Substrate Transfer Arm Guide for Precise Wafer Alignment
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Solution Overview
Problem
Conventional substrate transfer apparatuses often result in substrate misalignment during transfer, leading to adverse effects on the semiconductor manufacturing process due to the lack of precise alignment mechanisms.
Innovation Solution
A substrate transfer apparatus with a guide member system that includes first and second guides, which align the substrate without the need for a separate driving system, ensuring accurate positioning through the use of touch blocks and plungers that contact the substrate during the transfer arm's movement between contract and expand positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional substrate transfer apparatus uses a hand to support the substrate during transfer, then the structure is simple, but the substrate alignment precision deteriorates leading to misplacement and process disruptions
Solution Approach 1:
The guide member is divided into multiple segments including a first guide, second guide, and third guide, each responsible for guiding different sides of the substrate. This segmentation allows precise control of substrate alignment while maintaining a relatively simple overall structure by distributing the alignment function across multiple simple guide elements rather than one complex alignment mechanism.
Solution Approach 2:
The guide member acts as an intermediary element between the transfer arm and the substrate. It mediates the transfer process by providing physical guidance through touch blocks that contact the substrate sides, ensuring accurate positioning without requiring complex active control systems. The guide member translates the transfer arm's movement into precise substrate alignment.
2Manufacturing precision
If a separate driving system is added to achieve substrate alignment during transfer, then the alignment precision improves, but the device complexity and cost increase
Solution Approach 1:
The guide member utilizes the existing movement of the transfer arm to achieve alignment automatically. As the transfer arm moves the substrate from the first position to the second position, the guide member's touch blocks naturally guide the substrate into the correct orientation without requiring separate driving motors or actuators. The system serves itself by converting the transfer motion into alignment action.
Solution Approach 2:
The transfer arm serves dual functions: transferring the substrate from one position to another and simultaneously aligning the substrate through the guide member. This multi-functionality eliminates the need for a separate alignment driving system, reducing device complexity while maintaining alignment precision.
3Reliability
If the guide member uses touch blocks that contact the substrate during transfer, then the alignment reliability improves, but the risk of substrate damage increases
Solution Approach 1:
The touch blocks contact only specific local regions (the sides) of the substrate rather than applying force across the entire substrate surface. This localized contact provides sufficient guidance for alignment while minimizing the risk of damage. The third guide specifically contacts the opposite side to the first guide, providing balanced local support.
Solution Approach 2:
The guide member is designed to gently guide the substrate into position before the transfer arm completes its movement. The touch blocks establish contact and provide guidance in advance, preventing sudden movements or misalignments that could damage the substrate during the transfer process.
Data Source
AI summary
The inventive concept provides a substrate transfer apparatus. The substrate transfer apparatus includes a base; a first transfer arm configured to have a first arm link connected to the base and a first end effector connected to the first arm link, and which operates between a contract position and an expand position; and a guide member aligning a substrate placed on the first end effector while the first transfer arm backwardly moves from the expand position to the contract position.