| 摘要 |
PURPOSE:To enable the image formation from the home position of a drum, by comparing the timing for arriving of a rotating drum at a prescribed angle position when a beam approaches the prescribed distance at the end of a photosensitive drum and suspending the scanning for the 1st line if there is too much space. CONSTITUTION:The latent image on a photosensitive drum 8 is developed with toners of three primary colors YMC, and is transferred three times superposedly on the same sheet, whereby a color copy is obtd. When the home position 11 of the drum is detected within the prescribed time after arrival of the beam 7 of a laser 5 deflected by a mirror 6 at a prescribed position 10, the beam is modulated by an image signal from the point apart by l from the position 10 for the beginning end of the beam, and the formation of the image is started. When the timings for both detection are apart too much, the formation of the image is stopped in the scanning of that time and the scanning is accomplished from the next second line. Since the pitch of the lines is small, there is no influence on the image quality even if one line is dropped out. |
