Optical disk with tracking guide of wind and unwind portions

Details Optical disk with tracking guide of wind and unwind portions Optical disk with tracking guide of wind and unwind portions

1997-07-01

1999-11-23

Dinh, Tan

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

G11B 724

Patent

active

059912596

ABSTRACT:
An optical disk substrate in which a winding groove, which is winding in accordance with address information, and a normal groove, which is not winding, are placed alternately in the radial direction as tracking guides used for tracking control. With respect to this optical disk substrate, a laser beam, which is used for forming patterns for the tracking guides, is applied while being switched alternately between the first mode that exerts oscillations in the disk radial direction in accordance with the address information and the second mode that does not exert oscillations. An optical disk has a construction in which at least a recording layer is formed on the optical disk substrate.

REFERENCES:
patent: 4862447 (1989-08-01), Opheij
patent: 5303216 (1994-04-01), Shinoda et al.
patent: 5463614 (1995-10-01), Morita
patent: 5537373 (1996-07-01), Horikiri
patent: 5539724 (1996-07-01), Ohtomo
patent: 5715217 (1998-02-01), Fuji
patent: 5820795 (1998-10-01), Takemori et al.
patent: 5844883 (1998-12-01), Kanno et al.

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