2GM
2-1-12
(3-1) Laser scanner unit
3
2
5
4
1
Diversion mirror
6
1 Laser diode ................................................... Emits diffused, visible laser.
2 Cylindrical lens .............................................. Compensates the vertical angle at which the laser beam hits a polygon
mirror segment.
3 Polygon mirror (motor) .................................. Has six mirror segments around its hexagonal circumference; each
mirror corresponding to one scanned line width on the drum when laser
beam scans on it.
4 F-theta lens ................................................... The f-theta lens equalizes focusing distortion on the far ends of the
drum.
5 Sensor mirror ................................................ Bends the very first shot of a laser scan towards the beam detection
sensor (6).
6 Pin photo sensor ........................................... When shone by the sensor mirror above, this photo-sensor generates
a trigger signal for the engine controller to start activating the paper
feeding system.
Figure 2-1-12 Laser scanner unit
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