US4842968A
Expired / Lapsed
US
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Hologram recording medium
Assignee: Sony Corp
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Filing: 1985-12-16
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Granted: 1989-06-27
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Expires: 2005-12-16
Abstract
Abstract There is disclosed herein a hologram recording medium comprising of substrate formed of transparent and non-light scattering material having a plurality of open pores for said substrate and photopolymerization composition impregnated in said open pores. The photopolymerization composition consists essentially of a photopolymerizable monomer or oligomer which adheres to the surface of said open pores, a photopolymerization initiator and activator for controlling the photopolymerization speed.
Inventors
- 👤 Chiaki Kojima
- 👤 Hidetoshi Shimizu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 16:57
CPC Classifications
G; G03; G03H; G03H1/00; G03H1/02; G03F; G03F7/00; G03F7/0005; G03F7/001; G03H2260/00; G03H2260/12; G03H2270/00; G03H2270/53
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
128 words
A hologram recording medium comprising a rigid substrate formed of transparent and non-light scattering material having a plurality of open pores in said substrate, photopolymerizable composition impregnated in said open pores, said photopolymerizable composition consisting essentially of: a photopolymerizable material selected from the group consisting of photopolymerizable monomers or photopolymerizable oligomers having an adhesive property to surface of said open pores; a photopolymerization initiator, and an inactivator for controlling photopolymerization speed, wherein said inactivator is a material having a triplet interaction with the photopolymerization initiator, where energy emitted by said photopolymerization initiator upon returning from an excited state by irradiation of light to a ground state is partially a triplet state, and said excited inactivator dissipates energy as heat upon returning to a ground state of said inactivator.
Claim 2
Dependent Claim
128 words
A hologram recording medium comprising a rigid substrate formed of transparent and non-light scattering material having a plurality of open pores in said substrate, photopolymerizable composition impregnated in said open pores, said photopolymerizable composition consisting essentially of: a photopolymerizable material selected from the group consisting of photopolymerizable monomers or photopolymerizable oligomers having an adhesive property to surface of said open pores; a photopolymerization initiator, and an inactivator for controlling photopolymerization speed, wherein said inactivator is a material having a triplet interaction with the photopolymerization initiator, where energy emitted by said photopolymerization initiator upon returning from an excited state by irradiation of light to a ground state is partially a triplet state, and said excited inactivator dissipates energy as heat upon returning to a ground state of said inactivator.
Claim 3
Dependent Claim
34 words
A hologram recording medium according to claim 1, wherein said photopolymerizable material has a hydrophilic functional group or a functional group to form a hydrophilic group upon hydrolysis and an ethylenically unsaturated double bond.
Claim 4
Dependent Claim
34 words
A hologram recording medium according to claim 1, wherein said photopolymerizable monomer or oligomer is employed in the range of 75 to 85 volume percent and said inactivator is 25 to 15 volume percent.
Claim 5
Dependent Claim
16 words
A hologram recording medium as in claim 1, wherein said porous material is an open-celled glass.
Claim 6
Dependent Claim
18 words
A hologram recording medium as in claim 2, wherein the open pore size is less than 500 Å.
Claim 7
Dependent Claim
17 words
A hologram recording medium as in claim 1, wherein the average pore size is about 40 Å.
Claim 8
Dependent Claim
34 words
A hologram recording medium as in claim 2, wherein said polymerizable monomer is selected from the group consisting of a silane coupling agent having an ethylenically unsaturated double bond and a titanium coupling agent.
Claim 9
Dependent Claim
20 words
A hologram recording medium as in claim 7, wherein said photopolymerizable monomer has a boiling point greater than 100° C.
Claim 10
Dependent Claim
28 words
A hologram recording medium as in claim 1, wherein the photopolymerization initiator is selected from the group consisting of diacetyl benzoin, benzoin methyl ether, azoisobutyronitrile, triphenylphosphine, and benzophenone-triethylamine.
Claim 11
Dependent Claim
100 words
A hologram recording medium comprising a rigid substrate formed of transparent and non-light scattering material having a plurality of open pores in said substrate, photopolymerizable composition impregnated in said open pores, said photopolymerizable composition consisting essentially of: a photopolymerizable material selected from the group of consisting of photopolymerizable monomers or photopolymerizable oligomers having an adhesive property to surface of said open pores; a photopolymerization initiator, and an inactivator for controlling photopolymerization speed; and said inactivator is a material having a triplet interaction with the photopolymerizable initiator; wherein said inactivator is selected from the group consisting of 1-phenylnapthalene and olive oil.
Claim 12
Dependent Claim
100 words
A hologram recording medium comprising a rigid substrate formed of transparent and non-light scattering material having a plurality of open pores in said substrate, photopolymerizable composition impregnated in said open pores, said photopolymerizable composition consisting essentially of: a photopolymerizable material selected from the group of consisting of photopolymerizable monomers or photopolymerizable oligomers having an adhesive property to surface of said open pores; a photopolymerization initiator, and an inactivator for controlling photopolymerization speed; and said inactivator is a material having a triplet interaction with the photopolymerizable initiator; wherein said inactivator is selected from the group consisting of 1-phenylnapthalene and olive oil.
Claim 13
Dependent Claim
22 words
A hologram recording medium as in claim 3, wherein the initiator is between 0.5 and 2 percent weight based on the monomer.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-06-26 | 1992-12-26 | 1993-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-26 | 1996-12-26 | 1997-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-26 | 2000-12-26 | 2001-06-27 | $7700.00 | Window Closed / Lapsed |