Invention Grant
- Patent Title: Optically variable element
-
Application No.: US14361098Application Date: 2012-11-28
-
Publication No.: US09798055B2Publication Date: 2017-10-24
- Inventor: Harald Walter , Wayne Robert Tompkin , Sebastian Mader
- Applicant: OVD Kinegram AG
- Applicant Address: CH Zug
- Assignee: OVD KINEGRAM AG
- Current Assignee: OVD KINEGRAM AG
- Current Assignee Address: CH Zug
- Agency: Hoffmann & Baron, LLP
- Priority: DE102011119598 20111129
- International Application: PCT/EP2012/073855 WO 20121128
- International Announcement: WO2013/079542 WO 20130606
- Main IPC: G02B5/18
- IPC: G02B5/18 ; G02B5/28 ; B42D25/29 ; G02B5/00 ; B42D25/405

Abstract:
The invention relates to an optically variable element as well as a method for the production thereof. In a first area the optically variable element has at least one first color region which in the event of illumination generates a color dependent on the angle of observation and/or angle of illumination. The first color region has two or more zones (41 to 47) arranged next to each other. The two or more zones arranged next to each other have in each case a width and/or length dimension of less than 300 μm. In at least one first zone (41) of the zones (41 to 47) of the first color region a thin-film interference filter (15) is provided with at least one interference layer (17). The interference layer (17) of the thin-film interference filter (15) has a first average thickness (d1) in the first zone (41). The first average thickness is chosen such that the thin-film interference filter (15) in the event of illumination at least one particular angle of observation and/or angle of illumination generates, by means of interference, a color which differs from at least one color which is generated in the event of illumination at this angle of observation and/or angle of illumination in at least one of the other zones (42 to 47) of the first color region.
Public/Granted literature
- US20140346766A1 Optically Variable Element Public/Granted day:2014-11-27
Information query