| 摘要 |
In order to detect a rise angle of a bed of an X-ray fluoroscopic imaging system, first and second potentiometers of the identical characteristic are respectively connected to a sprocket for rotating a sector gear to raise the bed and a tension roller which is rotated in synchronism with rotation of the sprocket through a chain. Outputs from the first and second potentiometers are input to a differential amplifier to calculate a difference therebetween. It is determined by a window comparator whether or not the difference falls within a predetermined allowable range. When the difference falls outside the predetermined allowable range, an error is detected. The outputs from the first and second potentiometers are input to minimum and maximum voltage detection comparators. It is checked whether or not the output itself from the potentiometer falls within a predetermined output range. If the output falls outside the predetermined output range, an error is detected.
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