Patent US4504548A successfully refreshed from Google Patents.
US4504548A
Expired / Lapsed
US
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Optical information recording medium for semiconductor laser
Assignee: NEC Corp
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Filing: 1983-06-23
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Granted: 1985-03-12
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Expires: 2003-06-23
Abstract
Abstract An optical recording medium is disclosed which allows information to be recorded thereinto and read thereoutof by means of semiconductor laser light. The recording medium comprises at least a substrate and a recording layer formed on one or both sides of the substrate. Information is recorded into and read from the recording layer by laser light. The recording layer comprises an organic film of a naphthoquinonoid dye corresponding to the following molecular formula or an organic film whose major component is the naphthoquinonoid dye: ##STR1## where R is a first auxochrome and R' a second auxochrome. The first auxochrome is a hydroxyl group, an amino group, or an alkyl substituted amino group, while the second auxochrome is a hydroxyl group, an amino group, an alkyl substituted amino group or ##STR2## where X' is a hydrogen atom, an alkyl group, an amino group, a substituted amino group or an alkoxyl group.
Inventors
- 👤 Sotaro Esho
- 👤 Masaki Itoh
- 👤 Masaru Matsuoka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 23:01
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/242; G11B7/244; G11B7/246; G11B7/245; G11B7/252; G11B7/253; G11B7/254; G11B7/257; G11B7/258; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10S430/00; Y10S430/146; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678; Y10T428/31971
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
80 words
In an optical information recording medium having a substrate and a recording layer formed on at least one side of the substrate to permit information to be recorded thereinto or reproduced thereoutof by laser light, said recording layer comprising at least one of an organic film constituted by a naphthoquinonoid dye corresponding to the following molecular formula and an organic film whose major component is the naphthoquinonoid dye: ##STR5## where R is a first auxochrome and R' a second auxochrome.
Claim 2
Dependent Claim
80 words
In an optical information recording medium having a substrate and a recording layer formed on at least one side of the substrate to permit information to be recorded thereinto or reproduced thereoutof by laser light, said recording layer comprising at least one of an organic film constituted by a naphthoquinonoid dye corresponding to the following molecular formula and an organic film whose major component is the naphthoquinonoid dye: ##STR5## where R is a first auxochrome and R' a second auxochrome.
Claim 3
Dependent Claim
25 words
The recording medium as claimed in claim 1, in which the substrate is selected from the group consisting of glass, synthetic resins and alminum alloys.
Claim 4
Dependent Claim
21 words
The recording medium as claimed in claim 1, in which the top of the medium is covered with a protective layer.
Claim 5
Dependent Claim
23 words
The recording medium as claimed in claim 1, in which the organic film comprises a mixture of the naphthoquinonoid dye and a metal.
Claim 6
Dependent Claim
24 words
The recording medium as claimed in claim 1, in which the organic film comprises a mixture of the naphthoquinonoid dye and a thermoplastic resin.
Claim 7
Dependent Claim
22 words
The recording medium as claimed in claim 1, in which the organic film comprises a mixture of the naphthoquinone dye and nitrocellulose.
Claim 8
Dependent Claim
26 words
The recording medium as claimed in claim 1, in which a film of a metal having a low melting point is formed on the recording layer.
Claim 9
Dependent Claim
27 words
The recording medium as claimed in claim 1, in which a reflective layer for reflecting the laser light is formed between the substrate and the recording layer.
Claim 10
Dependent Claim
30 words
The recording medium as claimed in claim 8, in which a layer showing a high reflectivity and a high absorption to the laser light is disposed on the recording layer.
Claim 11
Dependent Claim
28 words
The recording medium as claimed in claim 8, in which a layer substantially transparent for the laser light is provided between the recording layer and the reflective layer.
Claim 12
Dependent Claim
30 words
The recording medium as claimed in claim 10, in which a layer showing a high reflectivity and a high absorption to the laser light is disposed on the recording layer.
Claim 13
Dependent Claim
32 words
The recording medium as claimed in claim 1, in which the first auxochrome is selected from the group consisting of a hydroxyl group, an amino group, and an alkyl substituted amino group.
Claim 14
Dependent Claim
59 words
The recording medium as claimed in claim 12, in which the second auxochrome is selected from the group consisting of a hydroxyl group, an amino group, an alkyl substituted amino group and ##STR6## where X' is selected from the group consisting of a hydrogen atom, an alkyl group, an amino group, a substituted amino group and an alkoxyl group.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-03-11 | 1988-09-10 | 1989-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-03-11 | 1992-09-10 | 1993-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-03-11 | 1996-09-10 | 1997-03-12 | $7700.00 | Window Closed / Lapsed |