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November 2003 © TOSHIBA TEC 8 - 3 e-STUDIO3511/4511 LASER OPTICAL UNIT
8
8.2 Structure
(1) Laser emission Unit
This unit consists of the laser diode, finite focus lens, aperture and cylinder lens.
a. 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. Laser beams which passed through the finite focus lens are
focused on the drum surface.
b. CAUTION
The beam of the semiconductor laser is very weak (about 10 mW), but focused parallel rays
creates great energy which is hazardous.
Some materials of the components of the laser optical unit are metal. Since the unit is in a sealed
container, there is no danger of laser leakage during normal operation.
Note: Laser beam is not visible. Pay the closest attention when handling the laser unit compo-
nents or performing operations such as adjustment of the laser beam, and this kind of
operations are very dangerous and must be performed only by specially trained staff.
The warning label shown below is attached on the left side of the upper inner cover.
Fig. 8-201
[CAUTION]
• Do not approach tools near the path of the laser beam.
• Take off your watches, rings, bracelets, etc. before handling the unit.