| 摘要 |
PROBLEM TO BE SOLVED: To highly accurately measure outer-diameter variations of a lens barrel in which a lens system to be inspected is housed while using an inexpensive spindle. SOLUTION: An eccentricity measuring apparatus 1 for measuring the amount of eccentricity of the lens system to be inspected 101 housed in the lens barrel 100 includes an object-to-be-inspected holding part 10 having a bearing 12 and to which the lens barrel and the lens system to be inspected are mounted; a rotating mechanism 13 for rotating the object-to-be-inspected holding part on a rotating shaft 12B; an encoder 14 for detecting the angle of rotation of the object-to-be-inspected holding part; a length measuring instrument 15 for detecting outer-diameter variations of the lens barrel; an eccentricity measuring part 20 for measuring the amount of eccentricity of the lens system to be inspected; and a personal computer 30 for computing the locational relation between the center axis of the outer diameter of the lens barrel and the rotating shaft on the basis of output of the encoder and the length measuring instrument and computing the amount of eccentricity of the lens system to be inspected on the basis of output of the encoder and the eccentricity measuring part. Corrections values for correcting rotational errors of the bearing in diameter directions at each angle of rotation are previously stored in the personal computer to correct output of the length measuring instrument and output of the eccentricity measuring part through the use of the correction values. COPYRIGHT: (C)2011,JPO&INPIT
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