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