US5075147A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for optically recording information and information recorded medium
Assignee: Fujifilm Holdings Corp
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Filing: 1990-03-23
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Granted: 1991-12-24
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Expires: 2010-03-23
Abstract
Abstract A method of optically recording information on an information recording medium comprising a disc-shaped substrate having a pregroove comprising a groove having a depth of 800 to 2,000 angstroms and a half width of 0.2 to 0.7 μm thereon, a recording layer comprising a dye for optically recording information by means of a laser beam which is provided on the substrate, and a reflecting layer of a metal which is provided on the recording layer is disclosed. The recording method is carried out by irradiating a bottom part of the pregroove having the recording layer thereon with a laser beam from the substrate side under rotation of the recording medium. Further, an information recorded medium which is recorded with information by the above method is also disclosed.
Inventors
- 👤 Yoshihisa Usami
- 👤 Yoshio Inagaki
- 👤 Masao Yabe
- 👤 Mitsuru Sawano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:44
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/004; G11B7/0045; G11B7/00451; G11B7/00452; G11B7/24; G11B7/2407; G11B7/24073; G11B7/24079; G11B7/241; G11B7/242; G11B7/244; G11B7/246; G11B7/247; G11B7/2472; G11B7/248; G11B7/252; G11B7/258; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10S430/00; Y10S430/146; Y10T; Y10T428/00; Y10T428/23; Y10T428/239; Y10T428/31504; Y10T428/31507; Y10T428/31678
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
105 words
A method of optically recording information on an information recording medium comprising a disc-shaped substrate, a recording layer comprising a dye for optically recording information by means of laser beam which is provided on the substrate, and a reflecting layer of a metal which is provided on the recording layer, the surface of said substrate being provided with a pregroove having a depth of 800 to 2,000 angstroms and a half width of 0.2 to 0.7 μm, which comprises irradiating a bottom part of the pregroove having the recording layer thereon with a laser beam from a substrate side under rotation of the recording medium.
Claim 2
Independent Claim
105 words
A method of optically recording information on an information recording medium comprising a disc-shaped substrate, a recording layer comprising a dye for optically recording information by means of laser beam which is provided on the substrate, and a reflecting layer of a metal which is provided on the recording layer, the surface of said substrate being provided with a pregroove having a depth of 800 to 2,000 angstroms and a half width of 0.2 to 0.7 μm, which comprises irradiating a bottom part of the pregroove having the recording layer thereon with a laser beam from a substrate side under rotation of the recording medium.
Claim 3
Dependent Claim
18 words
The method as claimed in claim 1, wherein said pregroove has a depth of 800 to 1,800 angstroms.
Claim 4
Dependent Claim
18 words
The method as claimed in claim 1, wherein said pregroove has a depth of 1,000 to 1,500 angstroms.
Claim 5
Dependent Claim
19 words
The method as claimed in claim 1, wherein said pregroove has a half width of 0.4 to 0.7 μm.
Claim 6
Dependent Claim
21 words
The method as claimed in claim 1, wherein said rotation is made at a predetermined rate of 1.2 to 2.8 m/sec.
Claim 7
Dependent Claim
21 words
The method as claimed in claim 1, wherein said rotation is made at a predetermined rate of 1.2 to 1.4 m/sec.
Claim 8
Dependent Claim
22 words
The method as claimed in claim 1, wherein said information to be recorded is composed of EFM signals according to CD format.
Claim 9
Dependent Claim
34 words
The method as claimed in claim 1, wherein said information is recorded by forming a cavity between the recording layer and the reflecting layer through the irradiation of a laser beam on the pregroove.
Claim 10
Dependent Claim
47 words
The method as claimed in claim 1, wherein said information is recorded by forming a cavity between the recording layer and the reflecting layer and rise of the surface on the recording layer side of the substrate through the irradiation of a laser beam on the pregroove.
Claim 11
Dependent Claim
87 words
An information recorded medium comprising a disc-shaped substrate, a recording layer comprising a dye for optically recording information by means of a laser beam which is provided on the substrate, and a reflecting layer of metal which is provided on the recording layer, the surface of said substrate being provided with a pregroove having a depth of 800 to 2,000 angstroms and a half width of 0.2 to 0.7 μm, which is recorded with information on a bottom part of the pregroove having the recording layer thereon.
Claim 12
Dependent Claim
87 words
An information recorded medium comprising a disc-shaped substrate, a recording layer comprising a dye for optically recording information by means of a laser beam which is provided on the substrate, and a reflecting layer of metal which is provided on the recording layer, the surface of said substrate being provided with a pregroove having a depth of 800 to 2,000 angstroms and a half width of 0.2 to 0.7 μm, which is recorded with information on a bottom part of the pregroove having the recording layer thereon.
Claim 13
Dependent Claim
20 words
The information recorded medium as claimed in claim 10, wherein said pregroove has a depth of 800 to 1,800 angstroms.
Claim 14
Dependent Claim
20 words
The information recorded medium as claimed in claim 10, wherein said pregroove has a depth of 1,000 to 1,500 angstroms.
Claim 15
Dependent Claim
21 words
The information recorded medium as claimed in claim 10, wherein said pregroove has a half width of 0.4 to 0.7 μm.
Claim 16
Dependent Claim
22 words
The information recorded medium as claimed in claim 10, wherein the recorded infromation is composed of EFM signals according to CD format.
Claim 17
Dependent Claim
37 words
The information recorded medium as claimed in claim 1, wherein the recorded information is composed of a cavity between the recording layer and the reflecting layer and cavity formed between the recording layer and the reflecting layer.
Claim 18
Dependent Claim
29 words
The information recorded medium as claimed in claim 15, wherein the recorded information is composed of a rise of the surface on the recording layer side of the substrate.
Claim 19
Dependent Claim
39 words
The information recorded medium as claimed in claim 10, wherein said dye is at least one dye selected from the group consisting of a cyanine dye, a squarillium dye, an azulenium dye, an imidazoquinoxaline dye and a phthalocyanine dye.
Claim 20
Dependent Claim
30 words
The information recorded medium as claimed in claim 10, wherein said substrate is made of a polymer compound selected from the group consisting of polycarbonate, polymethyl methacrylate and amorphous polyolefin.
Claim 21
Dependent Claim
30 words
The information recorded medium as claimed in claim 10, wherein said metal is a metal selected from the group consisting of Au, Ag, Cu, Ni, Pt, Cr, Ti and Al.
Claim 22
Dependent Claim
19 words
The information recorded medium as claimed in claim 10, wherein on said reflecting layer is provided a protective layer.
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) | 1994-12-23 | 1995-06-24 | 1995-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-12-23 | 1999-06-24 | 1999-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-12-23 | 2003-06-24 | 2003-12-24 | $7700.00 | Window Closed / Lapsed |