Patent ID: 8941968
Filing Date: 2015-01-27
Classification: H01L

Abstract:
1. An electrostatic clamp, comprising: a clamping plate having a clamping surface, wherein a portion of the clamping surface is configured to contact both a first workpiece of a first size and second workpiece of a second size, wherein the second size is larger than the first size; one or more electrodes associated with the clamping plate, wherein a voltage applied to the one or more electrodes is operable to selectively electrostatically attract the first workpiece and second workpiece to said portion of the clamping surface; and one or more auxiliary clamping members respectively associated with a first clamping set and a second clamping set, wherein the first clamping set is configured to selectively mechanically clamp the first workpiece to the clamping surface, and wherein the second clamping set is configured to selectively mechanically clamp the second workpiece to the clamping surface, wherein only one of the first clamping set or second clamping set mechanically clamps the respective first workpiece or second workpiece to the clamping surface at a time.