Ricoh OP-P1 Service Training page 68

 The laser diode [1] emits a single laser beam.
 A collimating lens [2] shapes the laser beam, which then passes
through the aperture [3] and cylindrical lens [4]. The aperture and
cylindrical lens focus the beam and aim it at the polygon mirror.
 The polygon mirror [5] rotates clockwise at a very high but
constant speed.
 When the laser beam strikes a face of the mirror, the mirror
surface reflects the beam across the photoconductor surface of
the drum after passing through more lenses and mirrors.
Slide 68
No additional notes
Laser Unit Operation (1)
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OP-P1/MF1 Training