Title:
光学セキュリティ要素
Document Type and Number:
Japanese Patent JP7263654
Kind Code:
B2
Abstract:
The invention relates to a thin optical security element comprising a reflective or refractive light-redirecting surface having a relief pattern operable to redirect incident light from a light source and form a projected image on a projection surface, the optical parameters of this optical security element fulfilling a specific projection criterion such that the projected image comprises a caustic pattern reproducing a reference pattern that is easily visually recognizable by a person. The invention also relates to a method for designing a relief pattern of an optical security element.
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Inventors:
Calgari, Andrea
Degot, Pierre
Dinove, Todor
Garnier, Christophe
mayer, alan
Schwarzburg, Yury
Testaz, Romaine
Pauly, Mark
Degot, Pierre
Dinove, Todor
Garnier, Christophe
mayer, alan
Schwarzburg, Yury
Testaz, Romaine
Pauly, Mark
Application Number:
JP2020508590A
Publication Date:
April 25, 2023
Filing Date:
September 28, 2018
Export Citation:
Assignee:
SICPA HOLDING SA
International Classes:
G02B5/00; B42D25/324
Domestic Patent References:
| JP2006023567A |
Foreign References:
| WO1999037488A1 |
Attorney, Agent or Firm:
Ikeda Adult
Yoshinori Shimizu
Junichiro Sakamaki
Hidehiko Suzuki
Yoshinori Shimizu
Junichiro Sakamaki
Hidehiko Suzuki