| 摘要 |
In a light beam sensor ( 40 ) of a position adjuster, a light beam irradiated from a cross dichroic prism ( 150 ) is directly received by a CCD camera ( 41 ) via a beam splitter ( 451 ), so that the position adjuster can be adjusted without using a conventional projection screen and great size reduction of the position adjuster is possible, and, since only small space is required for installing the position adjuster, workspace can be efficiently utilized.
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