Multilayer Optical Disc Dual Recording Layer Numbering
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Solution Overview
Problem
Conventional optical discs with multiple recording layers face challenges in accurately specifying recording layers due to the presence of multiple logical addresses and recording formats, leading to difficulties in data recording and reproduction, especially when layer jumps are required.
Innovation Solution
The implementation of an optical disc with multiple recording layers, each having a unique first recording layer number for physical positioning and a second recording layer number corresponding to a specific recording format, both included in the address area, allows for precise specification and recording of data across different formats.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple recording formats are used in a multilayer optical disc, then the versatility and capacity of the disc are improved, but the complexity of specifying and detecting recording layers increases
Solution Approach 1:
The patent segments the layer numbering system into two distinct parts: a first layer number that provides absolute physical positioning across all recording layers, and a second layer number that provides relative positioning within each recording format. This segmentation allows the system to handle multiple recording formats independently while maintaining a unified physical structure, thereby resolving the contradiction between versatility and complexity.
Solution Approach 2:
The patent introduces a dual-dimensional layer numbering system where the first layer number operates in the physical dimension (absolute position from the start surface) and the second layer number operates in the logical dimension (relative position within each format). This dimensional separation enables the system to accommodate multiple recording formats without increasing the complexity of layer specification, as each dimension serves a specific purpose.
2Device complexity
If a single logical address structure is used across all recording layers, then the simplicity of address management is improved, but the ability to support multiple recording formats is reduced
Solution Approach 1:
The patent creates a universal address management system that can handle multiple recording formats through the dual layer numbering mechanism. The first layer number provides a universal reference that works across all formats, while the second layer number adapts to the specific requirements of each format. This universal yet adaptable approach allows a single logical address structure to support multiple recording formats without sacrificing simplicity.
3Ease of operation
If layer numbers are assigned sequentially from the start surface, then the ease of physical positioning is improved, but the accuracy of format-specific layer identification is reduced
Solution Approach 1:
The patent segments the layer identification function into two separate numbering systems: the first layer number handles physical positioning from the start surface with simple sequential assignment, while the second layer number handles format-specific identification with assignment relative to each format's start surface. This segmentation allows each numbering system to excel at its specific function without compromising the other.
Solution Approach 2:
The patent applies local quality by making the second layer number format-specific, where each recording format has its own reference point (start surface) for numbering. This allows the layer identification system to be locally optimized for each format's requirements while maintaining global consistency through the first layer number system.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enables accurate and efficient data recording and reproduction by allowing for absolute and relative specification of recording layers, facilitating layer jumps and maintaining data integrity across various recording formats.
Implementation Method 1
an optical pickup head 220 for irradiating a recording layer 110 to 140 with laser light LB
Implementation Method 2
detects a data recording position or reproduction position with reference to the sector number assigned in each data area
Data Source
AI summary
An information recording medium (100) of the present invention has a plurality of recording layers (110, 120, 130, and 140) for recording therein data. Each of the plurality of recording layers corresponds to one of a plurality of recording formats. A first recording layer number (SLN) assigned with each of the recording layers in accordance with a disposed position of each of the recording layer and a second recording layer number (LLN) assigned with corresponding recording format are included in the address area (14) for the data, with respect to each of the plurality of recording layer.