Patent ID: 6321973
Filing Date: 2001-11-27
Classification: H01L

Abstract:
A bump-joining method for joining a plurality of bumps formed at an electronic component to electrode portions on a circuit board, said method comprising:with the plurality of bumps facing the electrode portions, performing a pressing operation to cause relative movement between all of the plurality of bumps together and the electrode portions together so that said plurality of bumps and said electrode portions move in a direction toward each other so as to compress the plurality of bumps so that contact-areas of the bumps to the electrode portions change to completed contact-areas at completion of the joining of the bumps to the electrode portions, wherein the completed contact-areas exceed initial contact-areas;generating initial relative vibration between the plurality of bumps and the electrode portions, without causing misregistration of the plurality of bumps and the electrode portions, before the plurality of bumps contact the electrode portions and until the contact-areas reach the initial contact-areas; andgenerating relative vibration, exceeding the initial relative vibration, between the plurality of bumps and the electrode portions, continuously from a time at which the contact-areas reach the initial contact-areas to a time at which the contact-areas reach the completed contact-areas, to thereby join the plurality of bumps to the electrode portions.