Optical pickup device for emitting laser beams having different wavelengths and optical disk driver for use therewith

An optical pickup device for emitting at least two laser beams whose wavelengths are different from each other to be suitable for respective optical recording mediums, either of which optical recording mediums is selectively operated on an optical disk driver so that a signal is read out from and/or recorded onto the selected one of the optical recording mediums, the optical pickup device comprising:

• a light beam source that generates the laser beams;
• an objective lens that focuses the laser beams on respective recording surfaces of the optical recording mediums;
• an upstream common optical path that passes, along a common optical axis thereof, the laser beams from the light beam source;
• a downstream common optical path for that passes, along a common optical axis thereof, the laser beams toward the objective lens;
• a pair comprising a divergence point and a confluence point between the upstream and downstream common optical paths, at which divergence point the laser beams from the upstream common optical path diverge from each other, and at which confluence point the laser beams converge into the downstream common optical paths;
• and
• an anamorphic system arranged between the divergence point and confluence point along one of the laser beams that changes a cross-sectional shape of the one of the laser beams from an oval to a circle.