Electron Beam Device Bulge-Shaped Control Grid
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Solution Overview
Problem
Existing electron beam devices used for sterilizing web packaging materials face challenges in maintaining beam shape stability and assembly complexity, which affect their performance and longevity.
Innovation Solution
An electron beam device with a tubular body and elongate cathode housing, featuring a control grid with bent longitudinal end portions forming bulge-like shapes to direct electrons perpendicular to the exit window, and a semi-annular cathode housing for easy assembly and efficient electron beam shaping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the control grid and cathode housing are attached by complex attachment means, then the assembly is more secure, but the assembly process becomes more complex and time-consuming
Solution Approach 1:
The control grid is divided into a central portion and two separate end portions that are bent into bulge-like shapes. These segmented portions can be independently attached to the cathode housing, simplifying the assembly process while maintaining secure attachment through multiple attachment points.
Solution Approach 2:
The end portions of the control grid are pre-bent into bulge-like shapes before assembly. This preliminary shaping ensures proper alignment and facilitates easier attachment to the cathode housing, reducing assembly complexity while ensuring secure mounting.
2Ease of manufacture
If the electron beam device uses a simple cathode housing design, then the assembly is easier, but the ability to shape the electron beam and maintain beam quality is reduced
Solution Approach 1:
The end portions of the control grid are bent into bulge-like shapes that create curved surfaces. These curved surfaces effectively shape the electric field and direct electron trajectories perpendicular to the exit window, achieving precise beam shaping without requiring complex housing structures.
Solution Approach 2:
The bulge-like shapes are formed specifically at the end portions of the control grid where they are needed for beam shaping, while the central portion remains simple for easy attachment. This localized complexity achieves the required beam quality without making the entire device complex.
3Reliability
If the electron beam device is designed for high performance sterilization, then the sterilization quality is improved, but the device complexity and assembly difficulty increase
Solution Approach 1:
The bulge-like shapes formed by bending the control grid end portions create optimized electric field distribution that ensures high-quality sterilization. This curved geometry achieves superior beam uniformity and perpendicular incidence on the exit window without requiring additional complex components.
Solution Approach 2:
The beam shaping function is merged into the control grid structure itself through the bulge-like shapes, rather than requiring separate beam shaping components. This integration maintains high sterilization quality while reducing overall device complexity and simplifying assembly.
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 enhances the electron beam device's ability to maintain a stable and focused beam for effective sterilization of wide web packaging materials, improving assembly simplicity and performance by actively shaping the electric field and counteracting electron trajectory spreading near the exit window.
Implementation Method 1
The cathode housing comprises a filament which is heated by a current in order for electrons to be produced
Implementation Method 2
The thus produced electrons are accelerated by means of a high-voltage potential
Implementation Method 3
free longitudinal end portions of the control grid are bent in a direction towards each other to form bulge-like shapes for the formation of electron beam shaping electrodes
Data Source
Figure 1~4
Figure 3
Figure 5a~6b
AI summary
The present invention relates to an electron beam device having a tubular body of elongate shape with an electron exit window extending in the longitudinal direction of the tubular body. Said tubular body is at least partly forming a vacuum chamber, said vacuum chamber comprising therein a cathode comprising a cathode housing (112) having an elongate shape, and at least one electron generating filament (120) and a control grid (114) both extending along the elongate shape of the cathode housing (112). The control grid (114) and the cathode housing (112) are attached to each other by attachments means (118). Free longitudinal end portions of either the control grid (114) or the cathode housing (112) are bent in a direction towards each other to form bulge-like shapes (126) for the formation of electron beam shaping electrodes. The invention is further comprising a method of manufacturing said electron beam device.