| 摘要 |
PURPOSE:To eliminate an ineffective X-ray exposure area when making an oblique photography at an arbitrary angle, by moving a rotary moving center of an X-ray tube with respect to a film surface by a constant distance corresponding to an angle of inclination of the X-ray tube. CONSTITUTION:A film 2 is held on a main body 5 by a Bucky part 4, and an X-ray tube 1 and a contraction yoke 7 is fixed at a rotatable bar 9 through a supporting arm 8. The lower end of the rotatable bar 9 is fixed to a supporting arm 13 provided with a slide block 11. The supporting arm 13 is related with a screw axis 14 and arranged so as to be able to move up and down with the slide block 11 by manipulating a handle 16. Accordingly, as the distance (h), between the film 2 and the center D of rotation of the X-ray tube 1 can be changed freely within a certain range, any ineffective X-ray exposure area projected from the film 2 can be eliminated to minimize hazard to body. |
