| 摘要 |
PURPOSE:To easily form a system for preventing copying by previously sticking polarizing films which are random in polarization directions to an original platen and previously sticking a polarizing film to a document, etc., to be prevented of copying. CONSTITUTION:The 2nd polarizing body 4 is adhered by an adhesive agent 5 to the original platen glass 6 of an electrophotographic copying machine. The 1st polarizing body 3 is adhered by an adhesive agent 2 to the original in order to prevent the copying thereof. An ordinary copying is obtd. when such original is copied and if the polarization directions of the 1st and 2nd polarizing bodies coincide with each other with respect to light 8 from a light source 7. The light is shielded and the non-image part is imaged like an image part if the polarization directions deviate from each other. The copying is thus prevented by allowing the 1st and 2nd polarizing bodies 3, 4 to exist in proximity to an exposing system. |
