Operation; Overview; Laser Exposure Process - Konica Minolta magicolor 5550 Service Manual

7. Write section
7.2

Operation

7.2.1

Overview

• Four semiconductor lasers provided, one for each of the four different colors. A single
polygon motor is used to make a scan motion.
• Each photo conductor is irradiated with a laser light so that an electrostatic latent image
is formed on it.
NOTE
• The magicolor 5430 DL/5440 DL/5450 uses a different PH unit than does the magi-
color 5550/5570. When replacing the PH unit, be sure to use the PH unit for the
appropriate model. Using the incorrect PH unit will adversely affect image quality.
7.2.2

Laser exposure process

1. The laser light emitted by each of the semiconductor laser/Y, M, C, and K is
reflected onto the polygon mirror via the synthetic mirror.
2. Since the angle of incidence for each color of laser light varies, the laser light
reflected by the polygon mirror is reflected at a different angle for each color.
3. The condensing angle of each color of laser light is corrected by the G1 lens before
reaching each return mirror.
4. The K laser light is condensed on the surface of the photo conductor through the
separation mirror and G2 lens.
5. The Y, M, or C laser light is condensed on the photo conductor through the separa-
tion mirror, G2 lens, and return mirror.
Index sensor
G1 lens
Polygon mirror
Semiconductor
laser
Photo conductor
Return mirror/2nd
G2 lens
12
Y
M
C
K
Synthetic mirror
Y M
M
Y
Y
Theory of operation Ver. 1.0 Nov. 2006
Y
M
K
C
C
K
C
K
C
K
M
SOS lens
Separation mirror
Return mirror/1st