Patent ID: 9266192
Filing Date: 2016-02-23
CPC Classification: B23K,Y10T

Claim Text:
1. A method of processing a workpiece having a front side and a back side, the method comprising: arranging the front side of the workpiece such that a portion of the front side of the workpiece is disposed within a processing region of a processing tool; within the processing region, processing from the front side of the workpiece with the processing tool to remove material within the portion of the workpiece to form a workpiece feature that extends fully or partially through the workpiece; after forming the workpiece feature, directing detection light into the processing region and onto the portion of the front side of the workpiece, wherein the detection light has a wavelength to which the workpiece is at least partially opaque; detecting detection light transmitted through the processing region to the back side of the workpiece; comparing sample image data of the workpiece feature to reference image data of a reference feature to determine a processing state of the workpiece feature based on amount of coincidence between the sample image data of the workpiece feature and the reference image data of the reference feature, wherein the processing state of the workpiece feature is one of complete or incomplete with respect to processing by the processing tool; and within the processing region, further processing the workpiece feature from the front side of the workpiece with the processing tool when comparison of the sample image data and the reference image data indicates that the processing state of the workpiece feature is incomplete.