Technique for closed loop servo operation in optical disc tracki

Details Technique for closed loop servo operation in optical disc tracki Technique for closed loop servo operation in optical disc tracki

1997-06-02

1999-03-09

Young, W. R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4429, 369 4436, G11B 7085

Patent

active

058810366

ABSTRACT:
The present invention allows the light beam of an optical disc storage device to radially move between different information tracks of an optical disc while the storage device tracking servo loop remains in a continuous closed loop mode of operation. The invention operates to radially move a light beam from one information track to another during a closed loop mode of operation by activating two control signals introduced into the closed tracking servo loop to create a phantom track center that radially moves across the optical disc. Because the tracking servo loop is in a closed loop mode of operation, the tracking servo operates to keep the light beam centered on the point that the tracking servo considers to be the center of an information track; in this case the phantom track center. Therefore, the tracking servo causes the light beam to radially move across the disc in a closed loop mode of operation by keeping the light beam centered on the moving phantom track center.

REFERENCES:
patent: 4589103 (1986-05-01), Tajima
patent: 4651314 (1987-03-01), Yoshikawa et al.
patent: 4779251 (1988-10-01), Burroughs
patent: 5166915 (1992-11-01), Fuldner et al.
patent: 5170384 (1992-12-01), Edahiro et al.
patent: 5255253 (1993-10-01), Kagami et al.
Patent Abstracts of Japan, vol. 95, No. 10, Nov. 30, 1995, for JP-7-182668.

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