Focused spot position-discriminating system and optical disk wit

Details Focused spot position-discriminating system and optical disk wit Focused spot position-discriminating system and optical disk wit

1997-11-07

1999-09-14

Young, W. R.

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

G11B 700

Patent

active

059532980

ABSTRACT:
It is an object of the invention to provide a focussed spot position-discriminating system and an optical disk with a guiding groove suited therefor. A laser light emitted from a laser light source is focussed on the optical disk with the guiding groove by an objective lens. The servo control circuit of a servo control system for controlling the position of the objective lens discriminates whether the focussed spot is on a land track or a groove track based on the offset of the focussing error signal. The depth of the guiding groove is selected to be .lambda./8 to .lambda./6 in order to obtain nearly the maximum offset of the focussing error signal.

REFERENCES:
patent: 5245598 (1993-09-01), Burroughs
patent: 5414451 (1995-05-01), Sugiyama et al.
patent: 5537373 (1996-07-01), Horikiri
Patent Abstracts of Japan, vol. 096, No. 004, Apr. 30, 1996, for JP 7-320285.
Patent Abstracts of Japan, vol. 096, No. 10, Oct. 31, 1996, for JP 8-167147 .

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