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Technician electronically checks compact discs

Technician electronically checks compact discs

T515/0209

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Credit

MAXIMILIAN STOCK LTD / SCIENCE PHOTO LIBRARY MAXIMILIAN STOCK LTD / SCIENCE PHOTO LIBRARY

Caption

Compact disc test. Technician checks a newly-produced compact disc (CD) as part of quality control. He is using electronic equip- ment which measures and evaluates the quality of the data on the disc. The data (such as music, text or images) is stored as a series of fine dep- ressions on the disc's plastic surface, encoding a digitised signal that can be read by a laser. To reflect the laser light, the coded layer is coated with a fine film of metal which follows the depressions exactly. This is then covered by ano- ther layer of transparent plastic which prevents dust and scratches from affecting the readout. Audio compact discs have high sound quality.

Release details

Model release available. Property release not required.

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