US5246758A
Expired / Lapsed
US
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Optical recording medium
Assignee: Pioneer Corp
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Filing: 1992-04-02
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Granted: 1993-09-21
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Expires: 2012-04-02
Abstract
Abstract An optical recording medium, including a substrate and a recording film disposed thereon, wherein an optical shutter layer is disposed in front of the recording film with respect to the direction of an incident reading light beam or recording light beam which is to be supplied to the optical recording medium; and the optical shutter layer comprises, as a main component, a substance having a shutter property such that the substance is in a state where it develops a color thereof until the substance is irradiated with a reading light beam, but when the substance is irradiated with the reading light beam, the substance irradiated with the reading light beam is heated up over a certain temperature so that the substance is decolored and a central portion of the optical shutter layer irradiated with the reading light beam is caused to have a light transmission.
Inventors
- 👤 Fumio Matsui
- 👤 Fumihiko Yokogawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:01
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/252; G11B7/004; G11B7/0045; G11B7/00455; G11B7/242; G11B7/243; G11B2007/24302; G11B2007/24312; G11B2007/24314; G11B2007/24316; G11B7/244; G11B7/246; G11B7/247; G11B7/2472; G11B7/248; G11B7/253; G11B7/2533; G11B7/2534; G11B7/257; G11B7/2572; G11B7/2575; G11B7/258; G11B7/2585; G11B7/259; G11B7/2595; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10S430/00; Y10S430/146; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
192 words
An optical recording medium, comprising a substrate and a recording film disposed thereon, wherein an optical shutter layer is disposed in front of the recording film with respect to the direction of an incident reading light beam or recording light beam supplied to the optical recording medium; and wherein the optical shutter layer comprises, as a main component, a substance having a shutter property, said substance consists of at least one photo-thermochromic compound selected from the group consisting of spiropyran compounds, spironapthoxazine compounds, fulgide compounds and diarylethene compounds, or at least one chemi-thermochromic compound selected from the group consisting of lactone compounds and fluoran compounds, said optical shutter layer having a thickness of about 0.02 to 1 μm, wherein the substance is in a state where it develops a color thereof until the substance is irradiated with a reading light beam, and when the substance is irradiated with the reading light beam, the substance irradiated with the reading light beam is heated over a certain temperature so that the substance is decolored and a central portion of the optical shutter layer irradiated with the reading light beam is caused to transmit light.
Claim 2
Dependent Claim
192 words
An optical recording medium, comprising a substrate and a recording film disposed thereon, wherein an optical shutter layer is disposed in front of the recording film with respect to the direction of an incident reading light beam or recording light beam supplied to the optical recording medium; and wherein the optical shutter layer comprises, as a main component, a substance having a shutter property, said substance consists of at least one photo-thermochromic compound selected from the group consisting of spiropyran compounds, spironapthoxazine compounds, fulgide compounds and diarylethene compounds, or at least one chemi-thermochromic compound selected from the group consisting of lactone compounds and fluoran compounds, said optical shutter layer having a thickness of about 0.02 to 1 μm, wherein the substance is in a state where it develops a color thereof until the substance is irradiated with a reading light beam, and when the substance is irradiated with the reading light beam, the substance irradiated with the reading light beam is heated over a certain temperature so that the substance is decolored and a central portion of the optical shutter layer irradiated with the reading light beam is caused to transmit light.
Claim 3
Dependent Claim
19 words
An optical recording medium according to claim 1, wherein a light reflection layer is formed on the recording film.
Claim 4
Dependent Claim
27 words
An optical recording medium according to claim 2, wherein said light reflection layer comprises a metal selected from the group consisting of Au, Ag, Cu and Al.
Claim 5
Dependent Claim
22 words
An optical recording medium according to claim 2, wherein said light reflection layer has a thickness of about 0.02 to 2.0 μm.
Claim 6
Dependent Claim
23 words
An optical recording medium according to claim 2, wherein an intermediate layer is disposed between said light reflection layer and said recording film.
Claim 7
Dependent Claim
18 words
An optical recording medium according to claim 1, wherein a protection layer is formed on the recording film.
Claim 8
Dependent Claim
30 words
An optical recording medium according to claim 6, wherein said protection layer comprises a resin selected from the group consisting of epoxy resins, acrylic resins, silicone resins, and urethane resins.
Claim 9
Dependent Claim
21 words
An optical recording medium according to claim 6, wherein said protection layer has a thickness of about 1 to 10 μm.
Claim 10
Dependent Claim
27 words
An optical recording medium according to claim 1, wherein said substrate is a resin selected from the group consisting of a polycarbonate resin and a polymethylmethacrylate resin.
Claim 11
Dependent Claim
20 words
An optical recording medium according to claim 1, wherein said substrate has a thickness of about 1.0 to 1.5 mm.
Claim 12
Dependent Claim
28 words
An optical recording medium according to claim 1, wherein said recording film comprises an organic coloring material selected from the group consisting of cyanine dyes and phthalocyanine dyes.
Claim 13
Dependent Claim
21 words
An optical recording medium according to claim 1, wherein said recording film has a thickness of about 20 to 3000 nm.
Claim 14
Dependent Claim
40 words
An optical recording medium according to claim 1, wherein said recording film comprises a material selected from the group consisting of As-Te-Ge materials, Sn-Te-Se materials, TeOx materials, Sb 2 , Se 3 , Bi 2 , and Te 3 .
References Cited (Backward Citations)
US5061582A
Cited
US5088086A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-09-20 | 1997-03-22 | 1997-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-09-20 | 2001-03-22 | 2001-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-09-20 | 2005-03-22 | 2005-09-21 | $7700.00 | Window Closed / Lapsed |