Patent ID: 9741599
Date: 2017-08-22
CPC Classifications: G01R,H01L,Y10T

Claim:
1. A chuck comprising: (a) an upper conductive layer having a lower surface and an upper surface suitable to contact and support a device under test, wherein said upper surface of said upper conductive layer includes thereon a vacuum distribution for holding said device under test; (b) an upper insulating layer having an upper surface at least in partial face-to-face contact with said lower surface of said upper conductive layer, and a lower surface, wherein the upper insulating layer is horizontally distinct from the upper conductive layer, wherein said upper insulating layer includes at least one recess defined therein; and (c) a middle conductive layer having an upper surface at least in partial face-to-face contact with said lower surface of said upper insulating layer, and a lower surface, wherein the middle conductive layer is horizontally distinct from the upper insulating layer, wherein said recess is proximate an exterior peripheral surface of at least one of said upper conductive layer and said middle conductive layer, wherein said recess extends around a majority of a circumference of said upper insulating layer, and further wherein said recess is configured to absorb stresses in said upper insulating layer.