Radial LED Light Bars for Omnidirectional Illumination
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Solution Overview
Problem
LED light bulbs face challenges in meeting the specific luminous intensity distribution requirements set by ENERGY STAR for replacing omnidirectional lamps, as they typically emit a focused beam of light rather than a uniform omnidirectional light.
Innovation Solution
The design includes a base with a light transmissive cover and upstanding light bars mounted radially around an axis, positioned to shine inward, combined with a reflector that uses various shapes and materials to distribute light evenly across the required zones, ensuring compliance with ENERGY STAR standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional LEDs are used to emit focused beam of light, then energy efficiency is improved, but luminous intensity distribution uniformity deteriorates
Solution Approach 1:
The patent divides the lighting system into multiple segments: multiple light bars with LEDs are arranged radially around the axis, each emitting light in a specific direction. This segmentation allows the focused beam characteristic of individual LEDs to be distributed across multiple zones, achieving both energy efficiency and uniform luminous intensity distribution across the 0° to 135° zone while maintaining at least 5% flux in the 135° to 180° zone.
2Illumination intensity
If light reflectors and diffusers are added to spread out focused light beam, then luminous intensity distribution is improved, but device complexity increases
Solution Approach 1:
Instead of adding complex reflectors and diffusers in the traditional approach, the patent transitions to a radial arrangement of light bars in a different spatial dimension. Multiple LEDs are positioned radially around the axis at different angular positions, emitting light inward toward the axis. This dimensional reorganization naturally distributes light across the required zones without requiring additional optical components, thus improving luminous intensity distribution while minimizing device complexity.
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
This configuration allows the LED light bulb to emit light uniformly across the 0° to 135° zone and emit at least 5% of the total flux in the 135° to 180° zone, effectively meeting the ENERGY STAR requirements for omnidirectional lighting.
Implementation Method 1
LED (light emitting diode) lights
Implementation Method 2
light emitting diodes mounted on each of the light bars
Implementation Method 3
Light reflectors, diffusers, and lens have been employed in LED light bulbs, to spread out the focused light beam of an LED
Data Source
AI summary
An LED light bulb includes a base, a light transmissive cover and upstanding light bars. The base is in electrical communication with a power source and has an axis and a periphery. The light transmissive cover is substantially mounted on the periphery. The upstanding light bars are mounted radially around the axis and located between the axis and the periphery. The upstanding light bars are arranged to substantially emit light inward to the axis.