LED Light-Beam Shaper Lens for Uniform Street Lighting
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Solution Overview
Problem
Existing street lighting systems face challenges in providing uniform and efficient lighting along lengthy road surfaces while minimizing maintenance, wind sensitivity, and costs, and adhering to lighting regulations to prevent dazzling and sky pollution.
Innovation Solution
An optical device with a lens having an entry diopter and an exit diopter comprising convergent and divergent sections is used to shape a round light beam into an elongate beam, allowing for the use of LEDs and reducing the need for bulky reflectors, thus creating a thin luminary head with improved lighting uniformity and reduced maintenance requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional light sources (high intensity discharge lamps, fluorescent balloons or tubes) are used, then sufficient lighting intensity is achieved, but the luminary heads become bulky and require frequent maintenance
Solution Approach 1:
The patent changes the physical parameters of the light beam by using an optical device with a specific lens design (entry diopter and exit diopter with convergent and divergent sections) to transform the light beam from a conventional round shape to an elongate shape. This parameter change allows the use of smaller, simpler light sources while maintaining sufficient illumination intensity over extended areas.
Solution Approach 2:
The patent replaces the mechanical/reflector-based light distribution system with an optical lens system. Instead of using bulky reflectors to direct light, the invention uses a lens with specific diopter configurations to shape and redirect the light beam, eliminating the need for complex mechanical light-directing components.
2Area of stationary object
If reflector systems are used to provide an elongate beam, then lighting coverage is improved, but the luminary heads become bulky and wind sensitivity increases
Solution Approach 1:
The patent substitutes the mechanical reflector system with an optical lens system. The lens with its entry and exit diopters optically shapes the light beam into an elongate form, achieving the same lighting coverage function without the bulky mechanical reflector structures that increase wind sensitivity.
Solution Approach 2:
The invention changes the geometric parameters of the light beam using the optical lens system. The lens transforms the light distribution pattern and beam shape through its specific diopter configuration, achieving elongate beam formation without requiring bulky physical structures.
3Productivity
If street luminaries are installed close to the road for better coverage, then lighting efficiency improves, but safety risks increase due to traffic
Solution Approach 1:
The patent extends the lighting coverage in the longitudinal dimension by creating an elongate light beam that stretches along the road direction. This dimensional extension allows the luminaries to be positioned farther from the road while still providing adequate lighting coverage, thereby improving safety without sacrificing lighting efficiency.
4Ease of manufacture
If conventional round light beams are used, then simple light source design is maintained, but lighting uniformity along the road is insufficient
Solution Approach 1:
The patent replaces the simple but ineffective round beam approach with an optical lens system that actively shapes the light beam. The lens with its specific diopter configuration optically transforms the light distribution to achieve uniform illumination along the road, maintaining manufacturing simplicity while dramatically improving lighting uniformity.
Solution Approach 2:
The invention changes the spatial distribution parameters of the light beam using the optical lens. By transforming the beam from a round cross-section to an elongate shape with controlled intensity distribution, the system achieves uniform lighting along the road while keeping the light source design relatively simple.
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 provides homogeneous and efficient lighting along road surfaces with reduced wind sensitivity and lower operating costs, while meeting lighting regulations by redistributing light flux to create a symmetrical elongate beam, enhancing lighting uniformity and reducing glare and sky pollution.
Implementation Method 1
an optical device for imparting an elongate shape to a light beam, also called a light-beam shaper, said optical device comprising a lens having (i) an entry diopter and (ii) an exit diopter
Data Source
AI summary
The invention relates to an optical device for imparting an elongate shape to a light beam emitted by a LED, and to street luminaries which comprise such optical devices. The optical device comprises a lens (2) having an entry diopter (3) and an exit diopter (4) which comprises a first convergent section, a second convergent section and a divergent section bridging said first and second convergent sections.