Patent ID: 7866364

Claim:
A fabrication tool to press a first device surface against a second device surface, to bond the first device surface with the second device surface, the fabrication tool comprising: a bonding piston to exert force on the first device surface to press the first device surface against the second device surface; and, a pressure plate situated between the bonding piston and the first device surface; and, a mechanism to ensure that the force exerted by the bonding piston on the first device surface via the pressure plate is initially exerted at one or more first locations on the first device surface and subsequently exerted at one or more second locations on the first device surface, wherein the mechanism comprises: a profiled insert situated between the pressure plate and the first device surface, the profiled insert fabricated from a compliant material so as to deform under a full force load; and, one or more pushing elements attached to springs within the pressure plate and movable within corresponding holes of the pressure plate, such that under the full force load the pushing elements at least partially recede into the corresponding holes of the pressure plate, and wherein second contact is made with the first device surface at the second locations thereof by the profiled insert so that the force is subsequently exerted at the second locations thereof.