II. EXPOSURE SYSTEM
A. Varying the Reproduction
Ratio
The reproduction ratio in the drum axial direc-
tion is varied by the lens drive system, and that in
the drum peripheral direction is by the scanner
system and the main drive system.
The lens drive system uses a zoom lens; and,
as shown in Figure 3-201, the lens position and
focal distance are changed to vary the reproduc-
tion ratio in the drum axial position.
The scanner drive system moves the No. 1
mirror relatively faster (reduction) or slower
(enlargement) than the peripheral speed of the
drum, to vary the reproduction ratio in the drum
peripheral direction.
Reference:
The speed of the No. 1 mirror and the
peripheral speed of the drum are identical
in Direct mode.
Figure 3-201
B. Lens Drive System
1. Outline of the Lens Drive System
The NP6085 uses center reference to move
copy paper. Since the original is placed using rear
reference (with copyboard cover in use), however,
the lens is moved in Y (vertical) direction accord-
ing to the width of the copy paper even in Direct
mode.
■
Copyboard Cover in Use
Figure 3-202 (top view)
Moreover, since the RDF installed to the
NP6085 uses center reference, the lens is not
moved in Y (vertical) direction if the original size
and the copy size are the same and Direct mode
is used (Figure 3-203). However, if the original
size and the copy size are different, the lens is
moved in X (horizontal) direction so that the
image on the copy will be as in the case of when
the copyboard cover is used.
■
RDF/ADF in Use
Figure 3-203 (top view)
3. OPERATIONS AND TIMING
COPYRIGHT © 1996 CANON INC.
CANON NP6085 REV.0 JULY 1996 PRINTED IN JAPAN (IMPRIME AU JAPON)
3-30
Direct
Reduce
Enlarge
F2
F1
F
F2'
F1'
F'
Original
(small)
Original
(large)
Copy
paper
(small)
Lens position for S copy paper
Lens position (Direct) for
L copy paper
Copy paper
(large)
Y direction
Original
(small)
Original
(large)
Copy
paper
(small)
Lens
Copy paper
(large)
X direction
Y direction
Содержание NP6085
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Страница 498: ...COPYRIGHT 1996 CANON INC CANON NP6085 REV 0 JULY 1996 PRINTED IN JAPAN IMPRIME AU JAPON A 5 ...
Страница 502: ...PRINTED IN JAPAN IMPRIME AU JAPON 0697AB0 6 3 This publication is printed on 70 reprocessed paper ...