TeO2 Recording Layer Eutectic Reaction for High-Speed Optical Storage

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Solution Overview

Problem

Current optical information recording media face challenges in achieving high recording sensitivity and reliability, particularly for multilayer media, which are essential for increased capacities and speeds, as existing materials like Te—O—Pd do not meet the required sensitivity and reliability standards for long-term storage and high-speed recording.

Innovation Solution

The introduction of a recording medium with a recording layer containing TeO2 and a material that exhibits a eutectic reaction, such as Ag—O, Al—O, Bi—O, or other oxides, which allows for lower laser power recording and improved sensitivity, along with a manufacturing method involving sputtering to optimize the layer composition and structure.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If higher laser power is used to increase recording speed, then recording speed is improved, but thermal load on the dielectric layer increases and reliability decreases

Engineering Contradiction:

Improverecording speedVSAvoidreliability of recording medium

Core Design Contradiction:

SpeedVSReliability

Solution Approach 1:

The patent changes the chemical composition parameters of the recording layer by incorporating specific oxide materials (TeO2 with materials exhibiting eutectic reactions) to modify the thermal and optical properties, enabling high-speed recording at reduced power levels

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses composite recording layer materials combining TeO2 with other oxides that exhibit eutectic reactions, creating a material system with optimized thermal conductivity and laser absorption characteristics to reduce thermal load while maintaining recording efficiency

Inventive Principle:

Principle #40Composite materials

2Manufacturing precision

If higher laser power is used to achieve high recording sensitivity, then recording sensitivity is improved, but thermal damage to the dielectric layer increases

Engineering Contradiction:

Improverecording sensitivityVSAvoidthermal damage to dielectric layer

Core Design Contradiction:

Manufacturing precisionVSObject-affected harmful factors

Solution Approach 1:

The patent modifies the optical and thermal parameters of the recording layer through compositional changes, achieving enhanced laser absorption efficiency that improves recording sensitivity without proportionally increasing thermal damage to surrounding layers

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent utilizes the eutectic reaction characteristics of the recording layer materials to convert the potentially harmful thermal energy into a beneficial phase change mechanism that enables precise recording while limiting heat diffusion to the dielectric layer

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Quantity of substance

If multilayer structure is used to increase recording capacity, then recording capacity is improved, but recording sensitivity requirement increases due to multiple layers

Engineering Contradiction:

Improverecording capacityVSAvoidrecording sensitivity

Core Design Contradiction:

Quantity of substanceVSManufacturing precision

Solution Approach 1:

The patent applies the optimized TeO2-based recording layer material to specific layers in the multilayer structure, particularly to layers that require high sensitivity, while allowing other layers to have different compositions optimized for their specific functions

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent employs composite recording layer materials with enhanced optical and thermal properties that maintain high recording sensitivity even when multiple layers are stacked, allowing increased capacity without sacrificing sensitivity

Inventive Principle:

Principle #40Composite materials

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 results in a medium with enhanced recording sensitivity and reliability, enabling efficient data storage with reduced thermal damage and improved long-term storage capabilities, meeting the demands for higher capacities and speeds.

Implementation Method 1

the material A is a material that exhibits a eutectic reaction with TeO2

Methodology Applied

Scientific EffectEutectic reaction:

Implementation Method 2

information can be recorded and from which information can be reproduced by irradiating the recording layer with laser light

Methodology Applied

Scientific EffectLaser heating: Laser

Implementation Method 3

a manufacturing method involving sputtering to optimize the layer composition and structure

Methodology Applied

Scientific EffectSputtering: Sputtering

Data Source

PatentUS7972674B2Information recording medium, its manufacturing method, and sputtering target for forming information recording medium

Publication Date: 2011.07.05 PANASONIC HOLDINGS CORP

AI summary

A write-once information recording medium having a high recording sensitivity and reliability with respect to long-term storage is provided. The information recording medium has a recording layer on a substrate, to which information can be recorded and from which information can be reproduced by irradiating the recording layer with laser light or applying electrical energy to the recording layer. The recording layer contains, as its primary components, TeO2 and a material A, where the material A is a material that exhibits a eutectic reaction with TeO2.