Static Latent Image Formation Block; Pre-Exposure (Step 1) - Canon NP6330 Service Manual

B. Static Latent Image Formation Block
The static latent image formation block consists of three steps, at the end of which
negative charges are left in the areas of the photosensitive drum corresponding to the
black areas of an original while removing negative charges from the areas of the
photosensitive drum corresponding to the white areas of the original.
The static image formed on the photosensitive drum is not visible to the human eye
and, therefore, is called a static latent image.
C. Pre-Exposure (step 1)
In preparation for primary charging, the light from the pre-exposure lamp is shone
on the photosensitive drum surface, thereby removing the residual charges from the
photosensitive drum surface and, ultimately, preventing uneven copy density.
COPYRIGHT © 1997 CANON INC.
Time (t)
0
500
Pre-exposure
Primary charging
(step 1)
(step 2)
Figure 1-604
Pre-exposure lamp
Figure 1-605
CANON NP6330 REV.0 MAY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 1 GENERAL DESCRIPTION
Dark area
Light area
Image exposure (step 3)
1-23