Structure - Toshiba e-STUDIO200L/230/280 SERIES Service Manual

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.
The aperture determines the shape of the laser beam at the laser emission position of the pri-
mary scanning and secondary scanning directions.
The laser diode radiates the laser beam responding to the laser emission control (ON/OFF) sig-
nal from the laser driving PC board. Laser beam which passed through the finite focus lens is
focused on the drum surface.
- CAUTION
The beam of the semiconductor laser is very weak (about 5 mW), however, the focused parallel
rays create 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:
The laser beam is not visible. Pay the closest attention when handling the laser unit components
or performing operations such as adjustment of the laser beam, and this kind of operation is very
dangerous and must be performed only by specially trained staff.
The warning label shown below is attached on the inner housing at the front side of the equip-
ment.
[CAUTION]
- Do not bring tools close to the path of the laser beam.
- Take off your watches, rings, bracelets, etc. before handling the unit.
June 2004 © TOSHIBA TEC
Fig.8-3
e-STUDIO200L/230/280 LASER OPTICAL UNIT
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