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The Print engine
It's tie print engine that forms the actual charactersand graphics.The
enginedirectsitslaser,apinpointstreamoflightpulses,throughmirrorsand
lensesonto the surfaceof a positively-charged rotatingdrum.
r"'""'
Lens
Laser beam
Scanning mirror
uctor laser diode
Photosensitive drum
Asthelaserscans,it"draws"thepage-mapstoredin yourprinter'smemory.
Wherevera lightpulsestrikes,that tiny part of the drumdropsto a neutral
electricalcharge. That spot then attracts fine toner powder as the drum
rotatespast the powdercompartment.
Asthe drumrotatesfurtherit meetsthepaper.Thepaperitselfis negatively
chargedbypassingby a finecoronawire.Sinceoppositechargesattract,the
negativepaperclingsto the positivedrum.Then heat and pressurefrom a
rollermeltorjkre thedotsof tonerontothepaper,preciselyreproducingthe
image.
Finallythepaperslidesintotheoutputbin.Thepaperusuallycomesoutface
down so it stacksin the correctsequence.
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