Other

Giesecke & Devrient Gmbh

Bundesdruckerei Gmbh

Hsm Holographic Systems Munchen Gmbh

Gunther Dausmann

Harald Hoeppner

Benedikt Ahlers

Arnim Franz-Burgholz

Zishao Yang

Thomas Loer

Detlef Martens

Rudi De Jongh

Roland Gutmann

Robert Massen

Thomas Franz

Thomas Leitner

Detlef Maertens

Thomas Loeer

Klaus Gnadig

Jorg Eberhardt

Georg Hertl

Rudolf Mathe

The invention relates to a security system especially for security documents, wherein a security element is provided in a carrier plane, that under incident light holographically reconstructs a pattern outside the carrier plane, in which concealed information is stored and having a flat transparent verification element which on flat contact with the security element makes the information stored therein visible. The invention further relates to a security element and a verification element for use in the security system and a security document fitted with the security system. The invention additionally relates to an apparatus and a method for reading out the concealed information which is stored holographically in the pattern reconstructed on the security element under incident light.

Security system, particularly for valuable documents

Security system, especially for security documents

A method for determining the authenticity of a hologram with the following steps:

Method for checking authenticity of a hologram and a reading device for

A process for the manufacture of non-replicable holograms possessing authenticity features which are copies of a master hologram. To form a master hologram, a hologram is taken of a randomly structured optical element, for example of a ground glass screen or a diffusor. The resulting hologram forms an authenticity feature, with an optical system which leads to a hologram with a pattern of lines that are parallel to one another.

Process for the manufacture of non-replicable holograms possessing

In a method of taking and reproducing photographs in which a hologram in the substrate of the photograph is superposed on the photograph and is produced, e.g., by the Lippmann-Bragg process by an object beam and a reference beam from the same light source, the object beam containing amplitude information corresponding to the photograph in such a manner that a corresponding image is formed at the same time on the substrate which corresponds to the hologram plane, and the aperture stop of image-forming optical system contains the object to be represented by the hologram. An optical phase modulator for producing a predetermined set of phase disturbances is provided between the aperture stop and the hologram plane.

Method of producing and reproducing holograms

Method and device for the contactless measurement of movement

Growing community of inventors

Erding, Germany

Gunther Dausmann