Patent ID: 8001683
Filing Date: 2011-08-23
Classification: B23K,H01L,H05K,Y10T

Abstract:
1. A solder ball loading method for loading solder balls that turn to be solder bumps on pads of a printed wiring board using a ball arrangement mask having a plurality of openings corresponding to the pads in the printed wiring board, the solder ball loading method comprising: locating a cylinder member above the ball arrangement mask such that an opening portion of the cylinder member is facing the ball arrangement mask and provided a predetermined distance above the ball arrangement mask; supplying inactive gas or reducing gas at least to an area outside of and surrounding the opening portion in the cylinder member, and sucking air from an interior of the cylinder member to produce a negative pressure within the cylinder member such that the inactive gas or reducing gas around the cylinder memberis sucked into the cylinder member to cause gathering of solder balls on the ball arrangement mast just below a cylinder member; and dropping the solder balls gathered just below the cylinder member onto the pads on the printed wiring board through the opening in the ball arrangement mask by moving the cylinder member or the ball arrangement mask and the printed wiring board.