Vehicle Windshield Anti-Fogging Film Segmentation for Optical Bonding
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Solution Overview
Problem
Vehicle windshields with anti-fogging films face challenges in bonding optical devices due to the anti-fogging film's presence, leading to insufficient bonding strength and anti-fogging performance in sensing regions.
Innovation Solution
A vehicle windshield design featuring a first region without anti-fogging film for optical device attachment and a second region with a minimum film thickness of at least 5 μm for anti-fogging performance, using a belt-like ceramic layer and strategically positioned anti-fogging film to ensure high bonding strength and effective anti-fogging performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the anti-fogging film is provided continuously across the windshield surface, then the anti-fogging performance is improved, but the bonding strength of the optical device is reduced
Solution Approach 1:
The anti-fogging film is segmented into a first region (without film) and a second region (with film), allowing the optical device to be bonded in the first region while maintaining anti-fogging performance in the second region where the sensing area is located
Solution Approach 2:
Different regions of the windshield are given different properties: the first region has no anti-fogging film to enable strong bonding, while the second region has the anti-fogging film to prevent fogging in the sensing area, optimizing both bonding strength and anti-fogging performance in their respective locations
2Strength
If the anti-fogging film is removed at the portion where the optical device is attached, then the bonding strength is improved, but the anti-fogging performance in the sensing region may become insufficient
Solution Approach 1:
The windshield surface is divided into two functional zones: the first region where the anti-fogging film is removed to enable optical device attachment, and the second region where the anti-fogging film is maintained to ensure fogging prevention in the sensing area
Solution Approach 2:
The anti-fogging film is selectively applied only to the second region containing the sensing area, providing localized anti-fogging protection where it is most needed while leaving the first region free for optimal device bonding
3Illumination intensity
If the boundary line between regions has a narrow linewidth, then the visual recognition is improved, but the perspective distortion increases
Solution Approach 1:
The boundary line linewidth is optimized to fall within the specific range of 10-200 μm, balancing visual recognizability for drivers with minimal perspective distortion that could interfere with the optical device's sensing function
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 achieves high bonding strength for optical devices and sufficient anti-fogging performance in sensing regions, preventing fogging and ensuring reliable signal transmission and reception in high-humidity environments.
Implementation Method 1
the anti-fogging film that includes a water-absorbing cross-linked resin layer obtained from a water-absorbing resin, such as polyepoxides, is provided on a surface of the glass and the anti-fogging film thus absorbs and removes tiny water droplets that could cause fogging
Implementation Method 2
the boundary line having a linewidth of 10-200 μm, the boundary line being visually recognized by scattering of incoming light
Data Source
AI summary
A vehicle windshield includes a window plate and an anti-fogging film provided on an interior side surface of the window plate, with a first region and a second region within a see-through region. The anti-fogging film is not on the first region but on the second region. The first region includes a belt-like region in an upper portion of the see-through region. The second region is a region that includes at least a test area B and that includes a continuous projection portion provided on an upper side. The anti-fogging film in the second region has a minimum film thickness of no less than 5 μm. At least a boundary between the first region and the second region excluding the projection portion has no perspective distortion and is formed by a boundary line having a linewidth of 10-200 μm that is visually recognized by scattering of incoming light.