LED Strip Bulb Layout for Passive Cooling and Spherical Light
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Solution Overview
Problem
Existing LED lamps face challenges in efficiently dissipating heat without significant cost or weight, often requiring metal fins or heavy metal heat sinks, which add cost and depart from the spherical light emission pattern of incandescent bulbs, causing shadow lines and flux variations.
Innovation Solution
A solid state lamp design using flexible LED strips affixed to a bulb form, allowing heat to be transferred through the surface to ambient air, with optional protective layers and strategic spacing for air circulation, and employing low-power LEDs spread over a large surface area to minimize heat concentration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high power LEDs are used to achieve desired lumen output with fewer LEDs, then the number of LEDs is reduced, but heat dissipation becomes difficult due to concentrated heat in small surface area
Solution Approach 1:
The patent divides the light source into multiple low-power LED strips distributed across the bulb surface, rather than using fewer high-power LEDs. Each strip contains multiple LEDs connected in series, and multiple strips are arranged to spread heat generation across a larger surface area, enabling effective passive cooling.
2Temperature
If metal fins or heavy metal heat sinks are used to remove heat, then heat dissipation is improved, but cost and weight increase significantly
Solution Approach 1:
The patent enables the lamp to cool itself passively through natural convection and radiation. The bulb form factor and LED strip arrangement create sufficient surface area for heat dissipation without requiring active cooling mechanisms or heavy heat sinks, allowing the lamp to remove its own waste heat through ambient air currents.
3Ease of manufacture
If all LEDs are mounted on a relatively small flat substrate, then manufacturing is simplified, but light emission pattern departs from standard spherical distribution causing shadow lines and flux variations
Solution Approach 1:
The patent transitions from mounting LEDs on a two-dimensional flat substrate to distributing LED strips across the three-dimensional surface of the bulb. The strips are wrapped around or affixed to the bulb form, creating a spherical distribution of light sources that reproduces the omnidirectional emission pattern of traditional incandescent bulbs and eliminates shadow lines.
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 design achieves efficient cooling, reduces costs by 90% per LED, enhances efficacy by 30%, and mimics the spherical light distribution of incandescent bulbs, eliminating shadow lines and flux variations.
Implementation Method 1
allowing heat to be transferred through the surface to ambient air
Implementation Method 2
with optional protective layers and strategic spacing for air circulation
Data Source
AI summary
A solid state lamp includes a connector and a bulb portion with multiple strips.