Patent ID: 7800766

Claim:
An apparatus for adjusting placement of a substrate in a lithography system to place the substrate in a desired focal range of the lithography system, comprising: a height detection device, a substrate holder for receiving the substrate; at least one holder clamp for retaining the substrate in said substrate holder; at least one reflector patterned on a surface of the substrate for determining a height of said substrate surface wherein a height of said at least one reflector from said surface of the substrate is known; a calibration marker on said substrate holder to serve as a height reference; at least one spacer for placement under said at least one holder clamp to place said substrate surface in said acceptable focal plane range of said lithography system; wherein said known height of said at least one reflector is compared to a height of said calibration marker using said height detection device to determine if said substrate surface is within said acceptable focal range of said lithography tool and adjusting a position and a placement of said substrate within said substrate holder using said at least one spacer to place said substrate surface within said acceptable focal range.