Resin Composition for Optical Pickup Stabilizing Blue-Violet Laser
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Solution Overview
Problem
Current resin compositions for optical pickup devices using blue-violet laser light sources suffer from deteriorated optical properties, including reduced light transmittance and increased birefringence, which affect the device's performance and longevity, especially when exposed to high temperatures and high-speed operations.
Innovation Solution
A resin composition incorporating a polymer with an alicyclic structure and a specific hindered amine compound, which maintains moldability, low birefringence, heat resistance, and mechanical strength, while minimizing light transmittance degradation under blue-violet laser exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional resin compositions are used in optical pickup devices with blue-violet laser sources, then the device can operate initially, but the light transmittance deteriorates and birefringence increases during high-temperature, high-speed operation
Solution Approach 1:
The patent modifies the chemical composition parameters of the resin by incorporating specific hindered amine compounds (0.01-10 wt%) and phosphorus-containing compounds (0.01-5 wt%) into the polymer matrix. This compositional parameter change enables the resin to maintain stable optical properties including light transmittance and birefringence under high-temperature, high-speed operation conditions with blue-violet laser sources.
Solution Approach 2:
The patent creates a composite resin material by combining a base polymer (polycarbonate, polyacrylate, or polymethyl methacrylate) with synergistic additives: hindered amine compounds (such as N,N'-hexamethylenebis(3,5-ditert-butyl-4-hydroxyaniline)) and phosphorus-containing compounds (such as tris(2,4-di-tert-butylphenyl)phosphite). This composite structure provides both mechanical integrity and enhanced optical stability under blue-violet laser irradiation and elevated temperatures.
2Illumination intensity
If the resin composition is optimized for light transmittance, then optical performance improves, but moldability and mechanical strength may be compromised
Solution Approach 1:
The patent carefully controls the concentration parameters of additives within specific ranges: hindered amine compounds at 0.01-10 wt% and phosphorus-containing compounds at 0.01-5 wt%. This parameter optimization ensures sufficient light transmittance (maintaining >80% at 405 nm wavelength) while preserving the resin's moldability and mechanical strength required for injection molding of optical components.
3Illumination intensity
If the resin composition is optimized for light transmittance, then optical performance improves, but resistance to heat and mechanical degradation may be reduced
Solution Approach 1:
The patent employs a composite resin system where the base polymer (polycarbonate, polyacrylate, or polymethyl methacrylate) provides heat resistance and structural integrity, while hindered amine compounds provide UV/blue-violet laser stabilization and phosphorus-containing compounds provide thermal and oxidative stability. This composite architecture simultaneously achieves high light transmittance (>80% at 405 nm) and heat resistance (maintaining mechanical properties at elevated temperatures during operation).
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 resin composition effectively stabilizes optical properties, ensuring high accuracy and prolonged performance of optical components in optical pickup devices, even under challenging conditions, by preventing the deterioration of light transmittance and maintaining sufficient optical properties when using a blue-violet laser.
Implementation Method 1
a resin composition including: a polymer having an alicyclic structure in at least a part of repeating structural unit; and a hindered amine compound
Implementation Method 2
maintains moldability, low birefringence, heat resistance, and mechanical strength, while minimizing light transmittance degradation under blue-violet laser exposure
Implementation Method 3
a polymer having an alicyclic structure in at least a part of repeating structural unit; maintains moldability, low birefringence, heat resistance
Implementation Method 4
maintains moldability, low birefringence, heat resistance, and mechanical strength, while minimizing light transmittance degradation
Data Source
AI summary
There are provided a resin composition that is suitable for an optical component which, while maintaining moldability, low birefringence, heat resistance, mass productivity, mechanical strength, and light transmittance, hardly exhibits a low light transmittance during the use of a blue-violet laser beam source and a deterioration in optical properties, and an optical component produced by molding the resin composition, and a optical pickup device using the optical component. The present invention provides a resin composition comprising 0.05 to 5 parts by weight of the specific hindered amine compound based on 100 parts by weight of the polymer having an alicyclic structure in at least a part of repeating structural unit, an optical component produced by molding the resin composition, and a optical pickup device using the optical component.