Method of switching the motor operation of an optical disc drive

Details Method of switching the motor operation of an optical disc drive Method of switching the motor operation of an optical disc drive

1998-04-30

2000-04-25

Hindi, Nabil

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369 50, 369 32, G11B 700

Patent

active

060552190

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.

REFERENCES:
patent: 5153869 (1992-10-01), Yoshimaru et al.
patent: 5182741 (1993-01-01), Maeda et al.
patent: 5751676 (1998-05-01), Kusano et al.

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