Optical disc medium and optical disc device

Abstract

Areas, which are located on the inner peripheral sides of multi-layered information recording areas and have the same radial ranges, are set as burst cutting area forming zones, and a burst cutting area (BCA) is formed in one information recording layer. All of the same radial ranges of the other information recording layers are formed as mirror surfaces. Thereby, interference from other layers and scattering of readout light are prevented, so reading of the burst cutting area (BCA) is realized stably.

Description

technical field [0001] The present invention relates to an optical disc medium and an optical disc device, and more particularly to an optical disc medium and an optical disc device provided with the arrangement of a burst cutting area (BCA) related to identification information of the optical disc medium, its detection and reproduction technology, and the like. Background technique [0002] In the field of optical discs in which information is recorded and reproduced (reading) by a tiny condensing spot, a reproduction-only ROM (read-only memory) medium in which emboss-shaped pit rows are formed in advance can only record data once. Among them, CD-R (Compact Disc Recordable) and DVD-R (Digital Versatile Disc Recordable) are widely used (refer to the following patent documents). [0003] Also, in recent years, optical discs such as rewritable DVD-RAM (Digital Versatile Rewritable Disc) are also used. These optical discs have a structure in which a focused spot is formed on a...

AI Technical Summary

Problems solved by technology

In such a small layer interval, since crosstalk cannot be ignored, if a structure such as a pit or groove is formed on an adjacent layer, it will cause noise during reproduction.

Therefore, in the usual pit recording surface, there will be a disadvantage that a sufficient amount of error correction codes cannot be added to the recording signal by taking this amount of noise into consideration.

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