| 摘要 |
PROBLEM TO BE SOLVED: To provide a clearance distance measuring method which calculates a clearance distance between members such as that between a roller and a photosensitive body in a wet type electrophotographic apparatus. SOLUTION: In this method, when a member B identical to a member A as electric resistor or conductor is set with a fine clearance made from the surface of the member A, a clearance distance between the members A and B is calculated from a voltage-current characteristic previously in a fixed relationship. To be more specific, an electrophotographic apparatus has a system in which a voltage is applied to a roller-shaped member B (such as set roller 4) set at a fixed distance from a photosensitive body 1 as member A. In this case, a discharge start voltage is determined by measuring the voltage applied to the roller-shaped member and the current flowing utilizing a fixed relationship existing between the clearance distance between the photosensitive body and the roller-shaped member and the discharge start voltage and a distance between the photosensitive body and the roller-shaped member is measured from a relational expression previously computed. |
