| 摘要 |
Disclosed is an illumination optical arrangement including light source means for supplying a substantially collimated light beam, and optical means for shifting the collimated light beam from the light source means toward the central axis of the light beam. The optical means includes an entrance surface axis-symmetrically disposed with a predetermined inclination with respect to the central axis to cause the collimated light beam to be refracted toward the central axis substantially at the same angle, and an exit surface axis-symmetrically disposed with said predetermined inclination with respect to the central axis to cause the light beam from the entrance surface to be refracted in a direction parallel to the central axis.
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