PURPOSE: To enable highly accurate adjustment satisfying the adjustment condition of an optical system to be made by setting a laser beam perpendicularly to the target of an X-ray source across an X-ray focal point position, and adjusting the optical system using the beam as an optical axis.
CONSTITUTION: A laser beam perpendicular to the target of an X-ray source 1 is set, using a half mirror 3. A mirror is first attached to an optical part requiring perpendicular alignment, for example, a fluorescent screen holder. Then, the half mirror 3 is observed with an observation camera 4, and a laser beam travelling toward a fluorescent screen 5 through the half mirror 3 is detected as emitted from the position P1 of the mirror 3. Furthermore, it is observed that this laser beam has arrived at the position P2 of the mirror 3 after reflection on the attached mirror. Then, the inclination of the fluorescent screen holder in both horizontal and vertical directions is so adjusted so as to keep the positions P1 and P2 superposed on top of each other. According to this construction, the perpendicularity of the fluorescent screen 5 can be accurately maintained.
IWATA SATOSHI
NISHIYAMA YOJI
