Linear Robot Arm Layout for Contamination-Free Substrate Swapping

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Solution Overview

Problem

Existing substrate transport robots in vacuum environments face contamination risks due to upper rotating joints passing over lower wafers, and require cumbersome bridges for substrate swapping, which complicates transport and increases system footprint and cost.

Innovation Solution

A substrate transport apparatus with linearly driven upper and lower end effector structures, featuring spaced paddles and independent motion, eliminating the need for rotating joints and bridges, utilizing linear motors, magnetic levitation, and pulley systems for efficient substrate handling.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If upper rotating joints are used to enable arm movement, then the robot can perform substrate transport operations, but contamination risk increases due to joints passing over lower wafers

Engineering Contradiction:

Improverobot arm movement capabilityVSAvoidcontamination risk

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The patent replaces the traditional rotating joint mechanism with a linear motion system. The upper and lower arm structures move linearly along guide rails rather than rotating, eliminating the mechanical joints that would pass over substrates. This substitution of mechanical rotation with linear translation resolves the contamination issue while maintaining transport capability.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The invention extracts and removes the rotating joint component from the upper arm structure. By eliminating the rotating joint entirely and replacing it with a linearly driven end effector structure, the source of contamination is removed from the system while the essential function of substrate transport is preserved through alternative linear motion mechanisms.

Inventive Principle:

Principle #2Taking out (Extraction)

2Adaptability or versatility

If bridges are added to enable substrate swapping, then substrate exchange capability is improved, but device complexity and footprint increase

Engineering Contradiction:

Improvesubstrate swapping capabilityVSAvoidbridge structure complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent merges the substrate swapping function into the linear motion system itself. The upper and lower end effector structures, already designed for linear transport, are configured to work together through coordinated linear movements to perform substrate exchange. This eliminates the need for separate bridge structures, reducing device complexity while maintaining swapping capability.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The linearly driven end effector structures serve multiple functions: they perform both substrate transport and substrate swapping operations. By designing the upper and lower arm structures to be universally capable of both functions through coordinated linear motion, the invention eliminates the need for specialized bridge structures, reducing overall system complexity and footprint.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Ease of operation

If traditional rotating joint mechanisms are used, then substrate transport is enabled, but system footprint and cost increase due to required bridge structures

Engineering Contradiction:

Improvesubstrate transport capabilityVSAvoidsystem footprint

Core Design Contradiction:

Ease of operationVSArea of stationary object

Solution Approach 1:

The patent replaces the traditional rotating joint mechanism with a linear motion system using guide rails and linear actuators. This substitution eliminates the need for large bridge structures that would be required to accommodate rotating joints and substrate swapping, thereby reducing the system footprint while maintaining full substrate transport capability.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The invention transitions from a rotational degree of freedom to linear translational motion. By moving the end effector structures along linear paths in a different dimensional approach (rather than rotating around joints), the system achieves substrate transport without requiring the horizontal space needed for bridges, effectively utilizing vertical and linear spatial dimensions to reduce overall footprint.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

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

Enables fast and contamination-free substrate swapping without bridges, enhancing throughput and reducing system footprint and cost, while maintaining high operational efficiency.

Implementation Method 1

magnetic levitation means

Methodology Applied

Scientific EffectMagnetic levitation: Maglev

Implementation Method 2

linear motor

Methodology Applied

Scientific EffectLinear motor: Linear Motor

Data Source

PatentUS12528197B2Linear robot arm with multiple end effectors

Publication Date: 2026.01.20 PERSIMMON TECHNOLOGIES CORP

AI summary

A substrate transport apparatus including a lower linearly driven effector structure with spaced paddles, and an upper linearly driven end effector structure with spaced paddles and no rotating joints above a paddle of the lower end effector structure. A drive subsystem is configured to linearly drive the lower end effector structure and to linearly drive the upper end effector structure independent of the lower end effector structure.