Dual-Layer Optical Disc Recording Control via Laser Power Adjustment
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Solution Overview
Problem
In dual-layer optical discs, the recording status of the first layer (L0) affects the laser light conditions for the second layer (L1), leading to inconsistent data recording due to potential eccentricity between the layers, causing issues with proper data recording on the L1 layer.
Innovation Solution
An information recording apparatus with a controlling device that adjusts the laser light irradiation to target areas on the second recording layer based on the recorded status of the first layer, optimizing recording power and eliminating the need to change laser light conditions, thereby ensuring consistent data recording across the second layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If laser light is irradiated through the L0 layer to record data into the L1 layer, then data can be recorded into the second recording layer, but the recording status of the L0 layer varies causing inconsistent laser light conditions and improper data recording in the L1 layer
Solution Approach 1:
The patent applies preliminary action by determining the recording status of the L0 layer before recording into the L1 layer. The controlling device checks whether data has been recorded in the L0 layer at the corresponding position, and based on this preliminary determination, adjusts the laser light irradiation conditions for the L1 layer recording process, ensuring consistent and proper data recording.
2Ease of manufacture
If the L0 layer and L1 layer are separately formed and bonded together to produce the dual-layer type optical disc, then the optical disc can be produced at low cost, but eccentricity occurs between the layers causing data recording issues
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the laser light irradiation parameters (such as power, pulse width, or wavelength) based on the detected recording status of the L0 layer. This compensation for eccentricity through parameter adjustment allows maintaining data recording precision despite the layer misalignment caused by the bonding process.
3Adaptability or versatility
If the recording status of the L0 layer is not standardized, then flexibility in recording methods is maintained, but the conditions for laser light irradiation onto the L1 layer change, preventing proper data recording
Solution Approach 1:
The patent implements feedback by detecting the recording status of the L0 layer and using this information to control the laser light irradiation conditions for recording into the L1 layer. The controlling device receives feedback about the L0 layer state and adjusts the recording parameters accordingly, ensuring precise data recording in the L1 layer regardless of the L0 layer's recording status.
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 solution allows for proper data recording throughout almost the entire surface of the second layer without varying laser light conditions, improving recording features and reducing processing costs by eliminating the need to account for the recording status of the first layer.
Implementation Method 1
the information is recorded into the L0 layer in a rewritable method or irreversible change recording method such as irreversible change recording heat by using heat or the like, by focusing the laser light for recording onto the L0 layer
Implementation Method 2
by focusing the laser light for recording onto the L0 layer, and the information is recorded into the L1 layer in a rewritable method or irreversible change recording method by heat or the like, by focusing the laser light onto the L1 layer
Data Source
AI summary
An information recording apparatus (300) is for recording record information onto an information recording medium (100) comprising a first recording layer (L0 layer) and a second recording layer (L1 layer) to record therein the record information by irradiating laser light. The information recording apparatus is provided with: a recording device (352) for recording the record information into at least one of the first recording layer and the second recording layer by irradiating the laser light; and a controlling device (354) for controlling the recording device to record the record information into a target area (115a), which is a recording area of the second recording layer corresponding to a recording area (105a) of the first recording layer in which the record information is recorded, if the record information is recorded into the second recording layer.