Multiple Light Distribution Structure for Directional LED Uniformity
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Solution Overview
Problem
Directional LED light sources exhibit uneven light distribution, resulting in high central intensity with stepped drops, yellow spots, and stray light outside the beam angle, necessitating a solution to match light distribution curves for specific light environments.
Innovation Solution
A multiple light distribution structure comprising a reflective cup with a reflective layer, a light source plate with multiple light emitting units, a lens system with truncated cone-shaped lens units, and a multi-point lens, all integrated within a lamp cup and powered by an electric source, ensuring even light distribution within the beam angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a traditional directional LED light source is used, then the light source can provide directional illumination, but the light distribution is uneven with high central intensity and stepped drops
Solution Approach 1:
The patent divides the light distribution function into multiple components: a reflective cup for initial light reflection, multiple lens units (including aspherical lens units) for light shaping, and a multi-point lens for additional light distribution control. Each component segments the overall light distribution task, allowing precise control over light intensity uniformity while maintaining directional illumination
Solution Approach 2:
The patent employs different types of lens units with specific optical properties at different positions. Aspherical lens units are used in specific regions to correct local light distribution issues, while other lens units handle general light shaping. This local optimization approach achieves uniform light distribution without requiring complete redesign of the entire optical system
2Use of energy by moving object
If a traditional light source is replaced with a directional LED, then energy efficiency is improved, but yellow spots and black dots appear on the illuminated object
Solution Approach 1:
The patent introduces multiple intermediary optical elements between the LED light source and the illuminated object. The reflective cup acts as an intermediary to collect and redirect light, while the lens units and multi-point lens serve as intermediaries to shape and redistribute light. These intermediaries transform the inherently non-uniform LED light output into uniform illumination, preserving energy efficiency while eliminating visual defects
Solution Approach 2:
The patent changes optical parameters through the use of different lens materials and designs. By selecting lens materials with specific refractive indices and designing lens surfaces with varying curvatures (including aspherical surfaces), the system transforms light propagation parameters to achieve uniform intensity distribution across the illuminated area, eliminating yellow spots and black dots
3Shape
If a directional LED light source is used, then beam directionality is achieved, but stray light is emitted outside the beam angle
Solution Approach 1:
The patent converts potentially harmful stray light into beneficial illumination by using the reflective cup to capture light that would otherwise escape the beam angle. The reflective cup redirects this stray light back into the desired beam direction, transforming what was originally a harmful effect (light loss and glare) into a beneficial effect (improved light utilization and maintained beam directionality)
Solution Approach 2:
The patent addresses stray light by adding optical control in multiple dimensions. The lens units are arranged in specific spatial configurations with different orientations, and the multi-point lens provides additional dimensional control over light distribution. This multi-dimensional approach precisely confines light within the desired beam angle while eliminating stray light emission
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 even light distribution within the beam angle, eliminating issues of high central intensity and stray light, thereby meeting specific light environment requirements.
Implementation Method 1
a reflective cup having a bowl shape, an inner wall of the reflective cup being coated with a reflective layer
Implementation Method 2
a lens facing the light source plate, and a plurality of lens units are provided on the lens, each of the plurality of lens units facing one of the plurality of light emitting units
Data Source
AI summary
The present invention discloses a multiple light distribution structure of a directional light source, which comprises a reflective cup having a bowl shape, an inner wall of the reflective cup being coated with a reflective layer; a light source plate disposed inside the reflective cup, the light source plate being fixed to a bottom of the reflective cup by means of a plurality of screws, and the light source plate having a plurality of light emitting units which are provided thereon; a lens facing the light source plate, the lens having a plurality of lens units which are provided thereon, each of the plurality of lens units facing one of the plurality of light emitting units; and a multi-point lens, covering on the reflective cup. Owning to multiple light distributions performed through the reflective cup, the lens and the multi-point lens, light in the beam angle may be evenly distributed.