Aspheric Lens with Variable Curvature for Uniform Illuminance
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Solution Overview
Problem
Conventional LED lighting devices suffer from non-uniform spatial and illuminance distributions, leading to poor lighting quality and eye fatigue due to concentrated bright areas and rapid darkness beyond the central irradiation surface, which is not efficiently addressed by existing lens designs.
Innovation Solution
The proposed lighting device incorporates a lens with a specific light emitting surface shape, including a center portion with a concave or convex shape, an edge portion with a convex shape, and a middle portion with a predetermined inclination, along with a reflective gap member and a flange, to optimize light distribution and illuminance uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional lens is used to concentrate light on a narrow irradiation surface, then light illuminance is high at the center, but light distribution becomes non-uniform with rapid darkness beyond the central area
Solution Approach 1:
The lens surface is divided into multiple regions (first, second, third regions) with different curvature radii. The first region has a smaller curvature radius to concentrate light, while the second and third regions have progressively larger curvature radii to distribute light outward, creating local variations in light control properties across the lens surface.
Solution Approach 2:
The lens is segmented into distinct functional zones with different optical characteristics. Each region (first, second, third) is designed with specific curvature properties to perform different functions in the light distribution process, transforming a single uniform lens into a multi-functional optical element.
2Illumination intensity
If light is concentrated on a narrow irradiation surface, then central brightness is high, but lighting quality deteriorates due to eye fatigue from non-uniform distribution
Solution Approach 1:
Different regions of the lens provide different light control functions: the first region maintains central brightness through smaller curvature radius, while the second and third regions gradually expand light distribution to eliminate abrupt darkness boundaries, reducing eye fatigue from non-uniform lighting.
Solution Approach 2:
Instead of using a single strong convergence point that creates harsh brightness, the lens inverts the approach by using progressive curvature changes from center to edge, distributing light intensity gradually rather than concentrating it sharply, thereby maintaining brightness while improving comfort.
3Stability of the object's composition
If a lens with complex multi-region curvature is used to improve light distribution, then illuminance uniformity improves, but lens manufacturing complexity increases
Solution Approach 1:
The lens uses continuous curvature variations described by mathematical equations rather than discrete geometric shapes. The curvature radius changes continuously from the first region through the second to the third region, providing precise control over light distribution while maintaining a smooth, manufacturable surface profile.
Solution Approach 2:
The lens design varies the curvature radius parameter systematically across different regions. By controlling this single geometric parameter to change progressively from the center outward, the lens achieves complex light distribution patterns without requiring multiple discrete optical elements or complicated structural features.
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 efficient spatial light distribution and uniform illuminance, reducing eye fatigue by ensuring that light is evenly distributed across the irradiation surface, meeting Energy Star certification standards and improving lighting quality.
Implementation Method 1
a lens on the light source, wherein the lens includes a light incident surface and a light emitting surface
Implementation Method 2
a gap member placed on the light source and including a reflective portion and a wall coupled to the substrate
Data Source
AI summary
Disclosed is a lens including a light emitting surface. The light emitting surface of the lens according to the embodiment of the present invention has a coordinate obtained by subtracting a Bezier coordinate corresponding to an aspheric coordinate from the aspheric coordinate.