Linear Electron Source for Uniform Foil Charging
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Solution Overview
Problem
Modern manufacturing processes for large area substrates and foils require increased energy density for faster throughput, but existing electron sources struggle to efficiently charge surfaces while minimizing heat generation and ensuring uniform electron distribution.
Innovation Solution
A linear electron source with a longer cathode and adjustable slit opening is developed, allowing for controlled electron beam energy distribution and uniformity, which is integrated into a vacuum chamber with a gas supply system to optimize plasma generation and prevent arcing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If electron beam intensity is increased to improve charging efficiency and manufacturing speed, then productivity increases, but heat generation increases causing excessive temperature rise
Solution Approach 1:
The electron beam is divided into multiple parallel beams arranged side by side. Each beam independently charges a portion of the foil surface, distributing the total energy load across multiple channels. This segmentation allows high total electron flux for fast charging while each individual beam operates at lower intensity, preventing excessive localized heating.
Solution Approach 2:
The invention transitions from a single-point or single-line electron source to a two-dimensional array of electron beams. By arranging beams in a planar configuration that matches the foil geometry, the system achieves uniform surface charging across large areas without concentrating energy in one location, thereby controlling temperature rise while maintaining high productivity.
2Area of stationary object
If conventional electron sources are used to charge large area foils, then manufacturing scale is limited, but increasing substrate size is required for cost reduction and throughput improvement
Solution Approach 1:
The large-area foil is divided into multiple zones, each served by an individual electron beam. The segmented beam array can be configured to match the foil dimensions, enabling uniform charging across extensive surfaces. This approach maintains high charging efficiency even as foil area increases, supporting both large-scale manufacturing and high throughput.
3Manufacturing precision
If electron beam parameters are adjusted to improve electron distribution uniformity, then charging quality improves, but energy density decreases
Solution Approach 1:
By transitioning to a two-dimensional array of electron beams, the system achieves uniform energy distribution across the foil surface through spatial arrangement rather than relying on single-beam parameter optimization. Each beam delivers concentrated energy to its designated zone, maintaining high local energy density, while the overall pattern ensures uniform coverage across the entire surface.
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 enables efficient charging of thick foils and webs with precise electron implantation depth and high electron beam intensity, improving adhesion and manufacturing speed while maintaining low heat generation and uniform electron distribution.
Implementation Method 1
a linear electron source having a housing acting as an anode, the housing having side walls; a slit opening in the housing for trespassing of a linear electron beam... a power supply for providing a high voltage between the anode and the cathode; and emitting the linear electron beam
Implementation Method 2
at least one gas supply for providing a gas into the housing... to optimize plasma generation and prevent arcing
Data Source
Figure 1~3
Figure 4~5
Figure 6~9
AI summary
A method of charging a web or foil is described. The method includes guiding a web or foil having a thickness of 10 µm or larger with at least on roller; providing a linear electron source (100) having a housing (112) acting as an anode, the housing having side walls (312); a slit opening (114) in the housing for trespassing of a linear electron beam, the slit opening defining a length direction of the source; a cathode being arranged within the housing and having a first side (413) facing the slit opening; at least one gas supply (70) for providing a gas into the housing; and a power supply for providing a high voltage between the anode and the cathode; and emitting the linear electron beam, wherein the high voltage is adjusted for providing an electron energy to implant electrons of the electron beam within the web or foil.