Bulb-Type LED Lamp Cooling Surface Integration
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Solution Overview
Problem
Existing LED lamps with protective domes over PCBs and LEDs suffer from reduced cooling efficiency and impaired omnidirectional light distribution due to the base plate, which hampers desired light distribution and increases size for enhanced cooling.
Innovation Solution
The cooling means and light transmittable surface are spread over the bulb's outer surface, forming an integral part of it, with cooling means extending from inside the bulb to the outer surface, and light source distributed in sub-groups, allowing for improved cooling and omnidirectional light distribution without increasing the lamp's size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protective dome is provided over PCBs and LEDs, then consumer safety is improved, but cooling efficiency deteriorates and light distribution is impaired
Solution Approach 1:
The patent removes the protective dome that was covering the PCBs and LEDs, exposing the light source and cooling means directly to the ambient atmosphere. This extraction of the dome eliminates the thermal isolation barrier, allowing efficient heat dissipation from the LED cluster while maintaining consumer safety through alternative protective measures in the bulb design.
2Temperature
If cooling means surface area is increased, then cooling capacity is improved, but lamp size increases
Solution Approach 1:
The patent utilizes the bulb's outer surface area in three-dimensional space to provide extensive cooling means. By distributing cooling fins and heat dissipation structures across the bulb's external surface, the design achieves large cooling surface area without increasing the internal volume or overall lamp size, as the cooling function is implemented on the existing external geometry.
3Strength
If a base plate is provided to mount the dome, then structural support is improved, but omnidirectional light distribution deteriorates
Solution Approach 1:
The patent removes the base plate that was necessary for mounting the protective dome, as the dome itself is eliminated. This extraction eliminates the obstruction to light distribution while maintaining structural integrity through alternative mounting configurations of the LED cluster directly to the bulb structure, enabling unobstructed omnidirectional light emission.
4Temperature
If cooling means are concentrated in one area, then cooling efficiency is improved, but light distribution uniformity deteriorates
Solution Approach 1:
The patent segments the cooling means into multiple distributed cooling zones across the bulb's outer surface, with each zone serving a specific LED sub-group. This segmentation allows heat to be dissipated uniformly from different areas of the bulb, preventing hot spots and maintaining consistent thermal conditions that support uniform light distribution in all directions.
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 design enhances cooling efficiency and light distribution by increasing the exposed cooling surface area and allowing free air flow, while maintaining a compact size, achieving equal luminous intensity across a 300° space angle with minimal variation.
Implementation Method 1
the cooling means and the light transmittable surface are spread over the bulb outer surface... the cooling means extend from inside the bulb into the outer surface of the bulb... the cooling means has a significantly increased cooling surface and the cooling surface is exposed directly to the ambient atmosphere
Implementation Method 2
allowing free flowing air to flow along the cooling areas, for example due to convection
Data Source
Figure 1A
Figure 1B~1C
Figure 2A~2B
AI summary
A bulb-type LED lamp (1) has a bulb (3) mounted on a socket (5). A light source (7), comprising a plurality of LEDs mounted on a PCB (9), is arranged inside the bulb (3). The PCB (9) acts as and/or is connected to cooling means (21). The outer surface (15) of the bulb is formed both by light transmittable surface (22) and/or sub-areas (23) thereof and the cooling means (21), which cooling means extend from inside the bulb into the outer surface of the bulb. Surfaces are mutually flush at locations at the outer surface of the bulb where said surfaces of both the cooling means and the light transmittable sub-areas border each other. The spatial light intensity distribution of the lamp of the invention is significantly improved over the prior art bulb-type LED lamp.