Optical Disc Multi-Layer Test Write Zone Arrangement
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Solution Overview
Problem
Current optical disc technologies lack a comprehensive solution for determining appropriate writing conditions for optical discs with three or more information storage layers, particularly in terms of test write zone arrangement and recording power optimization.
Innovation Solution
The optical disc design incorporates multiple information storage layers with non-overlapping test write zones at different radial locations, allowing for independent determination of recording power for each layer, even under varying thermal environments, using test write zones to ensure optimal writing conditions across all layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple information storage layers are stacked to increase storage capacity, then storage capacity is improved, but determining appropriate recording power for each layer becomes more difficult
Solution Approach 1:
The patent divides the optical disc into multiple independent information storage layers, each with its own test write zone. This segmentation allows the recording power to be determined independently for each layer by using the test write zone specific to that layer, thereby solving the difficulty of determining recording power when multiple layers are stacked.
Solution Approach 2:
The patent incorporates test write zones in advance during the manufacturing process. These pre-provided test write zones enable the recording power to be determined before actual data writing occurs, allowing optimization of writing conditions for each layer without requiring trial-and-error during data writing operations.
2Manufacturing precision
If test write zones are provided for each information storage layer, then recording power can be optimized for each layer, but the structure and arrangement of these zones becomes more complex
Solution Approach 1:
The patent arranges test write zones at different radial positions corresponding to different information storage layers. By utilizing the radial dimension of the optical disc, the patent can provide separate test write zones for each layer without significant structural complexity, as the zones are distributed across the disc surface rather than concentrated in one location.
3Quantity of substance
If information is written on deeper information storage layers, then storage capacity is increased, but the writing operation becomes more difficult due to thermal environment differences
Solution Approach 1:
The patent provides separate test write zones for each information storage layer, allowing the recording power to be determined under the specific thermal environment of each layer. This local quality approach enables optimization of writing conditions for each layer individually, making writing operations on deeper layers as easy as those on upper layers.
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 enables reliable and efficient writing operations on multiple layers by ensuring that each layer can be written with the best recording power, minimizing interference and maintaining data integrity across the disc.
Implementation Method 1
information can be written by being irradiated with a laser beam
Implementation Method 2
information can be written by being irradiating with light that has been modulated so as to represent the information to write
Implementation Method 3
a test write operation can still be performed on the target information storage layer using its test write zone under the operating environment of that layer
Implementation Method 4
even if those information storage layers are irradiated with a laser beam at mutually different intensities or in respectively different thermal environments
Data Source
Figure 1
Figure 2~3
Figure 4(a)~4(c)
AI summary
An information storage medium according to the present invention has n information storage layers (where n is an integer and n≧3), on which data can be written with a laser beam and which are stacked one upon the other. Each of the n storage layers has a test write zone for determining the recording power of the laser beam. When those n layers are counted from the one that is located most distant from the surface of the medium on which the laser beam is incident, there is a bigger radial location difference between the outer peripheral end of the inner one of the test write zones of ith and (i+1)th information storage layers (where i is an integer that satisfies 2≦i≦n-1) and the inner peripheral end of the other outer test write zone than between the outer peripheral end of the inner one of the test write zones of jth and (j+1)th information storage layers (where j is an integer that satisfies 1≦j≦i-1) and the inner peripheral end of the other outer test write zone.