Dynamic information storage or retrieval – Information location or remote operator actuated control – Selective addressing of storage medium
Patent
1990-10-03
1993-01-26
Chin, Tommy P.
Dynamic information storage or retrieval
Information location or remote operator actuated control
Selective addressing of storage medium
369 4428, 369 4411, 369 58, 369 41, 360 7806, 360 7303, 360 7702, G11B 7085
Patent
active
051827360
ABSTRACT:
A deceleration control system is applied to an optical disk unit which includes an optical head for recording information on and/or reproducing information from tracks of an optical disk which rotates at a constant velocity by use of a light beam emitted from the optical head, a track actuator for moving the light beam in a direction traversing the tracks of the optical disk, and a tracking error signal generation circuit for deriving a tracking error signal TES from a signal which is output from the optical head and is dependent on a light beam received from the optical disk. The deceleration control system includes a velocity control part and a deceleration part. The velocity control part includes a first circuit for generating a target velocity V.sub.t, a second circuit for detecting a beam moving velocity V based on the tracking error signal TES derived by the tracking error signal generation circuit, and a third circuit for detecting a velocity error V.sub.e of the beam moving velocity V with respect to the target velocity V.sub.t and for controlling the track actuator so as to minimize the velocity error V.sub.e. The deceleration part decelerates the track actuator, and includes a circuit for deriving a deceleration time T based on the beam moving velocity V at a track which precedes the target track and supplying a deceleration pulse to the track actuator for the deceleration time T starting from a time when the light beam is a predetermined distance from the target track.
REFERENCES:
patent: 4835752 (1989-05-01), Nakatsu et al.
patent: 4932013 (1990-06-01), Kojima et al.
patent: 5033037 (1991-07-01), Yanagi
patent: 5050146 (1991-09-01), Richgels et al.
patent: 5065383 (1991-11-01), Tateishi et al.
Chin Tommy P.
Fujitsu Limited
Truong Khoi
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