§
Luxuse
Patent Intelligence
Sign In
Patent US5208088A successfully refreshed from Google Patents.
← Back to Patent Explorer
US5208088A Expired / Lapsed US ⏱️ 0.0 years remaining

Optical recording medium

Assignee: TDK Corp
•
Filing: 1991-11-21
•
Granted: 1993-05-04
•
Expires: 2011-11-21
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract An optical recording medium capable of reproduction in accordance with the CD standard is provided. The medium includes a reflective thin film of Ag or similar element, an intermediate thin film of Zn or similar element, and a low-melting thin film of Te or similar element wherein light irradiation causes the reflective thin film element and the low-melting thin film element to diffuse into each other to form an alloy or compound of reduced reflectivity. It is possible to determine through simulation a combination of atoms of the respective thin films which form a cluster having HOMO where electrons in the reflective thin film atoms and electrons in the low-melting thin film atoms do not form a hybrid orbital and LUMO where electrons in the reflective thin film atoms and electrons in the low-melting thin film atoms form a hybrid orbital.

Inventors

  • 👤 Junji Tominaga
  • 👤 Hiroyuki Arioka
  • 👤 Akio Ogawa

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-04 20:52
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/252; G11B7/258; G11B7/259; G11B7/004; G11B7/0045; G11B7/00455; G11B7/242; G11B7/243; G11B7/257; G11B2007/24302; G11B2007/24304; G11B2007/24308; G11B2007/24316; G11B2007/24318; G11B2007/24324; G11B2007/25705; G11B2007/25706; G11B7/253; G11B7/2533; G11B7/2534; G11B7/254; G11B7/2542; Y; Y10; Y10S; Y10S428/00; Y10S428/913

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 121 words
An optical recording medium, comprising: a substrate, a reflective thin film on one surface of the substrate containing at least one element selected from the group consisting of Ag, Au, Cu, and Pt and being 200 to 700 A thick, an intermediate thin film on said reflective thin film containing at least one element selected from the group consisting of Zn, Al, Sn, In, Cd, Tl, Pb, and Bi and being 10 to 200 A thick, and a low-melting thin film having a melting point of about 200 to about 400 degrees C. on said intermediate thin film and containing at least one element selected from the group consisting of Te, Se, and S and being 200 to 1500 A thick.
Claim 2
Dependent Claim 121 words
An optical recording medium, comprising: a substrate, a reflective thin film on one surface of the substrate containing at least one element selected from the group consisting of Ag, Au, Cu, and Pt and being 200 to 700 A thick, an intermediate thin film on said reflective thin film containing at least one element selected from the group consisting of Zn, Al, Sn, In, Cd, Tl, Pb, and Bi and being 10 to 200 A thick, and a low-melting thin film having a melting point of about 200 to about 400 degrees C. on said intermediate thin film and containing at least one element selected from the group consisting of Te, Se, and S and being 200 to 1500 A thick.
Claim 3
Dependent Claim 31 words
The optical recording medium of claim 1 wherein the ratio of the thickness of said low-melting thin film to the thickness of said reflective thin film ranges from 1/1 to 5/1.
Claim 4
Dependent Claim 40 words
The optical recording medium of claim 1 wherein said reflective thin film consists of Ag, said intermediate thin film consists of Zn, said low-melting thin film consists of Te, and said cluster is Ag 2 Zn 2 Te 2 .

References Cited (Backward Citations)

US3959799A Cited
JPS61130089A Cited
JPH0235789A Cited
JPH0258743A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1996-05-03 1996-11-02 1997-05-04 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 2000-05-03 2000-11-02 2001-05-04 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2004-05-03 2004-11-02 2005-05-04 $7700.00 Window Closed / Lapsed

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag