webmail IT Administrator - Michael Martedal Hansen CO2 neutral Hjemmeside

Printer Basics Notes


Tilbage

Five types

Impact

Dot Matrix
Slow, loud
Physically strike the paper


Inkjet

Quiet
Shoot ink onto paper in very tiny drolets
Vary in resolution (dpi) and pages per minute (ppm)


Dye-Sublimation

Also called thermal dye transfer
Ink is changed from solid to vapor
Extremely high quality
Continuous tone image; not single color dots arranged to form object


Thermal

Use heat to burn image ontp media


Laser

Electro-photographic imaging
High quality, high speed



Laser Printing Process

Clean -> Charge -> Write -> Develop -> Transfer -> Fuse


Clean

The drum assembly is cleaned for it´s next printing task.


The Discharge (or erase) lamp emits the light at the proper warelengths to cause the drum to have a neutral charge.


Charge

The drum must be charged.


As the drum spins, the carona wire applies a uniform, negative charge to it (between 600 and 1000 volts)


Write and Develop

A laser writes an image of what is to be printed on the drum.


The laser creates a less negative charge everywhere it hits the drum.
This attracts toner onto those areas and creates a developed image on the drum.


Transfer

The paper is positively charged by the transfer carona.


When it passes next to the drum, the negatively chared toner particles leap from the drum onto the paper.


Fuse

The toner particles are melted, or fused, onto the paper.



Printer Languages

Four Languages

• ASCII

American Standard Code Information Interchange
Standard codes for transferring data (some are for printers)


• PostScript

Offloads processing to the printer


• PLC

Hewlett Packard Printer Control Language
• Expanded ASCII


• Windows GDI

Processing handled by CPU; requires plenty of RAM on the printer


Tilbage