US4889757A
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US
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Optical recording disk
Assignee: Hitachi Ltd
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Filing: 1987-02-19
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Granted: 1989-12-26
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Expires: 2007-02-19
Abstract
Abstract In an optical recording disk wherein a resin layer cured with ultraviolet radiation is provided on a surface of a transparent substrate, the present invention consists in that a material having a heat distortion temperature of at least 65 DEG C. is employed for the ultraviolet-cured resin layer. The appearance of wrinkles on a UV-cured resin surface is suppressed, whereby an optical recording disk of high carrier-to-noise ratio and long lifetime can be provided.
Inventors
- 👤 Shinkichi Horigome
- 👤 Toshio Niihara
- 👤 Norio Ohta
- 👤 Yutaka Sugita
- 👤 Yoshinori Miyamura
- 👤 Ryoichi Sudo
- 👤 Hiroaki Miwa
- 👤 Tetsuo Tajima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:49
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/252; G11B11/00; G11B11/10; G11B11/105; G11B11/10582; G11B7/254; G11B7/2542; G11B7/242; G11B7/243; G11B2007/24302; G11B2007/24304; G11B7/253; G11B7/2531; G11B7/2533; G11B7/2548; G11B7/256; G11B7/257; G11B7/2578; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10S430/00; Y10S430/146; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551; Y10T428/31598
Claims Analysis
Total Claims: 35
Claim 1
Independent Claim
53 words
An optical recording disk comprising a transparent substrate; a layer of an ultraviolet-cured resin provided on a surface of said transparent substrate; and a recording film provided over said layer of ultraviolet-cured resin; wherein a material whose heat distortion temperature is not lower than about 65° C. is employed as the ultraviolet-cured resin.
Claim 2
Dependent Claim
53 words
An optical recording disk comprising a transparent substrate; a layer of an ultraviolet-cured resin provided on a surface of said transparent substrate; and a recording film provided over said layer of ultraviolet-cured resin; wherein a material whose heat distortion temperature is not lower than about 65° C. is employed as the ultraviolet-cured resin.
Claim 3
Dependent Claim
101 words
An optical recording disk as defined in claim 1, wherein said ultraviolet-cured resin is an ultraviolet-curable resin composite which is composed of 100 parts by weight of a mixture consisting of 10-60 parts by weight of a compound indicated by the following formula (I) and 90-40 parts by weight of a compound indicated by the following formula (II), and 0.1-5.0 parts by weight of a photoinitiator mixed in 100 parts by weight of said mixture, and which is cured: ##STR3## (where each of R 1 and R 2 denotes hydrogen or a methyl group, and n denotes an integer of n=5-12).
Claim 4
Dependent Claim
158 words
An optical recording disk as defined in claim 1, wherein said ultraviolet-cured resin is an ultraviolet-curable resin composite which is compoxsed of 100 parts by weight of a mixture consisting of 10-60 parts by weight of at least one member selected from the group consisting of compounds indicated by the following formula (III) and 90-40 parts by weight of a compound indicated by the following formula (II), and 0.1-5.0 parts by weight of a photoinitiator mixed in 100 parts by weight of said mixture, and which is cured: ##STR4## (where R 1 denotes hydrogen or halogen, R 2 denotes an alkyl group whose number of carbon atoms is from 1 to 12, each of R 3 and R 4 denotes hydrogen or a methyl group, and m and n denote integers of m=1-4 and n=1-4), and ##STR5## (where each of R 1 and R 2 denotes hydrogen or a methyl group, and n denotes an integer of n=5-12).
Claim 5
Dependent Claim
80 words
An optical recording disk as defined in claim 1, wherein said ultraviolet-cured resin in an ultraviolet-curable resin composite which is composed of a mixture consisting essentially of 10-60 parts by weight of a compound indicated by the following formula (I) and 90-40 parts by weight of a compound indicated by the following formula (II), and which is cured: ##STR6## (where each of R 1 and R 2 denotes hydrogen or a methyl group, and n denotes an integer of n=5-12).
Claim 6
Dependent Claim
137 words
An optical recording disk as defined in claim 1, wherein said ultraviolet-cured resin is an ultraviolet-curable resin composite which is composed of a mixture consisting essentially of 10-60 parts by weight of at least one member selected from the group consisting of compounds indicated by the following formula (III) and 90-40 parts by weight of a compound indicated by the following formula (II), and which is cured: ##STR7## (where R 1 denotes hydrogen or halogen, R 2 denotes an alkyl group whose number of carbon atoms is from 1 to 12, each of R 3 and R 4 denotes hydrogen or a methyl group, and m and n denote integers of m=1-4 and n=1-4), and ##STR8## (where each of R 1 and R 2 denotes hydrogen or a methyl group, and n denotes an integer of n=5-12).
Claim 7
Dependent Claim
17 words
An optical recording disk as defined in claim 1, wherein said recording film is a magneto-optic film.
Claim 8
Dependent Claim
19 words
An optical recording disk as defined in claim 6, wherein said magneto-optic film is made of a TbFeCo system.
