| 摘要 |
PROBLEM TO BE SOLVED: To make obtainable an image of no distortion in an X-ray display apparatus for visualizing X-ray iamge using an X-ray fluorescence amplifier tube. SOLUTION: A positive distorted aberration is generated in a relay lens 10 for transmitting an image from an X-ray fluorescence amplifier tube 5 to a camera 20 to cancel a distortio of the intensifying tube 5. For this purpose, the relay lens 10 is composed of the first positive lens group G1 in a photo- receiving part 20 side of the camera 20, and the second lens group G2 havign positive refractive power, and the second lens group G2 is composed of the first positive sub-lens group G21, and the second negative sub-lens group G22 in this order from the photo-receiving part 20 side. Further, a focal distance f1 of the first lens group G1, a focal distance f21 of the first sub-lens group G21, a focal distance f22 of the second sub-lens group G22 and a focal distance (fa) of the whole relay lens system satisfy the relation: -0.7<(fa×f22)/(f1×f21)<-0.25.
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