| 摘要 |
An optical pickup apparatus for shining light on and detecting reflected light from an optical disk having two recording layers. The apparatus includes a light source, an optical system situated on a path of a light beam returning from the optical disk, the optical system including a light condensing optical unit, a light beam regulating unit, and one or more photo detectors, situated between a position where the light reflected by the first recording layer contained in the partial light beam is condensed and a position where the light reflected by the second recording layer contained in the partial light beam is condensed, the one or more photo detectors having a first photo detecting section to detect the light reflected by the first recording layer and a second photo detecting section to detect the light reflected by the second recording layer.
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