Optical Drive Speed Control for Servo Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Optical disks and optical disk drive devices experience deterioration over time, leading to issues with signal quality and recording performance, causing failures in data recording and playback operations due to factors like temporal deterioration of recording films, dust adherence, and internal mechanism degradation.
Innovation Solution
An information recording and playback device that diagnoses failures by dividing the optical disk into inner and outer recording areas based on a predetermined radius, managing recording speeds, and using servo control residuals to optimize data access and playback, thereby preventing failures and maintaining recording and playback quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If data is recorded or played back at high speed in the outer circumference area of the optical disk, then productivity is improved, but reliability deteriorates due to increased control residuals from manufacturing variations causing focus and tracking errors
Solution Approach 1:
The optical disk recording area is segmented into a first recording area (inner circumference) and a second recording area (outer circumference) based on a predetermined radius. The controller manages these areas differently, allowing high-speed operation in the first area while maintaining reliable servo control in the second area by adjusting operational parameters.
Solution Approach 2:
The controller dynamically adjusts the recording and playback speed based on the current position on the optical disk. When operating in the second recording area (outer circumference), the controller reduces the speed to a lower value compared to the first recording area, adapting the operational parameters to maintain servo control accuracy despite manufacturing variations.
2Duration of action of stationary object
If the optical disk is used for extended periods, then loss of time for data storage is reduced, but reliability deteriorates due to temporal deterioration of recording films and internal mechanism degradation
Solution Approach 1:
The controller performs preliminary diagnostics by detecting control residuals during servo control operations before actual data recording or playback. By identifying areas with excessive control residuals in advance, the controller can prevent failures by avoiding these problematic areas or adjusting operational parameters, thereby maintaining reliability over extended usage periods.
Solution Approach 2:
The system implements feedback through continuous monitoring of control residuals during servo control. The controller uses this feedback information to detect deterioration trends and adjust operational parameters accordingly, preventing failures caused by temporal deterioration of recording films and internal mechanisms.
3Reliability
If servo control is performed with high precision requirements, then reliability is improved, but device complexity increases due to additional control mechanisms and parameters
Solution Approach 1:
The controller adjusts operational parameters (recording/playback speed) based on the recording area and detected control residual levels. By changing speed parameters dynamically, the system maintains reliable servo control without requiring complex additional hardware, using parameter adjustment instead of structural complexity.
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
The solution effectively determines the cause of failures between the optical disk and the drive, optimizing recording and playback speeds to prevent data access failures, enhancing reliability and maintaining high-speed data access while ensuring recording and playback quality.
Implementation Method 1
a pickup which performs irradiation with laser light, and includes a recording and playback unit which records or plays back the data by irradiating the optical disk with laser light
Data Source
AI summary
An information recording and playback device includes a recording and playback unit, and a controller. The controller divides a recording area of an optical disk into a first recording area which is at an inner circumference side, and a second recording area which is at an outer circumference side. The controller controls the recording and playback unit such that the unit records or plays back data in the first recording area at a first speed, and records or plays back data in the second recording area at a second speed slower than the first speed. The predetermined radius is set to a boundary between an area in which a control residual exceeds a predetermined reference value when servo control related to focusing and tracking is performed on the recording area of the optical disk, and an area in which the control residual does not exceed the predetermined reference value.