Electrostatic Chuck Electrode Sheet Segmentation
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Solution Overview
Problem
The existing electrostatic chuck designs with stacked electrode layers through an inter-electrode insulating layer face challenges in accurately detecting the presence or absence of a substrate due to minimal capacitance difference, leading to erroneous detection when using conventional substrate detection methods.
Innovation Solution
The electrostatic chuck electrode sheet features a layered structure with a first electrode layer having openings and a second electrode layer with opening equivalent portions, optimized to increase the capacitance difference between the presence and absence of a substrate, allowing for accurate detection using a known substrate detection device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If two electrode layers are stacked in the depth direction through an inter-electrode insulating layer to increase attraction force, then the holding force for large substrates is improved, but the capacitance difference between substrate presence and absence becomes minimal, causing erroneous detection
Solution Approach 1:
The electrode layers are segmented into multiple regions with different functions: a first region with overlapping electrode areas for generating attraction force, and a second region with non-overlapping electrode areas for detecting substrate presence through capacitance measurement. This segmentation allows the same electrode structure to serve dual purposes of holding and detecting substrates effectively.
2Force
If the electrode layers are completely overlapping to maximize capacitance, then the attraction force is maximized, but the capacitance difference for substrate detection becomes undetectable
Solution Approach 1:
The electrode structure is divided into a first region where electrodes overlap to generate attraction force and a second region where electrodes do not overlap to enable capacitance-based substrate detection. This spatial segmentation resolves the contradiction between maximizing attraction force and maintaining detectable capacitance differences.
Solution Approach 2:
The electrode layers serve multiple functions: they generate electrostatic attraction force in the first region and simultaneously function as capacitance sensors in the second region. This multi-functionality allows a single electrode structure to address both holding and detection requirements without needing separate components.
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 configuration enhances the attraction force and holding force of the electrostatic chuck while minimizing erroneous detection, enabling reliable substrate detection and efficient production processes.
Implementation Method 1
a bipolar electrostatic chuck which attracts a substrate due to the potential difference between two electrodes
Implementation Method 2
detects whether or not the substrate is attracted to the electrostatic chuck by measuring the capacitance between the electrodes
Implementation Method 3
an inter-electrode insulating layer, a second electrode layer, and a second insulating layer are stacked
Data Source
AI summary
An electrostatic chuck electrode sheet which allows the difference in capacitance between electrodes due to the presence or absence of a substrate to be increased to a level which can be accurately detected using a known substrate detection device, and allows an electrostatic chuck to exhibit an excellent attraction force, and an electrostatic chuck using the electrode sheet, are disclosed. The electrode sheet has a layered structure in which a first insulating layer, a first electrode layer, an inter-electrode insulating layer, a second electrode layer, and a second insulating layer are stacked and attracts a substrate on the first insulating layer, the first electrode layer having a plurality of openings in a specific planar area, and the second electrode layer having opening equivalent portions provided at positions at which the openings in the first electrode layer are projected onto the second electrode layer in a depth direction of the electrode sheet and having almost the same area as the projected openings, and connection portions that connect the opening equivalent portions. The electrostatic chuck is formed using the electrode sheet.