LED Light Source Unit With Fluorescent Layer For Uniform Road Illumination
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Solution Overview
Problem
Existing road illumination devices using LED units face challenges such as high replacement costs, low illumination efficiency, and the need for uniform light distribution across the entire road.
Innovation Solution
A light source unit featuring a fluorescent printed wiring board with LED elements and a light-transmissive cover shaped to diffuse and distribute light in a batwing-type illuminance pattern, allowing for adjustable light distribution without replacing the entire device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If LED units are used to reduce power consumption and extend life, then energy efficiency and durability improve, but illumination efficiency and uniform light distribution deteriorate
Solution Approach 1:
The patent segments the illumination function into two parts: LED elements for light generation and a fluorescent layer for light conversion and redistribution. This segmentation allows each component to optimize its function - LEDs provide long-life low-power illumination while the fluorescent layer ensures uniform light distribution across the road surface.
Solution Approach 2:
The fluorescent layer acts as an intermediary between the LED light source and the road surface. It receives light from the LEDs, converts wavelengths through fluorescence, and redistributes the light uniformly across the illumination area, thereby improving overall illumination efficiency while maintaining the energy-saving benefits of LED technology.
2Illumination intensity
If the entire road illumination device is replaced to achieve desired light distribution, then uniform illumination improves, but cost and labor increase
Solution Approach 1:
The patent divides the illumination device into replaceable modules - specifically the light source unit containing LEDs and fluorescent layer, and the housing. This allows replacement of only the light distribution adjustment portion rather than the entire device, reducing maintenance time and cost while achieving desired uniform light distribution.
Solution Approach 2:
The patent enables dynamic adjustment of light distribution characteristics by replacing different light source units with varying fluorescent layer configurations. This allows the system to adapt to different illumination requirements without replacing the entire housing structure, minimizing maintenance interruption time.
3Area of stationary object
If illumination angle is widened to 60° to 65° to illuminate peripheral regions, then illumination range expands, but illumination uniformity deteriorates
Solution Approach 1:
The fluorescent layer is designed with spatially varying properties - different regions of the layer have different fluorescent characteristics to compensate for the wide illumination angle. This local quality variation ensures that light intensity remains uniform across the entire illumination area from directly below to peripheral regions, even at 60° to 65° coverage angles.
Solution Approach 2:
The patent addresses the two-dimensional challenge of wide-angle uniform illumination by introducing a third dimension - the vertical thickness and optical properties of the fluorescent layer. By optimizing the layer's thickness and fluorescent material distribution through the depth dimension, uniform light distribution is achieved across the wide angular range.
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 high illumination efficiency and uniform light distribution across the road, reducing costs and labor associated with frequent replacements, while meeting higher standards for road illumination.
Implementation Method 1
the printed wiring board has a fluorescent layer containing fluorescent particles on a surface on which the light emitting diode elements are mounted
Implementation Method 2
the light distribution adjustment portion includes a portion having a convex shape outward from the board side, is spaced apart from the plurality of light emitting diode elements and from the fluorescent layer, commonly covers the plurality of light emitting diode elements and the fluorescent layer, and diffuses and distributes emission light from the light emitting diode elements and luminescence from the fluorescent layer
Data Source
AI summary
A light source unit includes a light emitting module which has a printed wiring board and a plurality of light emitting diode elements mounted on the board, and a light-transmissive light distribution adjustment portion which covers the light emitting module, in which the board has a fluorescent layer containing fluorescent particles over a surface on which the light emitting diode elements are mounted, and the light distribution adjustment portion includes a portion having a convex shape outward from the board side, is spaced apart from the plurality of light emitting diode elements and from the fluorescent layer, commonly covers the plurality of light emitting diode elements and the fluorescent layer, and diffuses and distributes emission light from the light emitting diode elements and luminescence from the fluorescent layer.