Patents by Inventor Osamu Yoneyama

Osamu Yoneyama 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).

  • Semiconductor laser chip
    Patent number: 4847846
    Abstract: A semiconductor laser comprising a laser diode which is mounted on a semiconductor chip which has a monitoring photodiode formed therein so as to monitor the laser light output of the laser diode. The cathode of the laser diode and the anode of the monitoring photodiode are connected together, and a suitable forward voltage for the laser diode and reverse voltage for the monitor photodiode is provided by a single power supply which results in a simple construction of an output detection circuit for the monitor photodiode which produces an increased output over prior art devices.
    Type: Grant
    Filed: March 7, 1988
    Date of Patent: July 11, 1989
    Assignee: Sony Corporation
    Inventors: Haruo Sone, Isao Umezawa, Osamu Yoneyama
  • Laser device formed with a stripe light emission region
    Patent number: 4608695
    Abstract: A semiconductor laser device having a stripe light emission region formed in an active layer, a bent portion formed in the active layer on a light end portion of the light emission region in a range of approximately the width of the light emission region, and a flat portion formed in the active layer the width of which is made larger than that of the light emission region inside of the end portion of the light emission region.
    Type: Grant
    Filed: September 26, 1983
    Date of Patent: August 26, 1986
    Assignee: Sony Corporation
    Inventors: Tatsuji Oda, Takayoshi Mamine, Osamu Yoneyama