Where the beam hits the drum, it creates a negative (-) charge that's an exact copy of your page.(Reason: it's easier to make the mirror move than it is the laser). The high-intensity laser beam doesn't hit the drum directly it's actually reflected off a moving mirror. At this point, the charge is positive (+) and even across the drum surface.Ī small computer inside the printer reads the page from your own computer and guides the laser as it transfers the image to the drum. A high-voltage wire (called a corona wire) charges a cylindrical drum.
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