Reading information from a disk-shaped recording medium that is

Details Reading information from a disk-shaped recording medium that is Reading information from a disk-shaped recording medium that is

1997-07-22

1999-11-09

Tran, Thang V.

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

360 50, G11B 700

Patent

active

059827289

ABSTRACT:
A reproducing apparatus for disk-shaped recording medium rotationally drives the disk-shaped recording medium at a particular speed to read information from a recording track disposed circumferentially to the center of the recording surface with information recorded at a constant linear velocity. A pickup means scans the recording track and generating a first reproduction signal. A first rotational drive control means rotates the disk-shaped recording medium at a constant linear velocity based on the reproduction signal, and a second rotational drive control means rotates the disk-shaped recording medium at a constant angular velocity. A rotational drive control means selection means selects the first rotational drive control means or the second rotational drive control means based on the position of the pickup means when reproducing the disk.

REFERENCES:
patent: 5528574 (1996-06-01), Takeuchi et al.
patent: 5790488 (1998-08-01), Uemura

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