| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical disk device which can precisely position a light beam spot at the center of an information recording track even if a land prepit is formed partially on the inner circumference side or outer circumference side of a land. SOLUTION: Based on the sum signal of each received signal from the division light receiving part of a photodetector 4 which receives a reflected light from an optical disk 1 in which a land part with the land pit formed in it and a groove ditch with information recording mark recorded in its center are alternately formed in the direction of the radius of the disk, a correction means 7 which outputs an offset correcting voltage so that the amplitude of an RF signal obtained from the information recording mark may be maximum is provided, and the light beam spot S can precisely be positioned at the center of the information recording track even when the land prepit is formed partially on the inner circumference side or outer circumference side of the optical disk.
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