Figure 12-11.—A daisy wheel.
LASER PRINTERS
Laser printers are a type of electrostatic printer that
produce a very high resolution print on plain paper.
Laser printers are classified as page printers; that is, they
print a whole page at a time. Laser printers can print
from four to eight pages per minute with a resolution of
300 to 600 dots per inch (dpi).
The development of a laser engine by Canon
U. S.A., Inc., is largely responsible for the laser printer’s
Figure 12-12.—A daisy wheel print mechanism.
popularity and affordability. The Canon engine
combines the print drum, toner, and other parts into a
single, easily replaced disposable cartridge.
Laser Print Cycle
The laser printer’s disposable cartridge is the heart
of the printer’s system. The cartridge contains the print
drum, primary corona wire, a supply of toner, cleaning
blade, erase lamp, and rollers. The laser printer’s image
formation process is illustrated in figure 12-13.
Figure 12-13.—A laser printer’s image formation process.
12-11
