X-ray Cathode Carbon Layer Deposition
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Solution Overview
Problem
Current x-ray generation devices using carbon nano tubes require complex purification and deposition processes, making them inefficient and costly, despite offering better performance and efficiency compared to traditional materials.
Innovation Solution
The x-ray generation device incorporates metal units with chemical-vapor-deposited carbon layers in a multiple-wall form, directly grown on the metal units, reducing the starting and operating voltage requirements and simplifying the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If carbon nano tubes are used as field emission material, then electron emission efficiency is improved, but manufacturing complexity increases due to required purification and deposition processes
Solution Approach 1:
The patent extracts the essential functional component (carbon layer) from the complex carbon nano tube structure, depositing it directly as a thin film on the metal unit. This eliminates the need for complex purification and deposition processes while maintaining the electron emission efficiency benefits of carbon-based materials.
Solution Approach 2:
The patent changes the structural parameters of the carbon material from individual nano tubes to a continuous thin film layer. This parameter change simplifies the manufacturing process while preserving the high electron emission efficiency, as the thin film provides sufficient field emission performance without requiring complex nano tube assembly.
2Reliability
If carbon nano tubes are used in x-ray generation device, then electron emission performance is improved, but production cost increases due to complex processing steps
Solution Approach 1:
The patent extracts only the necessary carbon layer from the complex carbon nano tube structure, depositing it directly on the metal unit. This extraction approach maintains the electron emission performance while eliminating costly purification and precise deposition steps, thereby reducing production cost.
Solution Approach 2:
The patent uses a relatively simple carbon thin film deposition process instead of complex carbon nano tube fabrication. This approach accepts a simpler, more cost-effective manufacturing method that achieves sufficient performance without requiring expensive and complex processing steps.
3Ease of manufacture
If conventional thermionic cathode is used, then manufacturing is simpler, but energy efficiency deteriorates as 99% of electricity transforms to heat
Solution Approach 1:
The patent creates a composite structure combining metal units with deposited carbon layers. This composite material approach enables field emission characteristics (high energy efficiency) while maintaining the manufacturing simplicity of conventional metal-based cathodes, achieving both low energy loss and ease of manufacture.
Solution Approach 2:
The patent changes the emission mechanism parameter from thermionic emission (conventional) to field emission (carbon-based). This parameter change fundamentally improves energy efficiency by enabling electron emission at lower temperatures, reducing the 99% energy loss to heat while keeping the overall device structure and manufacturing process relatively simple.
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 approach results in improved performance by achieving lower starting and operating voltages, enhancing electron emission efficiency, and simplifying the production process, making it more viable for widespread adoption.
Implementation Method 1
each of the metal units being chemical-vapor-deposited a carbon layer
Implementation Method 2
An x-ray generation device generates field emission electrons according to quantum theory of field electron emission
Data Source
AI summary
An x-ray generation device and a cathode thereof are provided. The x-ray generation device comprises the cathode, a focusing device, an anode target, and a glass container. The cathode comprises a container and an electron beam generator. The container has a base and a side wall surrounding the base, and both of them define a trench. The electron beam generator comprises at least one metal unit, each of the at least one metal unit is chemical-vapor-deposited a carbon layer, and each of the at least one metal unit is disposed on a bottom of the trench. The at least one metal unit is electrically connected to an outer metal unit of the x-ray generation device. The glass container contains the cathode, the focusing device, and the anode target in sequence. Each of the at least one carbon layer faces the anode target. The glass container has a valve for evacuating and a window for emitting an x-ray.