| 摘要 |
An illumination apparatus is provided with: a light source including a group of light source segments arranged in an array; a lens array including a group of condenser lenses arrayed as opposed to the group of light source segments, and a group of rectangular lens elements arrayed as opposed to the group of condenser lenses, each of the lens elements converging a light ray that has been generated in the opposing light source segment and has been transmitted through the opposing condenser lens; and an illumination optical system which converges the rays that have been transmitted through the lens elements in such a manner that the rays are obliquely and superimposedly incident onto an illumination plane one over the other, wherein the lens elements are arrayed in a rectangular effective area with a clearance from each other, the effective area being defined by the illumination optical system as an area capable of arranging the lens elements, and one side of each of the lens elements being tilted relative to one side of the effective area by 45°.
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