US5989670A
Expired / Lapsed
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Multilayer optical disk
Assignee: Sony Corp
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Filing: 1998-05-28
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Granted: 1999-11-23
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Expires: 2018-05-28
Abstract
Abstract A multilayer optical disk having an information storage layer which can as well as be reproduced by a general purpose reproducing apparatus, for example, a compact disk player, and from which information can be read from other information storage layers by using an exclusive reproducing apparatus. The multilayer disk has a first substrate on which is formed a first information storage layer which is relatively highly reflective with respect to a light beam having a wavelength of 770-830 nm; and a second substrate on which is formed a second information layer which is relatively transparent with respect to a light beam having a first substrate on which is formed a wavelength of 770 mn to 830 nm but which is sufficiently reflective with respect to a light beam having a wavelength of 615-655 nm.
Inventors
- 👤 Masahiko Kaneko
- 👤 Nobuhiko Umezu
- 👤 Katsuhisa Aratani
- 👤 Ariyoshi Nakaoki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 21:38
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/242; G11B7/24018; G11B7/12; G11B7/125; G11B7/127; G11B7/2403; G11B7/24035; G11B7/24038; G11B7/244; G11B7/252; G11B7/257; G11B7/258; G11B2007/25705; G11B2007/2571; G11B2007/25713; G11B7/004; G11B7/005; G11B7/08; G11B7/085; G11B7/08505; G11B7/08511; G11B7/253; G11B7/2531; G11B7/2533; G11B7/2534; G11B7/254; G11B7/2542; G11B7/2578; 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: 32
Claim 1
Independent Claim
104 words
A multilayer optical disk comprising: a first information storage layer formed on a first substrate, wherein information on said first information storage layer can be reproduced with a light beam having a wavelength of 770 nm to 830 nm; a second information storage layer formed on a second substrate, wherein information on said second information storage layer can be reproduced with a light beam having a wavelength of 615 nm to 655 nm; wherein, said first and second substrates are bonded to each other, and said light beams are irradiated on each of said information storage layers from one side of said optical disk.
Claim 2
Dependent Claim
104 words
A multilayer optical disk comprising: a first information storage layer formed on a first substrate, wherein information on said first information storage layer can be reproduced with a light beam having a wavelength of 770 nm to 830 nm; a second information storage layer formed on a second substrate, wherein information on said second information storage layer can be reproduced with a light beam having a wavelength of 615 nm to 655 nm; wherein, said first and second substrates are bonded to each other, and said light beams are irradiated on each of said information storage layers from one side of said optical disk.
Claim 3
Dependent Claim
31 words
The multilayer optical disk of claim 1, wherein said second information storage layer is relatively transparent with respect to said light beam having a wavelength of 770 nm to 830 nm.
Claim 4
Dependent Claim
35 words
The multilayer optical disk of claim 1, wherein said second information storage layer has a reflector factor of about 20% with respect to said light beam having a wavelength of 615 nm to 655 nm.
Claim 5
Dependent Claim
36 words
The multilayer optical disk of claim 1, wherein said first information storage layer has a reflection factor of at least 70% with respect to said light beam having a wavelength of 770 nm to 830 nm.
Claim 6
Dependent Claim
19 words
The multilayer optical disk of claim 1, wherein said second information storage layer comprises a layer of Si--N material.
Claim 7
Dependent Claim
19 words
The multilayer optical disk of claim 1, wherein said first substrate has a thickness of 30 nm or more.
Claim 8
Dependent Claim
17 words
The multilayer optical disk of claim 1, wherein said second substrate is made of glass or plastic.
Claim 9
Dependent Claim
18 words
The multilayer optical disk of claim 1, wherein said first information storage layer comprises an A1 film layer.
Claim 10
Dependent Claim
23 words
The multilayer optical disk of claim 1, wherein information in said first information storage layer is formatted in a compact disk compatible format.
Claim 11
Dependent Claim
22 words
The multilayer optical disk of claim 1, wherein said second information storage layer comprises a layer of Si 3 N 4 material.
Claim 12
Dependent Claim
112 words
A multilayer disk comprising: a first substrate on which is formed a first information storage layer which is relatively highly reflective with respect to a light beam having a wavelength of 770-830 nm; and a second substrate on which is formed a second information layer which is relatively transparent with respect to a light beam having a first substrate on which is formed a wavelength of 770 nm to 830 nm but which is sufficiently reflective with respect to a light beam having a wavelength of 615-655 nm; wherein, said first and said second substrates are bonded together such that first and said second information storage layers do not face each other.
