OPTICAL ELEMENT AND OPTICAL APPARATUS WITH THE SAME

摘要

An optical element that can be easily installed at high positional accuracy in an optical apparatus. The optical element (1) is constructed such that its upper surface (5) and lower surface (6) form parts of the circumferential surface of a circular cylinder. The optical element (1) is fitted into and fixed to a holder member (11), in which a fitting hole (11c) into which the circular cylinder can be inserted is formed, such that the upper surface (5) and the lower surface (6) are in contact with the fitting hole (11c). In a state where the optical element (1) is fitted in the fitting hole (11c), the optical element (1) is rotatable about an axis A. This enables the optical element (1) to be fixed to the holder member (11) after tilt adjustment of a second side surface (3) and a third side surface (4) is performed in a very small order of magnitude.