Composite Spin Chuck Pin with High-Modulus Insert
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Solution Overview
Problem
Conventional support pins in devices for processing wafer-shaped articles are subjected to significant stresses, which impair their reliability and shorten their service life, necessitating improved constructions to enhance durability and longevity.
Innovation Solution
The pins are made of chemically inert bulk material with a hollow cavity containing an insert of higher Young's modulus material, such as carbon fiber-reinforced composite, entirely covered by the bulk material, to provide enhanced structural integrity and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pins are made of chemically inert bulk material (such as PTFE or PVDF), then chemical resistance is improved, but mechanical strength and service life deteriorate due to considerable stresses during use
Solution Approach 1:
The pin is constructed as a composite structure with an inner insert made of high-strength material (such as carbon fiber-reinforced plastic or metal) and an outer layer of chemically inert bulk material (such as PTFE or PVDF). This composite construction allows the inner insert to bear the mechanical stresses while the outer layer provides chemical resistance, thereby simultaneously improving both mechanical strength and reliability without sacrificing chemical resistance
2Reliability
If pins are made of chemically inert bulk material, then chemical resistance is improved, but durability deteriorates under repeated stress cycles
Solution Approach 1:
The composite construction with an inner insert of high-strength material and an outer layer of chemically inert material allows the structure to withstand repeated stress cycles. The inner insert absorbs the mechanical stresses while the outer layer maintains chemical resistance, preventing stress-induced degradation and significantly improving durability under repeated stress cycles
3Strength
If an insert is added to enhance strength, then mechanical strength is improved, but device complexity increases
Solution Approach 1:
The pin is divided into two functional segments: an inner insert for mechanical strength and an outer layer for chemical resistance. This segmentation allows each part to be optimized for its specific function while maintaining a relatively simple overall structure that can be manufactured using standard composite manufacturing processes
Solution Approach 2:
The composite construction integrates multiple materials with different properties into a single unified structure. The inner insert and outer layer are bonded together to form a cohesive pin that provides both mechanical strength and chemical resistance, avoiding the need for separate components and complex assembly procedures
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 enhanced pin design significantly increases the number of processing cycles without failure, extending the service life of the devices by several orders of magnitude, from 100,000 to 1,000,000 wafers.
Implementation Method 1
an insert positioned within said cavity formed of a material whose Young's modulus is greater than that of the bulk material
Data Source
Figure 1
Figure 2a~2c
AI summary
Improved durability and longevity of spin chucks is achieved by using a composite support pin structure in which a pin body of a chemically inert plastic includes a hollow cavity containing an insert formed from a material whose Young's modulus is greater than that of the inert plastic.