EP 0858400 B1 20021211 - Document with a moiré-effect-generating screen structure
Title (en)
Document with a moiré-effect-generating screen structure
Title (de)
Dokument mit Moirémuster-erzeugender Rasterstruktur
Title (fr)
Document a structure de trame produisant un effet Moiré
Publication
Application
Priority
- DE 19635761 A 19960903
- EP 9704745 W 19970901
Abstract (en)
[origin: US6357800B1] A data carrier with at least one halftone images 10 represented by structural elements 12, whereby a predetermined symmetrical widening of structural elements 12 represents a corresponding gray level of halftone image 10. Image 10 has predetermined areas 14, 16 and 22 each having a predetermined number or screen frequency of structural elements 12, the screen frequency of structural elements 12 per unit area of area 14, 16 and 22 being different between at least two areas 14, 16 and 22 and/or structural elements 12 being offset from each other in at least two areas 14, 16 and 22. A data carrier with such a halftone image 10 acquires a moiré pattern in at least predetermined areas of halftone image 10 when copied, so that a copy of the data carrier is recognizable immediately and with the naked eye (FIG. 1).
IPC 1-7
IPC 8 full level
B41M 3/14 (2006.01); B42D 15/00 (2006.01); B42D 25/342 (2014.01); G07D 7/005 (2016.01)
CPC (source: EP US)
B42D 25/342 (2014.10 - EP US); G07D 7/0057 (2017.04 - EP US)
Designated contracting state (EPC)
AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
US 6357800 B1 20020319; AT E229441 T1 20021215; AU 4208597 A 19980326; CA 2236326 A1 19980312; DE 19635761 A1 19980305; DE 59708947 D1 20030123; EP 0858400 A1 19980819; EP 0858400 B1 20021211; RU 2191118 C2 20021020; WO 9809825 A1 19980312
DOCDB simple family (application)
US 6801998 A 19981005; AT 97940149 T 19970901; AU 4208597 A 19970901; CA 2236326 A 19970901; DE 19635761 A 19960903; DE 59708947 T 19970901; EP 9704745 W 19970901; EP 97940149 A 19970901; RU 98110275 A 19970901