Patent US4330604A successfully refreshed from Google Patents.
US4330604A
Expired / Lapsed
US
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Fabrication of holograms on plastic substrates
Assignee: Dai Nippon Printing Co Ltd
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Filing: 1980-08-04
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Granted: 1982-05-18
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Expires: 2000-08-04
Abstract
Abstract An improved process is provided for attaching layers of hydrophilic, photosensitive materials onto hydrophobic plastic substrates, which comprises forming a layer of a polycrystalline, optically transparent, moisture barrier material on the substrate, followed by depositing thereon a layer of a hydrophilic, polar material, prior to depositing the photosensitive layer thereon. The process is especially suitable for the fabrication of pre-holographic elements and holograms. Holograms are fabricated by exposing and developing latent images in the photosensitive layer of pre-holographic elements and attaching to the photosensitive layer by an optical adhesive a protective cover layer comprising a plastic substrate coated with the moisture barrier material and the hydrophilic material. Additional moisture barrier protection may optionally be provided by forming a combination of moisture barrier layers and hydrophilic layers on the outer surfaces of the plastic substrates.
Inventors
- 👤 John E. Wreede
- 👤 Andrejs Graube
- 👤 Mark A. Mulvihill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:59
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/66; G03C1/76; G03C1/91; G03H; G03H2250/00; G03H2250/12; Y; Y10; Y10S; Y10S359/00; Y10S359/90; Y10S430/00; Y10S430/146; Y10S430/155; Y10S430/162
Claims Analysis
Total Claims: 39
Claim 1
Independent Claim
117 words
A process for fabricating a pre-holographic element supported on an optically transparent hydrophobic substrate which comprises: (a) forming a layer of a polycrystalline, optically transparent, moisture barrier material on at least a portion of the hydrophobic substrate by a process which generates a temperature at the substrate of less than that of its softening point at which it deforms; (b) forming a layer of a hydrophilic, polar material on at least a portion of the moisture barrier layer by a process which generates a temperature at the substrate less than that of its softening point; and (c) forming a layer of a hydrophilic, photosensitive material on at least a portion of the layer of hydrophilic, polar material.
Claim 2
Dependent Claim
117 words
A process for fabricating a pre-holographic element supported on an optically transparent hydrophobic substrate which comprises: (a) forming a layer of a polycrystalline, optically transparent, moisture barrier material on at least a portion of the hydrophobic substrate by a process which generates a temperature at the substrate of less than that of its softening point at which it deforms; (b) forming a layer of a hydrophilic, polar material on at least a portion of the moisture barrier layer by a process which generates a temperature at the substrate less than that of its softening point; and (c) forming a layer of a hydrophilic, photosensitive material on at least a portion of the layer of hydrophilic, polar material.
Claim 3
Dependent Claim
27 words
The process of claim 1 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 4
Dependent Claim
21 words
The process of claim 2 in which the plastic material is selected from the group consisting of poly-(methyl methacrylate) and polycarbonate.
Claim 5
Dependent Claim
41 words
The process of claim 1 in which the moisture barrier layer provides a barrier against diffusion of water vapor such that over the lifetime of the pre-holographic element, no more than about 2×10 -6 g H 2 O/cm 2 is transmitted.
Claim 6
Dependent Claim
25 words
The process of claim 4 in which the moisture barrier material comprises a material selected from the group consisting of silicon nitride and silicon oxynitride.
Claim 7
Dependent Claim
19 words
The process of claim 5 in which the moisture barrier layer consists essentially of Si 3 N 4 .
Claim 8
Dependent Claim
21 words
The process of claim 1 in which the thickness of the moisture barrier layer ranges from about 0.1 to 1 μm.
Claim 9
Dependent Claim
20 words
The process of claim 1 in which the moisture barrier layer is deposited by electron beam evaporation or plasma-enhanced deposition.
Claim 10
Dependent Claim
26 words
The process of claim 1 in which the hydrophilic, polar layer comprises a material selected from the group consisting of silica, soft glasses and silicon oxynitride.
Claim 11
Dependent Claim
16 words
The process of claim 9 in which the hydrophilic layer consists essentially of SiO 2 .
Claim 12
Dependent Claim
21 words
The process of claim 1 in which the thickness of the hydrophilic, polar layer ranges from about 0.1 to 0.5 μm.
Claim 13
Dependent Claim
20 words
The process of claim 1 in which the hydrophilic, polar layer is deposited by electron beam evaporation or plasma-enhanced deposition.
Claim 14
Dependent Claim
20 words
The process of claim 1 in which the moisture barrier layer and the hydrophilic, polar layer are co-deposited substantially simultaneously.
Claim 15
Dependent Claim
25 words
The process of claim 1 in which the moisture barrier layer and the hydrophilic, polar layer are deposited so as to form a graded layer.
Claim 16
Dependent Claim
12 words
The process of claim 1 in which the photosensitive material is gelatin-based.
Claim 17
Dependent Claim
28 words
The process of claim 15 in which the photosensitive material comprises an emulsion selected from the group consisting of dichromated gelatin, photographic silver halide emulsion and diazo gelatin.
Claim 18
Dependent Claim
8 words
Product produced by the process of claim 1.
