Patent ID: 6692049
Filing Date: 2004-02-17
Classification: H01L,Y10S

Abstract:
An improved system for handling wafers comprising, in combination:a hand assembly, forward and rearward extensions for grasping, transporting and releasing said wafer to be handled, the forward extension for grasping being reversibly rotateable between positions parallel to, and perpendicular to, the plane of the hand assembly, control means for programming and implementing a desired sequence of operations; a grasping pressure applied to the wafer by the forward and rearward extensions being controlled by an electrically activated means operatively connected to at least one of the forward or rearward extensions, the grasping pressure being controlled by setting, at a predetermine level, the current fed to the electrically activated means wherein the improvement comprises the addition of biasing means which operate to apply a grasping pressure to the wafer if delivery of controlling electrical current to the electrically activated means is interrupted.