LED Illumination Device with Hollow Column Diffuser
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Solution Overview
Problem
LED bulbs exhibit undesirable anisotropic light direction, resulting in suboptimal light distribution with a limited beam angle, which restricts their application in illumination devices.
Innovation Solution
Incorporating a diffusing element with a hollow column shape and a rough surface surrounding the LED light source, which gradually reduces in diameter and features distinct optical characteristics to enhance light diffusion, thereby increasing the beam angle and improving light distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If an LED light source is used to replace conventional fluorescent lamps or incandescent bulbs, then power saving and long lifetime are achieved, but the light distribution becomes anisotropic with a limited beam angle
Solution Approach 1:
A diffusing element is introduced as an intermediary component between the LED light source and the surrounding environment. This diffusing element has a hollow column shape with a rough surface that gradually reduces in diameter outward, serving as a mediator to scatter and redistribute the anisotropic light from the LED, thereby achieving isotropic light distribution while maintaining the energy efficiency of the LED source
Solution Approach 2:
The physical parameters of the light propagation path are changed by introducing a diffusing element with specific geometric parameters (hollow column shape, gradually reducing diameter, rough surface texture). These parameter changes transform the directional light emission into omnidirectional illumination, expanding the beam angle to approximately 360 degrees while preserving the low power consumption characteristics of the LED
2Ease of manufacture
If the light emitting surface of the LED is kept parallel to the base supporting plane, then manufacturing simplicity is maintained, but the beam angle remains limited to about 120 degrees
Solution Approach 1:
The diffusing element acts as a mediator that compensates for the limited beam angle caused by the parallel mounting configuration. Its hollow column shape with rough surface and gradually reducing diameter creates multiple light scattering paths, effectively expanding the illumination angle to 360 degrees without requiring complex LED orientation or additional optical components
Solution Approach 2:
The diffusing element introduces a vertical dimension to light redistribution by scattering light in multiple directions (upward, downward, sideways) from the horizontally mounted LED. This dimensional transformation converts the two-dimensional planar emission into three-dimensional omnidirectional illumination, achieving wide beam angle coverage while maintaining simple parallel mounting
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 significantly increases the beam angle to around 180°, providing a wider illumination range and light emitting efficiency similar to conventional incandescent bulbs, addressing the limitations of LED bulbs in light distribution.
Implementation Method 1
the first diffusing element has a rough surface including a plurality of surface structures
Data Source
AI summary
An illumination device including a base, at least one LED light source and a diffusing element is provided. The base has a supporting plane. The LED light source disposed on the supporting plane has a light emitting surface substantially parallel to the supporting plane. The diffusing element disposed on the supporting plane to cover the at least one LED light source. The diffusing element includes a first portion and a second portion. The first portion located above the at least one LED light source. The second portion connected between the first portion and the base. An optical characteristic of the first portion is different from that of the second portion so that a non-continuous boundary is defined between the first portion and the second portion.