LED Optical Lens for Strip-Type Light Field Generation
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Solution Overview
Problem
Conventional illuminating devices using LEDs often generate diffusion-type light fields, which are not suitable for applications requiring strip-type light fields, resulting in inefficient light utilization, such as in street lamps.
Innovation Solution
An optical lens system with diverging and converging portions, specifically designed to adjust the light field shape by expanding light along one direction and compressing it along the other, enhancing the utilization of light emitted from LEDs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a diffusion-type light field is used in conventional LED illuminating devices, then the light distribution is uniform in all directions (circular pattern), but the light utilization rate decreases because part of the light is lost and does not meet the strip-type light field requirements for applications like street lamps
Solution Approach 1:
The optical lens is divided into multiple lens units, each with specific light guiding structures (first and second light guiding portions) that segment and redirect light in different directions. This segmentation allows the light to be distributed in a controlled strip-type pattern rather than uniformly in all directions, improving both adaptability to application requirements and light utilization efficiency.
Solution Approach 2:
Different regions of the optical lens are designed with different light guiding properties. The first light guiding portions and second light guiding portions have different orientations and functions, creating local variations in light distribution. This local quality approach enables specific areas to direct light where it is most needed, transforming the uniform circular pattern into a focused strip-type light field that reduces light loss.
2Illumination intensity
If a diffusion-type light field is used, then the light distribution is circular and uniform, but the light intensity and length along the desired direction are insufficient for strip-type applications
Solution Approach 1:
The patent transforms the light field from a two-dimensional circular pattern to a one-dimensional strip-type pattern by introducing directional light guiding structures. The first and second light guiding portions orient light along specific axes, effectively changing the dimensional characteristics of the light distribution to match strip-type application requirements and increase intensity along the desired direction.
Solution Approach 2:
The optical lens employs asymmetric light guiding structures where the first light guiding portions and second light guiding portions are oriented at different angles and have different geometrical configurations. This asymmetry breaks the circular symmetry of conventional diffusion-type light fields, creating an elongated strip-type light field with enhanced intensity along the primary illumination direction.
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 optical lens system effectively generates a strip-type light field with increased intensity and length along the desired direction, improving the overall light utilization and suitability for applications like street lamps.
Implementation Method 1
An optical lens system with diverging and converging portions, specifically designed to adjust the light field shape by expanding light along one direction and compressing it along the other
Data Source
AI summary
An optical lens includes an array of lens units. Each lens unit includes a main body, a light diverging portion and a light converging portion. The main body includes a light incident surface and a light emitting surface opposite to the light incident surface. The light diverging portion is configured for expanding a light field along a first direction. The light converging portion is configured for compressing a light field along a second direction. The light diverging portion and the light converging portion are formed on at least one of the light incident surface and the light emitting surface. The light converging portion includes parallel recesses distributed along the second direction.