Patent US5360652A successfully refreshed from Google Patents.
US5360652A
Expired / Lapsed
US
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Optical recording disc
Assignee: Pioneer Corp
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Filing: 1992-10-15
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Granted: 1994-11-01
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Expires: 2012-10-15
Abstract
Abstract The present invention relates to an optical recording disc comprising two disc bases each having a recording layer formed on one surface side of a substrate bonded to each other by the medium of an adhesive layer with both recording layers facing each other. The adhesive layer, containing an adhesive and a reaction initiator, is hardened through polymerization reaction by the reaction initiator and photopolymerization reaction by ultraviolet-ray irradiation. For this reason, the adhesive layers of both disc bases can be bonded together entirely and uniformly and besides, the adhesive layer can rapidly get hardened, which is advantageous for enhancing productivity of a double-face type optical recording disc.
Inventors
- 👤 Takahiro Kobayashi
- 👤 Seiro Fujii
- 👤 Satoshi Jinno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 21:43
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/26; G11B7/24018; G11B7/24024; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10S430/00; Y10S430/146
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
98 words
An optical recording disc comprising two disc bases each having a recording layer formed on one surface side of a substrate bonded to each other by the medium of an adhesive layer with the respective recording layers facing each other, wherein said adhesive layer contains an adhesive and a reaction initiator, and said adhesive layer is hardened through polymerization reaction by said reaction initiator and photopolymerization reaction by ultraviolet-ray irradiation, wherein said adhesive layer is formed of a two-liquid type adhesive prepared from an ultraviolet-ray hardenable adhesive containing photodecomposition type photosensitive resin and a reaction initiator added thereto.
Claim 2
Dependent Claim
98 words
An optical recording disc comprising two disc bases each having a recording layer formed on one surface side of a substrate bonded to each other by the medium of an adhesive layer with the respective recording layers facing each other, wherein said adhesive layer contains an adhesive and a reaction initiator, and said adhesive layer is hardened through polymerization reaction by said reaction initiator and photopolymerization reaction by ultraviolet-ray irradiation, wherein said adhesive layer is formed of a two-liquid type adhesive prepared from an ultraviolet-ray hardenable adhesive containing photodecomposition type photosensitive resin and a reaction initiator added thereto.
Claim 3
Dependent Claim
16 words
The optical recording disc according to claim 1, wherein said reaction initiator is a thioxanthone derivative.
Claim 4
Dependent Claim
99 words
An optical recording disc comprising two disc bases each having a recording layer formed on one surface side of a substrate bonded to each other by the medium of an adhesive layer with the respective recording layers facing each other, wherein said adhesive layer contains an adhesive and a reaction initiator, and said adhesive layer is hardened through polymerization reaction by said reaction initiator and photopolymerization reaction by ultraviolet-ray irradiation, wherein said adhesive layer is formed of a two-liquid type adhesive prepared from an ultra-violet-ray hardenable adhesive containing a photodimerization type photosensitive resin and a reaction initiator added thereto.
Claim 5
Dependent Claim
99 words
An optical recording disc comprising two disc bases each having a recording layer formed on one surface side of a substrate bonded to each other by the medium of an adhesive layer with the respective recording layers facing each other, wherein said adhesive layer contains an adhesive and a reaction initiator, and said adhesive layer is hardened through polymerization reaction by said reaction initiator and photopolymerization reaction by ultraviolet-ray irradiation, wherein said adhesive layer is formed of a two-liquid type adhesive prepared from an ultra-violet-ray hardenable adhesive containing a photodimerization type photosensitive resin and a reaction initiator added thereto.
Claim 6
Dependent Claim
99 words
An optical recording disc comprising two disc bases each having a recording layer formed on one surface side of a substrate bonded to each other by the medium of an adhesive layer with the respective recording layers facing each other, wherein said adhesive layer contains an adhesive and a reaction initiator, and said adhesive layer is hardened through polymerization reaction by said reaction initiator and photopolymerization reaction by ultraviolet-ray irradiation, wherein said adhesive layer is formed of a two-liquid type adhesive prepared from an ultraviolet-ray hardenable adhesive containing a photopolymerization type photosensitive resin and a reaction initiator added thereto.
