US4477555A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical information recording medium
Assignee: Ricoh Co Ltd
•
Filing: 1982-07-28
•
Granted: 1984-10-16
•
Expires: 2002-07-28
Abstract
Abstract An optical information recording medium comprising a substrate and a recording layer superimposed on said substrate, said recording layer comprising a reflective layer in which metal particles with a particle diameter of 1500Å or less have been distributed closely and a light absorptive layer in which metal compounds and a very small amount of metal particles with a particle diameter of 200-2000Å have been dispersed unformly or substantially uniformly in the volume ratio of 1-30% in a resin.
Inventors
- 👤 Hideaki Oba
- 👤 Makoto Kunikane
- 👤 Masaakira Umehara
- 👤 Kiyoshi Tanikawa
- 👤 Michiharu Abe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:56
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/242; G11B7/244; G11B7/245; G11B7/251; G11B7/252; G11B7/253; G11B7/2531; G11B7/2533; G11B7/256; G11B7/258; Y; Y10; Y10S; Y10S430/00; Y10S430/143; Y10S430/146
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
160 words
An optical information recording medium comprising a substrate and a recording layer superimposed on said substrate, said recording layer consisting of a reflective sub-layer and a light absorptive sub-layer formed on said reflective sub-layer, said reflective sub-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 sub-layer, said light absorptive sub-layer being made of a 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 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 light absorptive sub-layer being in the range of from 1 to 30 volume %, based on the volume of said light absorptive sub-layer.
Claim 2
Dependent Claim
160 words
An optical information recording medium comprising a substrate and a recording layer superimposed on said substrate, said recording layer consisting of a reflective sub-layer and a light absorptive sub-layer formed on said reflective sub-layer, said reflective sub-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 sub-layer, said light absorptive sub-layer being made of a 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 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 light absorptive sub-layer being in the range of from 1 to 30 volume %, based on the volume of said light absorptive sub-layer.
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
46 words
A recording medium according to claim 1 wherein said reflective sub-layer is located on the side of said recording layer that is remote from said substrate and said light absorptive sub-layer is located on the side of said recording layer that is closest to said substrate.
Claim 5
Dependent Claim
46 words
A recording medium according to claim 3 wherein on said reflective sub-layer is further superimposed an overcoat that is capable of permeating a high density energy beam, is superior in mechanical strength, does not react with the reflective sub-layer and is of a superior film formability.
Claim 6
Dependent Claim
20 words
A recording medium according to claim 3 wherein an undercoat is interposed between said light absorptive sub-layer and said substrate.
Claim 7
Dependent Claim
46 words
A recording medium according to claim 1 wherein said reflective sub-layer is located on the side of said recording layer that is closest to said substrate and said light absorptive sub-layer is located on the side of said recording layer that is remote from said substrate.
Claim 8
Dependent Claim
48 words
A recording medium according to claim 6 wherein between said reflective sub-layer and said substrate is interposed an undercoat that is capable of permeating a high density energy beam, does not react with the reflective sub-layer, is superior in the film formablility and is of reduced thermal conductivity.
Claim 9
Dependent Claim
31 words
A recording medium according to claim 1 wherein an overcoat is further superimposed on said reflective sub-layer located on the side of said recording layer that is remote from said substrate.
Claim 10
Dependent Claim
33 words
A recording medium according to claim 1 wherein an undercoat is interposed between said substrate and said reflective sub-layer located on the side of said recording layer that is closest to said substrate.
Claim 11
Dependent Claim
37 words
A recording medium according to claim 1 in which said metal particles in said reflective sub-layer have particle diameters in the range of 150 to 1500 Angstroms and the average particle size thereof is about 500 Angstroms.
Claim 12
Dependent Claim
163 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 sub-layers and a light absorptive sub-layer disposed between said reflective sub-layers, said reflective sub-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 90% of the area of the surface of said reflective sub-layers, said light absorptive sub-layer being made of a 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 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 light absorptive sub-layer being in the range of from 1 to 30 volume %, based on the volume of said light absorptive sub-layer.
Claim 13
Dependent Claim
163 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 sub-layers and a light absorptive sub-layer disposed between said reflective sub-layers, said reflective sub-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 90% of the area of the surface of said reflective sub-layers, said light absorptive sub-layer being made of a 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 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 light absorptive sub-layer being in the range of from 1 to 30 volume %, based on the volume of said light absorptive sub-layer.
Claim 14
Dependent Claim
37 words
A recording medium according to claim 11 in which said metal particles in said reflective sub-layer have particle diameters in the range of 150 to 1500 Angstroms and the average particle size thereof is about 500 Angstroms.
Claim 15
Dependent Claim
66 words
A recording medium according to claim 1 in which said metal particles occupy from 70 to 90% of the area of the surface of said reflective sub-layer, and the sum of the amounts of said particles of metal compound and metal in said light absorptive sub-layer is in the range of from 2 to 10 volume %, based on the volume of said light absorptive sub-layer.
References Cited (Backward Citations)
US3962513A
Cited
US4188214A
Cited
US4305081A
Cited
US4230939A
Cited
US4241355A
Cited
US4218689A
Cited
US4364986A
Cited
US4373004A
Cited
US4252677A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-10-16 | 1988-04-16 | 1988-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-16 | 1992-04-16 | 1992-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-16 | 1996-04-16 | 1996-10-16 | $7700.00 | Window Closed / Lapsed |