Optical Disk Dedicated Area Allocation for OPC Optimization
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Solution Overview
Problem
Conventional optical disks with multiple recording layers face challenges in allocating an optimum power test zone and other dedicated areas in the outer circumferential area, which affects recording characteristics and increases manufacturing costs, as the fixed allocation limits flexibility and compatibility with different recording layers.
Innovation Solution
The optical disk design allows for a dedicated area to be selectively allocated in the outer circumferential area, with flexible allocation of data and middle areas, and fixed dedicated areas, enabling flexible data recording directions and buffer areas to accommodate varying recording layer characteristics, thereby optimizing recording conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the optimum power test zone is allocated at a fixed location in the outer circumferential area, then the OPC function can be performed, but the recording characteristics deteriorate and flexibility is reduced
Solution Approach 1:
The patent makes the allocation of the optimum power test zone dynamic rather than fixed. The test zone can be selectively allocated to different locations (first outer area or second outer area) depending on which recording layer is being used, allowing the system to adapt to different recording conditions and maintain optimal recording characteristics
Solution Approach 2:
The patent applies different allocation strategies to different recording layers. When the first recording layer is used, the test zone is allocated in the first outer area; when the second recording layer is used, it is allocated in the second outer area. This localized quality approach ensures optimal recording characteristics for each layer
2Reliability
If a pre-recorded zone is allocated in the first recording layer to enable test data recording in the second recording layer, then the OPC function is improved, but the manufacturing cost increases
Solution Approach 1:
The patent extracts the pre-recorded zone requirement from the first recording layer by allocating the optimum power test zone directly in the second outer area when the second recording layer is used. This eliminates the need for a separate pre-recorded zone in the first layer, reducing manufacturing complexity and cost while maintaining OPC functionality
3Adaptability or versatility
If diverse layouts are required to allocate the optimum power test zone in the outer circumferential area, then the adaptability to different recording layers is improved, but the device complexity increases
Solution Approach 1:
The patent creates a universal allocation mechanism where the same optical disk structure can serve multiple recording layers with different OPC requirements. By defining both a first outer area and a second outer area that can independently function as test zones, the system achieves multi-functionality without requiring complex different layouts for different layers
Data Source
AI summary
An information storage medium, and a recording/reproducing apparatus and method, the information storage medium including a plurality of recording layers, each layer including a lead-in area or a lead-out area, a data area, a middle area, and a dedicated area, wherein the data area is flexibly allocated according to data capacity to be recorded in each of the recording layers, the middle area is allocated behind the data area, and the dedicated area is allocated behind the middle area. The dedicated area for a special purpose may selectively be allocated in an outer circumferential area of the information storage medium, i.e., an optical disk including a plurality of recording layers. In particular, optical disks in various formats are provided in which dedicated areas for special purposes can selectively be allocated in outer circumferential areas of the optical disks depending on recording characteristics of the optical disks and the outer circumferential areas.