Omnidirectional LED Lighting via Reflector Redistribution
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Solution Overview
Problem
Traditional LED lamps emit directional light, which does not meet the omnidirectional illumination requirements of existing lighting standards, such as incandescent lamps, under LM79 specifications.
Innovation Solution
A solid-state light-emitting device incorporating a light emitting diode (LED) package, a light reflector or lens, and a shell that redistributes the directional light into omnidirectional radiation, using various shapes and materials for the reflector and shell to achieve even illumination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If LED package is used as forward illuminating light source, then energy efficiency is improved, but illumination directionality is limited to forward light cone
Solution Approach 1:
The illumination space is segmented into multiple zones by arranging LED packages at different orientations (upward, downward, sideways) on the mount stage, allowing each segment to contribute to different directional illumination requirements
Solution Approach 2:
LED packages are mounted with different orientations (upward, downward, sideways) rather than uniform orientation, creating asymmetric light distribution that collectively achieves omnidirectional illumination
2Device complexity
If single directional LED package is used, then device complexity is reduced, but illumination uniformity deteriorates
Solution Approach 1:
The illumination function is segmented across multiple LED packages with different orientations, where each package contributes to specific directional illumination, collectively achieving uniform omnidirectional lighting without requiring complex individual components
Solution Approach 2:
Light from multiple LED packages with different orientations is merged and redistributed by the reflector and shell to create uniform omnidirectional illumination, combining simple directional sources into a uniform omnidirectional output
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 enables LED lamps to meet LM79 specifications by converting directional light into omnidirectional light, providing uniform illumination and protecting the LED package and reflector while minimizing shadowing effects.
Implementation Method 1
The LED package, which is mounted on a plate, generates a forward light cone by converting electrical energy to optical energy
Implementation Method 2
The light reflector (or lens or light guide) is to redistribute light from at least a portion of the forward light cone to omnidirectional light
Implementation Method 3
the shell also assists and spreads directional light into omnidirectional radiation
Data Source
AI summary
A light-emitting device capable of generating omnidirectional light utilizing a reflector is disclosed. The light-emitting device, in one aspect, includes a light emitting diode (“LED”) package, a light reflector, and a shell. The LED package, which is mounted on a plate, generates a forward light cone by converting electrical energy to optical energy. The light reflector can be formed with various different shapes that can be placed adjacent to the LED package. A function of the light reflector is to redistribute at least a portion of the forward light cone whereby the overall light illuminated by the light-emitting device complies with LM79 specifications. The shell is used to enclose the LED package and the light reflector and configured to illuminate light in omnidirectional radiation in response to the forward light cone.