Patent ID: 7614541

Claim:
A method for placing balls having conductivity in a predetermined pattern onto one surface of a base unit, the method comprising: a first step for positioning an arrangement member having one surface, another surface and positioning openings in a manner that the another surface of the arrangement member is opposite to the one surface of the base unit, wherein the another surface of the arrangement member is opposite to the one surface of the arrangement member, and the positioning openings are arranged corresponding to a pattern such that the openings are through from the one surface to the another surface of the arrangement member for allowing the balls to insert therein; and a second step for horizontally moving a transfer device with respect to the one surface of the arrangement member and then placing the balls on the one surface of the base unit through the positioning openings, wherein the transfer device has two or more flexible line members of which core axes are substantially aligned, wherein each of the flexible line members is held by a pair of holding members at two ends of each of the flexible line members, and an abdomen, which is a portion of each of the flexible line members in between the two ends, is used for positioning the balls supplied to the one surface of the arrangement member.