Flat Light Guide Diffuser Elements for Homogeneous Lighting
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Solution Overview
Problem
Lamp optics with lens block rasters and flat light guides often result in inhomogeneous light emission due to varying luminance across different directions and distances, leading to an uneven lighting effect.
Innovation Solution
Incorporating diffuser elements on the opposite side of the lens block raster elements on the flat light guide, which are designed to scatter light diffusely and emit it according to Lambert's law, ensuring uniform light emission independent of the viewing direction, and optionally using a reflector element to guide back any stray light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If lens block arrays are used with planar light guides, then light can be coupled out through contact areas, but the luminance is not uniform across different emission directions and distances, resulting in inhomogeneous light emission
Solution Approach 1:
The patent applies local quality by placing diffuser elements specifically at the second planar surface of the light guide opposite to the lens array contact areas. This localized modification creates different optical properties in different regions: the lens array areas maintain focused light coupling while the diffuser areas scatter light to compensate for luminance variations, achieving uniform overall emission without affecting the entire light guide structure
Solution Approach 2:
The diffuser elements act as intermediary components between the light guide and the external environment. They mediate the light emission process by scattering the light that exits the light guide, transforming the directional luminance distribution into a more uniform omnidirectional pattern that appears consistent from all viewing angles
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
The solution achieves a homogeneous light emission effect by diffusely scattering light through the lens block raster elements, resulting in a viewing direction-independent light distribution that mimics a Lambert radiator, enhancing the overall lighting uniformity.
Implementation Method 1
The diffuser elements are designed to diffusely scatter light coupled into the light guide and emit at least part of it via the opposite lens block grid element
Implementation Method 2
The diffuser elements are designed and arranged with respect to the lens block grid element opposite them such that they enable light emission across the luminaire optics according to Lambert's law
Implementation Method 3
a lens array which is arranged on one of the two planar surfaces of the light guide such that the lens array elements are in planar contact with the first planar surface
Data Source
Figure 1a~2
AI summary
Luminaire optics (2) comprising a planar light guide (3) with two opposing planar sides (30, 31), and a lens block grid (5) which is arranged on a first (30) of the two planar sides (30, 31) such that the lens block grid elements (50) of the lens block grid (5) are in planar contact with the first planar side (30), wherein the second planar side (31) has a structure with diffuser elements (7), wherein the diffuser elements (7) are each provided opposite one of the lens block grid elements (50) in order to diffusely scatter light coupled into the light guide (3) and to emit at least partially via the respective opposite lens block grid element (50).