| 摘要 |
An optical pickup device has first emitting section emits first laser light, second emitting section emits second laser light, objective lens focuses first and second laser lights and emits focused laser lights to information storage medium, splitter section receives reflection lights of first and second laser lights and splits lights, light receiving section receives each of reflection lights of first and second laser lights and outputs detection signal, differential calculating section obtains differential signal between detection signals and outputs tilt signal indicating tilt of information recording medium on basis of differential signal, and correcting section corrects tilt of information recording medium with respect to emission direction of at least one of first and second laser lights on basis of tilt signal.
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