| 摘要 |
PROBLEM TO BE SOLVED: To provide a high-precision pinhole of which the aperture is square even when the aperture is closed for light shielding and the aperture size is zero. SOLUTION: The aperture of the pinhole is demarcated by mutually adjustable foil edges. In the pinhole, each of at least two foil pieces has at least one edge, and foil pieces are arranged so that their edges form an L shape and/or are mutually coupled, and L-shaped coupling pieces are arranged one over the other so that they surround a rhombic or square light transmission path and are mutually moved for pinhole adjustment. COPYRIGHT: (C)2004,JPO
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