Substrate Holding Head Structure for Retainer Collision Loads
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Solution Overview
Problem
During chemical mechanical polishing of quadrangle substrates, the risk of the substrate colliding with the retainer member is high due to its large dimensions and weight, which can affect the mounting mechanism of the retainer member.
Innovation Solution
A head for holding polygonal substrates is designed with a substrate support surface matching the substrate shape, featuring a retainer member outside each side and a retainer guide. The retainer member has an engaging surface perpendicular to the support surface, engaging with the guide to distribute lateral forces and reduce the risk of mechanical stress on the mounting bolts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the substrate dimension is increased to improve production efficiency, then the productivity is improved, but the risk of substrate collision with retainer member increases and mechanical stress on mounting mechanism worsens
Solution Approach 1:
The retainer guide acts as an intermediary component between the retainer member and the mounting mechanism. It receives and distributes lateral collision forces from the substrate along the engaging surface, preventing direct transmission of impact loads to the mounting bolts, thereby protecting the mounting mechanism while allowing large substrate processing
2Reliability
If the retainer member is positioned outside each side of the substrate support surface to prevent substrate from jumping out, then the substrate holding reliability is improved, but the likelihood of substrate collision with retainer member increases
Solution Approach 1:
The retainer guide serves as a protective intermediary that absorbs collision impacts. The engaging surface between the retainer member and retainer guide is designed to distribute lateral forces, converting concentrated impact loads into distributed stresses along the engaging surface, thereby reducing peak stresses that could cause mounting mechanism failure
3Productivity
If the substrate weight is increased for larger dimensions, then the production efficiency is improved, but the mechanical stress on the retainer member mounting mechanism worsens
Solution Approach 1:
The retainer guide functions as a force-distributing intermediary structure. When substrates collide with retainer members during polishing, the retainer guide's engaging surface distributes the impact forces along its length, preventing concentrated loads from being transmitted directly to the mounting bolts, thereby enabling safe processing of heavier, larger substrates
Data Source
AI summary
Provided is a structure that reduces a risk of affecting a mounting mechanism of a retainer member when a substrate collides with the retainer member.According to one embodiment, a head for holding a polygonal substrate is provided. The head includes a substrate support surface, a retainer member, and a retainer guide. The substrate support surface has a shape corresponding to a shape of the polygonal substrate. The retainer member is disposed outside each side of the substrate support surface. The retainer guide is configured to support the retainer member. The retainer member has an engaging surface extending in a direction perpendicular to the substrate support surface, and the engaging surface of the retainer member engages with the retainer guide.