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Encapsulated Holographic Media

IP.com Disclosure Number: IPCOM000030783D
Publication Date: 2004-Aug-26
Document File: 12 page(s) / 88K

Publishing Venue

The IP.com Prior Art Database

Related People

Eric S. Kolb: INVENTOR [+2]

Abstract

This invention provides for a hologram recording medium comprising a hologram recording material, such as a photopolymer or photopolymerizable material, sandwiched between substrates disposed in an opposing orientation, such as for the case of upper and lower substrates, wherein said the medium incorporates a material or materials for encapsulating the hologram recording material thereby preventing the exudation of components of the said recording material from the recording medium. The substrates of said hologram recording medium preferably are in a substantially coplanar geometry so that the outer surfaces of said substrates are substantially parallel, and at least one of the substrates is substantially transparent. The substrates of the hologram recording medium have peripheral edges separated in the direction perpendicular to the surface of the substrate by a distance associated with the thickness of the hologram recording material. The peripheral edges of the adjoined substrates are preferably aligned in a substantially planar arrangement but other suitable arrangements may be used. For instance, the peripheral edges of the substrates can be aligned in a non-planar or offset arrangement, or a combination thereof.

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Field of the Invention

This invention relates to a method of encapsulating the exposed edge, such as peripheral edges, or surface of holographic media so as to prevent exudation of formulation components, such as a diffusible oil or mobile binder moiety or monomers or oligomers and the like, or combinations thereof.  Exudation of said components leads to a change in the chemical composition of the recording media, and in turn, leads to a deterioration in the media performance and can have a negative impact on data lifetime.

Brief description of the Drawings

The following drawings are provided to illustrate the various features and advantages of this invention.

  Figure 1. Cross sectional view of a hologram recording material or media with an edge encapsulant layer comprising a Hot Melt adhesive or thermoplastic material that seals the aligned peripheral edge.

Figure 2. Cross sectional view of a hologram recording material or media of this invention constructed with an edge encapsulating layer comprising a Hot Melt adhesive or thermoplastic material sealing an “off set” peripheral edge.

Figure 3. Cross sectional view of a hologram recording medium or media of this invention constructed with an edge encapsulating layer comprising a pressure sensitive adhesive tape.

Figure 4. Schematic depicting the edge sealing process using an induction generator to activate the edge encapsulating material.

Figure 5. Cross sectional view of a hologram recording medium or media of this invention constructed with an edge encapsulating layer which is provided by an induction sealing process.  A. Encapsulant overlapping the outer surface of the hologram recording media.  B. Encapsulant covering only the peripheral edge of the hologram recording media.

Figure 6. Schematic depicting the edge sealing process using an induction generator to activate the edge encapsulating material on a disk-like media.

Detailed Description of the Invention

This invention provides for a hologram recording medium comprising a hologram recording material, such as a photopolymer or photopolymerizable material, sandwiched between substrates disposed in an opposing orientation, such as for the case of upper and lower substrates, wherein said the medium incorporates a material or materials for encapsulating the hologram recording material thereby preventing the exudation of components of the said recording material from the recording medium.  The substrates of said hologram recording medium preferably are in a substantially coplanar geometry so that the outer surfaces of said substrates are substantially parallel, and at least one of the substrates is substantially transparent. The substrates of the hologram recording medium have peripheral edges separated in the direction perpendicular to the surface of the substrate by a distance associated with the thickness of the hologram recording material.  The peripheral edges of the adjoined substrates are preferably aligned in a substanti...