US4735889A
Expired / Lapsed
US
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Optical recording medium
Assignee: TDK Corp
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Filing: 1985-03-28
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Granted: 1988-04-05
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Expires: 2005-03-28
Abstract
Abstract This invention relates to an optical recording medium comprising a recording layer of a dye or dye composition on a substrate and adapted to be written and read using light such as laser or the like. The optical recording medium of the invention is characterized by further comprising a surface layer formed of a coating of a colloidal particle dispersion of a silicon base condensate on the recording layer, with improved S/N ratio as well as improved writing sensitivity and reading output of the optical recording medium.
Inventors
- 👤 Kenryo Namba
- 👤 Shigeru Asami
- 👤 Toshiki Aoi
- 👤 Kazuo Takahashi
- 👤 Akihiko Kuroiwa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 01:21
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/252; G11B7/257; G11B7/242; G11B7/244; G11B7/246; G11B7/247; G11B7/2472; G11B2007/25705; G11B2007/2571; G11B7/248; G11B7/249; G11B7/2495; G11B7/253; G11B7/2533; G11B7/2534; G11B7/254; G11B7/2572; Y; Y10; Y10S; Y10S430/00; Y10S430/146; Y10S430/162
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
78 words
An optical recording medium susceptible of being read and written on by the formation of pits in the recording layer thereof comprising a recording layer formed of a dye or dye composition on a substrate, characterized in that the medium further comprises on the recording layer a surface layer formed of a coating of a colloidal particle dispersion of a silicon based condensate which surface layer is capable of enhancing the writing sensitivity of the optical recording medium.
Claim 2
Dependent Claim
78 words
An optical recording medium susceptible of being read and written on by the formation of pits in the recording layer thereof comprising a recording layer formed of a dye or dye composition on a substrate, characterized in that the medium further comprises on the recording layer a surface layer formed of a coating of a colloidal particle dispersion of a silicon based condensate which surface layer is capable of enhancing the writing sensitivity of the optical recording medium.
Claim 3
Dependent Claim
19 words
The optical recording medium of claim 1 wherein the substrate is substantially transparent to writing light and reading light.
Claim 4
Dependent Claim
14 words
The optical recording medium of claim 1 wherein the substrate is of a resin.
Claim 5
Dependent Claim
17 words
The optical recording medium of claim 3 wherein the resin is an acrylic resin or polycarbonate resin.
Claim 6
Dependent Claim
19 words
The optical recording medium of claim 1 wherein the thickness of the surface layer is 50 to 300 Å.
Claim 7
Dependent Claim
19 words
The optical recording medium of claim 1 wherein the thickness of the recording layer is 400 to 1200 Å.
Claim 8
Dependent Claim
17 words
The optical recording medium of claim 1 wherein the dye is a cyanine dye or phthalocyanine dye.
Claim 9
Dependent Claim
23 words
The optical recording medium of claim 1 wherein the recording layer is formed of a dye composition comprising a dye and a resin.
Claim 10
Dependent Claim
17 words
The optical recording medium of claim 8 wherein the dye is a cyanine dye or phthalocyanine dye.
Claim 11
Dependent Claim
23 words
The optical recording medium of claim 1 wherein the recording layer is formed of a dye composition comprising a dye and a quencher.
Claim 12
Dependent Claim
14 words
The optical recording medium of claim 10 wherein the dye is a cyanine dye.
Claim 13
Dependent Claim
18 words
The optical recording medium of claim 1 wherein the quencher forms an ionically bonded compound with the dye.
Claim 14
Dependent Claim
14 words
The optical recording medium of claim 12 wherein the dye is a cyanine dye.
Claim 15
Dependent Claim
22 words
The optical recording medium of claim 2 wherein writing and reading are carried out from the back surface side of the substrate.
Claim 16
Dependent Claim
15 words
The optical recording medium of claim 14 wherein no reflective layer overlies the recording layer.
Claim 17
Dependent Claim
24 words
The optical recording medium of claim 1 which comprises an underlying layer on the substrate and has the recording layer on the underlying layer.
Claim 18
Dependent Claim
33 words
The optical recording medium of claim 16 wherein the underlying layer is formed of a coating of a colloidal particle dispersion of a silicon base condensate and the substrate is of a resin.
Claim 19
Dependent Claim
17 words
The optical recording medium of claim 17 wherein the resin is an acrylic resin or polycarbonate resin.
Claim 20
Dependent Claim
19 words
The optical recording medium of claim 17 wherein the thickness of the underlying layer is 50 to 500 Å.
Claim 21
Dependent Claim
19 words
The optical recording medium of claim 19 wherein the thickness of the surface layer is 50 to 300 Å.
Claim 22
Dependent Claim
19 words
The optical recording medium of claim 20 wherein the thickness of the recording layer is 400 to 1200 Å.
Claim 23
Dependent Claim
17 words
The optical recording medium of claim 17 wherein the dye is a cyanine dye or phthalocyanine dye.
Claim 24
Dependent Claim
23 words
The optical recording medium of claim 17 wherein the recording layer is formed of a dye composition comprising a dye and a resin.
Claim 25
Dependent Claim
17 words
The optical recording medium of claim 23 wherein the due is a cyanine dye or phthalocyanine dye.
Claim 26
Dependent Claim
23 words
The optical recording medium of claim 17 wherein the recording layer is formed of a dye composition comprising a dye and a quencher.
Claim 27
Dependent Claim
14 words
The optical recording medium of claim 25 wherein the dye is a cyanine dye.
Claim 28
Dependent Claim
18 words
The optical recording medium of claim 17 wherein the quencher forms an ionically bonded compound with the dye.
Claim 29
Dependent Claim
14 words
The optical recording medium of claim 27 wherein the dye is a cyanine dye.
Claim 30
Dependent Claim
22 words
The optical recording medium of claim 17 wherein writing and reading are carried out from the back surface side of the substrate.
Claim 31
Dependent Claim
27 words
The optical recording medium of claim 29 wherein the substrate is substantially transparent to writing light and reading light, and no reflective layer overlies the recording layer.
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) | 1991-04-05 | 1991-10-05 | 1992-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-04-05 | 1995-10-05 | 1996-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-04-05 | 1999-10-05 | 2000-04-05 | $7700.00 | Window Closed / Lapsed |