How does a scanner copy a page into a computer?
Light Bar's Big Journey
How does a scanner copy a page into a computer?
You press a button, and suddenly the drawing on your desk appears on the screen. No camera, no magic — just a flat glass panel and some whirring sounds. How does a scanner pull a picture off a page and shove it into a computer?
Inside the scanner, under the glass, lives a long skinny light bar — bright as a dentist's lamp — mounted on a little moving cart. When you hit scan, that bar slides slowly from top to bottom, dragging its beam of light across every millimeter of your page.
