Patents by Inventor Keiichiro Yasu

Keiichiro Yasu 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).

  • OPTICAL HEAD DEVICE AND INFORMATION
    Publication number: 20090109808
    Abstract: According to one embodiment, a laser drive circuit which supplies a drive current to a laser element which outputs light at a predetermined wavelength, and a laser control circuit which supplies a predetermined timing pulse for generation of relaxation oscillation in a laser drive current supplied to the laser drive circuit, the laser control circuit supplying a laser drive current higher than a threshold value which is supplied from the laser drive circuit to the laser element to enable laser light to be output from the laser element, the laser control circuit setting the laser drive current to a level lower than the threshold value on the basis of the timing pulse.
    Type: Application
    Filed: September 11, 2008
    Publication date: April 30, 2009
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Nobuaki Kaji, Kazuo Watabe, Takashi Usui, Keiichiro Yasu, Chosaku Noda, Kazuto Kuroda, Masahiro Saito