LED Retrofit Lamp Light Guide with Annular Grooves for Uniform Illumination
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Solution Overview
Problem
Existing LED retrofit lamps suffer from non-uniform light intensity distribution and low inner space utilization, leading to increased costs due to the need for a compact LED driver and limited space for electronic components.
Innovation Solution
An LED lighting assembly featuring a light guide body with annular grooves on its inner surface, which reflects light to achieve uniform intensity distribution and increased space for electronic components by using a heat sink with a hollow region, allowing for a larger installation space without compromising component size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a simple glass or plastic bulb is used as a diffuser, then the manufacturing cost is reduced and structure is simplified, but the light intensity distribution becomes non-uniform
Solution Approach 1:
The bulb is segmented into multiple functional zones: a light guide body with specific refractive index, annular grooves for light redirection, and a reflecting surface. This segmentation allows each zone to perform a specific optical function, achieving uniform light distribution while maintaining simple manufacturing processes for each component.
Solution Approach 2:
The light guide body acts as an intermediary between the LED chip and the external environment. It receives light from the LED chip, guides it through the annular grooves, and redirects it via the reflecting surface to achieve uniform light distribution without requiring complex optical systems.
2Volume of stationary object
If the LED driver volume is reduced to fit in the limited heat sink space, then the heat sink can accommodate the driver, but the manufacturing cost increases notably
Solution Approach 1:
The patent utilizes the vertical dimension by positioning the LED driver above the printed circuit board, outside the heat sink cavity. This dimensional rearrangement frees up the heat sink internal space while providing adequate room for the LED driver, eliminating the need for costly miniaturization of the driver.
3Shape
If the printed circuit board divides the lamp into heat sink and bulb parts, then the structure is organized, but the inner space utilization ratio becomes low
Solution Approach 1:
The patent merges the bulb and heat sink into an integrated structure where the bulb is positioned over the heat sink with the printed circuit board. This integration improves space utilization by eliminating separate housings and optimizing the arrangement of internal components within the combined structure.
Solution Approach 2:
The LED driver is relocated to a different spatial dimension (above the PCB, outside the heat sink), allowing the heat sink and bulb to be closely integrated without spatial conflict, thereby maximizing inner space utilization.
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 solution provides improved light intensity distribution and higher inner space utilization, reducing manufacturing complexity and costs while maintaining a compact structure.
Implementation Method 1
a heat sink thermally conducted with the printed circuit board
Implementation Method 2
the inner surface is structured so as to form a reflecting surface reflecting at least part of light from the end surface to the outer surface
Data Source
AI summary
An LED lighting assembly may include a printed circuit board with an LED chip, and a heat sink thermally conducted with the printed circuit board, wherein the LED lighting assembly further comprises a light guide body configured as a bulb, the light guide body having an end surface as a light incidence surface of light from the LED chip, an outer surface as a light emergent surface and an inner surface, wherein the inner surface is structured so as to form a reflecting surface, reflecting at least part of light from the end surface to the outer surface.