Dome-Shaped Flange Headlamp Thermal Expansion
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Solution Overview
Problem
Motor vehicle headlights with semiconductor light sources face issues due to thermal expansion, leading to changes in distances between light exit and entry surfaces, which affect lighting characteristics and can cause mechanical damage, as existing solutions require matching thermal expansion coefficients between optics and mounts, making it difficult to compensate for thermal changes without mechanical contact.
Innovation Solution
A motor vehicle headlight design featuring a dome-shaped connection flange between the primary optics and fixed bearings, made of silicone, which allows the primary optics to bulge and move away from the light sources during thermal expansion, while the holder's different expansion coefficient minimizes changes in distance between the bearings, preventing mechanical contact and maintaining optimal light coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the distance between the light exit surface of the semiconductor light source and the light entry surface of the primary optics is reduced to improve light coupling efficiency, then the light coupling efficiency is improved, but the risk of mechanical damage to the semiconductor light source increases due to narrow gap dimensions
Solution Approach 1:
The patent introduces a compensating element between the semiconductor light source and the primary optics that provides pre-established thermal compensation. This element is designed to expand thermally in response to heat from the light source, maintaining a safe gap distance while preserving optimal light coupling. The cushioning effect prevents mechanical contact before damage can occur.
Solution Approach 2:
The patent employs a compensating element as an intermediary component between the light source and primary optics. This mediator absorbs thermal expansion effects and maintains the optimal gap distance, allowing both the light source and optics to remain in their ideal positions without direct thermal or mechanical interaction that could cause damage.
2Reliability
If the distance between the light entry surface and light exit surface of the primary optics is increased to accommodate thermal expansion, then thermal compensation is improved, but the light coupling efficiency deteriorates
Solution Approach 1:
The patent divides the optical system into separate functional segments: the light source, the compensating element, and the primary optics. This segmentation allows each component to be optimized independently - the light source can be positioned for maximum light emission, the compensating element handles thermal expansion, and the primary optics maintains optimal coupling distance, resolving the contradiction between thermal compensation and light coupling efficiency.
Solution Approach 2:
The compensating element introduces dynamic adaptability to the system, allowing the gap distance to adjust automatically in response to thermal conditions. As temperature changes, the compensating element expands or contracts to maintain the optimal gap, ensuring both thermal compensation and light coupling efficiency are preserved across varying operating conditions.
3Ease of manufacture
If the holder structure is designed with fixed bearings at the light entry surface level to simplify mounting, then the ease of manufacture is improved, but the ability to compensate for thermal expansion of the primary optics deteriorates
Solution Approach 1:
The compensating element serves as a mediator between the fixed holder structure and the primary optics. It absorbs the thermal expansion effects that would otherwise be transmitted to the optics, allowing the holder to remain simple and fixed while still achieving thermal compensation through the intermediary element.
Solution Approach 2:
The compensating element changes its physical parameters (length, volume) in response to temperature changes. This parameter change allows the system to compensate for thermal expansion of the primary optics while maintaining a simple fixed bearing structure, as the compensating element dynamically adjusts its dimensions to offset thermal effects.
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 effectively compensates for thermal expansion of the primary optics without requiring matching expansion coefficients, preventing mechanical damage and maintaining consistent light distribution and compliance with legal and customer requirements.
Implementation Method 1
the primary optics heating up and thus to a change in distances within the headlight due to thermal component expansion
Implementation Method 2
the holder's different expansion coefficient minimizes changes in distance between the bearings
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The invention relates to a motor vehicle headlamp (10) with at least one semiconductor light source (14) and a primary optical system (16) which collects light emitted from the semiconductor light source (16) and is directed to a secondary optical system (18), wherein the primary optical system (16) receives the light from the light source (14) via a light entry surface (26) and the light is emitted out via a light exit surface (28), wherein the primary optical system (16) has a connecting flange (42) with which the primary optical system is kept in a holder (34) in at least two fixed bearings (52), the fixed bearings are arranged in a first plane, which is parallel to a second plane, a distance (a) is arranged between the first plane and the second plane, and the light entry surface is arranged in the second plane. The motor vehicle headlamp is characterized in that a first section (44) of the connecting flange (42) is curved like a dome.