Reactive ion etching appartus

Claim 1

A reaction ion etching apparatus comprising a buffer room which contains: a first reactive chamber, a second reactive chamber placed adjoining said first reactive chamber in a first direction, a first stage member disposed adjoining said first reactive chamber in a second direction perpendicular to said first direction, a second stage member disposed adjoining said second reactive chamber in said second direction, the centers of said first and second reactive chambers and said first and second stage members are respectively at corners of a square; a first transfer arm positioned and arranged for transferring a wafer from said first stage member to said first reactive chamber, a second transfer arm positioned and arranged for transferring said wafer among said first and second reactive chambers and said first and second stage members, said second transfer arm having a pivot point at the center of said square so as to be turnable through 360°, and a third transfer arm positioned and arranged for transferring said wafer from said second reactive chamber to said second stage member; said first, second and third transfer arm each positioned and arranged for transferring wafers along a path defined by the length of their respective arms wherein all three arms may be moved simultaneously by moving said first transfer arm and said third transfer arm in one of two directions, clockwise or counterclockwise, while moving said second transfer arm in the other of said two directions.