April 7th, 2003, 08:12 AM
All About Lasers
Ok, this tutorial will be a short one on how the laser printer works. Now
i am a bit rusty because of the fact that I haven't studied these in a
long while, but wanted to write a tutorial and this came to mind. I will
basically just go over the order of events (ie what happens from start to
finish during a regular print job, as that is important in understanding
how the laser printer works.)
Ok first off, the laser printer has to "Charge" as in, get its stuff
warmed up. It uses the high-voltage power supply (HVPS) to conduct
electricity to its primary corona wire. Which then passes the voltage to
"Drum" I wont go over the specific parts such as what the drum actually
does, etc because if you are reading this, you should already have an
understanding of the components of the laser printer. Typically, the
voltage used in the first step is around -5000vDC (volts of direct
The second step is referred to as "Writing" the photosensitive drum with
its newly charged voltage, as per the first step, now has a very high
negative charge. The laser of the printer begins to move back and forth,
so to speak, along the drum, creating the image that will be on the
output. ie paper. Because this drum is photosensitive, the laser uses
charge each time it touches something. (Toner, drum, whatever) By the
end of the printers writing, the image is now around -100vDC. The drum
however, retains most of its charge, if not all.
The third step is known as developing. The toner cartridge is now opened
up. The toner becomes attracted and is able to be used. By the end of this
stage, the drum contains a toner covered image. and the drum retains most
of its charge, yet again.
The fourth step, known as transferring, is where the paper begins to come
through the printer, and past the drum. The transfer corona wire is what
applies the positive charge to the paper as it moves through. This charge
pulls negative charged toner from the drum out onto the paper.
The fifth step, known as Fusing, is the only thing holding the toner to
the paper as the electric charges. The toner melts its resin, when heated,
and the paper leaves the printer through fusing rollers, which are
previously heated by the fusing lamp. The heat on the rollers then melts
or fuses, to the paper.
Cleaning is the final step, this is when the printout completes, of
course. A rubber cleaning blade goes across the drum to remove the
extra toner that wasn't used from the drum. The toner is then moved over
to a small place for it to remain for later use. Next, erasure lamps
move across exposing the drum to the light. Again remember that the
drum is photosenstive, and loses remaining charge when light hits it
The printer is now returned to its previous pre-print state, and is ready
to go for more.
I recommend a good HP-Laserjet printer, or something of the like. I do not
own one personally, but have used them extensiveley in class and at other
places. Hope you liked the short tutorial, you can find some of the
keywords used at places like google.com, tech-target definitions, etc..
Any questions or comments email email@example.com
like i said, its been a while so this off of my head may be inaccurate,
especially the charges, but maybe not..
April 7th, 2003, 03:20 PM
hahahahha ****in printers w000t 31337
April 8th, 2003, 12:40 AM
hahahahah yerp, i was bored, so i through that together for something to do
April 8th, 2003, 02:10 AM
heh just unexpected. gj though.
you could at leasy explained the old paper cut vulrability or paper burn :P