Claim 9
Dependent Claim
19 words
An optical recording disk as defined in claim 6, wherein said magneto-optic film is made of a GdTbFeCo system.
Claim 10
Dependent Claim
49 words
An optical recording disk as defined in claim 6, further comprising an enhancement film for enhancing a Kerr rotation angle and for preventing oxidation of said magneto-optic film, said enhancement film being provided on said layer of ultraviolet-cured rsin, and said recording film being provided on said enhancement film.
Claim 11
Dependent Claim
24 words
An optical recording disk as defined in claim 9, wherein said enhancement film is selected from the group consisting of SiO, AlN and SiN.
Claim 12
Dependent Claim
19 words
An optical recording disk as defined in claim 1, further comprising a protective layer provided on said recording film.
Claim 13
Dependent Claim
34 words
An optical recording disk as defined in claim 11, wherein said protective layer is made of a material selected from the group selected from SiO, SiO 2 , Si 3 N 4 and AlN.
Claim 14
Dependent Claim
24 words
An optical recording disk as defined in claim 1, wherein an upper surface of said layer of ultraviolet-cured resin is provided with tracking grooves.
Claim 15
Dependent Claim
24 words
An optical recording disk as defined in claim 1, wherein an upper surface of said layer of ultraviolet-cured resin is provided with signal pits.
Claim 16
Dependent Claim
17 words
An optical recording disk as defined in claim 2, wherein said recording film is a magneto-optic film.
Claim 17
Dependent Claim
19 words
An optical recording disk as defined in claim 15, wherein said magneto-optic film is made of a TbFeCo system.
Claim 18
Dependent Claim
19 words
An optical recording disk as defined in claim 15, wherein said magneto-optic film is made of a GdTbFeCo system.
Claim 19
Dependent Claim
49 words
An optical recording disk as defined in claim 15, further comprising an enhancement film for enhancing a Kerr rotation angle and for preventing oxidation of said magneto-optic film, said enhancement film being provided on said layer of ultraviolet-cured resin, and said recording film being provided on said enhancement film.
Claim 20
Dependent Claim
24 words
An optical recording disk as defined in claim 18, wherein said enhancement film is selected from the group consisting of SiO, AlN and SiN.
Claim 21
Dependent Claim
17 words
An optical recording disk as defined in claim 3, wherein said recording film is a magneto-optic film.
Claim 22
Dependent Claim
19 words
An optical recording disk as defined in claim 20, wherein said magneto-optic film is made of a TbFeCo system.
Claim 23
Dependent Claim
19 words
An optical recording disk as defined in claim 20, wherein said magneto-optic film is made of a GdTbFeCo system.
Claim 24
Dependent Claim
49 words
An optical recording disk as defined in claim 20, further comprising an enhancement film for enhancing a Kerr rotation angle and for preventing oxidation of said magneto-optic film, said enhancement film being provided on said layer of ultraviolet-cured resin, and said recording film being provided on said enhancement film.
Claim 25
Dependent Claim
24 words
An optical recording disk as defined in claim 23, wherein said enhancement film is selected from the group consisting of SiO, AlN and SiN.
Claim 26
Dependent Claim
17 words
An optical recording disk as defined in claim 4, wherein said recording film is a magneto-optic film.
Claim 27
Dependent Claim
19 words
An optical recording disk as defined in claim 25, wherein said magneto-optic film is made of a TbFeCo system.
Claim 28
Dependent Claim
19 words
An optical recording disk as defined in claim 25, wherein said magneto-optic film is made of a GdTbFeCo system.
Claim 29
Dependent Claim
49 words
An optical recording disk as defined in claim 25, further comprising an enhancement film for enhancing a Kerr rotation angle and for preventing oxidation of said magneto-optic film, said enhancement film being provided on said layer of ultraviolet-cured resin, and said recording film being provided on said enhancement film.
Claim 30
Dependent Claim
24 words
An optical recording disk as defined in claim 28, wherein said enhancement film is selected from the group consisting of SiO, AlN and SiN.
Claim 31
Dependent Claim
17 words
An optical recording disk as defined in claim 5, wherein said recording film is a magneto-optic film.
Claim 32
Dependent Claim
19 words
An optical recording disk as defined in claim 30, wherein said magneto-optic film is made of a TbFeCo system.
Claim 33
Dependent Claim
19 words
An optical recording disk as defined in claim 30, wherein said magneto-optic film is made of a GdTbFeCo system.
Claim 34
Dependent Claim
49 words
An optical recording disk as defined in claim 30, further comprising an enhancement film for enhancing a Kerr rotation angle and for preventing oxidation of said magneto-optic film, said enhancement film being provided on said layer of ultraviolet-cured resin, and said recording film being provided on said enhancement film.
Claim 35
Dependent Claim
24 words
An optical recording disk as defined in claim 33, wherein said enhancement film is selected from the group consisting of SiO, AlN and SiN.
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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) | 1992-12-25 | 1993-06-26 | 1993-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-12-25 | 1997-06-26 | 1997-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-12-25 | 2001-06-26 | 2001-12-26 | $7700.00 | Window Closed / Lapsed |