Optical information recording disk having embossed clock mark pi

Details Optical information recording disk having embossed clock mark pi Optical information recording disk having embossed clock mark pi

1991-10-02

1994-03-15

Dzierzynski, Paul M.

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

369 4426, 360 7808, G11B 709

Patent

active

052951316

ABSTRACT:
In a first optical disk, a plurality of sets of bit information record cells, each cell including a plurality of bit information record cells, and a plurality of clock marks are formed along a track line on a substrate, and the bit information record cells are formed for example as pits, wherein the recording or reading of a bit of information to or from the bit information record cells is effected with a laser head. The information record cells are arranged at mutual intervals smaller than the minimum read distance of the laser head, while the clock marks are provided so as to have a distance from a set of bit information record cell which is larger than the minimum read distance of the laser head so that the clock marks can be recognized by the laser head to be used for synchronization. Then, the recording density can be improved. In a second optical disk, track recognition marks are arranged as d spiral at equiangular distances so that there are an odd number of track recognition marks per track unit. Thus, even if the track pitch is on the order of the minimum read distance, the distance between adjacent wobble marks becomes is about double the minimum read distance so that the wobble marks can be recognized independently for tracking error detection.

REFERENCES:
patent: 4428075 (1984-01-01), Hazel et al.
patent: 4443870 (1984-04-01), Hazel et al.
patent: 4704711 (1987-11-01), Gereard et al.
patent: 4707816 (1987-11-01), Yonezawa et al.
patent: 4858221 (1989-08-01), Romeas
patent: 5128916 (1992-07-01), Ito et al.

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