Electrostatic Chuck Surface Layout for Easy Annular Ring Release
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Solution Overview
Problem
Existing electrostatic chucks face challenges in easily detaching an annular member due to tight attachment caused by a smooth surface design, leading to difficulties in separating the annular member from the chuck.
Innovation Solution
The electrostatic chuck incorporates a second portion with a second placement surface featuring a separation promoting part, such as a roughened surface or groove, allowing easy entry of surrounding gas to break the tight attachment between the annular member and the surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the surface of the second portion is made smooth to suppress thermal resistance, then thermal resistance between the annular member and the second portion is reduced, but the annular member becomes tightly attached and cannot be easily separated
Solution Approach 1:
The invention applies different surface properties to different regions of the second portion. The first region has a smooth surface to reduce thermal resistance, while the second region has a rough surface to facilitate easy separation of the annular member. This local differentiation resolves the contradiction by optimizing each region for its specific function.
Solution Approach 2:
The second portion is divided into two distinct regions with different surface characteristics: a first region with a smooth surface for thermal conduction and a second region with a rough surface for easy detachment. This segmentation allows the design to simultaneously achieve both low thermal resistance and easy separation.
2Reliability
If the surface of the second portion is made too smooth, then thermal resistance is reduced, but the annular member is tightly attached and cannot be easily separated
Solution Approach 1:
Instead of making the entire surface uniformly smooth or uniformly rough, the invention applies local quality by creating a smooth first region for thermal contact and a rough second region for easy separation. This approach maintains simplicity while achieving the desired functional differentiation.
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 enables easy detachment of the annular member by allowing surrounding gas to enter the gap, effectively breaking the tight attachment and facilitating separation.
Implementation Method 1
surrounding gas smoothly enters the separation promoting part to eliminate a tightly attached state between the second placement surface and the annular member
Implementation Method 2
When a voltage is applied to the adsorption electrode, an electrostatic force is generated, and the wafer placed on the dielectric substrate is adsorbed and held
Data Source
AI summary
The electrostatic chuck 10 includes: a first portion 101 including a surface 110 on which a wafer W is placed; and a second portion 102 projecting from an outer peripheral end of the first portion 101 further toward an outer peripheral side, and including a surface 180 on which an annular member RE is placed. On a part of the surface 180, a roughened surface part 182 is provided to enable surrounding gas to easily enter a space between itself and the annular member RE as compared with another portion of the surface 180.