An optical pickup apparatus for an information reproducing apparatus is adapted to reproduce one of at least first and second type optical record media which is loaded on the information reproducing apparatus. The first and second type optical record media have distances from surfaces to information...http://www.google.fr/patents/US5757742?utm_source=gb-gplus-shareBrevet US5757742 - Optical pickup apparatus for optical record media and identification apparatus for identifying the type of optical record media
Optical pickup apparatus for optical record media and identification ...
