US4970129A
Expired / Lapsed
US
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Holograms
Assignee: Polaroid Corp
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Filing: 1988-03-30
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Granted: 1990-11-13
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Expires: 2008-03-30
Abstract
Abstract Volume phase holograms and other holographic elements are disclosed which include microscopic areas of a material having an index of refraction different from that of the holographic fringes.
Inventors
- 👤 Richard T. Ingwall
- 👤 Mark A. Troll
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:49
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/0005; G03F7/001; G03H; G03H1/00; G03H1/02; G03H2260/00; G03H2260/10; G03H2260/12; Y; Y10; Y10S; Y10S359/00; Y10S359/90
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
42 words
A volume phase holographic element formed by holographic exposure of a photopolymerizable element, characterized in that microvoids between fringes are at least partially filled with a material other than air, said material having a refractive index different from that of the matrix.
Claim 2
Dependent Claim
42 words
A volume phase holographic element formed by holographic exposure of a photopolymerizable element, characterized in that microvoids between fringes are at least partially filled with a material other than air, said material having a refractive index different from that of the matrix.
Claim 3
Dependent Claim
21 words
A volume phase holographic element as defined in claim 1 wherein said refractive index is lower than that of the matrix.
Claim 4
Dependent Claim
21 words
A volume phase holographic element as defined in claim 1 wherein said refractive index is higher than that of the matrix.
Claim 5
Dependent Claim
44 words
A volume phase holographic element characterized in that microvoids between fringes are at least partially filled with a material other than air, said material having a refractive index different from that of the matrix, said matrix comprising branched polyethylenimine and a polymerized ethylenic monomer.
Claim 6
Dependent Claim
44 words
A volume phase holographic element characterized in that microvoids between fringes are at least partially filled with a material other than air, said material having a refractive index different from that of the matrix, said matrix comprising branched polyethylenimine and a polymerized ethylenic monomer.
Claim 7
Dependent Claim
17 words
A volume phase holographic element as defined in claim 4 wherein said monomer is an acrylic acid.
Claim 8
Dependent Claim
15 words
A volume phase holographic element as defined in claim 1 wherein said material is hydrophobic.
Claim 9
Dependent Claim
47 words
A volume phase holographic element characterized in that microvoids between fringes are at least partially filled with a material other than air, said material having a refractive index lower than that of the matrix, said material having a lower index of refraction is a polymerized fluorinated monomer.
Claim 10
Dependent Claim
47 words
A volume phase holographic element characterized in that microvoids between fringes are at least partially filled with a material other than air, said material having a refractive index lower than that of the matrix, said material having a lower index of refraction is a polymerized fluorinated monomer.
Claim 11
Dependent Claim
28 words
A volume phase holographic element as defined in claim 7 wherein a thin layer of said polymerized fluorinated monomer is present on the surface of said holographic element.
Claim 12
Dependent Claim
52 words
A volume phase holographic element characterized in that microvoids between fringes are at least partially filled with a material other than air, said material having a refractive index different from that of the matrix, wherein said material is a material capable of absorbing light of a wavelength reflected by said holographic element.
Claim 13
Dependent Claim
52 words
A volume phase holographic element characterized in that microvoids between fringes are at least partially filled with a material other than air, said material having a refractive index different from that of the matrix, wherein said material is a material capable of absorbing light of a wavelength reflected by said holographic element.
Claim 14
Independent Claim
69 words
The method of forming a holographic element comprising effecting a holographic exposure of a photosensitive element to laser light, developing said exposed photosensitive element to provide a volume phase holographic element having microvoids between the fringes, and at least partially filling said microvoids with a material having a different index of refraction than that of the matrix material of said holographic element, said photosensitive element being a photopolymerizable element.
Claim 15
Independent Claim
69 words
The method of forming a holographic element comprising effecting a holographic exposure of a photosensitive element to laser light, developing said exposed photosensitive element to provide a volume phase holographic element having microvoids between the fringes, and at least partially filling said microvoids with a material having a different index of refraction than that of the matrix material of said holographic element, said photosensitive element being a photopolymerizable element.
Claim 16
Independent Claim
83 words
The method of forming a holographic element comprising effecting a holographic exposure of a photosensitive element to laser light, developing said exposed photosensitive element to provide a volume phase holographic element having microvoids between the fringes, and at least partially filling said microvoids with a material having a different index of refraction than that of the matrix material of said holographic element, said photosensitive element being a photopolymerizable element comprising a dye sensitizer, branched polyethylenimine, and a free radical polymerizable ethylenic unsaturated monomer.
Claim 17
Independent Claim
83 words
The method of forming a holographic element comprising effecting a holographic exposure of a photosensitive element to laser light, developing said exposed photosensitive element to provide a volume phase holographic element having microvoids between the fringes, and at least partially filling said microvoids with a material having a different index of refraction than that of the matrix material of said holographic element, said photosensitive element being a photopolymerizable element comprising a dye sensitizer, branched polyethylenimine, and a free radical polymerizable ethylenic unsaturated monomer.
Claim 18
Independent Claim
72 words
The method of forming a holographic element comprising effecting a holographic exposure of a photosensitive element to laser light, developing said exposed photosensitive element to provide a volume phase holographic element having microvoids between the fringes, and at least partially filling said microvoids by introducing a polymerizable monomer into said microvoids, and then polymerizing said monomer to provide in said microvoids a material having a lower index of refraction than said matrix.
Claim 19
Independent Claim
72 words
The method of forming a holographic element comprising effecting a holographic exposure of a photosensitive element to laser light, developing said exposed photosensitive element to provide a volume phase holographic element having microvoids between the fringes, and at least partially filling said microvoids by introducing a polymerizable monomer into said microvoids, and then polymerizing said monomer to provide in said microvoids a material having a lower index of refraction than said matrix.
Claim 20
Dependent Claim
14 words
The method as defined in claim 12 wherein said monomer is a fluorinated monomer.
Claim 21
Dependent Claim
25 words
The method as defined in claim 12, including the step of polymerizing a thin layer of said monomer on the surface of said holographic element.
Claim 22
Dependent Claim
46 words
A volume phase holographic element characterized in that microvoids between fringes are at least partially filled with a polymer formed by introducing a monomer into said microvoids and polymerizing said monomer in said microvoids, said polymer having a refractive index different from that of the matrix.
Claim 23
Dependent Claim
46 words
A volume phase holographic element characterized in that microvoids between fringes are at least partially filled with a polymer formed by introducing a monomer into said microvoids and polymerizing said monomer in said microvoids, said polymer having a refractive index different from that of the matrix.
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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) | 1993-11-12 | 1994-05-14 | 1994-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-11-12 | 1998-05-14 | 1998-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-11-12 | 2002-05-14 | 2002-11-13 | $7700.00 | Window Closed / Lapsed |