Patents by Inventor Kazuyoshi Takaishi

Kazuyoshi Takaishi 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).

  • Driving circuit for laser diode
    Patent number: 4837428
    Abstract: A laser diode power supply that uses a variable voltage as an input driving signal to provide a programmable laser diode output control instead of a constant reference voltage. The power supply includes a detector that samples light emitted from the laser diode, a controllable power supply that is capable to be operated by CPU, a current - voltage converter and a differential amplifier to which the output of the former two devices are applied.
    Type: Grant
    Filed: February 8, 1988
    Date of Patent: June 6, 1989
    Assignee: Ando Electric Co., Ltd.
    Inventors: Yasutomo Takagi, Kazuyoshi Takaishi
  • Square wave modulation circuit for laser diode
    Patent number: 4827116
    Abstract: A laser diode square wave modulation circuit includes a sample/hold circuit, a smoothing circuit and a laser driver with devices for regulating its output power. The sample/hold circuit maintains the signal to modulate free from square component even when a feedback loop to regulate the laser output applies a square wave to it.
    Type: Grant
    Filed: February 8, 1988
    Date of Patent: May 2, 1989
    Assignee: Ando Electric Co., Ltd.
    Inventors: Yasutomo Takagi, Kazuyoshi Takaishi