Method of, and system for, detecting an excessive loading condit

Details Method of, and system for, detecting an excessive loading condit Method of, and system for, detecting an excessive loading condit

1988-04-15

1989-12-05

McElheny, Jr., Donald

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

250201, 369 58, G11B 1904

Patent

active

048857335

ABSTRACT:
A system for detecting an excessive loading condition of multiple disks in an optical disk reading apparatus. In the system, a parking position of a pickup is established at a predetermined position between respective outer circumferences of a first large-diameter disk and a second small-diameter disk. Upon application of a predetermined input for initiating a reproduction operation, a focusing servo is locked-in or initially focused at the parking position. The pickup is then moved to a lead-in region which is at an inner circumference of the first disk. If the lock-in of the focusing servo is released (i.e., a substantial variation in focusing is sensed) during movement of the pickup, a predetermined operation amounting to an alarm indication is performed to indicate that there is an excessive loading condition of multiple disks in the video disk apparatus.

REFERENCES:
patent: 4446546 (1984-05-01), Miller
patent: 4512003 (1985-04-01), Kimura et al.
patent: 4654516 (1987-03-01), Ando
patent: 4700056 (1987-10-01), Silvy et al.
patent: 4701603 (1987-10-01), Dakin et al.
patent: 4723234 (1988-02-01), Katsuyama et al.
patent: 4724492 (1988-02-01), Kosaka et al.

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