Optical disk with pre-recorded marker pattern

Details Optical disk with pre-recorded marker pattern Optical disk with pre-recorded marker pattern

1985-07-10

1987-08-04

Richardson, Robert L.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 47, 369 59, G11B 700

Patent

active

046850961

ABSTRACT:
An optical recording disk comprises a track divided into sectors and having a longitudinal axis. Areas on this track for writing data using a predetermined increment alternate with prewritten marker areas. Each of these comprises at least two patterns having leading and trailing edges. Part of at least one of these patterns is offcenter relative to the track axis and associated with at least one edge of a pair of leading and trailing edges combined with another pair of leading and trailing edges to define along the axis two predetermined distances. Each of these distances is between two consecutive multiples of the data writing increment. The patterns are adapted to be scanned optically in succession by a read spot to detect any track following error, by virtue of interaction of the read spot with at least the offcenter pattern part, and with reference to a timebase synchronization signal resulting from interaction of the read spot with at least two leading edges and at least two trailing edges.

REFERENCES:
patent: 4566091 (1986-01-01), Gerard et al.

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