#Part
1 Polygon printhead
1 LD card assembly — This generates the laser beam. The beam is turned on or o according to a print data
signal coming from the system card.
2 Printhead motor/polygon mirror — The polygon mirror is mounted to the shaft of the printhead motor, and
is rotated at a high speed by the printhead motor. The mirror rotation shifts the incidence and
reflection
angles of a laser beam to scan the photoconductor (drum) in a single direction. The laser beam reaches the
polygon mirror as it passes through multiple lenses, mirrors, and windows. The laser beam then arrives at
the photo conductor (drum) surface.
3 SOS card assembly —When a laser beam hits the SOS sensor on the SOS card assembly, the beam is
converted to an electrical signal (SOS signal), and detects the initial position where a scan starts on each
line.
4062
Appendix C: Theory of operation
528
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