Canon ImageRUNNER 1022iF, Руководство по обслуживанию, Страница: 92 / 270

Chapter 5
5-2
5.1.2 Main Components
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/ / / / iR1018 / iR1018J / / iR1022A / iR1022F / iR1022i / iR1022iF /
The laser scanner unit consists of the following major components:
- laser unit, which serves as the source of laser beam.
- laser scanner motor, equipped with a 4-face mirror for laser scanning.
- laser driver/BD PCB used to detect laser beam or to control emission of laser beam.
The laser beam generated by the laser unit based on the signals from the DC controller PCB moves through the collimator lens (inside the laser unit) and the cylin-
drical lens to reach a 4-face polygon mirror rotating at a constant speed.
When reflected by the 4-face polygon mirror, the laser beam moves through the imaging lens, and is bent by the reflecting mirror to reach the photosensitive drum.
At this time, the laser beam also is directed to the BD circuit of the laser driver/BD PCB.
As the 4-face polygon mirror rotates at a constant speed, the laser beam scans the surface of the photosensitive drum at a constant speed, thereby removing charges
and forming static images.
F-5-1
Laser driver/BD PCB
Cylindrical
lens
Laser scanner motor
4-face mirror
BD block
Photosensitive drum
Image processor PCB
Laser beamdetection
signal (BDI*)
Laser scanner motor dr
iv
e signal (A
CC*)
Laser dr
iv
er
control signal (CTRL0, CTRL1, CTRL2
Image signal (VDO
,VDO*)
Hor
iz
ontal sync
signal (BDO*) Comm
unication
control
DC controller PCB
- copy image data
- print image data
(if equipped with printer functions)
- fax image data
(if equipped with fax functions)