LED Filament Bulb with Adjustable Tilt Angles for Uniform Illumination
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Solution Overview
Problem
Conventional LED light bulbs often create light and dark patterns due to the arrangement of LED filaments, resulting in incomplete illumination of areas, especially around the circumference, which limits their effectiveness in providing a wide-angle illumination.
Innovation Solution
The design features multiple LED filaments with adjustable tilt angles, supported by a central column and bracket system, along with isolated heat sinks and a driver for controlling luminance, to ensure even light distribution and simulate a flame effect, while using a bulb shell with lenses for color beam separation and a gas-filled container for heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If LED filaments are arranged in conventional configurations, then the structure is simple, but light and dark patterns are created resulting in incomplete illumination
Solution Approach 1:
The LED lighting system is segmented into multiple independently controllable LED filaments (first LED filament, second LED filament, third LED filament, fourth LED filament) arranged at different orientations. Each filament can be controlled separately through the driver circuit to adjust luminance levels and color temperatures, allowing precise control over light distribution patterns to eliminate dark areas while maintaining manageable system complexity through modular design.
Solution Approach 2:
Different regions of the lighting device are assigned different qualities: the first and second LED filaments are positioned to provide primary illumination with specific color temperatures, while the third and fourth LED filaments are positioned to fill dark areas with complementary color temperatures. The driver circuit applies different luminance control strategies to different filament groups, creating locally optimized illumination quality that collectively achieves uniform overall illumination.
2Illumination intensity
If multiple LED filaments are used to achieve wide-angle illumination, then illumination coverage is improved, but heat management becomes more challenging
Solution Approach 1:
The heat management system is segmented into multiple independent heat sinks (first heat sink, second heat sink, third heat sink, fourth heat sink), each dedicated to specific LED filaments. This segmentation allows heat from each filament to be dissipated independently, preventing heat accumulation and enabling better thermal management as the number of filaments increases, thus supporting wider illumination coverage without compromising temperature control.
Solution Approach 2:
Heat pipes are introduced as intermediary thermal management components that efficiently transfer heat from the LED filament mounting locations to the heat sinks. The heat pipes act as thermal conduits, mediating the heat transfer process between the light-generating components and the dissipation structures, enabling effective heat removal from multiple filaments simultaneously while maintaining operational temperatures.
3Illumination intensity
If LED filaments are fixed at tilt angles to achieve even light distribution, then illumination uniformity is improved, but structural complexity increases
Solution Approach 1:
The support structure merges multiple functions into integrated components: the bracket structure simultaneously provides mechanical support for the LED filaments at their required tilt angles, serves as a mounting platform for the heat sinks, and establishes the spatial geometry for optimal light distribution. The lever and support structures are designed to inherently position the filaments at the correct angles, combining structural support with optical positioning functions to reduce overall system complexity.
4Temperature
If isolated heat sinks are used for each LED filament, then heat dissipation efficiency is improved, but device complexity increases
Solution Approach 1:
The bracket structure serves multiple universal functions: it supports the LED filaments at correct orientations, provides mounting locations for the heat sinks, establishes the geometric arrangement for light distribution, and connects to the lever mechanism for positioning. This multi-functionality reduces the need for separate dedicated components, allowing isolated heat sinks to be integrated without proportionally increasing overall 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 achieves a 360-degree wide-angle illumination by ensuring that all areas are uniformly lit, overcoming the limitations of traditional LED bulb designs and enhancing the light pattern with adjustable color temperature and luminance.
Implementation Method 1
Electroluminescence, an optical and electrical phenomenon, was discover in 1907. Electroluminescence refers the process when a material emits light when a passage of an electric field or current occurs. LED stands for light-emitting diode.
Implementation Method 2
The multiple supporting wires are respectively connected to different isolated heat sinks.
Data Source
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AI summary
The filament bulb includes a bulb base, a bulb and a light source assembly. The bulb is disposed on the bulb base. The light source assembly is used for luminescence. The light source assembly is connected to the bulb base. The light source assembly is extended the bulb. The light source assembly includes a central column, a bracket, and multiple LED light filaments. The central column is disposed on the bulb base. The bracket is disposed on the central column. The supporting wire is fixed on the central column. A circumferential direction of the central column is surrounded by multiple LED light filaments.