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(2) Exposure
The laser beam radiated from a laser diode inside the laser unit is concentrated into a
constant width by a slit in the CO lens cell and then reflected by a polygon mirror rotating at
high speed. The evenly charged exposure drum is irradiated with reflected light and exposed.
Surface potential is lowered by such exposure and a printed image is formed.
CO lens
Laser diode
Polygon mirror
Laser unit
Exposure drum
Fig. 2-16
2-18
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