Operation; Outline; Laser Exposure Process - Konica Minolta magicolor 2480MF Service Manual

Theory of Operation Ver. 1.0 Nov. 2005
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.
Beam A
Beam B
Direction of Rotation
of Photo Conductor
Laser Diode
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 con-
stant for each line of main scan.
Photo Conductor
Beam A
Beam B
Photo
Conductor
G2 Lens
G1 Lens
Return Mirror
8. Write section (PH section)
Photo Conductor Surface
Semiconductor Laser
SOS Board
Polygon Motor
4139to2051e0
4139to2052e0
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