EP0356064A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Information storage disk
Assignee: Panasonic Holdings Corp
•
Filing: 1989-08-08
•
Granted: —
•
Expires: 2009-08-08
Abstract
Abstract A phase change type information storage disk in which a reflective layer is formed of an alloy thin film comprising as a main component any one of Ni-Cr, Cr or Ti and a metal having a larger malleability than said main component, being easy to be initialized and strong to thermal shock.
Inventors
- 👤 Tetsuya Akiyama
- 👤 Hidemi Isomura
- 👤 Takeo Ohta
- 👤 Shigeaki Furukawa
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 22:41
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/252; G11B7/258; G11B7/2585; G11B7/259; G11B7/2595
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
83 words
An information storage disk which has on a substrate a recording layer which reversibly form amorphous crystal phase change under irradiation of light, a reflective layer comprising a metal layer for efficiently utilizing the irradiated light and a spacer layer inserted between said recording layer and reflective layer, said reflective layer comprising as a main component a metal selected from the group consisting of Ni-Cr, Cr and Ti, and as an additive a metal having a larger malleability than said main component metal.
Claim 2
Dependent Claim
83 words
An information storage disk which has on a substrate a recording layer which reversibly form amorphous crystal phase change under irradiation of light, a reflective layer comprising a metal layer for efficiently utilizing the irradiated light and a spacer layer inserted between said recording layer and reflective layer, said reflective layer comprising as a main component a metal selected from the group consisting of Ni-Cr, Cr and Ti, and as an additive a metal having a larger malleability than said main component metal.
Claim 3
Dependent Claim
36 words
An information storage disk according to Claim 1, wherein the reflective layer contains as a metal having large malleability at least one metal selected from the group consisting of Au, Ag, Pd, Pl, Cu and Al.
Claim 4
Dependent Claim
31 words
An information storage disk according to Claim 2, wherein the reflective layer comprises as a main component Ni-Cr and contains 2 to 30 at % of Au or Ag or Cu.
Claim 5
Dependent Claim
27 words
An information storage disk according to Claim 2, wherein the reflective layer comprises as a main component Ni-Cr and contains 2 to 40 at % of Al.
Claim 6
Dependent Claim
29 words
An information storage disk according to Claim 2, wherein the reflective layer comprises as a main component Ni-Cr and contains 2 to 50 at % of Pd or Pt.
Claim 7
Dependent Claim
31 words
An information storage disk according to Claim 2, wherein the reflective layer comprises as a main component Cr and contains 10 to 30 at % of Au or Ag or Cu.
Claim 8
Dependent Claim
27 words
An information storage disk according to Claim 2, wherein the reflective layer comprises as a main component Cr and contains 10 to 40 at % of Al.
Claim 9
Dependent Claim
29 words
An information storage disk according to Claim 2 wherein the reflective layer comprises as a main component Cr and contains 10 to 50 at % of Pd or Pt.
Claim 10
Dependent Claim
31 words
An information storage disk according to Claim 2, wherein the reflective layer comprises as a main component Ti and contains 5 to 30 at % of Au or Ag or Cu.
Claim 11
Dependent Claim
27 words
An information storage disk according to Claim 2 wherein the reflective layer comprises as a main component Ti and contains 5 to 40 at % of Al.
Claim 12
Dependent Claim
29 words
An information storage disk according to Claim 2, wherein the reflective layer comprises as a main component Ti and contains 5 to 50 at % of Pd or Pt.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.