Method of and apparatus for correcting edge interval of pit in o

Details Method of and apparatus for correcting edge interval of pit in o Method of and apparatus for correcting edge interval of pit in o

1991-09-24

1995-05-23

Chin, Tommy P.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369124, G11B 700

Patent

active

054187702

ABSTRACT:
A pit edge interval correcting method in an optical recording/read-out apparatus wherein as data items to be used to correct pit edge intervals for cancellation of a thermal interference from a previously recorded pattern, there is formed a table representing relationships between kinds of record patterns and edge shift quantities of the patterns in a read-out signal. Edge shift quantities of particular patterns with respect to a unitary variation quantity of a recording medium surface temperature (an ambient temperature of an optical disk) and edge shift quantities of particular patterns with respect to a unitary variation quantity of laser power are beforehand acquired as correction control data. Before actual data are recorded, the particular patterns are again recorded on a medium and read out therefrom. If an edge shift occurs in a read-out signal, a variation quantity of the recording medium surface temperature and a variation quantity of the laser power are separately obtained based on a quantity of the edge shift occurring and the correction control data collected in advance. Using each variation quantity, the value set to the laser power is altered and/or the data in the table are updated to correct the actual data.

REFERENCES:
patent: 4873680 (1989-10-01), Chung et al.
patent: 4979162 (1990-12-01), Kimoto et al.
patent: 5043971 (1991-08-01), Van et al.
patent: 5070495 (1991-12-01), Bletscher, Jr. et al.
patent: 5072435 (1991-12-01), Balcx
"Application of Pit Edge Recording on PbTeSe Thin Films", Digest of National Conference on 70th Anniversary of Foundation of the IECE of Japan, pp. 4-176.

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