| 摘要 |
A first fixing plate 51 , which is bonded to a G light prism 29 and which holds a G light DMD unit 50 , is formed of a metal plate having a liner coefficient of expansion, which is substantially the same as that of the G light prism 29 . The G light DMD unit 50 is fixed by inserting holding projections 51 b into through holes 64 and inserting fixing holes 52 a of a second fixing plate 52 into the holding projections 51 b protruding through the through holes 64 . The fixing holes 52 a of the second fixing plate 52 have a shape similar to a section shape of the holding projections 51 b taken along a plane perpendicular to the insertion direction. A gap between each holding projection 51 b and the corresponding fixing hole 52 a is uniform in an overall circumference. A thickness of the adhesive filled in this gap is uniform.
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