Patent EP0426409A2 successfully refreshed from Google Patents.
EP0426409A2
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Multilayered optial disk
Assignee: Panasonic Holdings Corp
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Filing: 1990-10-29
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Granted: —
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Expires: 2010-10-29
Abstract
Abstract A multi-layered optical disk comprising a plurality of recording layers accumulated in the thickness direction wherein a light beam is focused on one of tracks of one of the layers thereby to record and reproduce data, the optical disk being characterized in that recording layers each have an identification section storing an address of the recording layer which the identification section belongs to.
Inventors
- 👤 Isao Satoh
- 👤 Yoshihisa Fukushima
- 👤 Yuji Takagi
- 👤 Yasushi Azumatani
- 👤 Hiroshi Hamasaka
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 13:32
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/2403; G11B7/24035; G11B7/24038; G11B7/007; G11B7/00736; G11B7/00745; G11B7/08; G11B7/085; G11B7/08505; G11B7/08511; G11B7/09; G11B7/0945; G11B7/26; G11B2007/0003; G11B2007/0009; G11B2007/0013; G11B7/0908
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
63 words
A multi-layered optical disk comprising a plurality of recording layers accumulated in the thickness direction wherein a light beam is focused on one of tracks of one of the layers thereby to record and reproduce data, the optical disk being characterized in that recording layers each have an identification section storing an address of the recording layer which the identification section belongs to.
Claim 2
Dependent Claim
63 words
A multi-layered optical disk comprising a plurality of recording layers accumulated in the thickness direction wherein a light beam is focused on one of tracks of one of the layers thereby to record and reproduce data, the optical disk being characterized in that recording layers each have an identification section storing an address of the recording layer which the identification section belongs to.
Claim 3
Dependent Claim
23 words
A multi-layered optical disk of Claim 1, wherein the identification section stores an address of the track which the identification section belongs to.
Claim 4
Dependent Claim
35 words
A multi-layered optical disk of Claim 1, wherein the tracks of two of the layers neighboring in the thickness direction are shifted against each other in the radial direction by half of a track pitch.
Claim 5
Dependent Claim
15 words
A multi-layered optical disk of Claim 3, wherein the optical disk has two recording layers.
Claim 6
Dependent Claim
16 words
A multi-layered optical disk of Claim 1, wherein the tracks each comprise a plurality of sectors.
Claim 7
Dependent Claim
33 words
A multi-layered optical disk of Claim 5, wherein the sectors each have an identification section, which stores addresses of the recording layer, the track and the sector which the identification section belongs to.
Claim 8
Dependent Claim
19 words
A multi-layered optical disk of Claim 1, the identification sections are shifted against one another in the tracking direction.
References Cited (Backward Citations)
No citation records indexed.
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