Wafer Cassette Carousel Loading With Coaxial Actuation

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Solution Overview

Problem

Existing wafer cassette loading and unloading systems for epitaxial reactors are difficult to interface with automated systems like SMIF, AGV, or AMR, require manual operation, expose wafers to contamination risk, and have complex moving parts that can damage wafers.

Innovation Solution

A wafer cassette loading and unloading system with a carousel platform and support platforms that pivot around coaxial shafts, allowing automated or manual operation, minimizing wafer exposure, and using non-contact detection to avoid contamination and damage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If a platform pivotally hinged to a shaft is used for wafer cassette loading and unloading, then the system can operate manually with simple structure, but it is difficult to interface with automated loading and unloading systems

Engineering Contradiction:

Improvemanual operation capabilityVSAvoidinterface with automated systems

Core Design Contradiction:

Ease of operationVSAdaptability or versatility

Solution Approach 1:

The loading and unloading system is designed to perform multiple functions: it can operate manually when the front side of the cassette faces the operator, and can also interface with automated loading and unloading systems when the rear side faces outward. This multi-functionality resolves the contradiction between ease of manual operation and adaptability to automated systems.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Ease of operation

If the front side of the wafer cassette faces the operator during loading and unloading, then manual operation is simplified, but the risk of wafer contamination or damage increases

Engineering Contradiction:

Improvemanual loading and unloadingVSAvoidwafer contamination and damage risk

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

Instead of having the front side of the cassette face the operator during loading and unloading, the system is designed so that the rear side of the cassette faces outward toward the operator. This inversion allows manual operation while minimizing the risk of wafer contamination or damage, as the wafers remain protected inside the cassette.

Inventive Principle:

Principle #13The other way round (Inversion)

3Difficulty of detecting and measuring

If detection systems with wiring are used in the moving parts of the loading and unloading system, then detection functionality is achieved, but the complexity of the system increases and potential interference with moving parts occurs

Engineering Contradiction:

Improvedetection functionalityVSAvoidsystem complexity and wiring interference

Core Design Contradiction:

Difficulty of detecting and measuringVSDevice complexity

Solution Approach 1:

The patent replaces mechanical wiring-based detection systems with optical detection systems. Optical sensors and signal transmission through optical fibers eliminate the need for physical wiring in moving parts, reducing system complexity and avoiding interference with the mechanical movement of the loading and unloading mechanism.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Data Source

PatentUS20250372428A1Wafer cassette loading and unloading system for an epitaxial reactor with coaxial actuation system and an epitaxial reactor

Publication Date: 2025.12.04 LPE SPA

AI summary

A system for loading and unloading wafer cassettes for an epitaxial reactor, the system includes a carousel platform, configured to transport at least one cassette, wherein the carousel platform is pivotally able to be connected to the epitaxial reactor around a carousel axis; a carousel actuator, configured to drive the rotation of the carousel platform around the carousel axis in relation to the epitaxial reactor; at least one support platform, suitable to support at least one cassette, wherein at least one support platform is pivotally connected to the carousel platform around a rotation axis that differs from the carousel axis; a rotation actuator, configured to drive the rotation of at least one support platform around the rotation axis relative to the carousel platform.