Patent ID: 6533530
Filing Date: 2003-03-18
Classification: B25J,H01L

Abstract:
A wafer transferring robot comprising:a fixed base, a rotating base mounted for rotation on said fixed base, a driving motor mounted on said fixed base and being operably connected to said rotating base for moving said rotating base with respect to said fixed base, two horizontally extensible robot arms arranged laterally symmetrically with respect to each other on the rotating base and each comprising first arm elements, second arm elements and third arm elements vertically spaced with respect to each other, each of said first and second arm elements being defined by hollow casing structure containing spaced pulleys fixedly attached to a pully shaft and having an interconnecting belt, a driving motor for driving said first arm element at one end with said driving motor, a bearing at the other end of said first arm element receiving a pully fixed to a first pivot interconnecting said first and second arm elements, said pivot attaching fixed pulleys at ends thereof disposed in said first and second arm elements respectively, a bearing in said second arm element for receiving a second pivot having a pully in said second arm element and having a belt therein interconnecting said pulleys, third arm elements vertically spaced above said second arm element and carrying a wafer-bearing chuck, wherein the second arm element in one robot arm is disposed at a height greater than the second arm element in the other robot arm to dispose said third arm element of said other robot arm below, and in opposition to, the second arm element of said one robot arm.