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CHAPTER 3 EXPOSURE SYSTEM
I. BASIC OPERATION
A. Varying the Reproduction Ratio
The reproduction ratio across the photosensitive drum is varied by the lens drive system; on the other hand, the ratio around the drum is varied by the scanner drive system. The lens drive system uses a zoom lens; as shown in Figure 3-101, the position and focal distance of the lens are changed to vary the reproduction ratio across the photosensitive drum. The scanner drive system varies the reproduction ratio around the photosensitive drum by moving the No. 1 mirror relatively faster (reduction) or slower (enlargement) than the peripheral speed of the photosensitive drum.
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