Wafer Cassette Carousel Positioning for Clean Epitaxial Loading

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Solution Overview

Problem

Existing wafer cassette loading and unloading systems for epitaxial reactors are difficult to interface with automated systems, require manual operation, and expose wafers to contamination risks during loading and unloading.

Innovation Solution

A wafer cassette loading and unloading system that includes a carousel platform and support platforms, allowing for easy rotation and positioning of cassettes to facilitate automated or manual loading and unloading while minimizing exposure to contamination.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a platform pivotally hinged to a shaft is used to load and unload wafer cassettes, then the system can accommodate multiple cassettes and allow manual operation, but it becomes difficult to interface with automated loading and unloading systems

Engineering Contradiction:

ImproveAbility to accommodate multiple cassettes and manual operationVSAvoidInterface capability with automated loading and unloading systems

Core Design Contradiction:

Adaptability or versatilityVSExtent of automation

Solution Approach 1:

The system separates the cassette support function from the positioning function. Support platforms hold cassettes while the carousel platform provides automated positioning. This segmentation allows automated systems to interface with the carousel while support platforms can be configured for different cassette arrangements.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The carousel platform serves multiple functions: it positions cassettes for automated handling, supports multiple cassettes simultaneously, and can be configured to work with different cassette orientations. This multi-functionality resolves the contradiction between adaptability and automation interface capability.

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:

ImproveSimplicity of manual loading and unloading operationVSAvoidRisk of wafer contamination or damage

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The support platform acts as an intermediary between the operator and the wafer cassette. It allows cassettes to be loaded and unloaded from the rear side without direct operator contact with the front side, reducing contamination risk while maintaining operational simplicity through the platform interface.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

Instead of having the operator interact with the front side of the cassette, the system inverts the approach by enabling loading and unloading from the rear side. This inversion protects the wafer front surfaces from contamination while achieving the same operational goal.

Inventive Principle:

Principle #13The other way round (Inversion)

3Productivity

If multiple wafer cassettes are loaded onto the platform adjacent to each other, then test and final processing can be performed simultaneously, but the system complexity and difficulty of automated interface increases

Engineering Contradiction:

ImproveAbility to perform test and final processing simultaneouslyVSAvoidComplexity of automated interface and cassette positioning

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

Each cassette is placed on its own support platform, segmenting the handling of multiple cassettes. The carousel platform independently positions each support platform, simplifying the automated interface while enabling simultaneous processing of multiple cassettes in different orientations.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system uses multiple levels or angular positions on the carousel platform to accommodate multiple cassettes. By utilizing the rotational dimension and angular positioning, the system can hold multiple cassettes in different orientations simultaneously without increasing linear complexity.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Data Source

PatentUS20250112074A1Wafer cassette loading and unloading system for an epitaxial reaction and an epitaxial reactor

Publication Date: 2025.04.03 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.