| 摘要 |
<p>A reflection optical device comprising reflection planes (2, 3), and a diaphragm (1) for limiting a light beam interposed between the reflection plane (2) closest to the object side and the object, wherein at least one of the plurality of reflection planes (2, 3) has a nonaxisymmetric shape and the reflection planes (2, 3) are disposed eccentrically. The reflection optical device further comprises means (6) for shielding light beams not emitted from objects, passing through the diaphragm and reaching the imaging range on an image plane (4) without being reflected off the reflection plane (2, 3). Since the light shielding means (6) is provided, unnecessary light beams do not reach the image plane directly and since a transmission plane having refraction power is not present, unnecessary light reflected off the transmission plane does not reach the image plane.</p> |
