US5604002A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical recording medium and reproducing method therefor
Assignee: Sanyo Electric Co Ltd
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Filing: 1995-03-21
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Granted: 1997-02-18
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Expires: 2015-03-21
Abstract
Abstract An optical recording medium includes a recording layer, and a masking layer which is converted to a state having small absorption at the wavelength of a reproducing beam due to progress of decoloration caused by a thermal reaction upon irradiation with the reproducing beam, or due to facilitation of decoloration caused by a photon mode photochromic reaction through temperature rise upon irradiation with the reproducing beam.
Inventors
- 👤 Tsuyoshi Tsujioka
- 👤 Toshio Harada
- 👤 Kazuhiko Kuroki
- 👤 Fumio Tatezono
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:11
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/004; G11B7/005; C; C09; C09K; C09K9/00; C09K9/02; G11B11/00; G11B11/10; G11B11/105; G11B11/10502; G11B11/10515; G11B11/10582; G11B11/10586; G11B7/24; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10S430/00; Y10S430/146; Y10T; Y10T428/00; Y10T428/21
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
71 words
An optical recording medium comprising: a recording layer; and a masking layer which has the capacity to: be converted to a state having low absorption of light having the wavelength of a reproducing beam through a photon mode photochromic reaction facilitated by temperature rise upon irradiation with said reproducing beam; and not be substantially converted to said state through a thermal reaction in the absence of said photon mode photochromic reaction.
Claim 2
Dependent Claim
71 words
An optical recording medium comprising: a recording layer; and a masking layer which has the capacity to: be converted to a state having low absorption of light having the wavelength of a reproducing beam through a photon mode photochromic reaction facilitated by temperature rise upon irradiation with said reproducing beam; and not be substantially converted to said state through a thermal reaction in the absence of said photon mode photochromic reaction.
Claim 3
Dependent Claim
49 words
The optical recording medium in accordance with claim 1, wherein said masking layer is converted to a state having large absorption at said wavelength of said reproducing beam by a photon mode photochromic reaction upon irradiation with a beam of a specific wavelength being different from said reproducing beam.
Claim 4
Dependent Claim
27 words
The optical recording medium in accordance with claim 1, wherein said masking layer is provided on a side of receiving said reproducing beam of said recording layer.
Claim 5
Dependent Claim
107 words
A reproducing method for an optical recording medium being adapted to irradiate said recording layer of the optical recording medium in accordance with claim 1 with a reproducing beam for reproducing information recorded therein, said method comprising the steps of: irradiating said masking layer with a beam of a specific wavelength for reducing transmittance of said masking layer at the wavelength of said reproducing beam; and causing a photon mode photochromic reaction being facilitated by temperature rise by irradiating said masking layer having reduced transmittance with said reproducing beam for improving transmittance of a part of said masking layer corresponding to a part of reproducing beam spot.
Claim 6
Dependent Claim
32 words
The reproducing method for an optical recording medium in accordance with claim 4, wherein said beam of a specific wavelength has a spot size being larger than that of said reproducing beam.
Claim 7
Dependent Claim
30 words
The optical recording medium as claimed in claim 1 wherein said masking layer has a high optical density prior to its having been subjected to irradiation by said reproducing beam.
Claim 8
Dependent Claim
16 words
The optical recording medium as claimed in claim 1 wherein said masking layer comprises a diarylethene.
Claim 9
Dependent Claim
21 words
The optical recording medium as claimed in claim 7 wherein said diarylethene comprises a compound of the following structural formula: ##STR7##
Claim 10
Dependent Claim
21 words
The optical recording medium as claimed in claim 7 wherein said diarylethene comprises a compound of the following structural formula: ##STR8##
Claim 11
Dependent Claim
19 words
The optical recording medium as claimed in claim 7 wherein said diarylethene comprises a compound of the formula: ##STR9##
Claim 12
Dependent Claim
21 words
The optical recording medium as claimed in claim 7 wherein said diarylethene comprises a compound of the following structural formula: ##STR10##
Claim 13
Dependent Claim
80 words
An optical recording medium comprising: a recording layer; and a masking layer which contains a sufficient amount of a diarylethene material to facilitate a photon mode photochromic reaction, wherein said diarylethene has the following general formula: ##STR11## wherein R 1 to R 5 represent an alkyl group, a halogen atom, a hydrogen atom, a trifluoromethyl group, an alkoxy group, a cyano group, an amino group or a dimethyl amino group, and B represents a hydrocarbon ring or a heterocyclic ring.
Claim 14
Dependent Claim
80 words
An optical recording medium comprising: a recording layer; and a masking layer which contains a sufficient amount of a diarylethene material to facilitate a photon mode photochromic reaction, wherein said diarylethene has the following general formula: ##STR11## wherein R 1 to R 5 represent an alkyl group, a halogen atom, a hydrogen atom, a trifluoromethyl group, an alkoxy group, a cyano group, an amino group or a dimethyl amino group, and B represents a hydrocarbon ring or a heterocyclic ring.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-02-18 | 2000-08-19 | 2001-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-02-18 | 2004-08-19 | 2005-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-02-18 | 2008-08-19 | 2009-02-18 | $7700.00 | Window Closed / Lapsed |