Substrate Holding Device Wear Detection via Position Sensors
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Solution Overview
Problem
Conventional substrate holding devices lack a means to accurately detect wear in the contact gripping parts, leading to unpredictable replacement times due to varying usage conditions.
Innovation Solution
A substrate holding device equipped with multiple rotation parts, a moving mechanism, and sensors to detect the position of the rotation parts and substrate, allowing for the detection of wear by comparing initial and current positions, and optionally an alarm for timely replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If replacement time is predicted based on predetermined usage periods, then replacement can be performed in advance, but replacement may occur too early or too late due to variations in wear conditions
Solution Approach 1:
The patent replaces the mechanical/time-based replacement system with an optical detection system. Sensors detect the actual position of rotation parts and compare them against reference values to determine wear程度, enabling precise replacement timing based on actual wear state rather than predetermined time periods
Solution Approach 2:
The patent implements a feedback mechanism where sensors continuously monitor the position of rotation parts, compare actual positions against reference values stored in memory, and provide feedback signals when wear reaches predetermined thresholds. This closed-loop feedback enables accurate determination of replacement timing based on actual wear conditions
2Measurement precision
If no wear detection means is provided, then the device structure remains simple, but replacement timing cannot be accurately determined
Solution Approach 1:
The patent introduces optical sensors and electronic processing systems to detect wear, replacing the need for complex mechanical wear measurement mechanisms. The detection system uses light-based sensing to measure position changes of rotation parts, providing accurate wear detection with relatively simple device architecture
Solution Approach 2:
The patent uses sensors as intermediary elements that translate physical wear (position changes) into detectable electrical signals. These intermediaries enable indirect but accurate measurement of wear without requiring direct contact or complex mechanical measurement mechanisms
Data Source
AI summary
A substrate holding device includes at least three rotation parts each including a contact gripping part that contacts a periphery portion of a substrate and rotates the substrate, a moving mechanism moving at least one of the at least three rotation parts toward the substrate to cause a plurality of contact gripping parts to grip the substrate, a first sensor detecting a position of a moving rotation part, which is a rotation part moved by a moving mechanism, and a detection unit storing a first initial position, which is a position of the moving rotation part when the plurality of contact gripping parts grip the substrate in a state where the plurality of contact gripping parts are not worn, and detecting occurrence of wear of the contact gripping parts on the basis of a difference between a current position of the moving rotation part and the first initial position.