Patents by Inventor Kazuyuki Tajima

Kazuyuki Tajima 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: 10999659
    Abstract: An optical network device receives an optical signal, to which polarization information is added, from a transmitter via a transmission line. The receiver generates electric-field-information signal of the optical signal. The processor acquires, for respective polarization rotation amounts, the electric-field-information signal during a period specified by the polarization information. The processor calculates, for respective polarization rotation amounts and based on the electric-field-information signal, evaluation values corresponding to powers of the optical signal at a plurality of positions on the transmission line. The processor calculates, for respective positions, variations in the evaluation values corresponding to the polarization rotation amounts.
    Type: Grant
    Filed: July 24, 2020
    Date of Patent: May 4, 2021
    Assignee: FUJITSU LIMITED
    Inventors: Kazuyuki Tajima, Takahito Tanimura, Setsuo Yoshida, Takeshi Hoshida
  • Publication number: 20210092498
    Abstract: An optical network device receives an optical signal, to which polarization information is added, from a transmitter via a transmission line. The receiver generates electric-field-information signal of the optical signal. The processor acquires, for respective polarization rotation amounts, the electric-field-information signal during a period specified by the polarization information. The processor calculates, for respective polarization rotation amounts and based on the electric-field-information signal, evaluation values corresponding to powers of the optical signal at a plurality of positions on the transmission line. The processor calculates, for respective positions, variations in the evaluation values corresponding to the polarization rotation amounts.
    Type: Application
    Filed: July 24, 2020
    Publication date: March 25, 2021
    Applicant: FUJITSU LIMITED
    Inventors: KAZUYUKI TAJIMA, Takahito Tanimura, Setsuo Yoshida, Takeshi Hoshida
  • Patent number: 10951793
    Abstract: An imaging device includes: a modulator configured to modulate the intensity of light, based on a grating pattern; an image sensor configured to convert light passing through the modulator to electrical signals to generate a sensor image; a complex sensor image processing unit configured to generate, from the sensor image, a complex sensor image comprising a complex number; and a data transmission unit configured to transmit the complex sensor image.
    Type: Grant
    Filed: February 19, 2019
    Date of Patent: March 16, 2021
    Assignee: HITACHI, LTD.
    Inventors: Yusuke Nakamura, Kazuyuki Tajima, Keita Yamaguchi
  • Patent number: 10863120
    Abstract: An imaging device includes: a modulator configured to modulate the intensity of light, based on a real pattern; an image sensor configured to convert light passing through the modulator to electrical signals to generate a sensor image; a complex sensor image processing unit configured to generate a complex sensor image including a complex number, from an image obtained by executing predetermined positioning for the sensor image taken through the real pattern; and an image processing unit configured to restore an image, based on an operation with the complex sensor image and data of a pattern for reconstruction.
    Type: Grant
    Filed: March 5, 2019
    Date of Patent: December 8, 2020
    Assignee: HITACHI, LTD.
    Inventors: Chiyo Ohno, Yusuke Nakamura, Kazuyuki Tajima, Koji Yamasaki, Takeshi Shimano
  • Patent number: 10812734
    Abstract: An imaging device includes: an image sensor including a plurality of light-receiving elements, configured to generate a sensor image by photoelectrically converting received light through the light-receiving elements; and a modulating unit configured to modulate the intensity of the light received by the image sensor, through a real pattern provided at a predetermined distance from a light-receiving surface of the image sensor, and the imaging device is characterized in that the width of an aperture of the real pattern provided for the modulating unit is determined, based on the predetermined distance and a two-dimensional size of the image sensor.
    Type: Grant
    Filed: March 1, 2019
    Date of Patent: October 20, 2020
    Assignee: HITACHI, LTD.
