Multilayer reflector, authentication card, bar code label, authentication system, and authentication region forming system
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Oct 30, 2012
Grant Date -
May 20, 2010
app pub date -
Jun 21, 2006
filing date -
Jun 23, 2005
priority date (Note) -
In Force
status (Latency Note)
Importance
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
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Advertisement
Advertisement
Advertisement
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully