Hybrid reflection hologram

a hybrid reflection and hologram technology, applied in the field of hybrid reflection holograms, can solve the problems of little more difficult to view a real image, less quality of playback image, and less ability of hologram itself to act as a guide for the viewer

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a hybrid reflection and hologram technology, applied in the field of hybrid reflection holograms, can solve the problems of little more difficult to view a real image, less quality of playback image, and less ability of hologram itself to act as a guide for the viewer

US20070223074A1Inactive Publication Date: 2007-09-27HARRIS KEN R

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[0044] A hybrid reflection hologram of the present invention was produced as follows:

[0045] 1. A limited aperture white light transmission hologram of the size required was made.

[0046] 2. The transmission hologram should be of high diffraction quality for best results. For this example, certain areas of a transmission hologram were exposed using a hinge point method commonly known in the industry to enable the separation of colors in the finished limited aperture white light hologram. It may be advantageous to make the color slits as narrow as possible in order to maximize the diffractive color range of the finished white light transmission hologram. Additional areas of the hologram were exposed using an open aperture and then were combined with the areas previously exposed.

[0047] 3. A photosensitive photoresist, commonly used in embossed holography, was used as the recording medium. The hologram was developed in the normal manner.

[0048] 4. When the hologram was finished it was ...

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Abstract

Hybrid white-light viewable holograms and methods for making them. The holograms are hybrid reflection holograms made using the diffractive structures or gratings of a holographic object such as a transmission hologram or holographic optical element (HOE). The wavefronts of the diffractive structures are converted into a reflection hologram by scanning them with a coherent light source having a profiled narrow beam. The hybrid reflection hologram can exhibit display parameters including the multiple colors, solidity, and color stability of white light reflection holograms, the diffractive color shifting of a white light transmission hologram, three dimensional imaging and a wide variety of dynamic changes. Different areas or images with each of these effects can be combined in a single hologram. These hybrid reflection holograms are ideal for security and forgery prevention applications.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This application claims the benefit of the filing of U.S. Provisional Patent Application Ser. No. 60 / 783,502, entitled “Method and Apparatus for Mass Production of Volume Holograms from Plane Holograms”, filed on Mar. 17, 2006. This application is also a continuation-in-part application of U.S. patent application Ser. No. 11 / 459,821, entitled “Method and Apparatus for Mass Production of Holograms”, filed on Jul. 25, 2006, which application claims the benefit of the filing of U.S. Provisional Patent Application Ser. No. 60 / 702,785, entitled “Method and Apparatus for Mass Production of Reflection Holograms and Volume Holographic Optical Elements”, filed on Jul. 26, 2005. The specifications and claims of these patent applications are incorporated herein by reference.BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention (Technical Field) [0003] The present invention is a method and apparatus for making a reflection hologram (or volum...

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Application Information

Patent Timeline

27 Sep 2007

Publication

US20070223074A1

IPC: G03H1/26

CPC: G03H1/0011; G03H2240/52; G03H1/0248; G03H1/0406; G03H1/0408; G03H1/0465; G03H1/202; G03H2001/0417

Inventors: HARRIS, KEN R.