Patent ID: 6511543
Filing Date: 2003-01-28
Classification: H01L

Abstract:
A holding device for transporting a disc-shaped workpiece in a vacuum unit, the workpiece being transferable between a lower end position, in which the workpiece is inserted or removed, and an upper end position, in which the workpiece is processed, the holding device comprising:a raisable and lowerable lifting table having a support plate corresponding essentially to the shape of the workpiece and being at least approximately rotationally symmetrical about a vertical axis; a support ring for holding the workpiece in the lower end position; a vertically displaceable clamping ring arranged above the support plate for retaining the workpiece in the upper end position; a centring device for centering the support ring and the clamping ring concentrically relative to the vertical axis of the support plate, the centring device engaging the support ring, clamping ring and support plate at least in the upper end position; and at least two centring elements of the centring device spaced a distance away from the vertical axis, the at least two centring elements not being aligned all together with the vertical axis in a plane, and being essentially without play azimuthally relative to the support ring, clamping ring and support plate, and engaging at least the support ring and clamping ring in a radially displaceable manner, with at least the clamping ring further being axially displaceable, wherein the support ring, clamping ring and support plate are secured to prevent mutual rotation about the vertical axis.