EP 4331857 A1 20240306 - OPTICAL ANTI-COUNTERFEITING ELEMENT, DESIGN METHOD THEREFOR, AND ANTI-COUNTERFEITING PRODUCT
Title (en)
OPTICAL ANTI-COUNTERFEITING ELEMENT, DESIGN METHOD THEREFOR, AND ANTI-COUNTERFEITING PRODUCT
Title (de)
FÄLSCHUNGSSICHERES OPTISCHES ELEMENT, ENTWURFSVERFAHREN DAFÜR UND FÄLSCHUNGSSICHERES PRODUKT
Title (fr)
ÉLÉMENT ANTI-CONTREFAÇON OPTIQUE, SON PROCÉDÉ DE CONCEPTION ET PRODUIT ANTI-CONTREFAÇON
Publication
Application
Priority
- CN 202110449712 A 20210425
- CN 2022073790 W 20220125
Abstract (en)
The present invention provides an optical anti-counterfeiting element and a design method therefor, and an anti-counterfeiting product. The optical anti-counterfeiting element has a roughly smooth diffuse reflective curved surface. Incident light is reflected by the diffuse reflective curved surface and then may form a roughly uniform brightness distribution in a range no less than a preset observation angle set Ωv. the diffuse reflective curved surface comprises modified curved surface regions and unmodified curved surface regions, the modified curved surface regions and the unmodified curved surface regions have different reflective properties, and the modified curved surface regions correspond to the pattern regions of animation frames. When the diffuse reflective curved surface is irradiated by the incident light, the modified curved surface regions collectively appear as a pattern of a dynamic feature, and the unmodified curved surface regions collectively appear as a background of the dynamic features. The fabrication process therefor is simple, and dynamic features such as color and/or bright and dark contrast may be flexibly achieved.
IPC 8 full level
B42D 25/30 (2014.01)
CPC (source: CN EP)
B42D 25/30 (2014.10 - CN); B42D 25/324 (2014.10 - EP); B42D 25/373 (2014.10 - EP); B42D 25/425 (2014.10 - EP)
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
Designated validation state (EPC)
KH MA MD TN
DOCDB simple family (publication)
EP 4331857 A1 20240306; CN 115230363 A 20221025; CN 115230363 B 20240329; WO 2022227741 A1 20221103
DOCDB simple family (application)
EP 22794222 A 20220125; CN 202110449712 A 20210425; CN 2022073790 W 20220125