8 Introduction
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MICROPLEX
Operator’s Manual SOLID 50 A3 - 3
Edition 2.1
Fundamentals of Digital Printing
Digital information (like a form with text, a company logo and
vector graphics) is transfered from the EDP - system to the
laserprinter’s input buffer in a coded manner called an
“emulation“ or “page description language“. The controller
decodes information and defines letters, numbers, graphics, etc.
into bit patterns and posts them into the controller’s frame store.
This way, a copy of the future print which is generated by dots
is produced.
The electronically controlled laserbeam now plots this dot
pattern in rows onto a rotating, light-sensitive negatively
charged drum. At those drum spots impacted by the light the
electronic charge is extinguished. The negatively charged toner
will stick to these spots. Because similar charges repulse each
other the remaining drum surface stays blank. The paper is
guided past the drum, while the electrostatically charged toner
particles are attracted by the paper. This process is supported
by a positively charged field that is below the paper (transfer
charger). When transported further, the toner particles, which
are affected by heat and pressure, are combined resistantly with
the paper inside the fusing unit. The drum is discharged and
cleaned.
