Method and apparatus for calibrating focus and tracking error si

Details Method and apparatus for calibrating focus and tracking error si Method and apparatus for calibrating focus and tracking error si

1994-04-06

1996-04-02

Young, W. R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4429, 369 4434, G11B 7095

Patent

active

055047262

ABSTRACT:
The present invention makes possible the calibration of the tracking error signal and the focus error signal repeatedly when an optical disk drive is in the normal operation mode. Errors (offset and amplitude error) of the focus error signal and the tracking error signal are detected during at least three track jumps by making use of a track jump performed once per rotation of disk in the track following mode. An offset value of the focus error signal is calculated based on the amplitude of a tracking error signal generated during at least two track jumps by adding a positive or negative offset to the original target value of the focus error signal, and values of offset and amplitude error of the tracking error signal are calculated based on a maximum value and a minimum value of a tracking error signal generated during at least one track jump without modifying the original target value of the focus error signal.

REFERENCES:
patent: 4707648 (1987-11-01), Minami
patent: 5048002 (1991-09-01), Horie et al.
patent: 5097458 (1992-03-01), Suzuki
patent: 5164932 (1992-11-01), Fennema et al.
patent: 5343454 (1994-08-01), Watanabe et al.
patent: 5351224 (1994-09-01), Nagata et al.
Patent Abstracts of Japan, vol. 17, No. 54, p. 1480, Feb. 3, 1993, & JP 4-265532.
"86 mm Magneto-Optical Disk Drive", Nakashima, et al., SPIE, vol. 1316 Optical Data Storage, pp. 16-29 (1990).
"Drive Control Technology in 90 mm Optical Disk Drive", Yoshimoto, et al., Mitsubishi Electric's Technological Report, vol. 66, No. 6, pp. 629-633 (1992).

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