Multilayer Optical Disk Recording Control via Layer Segmentation
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Solution Overview
Problem
Multilayered optical disks face challenges in managing tracks for user data and management information, leading to decreased reliability and operating efficiency due to interference between recording layers, where the state of one layer affects the other, resulting in incomplete data recording and reduced reliability.
Innovation Solution
A recording control device and method that divides sequential recording ranges on each layer of a multilayered optical disk by setting a division position a prescribed distance away from the boundary of adjacent recording ranges, ensuring data is not recorded in overlapping areas, thereby improving data recording reliability and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the recording density is improved by reducing the pitch for forming tracks or reducing the size of pits, then the storage capacity increases, but the reliability of data recording decreases due to interference between layers
Solution Approach 1:
The patent divides the sequential recording range of each recording layer into multiple sub-ranges by setting division positions. This segmentation prevents the recording operation in one layer from interfering with the recording operation in the overlapping area of another layer, thereby maintaining high storage capacity while improving recording reliability.
Solution Approach 2:
The patent introduces division positions as intermediary markers that separate the sequential recording ranges. These division positions act as mediators to prevent interference between adjacent recording layers, allowing the laser beam to accurately target specific areas without affecting overlapping regions in other layers.
2Quantity of substance
If the number of recording layers is increased to achieve larger storage capacity, then the storage capacity increases, but the reliability of data recording decreases due to interference between layers
Solution Approach 1:
The patent applies segmentation to each recording layer by dividing the sequential recording range into multiple sub-ranges. This ensures that even with multiple recording layers, the recording operations in different layers do not interfere with each other, maintaining both high storage capacity and reliable data recording.
3Ease of operation
If the sequential recording range is divided by setting the division position at the boundary of two adjacent recording ranges, then the management information can be effectively managed, but the data recording reliability decreases due to incomplete recording in overlapping areas
Solution Approach 1:
The patent applies local quality by setting division positions at specific locations within the sequential recording range rather than solely at the boundaries. This creates locally optimized recording zones that prevent interference in critical overlapping areas while maintaining effective management information 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
The solution enhances the reliability and operating efficiency of data recording on multilayered optical disks by preventing interference between layers, allowing for complete and accurate data recording across all tracks, even when one layer has finished recording.
Implementation Method 1
a recording control section which controls data recording to a recording medium by irradiating laser light to the recording medium
Data Source
AI summary
There is provided a recording control device including a recording control section which controls data recording to a recording medium by irradiating laser light to the recording medium, and a division section which divides the sequential recording range of a prescribed recording layer, near a boundary of two mutually adjacent sequential recording ranges of the recording layer on a back side of the prescribed recording layer when viewed from a laser incident surface of the recording medium, in a case where data is not recorded to an area of one of the two sequential recording ranges, by setting, as a division position in the prescribed recording layer, a position separated by only a prescribed distance, from a position identical to a position of the boundary, on the other side of the two sequential recording ranges in a direction connecting a center and outer peripheral of the recording medium.