Transfer Arm Suction Layout for Warped Substrate Handling
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Solution Overview
Problem
Existing substrate transfer apparatuses face challenges in efficiently transferring substrates with warpage, as they often rely on single-point adsorption which can lead to misalignment and dropout during transfer.
Innovation Solution
The substrate transfer apparatus incorporates a transfer arm with multiple adsorption units and suction passages, allowing for simultaneous adsorption of substrates by multiple points. This design ensures stable holding and proper transfer even when substrates are warped.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If single-point adsorption is used to transfer substrates, then the device complexity is reduced, but the reliability of substrate transfer deteriorates due to misalignment and dropout during transfer of warped substrates
Solution Approach 1:
The adsorption unit is segmented into multiple adsorption portions (first through fourth adsorption portions) arranged at different positions. Each portion independently adsorbs a different region of the substrate, allowing the system to handle warped substrates by distributing adsorption forces across multiple segments rather than relying on a single adsorption point.
Solution Approach 2:
The system changes the adsorption parameters by providing multiple adsorption portions with different adsorption capabilities. The control unit selectively activates specific adsorption portions based on substrate conditions, changing the effective adsorption configuration to match the substrate state and maintain reliable transfer.
2Reliability
If multiple adsorption units are provided to handle warped substrates, then the reliability of substrate transfer is improved, but the device complexity increases with multiple suction passages and adsorption units
Solution Approach 1:
Multiple adsorption portions are merged into a single integrated adsorption unit structure. The first through fourth adsorption portions are combined within one adsorption unit, sharing common structural elements and control mechanisms, which reduces overall system complexity compared to having completely separate adsorption devices.
Solution Approach 2:
The adsorption unit is designed with multi-functionality by incorporating multiple adsorption portions that can operate independently or in combination. This universal design allows the same adsorption unit to handle various substrate conditions (flat or warped) without requiring multiple specialized devices.
3Productivity
If multiple adsorption portions are used to prevent dropout, then the productivity of substrate transfer is improved, but the manufacturing precision requirements increase to ensure proper alignment of multiple adsorption units
Solution Approach 1:
The adsorption portions are arranged in an asymmetric configuration optimized for handling warped substrates. The first through fourth adsorption portions are positioned at specific locations that account for typical warpage patterns, reducing the need for high-precision alignment compared to a symmetric arrangement.
Solution Approach 2:
Different adsorption portions are designed with local quality variations to match different regions of the substrate. Each adsorption portion can be optimized for its specific location and function, allowing the system to maintain high productivity without requiring uniform high-precision alignment across all portions.
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
The apparatus effectively transfers substrates with warpage by ensuring multiple points of adsorption, preventing misalignment and dropout, and enabling efficient movement between processing modules.
Implementation Method 1
a plurality of adsorption units provided in the at least one arm portion and each including a suction port that adsorbs a peripheral edge of a back surface of the substrate, and a plurality of suction passages provided in the at least one arm portion
Data Source
AI summary
A substrate transfer apparatus includes a transfer arm which includes a base portion; at least one arm portion connected to the base portion to extend from the base portion; a plurality of adsorption units provided in the at least one arm portion and each including a suction port that adsorbs a peripheral edge of a back surface of the substrate; and a plurality of suction passages provided in the at least one arm portion. The adsorption units include a first adsorption unit group including a first adsorption unit and a second adsorption unit; and a second adsorption unit group including a third adsorption unit and a fourth adsorption unit. The suction passages include a first suction passage connected to the suction ports of the first and second adsorption units, and a second suction passage connected to the suction ports of the third and fourth adsorption units.