Patent ID: 9558979
Date: 2017-01-31
CPC Classifications: H01L,Y10T

Claim:
1. An apparatus for cutting a wafer comprising: a wafer chuck configured to hold the wafer on a surface thereof, wherein the surface of the wafer chuck on which the wafer is held has a reflectivity equal to or greater than 40%; a light source configured to illuminate the surface of the wafer chuck through the wafer; an image capture device configured to form an image of the wafer based on light emitted by the light source and reflected by the surface of the wafer chuck; a processor configured to determine locations of cutting lines on the wafer based on the formed image; and a cutting assembly configured to cut the wafer along the cutting lines determined by the processor; wherein electrode patterns of a plurality of semiconductor devices disposed on a surface of the wafer impede passage of the reflected light through the wafer, and the image capture device forms the image of the wafer showing first regions of the wafer in which light emitted by the light source is reflected by the surface of the wafer chuck to the image capture device, and second regions of the wafer having electrode patterns therein in which light emitted by the light source is not reflected by the surface of the wafer chuck to the image capture device.