OPTICAL VARIABLE ELEMENT HAVING A VARIABLE DISTANCE-LAYER THICKNESS
The security element (6) has a thin-film layer sequence (62,63,64,66,69) incorporating a diffractive structure (67) and at least one spacer layer (65) for providing a color shift via interference. The spacer layer is formed as 2 partial layers (65a,65b) and has a different layer thickness in a first...
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Main Authors | , |
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Format | Patent |
Language | English |
Published |
03.03.2004
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Edition | 7 |
Subjects | |
Online Access | Get full text |
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