Patents by Inventor Koichi Kobe

Koichi Kobe 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).

  • Correction circuit, drive circuit, light-emitting device and correction method of current pulse waveform
    Patent number: 8829813
    Abstract: A drive circuit and a drive current correcting method are described herein. The drive circuit comprises a current source that outputs a drive current, and a correction circuit that outputs a correction current. The correction circuit includes a first RC time constant circuit. An output terminal of the current source is connected to an output terminal of the correction circuit.
    Type: Grant
    Filed: February 8, 2011
    Date of Patent: September 9, 2014
    Assignee: Sony Corporation
    Inventors: Osamu Maeda, Takeshi Yuwaki, Katsuhisa Daio, Koichi Kobe, Hirofumi Nakano, Takahiro Arakida
  • Correction circuit, drive circuit, light emitting device, and method of correcting current pulse waveform
    Patent number: 8619827
    Abstract: A correction circuit is provided, which may reduce dullness of a light output waveform due to wavelength detuning. The correction circuit includes an RC time constant circuit. The RC time constant circuit is used to correct a waveform of a current pulse outputted from a current source, the current source driving a surface-emitting semiconductor laser in a pulsed manner, so that a pulse waveform of light output of the semiconductor laser is approximately a rectangle.
    Type: Grant
    Filed: August 23, 2010
    Date of Patent: December 31, 2013
    Assignee: Sony Corporation
    Inventors: Osamu Maeda, Katsuhisa Daio, Koichi Kobe, Takehiro Taniguchi, Takahiro Arakida
  • Correction circuit, drive circuit, light-emitting device and correction method of current pulse waveform
    Publication number: 20110241571
    Abstract: A drive circuit and a drive current correcting method are described herein. The drive circuit comprises a current source that outputs a drive current, and a correction circuit that outputs a correction current. The correction circuit includes a first RC time constant circuit. An output terminal of the current source is connected to an output terminal of the correction circuit.
    Type: Application
    Filed: February 8, 2011
    Publication date: October 6, 2011
    Applicant: Sony Corporation
    Inventors: Osamu Maeda, Takeshi Yuwaki, Katsuhisa Daio, Koichi Kobe, Hirofumi Nakano, Takahiro Arakida
  • Correction circuit, drive circuit, light emitting device, and method of correcting current pulse waveform
    Publication number: 20110075691
    Abstract: A correction circuit is provided, which may reduce dullness of a light output waveform due to wavelength detuning. The correction circuit includes an RC time constant circuit. The RC time constant circuit is used to correct a waveform of a current pulse outputted from a current source, the current source driving a surface-emitting semiconductor laser in a pulsed manner, so that a pulse waveform of light output of the semiconductor laser is approximately a rectangle.
    Type: Application
    Filed: August 23, 2010
    Publication date: March 31, 2011
    Applicant: Sony Corporation
    Inventors: Osamu Maeda, Katsuhisa Daio, Koichi Kobe, Takehiro Taniguchi, Takahiro Arakida
  • Impact detecting circuit, impact detecting apparatus, and recording and reproducing apparatus including same
    Patent number: 6798601
    Abstract: First and second integrating circuits are connected to both terminals of an impact sensor, and a difference between integration outputs of the integrating circuits is obtained by a differential amplifier. Voltage waveforms result from an input offset voltage in output terminals of the first and second integrating circuits and thereby cancel each other out. In essential impact detection, a comparator compares a differential output of the differential amplifier with a threshold level, whereby impact detection is performed.
    Type: Grant
    Filed: July 1, 2002
    Date of Patent: September 28, 2004
    Assignee: Sony Corporation
    Inventors: Keiji Narusawa, Koichi Kobe
  • Impact detecting circuit, impact detecting apparatus, and recording and reproducing apparatus including same
    Publication number: 20030039053
    Abstract: A first and a second integrating circuit and are connected to both terminals of an impact sensor, and a difference between integration outputs of the integrating circuits and is obtained by a differential amplifier. Voltage waveforms resulting from an input offset voltage in output terminals of the first and second integrating circuits and thereby cancel each other out. In essential impact detection, a comparator compares a differential output of the differential amplifier with a threshold level, whereby impact detection is performed.
    Type: Application
    Filed: July 1, 2002
    Publication date: February 27, 2003
    Inventors: Keiji Narusawa, Koichi Kobe