Light-Shaping Optical Element With Regional Scattering Properties
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Solution Overview
Problem
Indoor lighting products face a tradeoff between light source brightness and beam shaping ability, with high brightness causing uneven light distribution and low brightness affecting effectiveness, and there is a need for a smaller-sized lighting product that combines moderate brightness with beam shaping capabilities.
Innovation Solution
A light-emitting arrangement featuring a scattering member with different optical characteristics arranged in a three-dimensional shape in front of the light source, which allows for a larger solid angle coverage without exceeding maximum brightness levels, enabling customizable light distribution and beam shaping by optimizing forward scattering and minimizing backscattering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a scattering sheet is arranged close to the light source to reduce product size, then the solid angle coverage is increased and product size is reduced, but the brightness becomes uneven with high brightness in central portion and low brightness at edge portions
Solution Approach 1:
The scattering sheet is divided into multiple regions with different scattering properties. Central regions have different scattering characteristics compared to edge regions, allowing each area to contribute appropriately to overall brightness uniformity while maintaining compact arrangement close to the light source.
Solution Approach 2:
The scattering sheet is segmented into multiple functional zones with varying optical characteristics. This segmentation enables independent optimization of light distribution in different areas, resolving the brightness unevenness problem while maintaining small product size through close arrangement to the light source.
2Productivity
If high light source brightness is used to maintain effectiveness, then lighting effectiveness is improved, but beam shaping ability deteriorates due to uneven light distribution
Solution Approach 1:
Different regions of the scattering sheet are assigned different scattering properties to control beam shaping. This allows the system to maintain high lighting effectiveness from the bright light source while achieving desired beam shaping through localized optical characteristics that redirect light appropriately.
Solution Approach 2:
The scattering sheet acts as an intermediary between the bright light source and the required beam shaping function. It mediates the contradiction by receiving high brightness light and transforming it into evenly distributed light with controlled beam shape through its region-specific scattering properties.
3Illumination intensity
If a scattering sheet is arranged at larger distance from the light source to reduce brightness, then brightness levels are moderated, but the solid angle coverage is reduced and product size increases
Solution Approach 1:
The scattering sheet uses regional variations in scattering properties to control brightness distribution. By optimizing local scattering characteristics, the system can maintain moderate overall brightness while arranging the sheet close to the light source, thereby reducing product size without sacrificing brightness control.
Solution Approach 2:
The optical parameters of different regions of the scattering sheet are varied to achieve desired brightness modulation. This parameter variation allows the sheet to be positioned close to the light source (reducing product size) while still providing appropriate brightness levels through controlled scattering characteristics.
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 solution provides a compact lighting product with optimal brightness and beam shaping, allowing for various design applications and cost-effective manufacturing, suitable for both consumer and professional use, while avoiding glare issues and ensuring even light distribution.
Implementation Method 1
A scattering member arranged in a three-dimensional shape in front of the light source... provides a light scattering function... All light caught by the scattering member is scattered over the area of the scattering member
Implementation Method 2
Different regions of the scattering member have different optical characteristics... optimizing forward scattering and minimizing backscattering
Implementation Method 3
the light beam is first shaped, e.g. by TIR (Total Internal Reflection) collimators
Data Source
AI summary
The present invention relates to a light-emitting arrangement (20) comprising a light source (22) and a scattering member (24). The scattering member (24) is arranged in a three-dimensional shape in front of the light source (22) in a light output direction. Different regions of the scattering member have different optical characteristics to provide a desired total light output in respect of brightness level, scattering function and beam shape.