Electron Source Base Structure for Emitting Tip Vibration Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The vibration of the emitting tip in electron sources during SEM inspections negatively affects image quality, especially at high currents, leading to oscillations in gray scale levels and reduced critical dimension stability in charged particle beam systems.
Innovation Solution
The electron source is stabilized by a base that reduces thermal contact and vibrations of the emitting tip, using a configuration such as a 'W' shape with tabs or extensions to increase the spring constant and minimize thermal contact, thereby reducing oscillations and improving image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the emitting tip is electrically connected to two electrodes and coupled to a base, then the electron emission function is improved, but the vibration and thermal contact of the emitting tip increases, leading to image quality degradation
Solution Approach 1:
The base is segmented into multiple tabs (first tab, second tab, third tab, fourth tab) that are distributed around the emitting tip. This segmentation allows the base to provide electrical connection and thermal management while minimizing vibration transmission to the emitting tip, as each tab independently supports the structure without creating excessive mechanical coupling.
Solution Approach 2:
Different tabs are positioned at different locations around the emitting tip to provide localized functions: some tabs provide electrical connection while others provide mechanical support. The tabs are strategically placed to minimize thermal contact paths while maintaining electrical connectivity, thus improving local quality of connection without compromising overall stability.
2Manufacturing precision
If the base reduces thermal contact with the emitting tip, then the critical dimension stability is improved, but the electrical connection reliability may be affected
Solution Approach 1:
The electrical connection is segmented into multiple paths through different tabs rather than a single direct connection. This segmentation allows the system to maintain reliable electrical connectivity while reducing thermal coupling, as the heat transfer path is distributed and minimized across multiple low-contact-area tab connections.
Solution Approach 2:
The tabs act as intermediary elements between the base and the emitting tip. These intermediaries provide the necessary electrical connection while intentionally minimizing thermal contact area, thus serving as mediators that enable electrical functionality while protecting against thermal interference that would affect critical dimension stability.
3Stability of the object's composition
If the base uses a configuration with tabs or extensions to increase the spring constant, then the vibration of the emitting tip is reduced, but the device complexity increases
Solution Approach 1:
The base structure merges multiple functions into a single component: mechanical support, electrical connection, and vibration damping are all integrated into the tabbed base structure. This merging avoids the need for separate components for each function, thus reducing overall device complexity while achieving the desired vibration reduction through the increased spring constant provided by the tab configuration.
Solution Approach 2:
The tabs in the base structure serve multiple functions simultaneously: they provide mechanical support to increase the spring constant and reduce vibration, they establish electrical connections to the emitting tip, and they manage thermal contact. This multi-functionality eliminates the need for additional dedicated components, maintaining device simplicity while achieving vibration control.
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 stabilization results in higher quality images with reduced oscillations in gray scale levels and improved critical dimension stability, enhancing the repeatability and accuracy of SEM inspections.
Implementation Method 1
an emitting tip electrically connected to two electrodes and configured to emit an electron
Data Source
AI summary
Apparatuses and systems for stabilizing electron sources in charged particle beam inspection systems are provided. In some embodiments, a system may include an electron source comprising an emitting tip electrically connected to two electrodes and configured to emit an electron; and a base coupled to the emitting tip, wherein the base is configured to stabilize the emitting tip via the coupling.