Transparent Conductive Mesh Layout for Stable Heating and EM Selectivity
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Solution Overview
Problem
Existing technologies face challenges in simultaneously achieving heat generation and allowing transmission of only an electromagnetic wave in a specific frequency band, while also preventing local deterioration during heat generation and ensuring improved shielding properties in an opaque state of a light control device.
Innovation Solution
A transparent conductive film with a mesh-shaped portion formed of conductive wirings, featuring non-conductive portions arranged in a regular pattern with extension portions and projection portions, optimized to allow transmission of electromagnetic waves in a specific frequency band while preventing local current concentration and deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metal mesh with cross-shaped non-conductive portions is used to allow transmission of electromagnetic waves in a specific frequency band, then electromagnetic wave transmission is improved, but current concentrates through the non-conductive portions causing local heat generation and deterioration
Solution Approach 1:
The patent changes the symmetric cross-shaped non-conductive portions to asymmetric rounded rectangular shapes with different side lengths. This asymmetry prevents current from concentrating at specific points, distributing the current flow more evenly across the conductive wiring mesh while maintaining electromagnetic wave transmission properties.
Solution Approach 2:
Instead of trying to prevent current flow through the mesh structure, the patent inverts the approach by designing the non-conductive portions to guide and distribute current flow in a controlled manner. The rounded rectangular shape with extended sides creates natural current distribution paths that avoid local concentration points.
2Object-affected harmful factors
If the gap between non-conductive portions is widened to avoid current concentration, then local deterioration is reduced, but the transmittance of electromagnetic waves in the specific frequency band decreases
Solution Approach 1:
The patent changes the geometric parameters of the non-conductive portions by extending two opposite sides to create rounded rectangular shapes. This parameter change increases the effective gap area for current flow while maintaining the overall mesh density needed for electromagnetic wave transmission, thus resolving the trade-off between current distribution and wave transmittance.
3Ease of manufacture
If a heat generating member with plated layer and metal layer is used to remove snow, ice, and fog, then de-icing function is improved, but the member cannot allow transmission of only electromagnetic waves in a specific frequency band
Solution Approach 1:
The patent creates a multi-functional transparent conductive film that simultaneously provides de-icing capability through resistive heating and electromagnetic wave frequency selectivity through the mesh pattern with rounded rectangular non-conductive portions. This single structure performs both functions without requiring separate components.
Solution Approach 2:
The patent uses a composite structure combining transparent conductive material in a mesh pattern with specific rounded rectangular non-conductive portions. This composite design integrates the heating function (from the conductive material) and the frequency-selective transmission function (from the patterned structure) into a single element.
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 solution effectively suppresses local deterioration during heat generation, maintains the function of transmitting only electromagnetic waves in a specific frequency band, and enhances shielding properties in the opaque state of a light control device.
Implementation Method 1
a heat generating member disclosed in WO2017/163830A includes: a three-dimensional structure with a plated layer; and a conductive laminate including a metal layer disposed on the plated layer, in which the metal layer functions as a heating wire
Implementation Method 2
a structure of a metal mesh disclosed in Vyachesla V. Komarov, Valery P. Meschanov, 'Transmission properties of metal mesh filters at 90 GHz', Journal of Computational Electronics, Feb. 28, 2019, 18:696-704 is known. In the metal mesh disclosed in Vyachesla V. Komarov, Valery P. Meschanov, 'Transmission properties of metal mesh filters at 90 GHz', Journal of Computational Electronics, Feb. 28, 2019, 18:696-704, a plurality of cross-shaped non-conductive portions arranged in a lattice form in two directions orthogonal to each other are formed. Due to the plurality of non-conductive portions, an electromagnetic wave in a frequency band corresponding to the size of the cross shape is likely to transmit the metal mesh, and an electromagnetic wave in the other frequency band is shielded.
Data Source
AI summary
A transparent conductive film includes a mesh-shaped portion that is formed of a plurality of conductive wirings, in which the mesh-shaped portion includes a plurality of non-conductive portions (22) that are trimmed by the continuous conductive wiring (21A), the non-conductive portion (22) includes a pair of extension portions (E1, E2) that extend along a pair of central axes (C1, C2) orthogonal to each other and have the same length, the pair of extension portions (E1, E2) intersect each other at an intersection (K) of the pair of central axes (C1, C2), each of the pair of extension portions (E1, E2) includes a projection portion (G1, G2) that projects in a direction intersecting an extension direction, and the non-conductive portion (22) has a shape that is symmetric with respect to each of the pair of central axes. (C1, C2).