| 摘要 |
In an optical pickup device of the present invention, return light from an optical disk is diffracted by a diffraction element divided into two or more regions, and while a first light-receiving section receiving plus 1st-order diffracted light having passed through the first region of the diffraction element is provided on one side of an optical axis of a light beam not diffracted by the diffraction element, a second light-receiving section receiving minus 1st-order diffracted light having passed through the second region is provided on the other side of the optical axis. This arrangement makes it possible to easily and surely adjust the optical system of the optical pickup device.
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