PRINTING 30 November, 1999
2-6
2.2.4 LASER EXPOSURE
Overview
•
The focusing lens [A] is a double toroidal lens that has a barrel toroidal
surface on both sides.
•
The shield glass [B] prevents toner and dust from entering the laser optics
area.
•
The speed of the hexagonal mirror motor [C] is 5793.88 rpm
(16 x 15.4 dots/mm).
•
The strength of the beam emitted from the LD unit [D] is 0.2 mW with a
wavelength of 780 nm. The photo transistor [E] inside the LD unit
synchronizes the laser main scan.
•
The mirror [F] reflects the laser beam onto the drum.
The charge on the exposed areas of the drum drops to about -200V while non-
exposed areas remain at around -750V.
As a mechanical safety feature, a shutter slides to block the laser beam path
whenever the upper unit is opened.
Cross Reference
Group 3 Facsimile Manual: section 4-3-3
H545D505.WMF
[A]
[B]
[C]
[D]
[F]
[E]
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