| 摘要 |
PURPOSE:To synchronize a drum and a scanning optical system with each other in a transfer type electrophotographic copying machine, by measuring the turning speed of the drum and by controlling the speed of the scanning optical system according to the measured value. CONSTITUTION:A photosensitive drum and a scanning optical system are driven by different driving sources. A light shielding disk turning together with the drum cuts off an optical path to obtain pulses, thereby detecting the turning angle of the drum. The turning speed of the drum is known by finding how many pulses are obtained within a certain time, and in a next turn, the drum speed is estimated. The rising speed of the scanning optical system and its speed in equal-speed scanning are controlled to obtain the estimated drum speed. |
