US5708652A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-layer recording medium and method for producing same
Assignee: Sony Corp
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Filing: 1996-02-27
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Granted: 1998-01-13
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Expires: 2016-02-27
Abstract
Abstract A multi-layer recording medium including a light-transmitting substrate, a first information recording layer formed on the substrate, an intermediate layer at least part of which is formed of a photo-curable resin film, and which is formed on the first information recording layer, a second information recording layer formed on a surface of the intermediate layer opposite to the surface facing the first information signal layer, and a protective layer formed on the second information signal layer. A method for producing such multi-layer recording medium is also disclosed.
Inventors
- 👤 Hiroshi Ohki
- 👤 Toshiyuki Kashiwagi
- 👤 Motohiro Furuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:28
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/26; B; B29; B29D; B29D17/00; B29D17/005; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1039; Y10T156/1041
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
78 words
A multi-layer recording medium, comprising: a light-transmitting substrate; a first information recording layer formed on said substrate; an intermediate layer at least part of which is formed of a dry photo-curable resin film, and which is formed on said first information recording layer; a second information recording layer formed on a surface of said intermediate layer opposite to the surface thereof facing said first information signal layer; and a protective layer formed on said second information signal layer.
Claim 2
Dependent Claim
78 words
A multi-layer recording medium, comprising: a light-transmitting substrate; a first information recording layer formed on said substrate; an intermediate layer at least part of which is formed of a dry photo-curable resin film, and which is formed on said first information recording layer; a second information recording layer formed on a surface of said intermediate layer opposite to the surface thereof facing said first information signal layer; and a protective layer formed on said second information signal layer.
Claim 3
Dependent Claim
32 words
The multi-layer recording medium as claimed in claim 1, wherein said first information recording layer has a pattern of micro-sized lands and recesses which is buried in said dry photo-curable resin film.
Claim 4
Dependent Claim
54 words
The multi-layer recording medium as claimed in claim 1, wherein said intermediate film is formed only by the dry photo-curable resin film and wherein a pattern of micro-sized lands and recesses constituting the second information recording layer is formed on a surface of dry said photo-curable resin film opposite to said information recording layer.
Claim 5
Dependent Claim
48 words
The multi-layer recording medium as claimed in claim 1, wherein said intermediate film is formed by the dry photo-curable resin film and a liquid photo-curable resin layer provided on the side of the first information recording layer and on the side of the second information recording layer, respectively.
Claim 6
Dependent Claim
31 words
The multi-layer recording medium as claimed in claim 4, wherein the pattern of micro-sized lands and recesses constituting the second information recording layer is formed on said liquid photo-curable resin layer.
Claim 7
Dependent Claim
39 words
The multi-layer recording medium as claimed in claim 1, wherein said multi-layer recording medium is a double-layer optical disc wherein said first and second information recording layers function as an information signal recording region and carry rows of pits.
Claim 8
Dependent Claim
35 words
The multi-layer recording medium as claimed in claim 1, wherein said light-transmitting substrate comprises a transparent synthetic resin on the major surface of which the first information recording layer is formed by rows of pits.
Claim 9
Dependent Claim
27 words
The multi-layer recording medium as claimed in claim 6, further including a thin semi-transparent reflecting film of a dielectric material formed on the first information recording layer.
Claim 10
Dependent Claim
31 words
The multi-layer recording medium as claimed in claim 1, wherein the intermediate layer has a thickness of about 40 micrometers and said dry photo-curable resin film is a film-forming dry photopolymer.
Claim 11
Dependent Claim
33 words
The multi-layer recording medium as claimed in claim 8, wherein said intermediate layer is of a uniform thickness from the outset and is formed by pressure bonding the film-forming dry photopolymer in situ.
Claim 12
Dependent Claim
128 words
A multi-layer recording medium, comprising: a substrate of a transparent synthetic resin material; a first information recording layer formed by rows of pits on the major surface of said substrate; a thin semi-transparent reflecting film of a dielectric material formed on the first information recording layer; an intermediate layer having, on its surface opposite to the semi-transparent reflecting film, a second information recording layer by rows of pits; and a protective layer on said reflecting film, wherein said intermediate layer is a transparent photo-curable resin film formed of a film-forming dry photopolymer having a uniform thickness from the outset without requiring spin-coating a plurality of layers to reach said uniform thickness or dripping resin into a spacer, and formed by pressure bonding the film-forming dry photopolymer in situ.
Claim 13
Dependent Claim
128 words
A multi-layer recording medium, comprising: a substrate of a transparent synthetic resin material; a first information recording layer formed by rows of pits on the major surface of said substrate; a thin semi-transparent reflecting film of a dielectric material formed on the first information recording layer; an intermediate layer having, on its surface opposite to the semi-transparent reflecting film, a second information recording layer by rows of pits; and a protective layer on said reflecting film, wherein said intermediate layer is a transparent photo-curable resin film formed of a film-forming dry photopolymer having a uniform thickness from the outset without requiring spin-coating a plurality of layers to reach said uniform thickness or dripping resin into a spacer, and formed by pressure bonding the film-forming dry photopolymer in situ.
Claim 14
Dependent Claim
18 words
The multi-layer recording medium as set form in claim 11 wherein said uniform thickness is about 40 micrometers.
Claim 15
Dependent Claim
43 words
The multi-layer recording medium as set forth in claim 11, wherein the multi-layer recording medium is a double-layer optical disc wherein said first and said second information recording layers function as an information signal recording region, and said substrate is a disc substrate.
Claim 16
Dependent Claim
31 words
The multi-layer recording medium as claimed in claim 11, wherein said first information recording layer has a pattern of micro-sized lands and recesses which is buried in said photo-curable resin film.
Claim 17
Dependent Claim
52 words
The multi-layer recording medium as claimed in claim 11, wherein said intermediate film is formed only by dry photo-curable resin film and wherein a pattern of micro-sized lands and recesses constituting the second information recording layer is formed on a surface of said photo-curable resin film opposite to said information recording layer.
Claim 18
Dependent Claim
47 words
The multi-layer recording medium as claimed in claim 11, wherein said intermediate film is formed by a photo-curable resin film and dry liquid photo-curable resin layer provided on the side of the first information recording layer and on the side of the second information recording layer, respectively.
Claim 19
Dependent Claim
31 words
The multi-layer recording medium as claimed in claim 16, wherein the pattern of micro-sized lands and recesses constituting the second information recording layer is formed on said liquid photo-curable resin layer.
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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) | 2001-01-12 | 2001-07-14 | 2002-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-01-12 | 2005-07-14 | 2006-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-01-12 | 2009-07-14 | 2010-01-13 | $7700.00 | Window Closed / Lapsed |