| 摘要 |
Provided are an optical pickup device which is compatible with a plurality of disc standards, and can stably monitor the outputs from light sources, and an objective lens system used in the optical pickup device. An optical pickup device 50 includes a light source 1 emitting light of a first wavelength of a red band and light of a second wavelength of an infrared band; a light source 10 emitting light of a blue-violet band for BD 10; a collimating lens 4; mirrors 5, 7 each transmitting a portion of a light beam outputted from the collimating lens 4 while folding an optical path of the other portion of the light beam; objective lenses 6, 8 each converging the light beam folded by the mirrors 5, 7 on a recording layer of an optical disc; and a light-receiving element 15 detecting an intensity of the light beam transmitted through the mirrors 5, 7. The collimating lens 4 adjusts the parallelisms of the lights emitted from the light sources 1, 10, and outputs the light of the first wavelength as a converging light beam, and the light of the second wavelength as a diverging light beam.
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