Optical Path - Gestetner A193 Service Manual

3.2 OPTICAL PATH

[H]
[C]
[E]
[B]
[H]
The output path from the laser diode to the drum is shown above.
The LD unit [A] outputs pulsing the laser beam to the rotating polygon mirror
[B] through the cylindrical lens [C].
Each surface of the polygon mirror reflects a full main scan line. The laser
beam goes to the F-theta mirror [D], 1st mirror [E], and BTL (Barrel Toroidal
Lens) [F]. The 2nd mirror [G] reflects the laser beam onto the surface of the
drum through the toner shield glass.
The laser synchronizing detector [H] is used to determines the main scan
starting position.
SM
[B] [E]
[F]
[F]
2-19
LASER EXPOSURE
[D]
[G]
[A]
[D]
[G]
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