Patent ID: 6916731

Claim:
A ball transferring method comprising the steps of: sucking balls onto a carrier board so as to arrange temporarily said balls in a ball arrangement region of said carrier board, wherein said balls have a diameter of less than 300 μm; applying gas blow to said ball arrangement region so as to remove excess balls other than balls that have been exactly sucked onto said ball arrangement region; wherein said gas blow has a velocity of v or less, wherein gas blow velocity v is calculated by a formula: v = (2 Q·F r ·r a /(ρ S b ·( r b 2 −r a 2 ) 1/2 )) 1/2 wherein Q is a coefficient equal to 0.8 or less; F r is suction force sucking the balls onto the carrier board; r a is radius of suction holes; r b is radius of balls; ρ represents gas density of the applied gas blow; S b is vertical sectional area of a ball portion protruding beyond a ball arrangement plane; transferring and bonding the remaining balls onto an objective substance with positional adjustment being made.