Optical device

Abstract

An optical device that includes first and second members that is rotatable relative to the first member is provided that includes a coupling unit that is provided for the second member; and a position detecting unit that has a detecting part disposed at the first member and a detected part disposed at the second member, and is configured to detect a position of the second member relative to the first member. When viewed from a direction along a rotation central axis of the second member, an angle between a first axis and a second axis at a position within a rotational range of the second member is 90 degrees. The first axis is an axis that is perpendicular to the rotation central axis and passes through the detecting part and the second axis is an axis that is perpendicular to the rotation central axis and passes through the coupling unit.

Dependencies are inferred from the claim text.