Canon NP6012F - Controlling the Side Blank Exposure

J. Controlling the Side Blank
Exposure
1. Outline
The copier is equipped with a side blank
exposure lamp at the front and the rear to
prevent adhesion of toner to the drum when
reduced copies are made.
2. Operation
The side blank exposure lamp moves
based on the travel distance of the lens as
measured by the lens travel detecting shaft
for reduced copies for blanking out the non-
image areas.
Rear side blank exposure lamp
Lens travel detecting shaft
Reflecting plate
/
Front side blank exposure lamp
Reflecting plate
(front)
Figure 3-330
A +
B
B + A
Photosensitive drum
L Non-image area (REDUCE) i
A : position of the side blank exposure lamp at time of DIRECT/ENLARGE.
, B : position of the side blank exposure lamp at time of REDUCE
Figure 3-331
3 - 44
COPYRIGHT Q 1945 CANON UK.
CANON NP6012fNP6012PI NP6212 REV.1 SEPT. 1995 PRINTED IN JAPAN (IMPRIM~ AU JAPON)