LED Downlight Reflector Cups for Uniform Illumination
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Solution Overview
Problem
Conventional lighting fixtures, especially those using incandescent and fluorescent lights, are energy-inefficient and require significant energy consumption, with LEDs offering improved efficiency and longer lifetimes but often resulting in bulky installations and uneven light distribution.
Innovation Solution
A lighting assembly featuring a housing with a PCB, heat sinks, and a reflector with adjustable reflector cups to direct light efficiently, using LEDs for energy efficiency and extended lifespan, and allowing for single-person installation with a compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional lighting fixtures use incandescent or fluorescent lights, then sufficient lighting can be provided, but energy consumption is high and electrical efficiency is low
Solution Approach 1:
The patent transitions from conventional incandescent and fluorescent lighting to LED technology, fundamentally changing the light generation mechanism. LEDs convert electrical energy to light through electroluminescence in semiconductor materials, achieving significantly higher energy efficiency (converting 80-90% of electrical energy to light versus 5-15% for conventional lights) while maintaining sufficient illumination intensity for various lighting applications
2Illumination intensity
If conventional lighting fixtures use multiple fluorescent tubes or high-power metal halide lights, then sufficient lighting can be provided, but the fixture size and housing volume increase
Solution Approach 1:
The patent divides the lighting function into multiple individual LED elements arranged on a circuit board within the housing. Instead of using one or two large light sources, numerous small LEDs are segmented and distributed across the fixture, achieving the required total illumination while dramatically reducing the space each individual light source occupies and allowing for a more compact overall housing design
Solution Approach 2:
The patent transitions from linear fluorescent tubes to a two-dimensional array of LED elements mounted on a circuit board. This dimensional change allows light sources to be distributed across a flat surface area rather than occupying linear space, enabling more efficient space utilization and compact housing configurations while maintaining or increasing total lighting output
3Illumination intensity
If conventional lighting fixtures use incandescent or fluorescent lights, then lighting can be provided, but heat generation is high requiring active cooling systems
Solution Approach 1:
The patent addresses heat management by designing passive heat dissipation structures that convert the harmful heat generated by LEDs into a beneficial cooling mechanism. Heat sinks with optimized fin structures and thermally conductive pathways are integrated into the housing, using natural convection and radiation to dissipate heat without requiring active cooling fans or complex thermal management systems, thus maintaining low operating temperatures while preserving LED efficiency and longevity
4Use of energy by moving object
If LED arrays are used to provide sufficient lighting, then energy efficiency is improved, but light distribution uniformity becomes problematic
Solution Approach 1:
The patent applies local quality by varying the spatial arrangement, orientation, and optical characteristics of individual LED elements and their associated reflectors within the housing. Different regions of the LED array are configured with specific beam angles, orientations, and reflector geometries tailored to achieve uniform light distribution across the target area, compensating for the inherently directional nature of individual LEDs and creating homogeneous illumination patterns
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 solution provides a cost-effective, energy-efficient, and reliable lighting solution with improved light distribution, reduced installation complexity, and extended operational lifetime of LEDs, while minimizing the need for active cooling systems.
Implementation Method 1
a reflector placed adjacent light emitting elements, wherein the reflector has a plurality of reflector cups arranged in a plurality of reflective patterns to reflect light emitted from the light emitting elements in a desired light distribution pattern
Implementation Method 2
heat sinks to dissipate heat from the light emitting elements
Implementation Method 3
LEDs are solid state devices that convert electric energy to light and generally comprise one or more active regions of semiconductor material interposed between oppositely doped semiconductor layers. When a bias is applied across the doped layers, holes and electrons are injected into the active region where they recombine to generate light
Data Source
AI summary
A lighting assembly comprising a housing including a front surface and a back surface, a plurality of light emitting elements on a printed circuit board (PCB) within said housing, and a reflector proximate the light emitting elements. The reflector comprises a plurality of reflective cups, wherein each reflective cup is configured to receive a respective light emitting element. The reflector is adapted to reflect light emitted from the plurality of light emitting elements in accordance with a desired light distribution pattern.