Heated Glazing Data Window Layout for Uniform Defogging
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Solution Overview
Problem
Existing glazings with data transmission windows face challenges in achieving uniform heat distribution and minimizing hot/cold spots while maintaining effective RF transmission.
Innovation Solution
A glazing design with a resistive coating featuring deletion lines forming channels, where conductive elements are positioned within these channels but separated from busbars by the resistive coating, allowing for controlled current flow and heat distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the conductive coating is interrupted to create a data transmission window, then RF transmission is enabled, but hot spots form around the lateral edges of the interruption
Solution Approach 1:
A conductive element is introduced as an intermediary component within the data transmission window channel. This conductive element is separated from the busbars by the resistive coating, acting as a mediator to redistribute current flow and eliminate hot spots while preserving RF transmission capability through the interruption zone.
Solution Approach 2:
The resistive coating is strategically positioned between the conductive element and busbars to create localized electrical resistance. This local quality change allows controlled current distribution specifically in the regions adjacent to the data transmission window, preventing hot spot formation at the interruption edges while maintaining overall system functionality.
2Reliability
If conductive elements are positioned directly contacting busbars, then electrical connection is achieved, but unwanted hot spots and non-uniform heat distribution occur
Solution Approach 1:
The resistive coating serves as an intermediary layer between the conductive element and the busbars. This intermediate resistive layer maintains electrical connection reliability while controlling current density distribution, thereby preventing the formation of unwanted hot spots that would occur with direct contact.
Solution Approach 2:
The electrical resistance parameter is deliberately modified by introducing the resistive coating in specific locations. This parameter change creates controlled resistance zones that regulate current flow, transforming the temperature distribution pattern from concentrated hot spots to more uniform heat distribution across the glazing surface.
3Temperature
If the resistive coating is used for resistive heating, then heat distribution is achieved, but the data transmission window interrupts the current flow
Solution Approach 1:
The conductive path is segmented into multiple components: busbars, resistive coating zones, and conductive elements within the data transmission window. This segmentation allows the system to maintain current flow continuity through the interrupted zone by routing current through the conductive element, while still enabling RF transmission through the same zone.
Solution Approach 2:
The conductive element within the data transmission window serves multiple functions simultaneously: it maintains electrical current flow continuity for heating purposes and allows RF electromagnetic wave transmission through the interruption zone. This multi-functionality resolves the contradiction between maintaining current flow and enabling data transmission.
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 design reduces hot spots, increases cold spot temperatures, and enhances defogging/defrosting efficiency with minimal impact on RF transmission.
Implementation Method 1
a resistive coating extending across a part of the first glass sheet; first and second busbars connected to the resistive coating
Implementation Method 2
at least one conductive element positioned in at least one of the channels; wherein the at least one conductive element is separated from the first and second busbars by the resistive coating
Implementation Method 3
a data transmission window in the resistive coating, comprising: a plurality of deletion lines in the resistive coating
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
The invention is a glazing (10) comprising a first glass sheet (1), a resistive coating (2) extending across a part of the first glass sheet (1), first and second busbars (3, 4) connected to the resistive coating (2), a data transmission window (5) in the resistive coating (2), comprising a plurality of deletion lines (6) in the resistive coating (2), a plurality of channels (7), formed by the plurality of deletion lines (6), and at least one conductive element (8) positioned in at least one of the channels (7) wherein the conductive element (8) is separated from the first and second busbars (3, 4) by the resistive coating (2).