PURPOSE: To finely control the coating amt. of reflow solder by making the thickness of a screen mask thin at the opening parts for mounting various electronic parts of the screen mask and providing a large number of small through-holes to each of the opening parts.
CONSTITUTION: A screen mask 100 is generally formed by using a metal film with a thickness of about 200μm. Opening parts 410-a, 410b, 201, 202 for lands mounting electronic parts such as an IC, a resistor, a condenser or a connector are provided to the metal film At a land 101 where the coating amt. of reflow solder is especially desired to be controlled, the thickness of 200μm is reduced to about 70μm. Further, opening parts 102-a-102-n are provided to each of the opening parts for the lands. By this constitution, the coating amt. of the reflow solder can be finely controlled.
SOYA TAKASHI
NAKAHARA TAKASHI
TAKAZAWA HIROSHI
NASHIDA YASUMASA
NANBU TOMOKO
SUZUKI EISHIN
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