    Inventors: Kazuyuki Tajima, Yusuke Nakamura
  • Patent number: 10778904
    Abstract: An imaging device includes: an image sensor including a plurality of light-receiving elements, configured to generate a sensor image by photoelectrically converting received light through the light-receiving elements; and a modulating unit configured to modulate the intensity of the light received by the image sensor, through a real pattern provided at a predetermined distance from a light-receiving surface of the image sensor, and the imaging device is characterized in that the width of an aperture of the real pattern provided for the modulating unit is determined, based on the predetermined distance and a two-dimensional size of the image sensor.
    Type: Grant
    Filed: March 1, 2019
    Date of Patent: September 15, 2020
    Assignee: HITACHI, LTD.
    Inventors: Kazuyuki Tajima, Yusuke Nakamura
  • Patent number: 10659184
    Abstract: An optical transmission device that is provided at a first site includes: an optical transmitter that transmits a first optical signal that includes first ID information to a second site using a first wavelength; and an optical receiver that receives a second optical signal that includes second ID information and that is transmitted using the first wavelength from the second site. When the first ID information matches the second ID information, the optical transmitter transmits a wavelength report that indicates a second wavelength to the second site using the first wavelength. When the optical receiver receives a completion report that indicates the wavelength report has been received at the second site, the optical transmitter transmits an optical signal to the second site using the second wavelength, and the optical receiver ceases to receive an optical signal of the first wavelength from the second site.
    Type: Grant
    Filed: December 19, 2018
    Date of Patent: May 19, 2020
    Assignee: FUJITSU LIMITED
    Inventors: Kazuyuki Tajima, Yutaka Takita, Masatake Miyabe
  • Patent number: 10649118
    Abstract: This imaging device comprises: an image sensor which converts an optical image, captured by pixels arranged in an array on an imaging surface, into an image signal and outputs the image signal; a modulation unit which is provided to a light-receiving surface of the image sensor and modulates the intensity of light; and an image processing unit which carries out image processing on an output image output by the image sensor. The modulation unit has a grating substrate and a first grating pattern formed on a first surface of the grating substrate facing a surface of the image sensor near the light-receiving surface. The grating pattern is configured from a plurality of concentric circles having pitches which are inversely proportional to the distance from the origin point of at least one reference coordinate, the concentric circles do not overlap with each other within the grating pattern.
    Type: Grant
    Filed: May 17, 2017
    Date of Patent: May 12, 2020
    Assignee: Hitachi, Ltd.
    Inventors: Kazuyuki Tajima, Takeshi Shimano, Takeru Utsugi
  • Patent number: 10488561
    Abstract: An imaging device includes: an image sensor that outputs, as an image signal, light received at a light-receiving surface; a phase modulation element provided in close to the light-receiving surface, which has a grating pattern composed of multiple zones arranged in a concentric form to modulate the phase of light passing through the grating pattern toward the surface; and an image processing unit that executes image processing for the image signal output from the sensor. The spacing between the phase modulation element and the image sensor is set so that the duty ratio of the full width at half maximum for a bright section to the width for one period of a projection image of the concentric grating pattern is 0.5 or less in the case of light incidence from a point light source disposed at a distance of a subject in the axial direction of a concentric circle of the grating pattern.
    Type: Grant
    Filed: April 24, 2018
    Date of Patent: November 26, 2019
    Assignee: Hitachi, Ltd.
    Inventors: Takeshi Shimano, Yusuke Nakamura, Kazuyuki Tajima, Mayu Sao
  • Patent number: 10461108
    Abstract: An imaging device includes: a modulator with a first pantoscopic grating pattern, which is configured to modulate light intensity by passage through the first pantoscopic grating pattern; an image sensor configured to convert light passing through the modulator, to image data, and output the image data; and an image processing unit configured to conduct image processing of restoring an image with the use of the image date output from the image sensor, and the imaging device is characterized in that: the first pantoscopic grating pattern is configured to include multiple basic patterns; and each of the basic patterns has the shape of a concentric circle.
    Type: Grant
    Filed: December 8, 2017
    Date of Patent: October 29, 2019
    Assignee: Hitachi, Ltd.
