US5219708A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical disk
Assignee: TDK Corp
•
Filing: 1991-12-04
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Granted: 1993-06-15
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Expires: 2011-12-04
Abstract
Abstract An optical disk is configured as comprising a pair of substrates one of which has a recording layer borne thereon, the substrates being joined together through an adhesive so that the recording layer is interposed therebetween. In one form, one of the substrates is of glass, the other substrate is of a resin. In another form, both the substrates are of glass or resin. Delamination is prevented by using the adhesive having a specific glass transition temperature, Young's modulus, and dynamic loss factor.
Inventors
- 👤 Hideki Hirata
- 👤 Keiji Koga
- 👤 Toshihiko Ishida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:24
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/24018; G11B7/24024; G11B7/241; G11B7/252; G11B7/253; G11B7/257; Y; Y10; Y10S; Y10S430/00; Y10S430/146
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
87 words
An optical disk comprising a pair of substrates and information carrying means on at least one of the substrates, said pair of substrates being integrated through an adhesive so as to enclose the information carrying means therebetween, wherein one of said substrates is formed of glass, the other substrate is formed of a resin, and said adhesive has a glass transition temperature Tg of from -60° C. to -10° C. and a Young's modulus of from 0.005 to 0.1 kgf/mm 2 at 20° C. and 10 Hz.
Claim 2
Dependent Claim
87 words
An optical disk comprising a pair of substrates and information carrying means on at least one of the substrates, said pair of substrates being integrated through an adhesive so as to enclose the information carrying means therebetween, wherein one of said substrates is formed of glass, the other substrate is formed of a resin, and said adhesive has a glass transition temperature Tg of from -60° C. to -10° C. and a Young's modulus of from 0.005 to 0.1 kgf/mm 2 at 20° C. and 10 Hz.
Claim 3
Dependent Claim
27 words
The optical disk of claim 1 wherein said information carrying means is on the one substrate of glass which is integrated with the protective substrate of resin.
Claim 4
Dependent Claim
17 words
The optical disk of claim 1 or 2 wherein said information carrying means includes a recording layer.
Claim 5
Dependent Claim
29 words
The optical disk of claim 3 wherein said recording layer contains a rare earth metal and which further comprises a protective coating of a resin on said recording layer.
Claim 6
Dependent Claim
25 words
The optical disk of claim 1 wherein said adhesive has a Young's modulus of up to 100 kgf/mm 2 at -20° C. and 10 Hz.
Claim 7
Dependent Claim
25 words
The optical disk of claim 1 wherein said adhesive has a dynamic loss factor tanδ of at least 0.1 at -20° C. and 10 Hz.
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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) | 1996-06-14 | 1996-12-14 | 1997-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-06-14 | 2000-12-14 | 2001-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-06-14 | 2004-12-14 | 2005-06-15 | $7700.00 | Window Closed / Lapsed |