| 摘要 |
An optical pick-up able to reduce a change of an optical axis of a light beam emitted to a photodetector when the optical element is tilted. An optical element in the optical pick-up is struck with an incident light beam from a first surface of a first prism, reflects the light beam refracted at the first surface at the second surface 161b, refracts the reflected light beam at the joined surfaces of the first prism and the second prism, and further refracts the refracted light beam at the first surface of the second prism to form an emitted light beam. The direction of the incident light beam and the direction of the emitted light beam perpendicularly intersect in the same plane. The optical element is struck with the light beam from the direction of the light beam emitted from the first surface of the second prism, reflects the light beam refracted at the first surface at the film, refracts the reflected light beam at a third surface, and emits it in a direction opposite to the direction of the incident light beam to the photodetector.
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