Optical Sensor Air Curtain Protection via Venturi Suction
Solution Overview
Problem
Existing rear view camera systems face challenges with dirt and water accumulation due to their exposed position, leading to reduced operability, especially in rainy conditions, and require complex and costly maintenance solutions like filters and dehumidifiers.
Innovation Solution
A device with an air projection nozzle and a suction pipe connected downstream of the air discharge pump, utilizing a Venturi effect to create a protective air curtain around the optical sensor, eliminating the need for filters and allowing the pump to be installed remotely, reducing maintenance and costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the camera is mounted at the rear bumper or number plate level for optimal viewing angle, then the viewing angle is improved, but the camera becomes exposed to splashing dirt and rain that can damage or reduce its effectiveness
Solution Approach 1:
The patent introduces an air curtain as an intermediary protective barrier between the camera lens and the external environment. The air curtain is generated by a projection nozzle that directs a controlled air flow across the lens surface, creating a protective shield that prevents dirt and rain from directly contacting the lens while allowing the camera to remain in its optimal mounting position at the rear bumper or number plate level
2Strength
If a protective window is fixed to the bodywork to protect the camera from external aggression, then protection from external damage is improved, but cleaning the camera becomes particularly difficult
Solution Approach 1:
The air curtain acts as a dynamic protective intermediary that replaces the static protective window. This eliminates the cleaning difficulty associated with fixed protective windows while maintaining protection from external damage. The air flow continuously prevents污染物 deposition on the lens surface
Solution Approach 2:
The air curtain system provides self-cleaning functionality by maintaining a continuous air flow that prevents dirt and rain accumulation on the lens. The system automatically maintains lens cleanliness without requiring manual intervention or complex cleaning mechanisms
3Ease of operation
If a cleaning liquid nozzle is provided in the vicinity of the video camera to eliminate deposited pollutants, then cleaning effectiveness is improved, but the optic remains unprotected from projections that can damage it
Solution Approach 1:
The patent uses pneumatic principles by employing a projection nozzle that generates a controlled air flow (air curtain) across the lens surface. This pneumatic barrier provides both cleaning functionality and protective coverage against damaging projections, combining both functions into a single system that addresses the limitations of liquid-based cleaning alone
4Object-affected harmful factors
If a curtain of air is projected continuously in front of the video camera to prevent dirt deposition, then protection against pollution is improved, but the distal part of the lens forms a zone that is difficult to dry or de-ice
Solution Approach 1:
The patent applies local quality by positioning the projection nozzle at the external circumference of the convex lens and using a branching flow passage to redirect air flow specifically to the distal part of the lens. This creates localized air flow zones that address the specific needs of different lens areas, ensuring effective drying and de-icing of the distal region while maintaining overall pollution protection
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 solution provides effective protection against dirt and water, maintaining the camera's operability with reduced maintenance and lower costs, while allowing for a wide view without image distortion, even at higher vehicle speeds.
Implementation Method 1
A device with an air projection nozzle and a suction pipe connected downstream of the air discharge pump, utilizing a Venturi effect to create a protective air curtain around the optical sensor
Data Source
AI summary
A device for protection of an optical sensor includes at least one nozzle for projection of air in front of the optical sensor, the projection nozzle being arranged on a side of the optical sensor and linked to an air discharge pump via a discharge conduit such that the air projected by the air projection nozzle is flush with the optical sensor, and at least one suction conduit arranged on the opposite side of the optical sensor to the projection nozzle. The suction conduit is linked to the discharge conduit of the pump, downstream of the pump, such that the suction in the suction conduit is achieved by a Venturi effect.