Light-amount control device for an optical-disk recording-reprod

Details Light-amount control device for an optical-disk recording-reprod Light-amount control device for an optical-disk recording-reprod

1993-07-30

1994-11-15

Dzierzynski, Paul M.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 54, G11B 700

Patent

active

053655079

ABSTRACT:
The first control data generating circuit continuously controls the output light-amount of a light source with respect to an optical disk that has not been formatted. In contrast, the second control data generating circuit controls the output light-amount of the light source at each of a plurality of sectors with respect to an optical disk that has been formatted. A discrimination circuit discriminates whether or not the optical disk has been formatted according to a detection of a header of each sector. According to a result of the discrimination of the circuit, a switch alley switches controlling operations between the first light-amount controlling operation and the second light-amount controlling operation. The difference between those two types of controlling operations merely lies in whether timing for controlling the light amount is dependent on each sector or not. Therefore, independent of whether or not the optical disk has been formatted, the light-amount control device of the present invention makes it possible to determine an optimum output light-amount by using a similar controlling operation.

REFERENCES:
patent: 5029155 (1991-07-01), Kenjo
patent: 5226027 (1993-07-01), Bakx
patent: 5305297 (1994-04-01), Nishiuchi et al.

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