AcuLaser M2000D/M2000DN/M2010D/M2010DN Revision B
OPERATING PRINCIPLES Technical Explanation of Print Process 21
Confidential
2.2.2 Exposure
LASER SCANNER UNIT (LSU)
The charged surface of the drum is then scanned by the laser beam from the laser
scanner unit.
The laser beam (780 nm wavelength) beam is dispersed as the polygon motor revolves
to reflect the laser beam over the drum. Various lenses and mirror are housed in the
laser scanner unit, adjust the diameter of the laser beam, and focalize it at the drum
surface.
Figure 2-8. Exposure section
Figure 2-9. Laser scanner unit
Polygon motor (mirror)
F-
θ
lens
LSU mirror
LSU shutter
LSU flame
LSU cover
LSU mirror
Polygon motor
(mirror)
PD mirrorSOS lens
Pin photo diode
sensor (PD PWB)
Laser diode
(APC PWB)
Callimator
lens
Cylindrical
lens
F-
θ
lens
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