Floating PCB Mounting for Thermal Stress Relief
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Solution Overview
Problem
In substrate processing systems, the mechanical resistance and stress on connectors between printed circuit boards (PCBs) due to thermal expansion and contraction cause connector failure, leading to high assembly costs and design inflexibility.
Innovation Solution
A mounting system that allows the first PCB to float relative to the electrostatic chuck, using shoulder screws and spacers to absorb thermal expansion and contraction, preventing displacement transfer to the PCBs and ensuring stable connector engagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the baseplate is rigidly fixed to the PCB, then structural stability is improved, but thermal expansion stress transfers to the PCB causing connector failure
Solution Approach 1:
The mounting system is divided into separate functional components: spacers that provide thermal isolation, shoulder screws that provide mechanical attachment, and floating mounting holes that allow baseplate movement. This segmentation prevents stress transfer while maintaining both structural stability and connector reliability.
Solution Approach 2:
The spacers act as intermediary elements between the baseplate and PCB, providing thermal isolation and mechanical support. The floating mounting holes serve as intermediaries that allow the baseplate to expand and contract without transferring stress to the PCB, thus protecting connectors from thermal expansion stress.
2Reliability
If the baseplate is allowed to move relative to the PCB, then thermal expansion stress on connectors is reduced, but structural stability deteriorates
Solution Approach 1:
The mounting system provides different properties at different locations: the spacers provide rigid thermal isolation at the mounting points, while the floating mounting holes provide movement freedom in the baseplate. This local differentiation allows the baseplate to move thermally while maintaining overall structural stability through the spacer-supported mounting points.
3Ease of manufacture
If conventional rigid mounting is used, then assembly simplicity is maintained, but design flexibility is reduced due to high assembly costs
Solution Approach 1:
The mounting system with spacers, shoulder screws, and floating mounting holes serves multiple functions simultaneously: thermal isolation, mechanical support, stress relief, and alignment. This multi-functional design provides both assembly simplicity and design flexibility, allowing the baseplate to accommodate different thermal conditions while maintaining a straightforward assembly process.
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 reduces stress on connectors, enables blind mating, and allows for higher current and voltage ratings, improving reliability and design flexibility while simplifying the installation and removal process.
Implementation Method 1
the baseplate comprises a plurality of heaters, and the mounting assemblies allow expansion of the baseplate along at least one of X, Y, and Z axes due to heat
Implementation Method 2
the baseplate comprises a plurality of cooling channels, and the mounting assemblies allow contraction of the baseplate along at least one of X, Y, and Z axes due to cooling
Data Source
AI summary
A substrate support assembly includes a baseplate to support at least one layer to be disposed thereon and a first printed circuit board coupled to the baseplate by a plurality of mounting assemblies that allow the baseplate to move relative to the first printed circuit board.