Hologram Industries Research Gmbh

Günther Dausmann

Irina Menz

Hugues Souparis

Zishao Yang

Philippe Huet

Andreas Wanke

The present invention relates to a display apparatus for superimposing a virtual image into the field of vision of a user of the display apparatus, having spectacles for the user and at least one projection device for producing light rays which are transferred by means of an optical unit of the spectacles into a beam path which produces a virtual image for the user. The optical unit may comprise a ground-glass screen or lens array and a holographic optical imaging unit. The ground-glass screen or lens array and holographic optical imaging unit are arranged in such a way that the light rays produced by the projection device are incident on the holographic optical imaging unit through the ground-glass screen or the lens array and are transferred by the holographic optical imaging unit into the beam path which produces the virtual image for the user.

Display apparatus for superimposing a virtual image into the field of vision of a user

A description is given of a document with a hologram as a security feature, in particular an identity card (), consisting of a polycarbonate card body (), which has a volume hologram label () embedded therein. A description is additionally given of a method for producing the document, in which volume hologram labels () arranged on a carrier sheet are brought into contact with adhesive regions () on a thermoplastic sheet (), the adhesive surfaces are cured and the carrier sheet is then removed. A second plastics sheet () is then adhesively bonded onto the first plastics sheet (), bearing the hologram labels, using a second adhesive () in the region of the hologram labels () to form a two-layered sheet composite () which, finally, is laminated, together with further thermoplastic sheets, in a card-lamination press, under the action of pressure and temperature, to give a card body (), individual identity cards () being punched out.

Document with hologram, and method of producing same

A method and a device are described for producing copies/replica of a volume reflection hologram wherein a holographic film () is guided over a drum with polygon cross-section having at least two planar (polygon) master surfaces () to each of which at least one master () is attached in the circumferential direction, where the film is brought into contact with at least one master hologram () and its entire surface is exposed to laser. It is essential that to at least one of the master surfaces () with the film guided over it, a laser exposure unit () is assigned which allows full exposure of the respective master surface to parallel, coherent laser beams (), and that the at least one exposure unit () follows section wise the rotational movement of the drum by a splitting angle with equal velocity and exposes the corresponding master surface () to then be reset quickly again and perform the same angular displacement and exposure together with the next master surface. In this manner, a highly productive multiplication even of large reflection holograms in high quality is possible.

Method and device for producing contact copies

A method and an apparatus are described for producing a volume transmission hologram and/or a volume reflection hologram from a film () having a backing foil () and a holographic layer (). In said method, the film () is guided over a drum (), on which the film () is brought in contact with the master hologram (). The master hologram () and the film () are simultaneously moved through an exposure zone (). In the exposure zone (), the film () and the master hologram () are irradiated with a linearly expanding exposure laser beam () in order to reproduce the master hologram () in the photopolymer layer (). Both volume reflection and volume transmission holograms can be produced in the polymer layer () of the film () that is guided over the drum by means of only one drum (). For this purpose, two master holograms () are or can be associated with the drum and are moved in synchrony therewith while lying thereon, the film () being located radially below the first master hologram () and/or radially above the second master hologram ().

Method and apparatus for the production of volume transmission and/or reflection holograms

In a method for production of documents with a hologram and a document with a hologram, wherein, in a first step, a hologram is exposed in a photographic film and, in a second step, the photographic film is applied to a document support, the individualisation of the holograms first occurs during the gluing or after the gluing to the printed personal document or to the protective film provided for the surface protection of the document. It is thus possible to produce in a secure and economical fashion documents with individual holographic information of greater visibility and with further novel security features.

Growing community of inventors

Grasbrunn, Germany

Günther Dausmann