| 摘要 |
A subject or original illuminating device includes a spot-like light source for emitting illuminating light, a plurality of optical fibers having first ends bundled together near the light source and opposite ends arranged in an array along a main scanning line on a subject to be illuminated, the opposite ends in the array being spaced at intervals which are progressively smaller from a center toward opposite ends of the array, and a cylindrical lens disposed between the opposite ends of the optical fibers and the subject for converging the illuminating light from the opposite ends of the optical fibers onto the main scanning line on the subject. The optical fibers may have their opposite ends equally spaced in the array and including selected light emitting ends spaced at intervals which are progressively smaller from a center toward opposite ends of the array, and the cylindrical lens may converge the illuminating light from the selected light emitting ends of the optical fibers onto the main scanning line on the subject.
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