| 摘要 |
A compatible optical pickup and an optical recording/reproducing apparatus adopting the same are provided to enhance optical efficiency by correcting aberration to interchange 3 or more information storing medium standards by using one objective lens and simplifying an electrode structure of an element for aberration correction. An objective lens(30) condenses an incident beam on an information storing medium. The objective lens(30) is optimized in the first information storing medium which uses a beam emitted from a light source(11). The first optical system emits a beam for the second information storing medium. The first optical system is composed as a finite optical system. When the third information storing medium of standard different from standards of the first and the second information storing media or the second information storing medium is applied, an active correction element(20) actively converts an incident angle of the beam inputted to the objective lens(30). The active correction element(20) includes a plurality of transparent substrates, at least one material layer, and a hologram pattern. The material layer is located between the transparent substrates, and a refractive rate is converted according to a supplied voltage in the material layer. The hologram pattern, formed in a surface of the transparent substrate adjacent to the material layer, transmits the incident beam according to the conversion of the refractive rate of the material layer without diffraction, or diffracts the incident beam and changes an emission angle of the beam. The voltage supplied to the material layer is adjusted according to the applied information storing medium.
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