Optical Disc Multi-Layer Data Region Layout
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Solution Overview
Problem
As optical disc storage capacity increases, data readability and playback can be impaired due to layout issues, leading to accessibility problems and unreliable information retrieval.
Innovation Solution
The optical disc design optimizes layer positioning to facilitate smooth data reading and playback by strategically placing switching points between layers, allowing for reliable storage and retrieval of information without requiring pickup movement, and enabling high-speed search systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple recording layers are provided to increase storage capacity, then the capacity of the optical disc is increased, but accessibility and smooth playback are impaired due to data layout issues
Solution Approach 1:
The optical disc is divided into multiple recording layers (first recording layer and second recording layer) with distinct data regions. The first recording layer contains a data region for content information and a second region, while the second recording layer contains a data region for continuation information and a third region. This segmentation allows independent optimization of each layer's data layout, improving accessibility while maintaining high storage capacity through multi-layer utilization.
Solution Approach 2:
The patent transitions from a single-layer data layout to a multi-layer three-dimensional structure. By adding the vertical dimension of multiple recording layers, the system increases storage capacity without compromising radial accessibility. The pickup can read from different layers at the same radial position, effectively adding a new dimension to data organization that resolves the contradiction between capacity and accessibility.
2Reliability
If data is recorded on the inner circumferential side to account for warping, then storage reliability is improved, but flexibility in data placement is reduced
Solution Approach 1:
The data region is segmented across multiple layers with different radial positions. The first recording layer's data region can be positioned to benefit from warping compensation, while the second recording layer's data region provides alternative placement options. This segmentation maintains reliability through strategic inner-circumferential positioning while preserving flexibility through multi-layer distribution.
Solution Approach 2:
Different regions of the optical disc are assigned different qualities and functions. The inner circumferential regions are optimized for reliability (accounting for warping), while outer regions provide flexibility for data placement. Each recording layer has locally optimized characteristics, allowing the system to achieve both reliability and adaptability simultaneously.
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 design ensures reliable and efficient reading and playback of information across multiple layers, maintaining data integrity and enabling high-speed access without compromising storage capacity.
Implementation Method 1
read of the data is performed by irradiating with a laser at a certain position on the optical disc from a pickup
Data Source
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AI summary
An optical disc according to an embodiment of the present invention comprises at least three layers of recording layers that each record information in an information track. The recording layer comprises: an inner circumferential side region positioned on the inner circumferential side; a data region which is positioned to the outer circumferential side of the inner circumferential side region and records content information; and an outer circumferential side region positioned to the outer circumferential side of the data region. The content information is recorded in the data region of the three or more layers of recording layers, and a point on an upper layer and a point on a lower layer one layer below the upper layer at which playback switches from content information of the upper layer being played back in an inner circumferential direction to content information of the lower layer, are set so as to be more to the outside than an innermost circumferential position of the data region.