Confidential
Ref. 2-28
2. Exposure
Four laser beams radiated from a laser diode inside the laser unit are 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 an Electrostatic latent image is formed.
Fig. Ref2-26
Laser unit
Exposure drum (K)
Exposure drum (Y)
Exposure drum (M)
Exposure drum (C)
* View from top
* View from the right side
Polygon mirror
CO lens
CO lens
Laser diode Laser diode
CO lens
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