Method of calculating write condition detection index and...

Details Method of calculating write condition detection index and... Method of calculating write condition detection index and...

2005-01-11

2005-01-11

McFadden, Susan (Department: 2655)

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

C369S053270, C369S053220, C369S047510, C369S053110

Reexamination Certificate

active

06842413

ABSTRACT:
It is an object of the present invention to obtain a write condition detection index with improved stability for a variation in temperature and with improved detection sensitivity for a write condition so that the index can more appropriately follow a variation in write condition. A write pit reflected light level Sp and a write space reflected light level Ss are detected. On the basis of these detected values Sp and Ss and write power Pw1with which laser beams from a semiconductor laser element exit an objective of an optical head during a write, an index Rm that is indicative of a write condition for an optical disk is determined using the equation Rm=Sp/Ss/(Pw1)2. Then, on the basis of the write condition detection index Rm, the write power Pw1is controlled.

REFERENCES:
patent: 9-91705 (1997-04-01), None
patent: 09091705 (1997-04-01), None
patent: 9-270128 (1997-10-01), None
patent: 2000-215454 (2000-08-01), None

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