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It detects the reflected light from the illumination system and generates an analog signal that is sent to the decoder. The decoder interprets that signal, validates the barcode using the check digit, and coverts it into text.
http://www.independent.co.uk/property/house-and-home/laser-a-timeline-1973907.html -
Laser beams scan back and forth across a drum inside the printer, building up a pattern of static electricity. The static electricity attracts onto the page a kind of powdered ink called toner.
http://www.independent.co.uk/property/house-and-home/laser-a-timeline-1973907.html -
Below the CD optical disc is a laser mounted to a moving sled. The sled can move back and forth along the CD as it spins. In close proximity to the laser beam is a photo receptor that converts the reflected laser light into an electric current. http://www.independent.co.uk/property/house-and-home/laser-a-timeline-1973907.html
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Inside your CD player, there is a miniature laser beam (semiconductor diode laser) and a small photoelectric cell (an electronic light detector) The laser flashes up onto the shiny under side of the CD, bouncing off the patterns on the disc. http://www.independent.co.uk/property/house-and-home/laser-a-timeline-1973907.html
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