Multilayer Optical Disc Border Zone Management
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Solution Overview
Problem
In multilayer optical discs, the existing border zone structure from single-layer discs leads to compatibility issues between recording and playback devices, as it is difficult to read data from one layer while writing to another, and additional recording processes are hindered, resulting in wasted recording area and long processing times.
Innovation Solution
An information recording apparatus and method that uses a writing device to bridge record information across layers, with border control devices writing specific border information in overlapping areas to ensure compatibility and prevent unrecorded areas from interfering with recorded data, allowing for additional recording without wasting space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a border zone is recorded after user data area in single-layer optical discs to maintain compatibility, then compatibility between players and recorders is improved, but recording area is wasted and processing time increases
Solution Approach 1:
The patent transitions from single-layer to multilayer optical disc structure, utilizing the vertical dimension (multiple layers) to store border zone information. Instead of wasting radial space on a single layer, the border zone is recorded on different layers (e.g., L0 layer for user data, L1 layer for border zone), eliminating the need for additional radial recording space and reducing processing time while maintaining compatibility.
2Adaptability or versatility
If a border zone is recorded after user data area in single-layer optical discs, then compatibility between players and recorders is improved, but recording area is wasted
Solution Approach 1:
The patent utilizes the multilayer structure to place border zone information on a different layer (L1) than user data (L0), effectively using the vertical dimension to resolve the space conflict. This allows the border zone to coexist with user data without consuming additional radial recording area on the same layer.
Solution Approach 2:
The patent merges the border zone recording with the multilayer structure itself, combining the functions of data storage and border zone placement into the layered architecture. The border zone becomes an integral part of the multilayer disc structure rather than an add-on that consumes extra space.
3Productivity
If laser light is focused onto L0 layer first then L1 layer in multilayer optical discs, then recording is performed in order, but it is difficult to read data from one layer while writing to another
Solution Approach 1:
The patent segments the optical disc into multiple independent layers (L0, L1, etc.), each capable of being accessed independently. The laser focusing mechanism can selectively focus on any layer without requiring sequential access, allowing flexible reading from one layer while writing to another. This segmentation enables parallel operations on different layers.
Solution Approach 2:
The patent implements dynamic layer selection capability where the laser focusing position can be rapidly adjusted between layers. The system can dynamically switch which layer is active for reading or writing operations, enabling flexible access patterns rather than fixed sequential access. This dynamic control allows the recorder to read from L0 while writing to L1 or perform other cross-layer operations.
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
Enables efficient additional recording on multilayer optical discs without wasting space, ensuring compatibility with playback devices and reducing processing time, as the border information effectively prevents data loss and maintains recording area integrity.
Implementation Method 1
laser light for recording is focused onto a recording layer located on the front or the closest side (referred to as an 'L0 layer', as occasion demands, in the application), as viewed from a laser light irradiation or emission side, to thereby record the information into the L0 layer in a rewritable method or irreversible change recording method by heat or the like
Data Source
AI summary
An information recording device can record a plurality of pieces of recording information, for instance, at different times, in an information recording medium provided by stacking first and second recording layers. A writing control element controls a writing element so that each piece of the information can be written over the first recording layer to the second recording layer. Furthermore, a boundary control member controls the writing element so that first boundary information is written in a recording area which is to be a boundary between the pieces of information in the first recording layer, and that second boundary information is written or ensured, in a recording area of a second recording layer which overlaps the recording area wherein the first boundary information of the first recording layer is written, as a recording area to be a boundary between the pieces of information in the second recording layer.