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US4432002A
Expired / Lapsed
US
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Data recording medium and manufacturing method therefor
Assignee: Toshiba Corp
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Filing: 1981-10-06
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Granted: 1984-02-14
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Expires: 2001-10-06
Abstract
Abstract A data recording medium comprises two disc-shaped substrates opposing each other at a distance; a pair of radiation-sensitive recording layers, each of which is formed on part of an opposing surface of each of the substrates and which oppose each other at a distance; and an interlayer with a low reflectivity which fills a space defined by the recording layers and which is bonded to the recording layers. Optical data may be recorded on a record or read out from the record by focusing a laser beam on the recording layers.
Inventors
- 👤 Hideo Ando
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:37
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/24018; G11B7/24021
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
97 words
A data recording medium comprising: two disc-shaped substrates of 0.3 millimeter to 5 millimeter in thickness opposing each other at a distance; a pair of radiation-sensitive recording layers, each of which is formed on part of an opposing surface of each of said substrates and which oppose each other at a distance; and an interlayer with a low reflectivity which fills a space defined between said recording layers and the space defined between parts of said substrates not covered by said recording layer so that said interlayer is bonded to said recording layers and to said substrates.
Claim 2
Dependent Claim
97 words
A data recording medium comprising: two disc-shaped substrates of 0.3 millimeter to 5 millimeter in thickness opposing each other at a distance; a pair of radiation-sensitive recording layers, each of which is formed on part of an opposing surface of each of said substrates and which oppose each other at a distance; and an interlayer with a low reflectivity which fills a space defined between said recording layers and the space defined between parts of said substrates not covered by said recording layer so that said interlayer is bonded to said recording layers and to said substrates.
Claim 3
Dependent Claim
15 words
A data recording medium according to claim 1, wherein said interlayer comprises an eposy resin.
Claim 4
Dependent Claim
15 words
A data recording medium according to claim 1, wherein said interlayer comprises a polystyrene resin.
Claim 5
Independent Claim
100 words
A method for manufacturing a data recording medium comprising the steps of: forming two disc-shaped substrates of 0.3 millimeter to 5 millimeter in thickness each having a radiation-sensitive recording layer on part of a surface thereof; forming on each of said recording layers and on surfaces of said substrates not covered by said recording layers an interlayer with a low reflectivity and a high adhesion strength which is of sufficient thickness to bury said recording layers on the surface of each of said substrates; and opposing said interlayers in contact with each other and bonding said interlayers to each other.
Claim 6
Independent Claim
100 words
A method for manufacturing a data recording medium comprising the steps of: forming two disc-shaped substrates of 0.3 millimeter to 5 millimeter in thickness each having a radiation-sensitive recording layer on part of a surface thereof; forming on each of said recording layers and on surfaces of said substrates not covered by said recording layers an interlayer with a low reflectivity and a high adhesion strength which is of sufficient thickness to bury said recording layers on the surface of each of said substrates; and opposing said interlayers in contact with each other and bonding said interlayers to each other.
Claim 7
Dependent Claim
33 words
A method according to claim 4, wherein an adhesive is coated on the surfaces of said interlayers after said interlayers are cured and not adherable, and said interlayers are bonded through the adhesive.
Claim 8
Dependent Claim
23 words
A method according to claim 4 or 5, wherein said substrates are clamped from the outside by press plates when bonding said interlayers.
References Cited (Backward Citations)
US3665483A
Cited
US4264911A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-02-13 | 1987-08-15 | 1988-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-13 | 1991-08-15 | 1992-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-13 | 1995-08-15 | 1996-02-14 | $7700.00 | Window Closed / Lapsed |