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US5100711A
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US
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Optical recording medium optical recording method, and optical recording device used in method
Assignee: Nippon Paper Industries Co Ltd
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Filing: 1990-02-05
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Granted: 1992-03-31
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Expires: 2010-02-05
Abstract
Abstract Features of the present invention are connected with an optical recording medium which comprises a substrate, a heat-senstive color-developing layer containing a basic dye and an organic developer, and a light-absorbing layer containing a near infrared absorbent, the aforesaid layers being superposed upon the substrate, a reflectance at the dominant wave length of a laser beam on the surface of the recording medium being from 15 to 65%; a method for recording by irradiating the optical recording medium with a laser beam condensed by a condenser having a focal length of 0.5 mm or more and a numerical aperture (N.A) of 0.1 to 0.5; and a device for use in the above-mentioned method.
Inventors
- 👤 Toshimi Satake
- 👤 Tomoaki Nagai
- 👤 Hiroshi Fukui
- 👤 Akio Sekine
- 👤 Miyuki Yokoyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:26
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/40; B41M5/46; B41M5/465; B41M5/30; G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/242; G11B7/244; G11B7/252; G11B7/253; B41M5/42; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10S430/00; Y10S430/146; Y10S430/165
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
81 words
An optical recording medium on which recording is made by a laser beam having the dominant wave length in the vicinity of near infrared rays which comprises a substrate, a heat-sensitive color-developing layer containing a basic dye and an organic developer, and a light-absorbing layer containing a near infrared absorbent, said layers being superposed upon said substrate, wherein a reflectance at the dominant wave length of a laser beam on the surface of said recording medium being from 15 to 65%.
Claim 2
Dependent Claim
81 words
An optical recording medium on which recording is made by a laser beam having the dominant wave length in the vicinity of near infrared rays which comprises a substrate, a heat-sensitive color-developing layer containing a basic dye and an organic developer, and a light-absorbing layer containing a near infrared absorbent, said layers being superposed upon said substrate, wherein a reflectance at the dominant wave length of a laser beam on the surface of said recording medium being from 15 to 65%.
Claim 3
Dependent Claim
28 words
An optical recording medium according to claim 1 wherein said near infrared absorbent is a water-soluble organic near infrared absorbent or a finely ground organic near infrared absorbent.
Claim 4
Dependent Claim
115 words
An optical recording medium with a protective medium on which recording is made by a laser beam having a dominant wave length in the vicinity of near infrared rays, said optical recording medium being characterized by comprising a substrate, a heat-sensitive color-developing material comprising a basic colorless dye and an organic developer which causes said dye to develop a color when thermally dissolved, a recording layer containing water or an organic solvent-soluble near infrared absorbent and/or water and an organic solvent-insoluble near infrared absorbent which absorb near infrared rays and generate heat, and a protective medium which is permeable to visible rays and the near infrared rays and which is superposed upon said recording layer.
Claim 5
Dependent Claim
115 words
An optical recording medium with a protective medium on which recording is made by a laser beam having a dominant wave length in the vicinity of near infrared rays, said optical recording medium being characterized by comprising a substrate, a heat-sensitive color-developing material comprising a basic colorless dye and an organic developer which causes said dye to develop a color when thermally dissolved, a recording layer containing water or an organic solvent-soluble near infrared absorbent and/or water and an organic solvent-insoluble near infrared absorbent which absorb near infrared rays and generate heat, and a protective medium which is permeable to visible rays and the near infrared rays and which is superposed upon said recording layer.
Claim 6
Dependent Claim
37 words
An optical recording medium having a protective medium according to claim 3 wherein the reflectance at said dominant wave length of said recording beam on the surface of said optical recording layer is from 15 to 65%.
Claim 7
Dependent Claim
26 words
An optical recording medium having a protective medium according to claim 3 or 4 wherein said protective medium has the surface subjected to a reflection-preventing treatment.
Claim 8
Dependent Claim
81 words
A laser optical recording device in which recording is made on an optical recording medium comprising a hydrophilic substrate, a light-absorbing layer containing a near infrared absorbent, and a heat-sensitive color-developing layer containing a basic dye and an organic developer, said layers being superposed upon said substrate, said device being characterized by comprising a laser beam generation element and a laser beam condenser having a focal length of 0.5 mm or more and a numerical aperture (N.A) of 0.1 to 0.5.
Claim 9
Dependent Claim
81 words
A laser optical recording device in which recording is made on an optical recording medium comprising a hydrophilic substrate, a light-absorbing layer containing a near infrared absorbent, and a heat-sensitive color-developing layer containing a basic dye and an organic developer, said layers being superposed upon said substrate, said device being characterized by comprising a laser beam generation element and a laser beam condenser having a focal length of 0.5 mm or more and a numerical aperture (N.A) of 0.1 to 0.5.
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) | 1995-03-31 | 1995-09-30 | 1996-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-03-31 | 1999-09-30 | 2000-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-03-31 | 2003-09-30 | 2004-03-31 | $7700.00 | Window Closed / Lapsed |