    Inventors: Mayu Sao, Yusuke Nakamura, Kazuyuki Tajima, Takeshi Shimano
  • Publication number: 20190306443
    Abstract: An imaging device includes: a modulator configured to modulate the intensity of light, based on a real pattern; an image sensor configured to convert light passing through the modulator to electrical signals to generate a sensor image; a complex sensor image processing unit configured to generate a complex sensor image including a complex number, from an image obtained by executing predetermined positioning for the sensor image taken through the real pattern; and an image processing unit configured to restore an image, based on an operation with the complex sensor image and data of a pattern for reconstruction.
    Type: Application
    Filed: March 5, 2019
    Publication date: October 3, 2019
    Inventors: Chiyo OHNO, Yusuke NAKAMURA, Kazuyuki TAJIMA, Koji YAMASAKI, Takeshi SHIMANO
  • Publication number: 20190289184
    Abstract: An imaging device includes: an image sensor including a plurality of light-receiving elements, configured to generate a sensor image by photoelectrically converting received light through the light-receiving elements; and a modulating unit configured to modulate the intensity of the light received by the image sensor, through a real pattern provided at a predetermined distance from a light-receiving surface of the image sensor, and the imaging device is characterized in that the width of an aperture of the real pattern provided for the modulating unit is determined, based on the predetermined distance and a two-dimensional size of the image sensor.
    Type: Application
    Filed: March 1, 2019
    Publication date: September 19, 2019
    Inventors: Kazuyuki TAJIMA, Yusuke NAKAMURA
  • Publication number: 20190278006
    Abstract: This imaging device comprises: an image sensor which converts an optical image, captured by pixels arranged in an array on an imaging surface, into an image signal and outputs the image signal; a modulation unit which is provided to a light-receiving surface of the image sensor and modulates the intensity of light; and an image processing unit which carries out image processing on an output image output by the image sensor. The modulation unit has a grating substrate and a first grating pattern formed on a first surface of the grating substrate facing a surface of the image sensor near the light-receiving surface. The grating pattern is configured from a plurality of concentric circles having pitches which are inversely proportional to the distance from the origin point of at least one reference coordinate, the concentric circles do not overlap with each other within the grating pattern.
    Type: Application
    Filed: May 17, 2017
    Publication date: September 12, 2019
    Inventors: Kazuyuki TAJIMA, Takeshi SHIMANO, Takeru UTSUGI
  • Publication number: 20190268507
    Abstract: An imaging device includes: a modulator configured to modulate the intensity of light, based on a grating pattern; an image sensor configured to convert light passing through the modulator to electrical signals to generate a sensor image; a complex sensor image processing unit configured to generate, from the sensor image, a complex sensor image comprising a complex number; and a data transmission unit configured to transmit the complex sensor image.
    Type: Application
    Filed: February 19, 2019
    Publication date: August 29, 2019
    Inventors: Yusuke NAKAMURA, Kazuyuki TAJIMA, Keita YAMAGUCHI
  • Publication number: 20190238250
    Abstract: An optical transmission device that is provided at a first site includes: an optical transmitter that transmits a first optical signal that includes first ID information to a second site using a first wavelength; and an optical receiver that receives a second optical signal that includes second ID information and that is transmitted using the first wavelength from the second site. When the first ID information matches the second ID information, the optical transmitter transmits a wavelength report that indicates a second wavelength to the second site using the first wavelength. When the optical receiver receives a completion report that indicates the wavelength report has been received at the second site, the optical transmitter transmits an optical signal to the second site using the second wavelength, and the optical receiver ceases to receive an optical signal of the first wavelength from the second site.