Claim 13
Dependent Claim
112 words
A multilayer disk comprising: a first substrate on which is formed a first information storage layer which is relatively highly reflective with respect to a light beam having a wavelength of 770-830 nm; and a second substrate on which is formed a second information layer which is relatively transparent with respect to a light beam having a first substrate on which is formed a wavelength of 770 nm to 830 nm but which is sufficiently reflective with respect to a light beam having a wavelength of 615-655 nm; wherein, said first and said second substrates are bonded together such that first and said second information storage layers do not face each other.
Claim 14
Dependent Claim
19 words
The multilayer optical disk of claim 11, wherein said second information storage layer is bonded to said first substrate.
Claim 15
Dependent Claim
35 words
The multilayer optical disk of claim 11, wherein said second information storage layer has a reflector factor of about 20% with respect to said light beam having a wavelength of 615 nm to 655 nm.
Claim 16
Dependent Claim
36 words
The multilayer optical disk of claim 11, wherein said first information storage layer has a reflection factor of at least 70% with respect to said light beam having a wavelength of 770 nm to 830 nm.
Claim 17
Dependent Claim
22 words
The multilayer optical disk of claim 11, wherein said second information storage layer comprises a layer of Si x N y material.
Claim 18
Dependent Claim
19 words
The multilayer optical disk of claim 11, wherein said first substrate has a thickness of 30 nm or more.
Claim 19
Dependent Claim
17 words
The multilayer optical disk of claim 11, wherein said second substrate is made of glass or plastic.
Claim 20
Dependent Claim
18 words
The multilayer optical disk of claim 11, wherein said first information storage layer comprises an A1 film layer.
Claim 21
Dependent Claim
23 words
The multilayer optical disk of claim 11, wherein information in said first information storage layer is formatted in a compact disk compatible format.
Claim 22
Dependent Claim
22 words
The multilayer optical disk of claim 11, wherein said second information storage layer comprises a layer of Si 3 N 4 material.
Claim 23
Dependent Claim
119 words
A multilayer optical disk having one side from which each of a plurality of information storage layers are read, comprising: a first information storage layer formed on a first substrate; a second information storage layer formed on a second substrate; an adhesive layer for bonding said first substrate to said second substrate with said second information layer interposed therebetween; wherein, a reflection factor of said first information storage layer with respect to a wavelength of 770 nm to 830 nm which is a first wavelength of reproducing light is higher than a reflection factor of said second information storage layer with respect to a wavelength of 615 nm to 655 nm which is a second wavelength of reproducing light.
Claim 24
Dependent Claim
119 words
A multilayer optical disk having one side from which each of a plurality of information storage layers are read, comprising: a first information storage layer formed on a first substrate; a second information storage layer formed on a second substrate; an adhesive layer for bonding said first substrate to said second substrate with said second information layer interposed therebetween; wherein, a reflection factor of said first information storage layer with respect to a wavelength of 770 nm to 830 nm which is a first wavelength of reproducing light is higher than a reflection factor of said second information storage layer with respect to a wavelength of 615 nm to 655 nm which is a second wavelength of reproducing light.
Claim 25
Dependent Claim
31 words
The multilayer optical disk of claim 21, wherein said second information storage layer is relatively transparent with respect to said light beam having a wavelength of 770 nm to 830 nm.
Claim 26
Dependent Claim
35 words
The multilayer optical disk of claim 21, wherein said second information storage layer has a reflector factor of about 20% with respect to said light beam having a wavelength of 615 nm to 655 nm.
Claim 27
Dependent Claim
36 words
The multilayer optical disk of claim 21, wherein said first information storage layer has a reflection factor of at least 70% with respect to said light beam having a wavelength of 770 nm to 830 nm.
Claim 28
Dependent Claim
22 words
The multilayer optical disk of claim 21, wherein said second information storage layer comprises a layer of Si 3 -N 4 material.
Claim 29
Dependent Claim
19 words
The multilayer optical disk of claim 21, wherein said first substrate has a thickness of 30 nm or more.
Claim 30
Dependent Claim
17 words
The multilayer optical disk of claim 21, wherein said second substrate is made of glass or plastic.
Claim 31
Dependent Claim
18 words
The multilayer optical disk of claim 21, wherein said first information storage layer comprises an A1 film layer.
Claim 32
Dependent Claim
23 words
The multilayer optical disk of claim 21, wherein information in said first information storage layer is formatted in a compact disk compatible format.
References Cited (Backward Citations)
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