LED Display Case Optics for Longer Throw With Fewer LEDs
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Solution Overview
Problem
Existing LED lighting systems for refrigerated display cases have limited throw distance and efficiency, often requiring many LEDs which decreases their overall performance.
Innovation Solution
The LED lamp design features a plurality of LEDs spaced along an axis with an optic having primary and secondary reflective surfaces, allowing light to be redirected in multiple directions to achieve a broader throw and increased efficiency, while also using a mounting structure and PCB with a snap-in optic for secure attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If many LEDs are used to illuminate the display case, then the illumination coverage is improved, but the efficiency of the lighting system decreases
Solution Approach 1:
The lighting system is segmented into multiple LED modules, each with its own optic assembly. This allows the illumination task to be divided into smaller zones, each optimized for efficient light distribution. The segmentation enables better control over light paths and reduces the need for excessive LEDs to achieve comprehensive coverage.
Solution Approach 2:
The invention introduces reflective surfaces and optics that redirect light in multiple dimensions. Instead of relying solely on increasing the number of LEDs in one dimension, the system uses reflective surfaces to bounce light across the display case in various directions, achieving broader coverage through spatial redistribution rather than numerical multiplication.
2Loss of energy
If the throw distance is increased to reduce the number of LEDs, then the efficiency improves, but the illumination intensity at the target plane decreases
Solution Approach 1:
The optic assemblies incorporate reflective surfaces that redirect light at various angles, effectively extending the throw distance while maintaining illumination intensity through multi-directional light distribution. This dimensional approach to light redirection allows light to travel farther without losing intensity.
Solution Approach 2:
Each optic assembly is designed with specific reflective surfaces tailored to its location and function. The local optimization of light redirection ensures that each LED's light is efficiently distributed to the appropriate areas, maintaining intensity even at extended throw distances by adapting the light path to local requirements.
3Area of stationary object
If a complex optic structure with multiple reflective surfaces is used to achieve broader throw, then the illumination coverage improves, but the device complexity increases
Solution Approach 1:
The complex optic function is segmented into multiple simpler reflective surfaces, each performing a specific light redirection task. This segmentation breaks down the overall complexity into manageable components that are easier to manufacture and maintain, while collectively achieving the desired broad illumination coverage.
Solution Approach 2:
The optic structure employs nested reflective surfaces where smaller reflective elements are positioned within or alongside larger ones. This nesting arrangement achieves complex light redirection patterns through a compact configuration, reducing overall structural complexity while maintaining effective illumination coverage.
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 provides a broader range of throw and uses less energy compared to traditional systems, accommodating various LED devices and enhancing versatility and illumination coverage.
Implementation Method 1
The primary reflective surfaces are shaped to direct light from the respective LED away from an area of the target plane that is generally perpendicular to the mullion
Implementation Method 2
The secondary surfaces are shaped to direct light from the respective LED toward the area of the target plane that is generally perpendicular to the mullion
Implementation Method 3
At least one of the domes is arranged with respect to a respective LED to redirect light reflecting off of the respective primary reflective surface from the respective LED in a first general direction
Data Source
AI summary
An LED lamp for use in a display case includes a plurality of LEDs and an optic for redirecting the light to illuminate the contents of the display case.