| 摘要 |
PROBLEM TO BE SOLVED: To effective correct out of focus due to the temperature rise of a projection unit. SOLUTION: A mirror holding mechanism 33 for a concave mirror 25 that the projection unit 17 includes has a mirror holder 41 and a mirror holder base 42. The concave mirror 25 is slidably stored in the mirror holder 41. A focus correction member 57 which expands thermally is disposed between the back face 25b of the concave mirror 25 and a reference surface S formed in the mirror holder 41. A mirror retainer spring 58 urges the concave mirror 25 and the focus correction member 57 to the reference surface S. COPYRIGHT: (C)2008,JPO&INPIT
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