Patent ID: 7666069

Claim:
A wafer conveyor system comprising: guide rails disposed inside a chamber; a driving roller disposed on one end of each guide rail and a passive roller disposed on the other end, wherein an inner surface of each guide rail contacts and wraps around the driving roller and passive roller; and a wafer holder disposed between the guide rails, wherein the wafer holder is connected to the guide rails allowing the wafer holder to move in conjunction with a driving direction for the guide rails, wherein the wafer holder comprises: a base plate having an opening and a guide groove formed along the opening, wherein the base plate is connected to the guide rail; a cylindrical roller installed on the base plate adjacent to the guide groove, wherein the cylindrical roller is threaded, and a supporter ring having sawtooth-shaped protrusions provided in the guide groove, wherein the sawtooth-shaped protrusions engage the thread of the cylindrical roller.