Konica Minolta Magicolor 2490 MF, Руководство по обслуживанию

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Theory of operation ver. 1.0 July. 2006 8. Write section (PH section)
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magicolor 2490MF
Composition/Operation
8.2 Operation
8.2.1 Outline
• The surface of the photo conductor is irradiated with a laser light and an electrostatic
latent image is thereby formed.
• The polygon mirror has four faces. The machine uses a two-beam array LD to inhibit the
speed of the polygon mirror from increasing because of the decreased number of faces
the polygon mirror has as compared with the conventional models.
• The two-beam array LD consists of two LD elements arranged vertically. Two lines are
scanned with two laser beams emitted from these two LD elements through a single face
of the polygon mirror.
8.2.2 Laser exposure process
1. The laser light emitted from the semiconductor laser strikes the polygon mirror.
2. The polygon mirror with four faces is rotated at high speeds by the polygon motor.
3. The SOS sensor ensures that the laser light emission start timing remains constant
for each line of main scan.
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Photo
Conductor
Polygon Mirror
Laser Diode
Beam A
T
w
o lines are
scanned in a single
scan motion.
Photo Conductor Surface
Direction of Rotation of Photo Conductor
Direction of Rotation
of Photo Conductor
Beam B
Beam A
Beam B
Return Mirror
G2 Lens
G1 Lens
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Photo Conductor
Semiconductor Laser
SOS Board
Polygon Motor