I. OUTLINE OF OPERATIONA. Varying the Reproduction RatioThe reproduction ratio in the axial direction of the drum is varied by the lens drivesystem, while that in the peripheral direction of the drum is varied by the scanner drivesystem and the main drive system.The lens drive system uses a zoom lens, which varies the reproduction ratio in thedrum axial direction by changing the focal distance and the position of the lens as shownin Figure 3-101.The scanner drive system varies the reproduction ratio in the peripheral direction ofthe drum by moving the No. mirror faster (for reduction) or slower (for enlargement).Reference:1. The copier will not move the mirror to suit any reproduction.2. The peripheral speed of the drum is the same as the speed of the movement ofthe mirror in Direct.Figure 3-101DirectReduceEnlargeF2F1FF2'F1'F'COPYRIGHT © 1997 CANON INC. CANON NP6350/NP6251 REV. 0 JULY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)CHAPTER 3 EXPOSURE SYSTEM3-1
