| 摘要 |
PURPOSE:To accurately obtain a very small displacement, by setting a light source on an independent light source holding base while the light source holding base is displaced finely independent of the light source in two directions orthogonal to each other in a plane perpendicular to the optical axis of an optical system. CONSTITUTION:A light source 1 is set on an independent light source holding base 2, which is fixed on a Y-axis moving base 4. A Y-axis fixing base 5 supporting the Y-axis moving base 4 is fixed on an X-axis moving base 6, which is supported with an X-axis fixing base 7. Displacements between the Y-axis moving base 4 and the Y-axis fixing base 5, and between the X-axis moving base 6 and the X-axis fixing base 7 are made with micrometers 8 and 9 and the Y-axis fixing base 7 is mounted on a mounting pedestal 10. A point R is put as displaced by DELTAgamma from the focus F in a plane P perpendicular to the optical axis of an optical lens L and when an angle is set at between a straight line connecting the center S of the optical lens L and the point F and a straight line RS, DELTAgamma=alphatantheta (alpha: focal length) holds. Thus, the displacement of the Y-axis moving base 4 is obtained in 10mum with the micrometer 8.
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