Cylindrical Light Guide With Inclined Side For LED Color Mixing
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Solution Overview
Problem
Existing LED lighting arrangements face challenges in effectively influencing light output and achieving homogeneous color mixing, particularly due to the high direct component and low controllability of light emission, which results in disruptive scattered light and inadequate color mixing in narrow-beam distributions.
Innovation Solution
A specially designed cylindrical light guiding element with a partially inclined side and structured lateral surface, combined with a pot-shaped reflector, allows for efficient light guiding and mixing of light emitted by LEDs, enabling targeted light direction and color mixing through scattering structures and reflective surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If LEDs are used as light sources, then energy efficiency and directional light emission are improved, but light control flexibility and color mixing capability deteriorate
Solution Approach 1:
A light guide element is introduced as an intermediary component between the LED light source and the reflector. This light guide element with its inclined lateral surface acts as a mediator that redirects light paths, enabling flexible light control and effective color mixing while maintaining the energy efficiency benefits of LED sources
2Device complexity
If a simple reflector is used with LED, then device complexity is reduced, but light distribution control and color mixing effectiveness deteriorate
Solution Approach 1:
The light guide element features a specifically designed inclined lateral surface with local variations in geometry. This local quality modification at the light guide-reflector interface enables effective light distribution control and color mixing while keeping the overall device structure relatively simple
3Illumination intensity
If narrow-beam light distribution is achieved, then light directionality is improved, but scattered light control and color mixing deteriorate
Solution Approach 1:
The light guide element employs an asymmetrical design with an inclined lateral surface rather than a symmetrical cylindrical shape. This asymmetry enables the system to achieve narrow-beam directionality while simultaneously controlling scattered light and facilitating color mixing through the specific angular geometry of the light guide-reflector interface
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 configuration enables effective light output control and homogeneous color mixing, utilizing all emitted light while allowing for adjustable light distribution and color temperature, suitable for applications like LED spotlights.
Implementation Method 1
a light guide element made of a transparent material arranged upstream of the light source in the direction of emission
Implementation Method 2
the side of the cylinder opposite the light entry surface is at least partially inclined with respect to a longitudinal axis of the cylinder in such a way that it is permeable to part of the light and reflective to another part of the light
Implementation Method 3
the light entry surface of the light guide element is provided with a scattering structure, in particular a microstructure
Implementation Method 4
a reflector surrounding the light guide element
Data Source
Figure 1~3
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Figure 7~8
AI summary
An arrangement (1) for emitting light has at least one substantially punctiform light source (5), a light-guiding element (10), arranged in front of the light source (5) in the emission direction, made of a transparent material and a reflector (5) surrounding the light-guiding element (10). The light-guiding element (10) has a substantially cylindrical design, with one end face of the cylinder forming a light-entry surface (11), the side of the cylinder lying opposite the light-entry surface being at least partly angled with respect to a longitudinal axis (I) of the cylinder such that it is permeable to part of the light and reflective to another part of the light, and the lateral face (18) of the cylinder being provided with structures (19) for coupling light out.