Vehicle Lamp Venting Geometry for Condensation Control
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Solution Overview
Problem
Existing vehicle lamps face issues with condensation on the inner surface of the outer lens due to temperature changes, leading to reduced light transmittance and lamp function deterioration, and existing solutions increase complexity and cost with additional parts.
Innovation Solution
A vehicle lamp design featuring ventilation ports with varying diameters on the front and back surfaces of the housing, utilizing tubular ducts with changing diameters to control airflow and prevent condensation through controlled air circulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ventilation ports with varying diameters are used to control airflow and prevent condensation, then condensation prevention is improved, but the housing design becomes more complex
Solution Approach 1:
The patent applies local quality by providing ventilation ports with different diameter characteristics at different locations (front surface vs. back surface) of the housing. Specifically, at least one ventilation port has a diameter on the front surface side that differs from its diameter on the back surface side, creating localized airflow control zones that prevent condensation without requiring complete redesign of the entire housing structure.
Solution Approach 2:
The invention employs asymmetry by designing ventilation ports with non-uniform diameter along their length, where the diameter changes between the front surface side and back surface side of the housing. This asymmetric design creates directional airflow patterns that effectively prevent condensation on the outer lens while maintaining a relatively simple overall housing configuration.
2Ease of operation
If multiple ventilation ports with different diameters are provided, then airflow control is improved, but manufacturing complexity increases
Solution Approach 1:
The patent implements local quality by creating ventilation ports with spatially varying diameter characteristics, where the diameter changes from the front surface side to the back surface side. This localized diameter variation enables precise airflow control at different positions within the lighting body, achieving effective condensation prevention while maintaining manufacturability through focused design modifications rather than complex overall restructuring.
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 prevents condensation on the outer lens while maintaining a simple configuration, enhancing airflow control and heat dissipation within the lighting body.
Implementation Method 1
the air inside the lighting body expands and contracts due to temperature changes caused by turning the lighting unit on and off, or temperature changes caused by the external environment
Implementation Method 2
when the outside temperature is lower than the temperature in the lighting body, humidity (moisture) in the lighting body may be condensed on an inner surface of the outer lens to generate cloudiness on the inner surface of the outer lens
Data Source
AI summary
A vehicle lamp has a lighting unit disposed inside a lighting body constituted by a housing having an opening in a front surface of the housing and an outer lens configured to cover the opening of the housing, a plurality of ventilation ports are provided in the housing, and at least one of the plurality of ventilation ports has a diameter that changes between a front surface side and a back surface side of the housing.