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: 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
  • Publication number: 20090236502
    Abstract: An optical receiver includes an avalanche photodiode inputting light under a bias voltage, a current monitoring unit configured to monitor a photocurrent flowing through the avalanche diode, and a control unit configured to control the bias voltage. When the magnitude of the photocurrent exceeds a specific threshold, the control unit decreases the bias voltage, and when the magnitude of the photocurrent is less than or equal to the specific threshold, the control unit keeps the bias voltage constant. The optical receiver may include a pre-amplifier disposed in series to the avalanche photodiode and configured to amplify the photocurrent. The specific threshold of the photocurrent corresponds to a dynamic range of the pre-amplifier.
    Type: Application
    Filed: March 24, 2009
    Publication date: September 24, 2009
    Applicant: FUJITSU LIMITED
    Inventor: Toshio ISHII
  • Publication number: 20090206146
    Abstract: A welding jig for holding a motorcycle fuel tank when the fuel tank is welded includes a plurality of attachments for holding said fuel tank through resilient bodies. The plurality of attachments have springs hold the outer plate of a fuel tank, and an inner jig positions an inner plate. The attachments are attached to clamp arms which are opened/closed by cylinders. When the overlap portion between the outer and inner plates is welded, the thermal deformation caused by welding is accommodated by the springs. The attachments are spaced from the fuel tank in the order in which the welding point is approached.
    Type: Application
    Filed: April 22, 2009
    Publication date: August 20, 2009
    Applicant: Honda Giken Kogyo Kabushiki Kaisha
    Inventors: Naoji Yamaoka, Yoshimasa Iwaguchi, Takashi Shimada, Setsuo Arai, Toshio Ishii
  • Patent number: 7544912
    Abstract: A plurality of attachments having springs hold the outer plate of a fuel tank, and an inner jig positions the inner plate. The attachments are attached to clamp arms which are opened/closed by cylinders. When the overlap portion between the outer and inner plates is welded, the thermal deformation caused by welding is accommodated by the springs. The attachments are spaced from the fuel tank in the order in which the welding point is approached.
    Type: Grant
    Filed: August 13, 2003
    Date of Patent: June 9, 2009
    Assignee: Honda Giken Kogyo Kabushiki Kaisha
    Inventors: Naoji Yamaoka, Yoshimasa Iwaguchi, Takashi Shimada, Setsuo Arai, Toshio Ishii
  • Patent number: 7526223
    Abstract: A housing in which a heat source for heating a member to be heated is disposable includes a first end and a second end in a longitudinal direction. Each of the first end and the second end is linked to a duct. A blowing unit is provided at the first end of the housing and causes an airflow in a space formed in a state in which the heat source is disposed in the housing. The duct linked to the second end of the housing is formed to extend from the second end. A length of the duct linked to the second end of the housing is longer than a hydraulic diameter by a predetermined number of times or more.
    Type: Grant
    Filed: May 1, 2006
    Date of Patent: April 28, 2009
    Assignee: Ricoh Company, Ltd.
    Inventors: Takefumi Adachi, Kazuhiko Imamura, Masaaki Tsuda, Toshio Ishii, Makoto Ando, Yuichi Watanabe
  • Patent number: 7424801
    Abstract: A diagnostic system in which the accuracy of the diagnosis of the deterioration state of a catalyst in a catalytic converter for cleaning the exhaust gas of an internal combustion engine is enhanced without incurring a rise in cost. The temperature of the catalyst is estimated using the operating-state signal (for example, the flow rate of intake air or the width of a fuel injection pulse) of the engine by a diagnostic device. The conversion efficiency of the catalyst calculated from the outputs of oxygen sensors is corrected using the estimated temperature by the diagnostic device. The deterioration state of the catalyst is diagnosed on the basis of the corrected temperature by the diagnostic device.
    Type: Grant
    Filed: March 29, 2006
    Date of Patent: September 16, 2008
    Assignee: Hitachi, Ltd.
    Inventors: Takashi Mukaihira, Toshio Ishii, Kiyoshi Miura, Kazuya Kawano
  • Patent number: 7389637
    Abstract: A diagnostic equipment for an exhaust gas cleaning apparatus installed for an engine, comprising a misfire detector which detects the misfire of the engine, and a secondary-air-system failure detector which detects the failure of a secondary air system. An index corrector corrects a deterioration index calculated by a deterioration-index calculator, in accordance with the detected result of the detector. A deterioration decision unit decides if the diagnostic equipment has failed, by the use of the corrected deterioration index. In a case where the extent of the misfire or the like is severe, a decision interrupter interrupts the decision of the deterioration decision unit. Thus, even when the misfire of the engine or the failure of the secondary air system has occurred, the detection of the deterioration of a catalyst does not err. It is therefore avoided to erroneously replace the catalyst which has not deteriorated yet, or to run the engine in spite of the deterioration of the catalyst.
    Type: Grant
    Filed: October 5, 2006
    Date of Patent: June 24, 2008
    Assignee: Hitachi, Ltd.
    Inventors: Yutaka Takaku, 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