Optical Recording Medium with Dielectric Layer for Thermal Management
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Solution Overview
Problem
Current optical information recording media with TeOx thin-films are limited by irreversible recording, low speed, and susceptibility to thermal damage, which affects signal quality and storage reliability, especially under high-temperature and high-humidity conditions.
Innovation Solution
An optical information recording medium is designed with a multilayer structure comprising a recording layer of Te-O or other oxide base materials, a dielectric layer for heat resistance and adhesion, and a reflective layer with high thermal conductivity, along with a protective layer to enhance signal quality and storage reliability through improved crystallization, heat dissipation, and optical interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If TeOx recording thin-film is used for optical information recording, then write-once recording capability is achieved, but recording speed is slow and signal saturation time is long
Solution Approach 1:
The patent changes the compositional parameters of the recording layer by adding Pd or Au elements to TeOx, which fundamentally alters the crystallization kinetics and enables high-speed phase change recording while maintaining write-once capability
Solution Approach 2:
The patent creates a composite recording layer combining TeOx with Pd or Au elements, where the composite structure provides both the write-once recording特性 of TeOx and the high-speed crystallization promotion of Pd/Au
2Reliability
If TeOx recording thin-film is used, then recording capability is achieved, but the medium is susceptible to thermal damage under high-temperature and high-humidity conditions
Solution Approach 1:
The patent introduces a dielectric layer as an intermediary between the recording layer and environment, which provides thermal insulation and protects the recording layer from thermal damage under high-temperature and high-humidity conditions
Solution Approach 2:
The patent modifies the thermal properties of the recording system by selecting dielectric materials with high thermal resistance, thereby changing the thermal conductivity parameter to reduce heat transfer to the recording layer
3Quantity of substance
If high-density recording is implemented, then information capacity is increased, but signal quality deteriorates due to thermal interference and noise
Solution Approach 1:
The patent converts the harmful thermal interference into a beneficial effect by using controlled laser irradiation to promote rapid crystallization of Te grains, where the thermal energy that would normally cause noise and degradation is instead harnessed to enhance recording speed and signal quality
Solution Approach 2:
The patent optimizes multiple parameters including laser power, irradiation time, and material composition to achieve high-density recording while maintaining signal quality through precise control of crystallization processes
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 medium achieves superior signal quality and high-density recording with enhanced storage reliability, maintaining a high C/N ratio and resistance to thermal damage, even under accelerated testing conditions.
Implementation Method 1
crystallization within the recording thin-film due to irradiation with laser light
Implementation Method 2
irradiating the thin-film with laser light focused to give a microscopic spot
Implementation Method 3
a reflective layer with high thermal conductivity, along with a protective layer to enhance signal quality and storage reliability through improved crystallization, heat dissipation
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
An optical information recording medium, recording/reproducing method thereof, and recording/reproducing apparatus with superior signal quality for high-density recording that has high storage reliability is provided. The optical information recording medium of the present invention has at least one information layer having a recording layer and a dielectric layer in order on a transparent substrate. The dielectric layer is comprised of greater than or equal to 50 molecule percent and less than or equal to 98 molecule percent of Zn-O, and greater than or equal to 2 molecule percent to less than or equal to 50 molecule percent of one or more compounds selected from the group consisting of Y-O, Ce-O, Nb-O, Ta-O, Cr-O and Mo-O.