US 5,606,433 AGranted

Lamination of multilayer photopolymer holograms

AssigneeHughes Electronics Corporation

InventorsKhin S. Yin, Kevin H. Yu, John E. Wreede

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Abstract

A process for making a multilayer photopolymer hologram structure without intervening adhesive layers between component photopolymer layers. The process includes the steps of exposing a first photopolymer recording layer to hologram forming light, exposing the holographically exposed first photopolymer recording layer to UV light to partially UV harden the first photopolymer recording layer, exposing a second photopolymer recording layer to hologram forming light, exposing the holographically exposed second photopolymer recording layer to UV light for a time interval that is sufficiently short to preserve the tackiness of the second photopolymer recording layer, laminating the second photopolymer recording layer onto the first photopolymer recording layer to form a laminar photopolymer structure having top and bottom photopolymer surfaces, baking the laminar photopolymer structure while subjecting the top and bottom surfaces thereof to the uniform pressure, and exposing the laminar photopolymer structure to UV light.

Claims4

Dependent claims

A process for making a multilayer photopolymer hologram structure comprising:

(a) exposing a first photopolymer recording layer to hologram forming light;
(b) exposing the holographically exposed first photopolymer recording layer to UV light to partially UV harden the photopolymer recording layer;
(c) exposing a second photopolymer recording layer to hologram forming light;
(d) exposing the holographically exposed second photopolymer recording layer to UV light for a time interval that is sufficiently short to maintain the tackiness of the second photopolymer recording layer;
(e) laminating the second photopolmyer recording layer with the first photopolymer recording layer to form a two layer laminar photopolyer structure having a Top surface and a bottom surface, wherein the second photopolymer layer is in direct laminar contact with the first photopolymer layer;
(f) exposing the second photopolymer recording layer to UV light to partially UV harden the second photopolymer recording layer;
(g) applying a uniform pressure to the top and bottom surfaces of the two layer laminar photopolymer structure, including the steps of
(i) placing the laminar photopolymer structure into a vacuum bag, and
(ii) evacuating the vacuum bag;
(h) baking the two layer laminar photopolymer structure while applying a uniform pressure to the top and bottom surfaces of the two layer laminar photopolymer structure;
and
(i) exposing the two layer laminar photopolymer structure to UV light.

9 more elements

A process for making a multilayer photopolyer hologram structure comprising:

(a) exposing a first photopolymer recording layer to hologram forming light;
(b) exposing the holographically exposed first photopolymer recording layer to UV light to partially UV harden the photopolymer recording layer;
(c) exposing a second photopolymer recording layer to hologram forming light;
(d) exposing the holographically exposed second photopolymer recording layer to UV light for a time interval that is sufficiently short to maintain the tackiness of the second photopolymer recording layer;
(e) laminating the second photopolymer recording layer onto the first photopolymer recording layer to form a two layer laminar photopolymer structure having a stop surface and a bottom surface;
(f) exposing the second photopolyer recording layer to UV light to partially UV harden the second photopolymer recording layer;
(e) baking the two layer laminar photopolymer structure while applying a uniform pressure to the top and bottom surfaces of the two layer laminar photopolymer structure, including the steps of
(i) placing the two layer laminar photopolymer structure into a vacuum bag,
(ii) baking the two layer laminar photopolymer structure, and
(iii) maintaining a vacuum in the vacuum bag during the step of baking;
and
(h) exposing the two layer laminar photopolymer structure to UV light.

9 more elements

Dependencies are inferred from the claim text.

Facts

Application: 08/298,888Filed 31 Aug 1994
Granted: 25 Feb 1997
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

G03H 1/0252
Details of features involved during the holographic process; Replication of holograms without interference recording: laminate comprising a…
G03H 1/18
Processes or apparatus for producing holograms: particular processing of hologram record carriers, e.g. for obtaining blazed holograms
G03H 1/26
Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them;…
G03H 1/182
Particular processing of hologram record carriers, e.g. for obtaining blazed holograms: post-exposure processing, e.g. latensification