| 摘要 |
PROBLEM TO BE SOLVED: To provide a projection system having a function capable of easily measuring and evaluating the deflection of a screen, the optical characteristics of a projection optical system or the like. SOLUTION: The projection system includes: a first pattern 2; an optical path branching means (half mirror 6) by which light emitted from the first pattern 2 is transmitted toward a projection lens 5 and light from the screen 3, emitted from the projection lens 5, is reflected; an imaging element 7 that captures light reflected by the optical path branching means; a second pattern disposed on the imaging face of the screen 3 or (near) an imaging face of the imaging element. The image of the first pattern 2 is projected onto the screen 3 by the projection lens 5. The image of the first pattern 2 on the screen 3 is projected onto the imaging element 7 by the projection lens 5. A moire stripe, arising from interference between the image of the first pattern 2 and the image of the second pattern 4 is detected by the imaging element 7. COPYRIGHT: (C)2009,JPO&INPIT
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