G - Physics – 11 – B
Patent
G - Physics
11
B
G11B 7/125 (2006.01)
Patent
CA 2100047
A first control data generating circuit continuously controls an output light-intensity of a light source with respect to an optical disk that has not been formatted. A second control data generating circuit controls the output light- intensity 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 circuit, a switch alley switches controlling operations between the first light-intensity controlling operation and the second light-intensity controlling operation. The difference between those two types of controlling operations lies in whether timing for controlling the light- intensity is dependent on each sector or not. Therefore, independent of whether or not the optical disk has been formatted, the light-intensity control device of the present invention makes it possible to determine an optimum output light-intensity by similar controlling operations.
Fuji Hiroshi
Iwaki Takashi
G. Ronald Bell & Associates
Sharp Kabushiki Kaisha
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