The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 12, 2006
Filed:
Nov. 13, 2003
Kuan-kai Juan, Tao-Yuan Hsien, TW;
Kun-hung Hsieh, Hsin-Chu, TW;
Kuan-Kai Juan, Tao-Yuan Hsien, TW;
Kun-Hung Hsieh, Hsin-Chu, TW;
MediaTek Inc., Hsin-Chu Hsien, TW;
Abstract
An optical disc apparatus includes a memory, a control circuit, a motor, a spindle, and a pickup head. When determining the type of optical disc, the optical disc apparatus moves a focusing lens at a constant velocity. A first duration is measured that indicates how much time it takes for the moving focal point of a laser shining through the focusing lens to pass through a first layer of the optical disc. A second duration is also measured that indicates how much time it takes for the moving focal point to move from the first layer to a second layer of the optical disc. A ratio of the second duration to the first duration indicates optical disc type.