| 摘要 |
PROBLEM TO BE SOLVED: To provide a diffraction optical element which can perform positioning between an object area to be illuminated and itself without reducing light usage efficiency and to provide an irradiation apparatus having the diffraction optical element and a projector having the irradiation apparatus. SOLUTION: The diffraction optical element is characterized by producing the first illumination light S1 which illuminates the object area S to be illuminated on a predetermined surface to be illuminated 11 and the second illumination light S2 for positioning which illuminates an area except the object area S to be illuminated and performs relative positioning between the first illumination light S1 and the object area to be illuminated S. COPYRIGHT: (C)2009,JPO&INPIT
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