| 摘要 |
An optical pickup apparatus comprises a first light source for emitting a first light flux having first wavelength lambda1 (430 nm>lambda1>380 nm), a second light source for emitting a second light flux having second wavelength lambda2 (lambda2>lambda1), an objective optical system having phase structure thereon, and at least one moving optical element for guiding the light flux into the objective optical system, the moving optical element being moved in a direction parallel to an optical axis corresponding to the first light wavelength lambda1 and the second light wavelength lambda2, wherein the objective optical system has phase structure and satisfies M1=M2=0, where, M1 and M2 denote a first and second magnifications of the objective optical system for recording and/or reproducing the information on or from the first and second optical information media.
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