Light Fixture Shield for Heat Dissipation and Debris Protection
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Solution Overview
Problem
High-luminance LED light fixtures face challenges in heat dissipation and the need to isolate LEDs from flammable objects to prevent damage and maintain light distribution characteristics, while also requiring cost-effective solutions for high-volume applications.
Innovation Solution
The use of a light-transmissive shield member secured to the optical member, which facilitates unobstructed light distribution, minimizes damage to exterior surfaces, and maintains thermal performance by optimizing the distance between the shield and optical member, using a combination of spacers, gaskets, and mounting brackets for secure attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a light-transmissive shield member is added to protect the optical member, then protection from debris and heat isolation is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The shield member integrates multiple functions into a single component: it provides debris protection, heat isolation, and structural support while maintaining light transmission. The mounting brackets and spacers are designed as integrated assemblies that attach the shield to the optical member, reducing the need for separate protective components.
Solution Approach 2:
The light-transmissive shield member serves multiple purposes simultaneously: protecting the optical member from debris impact, isolating heat from flammable objects, maintaining structural integrity, and preserving light distribution characteristics. This multi-functionality justifies the added complexity by eliminating the need for multiple separate components.
2Reliability
If spacers and mounting brackets are used to secure the shield member, then protection and heat dissipation are improved, but manufacturing cost increases
Solution Approach 1:
The protective assembly is divided into modular components: the shield member, mounting brackets, spacers, and fasteners. This segmentation allows each component to be manufactured independently using optimized processes, facilitating mass production and reducing overall manufacturing cost despite the increased number of parts.
Solution Approach 2:
The design optimizes the spacing and mounting parameters to achieve effective heat dissipation and protection while minimizing material usage. The spacers are dimensioned to provide adequate clearance for heat management, and the mounting brackets are designed for efficient assembly, reducing manufacturing complexity and cost.
3Temperature
If the shield member is positioned close to the optical member, then heat dissipation is improved, but light distribution may be obstructed
Solution Approach 1:
The shield member is designed with varying properties: it is light-transmissive in the regions where light passes through, providing protection without obstructing light distribution. The mounting brackets and spacers are positioned at specific locations that maintain adequate clearance between the shield and optical member, ensuring heat dissipation while preserving optical performance.
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 configuration enhances heat dissipation, prevents damage from debris, and maintains intended light distribution patterns, extending the life of LED light fixtures while controlling costs in high-volume applications.
Implementation Method 1
The light-transmissive shield member serves to facilitate unobstructed distribution of light
Implementation Method 2
The optical member is configured for distribution of emitted light
Data Source
AI summary
A light-emitting arrangement including an optical member and a light-transmissive shield member secured with respect to the optical member at least partially defines a light-fixture exterior and having a back side facing a circuit board and receiving a gasket which encircles the circuit board to provide a water seal thereabout. The gasket has a pair of spaced apart outwardly-extending lateral fingers engaging lateral sides of a recess formed by the optical-member back side, and at least one inner finger extending into the recess offset from the recessed lateral sides. A peripheral wall extends from the optical-member back side outwardly around the gasket and engaging an emitter-supporting to minimize water ingress toward the gasket. An opaque shield is disposed along at least a portion of a perimeter of the optical member and configured and dimensioned to minimize or block distribution of light in at least one direction opposite the direction of the primary illumination.