    Type: Application
    Filed: December 19, 2018
    Publication date: August 1, 2019
    Applicant: FUJITSU LIMITED
    Inventors: KAZUYUKI TAJIMA, Yutaka Takita, MASATAKE MIYABE
  • Patent number: 10341041
    Abstract: A wavelength reallocation assisting method provides information relating to wavelength allocation to optical lines in a wavelength division multiplexing optical network in which a plurality of nodes are connected by optical fibers. The wavelength reallocation assisting method includes: outputting first allocation state information that indicates a sum of bandwidths of respective wavelength slots used by at least one of the optical lines among a plurality of wavelength slots that are available in the wavelength division multiplexing optical network; and outputting second allocation state information that indicates a maximum value of individual used bandwidths obtained with respect to the respective optical fibers, each of the individual used bandwidths indicating a sum of bandwidths of wavelength slots allocated to corresponding optical lines established in a corresponding optical fiber.
    Type: Grant
    Filed: April 14, 2017
    Date of Patent: July 2, 2019
    Assignee: FUJITSU LIMITED
    Inventors: Kazuyuki Tajima, Yutaka Takita, Tomohiro Hashiguchi
  • Publication number: 20190104391
    Abstract: A mobile communication terminal A performs near field communication with another mobile communication terminal B by a near field communication unit and obtains a communication distance with another mobile communication terminal B. An information acquisition unit acquires information on another mobile communication terminal B, information on the mobile communication terminal A, or both of the information when the communication distance to the other mobile communication terminal B is equal to or more than a threshold. An abnormality determination unit determines an abnormal state of the mobile communication terminal A based on information (position information, wearing information, or the like) acquired by the information acquisition unit. When the abnormality determination unit determines that the mobile communication terminal A is in the abnormal state, a lock unit locks the mobile communication terminal A, the other mobile communication terminal B or both of those mobile communication terminals.
    Type: Application
    Filed: May 31, 2016
    Publication date: April 4, 2019
    Inventor: Kazuyuki TAJIMA
  • Publication number: 20180329118
    Abstract: An imaging device includes: an image sensor that outputs, as an image signal, light received at a light-receiving surface; a phase modulation element provided in close to the light-receiving surface, which has a grating pattern composed of multiple zones arranged in a concentric form to modulate the phase of light passing through the grating pattern toward the surface; and an image processing unit that executes image processing for the image signal output from the sensor. The spacing between the phase modulation element and the image sensor is set so that the duty ratio of the full width at half maximum for a bright section to the width for one period of a projection image of the concentric grating pattern is 0.5 or less in the case of light incidence from a point light source disposed at a distance of a subject in the axial direction of a concentric circle of the grating pattern.
    Type: Application
    Filed: April 24, 2018
    Publication date: November 15, 2018
    Inventors: Takeshi Shimano, Yusuke Nakamura, Kazuyuki Tajima, Mayu Sao
  • Patent number: 10027407
    Abstract: A network design device includes a processor. The processor determines a second wavelength allocation based on a first wavelength allocation that indicates a wavelength allocation for a plurality of optical lines established in a wavelength division multiplexing optical network. The processor searches for a disconnection target optical line that is requested to be disconnected in order to realize a transition from the first wavelength allocation to the second wavelength allocation from among the plurality of optical lines. The processor generates procedure information that indicates a procedure of the transition from the first wavelength allocation to the second wavelength allocation based on a difference between the first wavelength allocation and the second wavelength allocation and a searched disconnection target optical line.
    Type: Grant
    Filed: June 7, 2017
    Date of Patent: July 17, 2018
    Assignee: FUJITSU LIMITED
    Inventors: Yutaka Takita, Kazuyuki Tajima, Tomohiro Hashiguchi
  • Publication number: 20180166489
    Abstract: An imaging device includes: a modulator with a first pantoscopic grating pattern, which is configured to modulate light intensity by passage through the first pantoscopic grating pattern; an image sensor configured to convert light passing through the modulator, to image data, and output the image data; and an image processing unit configured to conduct image processing of restoring an image with the use of the image date output from the image sensor, and the imaging device is characterized in that: the first pantoscopic grating pattern is configured to include multiple basic patterns; and each of the basic patterns has the shape of a concentric circle.
    Type: Application
    Filed: December 8, 2017
    Publication date: June 14, 2018
    Inventors: Mayu Sao, Yusuke Nakamura, Kazuyuki Tajima, Takeshi Shimano