Substrate Transport Arms With Mechanical Motion Switching
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Solution Overview
Problem
Conventional multiple arm substrate transport apparatuses require complex motor arrangements, leading to increased control system burden, potential motor failures, and higher costs, while also occupying valuable space in substrate processing chambers, limiting the integration of other components like vacuum pumps.
Innovation Solution
A substrate transport apparatus with independently movable arms utilizing a mechanical switch mechanism, allowing for combined rotational and independent pick/place motion with as few as two controllable motors, integrated into the vacuum transport chamber walls to enable efficient space use and reduced complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional multiple arm substrate transport apparatus uses complex motor arrangements with three or more motors, then the transport can achieve three degrees of freedom movement, but the control system burden increases and the cost increases
Solution Approach 1:
The patent combines multiple motor functions into a single motor by integrating a mechanical switch mechanism that routes the motor's rotational output to different arms sequentially. The single motor serves multiple arms through time-multiplexed operation, reducing the total motor count from three or more to one while maintaining the capability to move multiple arms with three degrees of freedom.
Solution Approach 2:
The mechanical switch mechanism dynamically redirects the motor's output to different arms based on operational requirements. The system transitions between static motor assignments and dynamic routing, allowing the same motor to serve different arms at different times, thereby reducing overall system complexity while preserving movement versatility.
2Ease of operation
If conventional multiple arm substrate transport apparatus uses three or more motors, then the transport can achieve independent control of multiple arms, but the potential for motor failure increases
Solution Approach 1:
The patent merges multiple motor functions into a single motor through a mechanical switch mechanism. This consolidation reduces the number of motors from three or more to one, thereby reducing the potential failure points in the system. The single motor maintains independent control capability by sequentially directing power to different arms through the mechanical switch, preserving operational independence while improving reliability.
3Adaptability or versatility
If conventional multiple arm substrate transport apparatus uses complex motor arrangements, then the transport can provide full range of motion, but the space available for other substrate processing components is limited
Solution Approach 1:
The patent consolidates multiple motors into a single motor with a mechanical switch mechanism, dramatically reducing the space required for the drive system. This space reduction allows vacuum pumps and other substrate processing components to be integrated into the chamber, as the single motor occupies significantly less volume than three or more motors would require.
Solution Approach 2:
The patent extracts the unnecessary complexity of multiple motors from the system, retaining only the essential function of moving multiple arms. By removing redundant motors and keeping a single motor with intelligent routing, the system frees up chamber space for other components while maintaining full arm motion capability through the mechanical switch mechanism.
4Manufacturing precision
If conventional multiple arm substrate transport apparatus uses three or more motors, then the transport can achieve precise positioning, but the cost of the transport increases
Solution Approach 1:
The patent combines multiple motor functions into a single motor through a mechanical switch mechanism, reducing the system from three or more motors to one. This consolidation maintains precise positioning capability because the mechanical switch provides reliable, repeatable routing of motor output to different arms, preserving positioning precision while reducing cost by eliminating redundant motors.
Solution Approach 2:
The mechanical switch mechanism creates functional copies of motor output to different arms at different times. Rather than having physical copies (multiple motors), the system uses a single motor whose output is copied and routed to different arms sequentially through the mechanical switch, maintaining positioning precision at reduced cost.
Data Source
AI summary
A substrate transport apparatus including a frame, a drive section connected to the frame and including at least one independently controllable motor, at least two substrate transport arms connected to the frame and comprising arm links arranged for supporting and transporting substrates, and a mechanical motion switch coupled to the at least one independently controllable motor and the at least two substrate transport arms for effecting the extension and retraction of one of the at least two substrate transport arms while the other one of the at least two substrate transport arms remains in a substantially retracted configuration.