Chapter 3 Exposure System; Basic Operation; Changing The Reproduction Ratio - Canon NP6320 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. 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 is varied to change the
reproduction ratio across the drum.
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 is mirror 1 plus
the scanning lamp.)
The mirror speed is faster than the drum peripheral speed for reduction and slower for enlarge-
ment.
Note:
1. The relative position of the mirrors is not changed to vary the reproduction ratio.
2. For Direct copying, the speed of the mirror is the same as the peripheral speed of the drum.
COPYRIGHT © 1999 CANON INC.
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DIRECT
REDUCTION
ENLARGEMENT
F2
Figure 3-101
CANON NP6320 REV.0 DEC. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)

CHAPTER 3 EXPOSURE SYSTEM

F'
F
F1'
F1
F2'
3-1