Patent ID: 6761362
Filing Date: 2004-07-13
Classification: H01L,Y10T

Abstract:
A wafer holding device, comprising a rotating baseplate, a wafer seat which is provided on said rotating baseplate coaxially with said rotating baseplate and which receives a peripheral edge of a wafer by a circumference, a predetermined number of chuck levers rotatably mounted on said wafer seat so that said chuck levers can be rotated around an axis extending in a tangential direction on a circumference of said rotating baseplate, and springs for resiliently pushing an end of said chuck lever toward said wafer seat, wherein said chuck lever is extended above and under said rotating baseplate, an outer end of a chuck shaft slidably provided in a radial direction is engaged with a lower end of said chuck lever, an inner end of the chuck shaft is engaged with a chuck disk provided coaxially with said rotating baseplate, the chuck shaft is displaced in the radial direction by rotation of the chuck disk, and said chuck lever is rotated, wherein said peripheral edge of the wafer received on said wafer seat is pinched by said wafer seat and said chuck lever.