Patents by Inventor Motohisa Kobayashi

Motohisa Kobayashi 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 driving device and method for optical recording and reproducion with acceleration/deceleration of focusing means being based on a focus error signal level
    Patent number: 5740136
    Abstract: A disk driving device for use in recording and/or reproducing data on an optical recording medium having a plurality of recording layers. When a focus jump operation is executed between the recording layers, an actuator displaces an objective lens in response to a selectively generated acceleration or deceleration pulse and a focus error signal. Instability of the focus jump operation derived from noise superimposed on the focus error signal or from sensitivity variations in the actuator is eliminated.
    Type: Grant
    Filed: August 1, 1996
    Date of Patent: April 14, 1998
    Assignee: Sony Corporation
    Inventors: Keiichi Tsutsui, Motohisa Kobayashi