Patents by Inventor Akira Masuda

Akira Masuda 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: 20240160052
    Abstract: A viewing angle-controlling liquid crystal panel sequentially includes a first polarizing plate; a first liquid crystal panel; a second polarizing plate; a second liquid crystal panel; and a third polarizing plate, wherein an azimuthal angle ?P1 of the absorption axis of the first polarizing plate, an azimuthal angle ?1 of a director of liquid crystal molecules near the first substrate and an azimuthal angle ?2 of a director of liquid crystal molecules near the second substrate in the first liquid crystal panel, an azimuthal angle ?P2 of the absorption axis of the second polarizing plate, an azimuthal angle ?3 of a director of liquid crystal molecules near the third substrate and an azimuthal angle ?4 of a director of liquid crystal molecules near the fourth substrate in the second liquid crystal panel, and an azimuthal angle ?P3 of the absorption axis of the third polarizing plate satisfy specific formulas.
    Type: Application
    Filed: October 12, 2023
    Publication date: May 16, 2024
    Applicant: Sharp Display Technology Corporation
    Inventors: Koji MURATA, Junichi MASUDA, Shugo YAGI, Akira HIRAI, Hiroshi TSUCHIYA, Takashi SATOH, Akira SAKAI, Kiyoshi MINOURA
  • Publication number: 20240137673
    Abstract: Provided is a path switching device including a wavelength separator that wavelength-separates signal light and monitoring light having a wavelength different from a wavelength of the signal light, a signal light path switcher that switches a path of the signal light, and a monitoring light path controller that controls a path of the monitoring light, wherein the monitoring light path controller sets a path of the monitoring light to one path regardless of a switching state of a path of the signal light.
    Type: Application
    Filed: October 10, 2023
    Publication date: April 25, 2024
    Applicant: NEC Corporation
    Inventor: Akira MASUDA
  • Patent number: 11936423
    Abstract: A fault detection apparatus includes: a transmitter that transmits a first optical signal through an optical transmission line; a receiver that receives, in response to the transmission of the first optical signal, a second optical signal from the line, and measures the reception level of the second optical signal; and a control unit that specifies a section where the second optical signal corresponding to the first optical signal was generated, calculates an optical level corresponding to a loss in said section on the basis of the reception level, determines that a first fault has occurred in the section when the optical level in the section has changed from a first reference level by a first threshold or more, sets a second reference level and a second threshold after occurrence of the first fault, and determines occurrence of a second fault.
    Type: Grant
    Filed: February 5, 2021
    Date of Patent: March 19, 2024
    Assignee: NEC CORPORATION
    Inventor: Akira Masuda
  • Patent number: 11924985
    Abstract: A display device includes a display panel that includes a first hole and a device housing that is configured such that the display panel is fastened and fixed to the device housing by a screw passed through the first hole and screwed into the screw hole. The display panel includes a display-side positioning part which is configured to fit to a portion of the device housing to perform positioning of the display panel with respect to the device housing and which includes the first hole, and the device housing includes a housing-side positioning part which is configured to fit to the display-side positioning part to perform the positioning and which includes a second hole formed so as to communicate with the first hole when the housing-side positioning part is fitted to the display-side positioning part.
    Type: Grant
    Filed: October 6, 2022
    Date of Patent: March 5, 2024
    Assignee: YAZAKI CORPORATION
    Inventors: Junichi Ikumi, Masaaki Sano, Naoki Ueno, Akira Masuda, Takahiro Shimada, Takeshi Iwamoto, Shota Kosuga, Ryuta Suzuki, Satoru Kanazawa, Junnosuke Nishimura
  • Publication number: 20240063899
    Abstract: In order to provide an optical path identification device and the like whereby it is possible to identify a switched optical path without incorporating a transceiver mechanism into an optical path switching device, this optical path identification device is provided with: an optical path identification unit that identifies whether a connected optical path connected to a first optical path is any of a plurality of optical paths from return light information regarding inspection light transmitted to the first optical path and representing the change in intensity over time of return light from the connected optical path; and an output unit for outputting the identification result.
    Type: Application
    Filed: January 13, 2022
    Publication date: February 22, 2024
    Applicant: NEC Corporation
    Inventor: Akira MASUDA
  • Patent number: 11817905
    Abstract: An object is to provide an optical transceiver in which two single-core bidirectional optical communication devices are mounted on a single substrate. A first substrate includes an electric connector connected to an optical transmission apparatus, and a signal processing circuit processing electric signals that are input to and output from first and second optical transceiver modules. Components outputting a control signal to the signal processing circuit is mountd on a second substrate. A flexible printed circuit connects the first substrate to the first and second optical transceiver modules.
