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:
Mar. 18, 2008
Filed:
Nov. 15, 2004
Chao-ming Huang, Hsin-Chu, TW;
Yao-jen Liang, Chang-Hua Hsien, TW;
Chao-Ming Huang, Hsin-Chu, TW;
Yao-Jen Liang, Chang-Hua Hsien, TW;
Mediatek Inc., Hsin-Chu, TW;
Abstract
An optical disc drive includes a spindle motor, a control unit, and a detection device. The spindle motor is adapted for rotating an optical disc. The control unit controls rotation of the spindle motor. The detection device is coupled to and is controlled by the control unit to detect the rotation speed change rate of the spindle motor within a predetermined time period, to determine if the change rate detected thereby is smaller than a predetermined reference value, and to generate an output signal received by the control unit to indicate that the spindle motor has reached a state where the rotation speed thereof is stable when the change rate detected by the detection device is smaller than the predetermined reference value.