LED Strip Bulb Layout for Passive Cooling and Uniform Light
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Solution Overview
Problem
Existing LED lamps face challenges in efficiently dissipating heat without significant cost or weight, often resulting in non-uniform light emission patterns that do not mimic incandescent bulbs, leading to shadow lines and flux variations.
Innovation Solution
A solid state lamp design using flexible LED strips affixed to a bulb form, allowing heat dissipation through a large surface area exposed to ambient air, with low-power LEDs spread out to minimize heat concentration and enhance efficacy, and incorporating dynamic feedback for strip redundancy and temperature management.
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 the strips are spaced apart to distribute heat generation across a larger surface area, enabling effective passive cooling.
Solution Approach 2:
The patent transitions from mounting LEDs on a flat substrate (2D plane) to distributing LED strips across the three-dimensional bulb surface. This spatial distribution allows heat to dissipate in multiple directions and utilizes the bulb's surface area more effectively for thermal management.
2Device complexity
If all LEDs are mounted on a relatively small flat substrate, then device complexity is reduced, but light emission pattern becomes non-uniform causing shadow lines and flux variations
Solution Approach 1:
The patent moves from a 2D flat substrate mounting to 3D surface distribution of LED strips across the bulb. This allows light to be emitted from multiple locations around the bulb, creating a more uniform spherical illumination pattern that eliminates shadow lines and flux variations.
Solution Approach 2:
The patent segments the light source into multiple independent strips distributed across the bulb surface. Each strip emits light from its location, and the combined effect of multiple distributed sources creates uniform illumination, whereas a single flat substrate would create directional lighting with shadows.
3Temperature
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 its own structure. The bulb form factor and spacing between LED strips create natural convection currents that dissipate heat without requiring external heat sinks or active cooling mechanisms, eliminating the need for heavy metal components.
Solution Approach 2:
The patent removes the heat sink component entirely from the design. Instead of adding a separate heat dissipation device, the cooling function is integrated into the bulb's structural design through strip spacing and convection pathways, eliminating unnecessary weight.
4Ease of manufacture
If LEDs are mounted on a flat substrate with diffusive envelope, then manufacturing is simplified, but heat removal using ambient air currents is difficult when lamp is mounted in any orientation
Solution Approach 1:
The patent transitions from 2D flat substrate mounting to 3D surface distribution of strips. This allows heat to escape in multiple directions regardless of lamp orientation, as the strips are positioned on the curved bulb surface where heat can convection-cool toward the nearest ambient air, making the design orientation-independent.
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 up to 90% per LED, and mimics incandescent light distribution, providing uniform light emission and energy savings of up to 30% compared to traditional LED lamps.
Implementation Method 1
heat dissipation through a large surface area exposed to ambient air
Implementation Method 2
heat dissipation through a large surface area exposed to ambient air
Implementation Method 3
solid state lamp using light emitting strips
Implementation Method 4
low-power LEDs spread out to minimize heat concentration
Data Source
AI summary
A solid state lamp includes a connector and a bulb portion with multiple strips.