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Technical Explanation > Laser Exposure System > Controls > Laser scanner motor control
Technical Explanation > Laser Exposure System > Controls > Laser scanner motor control
■
Image mask control
●
Purpose
Prevents soiling of the Secondary Transfer Outer Roller.
Image mask control is carried out at horizontal scanning and vertical scanning, respectively,
to avoid laser beams from emitting outside of the image area.
●
Execution Timing
At power-on, and at each print
Type
Control description
Mask Width
Horizontal scanning The image mask in the horizontal scanning direction is executed
based on the paper size selected by the user. (Each color's BD
signal is the reference)
2 mm
Vertical scanning
The image mask in the vertical scanning direction is executed
based on the paper size selected by the user. (TOP signal is the
reference)
2 mm
Feeding direction
Vertical
scanning
Horizontal
scanning
2.5mm
2.5mm
4mm
2.5mm
/TOP
BD Y
BD M
BD C
BD Bk
T1
T2
T4
T3
・
is image mask disable area (image written available) .
・
T1
、
T2
、
T4 are differ by paper size.
・
T3 is differ by feeding control.
T1
T-2-15
F-2-41
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Laser scanner motor control
●
Purpose
Rotates the Scanner Motor at a specific speed.
●
Execution Timing
At power-on, and at each print
●
Control description
Scanner Motor rotation speed is controlled by the Y/M Laser Driver PCB.
1) The Y/M Laser Driver PCB outputs Scanner Motor control signals (acceleration signal:
ACC, deceleration signal: DEC) to the Scanner Motor to rotate the Polygon Mirror.
2) The Y/M Laser Driver PCB controls the Scanner Motor rotation speed to be constant by
reference to the Scanner Motor rotation speed signal (FG signal).
(From when the Scanner Motor starts rotation until it reaches the target revolutions and the
machine starts image formation process)
3) When the laser beams are emitted at image formation, the BD Sensor of the C/Bk Laser
Driver PCB detects the BD signal and inputs it to the Y/M Laser Driver PCB.
4) The Y/M Laser Driver PCB controls the Scanner Motor control signals (acceleration signal:
ACC, deceleration signal: DEC) based on the input timing of the BD signal to control the
Scanner Motor rotation speed.
Y Laser
M Laser
C Laser
Bk Laser
BD
ACC
DEC
FG
BD Sensor
Scanner
Monitor
C/Bk Laser
Driver PCB
(UN09)
Y/Mk Laser
Driver PCB
(UN08)
ASIC
F-2-42