Polishing Pad Conditioning with Adjustable Pressing Force Feedback
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Solution Overview
Problem
Chemical mechanical polishing (CMP) processes face issues with polishing pad wear and corrosion, leading to uneven surfaces and reduced substrate yield, which existing conditioning apparatuses fail to adequately address.
Innovation Solution
A conditioning apparatus with a housing, conditioning member, cylinder member, first and second pressing members, stopper member, photo sensor, monitoring sensor, and load cell sensor, which allows for precise adjustment and monitoring of pressing forces to maintain polishing pad uniformity and surface quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional conditioning apparatus is used to condition the polishing pad, then the polishing pad surface is cleaned, but the pressing force cannot be precisely controlled resulting in uneven conditioning
Solution Approach 1:
The patent implements a movable stopper member that can dynamically adjust its position along the longitudinal direction of the housing. This dynamic adjustment capability allows the pressing force applied to the polishing pad to be precisely controlled and adapted, enabling uniform conditioning across the pad surface while maintaining a relatively simple overall device structure.
Solution Approach 2:
The patent incorporates a monitoring sensor that detects the position of the first pressing member and provides feedback to the control system. This feedback mechanism enables real-time monitoring and adjustment of the pressing force, ensuring precise control over the conditioning process and achieving uniform polishing pad surface treatment.
2Productivity
If the polishing pad is used for extended periods, then substrate production increases, but the polishing pad surface becomes uneven and corrosion occurs reducing yield
Solution Approach 1:
The patent performs preliminary conditioning actions on the polishing pad during idle periods or between substrate processing runs. The conditioning member is positioned to contact and treat the polishing pad surface in advance, preventing the development of unevenness and corrosion before they adversely affect substrate production, thereby maintaining both high productivity and reliable surface quality.
Solution Approach 2:
The patent enables continuous conditioning of the polishing pad surface throughout its usage period. The conditioning apparatus operates continuously or periodically to maintain the polishing pad surface quality, ensuring that the pad remains effective for substrate processing without interruption to overall productivity.
3Manufacturing precision
If pressing force on the conditioning member is increased to improve conditioning effectiveness, then surface uniformity improves, but the device complexity increases due to need for precise control mechanisms
Solution Approach 1:
The patent introduces a stopper member as an intermediary element between the cylinder member and the first pressing member. This stopper member serves as a mechanical mediator that translates the expansive force from the cylinder member into controlled pressing force on the conditioning member, simplifying the control system while achieving precise pressing force application and uniform polishing pad surface treatment.
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 apparatus effectively conditions the polishing pad, ensuring uniformity and extending its lifespan by finely adjusting pressing forces and monitoring pad wear, thereby improving substrate yield.
Implementation Method 1
a first pressing member connected to the cylinder member and configured to press the conditioning member by movement of the cylinder member along the first direction
Implementation Method 2
a stopper member arranged to be movable along a second direction parallel to the first direction in the internal space of the housing so that a position of the first pressing member reaches a target position
Implementation Method 3
a second pressing member arranged in the internal space of the housing and configured to press the first pressing member by movement of the stopper member along the second direction
Implementation Method 4
a photo sensor arranged between the second pressing member and the stopper member and configured to detect an origin position of the stopper member
Data Source
AI summary
A conditioning apparatus for conditioning a polishing pad includes a housing including an internal space formed along a longitudinal direction, a conditioning member connected to the housing and configured to condition a surface of the polishing pad, a cylinder member arranged to be movable along a first direction parallel to the longitudinal direction in the internal space of the housing, a first pressing member connected to the cylinder member and configured to press the conditioning member by movement of the cylinder member along the first direction, and a stopper member arranged to be movable along a second direction parallel to the first direction in the internal space of the housing so that a position of the first pressing member reaches a target position. In addition to these, various other embodiments may be possible.