Wafer Cassette Engaging Lock for Shifting Prevention
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Solution Overview
Problem
Conventional wafer cassettes and enclosures suffer from low operational precision and potential damage to wafers when accessed by robotic arms due to misalignment and shifting during transfer, leading to bouncing issues.
Innovation Solution
A wafer container with integrated wafer cassettes on all sides and an engaging lock system that prevents shifting by applying pressure to the cassette walls without contacting the wafers, ensuring secure and precise handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional mechanisms are used to hold wafer cassettes firmly, then shifting is prevented, but wafer damage occurs due to large manufacturing tolerance
Solution Approach 1:
The patent introduces a positioning mechanism with adjustable positioning members that act as intermediaries between the wafer cassettes and the pod walls. These positioning members can be precisely adjusted to contact the wafer cassettes at specific points, providing stable positioning without the excessive force or misalignment that would cause damage. The adjustable nature allows for precise positioning that accommodates manufacturing tolerances while preventing damage.
2Adaptability or versatility
If wafer cassettes are individually placed in pod, then flexibility is improved, but operational precision decreases
Solution Approach 1:
The patent implements a positioning mechanism that performs preliminary positioning of wafer cassettes within the pod before robotic access occurs. The positioning members are pre-adjusted to create precise reference positions for the cassettes, ensuring that when the robotic arm accesses the wafers, the operational precision is maintained. This preliminary positioning action allows individual cassette placement while establishing precise, repeatable positions for each cassette.
3Extent of automation
If robotic hand accesses wafers in conventional cassette, then automation is achieved, but bouncing occurs due to misalignment
Solution Approach 1:
The patent incorporates a positioning mechanism with adjustable positioning members that provide feedback-based positioning for wafer cassettes. The system can be adjusted based on the actual positions of the cassettes and the robotic arm's approach, ensuring proper alignment. This feedback mechanism prevents the bouncing issue by ensuring that the robotic hand approaches and contacts the cassette at the correct position, maintaining both automation and reliability.
Data Source
AI summary
Apparatus for carrying and shielding wafers includes a wafer container, a plurality of wafer cassettes disposed in the wafer container, and an engaging lock that prevents the wafer cassettes from shifting, the engaging lock being in direct contact with walls of the wafer cassettes.