Curved Reflector Light Emission Arrangement for Uniform Wall Illumination
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Solution Overview
Problem
Conventional wallwashers with trough reflectors produce brightness distributions that have a strong maximum in the central area of illumination, with a significant drop in brightness to the sides and below, offering limited control over the distribution for uniform illumination.
Innovation Solution
A light emission arrangement featuring a light source emitting light away from the surface, utilizing a reflector to achieve a substantially uniform back reflection onto the surface, with a free-form design allowing curvature in multiple directions to efficiently influence brightness distribution, and LEDs covered with color conversion material to ensure even illumination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a trough reflector is used to illuminate a wall, then light can be directed towards the wall, but the brightness distribution has a strong maximum in the central area with significant drop to the sides and below
Solution Approach 1:
The patent employs a curved reflector surface with specific radii of curvature in orthogonal directions (Rx and Ry) to transform the light distribution pattern. The curved geometry redirects light rays that would otherwise concentrate in the center, spreading them more evenly across the wall surface to eliminate the bright central maximum and improve lateral uniformity.
Solution Approach 2:
The patent modifies the geometric parameters of the reflector, specifically the radii of curvature Rx and Ry, to control the light distribution characteristics. By adjusting these curvature parameters, the system achieves uniform brightness distribution across the illuminated wall area, transforming the problematic concentration pattern into an even distribution.
2Use of energy by moving object
If LEDs are used as light source, then energy efficiency is improved, but individual luminous points create local brightness maxima on the illuminated surface
Solution Approach 1:
The patent introduces a color conversion layer as an intermediary between the LED light source and the wall surface. This layer serves dual functions: converting the LED wavelength to the desired color temperature and acting as a diffusing medium that blends the discrete LED emission points into a continuous, uniform light source, thereby eliminating local brightness maxima.
Solution Approach 2:
The patent utilizes color conversion materials to transform the spectral characteristics of LED light. By converting the narrow-spectrum LED emission into broad-spectrum white light with desired color temperature, the system achieves both energy efficiency and uniform illumination, as the color conversion process inherently smooths out the spatial distribution of light.
3Illumination intensity
If light is emitted directly towards the wall, then illumination is achieved, but brightness distribution cannot be uniformly controlled
Solution Approach 1:
The curved reflector geometry provides versatile control over light distribution by redirecting emitted light at various angles. The specific curvature radii enable the system to adapt the brightness distribution across different regions of the wall, achieving uniform illumination while maintaining the ability to influence the distribution pattern as needed.
Solution Approach 2:
Instead of directing light directly at the wall and attempting to control distribution, the patent inverts the approach by emitting light away from the wall and using a reflector to redirect it. This back-reflection method provides superior control over brightness distribution, as the reflector geometry can be precisely designed to achieve uniform illumination across the entire wall surface.
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 arrangement enables more controlled and uniform illumination of wall areas, preventing local brightness maxima and allowing for efficient adjustment of brightness distribution, resulting in a more even and aesthetically pleasing lighting effect.
Implementation Method 1
a reflector which is arranged and designed in such a way that the light beams originating from the light source and incident on the reflector are reflected back onto the surface to be illuminated in a substantially uniformly distributed manner
Implementation Method 2
the plurality of LEDs being covered by a color conversion material
Data Source
AI summary
An arrangement for emitting light (1) is designed to be secured on a support element, for example a room ceiling (102), which extends on a first plane, and to illuminate a surface (110), which extends on a second plane that extends substantially perpendicularly to the first plane. The arrangement has a light source (10) which emits light in a direction facing away from the surface (110) to be illuminated and a reflector (20) which is arranged and designed such that the incident light beams from the light source (10) are substantially reflected in a uniformly distributed manner towards the surface (110) to be illuminated.