OPTICAL STRUCTURE FOR GENUINENESS CERTIFICATION, RECORDING MEDIUM FOR GENUINENESS CERTIFICATION, AND ITS CONFIRMATION METHOD

摘要

PPROBLEM TO BE SOLVED: To solve the point that information for genuineness confirmation is deficient in secrecy since the full aspect of a hologram is made known when the hologram is detected or observed by a conventional technology. PSOLUTION: Images aSB1/SBand aSB2/SBwhich are reproduced with coherent light with a wavelength λa are compared with images bSB1/SBand bSB2/SBreproduced with coherent light with a wavelength λb (λaλb) to judge, for example, whether the images bSB1/SBand aSB1/SBare different, thereby confirming genuineness. PCOPYRIGHT: (C)2004,JPO