Optical Path - Ricoh A230 Service Manual

LASER EXPOSURE

2.3.2 OPTICAL PATH

[I] [G] [E]
[F]
[D]
[B]
[C]
A231D501.WMF
[H]
[A]
The output path from the laser diode to the drum is shown above.
The LD unit [A] outputs two laser beams to the polygon mirror [B] through the
cylindrical lens [C] and the shield glass [D].
Each surface of the polygon mirror reflects two full main scan lines. The laser
beams go to the F-theta mirror [E], mirror [F], and BTL (barrel toroidal lens) [G].
Then these laser beams go to the drum through the toner shield glass [H].
The laser synchronizing detector [I] determines the main scan starting position.
A230/A231/A232 SM
2-23