Optical disk apparatus using transition control between position

Details Optical disk apparatus using transition control between position Optical disk apparatus using transition control between position

1991-06-25

1993-08-31

McElheny, Jr., Donald E.

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

369 4428, G11B 7085

Patent

active

052415228

ABSTRACT:
An optical disk apparatus with an optical disk having tracks, an optical head having an object lens, a positioner to move the optical head along the optical disk, a tracking actuator to move the object lens, a tachometer to detect the velocity of the positioner, and a seek operation controller. The seek operation controller effects a positioner seek operation to move the positioner in accordance with velocity difference between a target light beam velocity generated based on distance from a current track to a target track and an actual light beam velocity detected by the controller at a first detection period and a lens seek operation to move the tracking actuator in accordance with velocity difference between the target light beam velocity and an actual light beam velocity detected by the controller. The controller also effects a transition control operation in a transition between the positioner seek operation and lens seek operation. In the transition control operation, because an actual light beam velocity is detected by the tachometer without load of the controller, the controller can calculate the light beam velocity more accurately. Therefore, when the seek operation transfers to the lens seek operation from the positioner seek operation, the seek operation can be carried out more stably without disabling the servo control of the positioner.

REFERENCES:
patent: 4627038 (1986-12-01), Abed et al.
patent: 5090001 (1992-02-01), Ito et al.
patent: 5121370 (1992-06-01), Yanagi

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