To provide a metal masking plate for screen printing which hardly generates an angular protrusion even when the periphery of an electronic component (120) is sealed with resin by screen printing.
The metal masking plate has a through hole (2) which forms a resin inflow space (4) between the periphery of the electronic component (120) and the metal masking plate, the through hole (2) being constituted of a lower small-diameter hole (2B) and an upper large-diameter hole (2A) communicating with a spot above the lower small-diameter hole (2B), and a stepped part (6) is formed inside the through hole (2). When the metal masking plate (1) for screen plating is removed, only the inside surface of the lower small-diameter hole (2B) comes into contact with a sealing resin (3) sticking to the electronic component (120). Therefore, the shear area is small and the sealing resin (3) is cut apart before the angular protrusion could be generated.
YAMAGUCHI YOSHIAKI
SAITO ISAMU
NAKAYAMA NAOMI
