LED Lens with Segmented Zones for 50-80 Degree Emission
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Solution Overview
Problem
Existing LED spotlights face challenges in achieving a balanced emission angle between 50° and 80° for efficient room illumination, as current optical units have low optical efficiency and cannot be easily adapted to improve spatial dimensions for better performance.
Innovation Solution
A light fixture with a lens that reduces the initial emission angle of LEDs from over 80° to a range of 50° to 80°, utilizing a convergent lens design with a focus area and an outer area to enhance optical efficiency, ensuring compatibility with existing fixtures and minimizing light losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If existing optical units are used to achieve emission angle of 50° to 80°, then the emission angle is improved, but the optical efficiency deteriorates
Solution Approach 1:
The lens is divided into two functional zones: a focus area (central region) that concentrates light to achieve the desired emission angle of 50° to 80°, and an outer area (peripheral region) that allows light to pass through with minimal deviation. This segmentation enables different parts of the lens to perform different optical functions, achieving both the target emission angle and high optical efficiency of at least 80%.
2Loss of energy
If the lens is positioned close to the light-emitting diode to minimize light losses, then the optical efficiency is improved, but the risk of contact with mounting components increases
Solution Approach 1:
The lens features non-uniform spacing from the light-emitting diode: the focus area is positioned at a first spacing (e.g., 0.5 mm to 2 mm) to minimize light losses and maximize optical efficiency, while the outer area is positioned at a second spacing (at least 2 mm) to avoid contact with mounting components. This local differentiation of spacing ensures both high optical performance and mechanical reliability.
3Productivity
If the emission angle is reduced below 40° for efficient local illumination, then the local illumination efficiency is improved, but the ability to illuminate complete rooms deteriorates
Solution Approach 1:
The lens is designed to change the emission angle parameter from the LED's initial wide angle (typically 120° or more) to an optimized range of 50° to 80°. This parameter transformation creates a compromise that maintains sufficient local illumination efficiency while expanding the coverage area to illuminate complete rooms effectively, unlike narrower angles below 40°.
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 an optical efficiency of at least 80%, effectively illuminating both local and large areas with improved light distribution, while maintaining compatibility with existing lighting systems.
Implementation Method 1
a lens arranged downstream of the light-emitting diode, having a central focus area and an outer area radially surrounding the focus area. The focus area is configured and/or arranged in such a way that a part of the light propagating through the focus area is focused in such a way that a final emission angle of the light propagated through the focus area is at least 50° and at most 80°
Implementation Method 2
The lens is preferably configured as a convergent lens. The dimensions of the lens can be adapted to the dimensions of the housing, in particular of the depression thereof.
Data Source
AI summary
A light fixture has a housing having a depression in which at least one light-emitting diode is received. The light-emitting diode is mounted on a mounting surface and in operation of the light fixture emits light with an initial emission angle of more than 80°. A lens is arranged downstream of the light-emitting diode, having a central focus area and an outer area radially surrounding the focus area. The central focus area is configured and/or arranged in such a way that a part of the light propagating through the focus area is focused in such a way that a final emission angle of the light propagated through the focus area is at least 50° and at most 80°. The outer area of the lens is spaced at least 2 mm from the mounting surface in a vertical direction.