Optical Element Light-Shielding Film Curing
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Solution Overview
Problem
Existing optical elements, such as lenses, face challenges in maintaining appearance quality under high-temperature and high-humidity environments due to deterioration of light-shielding films, where high-temperature curing for protective films compromises the light-shielding film's color tone, and low-temperature curing fails to ensure adequate solvent and water resistance.
Innovation Solution
The optical element incorporates a light-shielding film with a binder resin and colorant, and a protective film formed using an alkyd resin and melamine resin or benzoguanamine resin with iminomethylol groups, cured at temperatures between 40°C and 100°C to prevent deterioration and ensure chemical resistance, while an antireflection film is applied separately to maintain optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the protective film is fired at high temperature to ensure solvent resistance and water resistance, then the protective characteristics are maintained, but the light-shielding film deteriorates and color tone changes
Solution Approach 1:
The invention changes the curing temperature parameter from conventional high temperature (above 100°C) to low temperature (40°C or more and 100°C or less). This parameter change allows the protective film to achieve adequate solvent and water resistance without subjecting the light-shielding film to excessive thermal load that would cause color tone deterioration
Solution Approach 2:
The invention uses a composite resin system combining alkyd resin with melamine resin or benzoguanamine resin having two or more iminomethylol groups. This composite material formulation enables the protective film to achieve the required protective characteristics (solvent and water resistance) at lower curing temperatures, thereby protecting the light-shielding film from thermal deterioration
2Object-affected harmful factors
If the protective film is fired at low temperature to maintain appearance quality of the light-shielding film, then color tone is preserved, but solvent resistance and water resistance cannot be maintained
Solution Approach 1:
The invention employs a composite resin system of alkyd resin combined with melamine resin or benzoguanamine resin having two or more iminomethylol groups. This composite formulation provides the chemical resistance properties (solvent and water resistance) that would normally require high-temperature curing, but now achieves them at low temperatures (40-100°C), thus preserving the appearance quality of the light-shielding film
Solution Approach 2:
The invention successfully achieves the dual goal of maintaining appearance quality and ensuring chemical resistance by changing the curing temperature parameter to a lower range (40-100°C). The special resin composition enables the protective film to develop adequate solvent and water resistance within this lower temperature range, resolving the contradiction between appearance preservation and protective characteristic development
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 solution maintains the appearance quality and chemical resistance of the optical element, preventing color tone changes and white spots, even after prolonged use in harsh conditions, while ensuring effective solvent and water resistance.
Implementation Method 1
a film in which an alkyd resin and a melamine resin having two or more iminomethylol groups in a molecule are condensed or in which an alkyd resin and a benzoguanamine resin having two or more iminomethylol groups in a molecule are condensed
Implementation Method 2
The protective film in which the alkyd resin and the crosslinker having iminomethylol groups are condensed
Implementation Method 3
firing the paint at 40° C. or more and 100° C. or less
Data Source
AI summary
The present invention relates to an optical element including a base material, a light-shielding film, and a cured film in which an alkyd resin and a melamine resin having two or more iminomethylol groups in a molecule are condensed or in which an alkyd resin and a benzoguanamine resin having two or more iminomethylol groups in a molecule are condensed. The light-shielding film is disposed in at least a part of the periphery of the base material. The cured film is disposed on the surface of the light-shielding film.