Laser Printer
Laser printers are based on the principle of
static electricity or static charge.
How Laser
Printer works?
It is quite
complex to bring the working method of laser printer in detail but a basic idea
behind it, is written below.
A laser
printer consists of drum (a
photoreceptor assembly), corona wire,
discharge lamp, toner hooper, fuser etc. at first drum is loaded with
positive charge by means of corona
discharge and as drum revolves a laser beam is brought on the surface of
drum which creates negatively charged invisible electrostatic image of letters
or pictures to be printed.
System will
not be affected if charge is reversed i.e. drum is initially loaded with
negative charge.
After this
printer spreads positively charged toner over the drum which adhere to the
negatively charged portions of the drum, after this pattern is fixed a negatively
charged paper (it is also charged by corona discharge) rolls over the drum
which attract the positively charged toner which ditto the image on the paper.
To avoid the sticking of paper with drum it is discharged by detac corona wire. At last paper passes
through the heated fuser which melts the toner and fused it with the paper by
means of pressure. Speed of paper through fuser is maintained such that it can
pass up without catching fire. Mean while a bright light emitting from
discharge lamp clean the electrical image formed on the drum and drum get ready
to print next page.
For shopping of Toner visit our online cartridge shop
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