EP 1096451 A1 20010502 - Detection method of semi-soft security features
Title (en)
Detection method of semi-soft security features
Title (de)
Verfahren zur halbweichen Sicherheitseinrichtungsdetektion
Title (fr)
Méthode de détection de dispositifs de sécurité mi-doux
Publication
Application
Priority
EP 99203618 A 19991101
Abstract (en)
A method for detecting the presence of a semi-soft magnetic or soft magnetic security feature in a substrate of a security article wherein this soft magnetic security feature has a magnetic saturation field ranging from 100 A/m to 1000 A/m, comprises following steps : (a) emitting an electromagnetic drive signal of one or more particular frequencies to an article so that any present semi-soft magnetic security features in the article go into saturation for both positive and negative magnetic fields; (b) detecting an electromagnetic detection signal (20) emanating from the article; (c) measuring the height (C) of the peaks of the detection signal ; (d) measuring the time or relative phase delays (B) between a reference point of the drive signal and a point at which the peaks occur; (e) comparing the measured heights and measured time or relative phase delays with values which are typical for semi-soft magnetic features. <IMAGE>
IPC 1-7
IPC 8 full level
G08B 13/24 (2006.01)
CPC (source: EP)
G08B 13/2408 (2013.01); G08B 13/2442 (2013.01); G08B 13/2471 (2013.01)
Citation (search report)
- [XY] EP 0295085 A1 19881214 - SCIENT GENERICS LTD [GB]
- [Y] EP 0295028 A1 19881214 - SCIENT GENERICS LTD [GB]
- [XA] US 5204526 A 19930420 - YAMASHITA MITSUO [US], et al
- [X] EP 0366335 A2 19900502 - EMI PLC THORN [GB]
Designated contracting state (EPC)
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
DOCDB simple family (application)
EP 99203618 A 19991101