Hydrophobic Coating on Detector Mating Surfaces
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Solution Overview
Problem
Portable wireless digital radiographic detectors are susceptible to moisture and bodily liquids, which can compromise their internal circuitry, and existing sealing methods are costly, complex, and may degrade over time or interfere with wireless signal transmission.
Innovation Solution
The use of hydrophobic coatings on mating surfaces and interfaces within the detector's housing to repel liquids, reducing the need for gaskets and seals, and allowing for relaxed mechanical tolerances and improved durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional sealing methods (gaskets, o-rings, gaskets) are used to prevent liquid ingress, then liquid protection is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent replaces mechanical sealing systems (gaskets, o-rings, gaskets requiring precise machining and assembly) with a hydrophobic coating system. The coating is applied directly to mating surfaces and interfaces, creating a liquid-repelling barrier without requiring complex mechanical sealing components. This substitution eliminates the need for precision machining, multiple fasteners, and careful assembly procedures while maintaining effective liquid protection.
Solution Approach 2:
The patent changes the surface properties of mating surfaces by applying a hydrophobic coating that alters the surface energy and wettability characteristics. This parameter change transforms ordinary surfaces into liquid-repelling surfaces, preventing liquid ingress through a different mechanism than conventional mechanical sealing. The coating creates a surface tension barrier that prevents liquid penetration without requiring mechanical compression or interlocking features.
2Reliability
If conventional sealing methods are used to prevent liquid ingress, then liquid protection is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent replaces the mechanical sealing system that requires precision-machined mating surfaces with a hydrophobic coating system. The coating compensates for variations in mating surface geometry by providing a continuous liquid-repelling barrier that adapts to surface irregularities. This eliminates the need for tight tolerances in machining and assembly operations while maintaining effective sealing.
3Reliability
If air-tight sealing methods are used to prevent liquid ingress, then liquid protection is improved, but heat buildup and component overheating occur
Solution Approach 1:
The patent applies hydrophobic coating to specific local areas where liquid ingress is most likely to occur (mating surfaces and interfaces), rather than creating a complete air-tight seal throughout the entire housing. This localized approach provides liquid protection at critical interfaces while maintaining air permeability in other areas, allowing heat to escape and preventing internal heat buildup.
Solution Approach 2:
The hydrophobic coating acts as an intermediary layer that selectively interacts with liquids while allowing gases to pass through. The coating provides a barrier to liquid penetration at mating surfaces while maintaining thermal and gas exchange pathways, preventing both liquid ingress and heat buildup simultaneously.
4Reliability
If conventional sealant coatings are used to prevent liquid ingress, then liquid protection is improved, but coating durability decreases due to scratching and abrasion
Solution Approach 1:
The patent uses a hydrophobic coating system that combines multiple functional properties in a single applied layer. The coating provides liquid repellency, surface protection, and durability in one application, eliminating the need for separate sealant and protective coating layers. This composite approach enhances coating longevity by integrating protective functions directly into the hydrophobic barrier.
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 effectively prevents liquid ingress while maintaining the detector's performance and reducing costs and complexity, allowing for use in environments with varying moisture levels without compromising image quality or wireless functionality.
Implementation Method 1
A hydrophobic coating applied to at least the mating surface
Data Source
AI summary
A radiographic imaging detector has photoimaging pixels disposed in an array, control electronics for controlling operation of the array to capture radiographic images, and a voltage source for powering the array of photoimaging pixels and the control electronics. A housing with multiple parts encloses at least the array and the control electronics and provides a seating for the voltage source. A first part has a first mating surface, a second part has a second mating surface. The first and second mating surfaces are disposed adjacent to each other and define a gap therebetween with a hydrophobic material deposited along at least one of the first and second mating surfaces.