| 摘要 |
PROBLEM TO BE SOLVED: To improve performances of paste filling and snap off, to make a contribution to enabling high-speed, high-yield and stable production of bump electrodes, to enable a user to simply use equipment and to attain stable printing properties, since the snap off begins gradually from the peripheral part of a metal mask and occurs lastly in the central part thereof, owing to the force of adhesion of the paste transferred by a large number of groups of openings to the metal mask, and this phenomenon causes printing faults such as nonuniformity in the thickness of a printed film and a lack in print, in regard to formation of the bump electrodes by a screen printing method. SOLUTION: The mask having a connective portion that connects together individual mask pieces corresponding to individual component patterns put on a board to be printed or to individual patterns occupying a prescribed areas, with a different thickness, a different material or a different spring constant from that of the mask pieces, and a snap-off adjusting means being capable of reproducing an optional snap-off curve in conformity to the conditions of connection, are provided for the equipment. COPYRIGHT: (C)2008,JPO&INPIT
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