| 摘要 |
PROBLEM TO BE SOLVED: To attain the longer life and slower deterioration of a charging device by providing a measuring device for measuring the potential on the surface of a photo conductor and controlling the charging device depending on the potential. SOLUTION: In an X-ray device formed of a photo conductor 1 for converting X-ray into a charge pattern, and controllable devices 3, 9 for charging the surface of the photo conductor to a prescribed potential, this device has a measuring device 8 for measuring the potential on the surface of the photo conductor 1 and controlling the charging devices depending on the potential. The charging devices 3, 9 are controlled depending on the potential on the surface of the photo conductor measured by the measuring device 8. Consequently, the charging devices 3, 9 are ON only for a time required to attain a prescribed potential, and a higher X-ray exposing speed can be provided. The measuring device is operated when the charging devices 3, 9 are ON only for a period until the surface of the photo conductor 1 reaches a prescribed potential again after discharged by the imparted quantity, the operating time of the charging devices 3, 9 is shortened, and the life can be extended.
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