Patents by Inventor Naohiro Nishiwaki

Naohiro Nishiwaki 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: 8289020
    Abstract: A magnetic sensor arranged on a second line forming an angle of 45° at a switched position for switching a state being set up on a first line that projects displacement of center of magnetic field generating means generating a magnetic field.
    Type: Grant
    Filed: August 18, 2009
    Date of Patent: October 16, 2012
    Assignee: Kabushiki Kaisha Tokai Rika Denki Seisakusho
    Inventors: Naohiro Nishiwaki, Yasuo Takada
  • Publication number: 20100045283
    Abstract: A magnetic sensor arranged on a second line forming an angle of 45° at a switched position for switching a state being set up on a first line that projects displacement of center of magnetic field generating means generating a magnetic field.
    Type: Application
    Filed: August 18, 2009
    Publication date: February 25, 2010
    Applicant: KABUSHIKI KAISHA TOKAI RIKA DENKI SEISAKUSHO
    Inventors: Naohiro NISHIWAKI, Yasuo TAKADA
  • Patent number: 7432680
    Abstract: A motor control circuit for reducing current consumption. A stepping motor control circuit includes an A/B phase current setting signal generation circuit for generating an A/B phase current signal setting signals provided to a stepping motor driver to supply a stepping motor with a predetermined amount of drive current. Based on a switch signal, first and second switches selectively output an A/B phase current setting signal and an A/B phase reference signal, for reducing the drive current of the stepping motor more than the A/B phase current setting signal. An intermittent drive control circuit generates the switch signal. The stepping motor control circuit provides the motor driver with the A/B phase reference signal in accordance with the switch signal.
    Type: Grant
    Filed: March 3, 2006
    Date of Patent: October 7, 2008
    Assignee: Sanyo Electric Co., Ltd.
    Inventors: Tomonori Kamiya, Takeshi Kura, Yukihiko Shigeoka, Naohiro Nishiwaki
  • Publication number: 20060197488
    Abstract: A motor control circuit for reducing current consumption. A stepping motor control circuit includes an A/B phase current setting signal generation circuit for generating an A/B phase current signal setting signals provided to a stepping motor driver to supply a stepping motor with a predetermined amount of drive current. Based on a switch signal, first and second switches selectively output an A/B phase current setting signal and an A/B phase reference signal, for reducing the drive current of the stepping motor more than the A/B phase current setting signal. An intermittent drive control circuit generates the switch signal. The stepping motor control circuit provides the motor driver with the A/B phase reference signal in accordance with the switch signal.
    Type: Application
    Filed: March 3, 2006
    Publication date: September 7, 2006
    Inventors: Tomonori Kamiya, Takeshi Kura, Yukihiko Shigeoka, Naohiro Nishiwaki
  • Publication number: 20050276190
    Abstract: A control circuit provided in an optical disk apparatus which apparatus has a motor to move an optical pickup unit for performing record/playback control of an optical disk in a radial direction of the optical disk, sets a plurality of concentric annular zones on the optical disk, and performs record/playback control, for each zone, of the optical disk. The control circuit comprises a pulse period detector for detecting pulse periods of a periodic pulse control signal which drives the motor; and a zone determination section that determines the zone which the optical pickup unit is facing on the basis of the number of pulse period detection times detected by the pulse period detector.
    Type: Application
    Filed: June 9, 2005
    Publication date: December 15, 2005
    Inventors: Tomonori Kamiya, Takeshi Kura, Yukihiko Shigeoka, Naohiro Nishiwaki
  • Publication number: 20050213449
    Abstract: A slice level control circuit for obtaining optimal filter characteristics depending on optical disc data reading speed or optical disc condition, while achieving superior stability and response with respect to slice level. The control circuit cuts DC components in analog input signals to generate C-cut RF signals having adjusted DC levels. A comparator compares two C-cut RF signals to generate a binary RF signal for driving a charge pump circuit. An analog lowpass filter eliminates high-frequency components from the output signal of the charge pump circuit. An A/D converter circuit converts the cutoff output signal of the analog lowpass filter into a digital value signal according to sampling periods. A digital filter filters the digital value signal. A D/A converter converts the filtered digital value signal into an analog voltage signal. The analog voltage signal controls the slice level of the binary circuit.
    Type: Application
    Filed: March 18, 2005
    Publication date: September 29, 2005
    Applicant: SANYO ELECTRIC CO., LTD.
    Inventors: Tomonori Kamiya, Takeshi Kura, Naohiro Nishiwaki