I. BASIC OPERATIONA. Varying the Reproduction RatioThe ratio in the axial direction of the photosensitive drum is varied by the lens drivesystem, and the ratio in the peripheral direction of the photosensitive drum is varied bythe scanner drive system.The lens drive system uses a zoom lens, and it varies the reproduction ratio in theaxial direction of the photosensitive drum by changing the lens position and the focaldistance.The scanner drive system moves the No.1 mirror relatively faster (Reduce) or slower(Enlarge) than the peripheral speed of the photosensitive drum, thereby varying theperipheral reproduction ratio.Figure 3-101CHAPTER 3 EXPOSURE SYSTEMCOPYRIGHT © 1997 CANON INC. CANON NP6330 REV.0 MAY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON) 3-1DirectReduceEnlargeFF1F2F2´F1´F´