Claim 19
Dependent Claim
79 words
A process for fabricating a hologram on the pre-holographic element of claim 1 which comprises: (a) exposing the photosensitive layer to an actinic interference pattern to record a latent image thereon; (b) developing the photosensitive layer to obtain the recorded latent image; and (c) forming a protective layer on at least a portion of the photosensitive layer, the protective layer including a layer of a polycrystalline, optically transparent, moisture barrier material and a layer of a hydrophilic, polar material.
Claim 20
Dependent Claim
45 words
The process of claim 15 in which the protective layer comprises an optically transparent cover material coated with a layer of the moisture barrier material and a layer of the hydrophilic, polar material, the protective layer attached to the photosensitive layer through the hydrophilic layer.
Claim 21
Dependent Claim
174 words
A process for fabricating a hologram which comprises: (a) forming a layer of a polycrystalline, optically transparent, moisture barrier material on at least a portion of an optically transparent hydrophobic substrate by a process which generates a temperature at the substrate of less than that of its softening point at which it deforms; (b) forming a layer of a hydrophilic, polar material on at least a portion of the moisture barrier layer by a process which generates a temperature at the substrate less than that of its softening point; (c) forming a layer of a hydrophilic, photosensitive material on at least a portion of the layer of hydrophilic, polar material; (d) exposing the photosensitive layer to an actinic interference pattern to record a latent image thereon; (e) developing the photosensitive layer to obtain the recorded latent image; and (f) forming a protective layer on at least a portion of the photosensitive layer, the protective layer including a layer of a polycrystalline, optically transparent, moisture barrier material and a layer of a hydrophilic, polar material.
Claim 22
Dependent Claim
174 words
A process for fabricating a hologram which comprises: (a) forming a layer of a polycrystalline, optically transparent, moisture barrier material on at least a portion of an optically transparent hydrophobic substrate by a process which generates a temperature at the substrate of less than that of its softening point at which it deforms; (b) forming a layer of a hydrophilic, polar material on at least a portion of the moisture barrier layer by a process which generates a temperature at the substrate less than that of its softening point; (c) forming a layer of a hydrophilic, photosensitive material on at least a portion of the layer of hydrophilic, polar material; (d) exposing the photosensitive layer to an actinic interference pattern to record a latent image thereon; (e) developing the photosensitive layer to obtain the recorded latent image; and (f) forming a protective layer on at least a portion of the photosensitive layer, the protective layer including a layer of a polycrystalline, optically transparent, moisture barrier material and a layer of a hydrophilic, polar material.
Claim 23
Dependent Claim
27 words
The process of claim 20 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 24
Dependent Claim
21 words
The process of claim 21 in which the plastic material is selected from the group consisting of poly(methyl methacrylate) and polycarbonate.
Claim 25
Dependent Claim
25 words
The process of claim 22 in which the moisture barrier material comprises a material selected from the group consisting of silicon nitride and silicon oxynitride.
Claim 26
Dependent Claim
19 words
The process of claim 23 in which the moisture barrier layer consists essentially of Si 3 N 4 .
Claim 27
Dependent Claim
18 words
The process of claim 20 in which the moisture barrier layer ranges from about 0.1 to 1 μm.
Claim 28
Dependent Claim
20 words
The process of claim 20 in which the moisture barrier layer is deposited by electron beam evaporation or plasma-enhanced deposition.
Claim 29
Dependent Claim
26 words
The process of claim 20 in which the hydrophilic, polar layer comprises a material selected from the group consisting of silica, soft glasses and silicon oxynitride.
Claim 30
Dependent Claim
16 words
The process of claim 27 in which the hydrophilic layer consists essentially of SiO 2 .
Claim 31
Dependent Claim
21 words
The process of claim 20 in which the thickness of the hydrophilic, polar layer ranges from about 0.1 to 0.5 μm.
Claim 32
Dependent Claim
20 words
The process of claim 20 in which the hydrophilic, polar layer is deposited by electron beam evaporation or plasma-enhanced deposition.
Claim 33
Dependent Claim
20 words
The process of claim 20 in which the moisture barrier layer and the hydrophilic, polar layer are co-deposited substantially simultaneously.
Claim 34
Dependent Claim
25 words
The process of claim 20 in which the moisture barrier layer and the hydrophilic, polar layer are deposited so as to form a graded layer.
Claim 35
Dependent Claim
12 words
The process of claim 20 in which the photosensitive material is gelatin-based.
Claim 36
Dependent Claim
28 words
The process of claim 33 in which the photosensitive material comprises an emulsion selected from the group consisting of dichromated gelatin, photographic silver halide emulsion and diazo gelatin.
Claim 37
Dependent Claim
45 words
The process of claim 20 in which the protective layer comprises an optically transparent cover material coated with a layer of the moisture barrier material and a layer of the hydrophilic, polar material, the protective layer attached to the photosensitive layer through the hydrophilic layer.
Claim 38
Dependent Claim
28 words
The process of claim 20 further comprising forming a mixture of moisture barrier layers and hydrophilic, polar layers on the outer surfaces of the substrate and cover layer.
Claim 39
Dependent Claim
8 words
Product produced by the process of claim 20.
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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) | 1985-05-17 | 1985-11-16 | 1986-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-17 | 1989-11-16 | 1990-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-17 | 1993-11-16 | 1994-05-18 | $7700.00 | Window Closed / Lapsed |