Patent ID: 8955406
Filing Date: 2015-02-17
Classification: H01L,Y10T

Abstract:
1. A workpiece transfer apparatus comprising: a workpiece transfer mechanism configured to transfer a workpiece inside a vacuum chamber; a base member that rotates the workpiece transfer mechanism from outside of the vacuum chamber; and a vacuum seal unit configured to seal a gap between the workpiece transfer mechanism and the base member, wherein the vacuum seal unit includes: the annular seal members adjacent to each other with a spacing therebetween, out of the plurality of annular seal members, and the rotating shaft define a first space and a second space independent from each other and respectively surrounding the outer circumferential surface of the rotating shaft, an end portion of the cooling flow passage communicates with a portion of the outer circumferential surface of the rotating shaft corresponding to the first space, and the other end portion of the cooling flow passage communicates with a portion of the outer circumferential surface of the rotating shaft corresponding to the second space, so as to allow the coolant introduced into the second space to flow through the cooling flow passage and to reach the first space, even when the rotating shaft is rotating about the axial center.