X-ray Window Film Sealing with Elastic Adhesive Ring
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Solution Overview
Problem
X-ray windows face challenges in being strong, opaque to visible and infrared light, transmissive to x-rays, impervious to gases, and forming a hermetic seal while avoiding deflection and electrical shorts due to differential pressures.
Innovation Solution
A mounted x-ray window design featuring a housing with a flange and a film sealed by a ring or sheet of elastic adhesive, which forms a hermetic seal and reduces stress in the film, using materials like silicon nitride and polyimide, and a baking process to achieve the desired properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the x-ray window thickness is increased to improve strength and withstand differential pressure, then strength is improved, but x-ray transmission is attenuated excessively
Solution Approach 1:
The patent employs a composite structure consisting of a thin x-ray transmissive film (such as silicon nitride or beryllium) mounted within a protective housing. The film provides excellent x-ray transmission while the surrounding housing structure (flange and adhesive ring) provides mechanical strength and pressure resistance, allowing the system to withstand differential pressures without requiring the film itself to be thick.
2Strength
If the x-ray window thickness is increased to improve strength, then strength is improved, but deflection is increased causing damage and electrical shorts
Solution Approach 1:
The patent uses a thin film design that is flexible enough to conform to the mounting structure while being sufficiently strong to maintain integrity under pressure. The film is mounted in a way that distributes stress around its perimeter through the adhesive ring and flange structure, preventing excessive deflection and bowing that would occur with a simple flat membrane under differential pressure.
3Object-affected harmful factors
If the x-ray window is made opaque to visible and infrared light to block noise, then light blocking is improved, but manufacturing complexity increases
Solution Approach 1:
The patent selects film materials such as silicon nitride or beryllium that inherently possess both high x-ray transmissivity and high opacity to visible and infrared light. This material selection achieves the light blocking function without requiring additional optical filtering layers, thereby avoiding increased manufacturing complexity while still eliminating noise in sensitive instruments.
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 a robust x-ray window that is effectively opaque to visible and infrared light, transmissive to x-rays, and impervious to gases, while maintaining a hermetic seal and withstanding high temperatures, thus addressing the issues of strength, gas impermeability, and preventing deflection and electrical shorts.
Implementation Method 1
A ring or sheet of elastic adhesive can be sandwiched between the film and the inner-side of the flange and can form a hermetic-seal between the film and the housing
Implementation Method 2
The method can comprise: (1) providing a housing with an aperture, a flange encircling the aperture, the flange having an inner-side that faces an interior of the housing; (2) placing a ring of elastic adhesive on the inner-side of the flange; (3) placing a film on the ring of elastic adhesive on the inner-side of the flange, extending across and covering the aperture, with the ring of elastic adhesive sandwiched between the film and the inner-side of the flange; (4) and baking the housing, the ring of elastic adhesive, and the film
Data Source
AI summary
A mounted x-ray window can be strong and transmissive to x-rays, can have a hermetic seal, and can withstand high temperatures. The mounted x-ray window can include a film located on an inner-side of a flange of a housing and can be attached to the flange by a ring of elastic adhesive. The film can comprise silicon nitride. A method of mounting an x-ray window can include placing a ring of elastic adhesive on an inner-side of a flange of a housing, placing a film on the ring of elastic adhesive, and baking the housing, the ring of elastic adhesive, and the film.