Compact Wallwasher Using Curved Reflector and Diffuser for Uniform Light
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Solution Overview
Problem
Existing wallwashers face challenges in achieving even, homogeneous lighting on a wall area while maintaining a compact design, as smaller luminaire dimensions lead to uneven light distribution.
Innovation Solution
The solution involves using LEDs arranged one behind the other with a concave reflector and an additional diffuser below the lighting means, where the diffuser extends to the reflector and is aligned perpendicularly, creating a mixing chamber for optimal light distribution, and a reflector with greater curvature in the upper area to efficiently direct light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the luminaire dimensions are reduced to make it more compact, then the compactness is improved, but the light distribution uniformity deteriorates
Solution Approach 1:
The patent employs a concave reflector with a specifically curved surface to redirect light from LEDs arranged in a line. The curvature of the reflector surface is optimized to distribute light uniformly across the target wall area, compensating for the limited space in compact luminaires. This curved optical surface enables effective light mixing and redirection without requiring a large luminaire volume.
Solution Approach 2:
The patent applies a diffuser element at specific locations within the luminaire, particularly where light from the LEDs first strikes the reflector or where light paths converge. This localized application of diffusing material creates optimal light mixing in critical zones, ensuring uniform light distribution on the wall while maintaining overall compact dimensions.
2Volume of moving object
If LEDs are arranged in a compact configuration, then the luminaire size is reduced, but the light distribution homogeneity worsens
Solution Approach 1:
The concave reflector surface is specifically shaped to receive light from compactly arranged LEDs and redistribute it uniformly. The curvature profile is designed to equalize light intensity across the illuminated wall area, transforming the inherently non-uniform emission from line-shaped LEDs into a homogeneous light field despite the compact LED arrangement.
Solution Approach 2:
The patent introduces a diffuser as an intermediary element between the LEDs and the final light output. This diffuser material scatters and mixes the light from the compact LED array, creating a uniform light distribution pattern on the wall. The diffuser acts as a mediator that transforms the concentrated light from small LED spacing into a homogeneous illumination field.
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 ensures a uniform and homogeneous light field on the wall, even in compact luminaire designs, by ensuring all light is influenced by the diffuser and reflector, eliminating irregularities and achieving desired light distribution.
Implementation Method 1
the light emitted by these LEDs is reflected back by means of a concave reflector in such a way that the light is emitted laterally downwards
Implementation Method 2
a third essential measure according to the invention is the arrangement of a diffuser below the light source, extending to the reflector. It has been shown that the use of this additional diffuser virtually eliminates irregularities in the light distribution and ultimately results in a very homogeneous light field
Data Source
Figure 1~2
Figure 3~4
AI summary
In the case of a lighting fixture (100) with lighting means having LEDs (5) arranged one behind the other in the longitudinal direction (I) of the lighting fixture (100) and a reflector (10) which is concave in a plane perpendicular to the longitudinal direction (I) of the lighting fixture (100), the lighting means are arranged in the upper region (11) of the reflector (10) such that they emit light onto the reflector (10) in essentially the opposite direction from a light emission direction (A) of the light fitting (100), wherein a diffuser (20) is arranged below the lighting means and extends as far as the reflector (10).