Patent US5563873A successfully refreshed from Google Patents.
US5563873A
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Multilayer optical disk and apparatus
Assignee: Panasonic Holdings Corp
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Filing: 1995-02-02
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Granted: 1996-10-08
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Expires: 2015-02-02
Abstract
Abstract A multi-layer optical disk includes a plurality of recording layers and each recording layer is composed of a first layer and a second layer having respective transmission indices of T1A and T2A with respect to a disk irradiation beam intensity A and having respective transmission indices of T1B and T2B with respect to a disk irradiation beam intensity B such that T1A×T2A =T1B×T2B. The interval between one recording layer and another recording layer is at least 10 times as long as a wavelength of an optical source providing the disk irradiation beams. Furthermore, the first and second layers may have respective thicknesses of H1 and H2 and respective refractive indices of N1A and N2A with respect to a disk irradiation beam intensity A and have respective refractive indices of N1B and N2B with respect to an irradiation beam intensity B such that N1A×H1+N2A×H2=N1B×H1+N2B×H2.
Inventors
- 👤 Noboru Ito
- 👤 Shinichi Tanaka
- 👤 Sadao Mizuno
- 👤 Kenichi Nishiuchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 21:41
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/2407; G11B7/24085; G11B11/00; G11B11/10; G11B11/105; G11B11/10582; G11B11/10584; G11B7/26; G11B2007/0003; G11B2007/0009; G11B2007/0013; G11B7/004; G11B7/005
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
121 words
A multilayer optical disk comprising a plurality of recording layers, wherein each recording layer is composed of a first layer and a second layer and wherein said first and second layers respectively have transmission indices of T1A and T2A with respect to a disk irradiation beam intensity A, and wherein said first and second layers respectively have transmission indices of T1B and T2B with respect to a disk irradiation beam intensity B such that: T1A×T2A=T1B×T2B; and wherein a transparent body is disposed between each pair of said plurality of recording layers for lamination thereof and wherein an interval between one recording layer and another recording layer is at least 10 times as long as a wavelength of the disk irradiation beams.
Claim 2
Dependent Claim
121 words
A multilayer optical disk comprising a plurality of recording layers, wherein each recording layer is composed of a first layer and a second layer and wherein said first and second layers respectively have transmission indices of T1A and T2A with respect to a disk irradiation beam intensity A, and wherein said first and second layers respectively have transmission indices of T1B and T2B with respect to a disk irradiation beam intensity B such that: T1A×T2A=T1B×T2B; and wherein a transparent body is disposed between each pair of said plurality of recording layers for lamination thereof and wherein an interval between one recording layer and another recording layer is at least 10 times as long as a wavelength of the disk irradiation beams.
Claim 3
Dependent Claim
133 words
A multilayer optical disk comprises a plurality of recording layers, wherein each recording layer comprises a transparent body composed of an intermediate transparent body disposed between first and second layers and wherein said first and second layers are alternately laminated; and wherein transmission indices of said first and second layers are respectively T1A and T2A with respect to a disk irradiation beam intensity A; and wherein transmission indices of said first and second layers are respectively T1B and T2B with respect to an irradiation beam intensity B such that: T1A×T2A=T1B×T2B; and wherein said intermediate transparent body and said transparent body are approximately equal in refractive indices; and wherein an interval between one recording layer and another recording layer is at least 10 times as long as a wavelength of the disk irradiation beams.
Claim 4
Dependent Claim
133 words
A multilayer optical disk comprises a plurality of recording layers, wherein each recording layer comprises a transparent body composed of an intermediate transparent body disposed between first and second layers and wherein said first and second layers are alternately laminated; and wherein transmission indices of said first and second layers are respectively T1A and T2A with respect to a disk irradiation beam intensity A; and wherein transmission indices of said first and second layers are respectively T1B and T2B with respect to an irradiation beam intensity B such that: T1A×T2A=T1B×T2B; and wherein said intermediate transparent body and said transparent body are approximately equal in refractive indices; and wherein an interval between one recording layer and another recording layer is at least 10 times as long as a wavelength of the disk irradiation beams.
