Patents by Inventor Toshio Ishii

Toshio Ishii 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: 11231659
    Abstract: In response to determining that image forming in a color mode is performed on a first sheet and then image forming in a monochrome mode is successively performed on the second sheet, perform charging bias reduction processing gradually reducing a charging bias from first to second charging bias and developing bias reduction processing of gradually reducing a developing bias from first to second developing bias during a first inter-sheet period after the first sheet passes a first photosensitive drum and before the second sheet reaches the first photosensitive drum, and perform separation processing such that an execution period of the separation processing overlaps at least one of an execution period of the charging bias reduction processing and an execution period of the developing bias reduction processing, the separation processing being processing of controlling a moving mechanism to move a first developing roller from a contact position to a separation position.
    Type: Grant
    Filed: January 27, 2021
    Date of Patent: January 25, 2022
    Assignee: Brother Kogyo Kabushiki Kaisha
    Inventors: Junya Sumida, Shunsuke Ishii, Toshio Furukawa, Toshiyuki Sano, Shintaro Sakaguchi
  • Publication number: 20210305976
    Abstract: An equalizer has a first tapped delay line in which N taps (N is a positive integer) are connected in cascade, a second tapped delay line having one tap and connected in parallel with the first tapped delay line, a first multiplier configured to multiply signals extracted from the N taps by corresponding coefficients, a second multiplier configured to multiply a signal output from the second tapped delay line by a second coefficient, and an adder configured to add products of the first multiplier and a product of the second multiplier. The first tapped delay line has a fixed delay, and the second tapped delay line has a variable delay changeable at a 1/M resolution of the fixed delay, where M is a number greater than 1.
    Type: Application
    Filed: February 3, 2021
    Publication date: September 30, 2021
    Applicant: Fujitsu Optical Components Limited
    Inventor: TOSHIO ISHII
  • Publication number: 20210266009
    Abstract: An optical communication apparatus includes a level detector, an FIR filter, and a adjustor. The level detector detects level information that discriminates a change in a multi-value level based on an input signal used in a multi-value amplitude modulation system. The FIR filter compensates a signal band of the input signal in accordance with tap coefficients of a plurality of multipliers. The adjustor corrects the tap coefficient of each of the multipliers included in the FIR filter based on the level information detected in the level detector.
    Type: Application
    Filed: February 1, 2021
    Publication date: August 26, 2021
    Applicant: Fujitsu Optical Components Limited
    Inventor: TOSHIO ISHII
  • Patent number: 10659154
    Abstract: An optical module has an optical amplifier that amplifies an optical signal in which multiple wavelengths are multiplexed, an optical demultiplexer that separates the multiple wavelengths from the optical signal having been amplified by the optical amplifier, a first photodetector that monitors the optical signal at an input side of the optical amplifier, a second photodetector that monitors each of the multiple wavelengths at an output side of the optical demultiplexer, and a control circuit that controls a center wavelength of a filter of the optical demultiplexer based upon a first output from the first photodetector and a second output from the second photodetector.
    Type: Grant
    Filed: May 30, 2019
    Date of Patent: May 19, 2020
    Assignee: FUJITSU OPTICAL COMPONENTS LIMITED
    Inventors: Hoshihiko Toda, Toshio Ishii
  • Patent number: 10530495
    Abstract: An optical receiver includes photodetectors each provided on a corresponding channel of multiple channels and configured to detect an optical signal at the corresponding channel, a delay adjuster circuit provided before the photodetectors and configured to adjust a delay time of an optical waveform of an incoming signal on at least one channel, and a processor that controls the delay time such that a change point of a first optical waveform of a first channel is away from a data decision timing of a second optical waveform of a second channel, using information acquired from an electrical signal produced after photo-detection.
    Type: Grant
    Filed: November 30, 2018
    Date of Patent: January 7, 2020
    Assignee: FUJITSU OPTICAL COMPONENTS LIMITED
    Inventors: Masaru Akizawa, Naoki Kuwata, Toshio Ishii
  • Publication number: 20190379453
    Abstract: An optical module has an optical amplifier that amplifies an optical signal in which multiple wavelengths are multiplexed, an optical demultiplexer that separates the multiple wavelengths from the optical signal having been amplified by the optical amplifier, a first photodetector that monitors the optical signal at an input side of the optical amplifier, a second photodetector that monitors each of the multiple wavelengths at an output side of the optical demultiplexer, and a control circuit that controls a center wavelength of a filter of the optical demultiplexer based upon a first output from the first photodetector and a second output from the second photodetector.
