Lens With Sloping Cavity For Uniform Streetlamp Illumination
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Solution Overview
Problem
Lighting apparatuses, such as streetlamps and security lights, face challenges in achieving uniform luminance and directing light efficiently to specific areas, with existing lenses failing to concentrate light effectively in central regions while maintaining uniformity in peripheral areas.
Innovation Solution
A lens design featuring a cavity with specific sloping surfaces and an inflection part, along with a light emitting unit incorporating a circuit board and light emitting device, is used to direct light emission, where the lens body's outer surface includes a reflection region and a transmission region, allowing for controlled light distribution by varying the angles and patterns on the lens surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional lens is used to direct light in a specific direction, then light concentration in the forward direction is improved, but uniformity in peripheral regions deteriorates
Solution Approach 1:
The lens applies local quality by having different surface characteristics in different regions. The central region has a first surface with specific curvature to concentrate light, while the peripheral region has a second surface with different curvature to maintain uniformity. This allows each region to perform its specific function optimally without compromising the other.
Solution Approach 2:
The lens surface is segmented into multiple regions with different optical properties. The first surface and second surface are divided into central and peripheral regions, each with independently optimized curvature radii. This segmentation enables the lens to simultaneously achieve light concentration and uniformity by treating different regions differently.
2Ease of operation
If the lens shape is optimized for directional light emission, then light directionality is improved, but light distribution uniformity deteriorates
Solution Approach 1:
Different regions of the lens are assigned different optical functions. The central region is optimized for directional light emission with appropriate curvature, while the peripheral region is optimized for uniform light distribution. This local differentiation resolves the contradiction between directionality and uniformity.
Solution Approach 2:
The solution moves from a single-surface lens to a two-surface lens system, adding another dimension of optical control. By independently optimizing the first and second surfaces with different curvature radii in central and peripheral regions, the patent achieves both directional emission and uniform distribution through multi-dimensional parameter control.
3Ease of operation
If a secondary lens is added to adjust light emission path, then light path control is improved, but device complexity increases
Solution Approach 1:
The patent merges the functions of multiple lenses into a single integrated lens structure. The first and second surfaces with their respective curvature variations are combined into one lens element, eliminating the need for separate secondary lenses while maintaining full light path control capability.
Solution Approach 2:
The single lens is designed to perform multiple functions simultaneously: it concentrates light in the central region, maintains uniformity in peripheral regions, and controls the light emission path. This multi-functional design eliminates the need for additional specialized components, reducing overall device complexity.
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 enhances light uniformity and concentration in designated areas, ensuring that light is directed primarily to the street side in streetlamp applications and focused on specific regions in security lighting, while minimizing light transmission to undesired areas.
Implementation Method 1
when light passes through the molding unit formed of a material, such as silicone, the light is refracted by the molding unit
Implementation Method 2
an outer surface of the lens body includes a first side surface sloping toward a central axis at an acute angle with respect to a bottom surface of the lens body
Data Source
AI summary
An embodiment provides a lens comprising: a lens body; and a cavity disposed in the lens body, wherein the outer surface of the lens body comprises a first side surface forming an acute angle with respect to the bottom surface and slopping toward a central axis thereof, an upper surface including a flat area, and an inflection part disposed between the side surface and the upper surface.