Optical Disc Recorder Write Power Adjustment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional optical disc recorders fail to adjust write power during long recording sessions, leading to degraded recording quality due to temperature changes, as the initial write power is not dynamically adjusted.
Innovation Solution
A method that involves pre-setting a range for write quality parameters and power, then adjusting the power based on real-time readings of these parameters, either by incrementally adjusting power when parameters are out of range or calculating an average to determine necessary adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If write power is maintained at initial level throughout recording, then recording speed is maintained, but recording quality degrades due to temperature rise
Solution Approach 1:
The patent implements dynamic adjustment of write power during the recording process. The system continuously monitors write quality parameters and modifies write power in real-time based on accumulated temperature effects, transforming the static initial write power setting into a dynamic control mechanism that adapts to changing disc temperature conditions throughout the recording session.
Solution Approach 2:
The patent employs feedback control by reading write quality parameters during recording, comparing them against expected ranges, and using this information to adjust write power accordingly. The system accumulates quality parameter data and uses this feedback loop to compensate for temperature-induced degradation, ensuring consistent recording quality across the entire disc surface.
2Manufacturing precision
If write power is increased to compensate for temperature rise, then recording quality is maintained, but excessive power causes damage
Solution Approach 1:
The patent changes the write power parameter dynamically based on monitored write quality parameters and accumulated temperature effects. Rather than using a fixed or simply increased power level, the system adjusts power within an optimized range determined by real-time quality assessment, preventing both under-powering (quality degradation) and over-powering (disc damage).
Solution Approach 2:
The patent applies partial adjustment of write power rather than full compensation. By using quality parameter thresholds and accumulated data to determine incremental power modifications, the system applies only the necessary amount of power increase to maintain quality, avoiding excessive power application that would cause disc damage while still compensating for temperature rise.
3Manufacturing precision
If write power is adjusted frequently during recording, then recording quality is maintained, but system complexity increases
Solution Approach 1:
The patent performs preliminary setup by establishing write quality parameter ranges and power adjustment strategies before recording begins. The system pre-configures the feedback control parameters and power adjustment thresholds, allowing the actual recording process to proceed with automated adjustments based on these pre-established criteria, reducing the need for complex real-time decision-making algorithms.
Solution Approach 2:
The patent segments the recording process into manageable intervals where quality parameters are read and evaluated at specific points. Rather than continuous complex adjustments, the system divides the recording session into segments with discrete quality checks and corresponding power adjustments, simplifying the control mechanism while maintaining overall recording quality across the entire disc.
Data Source
AI summary
A method is disclosed for adjusting write power when recording an optical disc. First, pre-setting a range of a write quality parameter and a write power. Next, moving a spindle motor and an optical pickup head to a target track. After the spindle motor is stable at the intended rotation speed as well as the optical pickup head is positioned correctly at the target track, then reading a write quality parameter. Then, determining whether the write quality parameter is in the range. When the write quality parameter is in the range, then according to the write power to write data to the target track. When the write quality parameter is out of the range, then adjusting the write power to write data to the target track.