    Type: Application
    Filed: May 30, 2019
    Publication date: December 12, 2019
    Applicant: Fujitsu Optical Components Limited
    Inventors: Hoshihiko TODA, Toshio Ishii
  • Patent number: 10256938
    Abstract: An optical receiver includes a demultiplexer configured to demultiplex, for each channel, optical signals input through a plurality of channels, a photoelectric converter having a number of light receivers corresponding to the plurality of channels, the photoelectric converter being configured to convert an optical signal into an electric signal for each channel, a monitor circuit configured to monitor, for each channel, an amplitude characteristic of the optical signal converted into the electric signal by the photoelectric converter, and a control circuit configured to control, based on a monitored result of the monitor circuit, a bias voltage to be applied to the light receiver such that an amount of variability in the amplitude characteristic between the channels is minimum or falls within a predetermined range.
    Type: Grant
    Filed: June 28, 2017
    Date of Patent: April 9, 2019
    Assignee: FUJITSU OPTICAL COMPONENTS LIMITED
    Inventor: Toshio Ishii
  • Publication number: 20190103922
    Abstract: An optical receiver includes photodetectors each provided on a corresponding channel of multiple channels and configured to detect an optical signal at the corresponding channel, a delay adjuster circuit provided before the photodetectors and configured to adjust a delay time of an optical waveform of an incoming signal on at least one channel, and a processor that controls the delay time such that a change point of a first optical waveform of a first channel is away from a data decision timing of a second optical waveform of a second channel, using information acquired from an electrical signal produced after photo-detection.
    Type: Application
    Filed: November 30, 2018
    Publication date: April 4, 2019
    Applicant: Fujitsu Optical Components Limited
    Inventors: Masaru Akizawa, Naoki Kuwata, Toshio Ishii
  • Publication number: 20180006756
    Abstract: An optical receiver includes a demultiplexer configured to demultiplex, for each channel, optical signals input through a plurality of channels, a photoelectric converter having a number of light receivers corresponding to the plurality of channels, the photoelectric converter being configured to convert an optical signal into an electric signal for each channel, a monitor circuit configured to monitor, for each channel, an amplitude characteristic of the optical signal converted into the electric signal by the photoelectric converter, and a control circuit configured to control, based on a monitored result of the monitor circuit, a bias voltage to be applied to the light receiver such that an amount of variability in the amplitude characteristic between the channels is minimum or falls within a predetermined range.
    Type: Application
    Filed: June 28, 2017
    Publication date: January 4, 2018
    Applicant: Fujitsu Optical Components Limited
    Inventor: Toshio ISHII
  • Patent number: 9605331
    Abstract: A batch annealing furnace includes a coil support base on which an end face of a coil is mounted and that supports the coil with an axis of the coil being upright, an inner cover that covers an entire body of the coil mounted on the coil support base, and a cooling pipe that extends downward from the upper part of the inner cover to a cavity of the inner peripheral part of the coil mounted on the coil support base and cools the coil from the inner surface side by passing a coolant through the inside of the cooling pipe.
    Type: Grant
    Filed: December 27, 2012
    Date of Patent: March 28, 2017
    Assignee: JFE STEEL CORPORATION
    Inventors: Seiko Nara, Toshio Ishii, Shinji Koseki, Katsuhiro Takebayashi, Naoki Nakata, Hiroyuki Fukuda, Eitaro Shidara, Takashi Wada
  • Patent number: 9203518
    Abstract: An optical transmitter includes an EA modulator, a photocurrent detection circuit, a modulator drive circuit, and a CPU. The EA modulator converts an input signal into an optical signal and outputs the optical signal. The photocurrent detection circuit detects an optical absorption current (a photocurrent) in the EA modulator. The modulator drive circuit controls the EA modulator. The CPU calculates a voltage to be applied to the modulator drive circuit based on the optical absorption current detected by the photocurrent detection circuit.
