High Intensity White Light Source With Beam Shaping
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Solution Overview
Problem
Existing high-intensity white light sources are inefficient and often rely on mechanical components, which reduce reliability, and struggle to maintain uniform color distribution across illuminated areas.
Innovation Solution
A white light source comprising a first light source, a reflecting wavelength converting element, and a second blue light source, where the intensity profile of the blue light is adjusted to match the converted light, ensuring uniform white light generation with a substantially uniform color point through a beam shaping element and optical elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a luminescent converter based light source is used to convert shorter wavelength light to longer wavelengths, then white light is generated, but the system becomes inefficient and cannot achieve extremely high intensities
Solution Approach 1:
The invention divides the white light generation into two separate paths: one path converts UV/blue light to yellow light using a luminescent converter, while another path directly provides blue light. These two light paths are then combined to create white light. This segmentation allows each path to be optimized independently, achieving high intensity while maintaining efficiency.
2Illumination intensity
If a high intensity laser beam is focused on a rotating phosphor wheel, then high intensity white light is obtained, but the mechanical moving part reduces the reliability of the system
Solution Approach 1:
The invention replaces the mechanical rotating phosphor wheel with a stationary luminescent converter. UV/blue light from LEDs is directed onto the stationary converter, which converts the light to yellow. This eliminates mechanical moving parts entirely, significantly improving system reliability while maintaining high intensity white light output.
3Stability of the object's composition
If additional blue light component is added to provide high intensity white light, then color uniformity is improved, but the device complexity increases
Solution Approach 1:
The invention merges the converted yellow light with direct blue light from LEDs through optical combining elements. By integrating these two light components in a compact optical arrangement, the system achieves uniform white light with consistent color properties while avoiding excessive device complexity.
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 high-intensity, uniform white light with minimal color deviation across illuminated areas, allowing for color tunability and improved reliability by avoiding mechanical moving parts and enhancing light conversion efficiency.
Implementation Method 1
a reflecting wavelength converting element arranged to receive the first light from the first light source and at least partly convert it to converted light
Implementation Method 2
a beam shaping element adapted to adjust the intensity profile of the blue light emitted by the second light source to match the intensity profile of the converted light
Implementation Method 3
an optical element adapted to re-direct the UV, violet or blue light and blue light, and transmit converted light
Data Source
AI summary
A white light source (100) comprising a first light source (102) adapted to emit first light, a reflecting wavelength converting element (108) arranged to receive first light from the first light source (102) and at least partly convert it to converted light, and a second light source (104) adapted to emit blue light which in use combines with the converted light to generate white light. The white light source further comprises a beam shaping element (116) adapted to adjust the intensity profile of the blue light emitted by the second light source (104) to match the intensity profile of the converted light. Thereby, a white light source (104) which generates a high intensity uniform white light with a desired color distribution is provided.