Lighting Module Pitch Variation for Homogeneous Illumination
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Solution Overview
Problem
Modular lighting systems face challenges in achieving homogeneous illumination due to the perception of dark areas between adjacent modules caused by the limitations of minimum creepage and clearance distances, which restrict the arrangement of light sources near the peripheral edges, leading to discontinuities in illuminance.
Innovation Solution
The solution involves arranging light sources on a board with a smaller pitch towards the central portion and a larger pitch towards the peripheral edge, allowing for a smooth transition between modules, thereby reducing the visibility of dark areas and enhancing the homogeneity of luminance distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light sources are arranged with a small pitch on the board, then continuous illumination is improved, but dark areas become visible between adjacent modules due to minimum creepage and clearance distances
Solution Approach 1:
The patent applies local quality by varying the pitch between light sources depending on the location on the board. Specifically, the pitch is made smaller in regions closer to the peripheral edge where dark areas between modules would be visible, and larger in central regions. This non-uniform pitch distribution allows the system to maintain continuous illumination appearance while accommodating the minimum creepage and clearance distance requirements at module boundaries.
2Illumination intensity
If light sources are arranged near the peripheral edge to reduce dark areas, then homogeneity is improved, but minimum creepage and clearance distances cannot be satisfied
Solution Approach 1:
The patent resolves this contradiction by implementing local quality through position-dependent pitch variation. Light sources are arranged with smaller pitch values near the peripheral edges of the board, allowing them to be positioned closer to the edges without violating minimum creepage and clearance distances. This localized adjustment maintains electrical safety requirements while optimizing the visual homogeneity of illumination.
Solution Approach 2:
The patent applies parameter changes by modifying the pitch parameter as a function of position on the board. Rather than using a uniform pitch, the pitch is varied continuously or in steps based on the distance from the board center or proximity to peripheral edges. This parameter optimization allows the system to satisfy both the electrical clearance requirements and the optical homogeneity requirements simultaneously.
Data Source
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Figure 3
AI summary
The present invention relates to a lighting module (20a, 20b, 20c), a modular lighting system (2) and a method of manufacturing such a lighting module. The lighting module comprises a board (21) having a central portion (24) and a peripheral edge (22) adapted to be coupled to the peripheral edge of the board of another lighting module, and a plurality of light sources (23) arranged at the board such that the pitch in proximity to the peripheral edge is larger than the pitch in proximity to the central portion. The present invention is advantageous in that it enables the realization of a modular lighting system whose luminance distribution is perceived as more homogenous. The pitch between the light sources of the board can be reduced while reducing the perception of any dark areas between neighbouring lighting modules as illuminance interruptions (or discontinuities).