Patent ID: 6983872

Claim:
Apparatus for aligning a substrate comprising: a ball pick head for picking up a plurality of solder balls in a ball pick-up process and depositing them onto the substrate; a vision system adapted to view the substrate and to obtain positional information in accordance with a position of the substrate; a carrier including a flux transfer head for collecting and depositing flux onto the substrate, the vision system being mounted to the carrier such that operation of the vision system is decoupled from movement of the ball pick head; and drivers responsive to said positional information obtained by the vision system to align at least the substrate and the ball pick head for depositing the solder balls onto the substrate; wherein the vision system comprises a first camera that is movable along a linear guide for positioning the first camera with respect to the carrier to view positional indicia on a surface of the substrate and further comprising a second camera movable along a linear guide substantially independently of the first camera, such that the first and second cameras cooperate to view the positional indicia at different positions on the surface of the substrate.