US4465767A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical information recording medium
Assignee: Ricoh Co Ltd
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Filing: 1982-09-27
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Granted: 1984-08-14
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Expires: 2002-09-27
Abstract
Abstract An optical information recording medium comprising a substrate and a recording layer superimposed on said substrate, said recording layer being comprised of a reflective layer which contains metal particles having a particle diameter of 1500 Å or less and in which said metal particles have been distributed closely and a light absorptive layer containing a coloring matter.
Inventors
- 👤 Hideaki Oba
- 👤 Masaakira Umehara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:03
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/242; G11B7/244; G11B7/246; G11B7/252; G11B7/258; G11B7/259; G11B7/245; G11B7/2467; G11B7/247; G11B7/2472; G11B7/248; G11B7/251; G11B7/253; G11B7/2531; G11B7/2533; G11B7/257; Y; Y10; Y10S; Y10S430/00; Y10S430/143; Y10S430/146
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
136 words
An optical information recording medium comprising a substrate which is transparent to a high density energy beam and a recording layer superimposed on said substrate, said recording layer consisting of a reflective layer located on the side of said recording layer that is closest to said substrate and a light absorptive layer formed on said reflective layer and located on the side of said recording layer that is remote from said substrate, said reflective layer containing closely distributed therein metal particles having a particle diameter of 1500 Angstroms or less and wherein said metal particles occupy from 60 to 98% of the area of the surface of said reflective layer, said light absorptive layer containing a dye or oil-soluble color capable of absorbing radiation of the wavelength range used to record information on the recording medium.
Claim 2
Dependent Claim
136 words
An optical information recording medium comprising a substrate which is transparent to a high density energy beam and a recording layer superimposed on said substrate, said recording layer consisting of a reflective layer located on the side of said recording layer that is closest to said substrate and a light absorptive layer formed on said reflective layer and located on the side of said recording layer that is remote from said substrate, said reflective layer containing closely distributed therein metal particles having a particle diameter of 1500 Angstroms or less and wherein said metal particles occupy from 60 to 98% of the area of the surface of said reflective layer, said light absorptive layer containing a dye or oil-soluble color capable of absorbing radiation of the wavelength range used to record information on the recording medium.
Claim 3
Dependent Claim
16 words
A recording medium according to claim 1 wherein said substrate is composed of polysulfone or polyimide.
Claim 4
Dependent Claim
17 words
A recording medium according to claim 1 wherein said reflective layer contains a dye or oil-soluble color.
Claim 5
Dependent Claim
48 words
A recording medium according to claim 1 wherein between said reflective layer and said substrate is interposed an undercoat that is capable of permeating a high density energy beam, does not react with the reflective layer, is superior in film forming ability and is of reduced thermal conductivity.
Claim 6
Dependent Claim
101 words
An optical information recording medium comprising a substrate and a recording layer superimposed on said substrate, said recording layer consisting of a pair of reflective layers and a light absorptive layer disposed between said reflective layers, said reflective layers each containing closely distributed therein metal particles having a particle diameter of 1500 Angstroms or less and wherein said metal particles occupy from 60 to 98% of the area of the surface of said reflective layers, said light absorptive layer containing a dye or oil-soluble color capable of absorbing radiation of the wavelength range used to record information on said recording medium.
Claim 7
Dependent Claim
101 words
An optical information recording medium comprising a substrate and a recording layer superimposed on said substrate, said recording layer consisting of a pair of reflective layers and a light absorptive layer disposed between said reflective layers, said reflective layers each containing closely distributed therein metal particles having a particle diameter of 1500 Angstroms or less and wherein said metal particles occupy from 60 to 98% of the area of the surface of said reflective layers, said light absorptive layer containing a dye or oil-soluble color capable of absorbing radiation of the wavelength range used to record information on said recording medium.
Claim 8
Dependent Claim
31 words
A recording medium according to claim 5 wherein an overcoat is further superimposed on said reflective layer located on the side of said recording layer that is remote from said substrate.
Claim 9
Dependent Claim
33 words
A recording medium according to claim 5 wherein an undercoat is interposed between said substrate and said reflective layer located on the side of said recording layer that is closest to said substrate.
Claim 10
Dependent Claim
57 words
A recording medium according to claim 1 in which said light absorptive layer consists of a first light absorptive sub-layer located adjacent to said reflective layer and a second light absorptive sub-layer formed on said first light absorptive sub-layer and located remote from said reflective layer, said second light absorptive sub-layer containing said dye or oil-soluble color.
Claim 11
Dependent Claim
102 words
A recording medium according to claim 8 in which said first light absorptive sub-layer consists essentially of a binder resin containing particles of metal compound and a very small amount of metal substantially uniformly dispersed therein, said particles of metal compound and metal in said first light absorptive sub-layer having a particle size in the range of from 200 to 2000 Angstroms, the sum of the amounts of said particles of metal compound and metal in said first light absorptive sub-layer being in the range of from 1 to 30 volume %, based on the volume of said first light absorptive sub-layer.
Claim 12
Dependent Claim
17 words
A recording medium according to claim 8 wherein said reflective layer contains a dye or oil-soluble color.
Claim 13
Dependent Claim
49 words
A recording medium according to claim 8 wherein between said reflective layer and said said substrate is interposed an undercoat that is capable of permeating a high density energy beam, does not react with the reflective layer, is superior in film forming ability and is of reduced thermal conductivity.
Claim 14
Dependent Claim
17 words
A recording medium according to claim 1 wherein said reflective layer consists of said metal particles alone.
Claim 15
Dependent Claim
19 words
A recording medium according to claim 1 wherein the light absorptive layer consists of a dye or oil-soluble color.
Claim 16
Dependent Claim
25 words
A recording medium according to claim 1 wherein the light reflectance of said reflective layer to near infrared radiation is in the range of 15-75%.
Claim 17
Dependent Claim
24 words
A recording medium according to claim 1 wherein the light permeability of said light absorptive layer to near infrared radiation is 10% or less.
Claim 18
Dependent Claim
21 words
A recording medium according to claim 8 in which said second light absorptive sub-layer consists of a dye or oil-soluble color.
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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) | 1987-08-14 | 1988-02-13 | 1988-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-08-14 | 1992-02-13 | 1992-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-08-14 | 1996-02-13 | 1996-08-14 | $7700.00 | Window Closed / Lapsed |