of the wavelength regions includes part or all of another one of the wavelength regions. These two wavelength regions are used to display one of the original primary colors of the color image, the included or partially included wavelength region being used for comparatively low gray levels and both wavelength regions being used for comparatively high gray levels. This scheme provides a way to increase the number of gray levels that can be displayed following a gamma correction, as well as broadening the gamut of reproducible colors.
    Type: Application
    Filed: July 5, 2007
    Publication date: January 24, 2008
    Inventors: Jun Someya, Shuichi Kagawa, Takahiko Yamamuro, Hiroaki Sugiura
  • Patent number: 4928173
    Abstract: A picture display device can indicate information of plural still pictures, and comprises an increased unit enclosing plural frame memory boards for inputting and storing the picture signals through a buffer circuit and indicating the pictures onto respective displays connected individually, an image file controller acting as a host controller, and a buffer board connected to the image controller and supplying the picture signals stored in the image file controller to a buffer circuit in the increased unit. Information of different pictures can be transmitted and stored respectively to plural sheets of the frame boards for indication only, thereby the information of respective pictures can be indicated on respective plural displays individually and simultaneously.
    Type: Grant
    Filed: June 22, 1989
    Date of Patent: May 22, 1990
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Takahiko Yamamuro
  • Patent number: 4908610
    Abstract: The invention provides a novel color image display apparatus having a constitution in which a frame memory is provided between a color palette and CRT display, and the frame memory stores color image data restored by the color palette before displaying color image data on the display screen. This constitution allows the apparatus to easily composite and display image information using a variety of palette data. The apparatus is also provided with a plurality of color palettes and image-composition means which composites color images restored by a plurality of color palettes, thus making it possible for the color image display apparatus to securely compose finer color images featuring improved flexibility.
    Type: Grant
    Filed: September 26, 1988
    Date of Patent: March 13, 1990
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Takahiko Yamamuro, Nobuo Fukushima