US5985401A
Expired / Lapsed
US
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Optical information recording medium
Assignee: Hitachi Ltd
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Filing: 1998-06-04
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Granted: 1999-11-16
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Expires: 2018-06-04
Abstract
Abstract An optical information recording medium, which is not deteriorated after repeated reading out and writing in operations, is provided by forming a glass thin film, which varies the intensity or the intensity distribution of light, on a substrate, and providing a recording film, a protective film, and a reflecting film thereon.
Inventors
- 👤 Hiroki Yamamoto
- 👤 Takashi Naito
- 👤 Takashi Namekawa
- 👤 Yasutaka Suzuki
- 👤 Ken Takahashi
- 👤 Motoyasu Terao
- 👤 Toshimichi Shintani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:54
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/252; G11B7/2403; G11B7/24065; C; C03; C03C; C03C3/00; C03C3/04; C03C3/062; C03C3/076; C03C3/078; C03C3/083; C03C3/085; C03C3/087; C03C3/089; C03C3/091; C03C8/00; G11B7/007; G11B7/253; G11B7/2531; G11B7/257; G11B7/2578; G11B2007/00727; G11B7/242; G11B7/243; G11B2007/24302; G11B2007/24312; G11B2007/24314; G11B2007/24316; G11B2007/25301; G11B7/004; G11B7/0045; G11B7/005; G11B7/2433; G11B7/244; G11B7/246; G11B7/248; G11B7/2533; G11B7/2534; G11B7/2535; G11B7/254; G11B7/2548; G11B7/258; G11B7/2585; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10S430/00; Y10S430/146; Y10T; Y10T428/00; Y10T428/21; Y10T428/31504; Y10T428/31678
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
46 words
An optical information recording medium, which regenerates information by being irradiated with light, comprising: a substrate, a recording layer for recording information mounted on said substrate, and a glass layer, in which intensity distributions of irradiated light and transmitted light vary non-linearly, mounted on said substrate.
Claim 2
Dependent Claim
46 words
An optical information recording medium, which regenerates information by being irradiated with light, comprising: a substrate, a recording layer for recording information mounted on said substrate, and a glass layer, in which intensity distributions of irradiated light and transmitted light vary non-linearly, mounted on said substrate.
Claim 3
Dependent Claim
21 words
An optical information recording medium as claimed in claim 1, wherein said recording layer has a pit pattern representing recorded information.
Claim 4
Dependent Claim
19 words
An optical information recording medium as claimed in claim 1, wherein said recording layer records information by optical energy.
Claim 5
Dependent Claim
50 words
An optical information recording medium comprising: a substrate, a recording layer for recording information mounted on said substrate, and a reflecting film for reflecting light mounted on said recording layer, wherein said substrate is made of a glass, wherein an optical transmittance increases non-linearly with increasing intensity of irradiated light.
Claim 6
Dependent Claim
50 words
An optical information recording medium comprising: a substrate, a recording layer for recording information mounted on said substrate, and a reflecting film for reflecting light mounted on said recording layer, wherein said substrate is made of a glass, wherein an optical transmittance increases non-linearly with increasing intensity of irradiated light.
Claim 7
Dependent Claim
31 words
An optical information recording medium as claimed in any of claims 1 and 4, wherein said glass comprises at least one element selected from transition metallic elements and rare earth elements.
Claim 8
Dependent Claim
52 words
An optical information recording medium as claimed in claim 5, wherein said at least one element of transition metallic elements or rare earth elements is at least one element selected from the group consisting of Ti, V, Cr, Mn, Fe, Co, Ni, Nd, Ce, Pr, Sm, Eu, Tb, Ho, Er, and Tm.
Claim 9
Dependent Claim
79 words
An optical information recording medium as claimed in claim 6, wherein said at least one element of transition metallic elements or rare earth elements is contained in the glass: (a) in the range of 20-90% by weight converted to an oxide to the total weight of the glass when the glass is the film, and in the range of 0.1-29% by weight converted to an oxide to the total weight of the glass when the glass is the substrate.
Claim 10
Dependent Claim
59 words
An optical information recording medium as claimed in claim 1, wherein said glass comprises: SiO 2 : 6-80% by weight converted to an oxide, R 2 O: 0-20% by weight converted to an oxide (R=an alkali metallic element), B 2 O 3 : 0-30% by weight converted to an oxide, and CoO: 20-90% by weight converted to an oxide.
Claim 11
Dependent Claim
26 words
An optical information recording medium as claimed in claim 4, wherein said glass comprises cobalt oxides in the range of 0.1-29% by weight converted to CoO.
Claim 12
Dependent Claim
59 words
An optical information recording medium comprising: a substrate, whereon a recording layer for recording information is formed, and a super resolution layer, wherein optical transmittance increases non-linearly with increasing intensity of irradiated light, mounted on said substrate, wherein said information recording medium is capable of maintaining at least 90% of output power after repeating recording by 10 4 times.
Claim 13
Dependent Claim
59 words
An optical information recording medium comprising: a substrate, whereon a recording layer for recording information is formed, and a super resolution layer, wherein optical transmittance increases non-linearly with increasing intensity of irradiated light, mounted on said substrate, wherein said information recording medium is capable of maintaining at least 90% of output power after repeating recording by 10 4 times.
Claim 14
Dependent Claim
69 words
An optical information recording medium comprising: a substrate, and a recording layer for recording information mounted on said substrate, wherein said information recording medium has a decrease in output of recorded signal at a frequency of 8 MHz within -30 dB of the output at 1 kHz, and said information recording medium is capable of maintaining at least 90% of output power after repeating recording by 10 4 times.
Claim 15
Dependent Claim
69 words
An optical information recording medium comprising: a substrate, and a recording layer for recording information mounted on said substrate, wherein said information recording medium has a decrease in output of recorded signal at a frequency of 8 MHz within -30 dB of the output at 1 kHz, and said information recording medium is capable of maintaining at least 90% of output power after repeating recording by 10 4 times.
Claim 16
Dependent Claim
48 words
A glass comprising: SiO 2 : 6-80% by weight converted to an oxide, R 2 O: 0-20% by weight converted to an oxide (R=an alkali metallic element), B 2 O 3 : 0-30% by weight converted to an oxide, and CoO: 0.1-29% by weight converted to an oxide.
Claim 17
Dependent Claim
48 words
A glass comprising: SiO 2 : 6-80% by weight converted to an oxide, R 2 O: 0-20% by weight converted to an oxide (R=an alkali metallic element), B 2 O 3 : 0-30% by weight converted to an oxide, and CoO: 0.1-29% by weight converted to an oxide.
Claim 18
Dependent Claim
17 words
A glass thin film comprising cobalt oxides in the range of 20-90% by weight converted to CoO.
Claim 19
Dependent Claim
17 words
A glass thin film comprising cobalt oxides in the range of 20-90% by weight converted to CoO.
References Cited (Backward Citations)
JPH06162564A
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JPH06267078A
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US5604002A
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US5569517A
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JPH0896412A
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US5817389A
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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) | 2002-11-15 | 2003-05-17 | 2003-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-11-15 | 2007-05-17 | 2007-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-11-15 | 2011-05-17 | 2011-11-16 | $7700.00 | Window Closed / Lapsed |