Camera Heater Lens Cap for ADAS Fog Prevention
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Solution Overview
Problem
Advanced driver assistance cameras are susceptible to image degradation due to frost, ice, fog, and water spray, which affects their functionality during adverse weather conditions.
Innovation Solution
A 'lens cap' heater system with a self-contained heating element and a transparent window treated with a hydrophobic material, using a polymer positive temperature coefficient (PTC) material for automatic temperature regulation, which heats a small air volume around the lens to prevent ice and fog accumulation without blocking the view.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixedly connected heater system is used on the camera, then the camera is protected from ice and fog, but the system complexity increases and the heater cannot be removed or adapted to different cameras
Solution Approach 1:
The heater system is divided into a removable lens cap component that can be separated from the camera body. This allows the heating element to be independently attached and removed, reducing overall system complexity while maintaining protection functionality when needed.
Solution Approach 2:
The lens cap heater is designed to be universally compatible with multiple camera models through adjustable positioning mechanisms. The same heater unit can be adapted to different camera types, eliminating the need for custom-integrated heaters for each camera model.
2Reliability
If the camera lens is directly heated, then ice and fog are effectively removed, but the heating element blocks the camera's field of view
Solution Approach 1:
A transparent window is introduced as an intermediary between the heating element and the external environment. This allows the heater to warm the air and surfaces behind it without the heating element itself blocking the camera's field of view, maintaining both heating effectiveness and optical clarity.
Solution Approach 2:
The heating function is moved from a two-dimensional surface heater directly on the lens to a three-dimensional air volume heater positioned in front of the lens. By heating the air space rather than directly heating the lens surface, the system avoids blocking the field of view while still preventing ice and fog accumulation.
3Ease of operation
If a removable lens cap heater is used, then the system is easier to install and adapt to different cameras, but the reliability of continuous protection may be reduced
Solution Approach 1:
The lens cap heater is pre-configured with the heating element and transparent window assembly before installation on the camera. This preliminary preparation ensures that when installed, the system immediately provides protection without requiring complex adjustments or assembly steps that could compromise reliability.
Solution Approach 2:
Traditional mechanical fastening systems are replaced with simpler attachment mechanisms that maintain secure positioning while allowing easy removal. This substitution preserves the reliability of the connection during operation while significantly improving ease of installation and replacement.
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
Effectively prevents the accumulation of ice and fog on the camera lens, ensuring clear imaging in adverse weather conditions by repelling liquid water and dissipating frozen water without obstructing the camera's field of view.
Implementation Method 1
The heater may employ a polymer positive temperature coefficient (PTC) material that provides automatic temperature regulation simplifying control of the heater
Implementation Method 2
The heater applies heat to the window area without blocking the window area by heating a small air volume in the vicinity of the window
Implementation Method 3
The transparent window may be treated with a hydrophobic material
Data Source
Figure 1~5
AI summary
A heater system for resisting fog and ice buildup on advanced driver assistance cameras provides a chamber covering the camera lens and providing a transparent window through which the camera lens may be directed. A heating element communicates with an air gap between the lens and the transparent window and the periphery of the transparent window to provide heating of the transparent window without blocking an image received by the camera lens.