Optical Path - Gestetner B070 Service Manual

6.10.7 OPTICAL PATH

[C]
[A]
[J]
The output path from the laser diode to the drum is shown above.
The LD unit [A] outputs eight laser beams to the polygonal mirror [B] (six mirror
surfaces) through the cylindrical lens [C] and the 1st mirror [D].
Each surface of the polygon mirror reflects eight full main scan lines. The laser
beams go to the F-theta lens 1 [E], F-theta lens 2 [F], BTL (barrel toroidal lens) [G],
and mirror [H]. Then these laser beams go to the drum through the toner shield
glass [I].
The laser synchronizing detector [J] determines the main scan starting position.
This sensor sends a synchronization signal when the laser synchronization
detector mirror [K] reflects the laser beam to the detector as the laser beam starts
its sweep across the drum.
The laser synchronization detector detects only the beams emitted from Channels
1 and 0, the uppermost beams of each parallel array.
SM
CÓPIA NÃO CONTROLADA
[D]
[B]
[K]
6-55
CÓPIA NÃO CONTROLADA
LASER EXPOSURE
[E]
[F]
[G]
B070D101.WMF
[H]
[I]
B070/B071