Patent ID: 6975407
Filing Date: 2005-12-13
Classification: G01B,G03F

Abstract:
1. A method of wafer height mapping using a wafer level sensor, comprising the steps of: determining edge positions of an exposure field on a wafer, the exposure field having two edges defining a width of the exposure field; aligning an array of measurement spots to the exposure field, wherein the array of measurement spots is centered within the exposure field; translating the array of measurement spots in a first direction towards a first of the two edges of the exposure field until the first edge is substantially flush with a first closest measurement spot that is closest to the first edge and the first measurement spot being within the exposure field; scanning and mapping the exposure field, generating a first mapped height data of the exposure field; translating the array of measurement spots in a second direction towards a second of the two edges of the exposure field until the second edge is substantially flush with a second closest measurement spot that is closest to the second edge and the second measurement spot being within the exposure field; and scanning and mapping the exposure field a second time, generating a second mapped height data for the exposure field.