US4329409A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for fabricating stable holograms
Assignee: Dai Nippon Printing Co Ltd
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Filing: 1980-08-04
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Granted: 1982-05-11
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Expires: 2000-08-04
Abstract
Abstract An improved method for fabricating a light weight dichromated gelatin hologram package on plastic or glass substrates is provided. The prior art cover plate protecting the gelatin layer is eliminated by depositing on the gelatin a material providing a barrier to atmospheric moisture and possessing abrasion-resistant properties. In one embodiment, the photosensitive gelatin layer is deposited on a plastic substrate employing at least one subbing layer which provides a barrier to atmospheric moisture. Protection of the gelatin layer is provided by a plasma deposited silicon nitride film thereon.
Inventors
- 👤 John E. Wreede
- 👤 Andrejs Graube
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:30
CPC Classifications
G; G03; G03H; G03H1/00; G03H1/02; G03H1/0252; G03C; G03C1/00; G03C1/66; G03C11/00; G03C11/08; G03H1/024; G03H1/0248; G03H1/04; G03H1/18; G03H2001/186; G03H2250/00; G03H2250/12; G03H2250/32; G03H2250/37; G03H2250/39; G03H2260/00; G03H2260/10; Y; Y10; Y10S; Y10S359/00; Y10S359/90; Y10S430/00; Y10S430/162
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
132 words
In a process for fabricating a hologram which comprises: (a) forming a layer of a hydrophilic, photosensitive material on at least a portion of a substrate; (b) exposing the photosensitive layer to an actinic interference pattern to record a latent image thereon; (c) developing the photosensitive layer to obtain the recorded latent image; and (d) forming a protective layer on at least a portion of the photosensitive layer, the improvement which comprises depositing on the layer of photosensitive material a protective cover layer including: (a) a moisture barrier layer less than about 5 μm thick which provides a barrier against diffusion of water vapor such that over the lifetime of the hologram, no more than about 2×10 -6 g H 2 O/cm 2 is transmitted therethrough; and (b) a hard, abrasion-resistant layer.
Claim 2
Dependent Claim
132 words
In a process for fabricating a hologram which comprises: (a) forming a layer of a hydrophilic, photosensitive material on at least a portion of a substrate; (b) exposing the photosensitive layer to an actinic interference pattern to record a latent image thereon; (c) developing the photosensitive layer to obtain the recorded latent image; and (d) forming a protective layer on at least a portion of the photosensitive layer, the improvement which comprises depositing on the layer of photosensitive material a protective cover layer including: (a) a moisture barrier layer less than about 5 μm thick which provides a barrier against diffusion of water vapor such that over the lifetime of the hologram, no more than about 2×10 -6 g H 2 O/cm 2 is transmitted therethrough; and (b) a hard, abrasion-resistant layer.
Claim 3
Dependent Claim
14 words
The process of claim 1 in which the substrate consists essentially of a glass.
Claim 4
Dependent Claim
17 words
The process of claim 1 in which the substrate consists essentially of an optically transparent hydrophobic plastic.
Claim 5
Dependent Claim
61 words
The process of claim 3 in which prior to forming the layer of photosensitive material on the substrate, a layer of an optically transparent, polar, moisture barrier material is formed on at least a portion of the plastic substrate by a process which generates a temperature at the substrate of less than that of its softening point at which it deforms.
Claim 6
Dependent Claim
27 words
The process of claim 4 in which the hydrophobic substrate includes a plastic material selected from the group consisting of cellulose-acetate, polystyrene, polyester, poly-(methyl methacrylate) and polycarbonate.
Claim 7
Dependent Claim
42 words
The process of claim 4 in which the moisture barrier material comprises a material selected from the group consisting of silicon nitride, silicon oxynitride, silica, borate glasses, borosilicate glasses and glasses having a high coefficient of expansion of about 10 -5 /°C.
Claim 8
Dependent Claim
12 words
The process of claim 1 in which the photosensitive material is gelatin-based.
Claim 9
Dependent Claim
28 words
The process of claim 7 in which the photosensitive material comprises an emulsion selected from the group consisting of dichromated gelatin, photographic silver halide emulsion and diazo gelatin.
Claim 10
Dependent Claim
29 words
The process of claim 7 in which a layer providing a smoothing surface is formed on the layer of photosensitive material prior to forming the protective cover layer thereon.
Claim 11
Dependent Claim
15 words
The process of claim 9 in which the smoothing surface layer consists essentially of parylene.
Claim 12
Dependent Claim
37 words
The process of claim 1 in which the moisture barrier layer comprising the protective cover layer consists essentially of at least one member selected from the group consisting of SiO 2 and Si 3 N 4 .
Claim 13
Dependent Claim
25 words
The process of claim 1 in which the moisture barrier layer comprising the protective cover layer and the abrasion-resistant layer are one and the same.
Claim 14
Dependent Claim
18 words
The process of claim 12 in which the abrasion-resistant layer consists essentially of Si 3 N 4 .
Claim 15
Dependent Claim
22 words
The process of claim 13 in which the thickness of the Si 3 N 4 ranges from about 0.2 to 0.5 μm.
Claim 16
Dependent Claim
28 words
The process of claim 13 in which a layer of SiO 2 is about 0.1 to 0.2 μm thick is deposited over the Si 3 N 4 layer.
Claim 17
Dependent Claim
15 words
The process of claim 1 in which the abrasion-resistant layer also includes an anti-reflection coating.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-05-10 | 1985-11-09 | 1986-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-10 | 1989-11-09 | 1990-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-10 | 1993-11-09 | 1994-05-11 | $7700.00 | Window Closed / Lapsed |