| 摘要 |
A detection unit of an optical pickup apparatus includes an optical element to simultaneously extract plural specified lights having a different polarization direction respectively in a separated state from light from an optical recording medium, and a light amount measurement unit to simultaneously perform light amount measurement on each of the plural specified lights extracted by the optical element. At the time of reproduction of information, reflected light from the optical recording medium in the case where reproducing light is irradiated, or emission light emitted from the optical recording medium by irradiation of reproducing light is sent to a detection unit. The optical element extracts the plural specified lights having the different polarization direction respectively in the separated state, the light amount measurement unit simultaneously performs the light amount measurement on each of the plural specified lights extracted by the optical element, and the information recorded on the optical recording medium is reproduced from the ratio of light amounts.
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