Patent ID: 7062120

Claim:
An optical device comprising: first to Nth (N is an integer of 2 or more) pairs of optical paths, each pair including a first and second optical path having optical axes not parallel to each other; first to Nth light reflecting surfaces movable along predetermined paths; an optical decomposer for decomposing multiplexed light that contains first to Nth components having different characteristics into the first to Nth components; and an optical composer for combining the decomposed first to Nth components into the multiplexed light, the Kth (K is an integer from 1 to N) decomposed component traveling through the first optical path of the Kth pair, the Kth reflecting surface having a first planar portion for reflecting the Kth decomposed component from the first optical path of the Kth pair toward the second optical path of the Kth pair, and a second planar portion having a connection to the first planar portion, the Kth reflecting surface being movable to allow the connection between the first and second planar portions of the Kth reflecting surface to cross the optical axis of the first optical path of the Kth pair, in the Kth reflecting surface, the second planar portion forming an angle θ 1 with the first planar portion, angle θ 1 satisfying a condition of 175°≦θ 1 <180° in either clockwise or counterclockwise rotation from the first planar portion, the optical composer combining the first to Nth components traveling on the second optical paths of the first to Nth pairs.