    Type: Grant
    Filed: November 6, 2019
    Date of Patent: November 14, 2023
    Assignee: NEC CORPORATION
    Inventor: Akira Masuda
  • Patent number: 11706065
    Abstract: A device generates a symbol sequence by performing adaptive equalization by an estimation inverse transfer function of a transmission line on a reception signal sequence extracted from the transmission line, and performing provisional determination on the symbol sequence generated; generates a plurality of the symbol sequences indicating transmission line states in a range of a provisional determination symbol provisionally determined and nearby symbols of the provisional determination symbol; generates, based on the plurality of the symbol sequences indicating the transmission line states generated and an estimation transfer function of the transmission line, an estimation reception symbol sequence for each of the transmission line states; calculates a metric between the symbol sequence obtained from the reception signal sequence and each of a plurality of the estimation reception symbol sequences; selects a most likelihood estimation reception symbol sequence of the plurality of the estimation reception sym
    Type: Grant
    Filed: May 8, 2020
    Date of Patent: July 18, 2023
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Hiroki Taniguchi, Masanori Nakamura, Shuto Yamamoto, Akira Masuda, Yoshiaki Kisaka
  • Publication number: 20230112001
    Abstract: A display device includes a display panel that includes a first hole and a device housing that is configured such that the display panel is fastened and fixed to the device housing by a screw passed through the first hole and screwed into the screw hole. The display panel includes a display-side positioning part which is configured to fit to a portion of the device housing to perform positioning of the display panel with respect to the device housing and which includes the first hole, and the device housing includes a housing-side positioning part which is configured to fit to the display-side positioning part to perform the positioning and which includes a second hole formed so as to communicate with the first hole when the housing-side positioning part is fitted to the display-side positioning part.
    Type: Application
    Filed: October 6, 2022
    Publication date: April 13, 2023
    Applicant: Yazaki Corporation
    Inventors: Junichi IKUMI, Masaaki Sano, Naoki Ueno, Akira Masuda, Takahiro Shimada, Takeshi Iwamoto, Shota Kosuga, Ryuta Suzuki, Satoru Kanazawa, Junnosuke Nishimura
  • Publication number: 20230116821
    Abstract: A display device includes a display panel in which a display screen and an indicator region are two-dimensionally arranged, an indicator substrate which is mounted with a light source component and which is arranged on a back face side of the display panel so as to face the indicator region but not to face the display screen, and a control substrate which is a separate part from the indicator substrate and on which a control circuit for the display screen is formed. The control substrate is arranged on the back face side of the display panel and arranged distant from the display panel than the indicator substrate, and the control substrate is arranged so as not to face at least a portion of each of the display screen and the indicator substrate.
    Type: Application
    Filed: October 7, 2022
    Publication date: April 13, 2023
    Applicant: Yazaki Corporation
    Inventors: Junichi IKUMI, Masaaki SANO, Naoki UENO, Akira MASUDA, Takahiro SHIMADA, Takeshi IWAMOTO, Shota KOSUGA, Ryuta SUZUKI, Satoru KANAZAWA, Junnosuke NISHIMURA
  • Publication number: 20230111962
    Abstract: A display device includes a device housing that is configured to be installed such that an occulted portion including a portion of a peripheral wall of the device housing is hidden from an observer of a display screen, and a slide attaching part that is moved to slide in a sliding direction from a non-occulted portion to the occulted portion and attached so as to cover a back side of the device housing. A slide receiving part including the device housing includes a fixed part provided at the occulted portion and an engaged part provided at the non-occulted portion, and the slide attaching part includes a fixing part provided at a portion corresponding to the occulted portion and configured to be fixed to the fixed part, and an engaging part provided at a portion corresponding to the non-occulted portion and configured to be engaged with the engaged part.
