US4614951A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical recording medium
Assignee: Canon Inc
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Filing: 1985-12-05
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Granted: 1986-09-30
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Expires: 2005-12-05
Abstract
Abstract An optical recording medium, comprising a substrate and a thin film which contains an iodine compound, and a substance undergoing an optical change through absorption of electromagnetic radiation.
Inventors
- 👤 Yoichi Osato
- 👤 Ichiro Saito
- 👤 Yoshio Takasu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:06
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/252; G11B7/257; G11B7/242; G11B7/243; G11B7/253; G11B7/2533; G11B7/2535; G11B2007/24302; G11B2007/24308; G11B2007/2431; G11B2007/24312; G11B2007/24314; G11B2007/24316; G11B2007/24318; G11B2007/24326; G11B2007/24328; G11B2007/25705; G11B2007/25718; G11B7/2531; Y; Y10; Y10S; Y10S430/00; Y10S430/146
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
93 words
An optical recording medium for recording information by the formation of pits having a higher reflectivity than the areas surrounding the pits, by irradiation of a laser beam comprising: a substrate and a thin film which comprises (a) a substance capable of undergoing an optical change to form pits in said film having a high reflectivity by absorbing electromagnetic radiation from a laser beam and (b) a matrix of an iodine compound, said substance being present in said thin film in a range of from about 20 to about 70 mole %, inclusive.
Claim 2
Dependent Claim
93 words
An optical recording medium for recording information by the formation of pits having a higher reflectivity than the areas surrounding the pits, by irradiation of a laser beam comprising: a substrate and a thin film which comprises (a) a substance capable of undergoing an optical change to form pits in said film having a high reflectivity by absorbing electromagnetic radiation from a laser beam and (b) a matrix of an iodine compound, said substance being present in said thin film in a range of from about 20 to about 70 mole %, inclusive.
Claim 3
Dependent Claim
45 words
An optical recording medium according to claim 1, wherein said iodine compound is at least one compound selected from the group consisting of copper (I) iodide, cesium iodide, tin (II) iodide, antimony (III) iodide, zirconium (IV) iodide, silver iodide, lead iodide and thallium (III) iodide.
Claim 4
Dependent Claim
18 words
An optical recording medium according to claim 1, wherein said iodine compound is PbIx 1 (0<x 1 ≦2).
Claim 5
Dependent Claim
18 words
An optical recording medium according to claim 1, wherein said iodine compound is TlIx 2 (0<x 2 ≦3).
Claim 6
Dependent Claim
32 words
An optical recording medium according to claim 1, wherein the substance undergoing an optical change through absorption of electromagnetic radiation is a substance which undergoes an optical change by action of heat.
Claim 7
Dependent Claim
40 words
An optical recording medium according to claim 5, wherein the substance undergoing an optpical change through absorption of electromagnetic radiation is at least one substance selected from the group consisting of Te, Pb, Au, Sn, As, Bi, In and carbon.
Claim 8
Dependent Claim
23 words
An optical recording medium according to claim 6, wherein said electromagnetic radiation is a semiconductor laser, argon gas laser or helium-neon gas laser.
Claim 9
Dependent Claim
31 words
An optical recording medium according to claim 1, wherein a protective layer is provided on said thin film containing a substance which undergoes an optical change through absorption of electromagnetic radiation.
Claim 10
Dependent Claim
32 words
An optical recording medium according to claim 1, wherein a reflection preventing film is provided on said thin film containing a substance which undergoes an optical change through absorption of electromagnetic radiation.
Claim 11
Dependent Claim
34 words
An optical recording medium according to claim 1, wherein a reflection layer is provided between said substrate and said thin film containing a substance which undergoes an optical change through absorption of electromagnetic radiation.
Claim 12
Dependent Claim
16 words
An optical recording medium according to claim 1, wherein the substrate is polyester or polymethyl methacrylate.
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) | 1989-09-29 | 1990-03-31 | 1990-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-29 | 1994-03-31 | 1994-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-29 | 1998-03-31 | 1998-09-30 | $7700.00 | Window Closed / Lapsed |