Dual-Reflector LED Optical System for Chip-on-Board Heat and Light Management

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Solution Overview

Problem

Conventional LED area light fixtures using discrete LED chips are inefficient, costly, and generate excessive heat, while chip-on-board LED packages are difficult to design for due to their non-point source nature, leading to inefficient light distribution.

Innovation Solution

A dual-reflector assembly is used within a luminaire housing, comprising an upper and lower reflector with light sources positioned between them, allowing for efficient light distribution and heat management, with the reflectors' shape and orientation derived from a method involving a rotational axis and peak angle to achieve desired illumination patterns.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If discrete LED chips are bundled together to form conventional LED light fixtures, then sufficient light output is achieved, but manufacturing cost increases and efficiency decreases

Engineering Contradiction:
Improvelight outputVSAvoidmanufacturing cost
Core Design Contradiction:
PowerVSEase of manufacture

Solution Approach 1:

The patent merges multiple LED chips onto a single substrate to create a chip-on-board LED package, consolidating what would traditionally require numerous discrete chips into one integrated unit. This reduces the total number of components needed in the luminaire while maintaining sufficient light output, thereby lowering manufacturing costs and improving efficiency

Inventive Principle:
Principle #5Merging (Combining)

2Illumination intensity

If discrete LED chips are used in conventional LED fixtures, then light distribution can be achieved, but the number of LEDs and optics increases manufacturing complexity

Engineering Contradiction:
Improvelight distributionVSAvoidnumber of LEDs and optics
Core Design Contradiction:
Illumination intensityVSDevice complexity

Solution Approach 1:

By integrating multiple LED chips onto a single substrate with integrated optics, the patent reduces the total component count. Instead of requiring individual optics for each discrete chip, the chip-on-board design consolidates optical elements, thereby simplifying the overall device structure while maintaining effective light distribution

Inventive Principle:
Principle #5Merging (Combining)

3Ease of manufacture

If chip-on-board LED packages are used, then manufacturing cost is reduced and efficiency is improved, but optical design becomes very difficult due to non-point source nature

Engineering Contradiction:
Improvemanufacturing costVSAvoidoptical design complexity
Core Design Contradiction:
Ease of manufactureVSDevice complexity

Solution Approach 1:

The patent segments the optical system into multiple reflectors (upper and lower reflectors) with specific geometric configurations. This segmentation allows each reflector to be optimized for specific light redirection tasks, making the overall optical design manageable despite the non-point source nature of chip-on-board LEDs. The segmented approach enables effective light distribution while maintaining manufacturing cost advantages

Inventive Principle:
Principle #1Segmentation

4Ease of manufacture

If conventional LED fixtures with discrete chips are used, then optical design is easier for point sources, but heat dissipation becomes problematic

Engineering Contradiction:
Improveoptical design easeVSAvoidheat dissipation
Core Design Contradiction:
Ease of manufactureVSTemperature

Solution Approach 1:

By merging multiple LED chips onto a single substrate, the patent creates a consolidated heat generation point that can be more effectively managed through integrated thermal pathways. The substrate serves as a common thermal management platform, allowing for more efficient heat dissipation compared to numerous discrete chips scattered throughout the luminaire, thereby reducing thermal issues while maintaining optical design simplicity

Inventive Principle:
Principle #5Merging (Combining)

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 dual-reflector assembly enhances light distribution efficiency, reduces manufacturing costs, and effectively manages heat, making chip-on-board LED packages viable for high-power LED area lighting systems.

Implementation Method 1

A LED area light fixture includes a dual-reflector assembly that includes an upper reflector, a lower reflector, and one or more light sources

Methodology Applied
Scientific EffectReflection: Reflection

Data Source

PatentUS9159521B1LED area lighting optical system
Publication Date: 2015.10.13 SIGNIFY HOLDING BV
  • US9159521B1 patent drawing
  • US9159521B1 patent drawing
  • US9159521B1 patent drawing

AI summary

A dual-reflector assembly includes an upper reflector and a lower reflector. The upper reflector includes a proximal end and a distal end. The lower reflector includes a proximal end and a distal end. A light source is positioned between the proximal ends of the upper reflector and the lower reflector. The upper reflector surrounds at least a portion of the lower reflector. The shape and orientation of the dual-reflector assembly can be formed by placing a cup reflector having an upper edge profile and a lower edge profile a predetermined distance away from a rotational axis and at a desired orientation, rotating the cup reflector around the rotational axis, obtaining the shape and orientation of the upper reflector and the lower reflector from the rotating upper edge profile and the rotating lower edge profile, respectively.