LED Lighting Device Vacuum Dispensing for Bubble-Free Diffusion
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Solution Overview
Problem
Existing LED lighting devices with translucent front panels often suffer from poor light diffusion, leading to visible hot spots and require time-consuming cutting and layering processes, which can introduce air bubbles and result in poor surface quality.
Innovation Solution
A method involving mixing a polyurethane compound with a diffuser compound, injecting the combined compound into a cartridge under vacuum, and dispensing it into an enclosed tray to form a stable, shelf-stable LED lighting device with improved light diffusion and surface quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If liquid polyurethane compound is mixed in a container and poured into place, then the compound can be applied to the front panel, but air is introduced into the compound resulting in poor surface quality with bubbles
Solution Approach 1:
A vacuum chamber is introduced as an intermediary device between the compound mixing and application processes. The vacuum chamber removes air from the liquid polyurethane compound before application, preventing bubbles from forming in the final product while still allowing easy pouring and application of the compound.
Solution Approach 2:
A vacuum environment is created as an inert atmosphere during the compound application process. This vacuum environment prevents air from mixing with the liquid polyurethane compound, eliminating the source of bubbles and ensuring high surface quality without compromising the ease of application.
2Adaptability or versatility
If multiple front panels are layered with liquid polyurethane compound, then aesthetic considerations including diffusion and color are addressed, but the process is time consuming and introduces air bubbles
Solution Approach 1:
The liquid polyurethane compound is prepared in advance with desired aesthetic properties (diffusion, color) built into the formulation. This preliminary preparation allows the compound to be applied in a single layer rather than requiring multiple sequential layering steps, reducing assembly time while maintaining aesthetic versatility.
Solution Approach 2:
The invention uses a composite liquid polyurethane compound that integrates multiple functions (structural stabilization, light diffusion, color provision) into a single material system. This composite approach eliminates the need for layering multiple discrete panels and compounds, significantly reducing assembly time while maintaining all aesthetic properties.
3Ease of manufacture
If acrylic panels with embedded diffusion and color characteristics are used, then light diffusion and color control are achieved, but cutting to size and shape is time consuming and requires tight tolerances
Solution Approach 1:
The invention replaces the mechanical cutting and shaping process with a liquid application process. The liquid polyurethane compound is poured and allowed to conform to the desired shape within the channel letter housing, eliminating the need for time-consuming cutting operations and tight tolerance requirements while maintaining precise light diffusion control.
Solution Approach 2:
The invention changes the physical state of the diffusion and color material from solid (requiring cutting) to liquid (allowing pouring and conformal application). This parameter change from solid to liquid state enables the material to be applied without cutting, significantly reducing manufacturing time and tolerance requirements while achieving the same light diffusion and color control functions.
4Illumination intensity
If a translucent front panel is provided to control light diffusion, then light distribution is improved, but visible hot spots appear when the panel does not properly diffuse light
Solution Approach 1:
The liquid polyurethane compound provides locally optimized light diffusion properties throughout the front panel area. The liquid formulation can be engineered with specific diffusion characteristics that ensure uniform light distribution across the entire panel surface, preventing hot spots while maintaining the desired translucent appearance.
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 method achieves improved light diffusion and surface quality by minimizing air bubbles and ensuring consistent application of the compound, thereby reducing the time and effort required for assembly and enhancing the aesthetic appeal of LED lighting devices.
Implementation Method 1
applying a vacuum to the cartridge, and sealing the cartridge at a first pressure lower than ambient pressure
Data Source
AI summary
A method is provided for assembling an LED lighting device. The method includes providing a polyurethane compound and mixing a diffuser compound with the polyurethane compound to form a combined compound. The method then includes injecting the combined compound into a cartridge, applying a vacuum to the cartridge, and sealing the cartridge at a first pressure lower than ambient pressure. The method then includes providing an LED lighting assembly having a front panel and a frame, the frame extending past the front panel to form an enclosed tray in a shape of the front panel. The combined compound is then dispensed from the cartridge into the enclosed tray.