Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1992-02-07
1994-07-05
Young, W. R.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 4428, 369 4432, 369 4434, 369 54, G11B 7095
Patent
active
053274075
ABSTRACT:
A tracking control apparatus includes an A/D converter, an edge detection circuit, a latch circuit and a ROM to change a tracking error signal having a sinusoidal characteristic representing a relative position of a light beam and a track on a disk to have a sawtooth characteristic representing the relative position. Stable tracking control free from off-tracking due to a disturbance is attained even when amplitudes of the tracking error signal and a tracking sum signal are not equal.
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Uekawa, Y., et al, "The development of digital servo algorithms for optical disc players," IEEE Transactions on Consumer Electronics, vol. 36, No. 3, Aug. 1990, pp. 567-571.
Patent Abstracts of Japan, vol. 9, No. 2 (P-325) [1725], Jan. 8, 1985 & JP59-152565.
Fukui Yukio
Suzuki Motoyuki
Suzuki Yoshio
Hitachi , Ltd.
Young W. R.
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