Vehicle Camera Glass Cover Charging Suppression
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Solution Overview
Problem
Existing camera devices with water-repelling films on the glass cover surfaces face issues with charging, which can lead to reduced water-repelling performance due to dust adsorption and interference with imaging by fog and frost.
Innovation Solution
A camera device with a heat-generating, electrically conductive film positioned on the reverse side of the water-repelling film, which generates heat to suppress charging and maintain the water-repelling performance by being electrically connected and exposed through holes in the film, ensuring effective heating of the imaging area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a water repelling film is formed on the obverse side surface of the glass cover, then water repelling performance is improved, but charging occurs on the film surface causing dust adsorption and reduced performance
Solution Approach 1:
A heat generating film is introduced as an intermediary between the water repelling film and the glass cover. This intermediate conductive layer suppresses charging of the water repelling film by providing an electrical discharge path, while still allowing the water repelling function to operate effectively on the outer surface.
Solution Approach 2:
The electrical conductivity parameter is modified by adding a heat generating film with specific conductivity properties. This changes the electrical characteristics of the glass cover assembly, enabling charge dissipation while maintaining optical and water repelling properties.
2Reliability
If a transparent conductive film is formed on the glass cover to generate heat, then charging is suppressed, but the film must be positioned precisely to avoid interfering with imaging
Solution Approach 1:
The heat generating film is positioned on the reverse side of the glass cover rather than on the obverse side where imaging occurs. This spatial repositioning in the thickness dimension eliminates interference with light transmission and imaging while still providing charging suppression through the conductive layer.
3Reliability
If the heat generating film is positioned on the reverse side of the glass cover, then imaging is not interfered with, but the heating efficiency to the water repelling film surface may be reduced
Solution Approach 1:
The glass cover is designed as a composite structure with multiple layers including the glass substrate, water repelling film, and heat generating film. This composite design allows simultaneous optimization of thermal conduction, optical transparency, and electrical conductivity properties across different layers.
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 camera device effectively suppresses charging of the water-repelling film, maintains its performance by reducing dust adsorption, and ensures clear imaging by efficiently removing fog and frost from the glass cover surface.
Implementation Method 1
a heat generating film that is provided at the transmitting member further toward a reverse side than the water repelling film, that is electrically conductive, and that generates heat
Implementation Method 2
a water repelling film that forms an obverse side surface of the transmitting member
Data Source
AI summary
At a camera device for a vehicle, a camera images an obverse side of a glass cover via the glass cover. A water repelling film is formed on an obverse side surface of the glass cover. A transparent conductive film of the glass cover generates heat, and the glass cover is heated. Because the transparent conductive film is electrically conductive, electrical resistance of an obverse side surface of the water repelling film can be lowered by the transparent conductive film, and charging of the obverse side surface of the water repelling film can be suppressed.