CMP Pad Conditioner With Pneumatic Pressure Sensing
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Solution Overview
Problem
Conventional pad conditioners in chemical mechanical planarization (CMP) apparatuses struggle to accurately detect the pressure of the conditioning disk against the polishing pad in real-time, leading to potential damage to the polishing pad and subsequent wafer yield issues due to abnormal pressure deviations.
Innovation Solution
A pad conditioner equipped with a swing arm, adjusting assembly, conditioning disk, pressure detecting unit, and control unit, which uses an airtight chamber to measure internal gas pressure for precise and timely detection of conditioning pressure, preventing abnormal pressure and reducing human intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the conditioning disk is lowered to contact the polishing pad for conditioning, then the polishing pad can be cleaned effectively, but the pressure control becomes difficult to monitor in real-time, leading to potential pad damage
Solution Approach 1:
The patent replaces direct mechanical pressure measurement with a pneumatic measurement system. The airtight chamber filled with gas transmits the conditioning disk's contact pressure to the pressure detecting unit, enabling non-contact, real-time pressure monitoring without interfering with the mechanical conditioning process.
Solution Approach 2:
The patent introduces an intermediary pneumatic system between the conditioning disk and the measurement device. The gas-filled airtight chamber acts as a mediator that transmits pressure information from the conditioning interface to the pressure sensor, allowing indirect but accurate pressure detection.
2Ease of operation
If manual pressure monitoring is used during conditioning, then operational simplicity is maintained, but productivity decreases due to frequent manual interventions and yield loss from undetected pressure deviations
Solution Approach 1:
The patent implements a closed-loop feedback system where the pressure detecting unit continuously monitors the conditioning pressure and sends signals to the control unit. The control unit automatically adjusts the swing arm position or conditioning disk pressure to maintain optimal values, eliminating manual intervention and preventing yield loss from pressure deviations.
Solution Approach 2:
The system performs self-monitoring and self-adjustment of conditioning pressure. The automated detection and control mechanisms enable the pad conditioner to regulate its own operation without external intervention, maintaining optimal performance continuously and improving overall productivity.
3Device complexity
If no pressure detection system is installed, then device complexity is reduced, but the polishing pad may be damaged due to unmonitored pressure deviations
Solution Approach 1:
The patent uses a pneumatic measurement approach instead of complex mechanical pressure sensors at the conditioning interface. The gas-filled airtight chamber provides a simpler, more reliable pressure transmission mechanism that reduces device complexity while effectively preventing pad damage through real-time monitoring.
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
Enables accurate and timely detection of conditioning pressure, minimizing damage to the polishing pad and wafer products while reducing labor costs associated with manual pressure measurement.
Implementation Method 1
an adjusting assembly (12), disposed at one end of the swing arm (11) and comprising an airtight chamber (128); a conditioning disk (13), disposed on one side of the adjusting assembly (12) that is away from the swing arm (11), wherein the adjusting assembly (12) is configured to drive the conditioning disk (13) to move in a direction towards or away from the adjusting assembly (12) by deformation of the airtight chamber (128)
Implementation Method 2
a pressure detecting unit (14), embedded in the airtight chamber (128) and configured to detect an internal gas pressure within the airtight chamber (128)
Data Source
AI summary
A pad conditioner and a chemical mechanical planarization apparatus, wherein the pad conditioner comprises a swing arm; an adjusting assembly disposed at one end of the swing arm, wherein the adjusting assembly comprises an airtight chamber; a conditioning disk, disposed on one side of the adjusting assembly that is away from the swing arm, wherein the adjusting assembly is configured to drive the conditioning disk to move in a direction towards or away from the adjusting assembly by deformation of the airtight chamber; a pressure detecting unit, embedded in the airtight chamber and configured to detect an internal gas pressure within the airtight chamber; and a control unit, configured to determine a wording state of the pad conditioner based on the internal gas pressure.