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COPY PROCESS
3. LASER EXPOSURE
The processed data scanned from the original is retrieved from the memory
and transferred to the drum by a laser beam, which forms an electrical latent
image on the drum surface. The amount of charge remaining as a latent image
on the drum depends on the laser beam intensity, which is controlled by the
BICU board.
4. DEVELOPMENT
The magnetic developer brush on the development rollers comes in contact
with the latent image on the drum surface. Toner particles are electrostatically
attached to the areas of the drum surface where the laser reduced the negative
charge on the drum.
5. ID SENSOR
The laser forms a sensor pattern on the drum surface. The ID sensor measures
the reflectivity of the pattern. The output signal is one of the factors used for
toner supply control. Also, the ID sensor measures the reflectivity of the drum
surface. The output signal is used for charge roller voltage control.
6. IMAGE TRANSFER
Paper is fed to the area between the drum surface and the transfer roller at the
proper time for aligning the copy paper and the developed image on the drum
surface. Then, the transfer roller applies a high positive charge to the reverse
side of the paper. This positive charge pulls the toner particles from the drum
surface onto the paper. At the same time, the paper is electrostatically attracted
to the transfer roller.
7. PAPER SEPARATION
Paper separates from the drum as a result of the electrostatic attraction
between the paper and the transfer roller. The discharge plate helps separate
the paper from the drum.
8. CLEANING
The cleaning blade removes any toner remaining on the drum surface after the
image transfers to the paper.
9. QUENCHING
The light from the quenching lamp electrically neutralizes the charge on the
drum surface.
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20 September 1999
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