Dual-Layer Optical Disc Calibration Area Segmentation
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Solution Overview
Problem
In dual layer type information recording media, the state of recording in one layer can vary based on the recording state of the other layer, leading to inconsistent optimum power calibration during the OPC process, affecting the accuracy of recording operations.
Innovation Solution
The implementation of a multilayer information recording medium with separate calibration areas for each recording layer, where test information is recorded in specific positions to ensure that one layer's recording state does not influence the other, using space areas to maintain optimal calibration regardless of the recording state of the opposing layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If each recording layer is provided with a PCA area for OPC process, then power calibration can be performed for both layers, but the recording state of one layer varies depending on the recording state of the other layer, causing inconsistent calibration results
Solution Approach 1:
The patent divides the calibration area into two distinct segments: a first calibration area dedicated to L0 layer testing and a second calibration area dedicated to L1 layer testing. This segmentation ensures that each layer can be calibrated independently without interference from the other layer's recording state, resolving the contradiction between performing calibration for both layers and maintaining calibration consistency.
Solution Approach 2:
The patent applies local quality by creating separate calibration regions with specific functional characteristics. The first calibration area is optimized for L0 layer power calibration while the second calibration area is optimized for L1 layer power calibration. Each area has localized recording characteristics that match its corresponding layer, ensuring accurate and consistent calibration results for each layer independently.
2Productivity
If test information is recorded in facing positions in both calibration areas, then calibration can be performed for both layers, but the recording state of one layer influences the other layer, causing variation in calibration results
Solution Approach 1:
The patent segments the calibration areas such that the first calibration area contains only L0 layer recording regions and the second calibration area contains only L1 layer recording regions. This spatial segmentation prevents cross-layer interference during calibration, allowing efficient calibration of both layers while maintaining precise control over each layer's recording state independently.
3Reliability
If a space area is introduced between recording areas in calibration zones, then test writing can be performed independently in each layer, but the calibration area structure becomes more complex
Solution Approach 1:
The patent implements segmentation by creating distinct first and second calibration areas with dedicated recording regions for each layer. The space area acts as a physical separator that prevents laser light from one layer from affecting the other layer during calibration. This segmentation achieves independent test writing capability while the structured design keeps the overall complexity manageable through clear spatial organization.
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 approach allows for consistent and efficient test writing in each recording layer, ensuring accurate power calibration and minimizing variations in recording states, thereby improving the reliability of the recording process.
Implementation Method 1
by focusing the laser light for recording on the L0 layer
Implementation Method 2
in a rewritable method or irreversible change recording method by using heat
Data Source
AI summary
An information recording medium (100) is provided with: a first recording layer (L0 layer) having a first calibration area (103-1) in which test information for calibrating a power of laser light in recording record information can be recorded; and a second recording layer (L1 layer) having a second calibration area (103-2) in which the test information can be recorded and in which at least one portion of a recording area faces the first calibration area, wherein the first calibration area and the second calibration area including a space area (103U-1, 103U-2) having a predetermined size in positions facing each other, the test information is recorded in a recording area (103R-1) located on one side, centered on the space area, in the first calibration area, and the test information is recorded in a recording area (103R-2) located on other side which is opposite to the one side, centered on the space area, in the second calibration area.