Laser reading digital pits on a CD/DVD

Numéro d’image : 11599750
Laser reading digital pits on a CD/DVD
Computer artwork showing light emitted by a laser diode being focussed onto a compact disc by a small lens. The metal disc underneath is etched by a laser beam to produce the microscopic pits which carry the digital code representing sounds. The code is read by a laser reflecting the pits of the etched surface back through the lens onto a sensor in a CD player which converts the signal back into music. To reflect the laser light,the music layer is coated with a fine film of metal which follows the depressions exactly. Each depression is either long or short,each representing a bit. Eight bits form a byte. CDs can hold millions of bytes of data. DVDs can hold billions of bytes of data. The data track is about 0.5 micrometres wide,and is several kilometres long
Licence : Droits gérés
Crédit: Science Photo Library / Parker, David
Taille de l’image : 4100 px × 4800 px
Model Release : Non requis
Property Release : Non requis
Restrictions : -

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