Tracking system for use in regular and high density optical reco

Details Tracking system for use in regular and high density optical reco Tracking system for use in regular and high density optical reco

1994-09-07

1996-10-01

Dinh, Tan

Dynamic information storage or retrieval

Alternative diverse types of storage or retrieval

369 4437, G11B 1100

Patent

active

055616437

ABSTRACT:
A high-density recording medium has data tracks and guide tracks formed on both sides of each of the data tracks. Intervals between the guide tracks are set in such a manner that the outer edges of two adjacent guide tracks correspond in position to two tracking laser beam spots on the recording medium. To allow use of either of the high-density recording medium, and a conventional recording medium on which intervals between guide tracks are set in such a manner that the inner edges of two adjacent guide tracks correspond in position to two tracking laser beam spots, control is performed such that polarity of a tracking control servo is selectively inverted depending upon which of the high-density and conventional recording medium is used.

REFERENCES:
patent: 4243850 (1981-01-01), Edwards
patent: 4831609 (1989-05-01), Suzuki
patent: 5113378 (1992-05-01), Kimura
patent: 5123003 (1992-06-01), Noda et al.
patent: 5153863 (1992-10-01), Noda et al.
patent: 5375112 (1994-12-01), Togawa

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