2G6
2-1-11
(3-1) Laser scanner unit
Diversion mirror
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 pin photo 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 2-1-11 Laser scanner unit
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