Multilayer reflector, authentication card, bar code label, authentication system, and authentication region forming system
US8297522B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Jun 21, 2006 |
| Grant date | Oct 30, 2012 |
| Priority date | — |
| Expiry date | Apr 9, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09F2003/0279
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
Provided is a multilayer reflector about which a complicated step is not required when the molecular alignment of a retardation film is partially relaxed to form a latent image of authentication information, and about which the latent image is not made visible by the generation of unevenness in the surface. A multilayer reflector 1 has a retardation film 10 in which the phase difference Δnd1 to an observation wavelength λ is set to be m×λ/4−λ/16≦Δnd1≦m×λ/4+λ/16 wherein m is a positive odd number, and a metallic reflector 11 laminated on the rear face side of this retardation film 10, wherein an authentication region 10a where predetermined authentication information is beforehand formed in the retardation film 10 is formed to give a phase difference Δnd2 set to be n×λ/4−λ/8 ≦Δnd2≦n×λ/4+λ/8 wherein n is 0 or a positive even number provided that n<m, and further a light diffusing layer 12 is formed on the front face side of the retardation film 10.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.