| 摘要 |
An optical pickup device includes a light source which emits a laser beam to an optical disk. An objective lens converts the emission beam into a converging beam, the converging beam passing through a transparent layer of the optical disk and forming a light spot on a recording surface of the optical disk. A photodetecting unit generates a read-data signal based on a reflection beam from the optical disk. A beam converting unit converts a reflection beam directed to the photodetecting unit such that the reflection beam is allowed to enter the photodetecting unit when a first optical disk is accessed, and a central portion of the reflection beam is allowed to enter the photodetecting unit and a peripheral portion of the reflection beam is inhibited from entering the photodetecting unit when a second optical disk is accessed.
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