The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 19, 2014
Filed:
Apr. 07, 2011
Günther Dausmann, Grassbrunn, DE;
Günther Dausmann, Grassbrunn, DE;
Hologram Industries Research GmbH, Pliening-Ottersberg, DE;
Abstract
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.