LED Lamp Light Distribution via Tilted Modules and Diffuser
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Solution Overview
Problem
Current LED lamps struggle to achieve broad light distribution when used as a substitute for incandescent bulbs, as the light emitted is mostly directed in a specific direction due to Lambertian characteristics, limiting the area illuminated.
Innovation Solution
The design incorporates a plurality of LED modules, including a main LED module positioned on the central axis and auxiliary LED modules tilted to face a polyhedron-shaped light diffusing member, which increases the amount of light diffused and distributed over a broader area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a single mounting substrate with LED chips is used, then the device complexity is low, but the light distribution range is limited due to Lambertian characteristics
Solution Approach 1:
The single mounting substrate is divided into multiple mounting substrates (first, second, third, and fourth mounting substrates), each with LED chips arranged in different orientations. This segmentation allows light to be emitted in multiple directions simultaneously, expanding the light distribution range from a single-direction Lambertian pattern to a multi-directional coverage that includes forward, backward, lateral, and oblique directions.
Solution Approach 2:
The invention transitions from a two-dimensional light distribution pattern (single substrate emitting in one hemisphere) to a three-dimensional light distribution pattern by arranging multiple substrates at different orientations and positions. The first and second substrates emit light in opposite directions along the central axis, while the third and fourth substrates emit light laterally, creating omnidirectional light coverage in three-dimensional space.
2Area of stationary object
If a translucent globe is used to diffuse light, then the light distribution is improved, but the diffusion effect is limited because light mostly passes through sections ahead of the LEDs
Solution Approach 1:
The light distribution function is segmented between multiple LED substrates positioned at different orientations and the translucent globe. Each substrate emits light in a specific direction, and the globe diffuses this light further. This segmentation ensures that light reaches the globe from multiple directions, maximizing the diffusion effect across the entire globe surface rather than just the forward-facing sections.
Solution Approach 2:
The multiple LED substrates are pre-positioned to emit light in various directions before the light reaches the translucent globe. This preliminary multi-directional emission ensures that light is already distributed across different angular ranges before entering the globe, allowing the globe to diffuse light more effectively across its entire surface area.
3Manufacturing precision
If LED chips are arranged to emit light in a specific direction, then the manufacturing precision is high, but the light distribution characteristics deviate from incandescent bulb characteristics
Solution Approach 1:
The invention employs asymmetric arrangements of LED substrates with different orientations. The first and second substrates are positioned to emit light in opposite directions along the central axis, while the third and fourth substrates are positioned to emit light laterally. This asymmetric multi-orientation arrangement maintains precise manufacturing control for each substrate while achieving overall omnidirectional light distribution that adapts to replace incandescent bulb characteristics.
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 enhances light distribution by increasing the amount of light reflected and scattered by the diffusing member, resulting in a broader light distribution range compared to single-module LED lamps.
Implementation Method 1
a light diffusing member, wherein the main LED module emits light towards the light diffusing member
Data Source
AI summary
Provided is a bulb-type LED lamp 10 configured to diffuse light outward through a globe. The bulb-type LED lamp 10 includes LED modules 22, 24, 28, 30, each having a mounting substrate and LEDs mounted on the mounting substrate, and a base 14 through which power is supplied to the LEDs for light emission. The LED lamp 10 also includes a light diffusing member 58. Among the LED modules 22, 24, 28, 30, the LED module 22 is positioned on an imaginary extension of a central axis X of the base 14, and the light diffusing member 58 is positioned inside the globe 16 to receive light emitted from the LED module 22. The other LED modules 22, 28, 30 are positioned in a vicinity of the LED module 22, tilted to face the light diffusing member 58.