Solid State Lighting Components with Segmented Diffusers
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Solution Overview
Problem
Solid state lighting components face challenges in providing good color rendering and uniformity while maintaining high luminous efficacy and brightness, especially in high-output applications like spotlights and high-bay lighting, where conventional solutions like ceramic discharge metal halide bulbs are costly and inefficient.
Innovation Solution
The development of solid state lighting components that include a substrate with light emitters, a light directing optic, and a diffusing optic, where the diffusing optic is positioned at a distance from the light emitter surface to improve color rendering, featuring a combination of LEDs emitting different colors to achieve a narrow or centered light beam with a high color rendering index (CRI) of approximately 80 or more.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If large form-factor diffusers are placed close to or directly on the light emitting chips, then the lighting component can be compact, but color separation, color blotches, and color rings occur
Solution Approach 1:
The patent divides the diffusing function into two separate components: a first diffuser close to the light emitters and a second diffuser farther away. This segmentation allows each diffuser to perform a specific function - the first diffuser provides initial light distribution while the second diffuser ensures color uniformity, resolving the contradiction between compact size and color uniformity.
Solution Approach 2:
The patent introduces a spatial dimension by positioning the second diffuser at a greater distance from the light emitters than the first diffuser. This dimensional arrangement allows light to travel through a longer path, enabling better color mixing and uniformity without requiring a larger overall component footprint.
2Illumination intensity
If multiple light emitters of different colors are used to improve color rendering, then color rendering index improves, but color uniformity and mixing become more difficult to achieve
Solution Approach 1:
The patent introduces diffusers as intermediary elements between the multi-color light emitters and the final light output. These diffusers act as mediators that facilitate color mixing by scattering and redistributing light from different color emitters, enabling high CRI while maintaining color uniformity.
Solution Approach 2:
By positioning diffusers at strategic distances from the light emitters, the patent creates additional spatial dimensions for light interaction. This allows light from multiple color emitters to overlap and mix more effectively, achieving uniform color output while preserving the benefits of multiple emitter colors.
3Power
If light emitters are placed in high output fixtures for spotlight and high-bay applications, then lighting output increases, but color separation and uniformity issues worsen
Solution Approach 1:
The patent segments the diffusing function into multiple stages with different diffusers positioned at different distances from the high-power light emitters. This segmentation allows the lighting component to handle high output power while maintaining color uniformity, as each diffuser stage progressively improves color mixing without overwhelming the system.
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
These components offer improved color rendering, uniformity, and efficiency, replacing traditional bulbs with a more cost-effective and environmentally friendly solution that provides a powerful, narrow light beam with enhanced color mixing and brightness suitable for high-output applications.
Implementation Method 1
The light directing optic comprising a reflective surface disposed around a perimeter of the light emitter surface
Implementation Method 2
The diffusing optic is disposed between portions of the reflective surface and over the one or more light emitters
Data Source
AI summary
Solid state lighting components are provided with improved color rendering, improved color uniformity, and improved directional lighting, and that are suitable for use in high output lighting applications and can be used in place of CDMH bulb lighting. Exemplary solid state lighting components include a substrate comprising a light emitter surface and or more light emitters disposed on and/or over the light emitter surface. Exemplary components include a light directing optic and/or a diffusing optic for mixing light. The light directing optic may be disposed at least partially around a perimeter of the light emitter surface. The diffusing optic may be disposed between portions of the light directing optic and spaced apart from the light emitter surface.