Patent ID: 9709876
Date: 2017-07-18
CPC Classifications: G02B,G03B

Claim:
1. An optical device comprising: a first member; a second member that is rotatable relative to the first member around a rotation central axis; a coupling unit that is disposed at 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, wherein, when viewed from a direction of the rotation central axis, an angle between a first axis and a second axis is 90 degrees at a predetermined position within a rotational range of the second member, and wherein 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.