Compact disc. Photograph of an audio compact disc. The CD stores music as a series of fine depressions,representing a digitised musical signal capable of being read by a laser. To reflect the laser light,the music layer is coated with a fine film of metal,normally aluminium,which follows the depressions exactly. The reflective surface is covered by a thick layer of transparent plastic which prevents dust scratches from affecting the sound quality. A standard audio CD can store about 80 minutes of music | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Lovegrove, Damien |
Taille de l’image : | 4488 px × 4488 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |