Canon ImageRunner iR8500 Series, Руководство по обслуживанию, Страница: 323 / 1122

Chapter 7
7-1
7.1 Construction
7.1.1 Outline of the Laser Exposure System
0007-0533
iR105i/iR105+ / iR9070
The laser exposure system consists of a laser unit (source of laser beams) and a polygon mirror. It scans the photosensitive drum (main scanning direction)
to create a latent static image. It is a twin-laser mechanism (laser A, laser B).
F-7-1
T-7-1
7.1.2 Outline of the Laser Exposure System
0008-7437
/ iR85+ / iR8070
The laser exposure system consists of a laser unit (source of laser beams) and a polygon mirror. It scans the photosensitive drum (main scanning direction)
to create a latent static image. It is a twin-laser mechanism (laser A, laser B).
Component Description
Laser semi-conductor Visible laser light (wave length: 675 nm; output: 7 mW),
twin-laser exposure
Laser scanner motor (M4) DC motor, 2-speed control; rotation speed: 44000 rpm
Polygon mirror 8-face
BD mirror/BD PCB Used to detect laser beams.
Laser driver PCB Used to control laser activation.
Scanner motor driver PCB Used to control the rotation of the laser scanner motor.
Photosensitive drum
BD PCB
BD mirror
8-face mirror
Laser scanner motor
Collimating lens
Laser unit
Laser mirror
Laser driver PCB
80µm
18 pixels (760 µm)
Laser A
Laser A
Laser B
Laser B