Optical Disc Power Adjustment Area for Multi-Layer Recording Stability
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Solution Overview
Problem
Optical discs with multiple recording layers face delays in starting information recording on lower layers due to the need to ascertain the state of upper layers, which prolongs the initiation of stable recording.
Innovation Solution
Incorporating power adjustment areas in both recording layers, with a prewrite area in the first layer that includes a restricted area adjacent to the power adjustment area of the second layer, allowing for optimal recording power adjustment before recording on the second layer, thus enabling immediate and stable data recording.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the recording state of the upper layer is checked before recording on the lower layer, then stable recording conditions are ensured, but the start of information recording is delayed
Solution Approach 1:
The patent performs power adjustment and test recording on the upper layer before recording information on the lower layer. By completing these preliminary actions in advance, the system ensures stable recording conditions are established while minimizing the delay before actual information recording can begin on the lower layer.
Solution Approach 2:
The patent divides the recording process into distinct segments: power adjustment phase, test recording phase, and information recording phase. This segmentation allows each phase to be optimized independently, ensuring that power adjustment and testing are completed efficiently before transitioning to the information recording phase on the lower layer.
2Manufacturing precision
If a prewrite area is created in the first layer corresponding to the power adjustment area in the second layer, then optimal recording power can be adjusted before recording on the second layer, but the structure complexity increases
Solution Approach 1:
The patent implements a nested structure where the prewrite area in the first layer corresponds spatially to the power adjustment area in the second layer. This nesting allows the system to perform power adjustment operations on the second layer while utilizing the corresponding area in the first layer, enabling precise power optimization without adding significant structural complexity.
Solution Approach 2:
The prewrite area in the first layer serves as an intermediary structure that facilitates power adjustment for the second layer. By creating this corresponding area in the first layer, the system can perform necessary power calibration and testing operations without directly complicating the second layer's structure, thus achieving precise power adjustment with minimal added complexity.
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 ensures stable recording conditions by allowing the optical disc to start recording data quickly on the second layer without being affected by the state of the first layer, reducing the impact of lamination misalignment and beam diameter effects.
Implementation Method 1
the first recording layer and the second recording layer have respective power adjustment areas that are used to adjust the power of the recording light to an optimal recording power
Data Source
AI summary
An optical disc on which information can be recorded by recording light has a first recording layer (102) and a second recording layer (103) disposed behind the first recording layer as viewed by the recording light; the first recording layer and the second recording layer have respective power adjustment areas (P1, P2) that are used to adjust the power of the recording light to the optimal recording power at the time of recording of information on each recording layer; a prewrite area (PW) is provided in correspondence to the power adjustment area (P2) used for optimal power adjustment in the second recording layer and restricted areas (A1, A2) on both sides of that power adjustment area (P2). The restricted areas (A1, A2) allow for the diameter of the recording light beam and for lamination misalignment. This configuration enables stable test recording to be carried out in a short time on an optical disc having multiple recording layers.