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:
Aug. 28, 2007
Filed:
Aug. 10, 2004
Jia-hao Lin, Wu Jih Hsiang, TW;
Chih-hsien Kao, Hsin Chu, TW;
Hsu-feng Ho, Tai Pei, TW;
Shih-hao KE, Ta Li, TW;
Jia-Hao Lin, Wu Jih Hsiang, TW;
Chih-Hsien Kao, Hsin Chu, TW;
Hsu-Feng Ho, Tai Pei, TW;
Shih-Hao Ke, Ta Li, TW;
Mediatek Inc., Hsin Chu, TW;
Abstract
A method for measuring a tilt angle of a pickup head. The method includes the steps of: moving the pickup head to a track to be measured; radiating a laser beam with a constant power; defining a proper range of tilt control values; controlling the tilt angle of the pickup head according to the range of tilt control values, acquiring a RF signal corresponding to each tilt control value, and storing an associated value of a associated signal; detecting the maximum among the stored associated values; selecting and storing the tilt control value corresponding to the maximum as the optimum tilt control value for the track if there is a maximum; and modifying the range of tilt control values and executing the previous steps if there is no maximum. The so-called associated signal includes a tracking error signal, a reading/writing RF signal, an S-curve signal, or the RF signal.