Canon Vizcam 1000, Service Manual

Page: 34 / 840

2. COPYING PROCESS
COPYRIGHT © 2001 CANON INC. CANON CLC1000/1000S/3100 REV.2 MAY 2001 PRINTED IN JAPAN (IMPRIME AU JAPON)
2-4
D. Primary Charging (step 2)
Figure 2-105
The negative corona of the primary charging
assembly charges the surface of the
photosensitive drum to a uniform negative
potential, establishing primary potential.
Since the surface potential of the charged
photosensitive drum is determined by the potential
of the grid, a bias is applied to the grid to ensure a
specific drum surface potential.
E. Laser Exposure (step 3)
Figure 2-106
A laser beam of an intensity suited to the
image density of the original is directed to the
surface of the photosensitive drum, thereby
neutralizing the charges on the surface. Such
areas are called the light areas of the
photosensitive drum and will later attract toner in
step 4 (development).
Photosensitive
drum
-
-
-
-
+
+
+
+
Primary
charging
assembly
Grid wire
Light area
Laser beam
Dark area