Catadioptric LED Spotlight Light Guide and Reflector Design
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Solution Overview
Problem
Existing LED lighting devices face challenges in achieving satisfactory light distribution and intensity, particularly in applications like museum lighting, and require improvements in performance and efficiency, as well as ease of manufacture.
Innovation Solution
A catadioptric LED spotlight design featuring a supporting structure with a plane LED light source, an optical system comprising a light guide, primary and secondary reflectors, and a casing, which internally mixes and directs the light to achieve efficient and controlled light distribution, using a light guide that transmits the image of the light source and reflectors to focus the light for optimal performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional LED lighting devices are used, then the structure is simple, but the light distribution and intensity are unsatisfactory
Solution Approach 1:
The optical system is segmented into multiple functional components: a light guide (13) for transmitting and mixing light, a primary reflector (14) for redirecting light, and a secondary reflector (15) for further light control. This segmentation allows each component to be optimized for its specific function, achieving superior light distribution while maintaining manufacturability through modular assembly
Solution Approach 2:
A light guide (13) is introduced as an intermediary element between the LED light source (3) and the reflectors. This light guide transmits the image of the light source and internally mixes the light before it reaches the reflectors, enabling precise control over light distribution and intensity without requiring complex direct coupling between the LED and optical elements
2Productivity
If advanced optical systems are used to improve light distribution, then lighting performance improves, but ease of manufacture deteriorates
Solution Approach 1:
The optical system is divided into separate, easily manufacturable components (light guide, primary reflector, secondary reflector) that can be produced using standard manufacturing techniques and then assembled. This segmentation maintains high lighting performance while improving ease of manufacture compared to integrated complex optical systems
Solution Approach 2:
The light guide (13) performs multiple functions: it transmits the image of the light source, internally mixes the light, and directs the mixed light toward the reflectors. This multi-functionality reduces the need for additional specialized components, simplifying manufacturing while maintaining superior lighting performance
3Loss of energy
If complex optical components are used, then lighting efficiency improves, but device complexity increases
Solution Approach 1:
The optical system is designed to continuously guide and redirect light from the LED source through the light guide and both reflectors to the target area. This continuous optical path minimizes energy loss through multiple discrete reflections or transmissions, maintaining high lighting efficiency while using relatively simple geometric reflector surfaces that are easy to manufacture
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A LED lighting device (1) extending substantially along an axis (A) and having a LED light source (3); a light guide (13) located in front of the light source (3) and extending between a proximal end (16) substantially facing the light source (3), and a distal end (17) opposite the proximal end (16); and an optical system (5) associated with the light source (3) to direct the luminous flux emitted by the light source (3); the light guide (13) being shaped so as to generate at the distal end (17) of the light guide (13) an emissive surface equivalent to the real emitting surface of the light source (3) at a predetermined position with respect to the optical system (5).