Method and device for producing colored individualized holograms

US8736933B2 · kind B2 · utility

Assignee

• BUNDESDRUCKEREI GMBH · DE

Inventors

• Andre Leopold · Berlin, DE
• Christian Kunath · Dresden, DE
• Jens Ehreke · Berlin, DE
• Gerhard Hochenbleicher · Fürstenfeldbruck, DE
• Christian Klepzig · Birkenfeld, DE
• Michael Langgassner · Pliening, DE

Key dates

• Filing date: Sep 3, 2008
• Grant date: May 27, 2014
• Expiry date: Apr 11, 2031

Classification

• Technology area (CPC G): Physics
• CPC primary: G03H2225/61
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

A method produces colored individualized holograms for use as security elements for documents, and to a device for producing individualized holograms. The method generates light formed of different colors, spatially modulates the light, color by color, in an individual manner, optically guides the modulated light such that the light is at least partially refracted and/or reflected on a holographic master and is superposed in a holographic recording material with the modulated non-refracted and/or reflected light, and records the hologram. The light is modulated, color by color and at the same time, by a plurality of spatial light modulators. Every color is associated with its own spatial light modulator and a plurality of monochrome modulated light beams of the plurality of colors is combined in a collinear manner prior to refraction and/or reflection on the holographic master and the superposition in the recording material to give a multicolor exposure light beam.