| CPC G03B 21/005 (2013.01) [G03B 21/2066 (2013.01); G03B 21/28 (2013.01); G03B 21/56 (2013.01)] | 15 Claims |
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1. An optical device comprising:
a first optical system having an optical element;
a second optical system having a lens and disposed at a reduction side of the first optical system;
a first holding member holding the optical device;
a second holding member holding the lens; and
a movement mechanism configured to move the first holding member in optical axis directions along an optical axis of the optical element, wherein
the optical element has a reflection surface,
the first holding member has a first holding portion disposed at an enlargement side of the second optical system and holding the optical element, and a first coupling portion extending from the first holding portion to a second optical system side,
the movement mechanism has a transport mechanism disposed at an outside in a radial direction of the second optical system and configured to move the first coupling portion along the optical axis directions, and a guide mechanism disposed at an outside in a radial direction of the first holding portion and configured to guide the first holding member in the optical axis directions,
the transport mechanism has a cam member rotatable around the optical axis and a first cam portion provided in the cam member, wherein when the cam member is rotated a first pin moves the first holding member in a first optical axis direction and the optical element in the first optical axis direction; and
the guide mechanism restricts rotation of the first holding member around the optical axis.
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