Table of Contents
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No.
Component
(1)
Semiconductor laser
(2)
Collimator lens
Polygon mirror,
(3)
polygon motor
BD (Mirror, lens,
(4)
PWB)
(5)
fθ lens
Makes the laser scanning speeds at both ends of the drum same as
each other.
a ≠ b ≠ c
a
b
c
B. Laser beam path
C. Composition
Effective scanning width:
216mm (max.)
Resolution:
600dpi
Beam diameter:
75um in the main scanning
direction, 80um in the sub scanning
direction
0.20 ±0.03mW (Laser wavelength
Image surface power:
780 – 795nm)
Brushless motor 20.787rpm
Polygon motor section:
No. of mirror surfaces: 6 surfaces
Function
Generates laser beams.
Converges laser beams in
parallel.
Reflects laser beams at a
constant rpm.
Detects start timing of laser
scanning.
Converges laser beams at a
spot on the drum.
Makes the laser scanning
speeds at both ends of the
drum same as each other.
(Refer to the figure below.)
d = e = f
d
e
f
θ LENS
f
4. Fuser section
A. General description
General block diagram (cross section)
Thermal fuse
Thermistor
Heat roller
Top view
Thermistor
Heat roller
(1) Heat roller
A Teflon roller is used for the heat roller and a silicone rubber roller is
used for the lower heat roller for better toner fusing performance and
paper separation.
(2) Separator pawl
Three separator pawls are used on the upper heat roller. The separator
pawls are teflon coated to reduce friction with the roller and prevent a
smear on the paper caused by the separator pawl.
7 – 3
DP1200/1500
Separator pawl
PPD2
Pressure roller
Paper guide
Thermal fuse
Heater lamp
Separator pawl
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