    Type: Grant
    Filed: July 30, 2012
    Date of Patent: December 1, 2015
    Assignee: FUJITSU OPTICAL COMPONENTS LIMITED
    Inventor: Toshio Ishii
  • Patent number: 9014570
    Abstract: An optical transmitter includes: a modulator driver to generate a drive signal from an input signal; a modulator to generate a modulated optical signal according to the drive signal; an amplitude detector to detect an input amplitude representative of an amplitude of the input signal; and a controller to generate a waveform control signal according to the input amplitude detected by the amplitude detector. The modulator driver controls a waveform of the drive signal according to the waveform control signal.
    Type: Grant
    Filed: March 12, 2012
    Date of Patent: April 21, 2015
    Assignee: Fujitsu Optical Components Limited
    Inventor: Toshio Ishii
  • Publication number: 20150001769
    Abstract: A batch annealing furnace includes a coil support base on which an end face of a coil is mounted and that supports the coil with an axis of the coil being upright, an inner cover that covers an entire body of the coil mounted on the coil support base, and a cooling pipe that extends downward from the upper part of the inner cover to a cavity of the inner peripheral part of the coil mounted on the coil support base and cools the coil from the inner surface side by passing a coolant through the inside of the cooling pipe.
    Type: Application
    Filed: December 27, 2012
    Publication date: January 1, 2015
    Inventors: Seiko Nara, Toshio Ishii, Shinji Koseki, Katsuhiro Takebayashi, Naoki Nakata, Hiroyuki Fukuda, Eitaro Shidara, Takashi Wada
  • Publication number: 20140348500
    Abstract: An optical receiver includes a first discriminator in which an optimal point of a slice level is set and that compares a received signal to the slice level and discriminately outputs the received signal; a second discriminator that is connected in parallel to the first discriminator, compares the received signal to a slice level, and discriminately outputs the received signal; and a computing device that variably controls the slice level of the first and the second discriminators, respectively. The computing device executes a first process of setting the slice level of the first discriminator to be a predetermined slice level, calculating a pseudo error rate obtained when the slice level of the second discriminator is caused to variably scan, and setting the slice level of the first discriminator within a range in which the error rate does not vary.
    Type: Application
    Filed: April 22, 2014
    Publication date: November 27, 2014
    Applicant: Fujitsu Optical Components Limited
    Inventor: Toshio ISHII
  • Publication number: 20130084065
    Abstract: An optical transmitter includes an EA modulator, a photocurrent detection circuit, a modulator drive circuit, and a CPU. The EA modulator converts an input signal into an optical signal and outputs the optical signal. The photocurrent detection circuit detects an optical absorption current (a photocurrent) in the EA modulator. The modulator drive circuit controls the EA modulator. The CPU calculates a voltage to be applied to the modulator drive circuit based on the optical absorption current detected by the photocurrent detection circuit.
    Type: Application
    Filed: July 30, 2012
    Publication date: April 4, 2013
    Applicant: Fujitsu Optical Components Limited
    Inventor: Toshio ISHII
  • Publication number: 20120251128
    Abstract: An optical transmitter includes: a modulator driver to generate a drive signal from an input signal; a modulator to generate a modulated optical signal according to the drive signal; an amplitude detector to detect an input amplitude representative of an amplitude of the input signal; and a controller to generate a waveform control signal according to the input amplitude detected by the amplitude detector. The modulator driver controls a waveform of the drive signal according to the waveform control signal.
    Type: Application
    Filed: March 12, 2012
    Publication date: October 4, 2012
    Applicant: FUJITSU OPTICAL COMPONENTS LIMITED
    Inventor: Toshio Ishii
  • Patent number: D687830
    Type: Grant
    Filed: December 28, 2012
    Date of Patent: August 13, 2013
    Assignee: Hitachi Solutions, Ltd.
    Inventor: Toshio Ishii
  • Patent number: D708182
    Type: Grant
    Filed: August 30, 2011
    Date of Patent: July 1, 2014
    Assignee: Hitachi Solutions, Ltd.
    Inventors: Toshio Ishii, Tadashi Kawasaki
  • Patent number: D712478
    Type: Grant
    Filed: August 30, 2011
    Date of Patent: September 2, 2014
    Assignee: Hitachi Solutions, Ltd.
    Inventors: Toshio Ishii, Tadashi Kawasaki
  • Patent number: D716809
    Type: Grant
    Filed: August 29, 2012
    Date of Patent: November 4, 2014
    Assignee: Hitachi Solutions, Ltd.
    Inventors: Toshio Ishii, Shigeru Kano