L'oeuvre de l'ordinateur montrant la lumière émise par une diode laser d'être concentré sur un disque compact par un petit objectif. Le disque métallique en dessous est gravée par a l

• Contributeur: Science Photo Library
• ID de l’image: 2ACJANX
• Taille du fichier: 53,4 MB (2,4 MB Téléchargement compressé)
• Autorisations: Modèle - non | Propriété - non
• Dimensions: 5332 x 3500 px | 45,1 x 29,6 cm | 17,8 x 11,7 inches | 300dpi
• Date de la prise de vue: 10 mars 2011
• Photographe: DAVID PARKER/SCIENCE PHOTO LIBRARY

Informations supplémentaires

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.

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