An optically variable security device comprising a thin film reflection filter structure (23) which exhibits a first optically variable effect; and a relief structure (20) on or in the thin film reflection filter structure which exhibits a second optically variable effect.
申请公布号
CA2402134(A1)
申请公布日期
2002.01.03
申请号
CA20012402134
申请日期
2001.06.27
申请人
DE LA RUE INTERNATIONAL LIMITED
发明人
DRINKWATER, KENNETH JOHN;KAY, RALPH;HOLMES, BRIAN WILLIAM
