Lens Drive System; Outline Of The Movement - Canon NP6251 Service Manual

CHAPTER 3 EXPOSURE SYSTEM
II. LENS DRIVE SYSTEM
A. Movement of the Lens

1. Outline of the Movement

The copier uses center reference, in which copy paper is picked up and fed in
relation to the center of the feeding paths and originals are placed in relation to the rear
of the machine (when using the copyboard cover). As such, the lens is moved in Y
(vertical) direction even in Direct mode to suit the width of copy paper.
Using the Copyboard Cover
The RDF installed to the machine uses center reference; when the size of the
original and the size of the copy paper are identical in Direct mode, the lens is not moved
in Y (vertical) direction (Figure 3-202).
If the size of the original and the size of the paper are different, on the other hand,
or in Reduce/Enlarge mode, the lens is moved in Y (vertical) direction so that the image
on the copy paper will be correct.
Using the RDF
3-2
COPYRIGHT © 1997 CANON INC.
Lens position (Direct)
for copy paper (small)
Original
(small)
Original
(large)
Lens position (Direct)
for copy paper (large)
Figure 3-201 (top view)
Lens
Original
(large)
Original
(small)
Figure 3-202 (top view)
CANON NP6350/NP6251 REV. 0 JULY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
Copy paper
(large)
Original
(small)
Coy paper (large)
Copy paper
(small)