Laminated Glass Interlayer Tuning for Millimeter-Wave Transmission
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Solution Overview
Problem
Existing laminated glasses for vehicles face challenges in improving electromagnetic wave transmission in the millimeter-wave band while maintaining structural strength, as previous solutions either complicate the manufacturing process or reduce the glass strength by modifying the glass structure.
Innovation Solution
A laminated glass design comprising a first and second glass plate with an interlayer film, where specific relative dielectric constants and reflection coefficients are optimized to enhance electromagnetic wave transmission between 60 GHz and 100 GHz, without the need to remove any glass parts, thus maintaining structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If glass is removed and electromagnetic wave transmission material is provided, then electromagnetic wave transmission is improved, but manufacturing process becomes complicated
Solution Approach 1:
The patent changes the dielectric constant parameter of the interlayer film to improve electromagnetic wave transmission. By selecting materials with specific dielectric constants (e.g., PVB with εr=3.5, EVA with εr=2.8, or their blends), the patent achieves better transmission characteristics without modifying the glass structure or complicating the manufacturing process.
Solution Approach 2:
The patent uses composite interlayer films made by blending different polymers (PVB and EVA) or combining polymer layers with inorganic powder layers. This composite approach allows tuning of dielectric constants to optimize electromagnetic wave transmission while maintaining a simple laminated glass structure and standard manufacturing processes.
2Reliability
If hole is formed in inner pane, then sensitivity for detecting electromagnetic radiation is improved, but glass strength is lowered
Solution Approach 1:
Instead of forming holes in the glass, the patent changes the dielectric constant parameter of the interlayer film material. This approach improves electromagnetic radiation detection sensitivity by optimizing the optical properties of the interlayer film without compromising the structural integrity and strength of the glass panes.
Solution Approach 2:
The patent uses the interlayer film as an intermediary element to improve electromagnetic radiation detection. By selecting materials with appropriate dielectric constants, the interlayer film enhances the transmission and detection of electromagnetic radiation while the glass panes maintain their full strength, as no holes are formed in the glass structure.
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 design effectively improves electromagnetic wave transmission in the millimeter-wave band while ensuring the strength required for ordinary laminated glass, simplifying the manufacturing process and maintaining glass integrity.
Implementation Method 1
a relative dielectric constant of the first interlayer film at the frequency F is represented by εm1
Implementation Method 2
a reflection coefficient at an interface between the first glass plate and the first interlayer film when an electromagnetic wave having the frequency F is incident on the laminated glass is represented by Γ1
Data Source
AI summary
A laminated glass according to an embodiment of the present invention includes a first glass plate, a second glass plate, and an interlayer film held between the first glass plate and the second glass plate. When a relative dielectric constant of the first glass plate is represented by εg1; a relative dielectric constant of the second glass plate is represented by εg2; a relative dielectric constant of a first interlayer film provided in a first region of the interlayer film is represented by εm1; a reflection coefficient at an interface between the first glass plate and the first interlayer film is represented by Γ1; and a reflection coefficient at an interface between the second glass plate and the first interlayer film is represented by Γ2, the reflection coefficients Γ1 and Γ2 satisfy relations 0.0≤Γ1≤0.2 and 0.0≤Γ2≤0.2.