Track jump controlling apparatus which can output decelerating p

Details Track jump controlling apparatus which can output decelerating p Track jump controlling apparatus which can output decelerating p

1991-04-15

1993-03-16

Psitos, Aristotelis

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

369 4428, 369 43, G11B 700

Patent

active

051950693

ABSTRACT:
In order to make a track jump from the present track to a target track, accelerating pulses and decelerating pulses are sequentially fed to a tracking actuator driving an objective lens condensing and radiating light beams to a disc, then a tracking servo is switched on, a tracking error signal within a fixed time after the decelerating pulses is monitored with a zero cross comparator or the like and further the decelerating pulses can be additionally output to the tracking actuator in response to the output of this comparator. In case it is hard for the light spot to teach the target track, the light spot will be pulled to the target track side by switching on the tracking servo and, in case it passes over the target track, the light spot will be suppressed in passing over the switching on the tracking servo and the movement of the light spot will be decelerated by the additionally output decelerating pusles to pull the light spot into the target track.

REFERENCES:
patent: 4544872 (1985-10-01), Hirano
patent: 4613963 (1986-09-01), Hirano
patent: 4785439 (1988-11-01), Okada
patent: 4803675 (1989-02-01), Komatsu
patent: 4817069 (1989-03-01), Shigemori
patent: 4817073 (1989-03-01), Suzuki
patent: 4819219 (1989-04-01), Nagano
patent: 4843601 (1989-06-01), Eguchi
patent: 4899325 (1990-02-01), Katsuhara

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