    Type: Application
    Filed: October 7, 2022
    Publication date: April 13, 2023
    Applicant: YAZAKI CORPORATION
    Inventors: Junichi IKUMI, Masaaki SANO, Naoki UENO, Akira MASUDA, Takahiro SHIMADA, Takeshi IWAMOTO, Shota KOSUGA, Ryuta SUZUKI, Satoru KANAZAWA, Junnosuke NISHIMURA
  • Patent number: 11606467
    Abstract: An information processing apparatus includes circuitry. The circuitry is configured to acquire read image data of an image formed on a recording medium. The circuitry is configured to acquire output target image data according to which the image is formed. The circuitry is configured to generate, based on the output target image data, inspection image data for inspection of the read image data. The circuitry is configured to compare the read image data corrected based on an amount of deviation caused by conveyance of the recording medium with the inspection image data generated, to detect an image abnormality. The circuitry is configured to highlight and output a position of a portion of the image abnormality in the read image data before correction, based on the amount of deviation caused by conveyance of the recording medium, in response to the image abnormality being detected.
    Type: Grant
    Filed: July 23, 2021
    Date of Patent: March 14, 2023
    Assignee: RICOH COMPANY, LTD.
    Inventors: Yohta Mashiko, Tadashi Kitai, Akira Masuda, Takahiro Koyama, Kengo Yamamoto
  • Publication number: 20230060104
    Abstract: A fault detection apparatus includes: a transmitter that transmits a first optical signal through an optical transmission line; a receiver that receives, in response to the transmission of the first optical signal, a second optical signal from the line, and measures the reception level of the second optical signal; and a control unit that specifies a section where the second optical signal corresponding to the first optical signal was generated, calculates an optical level corresponding to a loss in said section on the basis of the reception level, determines that a first fault has occurred in the section when the optical level in the section has changed from a first reference level by a first threshold or more, sets a second reference level and a second threshold after occurrence of the first fault, and determines occurrence of a second fault.
    Type: Application
    Filed: February 5, 2021
    Publication date: February 23, 2023
    Applicant: NEC Corporation
    Inventor: Akira MASUDA
  • Patent number: 11581944
    Abstract: An optical transmission system including an optical transmitter and an optical receiver, wherein the optical transmitter includes a signal coding unit that performs non-linear block coding on an M (M is an integer greater than or equal to 1)-value symbol sequence or a bit sequence input as data information to generate an L (L is an integer greater than or equal to 2, L>M)-value symbol sequence that corresponds to the M-value symbol sequence or the bit sequence in one-to-one correspondence, a digital-to-analog conversion unit that converts the generated L-value symbol sequence to an analog signal, and a modulator that generates an optical modulation signal by performing modulation based on the analog signal, and the optical receiver includes a light receiving unit that receives the optical modulation signal transmitted from the optical transmitter and converts the optical modulation signal to an electrical signal, and a signal decoding unit that restores the M-value symbol sequence or the bit sequence by pe
    Type: Grant
    Filed: November 7, 2019
    Date of Patent: February 14, 2023
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Shuto Yamamoto, Seiji Okamoto, Akira Masuda, Hiroki Taniguchi, Yoshiaki Kisaka
  • Patent number: 11444694
    Abstract: Provided is an optical transmission system that includes an optical transmitter, and an optical receiver. The optical transmitter includes: a signal coding unit configured to perform nonlinear trellis coding, which corresponds to nonlinear calculation, on a symbol sequence; and a modulator configured to modulate the symbol sequence subjected to the nonlinear trellis coding by the signal coding unit, and transmit the modulated symbol sequence to the optical receiver. The optical receiver includes: a light receiving unit configured to receive an optical signal transmitted from the optical transmitter, and convert the received optical signal into an electrical signal; and a digital signal processing unit configured to perform digital signal processing on the electrical signal to reconstruct the symbol sequence.
    Type: Grant
    Filed: November 6, 2019
    Date of Patent: September 13, 2022
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Shuto Yamamoto, Akira Masuda, Hiroki Taniguchi, Yoshiaki Kisaka
  • Patent number: 11444699
    Abstract: There are provided an optical transmission apparatus that subjects a transmission signal including a plurality of sequences to Hadamard transform to obtain a signal in which a predetermined delay is added to one of the sequences, optically modulates the obtained signal, and transmits the modulated signal, and an optical reception apparatus that demodulates a reception signal received from the optical transmission apparatus by subjecting the reception signal to adaptive equalization processing with a predetermined number of taps.
