| 摘要 |
An optical pickup device has a first combination reception and emission device ( 1 ) which emits laser beams ( 10 ) to an optical disk, and a second combination reception and emission device ( 2 ) which emits laser beams ( 11 ) having a wavelength different from that of the laser beams ( 10 ) to an optical disk. A DBS ( 3 ) is disposed on a path of the laser beams for making axes ( 12, 13 ) of the laser beams coincident with each other at an output side. A monitoring light detection element ( 9 ) is disposed near and above the DBS such that a light-receiving surface of the monitoring light detection element is substantially parallel with the optical axes ( 12, 13 ) of the laser beams ( 10, 11 ). The monitoring light detection element ( 9 ) receives laser beams outside of an effective region emitted by the first and second combination reception and emission devices ( 1, 2 ).
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