Patents by Inventor Chee Wai Shum

Chee Wai Shum 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).

  • Pickup unit homing mechanism for a disk drive unit
    Patent number: 7398538
    Abstract: A disk drive unit for a disk includes a mounting plate, a spindle motor assembly, a slide mechanism provided with a slide, a pickup unit mounted on the slide, a first transmission member operatively connected with the slide, and a second transmission member. The first transmission member is positioned such that it is in engagement with the second transmission member when the pickup unit is in its read and/or write position, and such that the first transmission member is out of engagement with the second transmission member when the pickup unit is in its home position. In order to bring the first and second transmission members into engagement, the transmission members are provided with engagement members. As a result, a limit switch assembly is no longer necessary.
    Type: Grant
    Filed: June 23, 2004
    Date of Patent: July 8, 2008
    Assignee: Koninklijke Philips Electronics N.V.
    Inventors: Kum Chung Loh, Yu Zhou, Chee Wai Shum