|発明の名称||ANGLE-MEASUREMENT-ACCURACY MEASURING APPARATUS|
PROBLEM TO BE SOLVED: To realize a small angle-measuring-error measuring apparatus for easily preventing a measuring error from being generated due to a parallax between a visible-ray angle measuring device and a specimen.
SOLUTION: A mirror 6 reflects a light beam emitted by a beam combiner 5 to an arbitrary direction regarding a swivel, a depression and an elevation so as to be guided to a half-mirror group 7, the group 7 transmits and reflects the light beam so as to be guided to a position of the specimen and so as to be guided to other specimens, and the mirror 8 guides the light beam to the position of the specimen. Consequently, the small angle-measuring-error measuring apparatus for easily preventing the measuring error from being generated due to the parallax between the visible-ray angle measuring device and the specimen is realized by aligning a detection position coarsely to an extent that a bundle of rays is detected.
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