Patent US4719613A successfully refreshed from Google Patents.
US4719613A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical recording medium having a reflective recording layer including a resinous binder and a naphthalocyanine dye
Assignee: Yamamoto Chemicals Inc
•
Filing: 1986-08-19
•
Granted: 1988-01-12
•
Expires: 2006-08-19
Abstract
Abstract An optical recording medium comprising practically a naphthalocyanine dye represented by the following general formula (I): <IMAGE> (I) wherein M means a metal, metal oxide or metal halide, and -OR1, -OR2, -OR3 and -OR4 are the same or different and denote ether groups respectively having R1, R2, R3 and R4 each of which is a saturated or unsaturated hydrocarbon group having 4-12 carbon atoms.
Inventors
- 👤 Sumio Hirose
- 👤 Hiroshi Ozawa
- 👤 Kenji Abe
- 👤 Yoichi Hosono
- 👤 Shigeru Takahara
- 👤 Tadashi Koike
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:58
CPC Classifications
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: 10
Claim 1
Independent Claim
109 words
An optical recording medium permitting recording and reading-out of signals, comprising a transparent substrate and an optical reflective recording layer provided directly on the substrate, said recording layer comprising substantially less than 20 wt. % of a resinous binder and a naphthalocyanine dye represented by the following general formula (I): ##STR4## wherein M means a metal, metal oxide or metal halide, and --OR 1 , --OR 2 , --OR 3 and --OR 4 are the same or different and denote ether groups respectively having R 1 , R 2 , R 3 and R 4 each of which is a saturated or unsaturated hydrocarbon group having 4-12 carbon atoms.
Claim 2
Dependent Claim
109 words
An optical recording medium permitting recording and reading-out of signals, comprising a transparent substrate and an optical reflective recording layer provided directly on the substrate, said recording layer comprising substantially less than 20 wt. % of a resinous binder and a naphthalocyanine dye represented by the following general formula (I): ##STR4## wherein M means a metal, metal oxide or metal halide, and --OR 1 , --OR 2 , --OR 3 and --OR 4 are the same or different and denote ether groups respectively having R 1 , R 2 , R 3 and R 4 each of which is a saturated or unsaturated hydrocarbon group having 4-12 carbon atoms.
Claim 3
Dependent Claim
19 words
An optical recording medium as claimed in claim 1, wherein the thickness of the recording layer is 50-300 nm.
Claim 4
Dependent Claim
19 words
An optical recording medium as claimed in claim 2, wherein the thickness of the recording layer is 60-250 nm.
Claim 5
Dependent Claim
26 words
An optical recording medium as claimed in claim 1, wherein the amount of the resinous binder in the recording layer is less than 10 wt. %.
Claim 6
Dependent Claim
26 words
An optical recording medium as claimed in claim 4, wherein the amount of the resinous binder in the recording layer is less than 5 wt. %.
Claim 7
Dependent Claim
17 words
An optical medium as claimed in claim 1, wherein the transparent substrate is a transparent plastic substrate.
Claim 8
Dependent Claim
27 words
An optical recording medium as claimed in claim 1, wherein the recording and reading-out of the signals are effected by a light beam through the transparent substrate.
Claim 9
Independent Claim
185 words
A method for recording signals, which comprises the following steps: (a) providing an optical recording medium permitting recording and reading-out of signals which comprises a transparent substrate and an optical reflective recording layer provided directly on the substrate, said recording layer comprising substantially less than 20 wt % of a resinous binder and a naphthalocyanine dye represented by the following general formula (I): ##STR5## wherein M means a metal, metal oxide or metal halide, and --OR 1 , --OR 2 , --OR 3 and --OR 4 are the same or different and denote other groups respectively having R 1 , R 2 , R 3 and R 4 each of which is a saturated or unsaturated hydrocarbon group having 4-12 carbon atoms; (b) irradiating a convergent semiconductor laser beam through the transparent substrate of the optical recording medium for writing the signals; and (c) forming pits or holes in the optical recording layer in accordance with the signals by the laser beam irradiated through the transparent substrate, which pits or holes can be read out by a laser beam irradiated thereto through the transparent substrate.
Claim 10
Independent Claim
185 words
A method for recording signals, which comprises the following steps: (a) providing an optical recording medium permitting recording and reading-out of signals which comprises a transparent substrate and an optical reflective recording layer provided directly on the substrate, said recording layer comprising substantially less than 20 wt % of a resinous binder and a naphthalocyanine dye represented by the following general formula (I): ##STR5## wherein M means a metal, metal oxide or metal halide, and --OR 1 , --OR 2 , --OR 3 and --OR 4 are the same or different and denote other groups respectively having R 1 , R 2 , R 3 and R 4 each of which is a saturated or unsaturated hydrocarbon group having 4-12 carbon atoms; (b) irradiating a convergent semiconductor laser beam through the transparent substrate of the optical recording medium for writing the signals; and (c) forming pits or holes in the optical recording layer in accordance with the signals by the laser beam irradiated through the transparent substrate, which pits or holes can be read out by a laser beam irradiated thereto through the transparent substrate.
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) | 1991-01-11 | 1991-07-13 | 1992-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-01-11 | 1995-07-13 | 1996-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-01-11 | 1999-07-13 | 2000-01-12 | $7700.00 | Window Closed / Lapsed |