Dual-Layer Optical Disc Block Recording for Finalize Time Reduction
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Solution Overview
Problem
In dual-layer optical discs, the finalize process is time-consuming due to the need to record dummy data in the second layer after the first layer is fully recorded, leading to inefficiencies in data recording and reproduction.
Innovation Solution
The implementation of an information recording medium and apparatus that record data in block areas spanning both recording layers, allowing for uniform data distribution and eliminating the need for dummy data in the finalize process by controlling the recording device to manage data across partial areas of both layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If data is recorded in the entire L0 layer before recording into the L1 layer, then the recording process follows a conventional sequential approach, but the finalize process takes more time due to the need to record dummy data in the L1 layer
Solution Approach 1:
The patent divides the recording area into multiple block areas, where each block area includes a partial recording area of the L0 layer and a corresponding partial recording area of the L1 layer. This segmentation allows data to be recorded in both layers simultaneously within each block, eliminating the need to record dummy data in the L1 layer after completing the L0 layer, thereby reducing finalize process time.
Solution Approach 2:
The patent transitions from a sequential recording approach (completing L0 layer entirely before L1 layer) to a parallel recording approach by organizing data into block areas that span both layers. This dimensional reorganization allows simultaneous recording operations in both layers, improving productivity and reducing the time loss during finalization.
2Adaptability or versatility
If dummy data is recorded in the L1 layer to enable reproduction on existing CD-ROM players, then compatibility is achieved, but the recording time increases proportionally to the disc size
Solution Approach 1:
By segmenting the disc into block areas with corresponding partial regions in L0 and L1 layers, the patent enables compatibility with existing CD-ROM players while avoiding the need to record dummy data across the entire L1 layer. The segmented structure allows efficient use of recording space, improving productivity without sacrificing adaptability.
3Ease of operation
If data is recorded sequentially in L0 layer then L1 layer, then the recording process is simple to manage, but the finalize process becomes inefficient and time-consuming
Solution Approach 1:
The patent maintains ease of operation by organizing the dual-layer structure into manageable block areas, where each block contains corresponding partial regions of L0 and L1 layers. This segmentation enables systematic recording control while eliminating the time-consuming dummy data recording step, thus reducing finalize process duration without complicating the recording process.
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 reduces the time required for the finalize process, enhances recording efficiency, and ensures proper data reproduction by uniformly distributing data across both layers, thereby improving user comfort and reducing recording time.
Implementation Method 1
by focusing (or irradiating) the laser light for recording on the L0 layer
Implementation Method 2
it has a semi-transparent reflective film located on the rear side of the first recording layer
Data Source
AI summary
An information recording medium (100) is provided with: a first recording layer (L0 layer) and a second recording layer (L1 layer) in each of which record information can be recorded, the information recording medium includes a plurality of block areas, each of which is a unit of recording the record information and each of which includes a partial recording area of the first recording layer (105a) and a partial recording area of the second recording layer (115a) located in a position facing the partial recording area of the first recording layer.