Mixed Light Arrangement with Segmented Conversion Elements
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Solution Overview
Problem
Current flash light systems for cameras and mobile telephone cameras face challenges in generating mixed light with precise chromaticity coordinates, leading to inadequate color reproduction due to deviations from the surrounding light's chromaticity, which can result in errors in white balance and overall picture detail.
Innovation Solution
The arrangement comprises three semiconductor chips emitting in the blue spectral range, each with different conversion elements that convert primary radiation into secondary radiation, producing a mixed light with specific chromaticity coordinates by regulating the mixture ratio of luminescent materials, ensuring a broadband emission spectrum with consistent intensity across a wide wavelength range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional flash light systems use single or simple multi-LED configurations, then device complexity is reduced, but chromaticity precision and color reproduction accuracy deteriorate
Solution Approach 1:
The flash light system is divided into three separate devices, each containing a blue semiconductor chip and a specific conversion element. This segmentation allows each device to be optimized for a particular color temperature range (4500-6500K, 10000-20000K, or 2500-3500K), enabling precise chromaticity control while maintaining manageable complexity through modular design
Solution Approach 2:
Each device uses composite material structures combining blue semiconductor chips with specific conversion elements (phosphors or quantum dots). The conversion elements are formulated with precise compositional ratios to emit at specific wavelengths when excited by blue light, achieving accurate chromaticity coordinates through material composition rather than complex optical systems
2Adaptability or versatility
If flash light systems use broadband emission to improve color reproduction, then emission spectrum width increases, but intensity consistency across wavelengths becomes difficult to maintain
Solution Approach 1:
Each of the three devices is designed with specific local quality characteristics, emitting in different portions of the visible spectrum with optimized intensity profiles. The first device targets 4500-6500K color temperature range, the second targets 10000-20000K, and the third targets 2500-3500K, ensuring that each contributes balanced intensity in its designated spectral region while collectively providing broadband coverage
Solution Approach 2:
The system dynamically controls the intensity contribution of each device through independent current regulation. By adjusting the drive current to each semiconductor chip, the system can optimize the intensity balance across the broadband spectrum in real-time, maintaining consistent overall illumination while adapting to different photographic requirements
3Manufacturing precision
If flash light chromaticity is adjusted to match surrounding light for improved white balance, then color reproduction accuracy improves, but the ability to provide consistent flash illumination deteriorates
Solution Approach 1:
The system dynamically adjusts the relative intensity contributions of the three devices based on the required chromaticity output. By independently controlling the drive currents to each semiconductor chip, the system can adaptively match the chromaticity of surrounding light conditions while maintaining sufficient total illumination intensity for proper exposure, resolving the conflict between chromaticity matching and illumination consistency
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 enables improved color reproduction by adapting the flash light's chromaticity to match the surrounding light, providing a broad emission spectrum with consistent intensity, thus enhancing the accuracy of color representation in photographs.
Implementation Method 1
having a first conversion element for generating a first secondary radiation from the first primary radiation
Implementation Method 2
Arranged in the light paths of the individual semiconductor chips are different conversion elements having luminescent materials or mixtures thereof which are configured to convert primary radiation into secondary radiation
Data Source
AI summary
The invention relates to an arrangement for generating mixed light, which comprises three semiconductor chips, emitting in the blue spectral range, of three devices. Arranged in the light paths of the individual semiconductor chips are different conversion elements which are configured to convert primary radiation into secondary radiation. The total radiation (S1, S2, S3) exiting the respective devices (10, 20, 30) has a corresponding chromaticity coordinate on the black body curve of the CIE color diagram 1931 or lies within a color quadrilateral of the CIE color diagram.