| 摘要 |
PURPOSE:To unnecessitate a complicated arithmetic circuit or driving mechanism for correcting the deviation of an optical axis by correcting the deviation of the optical axis by especially simple structure concerning the separate type optical pickup. CONSTITUTION:A transparent member 32 having a prescribed refraction factor is provided in an optical path between a parallel beam incident/emissive hole 2a provided at a fixed optical system 3 and a triangular prism 6 provided at a movable optical system 3 when the movable optical system 3 is positioned closest to the fixed optical system 2, and the transparent member 32 is fixed to the incident/emissive hole 2a of the fixed optical system 2 and reaches near the triangular prism 6 provided at the movable optical system 3 in the state of protruding the transparent member 32 from the incident/emissive hole 2a, and the transparent member 32 constitutes the optical path between the incident/ emissive hole 2a of the fixed optical system 2 and the triangular prism 6. |
