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:
Apr. 25, 2000
Filed:
Apr. 30, 1998
Chi-Kwong Ho, Hsinchu, TW;
Chao-Long Tsai, Changhua Hsien, TW;
Mediatek, Inc., , TW;
Abstract
A method is provided for use on an optical disc drive, which can automatically detect the current radial position of the pickup head to thereby switch the motor operation between the CLV (constant linear velocity) mode and the CAV (constant angular velocity) mode for optimal performance of the optical disc drive. The current radial position of the pickup head is detected by using CLV and CAV position estimating means. If the current radial position of the pickup head is at a preset switching point, the mode of operation is switched from the current one to the other. Moreover, the reference signals used in the respective modes are adaptively varied so as to allow the data transfer rate of the data read operation on the optical disc to be consistent in both modes without interrupting the reading and transferring of the data from the optical disc. The method can thus allow the benefits of a high data transfer rate, short seek time, and low power consumption by the optical disc drive.