| 摘要 |
An illumination device for use in a slit exposure system for illuminating a document located on a document table. The illumination device has a light source with an elongated shape and a reflector surrounding a portion of the periphery of the light source and designed to reflect a light emitted from the light source toward the document. The reflector has a plurality of cylindrical reflecting surfaces. Each of the surfaces is designed to reflect while collimating a light virtually emitted from a linear area to be illuminated on the document table toward the light source, assuming that a line from which the light is emitted is located on the linear area.
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