Optically variable element

US10195889B2 · kind B2 · utility

Assignees

• LEONHARD KURZ Stiftung & Co. KG · DE
• OVD Kinegram AG · CH

Inventors

• Ludwig Brehm · Höchstadt an der Aisch, DE
• Sebastian Mader · Hilden, DE
• Andreas Schilling · Hagendorn, CH
• Wayne Robert Tompkin · Baden, CH
• Harald Walter · Horgen, CH

Key dates

• Filing date: May 6, 2014
• Grant date: Feb 5, 2019
• Expiry date: Feb 1, 2035

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B42D2035/50
• WIPO field: Other consumer goods
• WIPO sector: Other fields

Abstract

An optically variable element has first and second diffraction gratings which are high-frequency and therefore act reflectively into the zero diffraction order. Either a first color is generated by the first diffraction grating at a particular angle of rotation and a particular angle of illumination and simultaneously a second color, different from the first color, is generated by the second diffraction grating or a visible color is generated essentially only by the first diffraction grating at a first angle of rotation and a visible color is generated essentially only by the second diffraction grating at a second angle of rotation.