LED Lamp Filament Protrusions for Wide Angle Light Emission
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Solution Overview
Problem
Conventional LED lamp filaments have a small emitting angle due to their cup or bowl-shaped holders, which limits their luminescence efficiency compared to incandescent lamps.
Innovation Solution
An LED lamp filament with an elongated substrate featuring protrusions on its sides, where light emitting units are distributed along the substrate and covered by a fluorescent adhesive layer, allowing light to be emitted towards the opposite side, increasing the emitting angle and enhancing light distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a cup or bowl-shaped LED holder is used, then the device structure is simple, but the emitting angle is small and luminescence effect is insufficient
Solution Approach 1:
The holder is divided into multiple protrusions distributed along the extending direction of the substrate. Each protrusion acts as an independent light guiding structure, segmenting the light emission paths and enabling light to emit from multiple directions, thereby increasing the overall emitting angle and luminescence effect.
Solution Approach 2:
The protrusions extend in the thickness direction of the substrate, adding a vertical dimension to light emission. Light is guided not only horizontally along the substrate but also vertically through the protrusions, creating multi-directional emission that significantly expands the emitting angle beyond the conventional planar structure.
2Illumination intensity
If light emitting units are arranged on a flat substrate surface, then the device structure is simple, but light distribution is limited
Solution Approach 1:
The substrate surface is segmented into multiple protrusions with light emitting units distributed on each. This segmentation creates multiple light emission sources at different positions and angles, improving light distribution uniformity and coverage area without requiring complex optical systems.
Solution Approach 2:
Different regions of the substrate are given different functions through the protrusion configuration. The protrusions serve as localized light guiding and emission structures, while the valleys between them provide spacing and additional emission pathways. This local differentiation optimizes light distribution across the entire substrate area.
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 configuration of protrusions on the substrate increases the emitting angle of the LED lamp filament, improving light distribution and efficiency while also providing a stable adhesive layer and heat sink effect, addressing the limitations of conventional LED holders.
Implementation Method 1
a fluorescent adhesive layer covering the first surface and the plurality of light emitting units; wherein partial light emitted from the light emitting units and excited by the fluorescent adhesive layer emits along a direction from a portion between adjacent protrusions towards a second surface of the substrate
Implementation Method 2
an elongated substrate; wherein at least one side of the substrate is provided with a plurality of protrusions
Data Source
Figure 1
Figure 2
AI summary
A LED lamp filament (10), comprising: a long strip-shaped substrate (100), a plurality of light-emitting units (200) arranged on a first surface of the substrate (100) and distributed along the extending direction of the substrate (100), and a light-transmittable fluorescent glue layer (300) covering the first surface and the plurality of light-emitting units (200). A plurality of bulges (110) are provided on at least one side of the substrate (100), and the bulges (110) are distributed along the extending direction of the substrate (100); one part of light excited by the fluorescent glue layer (300) and emitted from the light-emitting units (200) emits out in a direction towards a second surface, opposite to the first surface, of the substrate (100) from a space between adjacent bulges (110).