Movable Light Collecting Means for Compact Illumination
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Solution Overview
Problem
Existing illumination devices face challenges in achieving high lumen output and color rendering index (CRI) while being compact, due to Etendue limitations and inefficiencies in light source utilization, leading to reduced light intensity and color artifacts.
Innovation Solution
The illumination device employs two groups of light sources, with light collecting means that can be moved and fixed in different positions to selectively use either group, allowing for a high number of light sources to be integrated without exceeding Etendue limits, and enabling switching between multi-colored and white light modes for enhanced CRI and intensity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple light sources are integrated into a compact illumination device, then the lumen output and CRI are improved, but the device size increases and Etendue limitations are exceeded
Solution Approach 1:
The illumination device segments the light sources into multiple groups (e.g., RGBW LEDs and white LEDs) that can be selectively activated. The light collecting means are similarly segmented and can be positioned to collect light from different groups, allowing the device to achieve high lumen output and CRI by using multiple light source groups while maintaining a compact form factor by only activating the necessary segments for each lighting scenario.
Solution Approach 2:
The light collecting means are made movable relative to the light sources, allowing dynamic repositioning to optimize light collection from different light source groups. This dynamic capability enables the compact device to adapt its light collection geometry, effectively increasing the usable lumen output without permanently increasing device volume, while also managing Etendue by adjusting the collection angle and area as needed.
2Reliability
If multiple light sources are integrated into the illumination device, then the CRI is improved, but the light intensity is reduced due to Etendue limitations
Solution Approach 1:
The illumination device segments light sources into different functional groups (e.g., RGBW for color rendering and white LEDs for intensity). The light collecting means can be selectively positioned to collect from different groups, allowing the device to optimize for either CRI or intensity depending on the lighting scenario, thereby maintaining high light intensity while achieving improved CRI when both are needed.
Solution Approach 2:
The system changes operational parameters by selectively activating different light source groups and adjusting the position of light collecting means. This allows dynamic optimization of the balance between CRI and light intensity, enabling the device to achieve high CRI through multiple light source groups while maintaining high intensity by optimizing the light collection geometry and selecting appropriate light source combinations.
3Adaptability or versatility
If light collecting means are moved between different positions to selectively use light source groups, then the flexibility and CRI are improved, but the device complexity increases
Solution Approach 1:
The device segments both light sources and light collecting means into corresponding groups, where each light collecting means is associated with specific light source groups. This segmentation allows for simplified mechanical design where the light collecting means only need to move between predetermined positions corresponding to different light source groups, reducing the overall mechanical complexity while maintaining operational flexibility and the ability to optimize CRI.
4Productivity
If a high number of light sources are integrated, then the lumen output is improved, but the Etendue limits are exceeded leading to reduced light intensity
Solution Approach 1:
The illumination device segments light sources into multiple groups that can be selectively activated, and segments the light collecting means to correspondingly collect light from different groups. This segmentation allows the device to integrate a high number of light sources for high lumen output while managing Etendue by only collecting light from the necessary number of active light sources at any given time, thereby maintaining high light intensity.
Solution Approach 2:
The light collecting means are made dynamically repositionable to optimize light collection from different light source groups. This dynamic capability allows the compact device to adapt its light collection geometry, effectively increasing the usable lumen output without permanently increasing device volume, while also managing Etendue by adjusting the collection angle and area as needed to maintain high light intensity.
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 a compact illumination device with high lumen output and improved CRI, allowing for efficient use of multiple light sources and flexible operation between multi-colored and white light modes, addressing the limitations of prior art.
Implementation Method 1
a number of light collecting means (307) arranged in front of the light sources (303, 305) and movable and fixable in relation to the light sources (303, 305) between a first position and a second position, where the light collecting means (307) in the first position are adapted to collect light from the first group of light sources (303) and to convert the collected light into a number of first light beams (309) and where the light collecting means (307) in the second position are adapted to collect light from the second group of light sources (305) and to convert the collected light into a number of second light beams (311)
Data Source
Figure 1a~1b
Figure 2a~2e
Figure 3a
AI summary
The present invention relates to an illumination device comprising a number of light sources (867, R, G, B) generating light and a number of light collecting means (707a, 707b) adapted to collect the generated light and to convert the collected light into a number of light beams (751a, 751b) that propagate along an optical axis (713). The light sources are arranged in a first group and a second group of light sources and the first and second group of light sources emits light having different spectral distribution. The light sources and the light collecting means are movable in relation to each other and can be positioned in a number of mixing positions, where in the number of mixing positions the light collecting means are adapted to collect at least a part of the light emitted by the first group of light sources and at least a part of the light emitted by said second group of light sources and to convert the collected light into number of mixed light beams.