Heated Laminated Glass With Variable-Width Conductive Lines
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Solution Overview
Problem
Conventional laminated glass with conductive heating elements featuring linear members experiences significant optical effects such as rainbow patterns and shafts of light due to diffraction, causing discomfort and safety concerns for vehicle drivers.
Innovation Solution
The laminated glass design incorporates a conductive heating element with linear members having varying line widths between 2 μm and 30 μm, where the line widths of adjacent members differ by 1-10 μm and have a standard deviation greater than 0.5 μm, effectively reducing the visibility of these optical effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If linear members with constant line width are used in conductive heating element, then manufacturing is simplified, but optical effects such as rainbow patterns and shafts of light are generated causing driver discomfort
Solution Approach 1:
The patent applies local quality by varying the line width of linear members at different positions rather than maintaining a constant width throughout. Specifically, the line width is set to be greater than or equal to 2 μm and less than or equal to 30 μm, with different line widths in different regions to suppress diffraction-induced optical effects while maintaining heating functionality
Solution Approach 2:
The patent changes the geometric parameter of the linear members by controlling the line width within a specific range (2-30 μm) and varying it across different positions. This parameter variation suppresses the formation of rainbow patterns and shafts of light caused by diffraction, while still maintaining the conductive heating function
2Object-affected harmful factors
If line width of linear members is reduced to suppress optical effects, then visibility is improved, but heating efficiency may be reduced
Solution Approach 1:
The patent optimizes the line width parameter within the range of 2-30 μm to achieve a balance between suppressing optical effects and maintaining heating efficiency. By controlling the line width to be greater than or equal to 2 μm, sufficient heating performance is ensured, while keeping it less than or equal to 30 μm reduces the visibility of diffraction patterns
Solution Approach 2:
The patent addresses the trade-off by introducing variation in the line width dimension across different positions of the linear members. This spatial variation in the width dimension allows suppression of optical effects in certain regions while maintaining adequate heating capability in other regions, effectively resolving the contradiction through dimensional diversity
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 significantly reduces the visibility of rainbow patterns and shafts of light, enhancing driver comfort and safety by minimizing the discomfort caused by diffracted light, allowing for effective anti-fogging and ice melting without hindering the driver's view.
Implementation Method 1
By generating heat in the conductive heating element, this laminated glass can clear fog on the windowpane and/or eliminate frost of moisture adhered to the windowpane in winter
Implementation Method 2
there may be cases where light is diffracted by the linear members, to cause optical effects such that rainbow patterns are observed and/or shafts of light are generated
Data Source
AI summary
The present laminated glass includes a pair of glass plates facing each other; an interlayer positioned between the pair of glass plates; and a plurality of linear members arranged in parallel to heat a transparent region of the pair of glass plates, wherein each of the plurality of linear members has a line width of greater than or equal to 2 μm and less than or equal to 30 μm, and wherein at least part of the plurality of linear members has the line width that is not constant.