Two-Piece LED Reflector for Emergency Lighting Beam Control
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Solution Overview
Problem
Existing LED emergency lighting systems struggle to replicate the light distribution of high-power incandescent lamps, such as sealed-beam or MR16 lamps, due to limitations in power consumption and luminous flux, resulting in insufficient illumination in emergency lighting applications.
Innovation Solution
A two-piece reflector design comprising a main body reflector with a parabolic shape and a crown reflector portion that extends around the main body reflector, positioned to direct LED light emissions at specific angles, increasing the light spill and creating a beam angle of 10-30 degrees with respect to the central optical axis, mimicking the light distribution of incandescent lamps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional LED lamp assemblies are used to substitute incandescent lamps, then power consumption is reduced, but luminous flux is limited to 200-600 lumens which is insufficient for emergency lighting
Solution Approach 1:
The reflector is divided into two separate pieces: a main body reflector and a crown reflector. This segmentation allows each piece to be optimized for specific light distribution functions, enabling the LED assembly to achieve higher luminous flux and broader light distribution comparable to incandescent lamps while maintaining low power consumption
Solution Approach 2:
The crown reflector adds a new dimensional element to the light distribution by reflecting light at angles (45-90 degrees) different from the main body reflector's beam angle (10-30 degrees). This creates a multi-dimensional light distribution pattern that significantly increases overall luminous flux coverage
2Duration of action of stationary object
If LED lights are used to substitute high-power incandescent lamps, then operational life is extended, but light distribution pattern differs from conventional lamps
Solution Approach 1:
Different regions of the reflector system are designed with different optical properties. The main body reflector creates a narrow beam (10-30 degrees) for forward illumination, while the crown reflector distributes light at wider angles (45-90 degrees) for peripheral illumination. This local differentiation of optical functions recreates the omnidirectional light distribution characteristic of incandescent lamps
Solution Approach 2:
The patent combines two distinct reflector systems (main body and crown) into a single integrated lighting assembly. The merging of these two reflector types creates a composite light distribution pattern that mimics the characteristics of traditional sealed-beam or MR16 incandescent lamps, while retaining LED operational advantages
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 enhances light spill and illumination, providing a more effective light distribution similar to incandescent lamps, addressing the limitations of existing LED systems and ensuring adequate illumination in emergency lighting scenarios.
Implementation Method 1
The main body reflector portion has an inner reflective surface symmetrical about a central optical axis. The reflective surface has a first end for receiving the LED light surface and a second end opposite the first end.
Implementation Method 2
The crown reflector portion is attached to the second end of the main body reflector portion and has an inner reflective surface tilted inwardly from the second end of the main body reflector portion toward the central optical axis.
Data Source
AI summary
An emergency lighting head including an LED light surface and a reflector, wherein the reflector has a main body reflector portion and a crown reflector portion attached to the main body portion. The main body reflector portion has an inner reflective surface symmetrical about a central optical axis. The reflective surface has a first end for receiving the LED light surface and a second end opposite the first end. The crown reflector portion is attached to the second end of the main body reflector portion and has an inner reflective surface tilted inwardly from the second end of the main body reflector portion toward the central optical axis.