Laser Exposure System; Laser Processing Unit - Oce 3121 Technical & Service Manual

Laser Exposure System

1 Laser Processing Unit

Outline
The main components of the laser unit are:
a laser unit, as the source of laser beams
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a scanner motor, which is equipped with a 6-facet mirror
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a BD detection PBA, for the detection of the laser beams.
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The laser beam generated by the laser unit is directed to the 6-facet mirror. The
mirror rotates at a specific speed. The laser beam reflected by the mirror is
passed through the imaging lens. The optical path is bent by the laser mirror
before it reaches the photosensitive drum. Meanwhile, the laser beam is bent
to an acute angle by the BD mirror, located inside the laser unit. This is for the
BD detection PBA.
As the mirror rotates, the laser beam scans the surface of the OPC. This re-
moves charges and, as a result, creates a latent image.
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