Patent ID: 8289388

Claim:
Method of determining virtual cutting lines on a substrate prior to its singulation, the substrate comprising first and second rows of alignment marks which are parallel to each other, a pair of alignment marks each from the first and second rows of alignment marks being configured for determining a position of the virtual cutting lines on the substrate, the method comprising the steps of: positioning the first row of alignment marks along a relative motion path of a first camera and positioning the second row of alignment marks along a relative motion path of a second camera; moving the substrate relative to the first and second cameras along the respective relative motion paths without stopping while the first and second cameras capture images of multiple pairs of alignment marks from the first and second rows of alignment marks during such motion; and thereafter determining the position of each virtual cutting line on the substrate from the images of each pair of alignment marks along the first and second rows of alignment marks relating to the virtual cutting line on the substrate, and storing the positions of the virtual cutting lines on the substrate in a storage device for use during singulation.