Nested Lampshade Thermal Expansion Control
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Solution Overview
Problem
Illumination apparatuses with polycarbonate lampshades face deformation due to thermal expansion, affecting mechanical stability and optical performance under high temperatures.
Innovation Solution
A secondary lampshade with a lower thermal expansion coefficient and higher mechanical strength is used to encase the primary lampshade, preventing deformation and maintaining shape, while allowing the primary lampshade to be thinner and lighter, reducing manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a PC lampshade is used to achieve light scattering and mechanical strength, then optical performance and structural support are improved, but thermal deformation occurs under high temperature operation
Solution Approach 1:
The patent employs a nested structure where an inner PC lampshade (providing light scattering) is placed inside an outer aluminum alloy lampshade (providing thermal stability). The inner lampshade is accommodated within the outer lampshade, allowing each component to fulfill its specific function while working together to resolve the thermal deformation issue.
Solution Approach 2:
The patent creates a composite lampshade system combining two different materials: PC (polycarbonate) for optical properties and aluminum alloy for thermal stability. This composite structure allows the system to simultaneously achieve light scattering effects and resistance to thermal expansion under high temperature operation.
2Strength
If a PC lampshade is used to provide mechanical strength, then structural reinforcement is improved, but thermal expansion causes deformation over time
Solution Approach 1:
The patent employs a nested structure where an inner PC lampshade (providing light scattering) is placed inside an outer aluminum alloy lampshade (providing thermal stability). The inner lampshade is accommodated within the outer lampshade, allowing each component to fulfill its specific function while working together to resolve the thermal deformation issue.
Solution Approach 2:
The patent changes the material parameter (thermal expansion coefficient) by selecting aluminum alloy for the outer lampshade, which has a lower thermal expansion coefficient compared to PC. This parameter change ensures that the outer lampshade maintains its dimensional stability under thermal stress, thereby restraining the inner PC lampshade from deforming.
3Device complexity
If a single PC lampshade is used for both optical and mechanical functions, then device complexity is reduced, but thermal deformation adversely affects normal function
Solution Approach 1:
The patent divides the lampshade into two separate functional components: an inner PC lampshade dedicated to light scattering and an outer aluminum alloy lampshade dedicated to thermal stability and mechanical support. This segmentation allows each component to be optimized for its specific function, resolving the issue of thermal deformation affecting normal operation.
Solution Approach 2:
The outer aluminum alloy lampshade serves multiple functions: it provides thermal stability, mechanical strength, and acts as a frame for accommodating the light engine and other components. This multi-functionality compensates for the increased structural complexity by integrating several roles into a single component.
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 secondary lampshade enhances mechanical stability and prevents thermal deformation of the primary lampshade, ensuring consistent optical performance and reduced manufacturing costs.
Implementation Method 1
the lamp tube made of PC material might undergo deformation due to thermal expansion effect under a high temperature effect during the operation of the illumination apparatus
Data Source
AI summary
The present invention relates to an illumination apparatus (100) comprising a light engine (3) and a first lampshade (1) for accommodating the light engine (3), wherein the first lampshade (1) has a first expansion coefficient, wherein the illumination apparatus (100) further comprises a second lampshade (2) for accommodating the first lampshade (1), wherein the second lampshade (2) has a second expansion coefficient smaller than the first expansion coefficient, and is configured such that the changes in size or shape of the first lampshade (1) can be restrained under a high temperature.