| 摘要 |
An optical pickup apparatus includes a semiconductor laser for emitting laser light with a wavelength of at least from 400 nm to 415 nm and of which plane parallel to an active layer is located substantially in parallel to the recording surface of an optical recording medium and a reflection surface for reflecting laser light emitted from the semiconductor laser in the direction substantially perpendicular to the recording surface of the optical recording medium, the laser light being irradiated on the optical recording medium through an objective lens to record and/or reproduce the optical recording medium, wherein an angle theta formed between the direction of rays of light introduced into the reflection surface from the semiconductor laser and the direction in which recording tracks of the optical recording medium are extended is selected so as to satisfy: <?in-line-formulae description="In-line Formulae" end="lead"?>45°<=theta<90°<?in-line-formulae description="In-line Formulae" end="tail"?> Then, in an optical pickup apparatus and an optical recording and reproducing apparatus that can suitably applied to an optical recording medium including an optical recording medium having a BD (Blu-ray Disc) type arrangement, it is possible to maintain satisfactory recording and reproducing characteristics by irradiating light with a beam spot of an optimum profile on recording tracks.
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