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Technical Explanation > Laser Exposure System > Various Controls > Laser ON/OFF control
Technical Explanation > Laser Exposure System > Various Controls > Laser ON/OFF control
Various Controls
■ Overview
Item Operation description
Laser ON / OFF control Laser light is turned ON / OFF according to the combination of
laser control signal
Horizontal scanning
synchronous control
To align the writing start position in horizontal scanning direction.
Vertical scanning synchronous
control
To align the writing start position in vertical scanning direction.
Image Mask Control This control prevents the laser beam from being emitted in non-
image area to avoid the Secondary transfer outer Roller from
getting dirt.
Laser scanner motor control To rotate the scanner mirror by the specified speed.
APC control To make the laser light per 1 line consistent amount
BD correction control To correct the gap BD timing gap due to the angle variation of
Scanner Mirror.
Horizontal scanning
synchronous control
Vertical scanning
synchronous control
Image mask control
APC control
BD correction control
Dustproof shutter control
Laser scanner motor control
Laser ON/OFF control
Main
Controller PCB
(UN81)
DC Controller
PCB (UN04)
Laser Scanner Unit
Polygon Motor
Y/M/C/Bk
Laser Driver PCB
(UN05)
T-2-15
F-2-41
■
Laser ON/OFF control
● Purpose
Laser light is turned ON / OFF according to the combination of laser control signal.
● Execution timing
After the power ON
● Control detail
DC Controller switches the 4 modes (forcible OFF mode, APC mode, Print mode and standby
mode) according to the laser control signal.
Main Controller
PCB (UN81)
APC signal
Video signal
ASIC ASIC
DC Controller
PCB (UN04)
CPU
Laser ON
/OFF signal
Polygon Mirror
Laser
Beam
Y/M/C/Bk
Laser Driver PCB
(UN05)
Mode Laser status Remark
Forcible OFF mode OFF Light intensity setting decided on APC is cleared.
APC mode ON Laser light intensity adjustment
Print mode ON / OFF Laser is emitted according to the video signal.
Standby mode OFF Host machine is in standby status.
Mode
name
Standby
mode
APC mode APC mode / Print mode
Forcible
OFF mode
Standby
mode
LaserB
LaserA
PSTBY PSTBY PINTR PRINT
At 1st line (APC)
LSTR
Print
instruction
Image formation
ready timing
At 2nd line (APC)
F-2-42
T-2-16
F-2-43