| 摘要 |
PROBLEM TO BE SOLVED: To provide a rotation driving device which can respond to resource saving by reducing the weight and permits highly accurate rotation driving of a rotated body.SOLUTION: A photoreceptor driving device 10 includes a motor 20, a planetary gear speed reducer 30 and a drum shaft 50 which transmits a rotation driving force outputted from an output shaft 40 of the planetary gear speed reducer 30 to a photoreceptor drum 1 and, therein, an inner teeth gear 32 of the planetary gear speed reducer 30 is made of resin. Further, a disk 81 for encoder of a speed detection means 80 is disposed concentrically on the output shaft 40 and two sensors 82 for encoder are supported on a mounting part 83 integrally formed near an edge part of the photoreceptor drum 1 side of the inner teeth gear 32. |
