Embedded Heater in Layered SEM Column Package
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Solution Overview
Problem
Scanning electron microscopes (SEMs) face contamination issues due to polymer deposition from samples, leading to lens charging and beam distortion, especially in low-vacuum environments, where existing solutions require electrical connections and can cause magnetic or electric potential issues.
Innovation Solution
The implementation of embedded resistive heaters within the SEM's layered column package, using low-temperature co-fired ceramic technology, provides conductive heating to components without electrical contact, effectively preventing or reducing contamination across a wide range of vacuum environments, including ultra-high and low-vacuum conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If electrical connections are used to heat components, then heating effectiveness is improved, but magnetic or electric potential interference occurs
Solution Approach 1:
The patent uses the package structure as an intermediary thermal conductor. Electrical connections are made to the package rather than directly to components, and heat is transferred through the package material to the components. This mediates the heating process to eliminate direct electrical interference with components while maintaining effective thermal coupling.
Solution Approach 2:
The patent replaces direct electrical heating of components with a thermal conduction-based heating system. Instead of passing current through components, the system uses electrical heating elements connected to the package, which then conducts heat to components through thermal conduction, substituting a mechanical/thermal system for an electrical one at the component level.
2Temperature
If multiple electrical interconnects are used to heat individual components, then heating control is improved, but device complexity increases
Solution Approach 1:
The patent merges the heating function for multiple components into a single integrated system. By connecting heating elements to the package rather than individually to each component, the system combines multiple heating functions into one unified thermal management approach, reducing the number of electrical interconnects while maintaining effective heating of all components through the package's thermal conduction.
Solution Approach 2:
The package serves multiple functions: it provides structural support, electrical isolation, and thermal conduction for heating. This multi-functionality allows a single package structure to replace multiple specialized components and interconnects, simplifying the overall device architecture while maintaining heating capability.
3Object-generated harmful factors
If high temperature is used to remove contamination, then cleaning effectiveness is improved, but component damage risk increases
Solution Approach 1:
The package acts as a thermal buffer and intermediary between the heating elements and the components. It allows controlled heat transfer to components, enabling temperature elevation for contamination removal while the package structure itself provides thermal management to prevent excessive temperatures that could damage sensitive components or bonding materials.
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 solution allows for uniform heating of components, minimizing contamination deposition and extending maintenance intervals by maintaining components at specific temperatures without electrical interference, ensuring reliable operation and reducing the need for frequent cleaning or replacement of the electron beam column.
Implementation Method 1
a heater composed of resistive materials or elements, configured in a series or parallel configuration, is embedded in the layered charged particle beam column package
Implementation Method 2
The temperature required to prevent the deposition of contamination or to remove contamination once it is deposited is determined experimentally
Implementation Method 3
The lenses, apertures, deflectors, blankers, detectors or any other component (collectively called components) attached to the package are cleaned by conductive heating
Data Source
AI summary
A scanning charge particle apparatus includes a layered charged particle beam column package; a sample holder; and a heater, such as a resistive heater, in one of the layers of the package that conductively heats layers and/or components.