e-STUDIO520/600/720/850 LASER OPTICAL UNIT March 2005 © TOSHIBA TEC
8 - 4
8.2 Structure
8.2.1 Laser optical unit
This unit consists of the laser diode, finite focus lens, aperture, half mirror (*1), galvanic mirror (GLV)
(*1) and cylinder lens.
* 1: Used for the e-STUDIO850 only
• Laser diode
This laser diode features low drooping, small laser variation and a low threshold current. The aper-
ture determines the shape of the laser beam at the laser emission position. The laser diode radiates
the laser beams responding to the laser emission control (ON/OFF) signals from the laser drive
board. Laser beams which have passed through the finite focus lens are focused on the drum sur-
face.
• 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 unit is completely sealed with a protective cover. As long as only the operations of speci-
fied 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 left side of the front-inner cover.
Fig.8-4
Cautions:
• Avoid expose to laser beam during service. This equipment uses a laser diode. Be sure not to
expose your eyes to the laser beam. Do not insert reflecting parts or tools such as a screw-
driver on the laser beam path. Remove all reflecting metals such as watches, rings, etc.
before starting service.
• When servicing the equipment with the power turned ON, be sure not to touch live sections
and rotating/operating sections. Avoid exposing your eyes to laser beam.
• During servicing, be sure to check the rating plate and cautionary labels such as "Unplug the
power cable during service", "CAUTION. HOT", "CAUTION. HIGH VOLTAGE", "CAUTION.
LASER BEAM", etc. to see if there is any dirt on their surface and if they are properly stuck to
the equipment.
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