Patent · US Expired

Wafer transfer machine

US5193969A · kind A · utility

340Cited by
9References
9Claims
0Family size

Assignee

Inventors

Key dates

Filing dateMay 20, 1991
Grant dateMar 16, 1993
Priority date
Expiry dateMay 20, 2011

Classification

  • Technology area (CPC Y)Emerging Cross-Sectional Technologies
  • CPC primaryY10S414/138
  • WIPO fieldSemiconductors
  • WIPO sectorElectrical engineering

Abstract

The present invention is a rotary, 3-stage wafer transfer machine. The transfer machine utilizes a pneumatically powered lift mechanism to raise wafers from a boat to a retaining area. If the next operation for the wafer is a single density operation (twenty-five wafers per boat), the wafers are the simply transferred to another boat for further processing. If the next operation for the wafers requires double density (fifty wafers per boat), a second set of wafers is lifted to the retaining area, where they are interspersed with the first set to create a double density set of fifth wafers. This set is then transferred to the appropriate boat (generally a quartz boat) for further processing. All components that could generate particulate contamination are sealed off from the transfer area. Extra duty materials are used for the components of the machine to provide unique reproducibility and eliminate much of the required maintenance as compared to the prior art. Lack of contamination and superior reproducibility allow increased yield in the manufacturing process.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.