Cylindrical Lens; Polygon Mirror - Ricoh A66 Service Manual

LASER EXPOSURE
[C]
[B]
[A]

5.2.2 Cylindrical Lens

The laser beam is focused by the cylindrical lens [A], and sent to the polygon
mirror.

5.2.3 Polygon Mirror

The polygon mirror assembly consists of the polygon motor [B] and the
polygon mirror itself [C].
As the mirror rotates, it reflects the laser beam across the drum, via the
f-theta lens, BTL, and drum mirror. One main scan line is made by the beam
reflected from one face of the polygon mirror.
The mirror is precisely ground to enable high reflectivity and to prevent pixel
misalignment on the drum in both the main scan and sub scan directions.
The polygon mirror motor rotates at 16,535 rpm. One rotation of the polygon
mirror corresponds to six main scans.
SM 2-67 A166/A187/A189