Patent ID: 7644856
Filing Date: 2010-01-12
Classification: B23K,H01L,H05K

Abstract:
1. A solder ball mounting method comprising the steps of: providing a flux on electrodes formed on a substrate; arranging a first solder ball mounting mask on the substrate, the first solder ball mounting mask having ball feeding openings in positions opposing the electrodes; arranging a second solder ball mounting mask on the first solder ball mounting mask, the second solder ball mounting mask having ball feeding openings in positions opposing the electrodes, the ball feeding openings of the second solder ball mounting mask having a diameter larger than a diameter of the ball feeding openings of the first solder ball mounting mask; feeding solder balls into the ball feeding openings of the second solder ball mounting mask and the ball feeding openings of the first solder ball mounting mask respectively by moving the second solder ball mounting mask with respect to the first solder ball mounting mask in a surface direction of the substrate; restricting movement of the second solder ball mounting mask such that when the second solder ball mounting mask is moved in one direction the second solder ball mounting mask stops when a left edge of ball feeding openings of the second solder ball mounting mask is in alignment with a left edge of the ball feeding openings of the first solder ball mounting mask and when the second solder ball mounting mask is moved in an opposite direction the second solder ball mounting mask stops when a right edge of ball feeding openings of the second solder ball mounting mask is in alignment with a right edge of the ball feeding openings of the first solder ball mounting mask; removing the first and second solder ball mounting masks from the substrate; and joining the solder balls to the electrodes.