Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1995-06-15
1997-01-07
Young, W. R.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 4429, 369 58, G11B 7085
Patent
active
055924484
ABSTRACT:
An access control apparatus, with which a certain tracking and a stable accessing operation are possible even if a track density changes, wherein a track pitch discriminator to determine a difference in track density, that is a track pitch, is provided, detecting characteristics of a tracking error generator and a velocity detector, and a relationship between a counting value in a track counting circuit and an output from a reference velocity generator are changed in accordance with a result of the determination on the difference in track density, a tracking error signal corresponding to a dislocation of a light spot on an optical disk is obtained even if the track pitch changes, a relative speed of a positioner to the track is determined exactly, and an instructed speed corresponding to a distance to an objective track is settled.
REFERENCES:
patent: 4773052 (1988-09-01), Sugiura et al.
patent: 5023854 (1991-06-01), Satoh et al.
patent: 5065383 (1991-11-01), Tateishi et al.
patent: 5235583 (1993-08-01), Jongenelis et al.
Nikkei Electronics, Apr. 18, 1988, pp. 211-224. (Japanese).
Suzuki Motoyuki
Suzuki Yoshio
Hitachi , Ltd.
Young W. R.
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