| 摘要 |
PROBLEM TO BE SOLVED: To provide a decentration measuring instrument for a lens system that supports a determination on whether or not lens center condensing positions are separable from each other of respective measured surfaces of a measured lens system before measuring decentration amounts. SOLUTION: This decentration measuring instrument 1 for measuring decentration amounts of respective measured surfaces of the measured lens system 12 is characterized by including: a light source 2; a zoom optical system 4 having a moving lens group 3 for guiding a light beam emitted from the light source 2 to the measured surfaces; a drive means 5 for driving the lens group 3; an imaging device 7 for taking reflected images obtained when the light beam is reflected by the measured surfaces; a personal computer 8 for generating determination support information for supporting a determination on whether or not a first and second lens center condensing positions are separable from each other, the first lens center condensing position being a spatial position of the lens group 3 condensing the light beam to the lens center of a first measured surface and the second lens center condensing position being of the second measured surface, by using separation sensitivity graduations set based on optical parameters of the optical system 4 and the reflected image; and a display 9 for displaying the support information. COPYRIGHT: (C)2008,JPO&INPIT
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