US5200947A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical recording medium, optical recording method, and optical recording device used in method
Assignee: Nippon Paper Industries Co Ltd
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Filing: 1991-12-20
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Granted: 1993-04-06
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Expires: 2011-12-20
Abstract
Abstract Features of the present invention are connected with an optical recording medium 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, 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
2026-11-09 22:03
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; G11B7/246; G11B7/247; G11B7/2472; G11B7/248
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
82 words
A method for optical recording by a laser beam which comprises the step irradiating an 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, said optical recording medium being composed of 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 on said substrate.
Claim 2
Independent Claim
82 words
A method for optical recording by a laser beam which comprises the step irradiating an 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, said optical recording medium being composed of 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 on said substrate.
Claim 3
Dependent Claim
33 words
A method for optical recording by a laser beam according to claim 1 wherein said hydrophilic substrate is one selected from the group consisting of papers and plates mainly comprising a vegetable fiber.
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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) | 1996-04-05 | 1996-10-05 | 1997-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-04-05 | 2000-10-05 | 2001-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-04-05 | 2004-10-05 | 2005-04-06 | $7700.00 | Window Closed / Lapsed |