EP0081138A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Optical recording and reproducing disc
Assignee: Panasonic Holdings Corp
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Filing: 1982-11-24
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Granted: —
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Expires: 2002-11-24
Abstract
Abstract The disclosure is directed to an optical recording and reproducing disc in which each track circumference of guide tracks formed into a concentric or spiral configuration is divided into a plurality of sectors for selective recording and reproduction of information in any desired sectors. Sector separating zones of predetermined configuration are provided at starting portions of the respective sectors, while predetermined sector marks indicating the sector separating zones are formed on an index track provided at an outer or inner periphery of the disc in positions corresponding to the sector separating zones so that. during selection of the sectors at the recording and reproduction, reproduction signal by the sector marks are used for selection of the sectors, while starting of the recording and reproduction is effected by the reproduced information of the sector separating zones.
Inventors
- 👤 Isao Satoh
- 👤 Tomio Yoshida
- 👤 Shunji Ohara
- 👤 Kenji Koishi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 19:59
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/2407; G11B7/24085; G11B27/00; G11B27/10; G11B27/19; G11B27/28; G11B27/32; G11B7/007; G11B7/00745; G11B7/08; G11B7/085; G11B7/08505; G11B7/08517; G11B2220/00; G11B2220/20; G11B27/24; G11B27/30; G11B27/3027
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
114 words
An optical recording and reproducing disc having guide tracks formed thereon for optically recording and reproducing information, which comprises a plurality of track address recording zones, data track section including sectors capable of recording a plurality of information and sector separating zones for separating said sectors from each other, and index track section provided at an outer portion or inner portion of said data track section, said track address recording zones, said data track section and said index track section being provided on said guide tracks, said index track section further including index marks for indicating positions of said track address recording zones and sector marks for indicating positions of said sector separating zones.
Claim 2
Dependent Claim
114 words
An optical recording and reproducing disc having guide tracks formed thereon for optically recording and reproducing information, which comprises a plurality of track address recording zones, data track section including sectors capable of recording a plurality of information and sector separating zones for separating said sectors from each other, and index track section provided at an outer portion or inner portion of said data track section, said track address recording zones, said data track section and said index track section being provided on said guide tracks, said index track section further including index marks for indicating positions of said track address recording zones and sector marks for indicating positions of said sector separating zones.
Claim 3
Dependent Claim
70 words
An optical recording and reproducing disc as claimed in Claim 1, wherein said track address recording zones are provided in two positions corresponding to each other, with a center of said optical recording and reproducing disc positioned therebetween for recording the same track address information thereon, said index marks which respectively have different phase constructions being provided in positions corresponding to the positions of said two track address recording zones.
Claim 4
Dependent Claim
53 words
An optical recording and reproducing disc as claimed in Claim 2, wherein the address information of said two track address recording zones is arranged to be renewed at the position of either one of said two index marks so as to impart specific values to each data track of said data track section.
Claim 5
Dependent Claim
26 words
An optical recording and reproducing disc as claimed in Claim 1, further including flat portion provided between said data track section and said index track section.
Claim 6
Dependent Claim
49 words
An optical recording and reproducing disc as claimed in Claim 1, wherein the guide tracks for said data track section are formed into a spiral configuration, at least one of said sectors neighboring said track address recording zone being arranged to be longer than the remaining plurality of sectors.
Claim 7
Dependent Claim
27 words
An optical recording and reproducing disc as claimed in Claim 1, wherein said index marks and said sector marks are formed by groups of guide track pieces.
Claim 8
Dependent Claim
57 words
An optical recording and reproducing disc as claimed in Claim 1, wherein said sector separating zones are each constituted by repetition of rows of concave and convex pits having a pitch smaller than that of said guide tracks and guide track pieces having a length approximately equal to that of said raws of concave and convex pits.
References Cited (Backward Citations)
No citation records indexed.
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