Fog Lamp Lens With Diffused Regions To Reduce Solar Heating
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Solution Overview
Problem
Automotive fog lamps can cause excessive solar heating on vehicle fascias due to total internal reflection of solar light rays, potentially damaging plastic components, and redesigning the fascia to mitigate this is costly or impractical.
Innovation Solution
The design incorporates a condenser lens with a convex front surface featuring a smooth central region and diffused regions on either side, where the diffused regions' surface treatments, such as frosted or knurled patterns, diffuse incoming light rays to prevent concentration and reduce solar heating by dispersing the light intensity across the fascia.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a glass aspheric condenser lens is used to focus light in a fog lamp, then light focusing capability is improved, but solar heating damage to vehicle fascia occurs due to total internal reflection concentrating solar rays at a focal point
Solution Approach 1:
The condenser lens front surface is divided into multiple regions with different optical properties: a central region that maintains smooth light transmission for fog lamp illumination, and peripheral regions with diffusing surface treatments that scatter concentrated solar rays. This local differentiation allows the lens to simultaneously achieve light focusing for the fog lamp while preventing solar heating damage through selective diffusion in specific areas.
Solution Approach 2:
The front surface of the condenser lens is segmented into distinct functional zones: a central smooth region for primary light output and peripheral diffusing regions with treatments such as knurling, frosting, or pillow optics. This segmentation separates the light transmission function from the solar radiation management function, allowing each region to optimize its specific role without interfering with the other.
2Object-affected harmful factors
If the vehicle fascia is redesigned to reduce solar effects, then solar heating damage is prevented, but manufacturing cost increases or redesign becomes impossible
Solution Approach 1:
The solar heating problem is extracted from the vehicle fascia system and relocated to the condenser lens itself. By incorporating diffusing surface treatments directly on the lens front surface, the solution transfers the solar radiation management function from the fascia (which would require expensive redesign) to the lamp assembly (which can be modified more economically). This extraction allows the fascia to remain unchanged while still preventing solar heating damage.
Solution Approach 2:
The condenser lens acts as an intermediary element between the fog lamp and the vehicle fascia. The diffusing surface treatments on the lens serve as a mediating mechanism that intercepts and scatters concentrated solar rays before they can reach and damage the fascia. This intermediary approach protects the fascia without requiring its redesign, as the lens absorbs the solar management function.
3Object-affected harmful factors
If diffusing surface treatments are applied to the condenser lens, then solar heating is dispersed, but light transmission may be affected
Solution Approach 1:
The front surface of the condenser lens is divided into distinct regions with different optical properties: a central smooth region that maintains high light transmission for fog lamp illumination, and peripheral diffusing regions with surface treatments applied only where needed to scatter solar rays. This local differentiation ensures that light transmission is preserved in the central area while solar heating is dispersed in the peripheral areas, eliminating the trade-off between these two functions.
Solution Approach 2:
The lens front surface is segmented into functional zones where diffusing treatments such as knurling, frosting, or pillow optics are applied selectively to specific peripheral regions rather than the entire surface. This segmentation allows sunlight entering at oblique angles to be scattered by the treated regions, preventing focal point concentration, while the untreated central region maintains optimal light transmission for the fog lamp beam.
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 solution effectively disperses solar heating across the vehicle fascia, reducing the risk of damage while maintaining the fog lamp's functionality and visibility during poor weather conditions.
Implementation Method 1
a second region including a surface treatment configured to diffuse light rays. When the lamp assembly is energized, all of the light generated by the lamp assembly is directed through the first region, and the second region is positioned relative to the back surface such that when a light ray enters the lamp through the second region, the second region and the back surface cooperate to diffuse the light ray into a plurality of child light rays
Implementation Method 2
solar light rays incoming from certain angles may be reflected off of the back surface of the lens due to a phenomenon known as total internal reflection. The reflected solar light rays may be concentrated at a particular focal point outside of the condenser lens
Data Source
AI summary
A fog lamp for use in an automobile includes a light source, a reflector, and a condenser lens. The front surface of the condenser lens includes an emission region and two diffusion regions. The diffusion regions have a surface treatment that diffuses transmitted light, such as knurling, frosting, texturing, or pillowing. Light emitted by the light source is directed by the reflector through the condenser lens and exits the condenser lens through the emission region. Light that enters the condenser lens through one of the diffusion regions from outside of the lamp, such as solar light, is diffused and reduced in intensity. The diffusion regions may be positioned relative to a back surface of the lens to cause the diffused light to be reflected due to total internal reflection. The diffused light may exit the lens through the other diffusion region and become further diffused and reduced in intensity.