LED Lens Angular Ratio for Third Plane Illuminance
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Solution Overview
Problem
Light-emitting device packages experience a reduction in illuminance at the center, leading to inadequate light distribution to a third plane, which affects the overall efficiency and uniformity of light emission.
Innovation Solution
A lens design with specific angular ratios of incidence and emission in different planes, where the angle of incidence is between 30 to 60 degrees, and the lens is horizontally symmetrical about certain planes, optimizing light refraction to enhance illuminance in a third plane.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional lens design is used, then the light distribution pattern is determined by the lens shape, but the illuminance of light emitted from the center is reduced and the illuminance to a third plane is insufficient
Solution Approach 1:
The patent applies local quality by creating different surface curvatures in different regions of the lens. The lens includes a first surface with a first curvature radius and a second surface with a second curvature radius, where the curvature radii differ to optimize light refraction in specific directions. This allows the lens to have different optical properties in different local areas, improving illuminance distribution to the third plane while maintaining overall lens functionality.
Solution Approach 2:
The patent employs parameter changes by systematically varying the curvature radii of the lens surfaces. The first curvature radius and second curvature radius are specifically designed with different values to control the refraction of light at different angles. By adjusting these geometric parameters, the lens achieves improved illuminance in the third plane direction without compromising center illuminance, resolving the contradiction between overall light distribution and localized brightness.
2Illumination intensity
If the lens shape is modified to increase illuminance to a third plane, then light distribution improves, but the structural complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the lens into distinct surfaces with different curvature characteristics. The lens comprises a first surface and a second surface, each with independently optimized curvature radii. This segmentation allows each surface to be designed for specific optical functions, improving illuminance to the third plane while keeping the overall structure manageable through modular design principles.
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 lens design mitigates the reduction in center illuminance and increases light emission to a third plane, improving the light distribution pattern and uniformity, as demonstrated by increased illuminance in the diagonal direction.
Implementation Method 1
a lens including a lower end portion having an incident surface on which light is incident and an upper end portion having an emitting surface through which the light that has passed through the incident surface passes
Data Source
AI summary
One embodiment relates to a lens comprising: a lower end portion having an incident surface to which light is incident; and an upper end portion having an emitting surface allowing the light having passed through the incident surface to pass therethrough, wherein the ratio of an incidence angle and an emission angle on a first plane and/or the ratio of an incidence angle and an emission angle on a second plane is smaller than the ratio of an incidence angle and an emission angle on a third plane, the incidence angle is an angle of the light incident to the incident surface with respect to a center axis, the emission angle is an angle of the light emitted from the emitting surface with respect to the center axis, each of the first to third planes is a plane passing the center axis and is parallel to a first direction, the first plane is perpendicular to the second plane, the third plane is positioned between the first plane and the second plane, the center axis passes the center of the lens and is parallel to the first direction, and the first direction is a direction facing the lower end portion from the upper end portion.