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AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsShigeru Furumiya, Hiromichi Ishibashi, Takashi Ishida, Yoshiharu Kobayashi
Estimating the term…
An optical disc having marks for dispersed addresses that can be easily detected with high precision. A dispersed address comprises synchronization marks, positive marks, and negative marks. Synchronization marks, positive marks, and negative marks are formed along a groove as partial discontinuities or partial modifications in the wobbled groove.
A rewritable optical disc with a spiral or concentric track comprising:
A rewritable optical disc with a spiral or concentric track comprising:
A rewritable optical disc with a spiral or concentric track comprising:
A rewritable optical disc with a spiral or concentric track comprising:
Dependencies are inferred from the claim text.
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By using information detectable on the record carrier: by sensing features on the record carrier other than the transducing track ; sensing…
Recording, reproducing or erasing systems characterised by the shape or form of the carrier: with discs
Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the…:…
Arrangement of the information on the record carrier, e.g. form of tracks , actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped;…:…
Term end not estimated
1. Field of the Invention
The present invention relates to an optically rewritable optical disc and to an apparatus and method for reading addresses prewritten to the optical disc.
2. Description of Related Art
FIG. 1A is a plan view of an optical disc according to a preferred embodiment of the present invention, and FIG. 1B is a schematic view of a sector block;
FIG. 2A is descriptive drawing of a dispersed address recorded to the center block, and FIG. 2B is a schematic drawing of a groove in which dispersed address marks are formed;
FIG. 3 is a partially enlarged view of an optical disc having groove discontinuities according to a preferred embodiment of the invention;
The preferred embodiments of the present invention are described below with reference to the accompanying figures.
Embodiment 1
FIG. 1A is a plan view of an optical disc according to a preferred embodiment of the present invention, and FIG. 1B describes the placement of sector blocks. Shown in FIG. 1A are the optical disc substrate 101, header 102 that is preformed when the disc is made, recording area 103 where data can be recorded, and sector 104, which is the data recording unit. FIG. 1B shows a sector block 105 containing a specific number (such as 32) of sectors.