Electromagnetic Shielding Filter Blackened Mesh Antireflection
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Solution Overview
Problem
Electromagnetic wave shielding filters with optical transparency face challenges in achieving excellent antireflection properties, especially when the blackened face exhibits a wetted color due to contact with a transparent resin layer, and conventional surface roughness prescriptions are insufficient for estimating the degree of blackness.
Innovation Solution
The electromagnetic wave shielding filter features a meshed layer with a blackened face having micro-irregularities whose probability density curve is convex upward, with a peak point and a horizontal tangent, and an averaged surface roughness in the range of 0.10 to 1.00 μm, supported by a transparent base material and protected by a transparent resin layer, ensuring excellent antireflection even in a wetted state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a blackened layer is formed on the meshed layer to prevent light reflection, then the antireflection ability is improved, but the appearance changes to a wetted color when covered with a transparent resin layer
Solution Approach 1:
The patent applies local quality by creating micro-irregularities with specific probability density distribution (convex upward shape with horizontal tangent at peak) only on the blackened face surface. This localized surface modification maintains antireflection properties while the specific micro-irregularity shape ensures the surface appears black even when wetted by the transparent resin layer, thus resolving the contradiction between antireflection ability and appearance.
2Object-affected harmful factors
If the surface roughness Ra is prescribed in a range of 0.10 to 1.00 μm to enhance blackness, then the antireflection ability is improved, but the prescription is insufficient for estimating the degree of blackness when the blackened face is in a wetted state
Solution Approach 1:
The patent changes the parameter specification from simple arithmetic mean roughness Ra to a more sophisticated probability density curve characterization (convex upward shape with horizontal tangent at peak). This parameter change provides better measurement precision for estimating blackness in wetted states, as the probability density distribution captures the essential light-scattering characteristics that maintain blackness appearance even when covered by transparent resin.
3Strength
If a transparent resin layer is provided to cover the meshed layer for protection and additional optical filter functions, then the mechanical strength and protection are improved, but the blackened face exhibits a wetted color that degrades the appearance
Solution Approach 1:
The patent applies local quality by creating micro-irregularities with specific probability density distribution (convex upward shape with horizontal tangent at peak) only on the blackened face surface. This localized surface modification maintains antireflection properties while the specific micro-irregularity shape ensures the surface appears black even when wetted by the transparent resin layer, thus resolving the contradiction between antireflection ability and appearance.
4Shape
If the meshed layer is directly exposed to air, then the appearance is maintained, but the mechanical strength and protection are reduced
Solution Approach 1:
The patent applies local quality by creating micro-irregularities with specific probability density distribution (convex upward shape with horizontal tangent at peak) only on the blackened face surface. This localized surface modification maintains antireflection properties while the specific micro-irregularity shape ensures the surface appears black even when wetted by the transparent resin layer, thus resolving the contradiction between antireflection ability and appearance.
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 configuration enhances the antireflection property and mechanical strength, protecting the blackened face from corrosion while maintaining high optical transparency and blackness, even when the blackened face exhibits a wetted color, thereby improving handling and appearance.
Implementation Method 1
a blackened face having micro-irregularities is formed on at least one face of the meshed layer
Implementation Method 2
the shape of the micro-irregularities of the blackened face is adjusted to have a probability density curve in which a peak point is convex upward
Implementation Method 3
a transparent resin layer is provided to cover the meshed layer for protection and additional optical filter functions
Implementation Method 4
the meshed layer is supported by a transparent base material
Data Source
AI summary
An electromagnetic wave shielding filter 10 includes a meshed layer, wherein at least one of the front and back surfaces of the meshed layer is subjected to a blackening treatment to be a blackened face having micro-irregularities. The shape of the micro-irregularities is adjusted to have a probability density curve with a peak point being convex upward wherein the probability density curve is defined as a curve depicted in a graph in which the change of height from the peak value Rp to the bottom value Rv of the deepest valley is shown as the horizontal axis while the probability density expressing the distribution of height is shown as the vertical axis. Also, in the probability density curve, a horizontal tangent can be drawn at its peak point.