EP 0746781 A1 19961211 - MULTIPLE IMAGE DIFFRACTIVE DEVICE
Title (en)
MULTIPLE IMAGE DIFFRACTIVE DEVICE
Title (de)
DIFFRAKTIVE MEHRFACHBILDVORRICHTUNG
Title (fr)
DISPOSITIF A DIFFRACTION A IMAGES MULTIPLES
Publication
Application
Priority
- AU 9400381 W 19940708
- AU PL988593 A 19930709
Abstract (en)
[origin: WO9502200A1] A diffractive device has a surface relief structure which, when illuminated by a light source, generates at least two diffraction images which can be observed from particular ranges of viewing angles around the device. At least one surface region (3) has two or more superimposed diffractive surface structures (1, 2), each of which gives rise to a separate diffraction image or component of a diffraction image. The diffractive device is particularly suitable as anti-forgery security device on banknotes, credit cards, cheques, share certificates and other similar documents.
IPC 1-7
IPC 8 full level
B42D 15/10 (2006.01); B42D 25/328 (2014.01); G02B 5/18 (2006.01)
CPC (source: EP)
B42D 25/328 (2014.10); G02B 5/1842 (2013.01)
Designated contracting state (EPC)
CH DE FR GB LI
DOCDB simple family (publication)
WO 9502200 A1 19950119; EP 0746781 A1 19961211; EP 0746781 A4 19960528
DOCDB simple family (application)
AU 9400381 W 19940708; EP 94920339 A 19940708