High Pressure Discharge Lamp Holder Heat Dissipation
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Solution Overview
Problem
High pressure discharge lamps for motor vehicle headlights face challenges in managing heat efficiently, leading to high production costs and potential optical performance issues due to the need for heat-resistant materials in the socket.
Innovation Solution
A design where the burner is supported by legs that are part of a holder with a surrounding ring, allowing heat conduction from the burner to the ring and subsequent convective cooling, enabling the use of less expensive materials and improving electromagnetic shielding and optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If heat-resistant plastic material (PPS) is used for the socket to withstand the hot burner, then the heat resistance is improved, but the manufacturing cost increases
Solution Approach 1:
The patent introduces a metal holder as an intermediary component between the burner and the plastic socket. The holder receives heat from the burner through its legs and dissipates it to the environment, protecting the plastic socket from direct thermal exposure. This allows the use of less expensive plastic materials that would otherwise be unsuitable for high-temperature environments.
Solution Approach 2:
The patent extracts the heat management function from the socket structure by introducing a separate holder component. The holder specifically handles the thermal load from the burner, while the socket focuses on electrical connection and mechanical support. This functional separation allows the socket to use cheaper materials.
2Loss of energy
If high temperature is maintained at the holder to match the burner temperature, then the heat transfer efficiency is improved, but the socket material and internal components may outgas causing optical performance degradation
Solution Approach 1:
The metal holder acts as a thermal intermediary that decouples the high-temperature burner from the low-temperature socket environment. It transfers heat away from the burner while maintaining a cooler temperature at the socket interface, preventing outgassing of materials and plastic components without compromising heat management.
3Stability of the object's composition
If the legs are positioned close to the burner for support, then the mechanical stability is improved, but the heat conduction to the ring is reduced
Solution Approach 1:
The patent extends the legs not only vertically for mechanical support but also horizontally toward the ring, creating a three-dimensional heat conduction path. This dimensional extension allows the legs to serve dual functions: providing mechanical stability close to the burner while maintaining effective thermal contact with the ring for heat dissipation.
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 reduces manufacturing costs, increases the lifespan of the lamp, and enhances optical performance by preventing gas outgassing and allowing higher voltage operation without increased electromagnetic radiation.
Implementation Method 1
the heat of the burner is conducted from the burner via the legs to the ring by heat conduction
Implementation Method 2
From the ring the heat is led away to the environment by convection
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
A high pressure discharge lamp (10), which is particularly a motor vehicle headlight, comprises a high pressure discharge burner (12) for emitting light supported by at least one leg (24), preferably three or four legs (24). By means of the legs (24) the burner (12) is mechanically connected to a socket (14) of the high pressure discharge lamp (10). According to the invention the legs (24) are part of a holder (16), which comprises further a ring (18) surrounding the socket (14), whereby the ring (18) is one- piece with the legs (24). Due to the design of the holder (16) as ring (18) with protruding legs (24) the heat of the burner (12) is conducted from the burner (12) via the legs (24) to the ring (18) by heat conduction. From the ring (18) the heat is led away to the environment by convection. This leads to a significant cooler Temperature of the holder (16) with respect to the burner (12), so that the material of the socket (14) needs not to be selected with respect to a good heat resistance. Thus, the use of more cost efficient materials is possible to deal with the hot burner (12).