| 摘要 |
PURPOSE:To make the blackening degree of a photographed X-ray film uniform by detecting the position where a white zone is generated and actuating a relay, and causing a lamp current to increase and correcting the lowering of the lamp current accompanied with this. CONSTITUTION:When a turning arm is turned and an arcuate row of teeth is projected on a X-ray film and the X-rays from an X-ray bulb 7 are irradiated on a front teeth portion through the cervical vertebrae and the X-rays reach to a which zone region, the position of this X-ray device is detected by ON of a phototransistor, and a relay coil 13 is energized by a control circuit 14. Whereby, respective relay contacts of a lamp voltage regulating circuit 5 and a lamp current regulating circuit 10 are changed to short-circuit respective resistors for regulating, and the lamp current of the bulb 7 is increased, and the lowering of the lamp voltage accompanied by this increase is corrected. As a result, it is possible to make the blackening degree of the arcuate row of teeth and the continuously photographed X-ray film uniform. |
