Laser Printer
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| Laser printers are similar to dry
photocopiers. A laser beam writes the image directly onto
a negatively charged selenium drum or belt. Where the
laser beam strikes the drum or belt the charge is
dissapated. These areas represent the white parts of the
image. The charge remains where the laser beam doesn't
strike the drum, these represent the black areas. Toner
(frequently black) is attracted to the charged areas so
that there is a pattern on the drum corresponding to the
black areas on the original. The drum rotates and comes
close to a sheet of paper. A positively charged wire
below the paper attracts the negatively charged toner
onto the paper. The paper then passes below a heater that
fuses the toner onto the paper to give a permanent image.
Colour laser printersð have three lasers and red, green and cyan toners to give the full spectrum of colours. Feel free to copy the graphic and text without restriction. Created by Mijami World. |
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