Complementary Lens Cover Geometry Batwing Light Distribution
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Solution Overview
Problem
Conventional lighting systems with batwing-shaped light distribution suffer from significant light reflection off the light transmitting cover, reducing efficiency, as the angle of incidence is too large, leading to a substantial percentage of light being reflected rather than transmitted.
Innovation Solution
The geometry of the lens and cover are made complementary, with the lens having a convex portion and the cover having a concave portion, allowing light to exit at a reduced angle of incidence, thereby increasing transmission efficiency while maintaining a batwing-shaped light distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional lens and cover configuration is used to achieve batwing-shaped light distribution, then the desired light distribution pattern is obtained, but a significant percentage of light is reflected off the cover due to large angle of incidence, reducing system efficiency
Solution Approach 1:
The patent modifies the geometric parameters of the lens and cover surfaces by introducing complementary convex and concave portions. This changes the angle of incidence parameters at the cover interface, transforming the light path to reduce reflection angles and improve transmission efficiency while preserving the batwing light distribution pattern.
Solution Approach 2:
The patent applies curved surface geometry by incorporating convex portions on the lens and corresponding concave portions on the cover. These curved surfaces work together to redirect light rays at optimized angles, reducing the incidence angle at the cover interface and minimizing reflection losses while maintaining the desired illumination pattern.
2Loss of energy
If the angle of incidence at the cover is reduced to minimize reflection, then light transmission efficiency improves, but the batwing-shaped light distribution may be compromised
Solution Approach 1:
The patent applies different surface geometries to different regions of the optical system. The lens has convex portions in specific regions that correspond to concave portions on the cover, creating localized optical paths that optimize both transmission efficiency and light distribution pattern in different spatial zones.
Solution Approach 2:
By carefully adjusting the geometric parameters of the convex and concave portions, the patent optimizes the light path angles to simultaneously achieve reduced reflection (improved transmission efficiency) and maintained batwing-shaped light distribution pattern.
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
This configuration reduces light reflection and increases efficiency by approximately 6.5% in optical efficiency and 4% in cover efficiency compared to prior art, while still providing a batwing-shaped light distribution.
Implementation Method 1
The second surface of the lens includes a convex portion that is convex with respect to the light source. The first surface of the cover includes a convex portion that is convex with respect to the light source and disposed over the convex portion of the second surface of the lens.
Data Source
AI summary
In some embodiments, a lighting system comprises: a light source; a lens spaced apart from the light source and including a first surface to receive light from the light source, the lens further including a second surface through which at least a portion of the light received by the lens exits; and a cover spaced from the lens and including a first surface to receive at least a portion of the light that exits the lens, the cover further including a second surface through which at least a portion of the light received by the cover exits; the second surface of the lens including a portion convex with respect to the light source; the first surface of the cover including a portion convex with respect to the light source and disposed over the convex portion of the lens. In some embodiments, the second surface of the cover is flat.