Chapter 5 Laser Exposure System; Overview - Canon GP160F Service Manual

I. OVERVIEW
The principal parts making up the laser scanner unit are; the laser beam generating
laser unit, the laser scanner motor which contains a six sided mirror for laser scanning
and a BD sensor PCB for detection the laser beam.
The laser beam generated by the laser unit illuminates the 6 sided mirror, which
rotates at a fixed speed. The laser beam reflected by the 6 sided mirror is filtered
through a condensing lens in order to be focussed on the photosensitive drum. The optic
path is bent by the lens mirror, and the beam arrives at the photosensitive drum. Then,
the laser beam reflected by the BD mirror installed in the laser scanner unit is illuminat-
ed onto the BD sensor PCB. (Refer to Figure 5-102)
When the 6 sided mirror is rotating at a fixed speed, the laser beam is scanned onto
the photosensitive drum at a fixed speed, the static charge eliminated and then an elec-
trostatic latent image formed.
Mirror 2
Mirror 3
Image processor
PCB
Analog processor PCB
DC controller
PCB
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Copyboard glass
Scanning lamp
Mirror 1
Lens
CCD light receiving unit
Laser
driver
Laser scanner unit
Figure 5-101
CANON GP160 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)

CHAPTER 5 LASER EXPOSURE SYSTEM

Mirror 4
Laser mirror
Laser beam
Photo-
sensitive
drum
5-1