Patent ID: 6540127
Filing Date: 2003-04-01
Classification: H01L,H05K

Abstract:
An apparatus for mounting particles on a substrate having an array of tacky and non-tacky areas thereon, comprising:a) a first and a second electrode plate oriented in a horizontal plane, the first electrode plate spaced from the second electrode plate, positioned below the second electrode plate, and having a conductive surface facing the second electrode plate, the first electrode plate to hold a plurality of particles; b) a substrate support for holding the substrate in a horizontal plane between the first and second electrode plates and spaced from the first electrode plate with the tacky areas facing the first electrode; c) a source of DC potential connected to at least one of the first and second electrodes to establish a polarity on the first electrode plate to charge particles thereon and cause them to be propelled from the first electrode toward the second electrode, against the force of gravity, and be propelled against the mounting surface so the particles become adhered to the tacky areas to thereby populate the tacky areas with particles; and d) a switch connected to the source of DC potential to change the polarity established on the first electrode plate to propel particles from the non-tacky areas of the substrate into contact with the surface of the first electrode, discharge them, recharge them and cause them to be propelled from the first electrode toward the second electrode, against the force of gravity, and be propelled against the substrate so the particles become adhered to the tacky areas to thereby further populate the tacky areas with particles.