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A corona wire is used for the primary charge, but since the drum is positively charged, only less than 1/10 of the
usual amount of ozone is formed relative to the charged drum. So the amount of ozone emitted by the printer will
not harm the human body and complies with safe use standards.
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Exposing
After the toner cartridge is charged, it is exposed to the light projected by the laser unit.
<LSU>
1. The laser beam is radiated from 1 laser diode in the laser unit, and forms a fixed width through a slit on the CO
lens. It is then reflected by a polygonal mirror that rotates at high speed.
2. The laser beam is reflected by the polygon mirror. When the polygon mirror rotates, it is reflected by the θ lens
and passes from the right side of the mirror to the left end. At this time, the curvature of the laser beam blurred in
the vertical direction of the polygon mirror is corrected by a CYL lens.
3. The laser beam reflected by the mirror directly passes through the photosensitive drum below it, and then the
photosensitive drum is exposed to the laser beam.
The area exposed by the laser is the image to be printed. The surface voltage of the exposed area is reduced,
resulting in an electro-statically printed image.
Confidential
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