LED Filament with Flexible Joint for Homogeneous Light Distribution
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Solution Overview
Problem
LED lamps with traditional filaments exhibit inhomogeneous light distribution, particularly emitting less light in the longitudinal direction, which is undesirable and hinders Energy Star certification due to significant variations in light intensity across different planes.
Innovation Solution
An LED filament comprising two longitudinal sections connected by a flexible conductive section, allowing adjustable positioning and angle between sections, which can be bent to create a more uniform light distribution without additional optical elements, using substrates like glass or PCB and conversion layers for color adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If LED filaments are arranged parallel to the longitudinal axis of the lamp, then the structure is simple and easy to manufacture, but the light distribution becomes inhomogeneous with much less light emitted in the longitudinal direction
Solution Approach 1:
The LED filament is divided into multiple segments arranged at different orientations. Each segment contains LEDs positioned at specific angles relative to the longitudinal axis, allowing light to be emitted in multiple directions including the longitudinal direction, thereby achieving homogeneous light distribution while maintaining manufacturing simplicity
Solution Approach 2:
The filament structure employs asymmetric arrangement of LED segments at different angles. By positioning LED segments at various orientations (e.g., 0°, 45°, 90°) relative to the longitudinal axis, the structure breaks the symmetry that causes directional light bias, enabling uniform omnidirectional light emission
2Object-affected harmful factors
If LED filaments are arranged with slight deviation from longitudinal direction to minimize shadows, then shadow generation is reduced, but light distribution remains inhomogeneous in the longitudinal direction
Solution Approach 1:
The filament is segmented into multiple sections with different angular orientations. This segmentation allows each segment to address specific directional lighting needs, with some segments optimized for lateral illumination and others for longitudinal illumination, collectively eliminating shadows while ensuring uniform light distribution
Solution Approach 2:
The invention transitions from a one-dimensional linear filament arrangement to a multi-dimensional spatial configuration. By distributing LED segments in three-dimensional space at various angles around the longitudinal axis, the system achieves omnidirectional light emission that eliminates shadows while maintaining uniform intensity distribution
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 flexible connection enables a more homogeneous light distribution, meeting Energy Star requirements by ensuring 90% of intensity values vary by no more than 25% across planes, enhancing lamp design flexibility and compliance.
Implementation Method 1
The LEDs may be coated by a coating for converting the light generated by the LEDs into a desired wavelength range
Data Source
AI summary
A LED filament for an omnidirectional lamp comprises two longitudinal filament sections, and each filament section includes a plurality of LEDs. The two filament sections are electrically conductively connected by a flexible connecting section. A lamp using such LED filaments provides a light distribution having an increased homogeneity.