Toshiba e-STUDIO 206, Service Manual

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e-STUDIO166/206 © February 2007 TOSHIBA TEC CORPORATION All rights reserved
LASER OPTICAL UNIT
8 - 2
8.2 Structure
1) Laser emission Unit
This unit consists of the laser diode, finite focus lens, aperture and cylinder lens.
-
Laser diode
This laser diode features low droop, small laser variation and low threshold current.
Aperture determines the shape of the laser beam at laser emission position of the primary scan-
ning and secondary scanning.
Laser diode radiates the laser beams responding to the laser emission control (ON/OFF) signals
from the laser driving PC board (LDR). Laser beams which passed through the finite focus lens
are focused on the drum surface.
- Laser precautions
A laser diode is used for this equipment and radiates an invisible laser beam.
Since it is not visible, be extremely careful when handling the laser optical unit components, per-
forming operations or adjusting the laser beam. Also never perform the procedure with other than
the specified manuals because you could be exposed to the laser radiation.
The laser optical unit is completely sealed with a protective cover. As long as only the operations
of specified manuals are performed, the laser beam is not leaked and you are in no danger of
being exposed to laser radiation.
The following cautionary label for the laser is attached to the front right cover (inside of the front
cover).
Fig. 8-3
Laser optical unit (1 beam)
Laser emission unit Laser diode Wavelength: Approx.785 nm
Output power rating: 5 mW
Fine focus lens
Aperture (Slit)
Cylinder lens
Laser driving PC board (LDR)
Polygonal motor unit Polygonal motor (M4)
Polygonal mirror 6 planes
f # lens-1
f
#
lens-2
H-Sync returning mirror
Slit glass
H-sync signal detection PC board
(SNS)