Patents by Inventor Yasuhiko Matsuyama

Yasuhiko Matsuyama 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).

  • Disk drive, position detection device and method of correction of position detection signal
    Patent number: 6747834
    Abstract: A method of correcting a position detection signal with a high precision in a short time and a position detection device able to be made compact and low cost, comprising detectors for outputting position detection signals including two signals having a phase difference of 180 degrees along with movement of an object to be detected and a signal processor for obtaining an offset voltage level by averaging the position detection signals and shifting a position detection signal so that a reference voltage level of a center of amplitude matches the voltage level. Also, the signal processor corrects an amplitude of a position detection signal by using two signals having a phase difference of 90 degrees.
    Type: Grant
    Filed: May 23, 2000
    Date of Patent: June 8, 2004
    Assignee: Sony Corporation
    Inventor: Yasuhiko Matsuyama