OPTICAL RECORDING MEDIUM HAVING RECORDED REAL COMMODITY DISPLAY IMAGE PROJECTION DATA THEREON, ITS MANUFACTURE AND METHOD FOR JUDGING AUTHENTICITY OF COMMODITY

摘要

PROBLEM TO BE SOLVED: To easily judge whether it is an unfair copied product or a real product and to make forgery extremely difficult. ;SOLUTION: This optical recording medium is constituted so that a hologram pattern is recorded beforehand as a CGH(computer generated hologram) 5 so that its transmissive diffraction beam or a reflective diffraction beam projects a prescribed image 7 showing that it is the real product when a single color beam 9 is emitted, and at an inspection time, the CGH 5 is irradiated with the single color beam, and whether or not the prescribed image 7 is reproduced is confirmed visually.;COPYRIGHT: (C)2000,JPO