| 摘要 |
PROBLEM TO BE SOLVED: To keep solder balls in a solder ball tray proper in amount always and to enable a pickup head to always carry out a solder ball suction operation stably. SOLUTION: A solder ball tray 2 is vibrated by a vibration generator 6, solder balls 1 (amount of solder balls is so set as to cover 50% or so of the area of the bottom of the tray 2) residing in the solder ball tray 2 are nearly uniformly scattered on the bottom, the density of solder balls 1 residing in a prescribed region in the solder ball tray 2 is detected in this state by a solder ball sensor 7, the amount of solder balls in the solder ball tray 2 is estimated, and a solder ball replenishing command signal is outputted to a solder ball replenishing mechanism 8 when it is judged that the solder balls are required to be replenished.
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