US4904567A
Expired / Lapsed
US
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Optical recording member
Assignee: Mitsubishi Chemical Corp
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Filing: 1988-02-18
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Granted: 1990-02-27
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Expires: 2008-02-18
Abstract
Abstract An optical recording member comprising a recording layer containing a light abosrbing substance supported on a substrate in which recording is made by the thermal deformation of the recording layer owing to laser beams and reproduction is made by the reading the difference of the reflection between the non-deformation portion and the deformation portion, said light absorbing substance being represented by the following formula: <IMAGE> (I) wherein one of X and Y is -O(C2H4O)nR wherein R is an alkyl group which may be branched and n is a number of from 1 to 6, and the other is a hydrogen atom, and A is VO, Cu, Ni, or Co.
Inventors
- 👤 Shuichi Maeda
- 👤 Yutaka Kurose
- 👤 Junko Wada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:08
CPC Classifications
C; C09; C09B; C09B47/00; C09B47/04; C09B47/06; C09B47/063; C09B47/045; G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/242; G11B7/244; G11B7/246; G11B7/248; Y; Y10; Y10S; Y10S430/00; Y10S430/146
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
114 words
An optical recording member comprising a recording layer containing a light absorbing substance supported on a substrate in which recording is made by the thermal deformation of the recording layer owing to laser beams and reproduction is made by the reading the difference of the reflection between the non-deformation portion and the deformation portion, said light absorbing substance being represented by the following formula: ##STR10## wherein one of X and Y is --O(C 2 H 4 O) n R wherein R is an alkyl group which may be branched and n is a number of from 1 to 6, and the other is a hydrogen atom, and A is VO, Cu, Ni or Co.
Claim 2
Dependent Claim
114 words
An optical recording member comprising a recording layer containing a light absorbing substance supported on a substrate in which recording is made by the thermal deformation of the recording layer owing to laser beams and reproduction is made by the reading the difference of the reflection between the non-deformation portion and the deformation portion, said light absorbing substance being represented by the following formula: ##STR10## wherein one of X and Y is --O(C 2 H 4 O) n R wherein R is an alkyl group which may be branched and n is a number of from 1 to 6, and the other is a hydrogen atom, and A is VO, Cu, Ni or Co.
Claim 3
Dependent Claim
16 words
The optical recording member according to claim 1, wherein A in the formula I is VO.
Claim 4
Dependent Claim
35 words
The optical recording member according to claim 1, wherein R in the formula I is an alkyl group having from 1 to 8 carbon atoms, and n is a number of from 1 to 3.
Claim 5
Dependent Claim
35 words
The optical recording member according to claim 1, wherein R in the formula I is an alkyl group having from 1 to 4 carbon atoms, and n is a number of from 1 to 3.
Claim 6
Dependent Claim
30 words
The optical recording member according to claim 1, wherein A in the formula I is VO, R is --CH 2 CH 2 CH 2 CH 3 and n is 3.
Claim 7
Dependent Claim
22 words
The optical recording member according to claim 1, wherein the recording layer has a thickness of from 100 Å to 5 μm.
Claim 8
Dependent Claim
22 words
The optical recording member according to claim 6, wherein the recording layer has a thickness of from 500 Å to 3 μm.
Claim 9
Dependent Claim
17 words
The optical recording member according to claim 1, wherein the substrate is made of a methacrylic resin.
References Cited (Backward Citations)
GB1489394A
Cited
US4492750A
Cited
US4648992A
Cited
US4725525A
Cited
DE3622590A1
Cited
US4769307A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-02-26 | 1993-08-28 | 1994-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-26 | 1997-08-28 | 1998-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-26 | 2001-08-28 | 2002-02-27 | $7700.00 | Window Closed / Lapsed |