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COPY PROCESS
June 30, 1998
1.5 COPY PROCESS
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A229V508.WMF
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A229V510.WMF
1. EXPOSURE
Two xenon lamps expose the original. Light reflected from the original passes to
the CCD, where it is converted into an analog data signal. This data is converted to
a digital signal, processed, and stored in the memory. At the time of printing ,the
data is retrieved and sent to the laser diode. For multi-copy runs, the original is
scanned once only and stored to the hard disk.
2. DRUM CHARGE
An OPC (organic photoconductor) drum is used in this machine. In the dark, the
charge corona unit gives a negative charge to the drum. The grid plate ensures
that corona charge is applied uniformly. The charge remains on the surface of the
drum because the OPC layer has a high electrical resistance in the dark.
3. LASER EXPOSURE
The processed data from the scanned original is retrieved from the hard disk and
transferred to the drum by two laser beams, which form an electrostatic 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 SBICU
board.
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