Two-Stage Write Strategy Optimization for Optical Discs

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Solution Overview

Problem

Conventional optical disk recorders face challenges in achieving reliable recording quality due to manufacturing variations between disks and recorders, requiring excessive storage space and human effort to adjust write strategies for various disk types, and are limited in supporting new types, leading to impracticality.

Innovation Solution

A two-stage adjustment method for optimizing write strategy parameters, involving static and dynamic parameter optimization procedures to adjust laser power and heat interference, using a write parameter adjustment controller to refine write strategies for improved mark formation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If conventional OPC procedure is used to determine optimal power level, then laser power can be calibrated, but manufacturing variations cause marks to not be recorded well and recording quality becomes unreliable

Engineering Contradiction:

Improvelaser power calibration precisionVSAvoidrecording quality reliability

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The patent applies dynamics by making the write strategy parameters adjustable and adaptive rather than fixed. The system dynamically adjusts write strategy parameters based on actual recording results and feedback, allowing the recorder to adapt to manufacturing variations in different optical disks and maintain reliable recording quality across varying conditions

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent implements feedback mechanisms where the system monitors recording quality and uses this information to adjust write strategy parameters. By continuously feedbacking on the recording results and modifying parameters accordingly, the system overcomes the unreliability caused by manufacturing variations while maintaining precise laser power calibration

Inventive Principle:

Principle #23Feedback

2Adaptability or versatility

If multiple write strategies are stored for various optical disks, then support for different disk types is improved, but storage space consumption and human effort increase significantly

Engineering Contradiction:

Improveoptical disk type supportVSAvoidstorage space and human effort

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent segments the write strategy parameters into different categories (laser power parameters, pulse width parameters, pulse shape parameters) that can be independently adjusted. This segmentation allows the system to handle different disk types by adjusting specific parameter groups rather than storing completely separate strategies for each disk type, reducing storage requirements and complexity

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent uses parameter changes to adapt to different optical disk types. Instead of storing multiple complete write strategies, the system stores base parameters and adjusts them through parameter modification based on disk type characteristics and manufacturing variations, significantly reducing storage space and human effort while maintaining versatility

Inventive Principle:

Principle #35Parameter changes

3Adaptability or versatility

If fixed storage space is allocated for write strategies, then device structure is simplified, but new types of optical disks cannot be supported

Engineering Contradiction:

Improvenew disk type supportVSAvoidstorage space

Core Design Contradiction:

Adaptability or versatilityVSVolume of stationary object

Solution Approach 1:

The patent applies dynamics by implementing an adaptive parameter adjustment mechanism that can handle new disk types without requiring pre-allocated storage for every possible disk type. The system dynamically adjusts write strategy parameters based on actual disk characteristics, enabling support for new disk types while maintaining fixed or limited storage space allocation

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS7778132B2System and method for optimizing write strategy parameters using two-stage adjustment

Publication Date: 2010.08.17 MEDIATEK INC

AI summary

A method for optimizing write parameters using two-stage adjustment is provided. A first kind of write strategy parameters optimization procedure for adjusting at least one static write strategy parameter of a write strategy is performed. A second kind of write strategy parameters optimization procedure for adjusting at least one dynamic write strategy parameter of the write strategy is performed after performing the first kind of write strategy parameters optimization procedure. The static write strategy parameter corresponds to a signal length of a pit on an optical disk and the dynamic write strategy parameter is utilized to overcome heat interference when forming the pit.