Patents by Inventor Kazuo Hokozono

Kazuo Hokozono 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 disk drive wherein a preset reading laser power is used to generate a desired white laser power
    Patent number: 5231625
    Abstract: This invention relates to a technique for obtaining a desired laser power. In write mode the laser power in an optical disk drive is determined in accordance with a DAC value which controls a power supply for the laser, but the correlation between the laser power and the DAC value significantly varies depending on the efficiency of the individual laser diode or laser oscillator. Because the laser power in read mode has been adjusted to a predetermined value during manufacturing, the DAC value which generates the same laser power as the reading laser power is known and is used to generate the desired laser power, such as the writing laser power.
    Type: Grant
    Filed: September 11, 1991
    Date of Patent: July 27, 1993
    Assignee: International Business Machines Corporation
    Inventors: Kazuo Hokozono, Tatsuoki Shinohara, Akira Tokizono, Hideo Ueno