2G4
2-1-6
Figure 2-1-7Laser scanner unit
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 mir-
ror 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 diode sen-
sor ()
6. Pin photo diode sensor ................................ When shone by the sensor mirror above, this pin photo diode sensor
generates a trigger signal for the engine controller to start activating the
paper feeding system.
7. LSU mirror.................................................... Diverts the laser beam vertically onto the drum. Note the diffused laser
beam finally pinpoints on the drum.
8. PD lens ........................................................ Condensing laser beam focus to the pin photo diode sensor.
9. Collimator lens ............................................. Aligns the laser beam to the cylindrical lens.
To Next Page
Loading...
