| 摘要 |
An imaging system includes an incidence face having a plurality of optical faces formed along a first axis with a first pitch; a prism face having a plurality of grooves formed along the first axis with a second pitch; and an exit face having a plurality of optical faces formed along the first axis with a third pitch. A virtual plane extends from an end of the one optical face of the incidence face to an end of the one optical face of the exit face. Among light flux emitting from a spot light source and entering the one optical face of the incidence face, a light beam that passes over the virtual plane is reflected at the prism face, and passes over the virtual plane again and goes to the one optical face of the exit face. |
