Exposure Stage - Brother HL1060 - B/W Laser Printer Service Manual

2.5.2

Exposure Stage

After the drum is positively charged, it is exposed to the light emitted from the laser unit.
Laser detector
Laser diode
The area exposed to the laser beam is the image to be printed. The surface potential of the
exposed area is
+1000
+700
+400
Drum +300
Sleeve
Drum
Paper
Laser beam
f lens
Polygon mirror
Motor
Lens
Fig. 2.26
reduced forming the electrostatic image to be printed.
1 Cycle of drum
1 2
(a)
(b)
Fig. 2.27
CHAPTER II -21
1
3 4
2
3
4
Time
Laser Beam
Primary charging
Laser beam exposure and developing
(a) Unexposed area
( Non image area )
(b) Exposed area
( Image area )
Transfer the image to paper
Erase the residual potential