CMP Pad Conditioner Movable Weight Force Control
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Solution Overview
Problem
Conventional CMP pad conditioning systems lack the ability to dynamically adjust the pressing force during operation, leading to variations in polishing performance due to fixed or passively controlled force applications, which cannot conform to different polishing pad materials effectively.
Innovation Solution
A method and apparatus that includes a moveable weight member along an arm, allowing for selective positioning to adjust the pressing force between the abrasive member and the polishing pad, with a controllable drive screw and external control unit to dynamically maintain or alter the force based on detected conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed pressing force is applied during CMP pad conditioning, then the apparatus structure is simple, but the polishing performance varies and cannot adapt to different pad materials
Solution Approach 1:
The patent applies the dynamics principle by replacing the fixed pressing force mechanism with a movable weight system. The weight can be repositioned along the arm to dynamically adjust the pressing force applied to the CMP pad, enabling adaptation to different pad materials and conditioning requirements while maintaining a relatively simple mechanical structure.
Solution Approach 2:
The patent implements parameter changes by allowing the pressing force parameter to be varied through weight repositioning. This enables the system to optimize conditioning parameters for different pad materials and process requirements, transforming a static system into one with adjustable parameters without requiring complex control mechanisms.
2Productivity
If the pressing force is increased to improve conditioning effectiveness, then the material removal rate increases, but the risk of pad damage and force control precision decreases
Solution Approach 1:
The movable weight system allows dynamic adjustment of pressing force, enabling the operator to optimize the force level for maximum material removal while maintaining sufficient control precision. The mechanical leverage system provides fine control over the applied force through small weight repositioning movements.
Solution Approach 2:
The system allows preliminary setting of the pressing force by positioning the weight before conditioning begins. This preliminary action enables optimization of the force parameter for the specific pad material and process requirements, ensuring both effective material removal and controlled force application from the start of the 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
Enables precise and adaptive conditioning of the CMP pad, improving polishing performance by allowing real-time adjustments of the pressing force to match the specific requirements of various pad materials, thereby enhancing material removal selectivity and consistency.
Implementation Method 1
an abrasive member, such as a member 12 coated with an abrasive, such as diamond, is pressed, relatively, against a surface of the polishing pad
Implementation Method 2
A method and apparatus that includes a moveable weight member along an arm, allowing for selective positioning to adjust the pressing force between the abrasive member and the polishing pad
Data Source
AI summary
The present invention relates to a method and apparatus for conditioning a polishing pad used in chemical mechanical polishing in which a consistent pressing force can be provided between an abrasive conditioning member and the polishing pad. Specifically, a moveable weight member is provided that can be selectively moved along a length of a support arm in the conditioning apparatus. The position of the weight member relative to the position at which the abrasive conditioning member is mounted alters the resultant pressing force in view of the change in moment created. In a particular example, the positioning of the weight member can be automatically controlled using a drive mechanism controlled by a control unit, such as a computer. In a more particular example, the positioning of the weight member can be dynamically controlled if the control unit receives an external feedback upon which its control of the weight member position is based, such as a detected value of the pressing force exerted by the abrasive conditioning member. Finally, if the apparatus is appropriately arranged to permit the weight member to travel to an opposite side of the location at which the support arm is mounted from the abrasive conditioning member, then a “negative pressing force” can be generated, such that effective pressing forces less than the resting weight of the pad conditioning apparatus can be realized.