Method and apparatus for optically recording information on a moving information storage member and for reading the information immediately after it is written. An intensity modulated writing beam and a separate reading beam of light are simultaneously focused by a single objective lens. The reading...http://www.google.fr/patents/US4583210?utm_source=gb-gplus-shareBrevet US4583210 - Method and apparatus for storing and retrieving information
Method and apparatus for storing and retrieving information
