US4412231A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light recording medium
Assignee: TDK Corp
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Filing: 1982-03-29
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Granted: 1983-10-25
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Expires: 2002-03-29
Abstract
Abstract A light recording medium which has a substrate and a recording layer provided thereon and effects recording of information by selective removal or deformation of the recording layer by laser light, which is characterized by that said recording layer contains an organic dye as a light absorber, said dye is a mixed dye obtained by mixing a plurality of dyes having different light absorbing wavelengths from each other and the recording layer has a light absorptivity of 80% or more at all the wavelengths in the range of 400-900 nm in wavelength.
Inventors
- 👤 Kenryo Namba
- 👤 Akihiko Kuroiwa
- 👤 Shiro Nakagawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:03
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/242; G11B7/244; G11B7/246; G11B2007/24612; G11B7/247; G11B7/2472; G11B7/252; G11B7/253; G11B7/2531; G11B7/2533; Y; Y10; Y10S; Y10S430/00; Y10S430/146; Y10S430/165
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
99 words
In a light recording medium which has a substrate and a recording layer provided on said substrate and effects recording of information by selective removal or deformation of the recording layer by laser light, the light recording medium which is characterized by that said recording layer contains an organic dye as a light absorber, said dye is a mixed dye obtained by mixing a plurality of dyes having different light absorbing wavelengths from each other and the recording layer has a light absorptivity of 80% or more at the whole wavelengths in the range of 400-900 nm in wavelength.
Claim 2
Dependent Claim
99 words
In a light recording medium which has a substrate and a recording layer provided on said substrate and effects recording of information by selective removal or deformation of the recording layer by laser light, the light recording medium which is characterized by that said recording layer contains an organic dye as a light absorber, said dye is a mixed dye obtained by mixing a plurality of dyes having different light absorbing wavelengths from each other and the recording layer has a light absorptivity of 80% or more at the whole wavelengths in the range of 400-900 nm in wavelength.
Claim 3
Dependent Claim
22 words
The light recording medium according to claim 1 wherein the variation of the light absorptivity of said recording layer is within ±10%.
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) | 1986-10-24 | 1987-04-25 | 1987-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-24 | 1991-04-25 | 1991-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-24 | 1995-04-25 | 1995-10-25 | $7700.00 | Window Closed / Lapsed |