Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1994-09-21
1996-03-26
Psitos, Aristotelis
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 4435, 369 50, G11B 700
Patent
active
055026982
ABSTRACT:
According to an automatic attitude correcting system of this invention, correction signals which are used to reduce control errors through a focus control, a tracking control, a tilt control, etc. are determined by measuring the amplitude of an RF reproduction signal reproduced from an optical disc at a predetermined area. For setting a correction signal value to be supplied to an attitude control mechanism such as an attitude control mechanism, a scanning signal whose signal level varies with time variation is supplied to a control mechanism driving circuit. The scanning signal varies in level at every one-revolution of the optical disc, and the amplitude of the RF reproduction signal is outputted from the optical head at every one-revolution of the optical disc, and measured at a predetermined angle for each level of the scanning signal. The maximum value is detected on the basis of the plural amplitude values thus measured, and the scanning signal value providing the maximum value is determined as a correction signal to be used in a reproducing operation. Therefore, in the reproducing operation, the control error of the control mechanism is excellently suppressed with the correction signal.
REFERENCES:
patent: 4052741 (1977-10-01), Baca et al.
patent: 4527263 (1985-07-01), Nakagawa
patent: 5228020 (1993-07-01), Shiragami et al.
"A Method For Auto Focus Positioning Adjustment Of Optical Disc Drive" presented to the 1990 Optical Memory Symposium held on Jul. 9, 1990 at Makuhari-Messe, Japan by Katsuya Watanabe et al. of Matsushita Electric. (English abstract is included in the paper).
Yoshihide Nakashima et al. "86mm Magneto-optical Disc Drive" SPIE vol. 1316, Optical Data Storage (1990), pp. 16-29. (written in English).
Kyosuke Yoshimoto et al. "Compensation Method Of Focusing Servo Of Optical Disk Drives", Conference Digest of Topical Meeting of Optical Data Storage (Mar. 1990), pp. 14-17. (written in English).
Meller Michael N.
Psitos Aristotelis
Tran Thang V.
Victor Company of Japan Ltd.
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