Patent US5254382A successfully refreshed from Google Patents.
US5254382A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical recording medium
Assignee: Fujifilm Business Innovation Corp
•
Filing: 1991-11-25
•
Granted: 1993-10-19
•
Expires: 2011-11-25
Abstract
Abstract A optical recording medium comprising a substrate having provided thereon a recording layer whose optical properties reversibly change on application of light or heat or a like means to conduct recording, reproduction, or erasing of information is disclosed, wherein said recording layer comprises a recording material mainly composed of Ge, Sb, Te and In, and is a mixture of Ge-Sb-Te and In 1-x Te x wherein 0.4 <x<0.6. The optical recording medium achieves rewriting of information at a high speed and retains recorded information for a prolonged period of time medium whose optical properties change on irradiation with a condensed light beam, such as a laser beam, to conduct recording, reproduction or erasing of information. More particularly, it relates to an improved photo recording medium with which rewriting of information can be carried out at an increased speed and the recorded information can be maintained stably for an extended period of time.
Inventors
- 👤 Osamu Ueno
- 👤 Hideo Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:20
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/242; G11B7/243; G11B2007/24302; G11B2007/2431; G11B2007/24312; G11B2007/24314; G11B2007/24316; G11B7/252; G11B7/257; G11B2007/25705; G11B2007/25706; G11B2007/25716; G11B7/253; G11B7/2531; G11B7/254; G11B7/2542; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
57 words
An optical recording medium comprising a substrate having provided thereon a recording layer whose optical properties reversibly change on application of light or heat to conduct recording, reproduction, or erasing of information, said recording layer comprising a recording material selected from the group consisting of ##EQU1## wherein 0.4≦y≦0.6, 0.3≦z≦0.5, 0.4≦x≦0.6, 0.1≦a≦0.5, 0.01≦b≦0.3, 0.25≦A≦0.75, 0.02≦B≦0.35 and 0.05 ≦C≦0.6.
Claim 2
Dependent Claim
57 words
An optical recording medium comprising a substrate having provided thereon a recording layer whose optical properties reversibly change on application of light or heat to conduct recording, reproduction, or erasing of information, said recording layer comprising a recording material selected from the group consisting of ##EQU1## wherein 0.4≦y≦0.6, 0.3≦z≦0.5, 0.4≦x≦0.6, 0.1≦a≦0.5, 0.01≦b≦0.3, 0.25≦A≦0.75, 0.02≦B≦0.35 and 0.05 ≦C≦0.6.
Claim 3
Dependent Claim
31 words
An optical recording medium as in claim 1, wherein said recording material has the composition represented by {(Ge.sub.y Te.sub.1-y).sub.a (Sb.sub.z Te.sub.1-z).sub.1-a }.sub.1-b (In.sub.1-x Te.sub.x).sub.b wherein 0.4≦y≦0.6, 0.3≦z≦0.5, 0.4≦x≦0.6, 0.1≦a≦0.5 and 0.01≦b≦0.3.
Claim 4
Dependent Claim
26 words
An optical recording medium as in claim 1, wherein said recording material has the composition represented by {(GeTe).sub.A (Sb.sub.2 Te.sub.3).sub.1-A }.sub.1-B (InTe).sub.B wherein 0.25≦A≦0.75 and 0.02≦B≦0.35.
Claim 5
Dependent Claim
23 words
An optical recording medium as in claim 1, wherein said recording material has the composition represented by (Ge.sub.2 Sb.sub.2 Te.sub.5).sub.1-C (InTe).sub.C wherein 0.05≦C≦0.6.
Claim 6
Dependent Claim
40 words
An optical recording medium as in claim 1, wherein aid recording material has the composition fallen within both the regions, at the same time, indicated with slant lines in FIGS. 4 and 5 and on the lines surrounding the regions.
Claim 7
Dependent Claim
64 words
An optical recording medium as in claim 1, which further contains up to 5 atom %, based on the total amount of Ge, Sb, Te and In, of an element or elements selected from the group consisting of Ti, Co, Cr, Ni, Zn, Mg, Pt, Pd, Ga, Tl, Al, Cu, Ag, Au, O, Si, Pb, Sn, As, Bi, Se, S, N, C and F.
Claim 8
Dependent Claim
61 words
An optical recording medium comprising a substrate having provided thereon a recording layer whose optical properties reversibly change on application of light or heat to conduct recording, reproduction, or erasing of information, said recording layer comprising a recording material which is mainly composed of Ge, Sb, Te and In and is a mixture of Ge-Sb-Te and In 3 SbTe 2 .
Claim 9
Dependent Claim
61 words
An optical recording medium comprising a substrate having provided thereon a recording layer whose optical properties reversibly change on application of light or heat to conduct recording, reproduction, or erasing of information, said recording layer comprising a recording material which is mainly composed of Ge, Sb, Te and In and is a mixture of Ge-Sb-Te and In 3 SbTe 2 .
References Cited (Backward Citations)
US5095479A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-10-18 | 1997-04-19 | 1997-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-10-18 | 2001-04-19 | 2001-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-10-18 | 2005-04-19 | 2005-10-19 | $7700.00 | Window Closed / Lapsed |