US4821050A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical information recording medium
Assignee: Fujifilm Holdings Corp
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Filing: 1987-07-17
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Granted: 1989-04-11
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Expires: 2007-07-17
Abstract
Abstract An optical information recording medium of two disc substrates, which are adhered directly or through a convex portion formed on at least one of the substrates or a spacer provided between the substrates by an adhesive layer, and a recording layer which is capable of recording and/or reading information by laser beam and which is provided on a surface of at least one of the substrates facing the other substrate, wherein the adhesive layer is formed by an ultraviolet-curing epoxy adhesive composition comprising a light-initiator which produces a cationic polymerization initiator upon irradiation with ultraviolet rays and an epoxy compound having two or more epoxy groups per molecule.
Inventors
- 👤 Masao Yabe
- 👤 Yonosuke Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:26
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/252; G11B7/256; G11B7/253; G11B7/2531; G11B7/2533; G11B7/2534; G11B7/257; G11B7/2572; G11B7/2575; Y; Y10; Y10S; Y10S430/00; Y10S430/146
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
106 words
An optical information recording medium comprising two disc substrates, which are adhered directly or through a convex portion formed on at least one of the substrates or a spacer provided between the substrates by an adhesive layer, and a recording layer which is capable of recording and/or reading information by laser beam and which is provided on a surface of at least one of the substrates facing the other substrate, wherein the adhesive layer comprises an ultraviolet-curing epoxy adhesive composition comprising a light-initiator which produces a cationic polymerization initiator upon irradiation with ultraviolet rays and an epoxy compound having two or more epoxy groups per molecule.
Claim 2
Dependent Claim
106 words
An optical information recording medium comprising two disc substrates, which are adhered directly or through a convex portion formed on at least one of the substrates or a spacer provided between the substrates by an adhesive layer, and a recording layer which is capable of recording and/or reading information by laser beam and which is provided on a surface of at least one of the substrates facing the other substrate, wherein the adhesive layer comprises an ultraviolet-curing epoxy adhesive composition comprising a light-initiator which produces a cationic polymerization initiator upon irradiation with ultraviolet rays and an epoxy compound having two or more epoxy groups per molecule.
Claim 3
Dependent Claim
17 words
An optical information recording medium as in claim 1, wherein said light initiator is a diazonium salt.
Claim 4
Dependent Claim
17 words
An optical information recording medium as in claim 1, wherein said light initiator is an onium salt.
Claim 5
Dependent Claim
17 words
An optical information recording medium as in claim 1, wherein said light initiator is a thiopyrylium salt.
Claim 6
Dependent Claim
19 words
An optical information recording medium as in claim 1, wherein said light initiator is a hydroxybenzophenone methane sulfonate ester.
Claim 7
Dependent Claim
17 words
An optical information recording medium as in claim 1, wherein said light initiator is a diaryliodosyl salt.
Claim 8
Dependent Claim
19 words
An optical information recording medium as in claim 1, wherein said light initiator is an organic metal complex cation.
Claim 9
Dependent Claim
32 words
An optical information recording medium as in claim 1, wherein said spacers are made of a material having the same thermal expansion coefficient and humidity expansion coefficient as that of the substrates.
Claim 10
Dependent Claim
22 words
An optical information recording medium as in claim 1, wherein said recording layer has a thickness of from 150 to 1,000 Å.
Claim 11
Dependent Claim
26 words
An optical information recording medium as in claim 1, wherein a subbing layer is present between the inner surface of the substrate and the recording layer.
Claim 12
Dependent Claim
25 words
An optical information recording medium as in claim 10, wherein the subbing layer has a thickness within the range of from 0.01 to 10 μm.
Claim 13
Dependent Claim
17 words
An optical information recording medium as in claim 1, wherein said adhesive composition further comprises a sensitizer.
Claim 14
Dependent Claim
22 words
An optical information recording medium as in claim 12, wherein said sensitizer has an absorption wavelength of from 300 to 450 nm.
Claim 15
Dependent Claim
31 words
An optical information recording medium as in claim 1, wherein the weight mixing ratio of the light initiator to the epoxy compound is within the range of from 0.0001/1 to 0.1/1.
Claim 16
Dependent Claim
25 words
An optical information recording medium as in claim 12, wherein said sensitizer is selected from the group consisting of anthracene, benzophenone, pyrene, thioxanthone, and phenothiazine.
References Cited (Backward Citations)
US4434429A
Cited
US4499477A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-04-10 | 1992-10-10 | 1993-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-04-10 | 1996-10-10 | 1997-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-04-10 | 2000-10-10 | 2001-04-11 | $7700.00 | Window Closed / Lapsed |