Table of Contents
Advertisement
rs
OPEN ATION
AND TIMING RR
li. EXPOSURE SYSTEM
A. Varying the Reproduction
Ratio
The reproduction ratio in the direction of
the drum axis is varied by the lens drive sys-
tem and that around the drum, by the scan-
ner drive system.
The lens drive system holds a lens array
and changes the location of the lens and the
optical path length as shown in Figure 3-201
fo vary the reproduction ratio in the direction
of the drum axis; the length of the optical
path is changed by moving the No. 4 and
No. 5 mirror units as shown in Figure 3-202.
The scanner drive system changes the
reproduction ratio around the drum by mov-
ing the No. 1 mirror faster (reduction) or
slower (enlargement) relative to the periph-
eral speed of the drum.
Reference:
1. In DIRECT, the speed at which the
No. 1 mirror is moved is the same as
the peripheral speed of the drum.
2. The length of the optical path is longer
in both REDUCE and ENLARGE than
in DIRECT.
COPYRIGHT © 1995 CANONINC.
CANON NPGO12/NP6O12F / NP6212 REV.1 SEPT. 1995 PRINTED IN JAPAN (IMPRIME AU JAPON}
DIRECT
Optical
pam
|
>
length
RE-
ia
DUCE
:
Optical
ath
|
length
EN-
LARGE
F
Optical
eal
length
Optical path: L1< L2, L1< L3
il
">|
L3
Figure 3-201
3-11
Advertisement
Chapters
Table of Contents
