Dual-Sided LED Lamp with Reflection Surface for Omnidirectional Lighting
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Solution Overview
Problem
Conventional LED lamps struggle to achieve light distribution characteristics similar to incandescent lamps, with reflector type lamps having low light efficiency, lens type lamps facing difficulties in rearward light radiation, and vertical type lamps experiencing challenges in uniform light emission and increased manufacturing costs.
Innovation Solution
LED lamps with LEDs mounted on both top and bottom surfaces of a substrate, featuring a heat sink with a reflection surface to expand the orientation angle and an air flow path for effective heat dissipation, allowing light to be radiated in both forward and rearward directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a reflector type LED lamp is used to achieve similar light distribution to incandescent lamps, then the orientation angle characteristic is improved, but the light efficiency deteriorates
Solution Approach 1:
The invention divides the LED lamp structure into multiple independent LED modules arranged in a circular array, each emitting light in specific directions. This segmentation allows the lamp to achieve 360-degree omnidirectional light distribution without requiring a reflector, thus maintaining high light efficiency while achieving the desired orientation angle characteristic similar to incandescent lamps.
2Loss of energy
If a lens type LED lamp is used to control light direction, then the light efficiency is improved, but the ability to radiate light in rearward direction deteriorates
Solution Approach 1:
The invention employs asymmetric light emission by mounting LEDs on both the front and rear surfaces of the substrate. The front surface LEDs emit light forward while the rear surface LEDs emit light backward, creating a balanced omnidirectional light distribution pattern that overcomes the unidirectional limitation of lens type LED lamps.
3Illumination intensity
If a vertical type LED lamp is used to emit light in sideward direction, then the light distribution curve is improved, but the uniform light emission in all directions deteriorates
Solution Approach 1:
The invention transitions from a single vertical LED orientation to a two-dimensional circular array of LEDs mounted on both front and rear surfaces of a substrate. This dimensional expansion allows light to be emitted uniformly in all horizontal directions (360 degrees), achieving omnidirectional illumination that maintains excellent light distribution characteristics.
4Illumination intensity
If LEDs are mounted on both top and bottom surfaces of substrate, then the light distribution characteristic similar to incandescent lamp is achieved, but the device complexity increases
Solution Approach 1:
The substrate serves multiple functions simultaneously: it acts as a mechanical support for mounting LEDs on both surfaces, provides thermal management by conducting heat away from the LEDs, and enables the omnidirectional light emission pattern. This multi-functionality reduces the need for separate components, thereby managing device complexity while achieving the desired light distribution characteristic.
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 achieve a light distribution characteristic similar to incandescent lamps, with improved light efficiency and heat dissipation, while maintaining operability and reducing manufacturing costs.
Implementation Method 1
light propagating in a rearward direction of the substrate may be reflected by the reflection surface, thereby expanding an orientation angle of the light
Implementation Method 2
a heat sink is provided with a dissipation pin and an air flow path, which is in communication with the outside, so that heat generated from an LED can be effectively dissipated due to the flow of air
Data Source
AI summary
Exemplary embodiments of the present invention relate to an LED lamp including a substrate, a first LED, a second LED, a heat sink, and a transparent cover. The first LED is arranged on a first surface of the substrate. The second LED is arranged on a second surface of the substrate, the second surface being an opposite side of the substrate from the first surface. The heat sink has a mounting surface on which the substrate is arranged. The heat sink also has a reflection surface. The transparent cover covers the substrate, the first LED, and the second LED.