Recording Condition Classification for High-Density Optical Media
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Solution Overview
Problem
As recording density increases, inter-symbol interference and signal-to-noise ratio (SNR) deterioration become significant issues, necessitating higher order PRML systems for accurate signal reproduction, which requires precise adjustment of recording mark edges and recording conditions to minimize error rates in high-density recording.
Innovation Solution
The solution involves an information recording medium and apparatus that classify recording conditions based on the length of recording marks and adjacent spaces, using a combination of lengths to adjust recording parameters, such as leading and trailing edge positions, to optimize recording marks and spaces, even at high densities, thereby reducing error rates and ensuring stable recording/reproduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If recording density is increased, then storage capacity is improved, but inter-symbol interference and signal-to-noise ratio deterioration occur
Solution Approach 1:
The patent applies local quality by differentiating recording conditions based on the specific context of each recording mark. Instead of using uniform recording parameters, the system adjusts recording conditions according to the lengths of adjacent spaces and marks, creating locally optimized recording parameters that address thermal interference and signal quality issues in high-density recording scenarios
2Quantity of substance
If recording density is increased, then storage capacity is improved, but recording mark edge position precision deteriorates
Solution Approach 1:
The patent implements dynamics by making recording parameters adjustable and adaptive rather than fixed. The recording condition adjustment mechanism dynamically modifies recording parameters based on real-time detection of recording mark and space lengths, enabling precise control of recording mark edge positions even at high recording densities where thermal interference is significant
3Measurement precision
If higher order PRML system is used, then signal reproduction accuracy is improved, but system complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-adjusting recording conditions based on predicted thermal interference patterns. By classifying recording marks according to adjacent space and mark lengths before recording, the system proactively optimizes recording parameters to minimize thermal interference, thereby reducing the burden on complex post-processing PRML systems
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 allows for precise recording of appropriate-shaped recording marks at high precision, reducing error rates and providing a more stable recording/reproduction system, even at extreme recording densities, by considering the thermal interference effects of adjacent marks.
Implementation Method 1
A level of the recording pulse sequence, namely, a laser intensity is classified as a peak power Pp201 which provides a heating effect required for forming a recording mark
Implementation Method 2
a bottom power Pb202 having a cooling effect, a cooling power Pc203
Implementation Method 3
The analog reproduction signal is specifically generated from reflected light which is obtained by irradiating the track with a light beam
Data Source
AI summary
An information recording medium includes a track on which a data sequence is recordable, and at least one of a PIC area in which a recording condition for recording the data sequence on the track is recorded. The recording condition includes a parameter for adjusting a position of a trailing end of a cooling pulse in a recording pulse waveform for forming the recording mark. The parameter is classified using a combination of a length of the recording mark, a length of a first space located adjacently previous to the recording mark and a length of a second space located adjacently subsequent to the recording mark. A recording apparatus is provided for recording a data sequence on an information recording medium based on the recording condition recorded on the information recording medium. An evaluation apparatus is provided for evaluating an information recording medium having the recording parameter recorded thereon.