I. BASIC OPERATIONSA. Varying the Reproduction RatioThe reproduction ratio in the axial direction of the drum is varied by the lens drivesystem, and the reproduction ratio in the drum peripheral direction is varied by thescanner drive system and the main drive system.The lens drive system uses a zoom lens; as shown in Figure 3-101, the position ofthe lens and the focal distance are changed to vary the reproduction ratio in the axialdirection of the drum.The scanner drive system moves the No. 1 mirror relatively faster (reduction) orslower (enlargement) than the peripheral speed of the drum to vary the reproductionratio in the peripheral direction of the drum.Reference:In Direct mode, the relative speed of the No. 1 mirror and the peripheral speed ofthe drum are the same.Figure 3-101DirectReduceEnlargeF2F1FF2’F1’F’COPYRIGHT © 1997 CANON INC. CANON NP6045 REV. 1 MAR. 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)CHAPTER 3 EXPOSURE SYSTEM3-1
