| 摘要 |
An optical disc apparatus includes: a light source unit in which a plurality of light emitting points that emit lights having different wavelengths each other are formed in vicinity; a condenser lens which condenses the light emitted from the light source unit on a recording layer of the optical disc; a photo detecting portion which receives the light reflected by the recording layer of the optical disc, a plurality of photo receiving regions are formed on the photo detecting portion to receive the reflected light in separate positions according to the respective wavelengths which are emitted from the light source unit; and a calculation processing portion, if a first photo receiving region is a photo receiving region which is essentially used to obtain a servo signal at reproduction of an optical disc that has a plurality of recording layers and a second photo receiving region is a photo receiving region not needed to be used essentially to obtain the servo signal among the plurality of photo receiving regions, the calculation processing portion performs a prescribed calculating process using a signal that is detected in the first photo receiving region and a signal that is detected in the second photo receiving region to perform correction of the signal that is detected in the first photo receiving region at the reproduction of the optical disc that has a plurality of recording layers.
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