Polishing Head Temperature Feedback for Large Glass Substrates
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Solution Overview
Problem
Polishing glass substrates with large planar areas poses challenges in maintaining optimal polishing conditions, particularly in real-time temperature control, which can lead to substrate processing failures and reduced yield due to inadequate temperature management.
Innovation Solution
A substrate processing apparatus equipped with a polishing head unit that includes a polishing pad fixing ring with a metal construction and an optical temperature sensor to measure the temperature of the polishing pad in real time, allowing for dynamic adjustment of the polishing head's movement based on temperature readings to prevent overheating or underheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If real-time temperature monitoring is implemented using a temperature sensor, then temperature control reliability is improved, but device complexity increases
Solution Approach 1:
The polishing pad fixing ring serves as an intermediary element that performs dual functions: mechanically securing the polishing pad to the polishing head while simultaneously acting as a mounting structure for the temperature sensor. This intermediary component enables temperature monitoring without requiring separate dedicated sensor mounting mechanisms, thus improving temperature control reliability while minimizing additional device complexity
Solution Approach 2:
The polishing pad fixing ring is designed with multi-functionality, serving both as a mechanical attachment component and as a sensor mounting platform. By integrating the temperature sensor mounting function into the existing fixing ring structure, the system achieves reliable temperature monitoring without adding separate complex mounting mechanisms, thereby resolving the contradiction between reliability improvement and complexity increase
2Manufacturing precision
If the polishing head adjusts pressing force and rotational speed dynamically, then polishing precision is improved, but control system complexity increases
Solution Approach 1:
The system implements feedback control by continuously monitoring the temperature of the polishing pad through the temperature sensor and using this information to dynamically adjust the pressing force and rotational speed of the polishing head. This feedback mechanism enables precise polishing by maintaining optimal temperature conditions, while the control adjustments are integrated into the existing polishing head operations without requiring entirely new control systems
Solution Approach 2:
The polishing head operates dynamically by continuously adjusting its pressing force and rotational speed based on real-time temperature feedback from the polishing pad. This dynamic adjustment capability allows the system to maintain optimal polishing conditions throughout the process, improving polishing precision while utilizing adaptive control rather than static predetermined parameters
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 enables real-time temperature monitoring and control, preventing substrate processing failures and improving yield by adjusting the pressing force and rotational speed of the polishing head in response to temperature deviations from a reference point, ensuring consistent and efficient polishing of large area substrates.
Implementation Method 1
a temperature sensor... measuring a temperature of the polishing pad by sensing a temperature of the polishing pad fixing ring
Data Source
AI summary
A substrate processing apparatus includes: a conveyor belt configured to have an outer surface on which a bottom surface of a substrate is seated; and a polishing head unit configured to face an upper surface of the substrate, wherein the polishing head unit includes: a polishing head connected to a driver; a polishing pad configured to face the polishing head; a polishing pad fixing ring disposed between the polishing head and the polishing pad; and a temperature sensor configured to overlap the polishing pad fixing ring and to be spaced apart from the polishing pad fixing ring.