US4870429A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical foam-spacer disk assembly
Assignee: SUNITOMO CHEMICAL COMPANY Ltd 15 KITAHAMA-5-CHOME HIGASHI-KU OSAKA JAPAN A CORP OF JAPAN
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Filing: 1987-03-02
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Granted: 1989-09-26
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Expires: 2007-03-02
Abstract
Abstract An optical disk is provided which comprises two sheets of substrates; or two sheets of substrate and a reinforcing plate or a reinforcing rim; or one sheet of substrate and a reinforcing plate; which are bonded to form an integrated body having a spacer interposed therebetween, said spacer being made of elastomeric foam having a specific gravity of not more than 1.5 and an expansion ratio of not less than 1.5 as the material of the said spacer. This optical disk has a high adaptability of the drive and exhibits a high reliability, i.e. excellent vibration restricting performance, thereby being possible to provide a stable and highly accurate information processing.
Inventors
- 👤 Tsutomu Fujita
- 👤 Yoshiaki Togawa
- 👤 Seimei Yasui
- 👤 Toshitsugu Kikuchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:11
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10S430/00; Y10S430/146
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
78 words
An optical disk comprising an assembly of two sheets of substrate which are bonded to form an integrated body having a spacer interposed therebetween, said spacer being made of an elastomeric foam material having a specific gravity of not more than 1.5 and an expansion ratio of 1.5 to 15, the elastomer of the foam material having a glass transition temperature of not more than 30° C and a reversible elastic region of strain of 1 to 2000%.
Claim 2
Dependent Claim
78 words
An optical disk comprising an assembly of two sheets of substrate which are bonded to form an integrated body having a spacer interposed therebetween, said spacer being made of an elastomeric foam material having a specific gravity of not more than 1.5 and an expansion ratio of 1.5 to 15, the elastomer of the foam material having a glass transition temperature of not more than 30° C and a reversible elastic region of strain of 1 to 2000%.
Claim 3
Dependent Claim
32 words
An optical disk according to claim 1, wherein said elastomer has a glass transition temperature of not more than 0° C and a reversible elastic region of strain of 100 to 1000%.
Claim 4
Dependent Claim
23 words
An optical disk according to claim 2, wherein said spacers are disposed at the inner and outer periphery parts of the optical disk.
Claim 5
Dependent Claim
20 words
An optical disk according to claim 1, wherein said elastomeric foam material has an expansion ratio of 3 to 10.
Claim 6
Dependent Claim
23 words
An optical disk according to claim 4, wherein said spacers are disposed at the inner and outer periphery parts of the optical disk.
Claim 7
Dependent Claim
23 words
An optical disk according to claim 1, wherein said spacers are disposed at the inner and outer periphery parts of the optical disk.
Claim 8
Dependent Claim
14 words
An optical disk of claim 1, wherein the assembly further comprises a reinforcing plate.
Claim 9
Dependent Claim
14 words
An optical disk of claim 1, wherein the assembly further comprises a reinforcing rim.
Claim 10
Dependent Claim
82 words
An optical disk comprising an assembly of one sheet of substrate and a reinforcing plate, which are bonded to form an integrated body having a spacer interposed therebetween, said spacer being made of an elastomeric foam material having a specific gravity of not more than 1.5 and an expansion ratio of 1.5 to 15, the elastomer of the foam material having a glass transition temperature of not more than 30° C and a reversible elastic region of strain of 1 to 2000%.
Claim 11
Dependent Claim
82 words
An optical disk comprising an assembly of one sheet of substrate and a reinforcing plate, which are bonded to form an integrated body having a spacer interposed therebetween, said spacer being made of an elastomeric foam material having a specific gravity of not more than 1.5 and an expansion ratio of 1.5 to 15, the elastomer of the foam material having a glass transition temperature of not more than 30° C and a reversible elastic region of strain of 1 to 2000%.
Claim 12
Dependent Claim
32 words
An optical disk according to claim 9, wherein said elastomer has a glass transition temperature of not more than 0° C and a reversible elastic region of strain of 100 to 1,000%.
Claim 13
Dependent Claim
20 words
An optical disk according to claim 9, wherein said elastomeric foam material has an expansion ratio of 3 to 10.
Claim 14
Dependent Claim
23 words
An optical disk according to claim 9, wherein said spacers are disposed at the inner and outer periphery parts of the optical disk.
Claim 15
Dependent Claim
23 words
An optical disk according to claim 10, wherein said spacers are disposed at the inner and outer periphery parts of the optical spacer.
Claim 16
Dependent Claim
23 words
An optical disk according to claim 11, wherein said spacers are disposed at the inner and outer periphery parts of the optical disks.
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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) | 1992-09-25 | 1993-03-27 | 1993-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-25 | 1997-03-27 | 1997-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-25 | 2001-03-27 | 2001-09-26 | $7700.00 | Window Closed / Lapsed |