Claim 7
Dependent Claim
99 words
An optical recording disc comprising two disc bases each having a recording layer formed on one surface side of a substrate bonded to each other by the medium of an adhesive layer with the respective recording layers facing each other, wherein said adhesive layer contains an adhesive and a reaction initiator, and said adhesive layer is hardened through polymerization reaction by said reaction initiator and photopolymerization reaction by ultraviolet-ray irradiation, wherein said adhesive layer is formed of a two-liquid type adhesive prepared from an ultraviolet-ray hardenable adhesive containing a photopolymerization type photosensitive resin and a reaction initiator added thereto.
Claim 8
Dependent Claim
80 words
An optical recording disc comprising two disc bases each having a recording layer formed on one surface side of a substrate bonded to each other by the medium of an adhesive layer with the respective recording layers facing each other, wherein said adhesive layer contains an adhesive and a reaction initiator, and said adhesive layer is hardened through polymerization reaction by said reaction initiator and photopolymerization reaction by ultraviolet-ray irradiation, wherein said reaction initiator is a non-cyclic monoacyl benzene derivative.
Claim 9
Dependent Claim
80 words
An optical recording disc comprising two disc bases each having a recording layer formed on one surface side of a substrate bonded to each other by the medium of an adhesive layer with the respective recording layers facing each other, wherein said adhesive layer contains an adhesive and a reaction initiator, and said adhesive layer is hardened through polymerization reaction by said reaction initiator and photopolymerization reaction by ultraviolet-ray irradiation, wherein said reaction initiator is a non-cyclic monoacyl benzene derivative.
Claim 10
Dependent Claim
80 words
An optical recording disc comprising two disc bases each having a recording layer formed on one surface side of a substrate bonded to each other by the medium of an adhesive layer with the respective recording layers facing each other, wherein said adhesive layer contains an adhesive and a reaction initiator, and said adhesive layer is hardened through polymerization reaction by said reaction initiator and photopolymerization reaction by ultraviolet-ray irradiation, wherein said reaction initiator is benzil or a benzil derivative.
Claim 11
Dependent Claim
80 words
An optical recording disc comprising two disc bases each having a recording layer formed on one surface side of a substrate bonded to each other by the medium of an adhesive layer with the respective recording layers facing each other, wherein said adhesive layer contains an adhesive and a reaction initiator, and said adhesive layer is hardened through polymerization reaction by said reaction initiator and photopolymerization reaction by ultraviolet-ray irradiation, wherein said reaction initiator is benzil or a benzil derivative.
Claim 12
Dependent Claim
18 words
The optical recording disc according to claim 3, wherein said reaction initiator is benzoin or a benzoin derivative.
Claim 13
Dependent Claim
28 words
The optical recording disc according to claim 4, wherein the additive ratio of said reaction initiator with regard to said adhesive ranges from 0.5 to 80 weight %.
Claim 14
Dependent Claim
92 words
An optical recording disc comprising two disc bases each having a recording layer formed on one surface side of a substrate bonded to each other by the medium of an adhesive layer with the respective recording layers facing each other, wherein said adhesive layer contains an adhesive and a reaction initiator, and said adhesive layer is hardened through polymerization reaction by said reaction initiator and photopolymerization reaction by ultraviolet-ray irradiation, wherein said reaction initiator initiates polymerization reaction only after said adhesive layer is partially hardened through said polymerization reaction by ultra-violet-ray irradiation.
Claim 15
Dependent Claim
92 words
An optical recording disc comprising two disc bases each having a recording layer formed on one surface side of a substrate bonded to each other by the medium of an adhesive layer with the respective recording layers facing each other, wherein said adhesive layer contains an adhesive and a reaction initiator, and said adhesive layer is hardened through polymerization reaction by said reaction initiator and photopolymerization reaction by ultraviolet-ray irradiation, wherein said reaction initiator initiates polymerization reaction only after said adhesive layer is partially hardened through said polymerization reaction by ultra-violet-ray irradiation.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1997-10-31 | 1998-05-02 | 1998-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-10-31 | 2002-05-02 | 2002-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-10-31 | 2006-05-02 | 2006-11-01 | $7700.00 | Window Closed / Lapsed |