Curved Heating Electrode Layout for Clear Vehicle Window Defogging

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Solution Overview

Problem

Conventional heat-generating conducting bodies in glass windows, such as those used in vehicles, face challenges in achieving high heat generation performance while minimizing visual recognition and preventing beam of light interference, uneven heating, and glare, which affect visibility.

Innovation Solution

The use of heat-generating conducting bodies with a rectangular cross section, arranged in a direction different from their extension, and specific width and thickness ratios, along with curved and irregular patterns, to enhance heat generation efficiency and reduce visual recognition and glare.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If heat-generating conducting bodies are arranged regularly in glass windows, then heat generation performance is improved, but beam of light interference occurs affecting visibility

Engineering Contradiction:

Improveheat generation performanceVSAvoidbeam of light interference

Core Design Contradiction:

PowerVSObject-affected harmful factors

Solution Approach 1:

The patent applies asymmetry by using irregular patterns for the heat-generating conducting bodies instead of regular arrangements. The conducting bodies are positioned at irregular intervals and with irregular shapes, which disrupts the periodic structure that causes beam of light interference while maintaining effective heat generation across the glass window surface.

Inventive Principle:

Principle #4Asymmetry

Solution Approach 2:

The patent employs curvature by designing the heat-generating conducting bodies with wavy or curved lines rather than straight linear forms. This curvature disrupts the regular geometric patterns that cause constructive interference of light beams, thereby reducing visibility interference while the distributed curved structures continue to generate heat effectively.

Inventive Principle:

Principle #14Spheroidality (Curvature)

2Power

If heat-generating conducting bodies are made with larger cross-sectional area, then heat generation efficiency is improved, but visual recognition increases reducing transparency

Engineering Contradiction:

Improveheat generation efficiencyVSAvoidvisual recognition

Core Design Contradiction:

PowerVSIllumination intensity

Solution Approach 1:

The patent applies dimensionality change by transitioning from two-dimensional planar conducting bodies to three-dimensional structures with specific geometric configurations. The conducting bodies are formed with rectangular cross-sections having specific width-to-thickness ratios, creating a three-dimensional structure that increases heat generation capacity through enhanced cross-sectional area while maintaining visual invisibility through optimized dimensional proportions and irregular spatial arrangement.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Ease of manufacture

If heat-generating conducting bodies are arranged in straight lines, then manufacturing is simplified, but glare and uneven heating occur affecting visibility

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoidglare and uneven heating

Core Design Contradiction:

Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

The patent applies curvature by replacing straight linear arrangements of heat-generating conducting bodies with wavy or curved configurations. This curvature eliminates the parallel straight lines that cause glare through specular reflection while the continuous curved paths still provide effective heat generation. The irregular curved patterns also promote more uniform heat distribution across the glass surface.

Inventive Principle:

Principle #14Spheroidality (Curvature)

Solution Approach 2:

The patent applies local quality by varying the properties of heat-generating conducting bodies at different locations. The conducting bodies have different shapes, sizes, and curvatures at different positions, with some sections having larger cross-sectional areas for higher heat generation and other sections having smaller areas or different orientations to control light reflection and prevent glare, creating locally optimized performance throughout the structure.

Inventive Principle:

Principle #3Local quality

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 allows for efficient heat generation with reduced visual impact and improved visibility by minimizing beam of light interference and uneven heating, ensuring clear visibility even when used in vehicle windows.

Implementation Method 1

a heating electrode device including a heat-generating conducting body that is energized to generate heat by Joule heat

Methodology Applied

Scientific EffectJoule heating: Joule Heating

Data Source

PatentEP3955704B1Heating electrode device, electrical heating glass, heat-generating plate, vehicle, window for building, sheet with conductor, conductive pattern sheet, conductive heat-generating body, laminated glass, and manufacturing method for conductive heat-generating body

Publication Date: 2025.07.23 DAI NIPPON PRINTING CO LTD

Figure 1(a)~1(c)
Figure 2
Figure 3~4

AI summary

A conductive heat-generating body comprising: a plurality of curved heat-generating bodies arranged separated from each other in a first direction and extending in a second direction intersecting with the first direction, wherein a ratio obtained by dividing a total length of each of the plurality of curved heat-generating bodies in the second direction by a shortest distance between both ends of each of the plurality of curved heat-generating bodies larger than 1.0 and equal to or less than 1.5.