Chapter 3 Exposure System; Basic Operation; Changing The Reproduction Ratio - Canon NP6317 Service Manual

I.

BASIC OPERATION

A.

Changing the Reproduction Ratio

The reproduction ratio across the drum is varied by changing the position of the lens and the
position of No. 4 and No. 5 mirrors. It is moved by the lens drive system. The reproduction ratio
around the drum is varied by changing the speed of the scanner. Figure 3-101 shows how the
position of the lens and mirror is varied to change the reproduction ratio across the drum.
100%
50%
200%
The scanner drive system changes the reproduction ratio around the drum by varying the speed
at which mirror 1 moves relative to the peripheral speed of the drum. (The scanner consists of
mirror 1 and the scanning lamp.)
The mirror speed is higher than the drum peripheral speed for REDUCTION and lower for
ENLARGEMENT.
Note:
For DIRECT copying, the speed of the mirror is the same as the peripheral speed of the
drum.
COPYRIGHT © 1999 CANON INC.
Figure 3-101
CANON NP6317 REV.0 APR. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)

CHAPTER 3 EXPOSURE SYSTEM

Lens No. 4/5 mirror
3-1