An apparatus for checking a film for defects has a pair of polarizers placed on the opposite sides of the film to be checked, an illumination light source placed outside the pair of polarizers, a light receiving device placed outside the pair of polarizers and opposite from the illumination light source,...http://www.google.fr/patents/US20010021016?utm_source=gb-gplus-shareBrevet US20010021016 - Apparatus, system and method for checking film for defect
Apparatus, system and method for checking film for defect
Numéro de demande: 09/800,473 Numéro de publication: US 2001/0021016 A1 Date de dépôt: 8 mars 2001 Brevet délivré: US6650410 ( Date de délivrance 18 nov. 2003)
