| 摘要 |
PROBLEM TO BE SOLVED: To provide technology capable of efficiently illuminating a prescribed illumination area, even when a 1st lens array in an illuminating optical system includes small lenses having respectively different thicknesses. SOLUTION: The illuminating optical system is provided with a light source device, a 1st lens array having plural 1st small lenses for dividing a beam flux projected from the light source device into plural pieces of partial beam flux and a 2nd lens array arranged in the vicinity of a position for converging the partial beam flux radiated from the 1st lens array and having plural 2nd small lenses, corresponding to the 1st small lenses. The 1st lens array includes plural 1st small lenses, having respectively different thicknesses and the size of each 1st small lens, is changed according to the thickness at the time of observing the small lens from the central axis direction of the beam flux radiated from the optical system.
|