    Type: Grant
    Filed: January 15, 2020
    Date of Patent: September 13, 2022
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Akira Masuda, Fukutaro Hamaoka, Shuto Yamamoto, Seiji Okamoto, Kengo Horikoshi, Masanori Nakamura, Asuka Matsushita, Yoshiaki Kisaka
  • Publication number: 20220224575
    Abstract: A device generates a symbol sequence by performing adaptive equalization by an estimation inverse transfer function of a transmission line on a reception signal sequence extracted from the transmission line, and performing provisional determination on the symbol sequence generated; generates a plurality of the symbol sequences indicating transmission line states in a range of a provisional determination symbol provisionally determined and nearby symbols of the provisional determination symbol; generates, based on the plurality of the symbol sequences indicating the transmission line states generated and an estimation transfer function of the transmission line, an estimation reception symbol sequence for each of the transmission line states; calculates a metric between the symbol sequence obtained from the reception signal sequence and each of a plurality of the estimation reception symbol sequences; selects a most likelihood estimation reception symbol sequence of the plurality of the estimation reception sym
    Type: Application
    Filed: May 8, 2020
    Publication date: July 14, 2022
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Hiroki TANIGUCHI, Masanori NAKAMURA, Shuto YAMAMOTO, Akira MASUDA, Yoshiaki KISAKA
  • Patent number: 11349524
    Abstract: A symbol-determining device according to an embodiment includes: a transmission line shortening unit that multiplies each symbol value of a symbol array that is part of an input signal by a tap gain of a linear digital filter and outputs a symbol array representing a sum of values acquired through the multiplication; a transmission line estimating unit that estimates a transfer function of a transmission line using an adaptive nonlinear digital filter on the basis of a symbol array representing a state of the transmission line; an addition comparison processing unit that calculates a minimum value of a distance function in a Viterbi algorithm on the basis of a metric that is calculated on the basis of the output of the transmission line shortening unit and the transfer function; and a path tracing-back determination unit that performs symbol determination by tracing back a trellis path in the Viterbi algorithm on the basis of the minimum value of the distance function.
    Type: Grant
    Filed: January 18, 2019
    Date of Patent: May 31, 2022
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Hiroki Taniguchi, Shuto Yamamoto, Akira Masuda, Mitsunori Fukutoku
  • Patent number: 11283528
    Abstract: A digital coherent receiver includes: an adaptive equalizer configured to execute, using a first tap coefficient, adaptive equalization processing on a digital signal that corresponds to a signal; a first coefficient updating unit configured to update the first tap coefficient based on the digital signal on which the adaptive equalization processing has not been executed, the digital signal on which the adaptive equalization processing has been executed, and a first step size; a second coefficient updating unit configured to update a second tap coefficient based on the digital signal on which the adaptive equalization processing has not been executed, the digital signal on which the adaptive equalization processing has been executed, and a second step size; and a control unit configured to detect a fluctuation speed of a state of polarization of the digital signal based on the second tap coefficient, and change the first tap coefficient to the updated second tap coefficient if it is determined that the fluctu
    Type: Grant
    Filed: August 27, 2019
    Date of Patent: March 22, 2022
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Akira Masuda, Seiji Okamoto, Shuto Yamamoto, Fukutaro Hamaoka, Masanori Nakamura, Asuka Matsushita, Yoshiaki Kisaka
  • Publication number: 20220069921
    Abstract: There are provided an optical transmission apparatus that subjects a transmission signal including a plurality of sequences to Hadamard transform to obtain a signal in which a predetermined delay is added to one of the sequences, optically modulates the obtained signal, and transmits the modulated signal, and an optical reception apparatus that demodulates a reception signal received from the optical transmission apparatus by subjecting the reception signal to adaptive equalization processing with a predetermined number of taps.
    Type: Application
    Filed: January 15, 2020
    Publication date: March 3, 2022
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Akira MASUDA, Fukutaro HAMAOKA, Shuto YAMAMOTO, Seiji OKAMOTO, Kengo HORIKOSHI, Masanori NAKAMURA, Asuka MATSUSHITA, Yoshiaki KISAKA
  • Publication number: 20220028047
    Abstract: An information processing apparatus includes circuitry. The circuitry is configured to acquire read image data of an image formed on a recording medium. The circuitry is configured to acquire output target image data according to which the image is formed. The circuitry is configured to generate, based on the output target image data, inspection image data for inspection of the read image data. The circuitry is configured to compare the read image data corrected based on an amount of deviation caused by conveyance of the recording medium with the inspection image data generated, to detect an image abnormality. The circuitry is configured to highlight and output a position of a portion of the image abnormality in the read image data before correction, based on the amount of deviation caused by conveyance of the recording medium, in response to the image abnormality being detected.
    Type: Application
    Filed: July 23, 2021
    Publication date: January 27, 2022
    Inventors: Yohta MASHIKO, Tadashi KITAI, Akira MASUDA, Takahiro KOYAMA, Kengo YAMAMOTO