General Information 1-7
4022-XXX
In the exposure step, thin laser beam scans the drum surface which was negatively
charged in the charging step of the previous process. The laser beam emitted by the laser
diode of the printhead scans from end to end of the drum through the rotating polyhedron
mirror (Polygon Mirror: 6 or 12 sides) and lens.
Radiation from the laser beam is adjusted according to the video signal from the
controller.
The laser beam irradiated to the drum excites the electron going toward the conductor
and generates a pair of electronic holes in the light transmission layer. As the electronic
holes move to the surface of the light transmission layer when the electron moves toward
the body in the drum along the electric field, the negative charge at that part decreases
and invisible electrostatic latent image is generated.
Toner is absorbed to the electrostatic latent image and developed.
Toner absorbed to the drum is attracted by the positive electric charge supplied by
Transfer Roller and transcribed on the paper and the drum goes to the separating and
cleaning process.
In the cleaning step, residual toner is removed from the drum surface as the surface is
prepared for the next cycle.
The toner is scraped off the drum surface by the cleaning blade.
Note: The toner rubbed off in the cleaning step is collected in the recovery toner
compartment separated from the unused toner. The transcription ratio is 90% or more,
but it varies depending on the image cover range and environment conditions such as the
temperature and humidity. The used toner cannot be reused.
Note: At the starting time for each print process, the entire drum surface is scanned with
laser beams, and the charge remaining on the drum surface from the preceding print step
is removed completely.
Note: At the starting and ending times of the continuous print process, the negative high-
voltage is applied to the Transfer Roller. If residual toner is on the Transfer Roller surface
in the preceding print step, it is returned onto the drum surface to clean the Transfer
Roller surface.
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