Vehicle Lamp Venting with Segmented Air Permeability
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Solution Overview
Problem
New designs for vehicle headlamps with light-transmitting members extending forward and rearward from the forward illumination light source take longer to eliminate condensation on the inner surface, affecting appearance and visibility, especially when water droplets are present in regions that obstruct light transmission.
Innovation Solution
A vehicle lamp design featuring a housing with a light-transmitting member divided into two chambers, each with a vent member: a first vent member with higher air permeability and a second vent member with lower air permeability, positioned to facilitate rapid elimination of condensation by directing water vapor through the first vent member for efficient release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a single vent member is used in conventional headlamp designs, then the structure is simple, but condensation elimination takes longer time
Solution Approach 1:
The single vent member is divided into two separate vent members: a first vent member with higher air permeability and a second vent member with lower air permeability. This segmentation allows each vent member to perform specialized functions, with the first vent member rapidly eliminating condensation by allowing high air flow, while the second vent member provides supplementary ventilation with restricted flow, thereby reducing overall condensation elimination time without creating a complex integrated structure.
Solution Approach 2:
Different regions of the headlamp assembly are assigned different vent member characteristics. The first vent member is positioned and configured with higher air permeability specifically for rapid condensation elimination, while the second vent member has lower air permeability for controlled supplementary ventilation. This local differentiation of properties optimizes the condensation elimination function without requiring complex system-wide changes.
2Shape
If light-transmitting members extend forward and rearward from the light source, then aesthetic appearance is improved, but condensation forms more readily on the inner surface
Solution Approach 1:
The lamp chamber is divided into a first lamp chamber and a second lamp chamber, with corresponding first and second vent members positioned at different locations. This segmentation allows targeted ventilation control in different regions, efficiently removing condensation that forms on the extended light-transmitting member surfaces while preserving the aesthetic extended shape.
Solution Approach 2:
The vent members utilize porous materials with controlled air permeability characteristics. The first vent member employs a porous structure with higher air permeability to rapidly eliminate condensation from the extended light-transmitting member regions, while the second vent member uses a porous structure with lower air permeability for controlled supplementary ventilation, thereby managing condensation without altering the aesthetic extended shape.
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
This design allows for the rapid elimination of condensation on the inner surface of the light-transmitting member, improving the appearance and visibility of the headlamp by ensuring that condensation is cleared quickly, even when water droplets are present in regions affecting light transmission.
Implementation Method 1
The first vent member and the second vent member each include a porous resin membrane
Implementation Method 2
When the light source 404 is turned on, with the water droplets being formed on the inner surface of the light-transmitting member 403, air in the lamp chamber 406 expands as the temperature of the light-transmitting member 403 increases
Data Source
Figure 1
Figure 2A~2B
Figure 3
AI summary
A lamp chamber (110) includes: a first lamp chamber (110A) located in a forward direction from a first reference plane (P1) and inwardly of a second reference plane (P2) in a width direction of a vehicle; and a second lamp chamber (110B) located in a rearward direction from the first reference plane (P1) and outwardly of the second reference plane (P2) in the width direction of the vehicle. A headlamp (101) includes: a first vent member (105) attached to a first opening portion (102A) provided in a region of a housing (102) facing the first lamp chamber (110A); and a second vent member (106) attached to a second opening portion (102B) provided in a region of the housing (102) facing the second lamp chamber (110B). The vent members (105, 106) each include a waterproof air-permeable body. The air permeability value of the first vent member (105) is higher than the air permeability value of the second vent member (106).