Clear-Lens Vehicle Headlamp Shield for Sunlight Burn Prevention
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Solution Overview
Problem
Vehicle headlamps with visible internal reflectors through a clear lens are prone to damage from reflected sunlight, leading to unsightly 'burning' and reduced lighting efficiency, with existing solutions being expensive and weight-increasing.
Innovation Solution
A vehicle lighting device with a cup-shaped housing and a transparent lens, featuring a shield with a reflecting surface and projections to deflect sunlight and prevent damage, while maintaining optical functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a clear transparent lens is used to close the cup-shaped housing, then the aesthetic appearance and visibility of internal reflectors are improved, but the lens and internal components become susceptible to damage from reflected sunlight
Solution Approach 1:
A shield element is introduced as an intermediary component positioned between the clear lens and the internal reflectors. This shield intercepts sunlight before it can reflect off the reflectors and cause damage to the lens or housing, while allowing the clear lens aesthetic to be maintained. The shield acts as a mediator that blocks harmful reflected sunlight paths without compromising the visual appearance through the clear lens.
2Reliability
If glass lenses and metal coatings are used to prevent damage from heating, then the resistance to thermal damage is improved, but the cost and weight of the headlamp increase
Solution Approach 1:
The shield is made from a lightweight, inexpensive material such as plastic or polymer, replacing the need for heavy glass lenses and metal coatings. This disposable-style protective element provides sufficient thermal protection without the weight and cost penalties of traditional materials. The shield can be easily replaced if needed, and its low cost allows for economical implementation.
3Reliability
If a shield is added to prevent damage from reflected sunlight, then the protection of internal components is improved, but the device complexity increases
Solution Approach 1:
The shield is integrated with existing headlamp components such as the reflector assembly or housing structure, merging multiple functions into a single element. This integration approach adds the protective function without significantly increasing overall device complexity. The shield becomes part of the existing component architecture rather than a separate additive element.
4Reliability
If the shield blocks reflected sunlight, then the prevention of burning and damage is improved, but the optical functionality and light transmission may be affected
Solution Approach 1:
The shield is positioned and designed to block sunlight only in specific critical areas where reflected sunlight would cause damage, while leaving other areas open for optimal light transmission. Different regions of the headlamp assembly have different protective requirements, and the shield provides localized protection where needed without unnecessarily obstructing the optical path for functional lighting.
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 effectively disperses sunlight and prevents damage to the lens and internal components, ensuring the headlamp's efficiency and aesthetic integrity without increasing cost or weight.
Implementation Method 1
a shield (10) which is placed at least partly facing the at least one reflector (3) and substantially parallel to the optical axis (A)... a reflecting surface (11) of the shield (10) provided with projections (14) uniformly distributed thereon
Data Source
Figure 1
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AI summary
A lighting device (1) for a vehicle including a cup-shaped housing (2) housing at least one reflector (3), operatively associated with a light source (4), and a transparent lens (5), which closes a front opening (6) of the housing and through which the reflector (3) is visible; wherein a shield (10) is placed inside the housing (2), at least partly facing the reflector (3) and substantially parallel to an optical axis (A) of the lighting device, and delimited towards the reflector (3) by a reflecting surface (11) provided with projections (14) uniformly distributed thereon, e.g., grooved or embossed.