LED Illumination Device with Movable Light Adjustment Member
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current LED illumination devices face limitations in light output, temperature-related lifespan, color quality instability, and high costs due to the need for complex color control electronics and sensors, which affect their efficiency and performance.
Innovation Solution
The development of a light emitting device using LEDs within a light mixing cavity with wavelength converting materials like phosphors, where a movable light adjustment member alters the light's shape and color by adjusting the exposure of these materials, and a heat sink with reflective side walls to enhance thermal conductivity and light distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If LED illumination devices use complex color control electronics and sensors to maintain color point, then color quality stability is improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts the color control function from complex electronics and sensors, replacing it with a passive optical filter wheel system. The filter wheel contains pre-selected filters with specific spectral transmission characteristics that passively control the color point without requiring active sensing or complex control circuits.
Solution Approach 2:
The patent uses inexpensive optical filters on a rotatable wheel instead of expensive sensors and control electronics. These filters are simple optical elements that can be easily replaced if needed, providing cost-effective color control without requiring sophisticated electronic systems.
2Illumination intensity
If LED illumination devices increase light output, then illumination intensity is improved, but temperature of LED chip increases affecting lifespan
Solution Approach 1:
The patent segments the illumination function by introducing a filter wheel that can select different spectral components. This allows the system to operate at higher LED power levels while using filters to select only the desired wavelength ranges, thereby managing thermal load while maintaining illumination intensity.
Solution Approach 2:
The patent changes the operational parameters by using optical filters to select specific wavelength bands. This enables the LED to operate at higher currents and temperatures for increased light output, while the filters ensure only the desired spectral components reach the output, effectively decoupling light output from unwanted thermal effects.
3Reliability
If LED illumination devices use wavelength converting materials to improve color quality, then color rendering is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent uses pre-manufactured optical filters with precisely controlled spectral characteristics as substitutes for complex phosphor patterns. These filters are manufactured with high precision using established optical coating techniques, eliminating the need for complex phosphor placement and patterning processes.
Solution Approach 2:
The patent replaces the mechanical challenge of precise phosphor placement with a simpler optical filter system. The filters are mounted on a rotatable wheel using standard mechanical mounting, which is much more straightforward than attempting to precisely position and pattern phosphor materials on the LED package.
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 solution improves light output, stability, and color quality, while reducing costs by allowing for adjustable color point and beam width, enhancing thermal management, and providing a more uniform light distribution.
Implementation Method 1
A light emitting device is produced using one or more light emitting diodes within a light mixing cavity
Implementation Method 2
One or more wavelength converting materials, such as phosphors, are located at different locations of the cavity
Implementation Method 3
The temperature of the LED chip is determined by the cooling capacity in the system
Implementation Method 4
a heat sink with reflective side walls to enhance thermal conductivity and light distribution
Data Source
AI summary
A light emitting device is produced using one or more light emitting diodes within a light mixing cavity formed by surrounding sidewalls. The light emitting device includes a light adjustment member that is movable to alter the shape or color of the light produced by the light emitting device. For example, the light adjustment member may alter the exposure of the wavelength converting area to the light emitted that is emitted by the light emitting diode in the light mixing cavity. Alternatively, the height of a lens may be adjusted to change the width of the beam produced. Alternatively, a movable substrate with areas of different wavelength converting materials may adjustably cover the output port of the light mixing cavity to alter the color point of the light produced.