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4-8
FS-1010
Laser scanner unit
Name Description
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.
3
2
5
4
6
1
Diversion mirror
Figure 4-1-6 Laser scanner unit