Electrostatic Chuck With Segmented Electrodes For Scratch Resistance
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Solution Overview
Problem
Electrostatic chucks used for absorbing glass substrates face issues with electrode damage and short circuits due to scratches, leading to unstable absorption and potential target object separation during transfer.
Innovation Solution
An electrostatic chuck design featuring a first electrode pattern with a small electrode width in the central region and a second electrode pattern with a larger width in the peripheral region, where positive and negative electrodes are alternately aligned, minimizing the risk of short circuits and ensuring stable absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fine electrode pattern with small electrode width is used to absorb glass substrate, then absorption stability is improved, but susceptibility to short circuits from scratches increases
Solution Approach 1:
The electrode structure is divided into two regions with different properties: the central region uses fine electrode patterns (0.5-1mm width) for stable absorption of glass substrates, while the peripheral region uses wide electrode patterns (30-50mm width) to resist scratch-induced short circuits. This local differentiation allows each region to optimize for its specific function.
Solution Approach 2:
The electrode system is segmented into multiple independent electrode patterns arranged in alternating positive and negative configurations. This segmentation ensures that if one electrode pair experiences a short circuit due to scratches, other electrode pairs remain functional and can maintain absorption stability.
2Reliability
If electrode width is increased to prevent short circuits, then resistance to scratches is improved, but absorption effectiveness on glass substrate deteriorates
Solution Approach 1:
Different electrode widths are applied to different spatial locations: wide electrodes (30-50mm) in peripheral regions where scratches are most likely to occur provide robust short circuit resistance, while fine electrodes (0.5-1mm) in central regions maintain optimal absorption effectiveness for the glass substrate processing area.
Solution Approach 2:
The wide electrode patterns in the peripheral region provide excessive protection against short circuits, ensuring that even if scratches occur, the system maintains reliability. This partial over-protection in non-critical areas allows the central fine electrodes to operate at optimal effectiveness without compromise.
3Reliability
If fine electrode patterns are used throughout, then absorption stability is improved, but device vulnerability to damage increases
Solution Approach 1:
The electrode system implements local quality differentiation where central regions use fine electrodes for absorption stability while peripheral regions use wide, robust electrodes for durability and scratch resistance. This spatial differentiation allows the system to maintain both absorption stability and electrode strength simultaneously.
Solution Approach 2:
The wide peripheral electrode patterns serve as a protective buffer against scratches and damage before they can affect the critical fine central electrodes. This beforehand cushioning protects the vulnerable fine electrodes from direct exposure to mechanical damage during substrate handling and processing.
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 design effectively prevents electrode short circuits and maintains stable absorption, reducing the risk of target object separation and minimizing replacement costs and time, while allowing for efficient transfer of glass substrates.
Implementation Method 1
an absorption electrode formed in the absorption plate and for generating an electrostatic force between the target object and the absorption electrode
Data Source
AI summary
Provided is an electrostatic chuck capable of minimizing short circuits of electrodes due to scratches generated on a surface of the electrostatic chuck, and achieving stable absorption.