Method and device for producing contact copies
US8810766B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 7, 2011 |
| Grant date | Aug 19, 2014 |
| Priority date | — |
| Expiry date | Jul 25, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03H2270/31
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A method and a device are described for producing copies/replica of a volume reflection hologram wherein a holographic film (4) is guided over a drum with polygon cross-section having at least two planar (polygon) master surfaces (3) to each of which at least one master (7) is attached in the circumferential direction, where the film is brought into contact with at least one master hologram (7) and its entire surface is exposed to laser. It is essential that to at least one of the master surfaces (5) with the film guided over it, a laser exposure unit (22) is assigned which allows full exposure of the respective master surface to parallel, coherent laser beams (6), and that the at least one exposure unit (22) follows section wise the rotational movement of the drum by a splitting angle with equal velocity and exposes the corresponding master surface (5) 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.