Brother International HL 1850 Service Manual - Page 100
Exposure, stage, After, positively, charged, exposed, light, emitted, laser, unit., image, printed
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CHAPTER 3 THEORY OF OPERATION 2.6.2 Exposure stage After the drum is positively charged, it is exposed to the light emitted from the laser unit. Laser detector Laser diode Drum Paper Laser beam --•-t --- f 0 lens 0 Polygon mirror Laser beam ••e e e I:6-i-•6•..-6i Lens Motor Fig. 3-31 The area exposed to the laser beam is the image to be printed. The surface potential of the exposed area is reduced, forming the electrostatic image to be printed. Surface Potential (V) 1 +870 • +400 • +150 • 1 Cycle of drum ® i (b) T Primary charging © Laser beam exposure and developing (a) Unexposed area ( Non image area ) (b) Exposed area ( Image area) Transfer the image to paper Drum Sleeve 0 Time -."-Fig. 3-32 3-28
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CHAPTER
3
THEORY
OF
OPERATION
2.6.2
Exposure
stage
After
the
drum
is
positively
charged,
it
is
exposed
to
the
light
emitted
from
the
laser
unit.
Laser
detector
Laser
diode
Drum
--•t
----
Lens
0
Paper
Laser
beam
f
0
lens
Polygon
mirror
Motor
Fig.
3-31
Laser
beam
eee
I
666
•
.
•
•
...•
.:
•.
•
••
•••
••
• • •
.
• •
••
.
••••
•..
•.
•
.
•
• • ••
.
•
-
i
-
-
i
-
•
• •
•
• •
The
area
exposed
to
the
laser
beam
is
the
image
to
be
printed.
The
surface
potential
of
the
exposed
area
is
reduced,
forming
the
electrostatic
image
to
be
printed.
Surface
Potential
(V)
1
+870
•
+400
•
+150
•
Drum
Sleeve
0
1
Cycle
of
drum
®
(b)
i
Time
—."--
Fig.
3-32
T
©
Primary
charging
Laser
beam
exposure
and
developing
(a)
Unexposed
area
(
Non
image
area
)
(b)
Exposed
area
(
Image
area)
Transfer
the
image
to
paper
3-28