| 摘要 |
PURPOSE:To uniformize efficiently the distribution of luminance on an original surface with a simple constitution by arranging a convergent/divergent filter in front of a flash lamp within a range of direct light beams. CONSTITUTION:The convergent/divergent filter 13 consists of a concave lense, a stepped concave lens, a convex lens, or a stepped convex lens and is arranged so that light beams radiated from a lamp 11 and converged/diverged within the range of light beams directly irradiated to the original surface is irradiated to a specific range on the original surface and the specific range is set up so that convergent/divergent beams with high luminance are irradiated to a part to be low luminance only by light beams reflected by a reflecting cover 12 so as to correct the low luminance. Since the light beams reflected by the reflecting cover 12 are reached to the original surface without being transmitted through the filter 13, it is unnecessary to consider the change of an optical path due to the filter 13, so that the reflecting cover 12 can be easily designed and direct light from the lamp 11 can be irradiated to the part of the original surface which shows low luminance only by the illumination due to the reflected light from the reflecting cover 12 based on the action of the filter 13.
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