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Technical Explanation > Laser Exposure System > Controls > Horizontal scanning synchronous control
Technical Explanation > Laser Exposure System > Controls > Horizontal scanning synchronous control
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Horizontal scanning synchronous control
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Purpose
Aligns the write start position in the horizontal scanning direction.
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Execution Timing
When printing is started (for each line)
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Control description
1) The Y/M Laser Driver PCB forcibly emits the Bk laser diode of the C/Bk Laser Driver PCB
by setting the Bk laser control signal to APC mode.
2) The laser beam of the Bk laser has a BD circuit in the scanning light path, and is incident
on the BD Circuit.
3) The BD Circuit detects the laser beam and generates a BD signal, and sends it to the Main
Controller.
4) The Main Controller synchronizes with this signal, and sends video signals (Y_VDO, M_
VDO, C_VDO and Bk_VDO) to the Y/M and C/Bk Laser Driver PCBs while regarding the
reference BD signal as the vertical scanning synchronous signal (BD) for each line. This
enables each Laser Driver PCB to emit a laser beam from a fixed position for each line.
NOTE:
• As the BD signal is the horizontal scanning synchronous signal of the Bk color, the Bk
color serves as each color's reference for horizontal scanning.
• With this machine, the reference in the horizontal scanning direction for Y and M colors is
the right edge (right-to-left) while that for C and Bk colors is the left edge (left-to-right).
<Y, M color>
<C, Bk color>
Right standard
Left standard
Feeding
direction
F-2-38
Y_VDO
M_VDO
C_VDO
Bk_VDO
Main Controller
PCB(UN05)
Y Laser
M Laser
C Laser
Bk Laser
BD Signal
C/K Laser Driver PCB
(UN09)
BD Sensor
Y/M Laser Driver
PCB(UN08)
ASIC
APC Signal
F-2-39