LED Mounting on Conductive Coating for TL-Retrofit Tubes
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Solution Overview
Problem
Existing lighting devices, such as retrofit fluorescent tube lamps with LEDs, face issues due to the large mechanical dimensions and weight of light generation components, which are exacerbated by the use of printed circuit boards that add unnecessary weight and material.
Innovation Solution
A lighting device with a conductive layer structure directly applied to the inner surface of a light transmissive outlet unit, allowing LEDs to be mounted and connected directly to this structure without a board, reducing weight and material usage, and enabling flexible electrical connections and additional circuitry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If printed circuit board technology is used to mount LEDs, then electrical connections and circuit functionality are achieved, but weight and material usage increase
Solution Approach 1:
The patent extracts and removes the printed circuit board from the LED lighting device, retaining only the essential electrical connection function. The conductive traces are applied directly to the inner surface of the light outlet unit, eliminating the separate board structure and its associated weight while maintaining electrical connectivity between LEDs.
Solution Approach 2:
The patent merges the electrical connection function with the light outlet unit structure itself. The conductive layer structure is integrated directly onto the inner surface of the light outlet unit, combining what were previously separate components (circuit board and housing) into a unified structure, thereby reducing overall weight and material usage.
2Reliability
If printed circuit board technology is used to mount LEDs, then circuit functionality is achieved, but device cost and material usage increase
Solution Approach 1:
The patent extracts the circuit board as a separate material component and replaces it with a thin conductive layer structure applied directly to the light outlet unit. This extraction eliminates the need for separate PCB materials, reducing overall material consumption while preserving circuit functionality through the conductive traces.
Solution Approach 2:
The patent employs a thin film conductive layer structure instead of a rigid printed circuit board. This thin film approach provides the necessary electrical connectivity with minimal material thickness and quantity, reducing both material usage and device weight while maintaining functional reliability.
3Weight of moving object
If a conductive layer structure is applied directly to the light outlet unit, then weight and material usage are reduced, but manufacturing complexity may increase
Solution Approach 1:
The patent changes the physical state and application method of the conductive material from a pre-formed rigid board to a depositable layer. The conductive layer structure can be applied through various deposition techniques (screen printing, spray coating, vapor deposition), transforming the manufacturing process into one that can be integrated with existing light outlet unit production, thereby simplifying overall manufacturing despite the novel approach.
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 solution results in a lighter, cost-effective lighting device with reduced material usage and waste, while allowing for efficient heat management and flexible electrical configurations, including series and parallel connections, and the integration of additional components like temperature sensors.
Implementation Method 1
a conductive layer structure, which is arranged as a coating on a portion of an inner surface of the light outlet unit, wherein the light emitting diodes are mounted on and electrically connected with the conductive layer structure
Implementation Method 2
a phosphor layer is arranged on the inner surface of the light outlet unit, which phosphor layer converts light emitted by the light emitting diodes before being outlet through the light outlet unit
Data Source
AI summary
This invention relates to a lighting device comprising a light transmissive light outlet unit (102), and light emitting diodes (104) generating light which is emitted through the light outlet unit. The lighting device further comprises a conductive layer structure (114), which is arranged as a coating on a portion of an inner surface of the light outlet unit. The light emitting diodes are mounted on and electrically connected with the conductive layer structure.