| 摘要 |
PROBLEM TO BE SOLVED: To provide an illumination optical apparatus of which the light source device is not restricted on kind, and which can sufficiently obtain a contrast. SOLUTION: A light control device 480 for reducing a light amount in a light path is provided between a first lens array 418 and a second lens array 414 arranged to face the first lens array 418 and having a conjugation relation with a light source device 413. When controlling the light amount, since there is no need to control the light amount of a light source lamp 411, a high-pressure mercury lamp, a halogen lamp or metal halide lamp can be used as the light source lamp 411. Furthermore, the illumination optical apparatus is configured to reduce the light amount in the light path by the light control device 480, so that the sufficient contrast can be obtained by controlling the reduction amount. COPYRIGHT: (C)2004,JPO
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