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Patent US4766047A successfully refreshed from Google Patents.
US4766047A
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Optical recording medium and optical recording process using such medium
Assignee: Canon Inc
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Filing: 1986-06-04
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Granted: 1988-08-23
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Expires: 2006-06-04
Abstract
Abstract An optical recording medium and an optical recording process using such a medium are provided. The optical recording medium comprises a photopolymerizable monomer having a hydrophilic group, a hydrophobic group, and at least one unsaturated bond in the molecule.
Inventors
- 👤 Hiroshi Matsuda
- 👤 Masahiro Haruta
- 👤 Hirohide Munakata
- 👤 Yoshinori Tomita
- 👤 Takashi Hamamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:24
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/242; G11B7/244; G03; G03F; G03F7/00; G03F7/004; G03F7/025; G03F7/027; G11B7/245; Y; Y10; Y10S; Y10S430/00; Y10S430/167; Y10S430/168
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
91 words
An optical recording process which comprises, in sequence, the steps of: (a) irradiating a recording medium having a recording layer comprising a monomolecular Langmuir-Blodgett film or a built-up monomolecular Langmuir-Blodgett film of a photopolymerizable monomer having a hydrophilic group, a hydrophobic group and at least one unsaturated bond in the molecule with information signals sufficient to polymerize the irradiated portion of the photopolymerizable monomer, thus forming recorded information corresponding to the polymerized portion of the monomer; and (b) erasing the recorded information by depolymerization of the polymerized portions of the monomer.
Claim 2
Dependent Claim
91 words
An optical recording process which comprises, in sequence, the steps of: (a) irradiating a recording medium having a recording layer comprising a monomolecular Langmuir-Blodgett film or a built-up monomolecular Langmuir-Blodgett film of a photopolymerizable monomer having a hydrophilic group, a hydrophobic group and at least one unsaturated bond in the molecule with information signals sufficient to polymerize the irradiated portion of the photopolymerizable monomer, thus forming recorded information corresponding to the polymerized portion of the monomer; and (b) erasing the recorded information by depolymerization of the polymerized portions of the monomer.
Claim 3
Dependent Claim
66 words
The optical recording process of claim 1, wherein the photopolymerizable monomer is represented by the general formula R.sub.1 --CH═CH--R.sub.2 wherein R 1 and R 2 are each a hydrophilic moiety or a hydrophobic moiety, provided that when both R 1 and R 2 have hydrophilic or hydrophobic moieties, at least one of R 1 and R 2 has both a hydrophobic group and a hydrophilic group.
Claim 4
Dependent Claim
67 words
The optical recording process of claim 1, wherein the polymerizable monomer is represented by the general formula R.sub.1 --CH═CH--R.sub.2 --CH═CH--R.sub.1 wherein R 1 and R 2 are each a hydrophilic moiety or a hydrophobic moiety, provided that when both R 1 and R 2 have hydrophilic or hydrophobic moieties, at least one of R 1 and R 2 has both a hydrophobic group and a hydrophilic group.
Claim 5
Dependent Claim
29 words
The optical recording process of claim 1, wherein the photopolymerizable monomer has at least one unsaturated bond and at least one C 10 -C 30 long chain alkyl group.
Claim 6
Dependent Claim
20 words
The optical recording process of claim 1, wherein said recording layer is irradiated with gamma rays, X-rays, or ultraviolet rays.
Claim 7
Dependent Claim
14 words
The optical recording process of claim 1, wherein said depolymerization is caused by heating.
Claim 8
Dependent Claim
26 words
The optical recording process according to claim 6, wherein said layer is heated to a depolymerization temperature within a range from 300° C. to 450° C.
Claim 9
Dependent Claim
21 words
The optical recording process according to claim 1, including the step of reading out the recorded information by visible ray irradiation.
Claim 10
Dependent Claim
37 words
The optical recording process according to claim 1, including the step of reading out the recorded information by detecting the volume change between the non-polymerized portions and the polymerized portions of the monomer employing the Schlieren technique.
Claim 11
Dependent Claim
36 words
The optical recording process according to claim 1, including the step of reading out the recorded information by electrically detecting the difference in light absorption between the non-polymerized portions and the polymerized portions of the monomer.
References Cited (Backward Citations)
US3723121A
Cited
DE2221378A1
Cited
US4235958A
Cited
EP0077577A2
Cited
US4374077A
Cited
US4314021A
Cited
US4539061A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-08-23 | 1992-02-22 | 1992-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-23 | 1996-02-22 | 1996-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-23 | 2000-02-22 | 2000-08-23 | $7700.00 | Window Closed / Lapsed |