Claim 5
Dependent Claim
95 words
A multilayer optical disk comprising a plurality of recording layers, wherein each recording layer is composed of a first layer and a second layer having respective thicknesses of H1 and H2, and having respective refractive indices of N1A and N2A with respect to a disk irradiation beam intensity A and having respective refractive indices of N1B and N2B with respect to an irradiation beam intensity B such that: N1A×H1+N2A×H2=N1B×H1+N2B×H2; wherein an interval between one recording layer and another recording layer is at least 10 times as long as a wavelength of the disk irradiation beams.
Claim 6
Dependent Claim
95 words
A multilayer optical disk comprising a plurality of recording layers, wherein each recording layer is composed of a first layer and a second layer having respective thicknesses of H1 and H2, and having respective refractive indices of N1A and N2A with respect to a disk irradiation beam intensity A and having respective refractive indices of N1B and N2B with respect to an irradiation beam intensity B such that: N1A×H1+N2A×H2=N1B×H1+N2B×H2; wherein an interval between one recording layer and another recording layer is at least 10 times as long as a wavelength of the disk irradiation beams.
Claim 7
Dependent Claim
133 words
A multilayer optical disk comprising a plurality of recording layers, wherein each recording layer comprises a transparent body composed of an intermediate transparent body disposed between first and second layers and wherein said first and second layers are alternately laminated; said first and second layers having respective thicknesses of H1 and H2, and having respective transmission indices of N1A and N2A with respect to a disk irradiation beam intensity A, and having respective transmission indices of N1B and N2B with respect to an irradiation beam intensity B such that: N1A×H1+N2A×H2=N1B×H1+N2B×H2; and wherein said intermediate transparent body and said transparent body are approximately equal in refractive indices; add wherein an interval between one recording layer and another recording layer is at least 10 times as long as a wavelength of the disk irradiation beams.
Claim 8
Dependent Claim
133 words
A multilayer optical disk comprising a plurality of recording layers, wherein each recording layer comprises a transparent body composed of an intermediate transparent body disposed between first and second layers and wherein said first and second layers are alternately laminated; said first and second layers having respective thicknesses of H1 and H2, and having respective transmission indices of N1A and N2A with respect to a disk irradiation beam intensity A, and having respective transmission indices of N1B and N2B with respect to an irradiation beam intensity B such that: N1A×H1+N2A×H2=N1B×H1+N2B×H2; and wherein said intermediate transparent body and said transparent body are approximately equal in refractive indices; add wherein an interval between one recording layer and another recording layer is at least 10 times as long as a wavelength of the disk irradiation beams.
Claim 9
Dependent Claim
59 words
A multilayer optical disk as defined in claim 3, where the refractive index of a first layer with respect to the disk irradiation beam intensity A combined with the refractive index of a second layer with respect to the disk irradiation beam intensity B are approximately equal to the refractive indices of the transparent body and intermediate transparent zone.
Claim 10
Dependent Claim
60 words
A multilayer optical disk as defined in claim 4, where the refractive index of a first layer with respect to the disk irradiation beam intensity A combined with the refractive index of a second layer with respect to the disk irradiation beam intensity B are approximately equal to the refractive indices of the transparent body and the intermediate transparent zone.
Claim 11
Dependent Claim
89 words
A multilayer optical disk including a plurality of recording layers and transparent bodies, arranged such that a recording layer and a transparent body are alternately laminated, wherein a reflection index of said recording layer is made higher as a recording layer is disposed further away from a surface of the disk with respect to an incident direction of a disk irradiation optical beam impinging upon said disk and wherein an interval between adjacent recording layers is at least 10 times as long as a wavelength of the optical beam.
Claim 12
Dependent Claim
89 words
A multilayer optical disk including a plurality of recording layers and transparent bodies, arranged such that a recording layer and a transparent body are alternately laminated, wherein a reflection index of said recording layer is made higher as a recording layer is disposed further away from a surface of the disk with respect to an incident direction of a disk irradiation optical beam impinging upon said disk and wherein an interval between adjacent recording layers is at least 10 times as long as a wavelength of the optical beam.
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