| 摘要 |
PROBLEM TO BE SOLVED: To provide an electrophotographic printer whose surface potential can be held constant even if the photosensitive film on the surface of a photosensitive drum wears. SOLUTION: The electrophotographic printer has a power source 3 for electrostatic charging, an electrophotographic charging roller 1, the photosensitive drum 2, an electrostatic discharging means 11, an electrostatic charging current observing means 4, an arithmetic and control means 12, and a storage means 13. The arithmetic and control means 12 rotates the photosensitive drum a plurality of times in initial operation while the electrostatic charging means 4 is turned off to make the power source for electrostatic charging generate an electrostatic charging voltage -Vmc as a voltage desired to be obtained as the surface potential -Vsf of the photosensitive drum and integrates and stores it in the storage means while the photosensitive drum is rotated the plurality of times and rotates the photosensitive drum in printing while the electrostatic charging means is turned on and controls the electrostatic charging voltage outputted from the power source for electrostatic charging so that the electrostatic charging current reaches the value stored in the storage means. |
