Patent ID: 8714084
Filing Date: 2014-05-06
Classification: B05C,B41F,H05K

Abstract:
1. A screen printing apparatus which is to be connected to an upstream side of an electronic component mounting apparatus for mounting an electronic component onto a circuit board, to constitute an electronic component mounting line, and which prints a paste for bonding an electronic component on upper-surface printing areas which are set on an upper face of the circuit board, and in which upper-surface electrodes are formed, and bottom-surface printing areas which are set on bottom surfaces of recesses opening in the upper surface, and in which bottom-surface electrodes are formed, the screen printing apparatus comprising: an upstream screen printing portion and downstream screen printing portion which are placed in series along a circuit board transporting direction in the electronic component mounting line, and which sequentially print the paste in two steps on the circuit board; and a circuit board transferring portion which transfers the circuit board from the upstream screen printing portion to the downstream screen printing portion, wherein the upstream screen printing portion includes: a bottom-surface printing mask having fitting portions which are disposed in correspondence with the bottom-surface printing areas, and which are to be fitted into the recesses, and pattern holes which are formed in the fitting portions in correspondence with the bottom-surface electrodes; and a closed squeegee mechanism abutting against and sliding over an upper surface of the bottom-surface printing mask to pressurize the paste that is retained inside, to supply the paste into the fitting portions, and wherein the downstream screen printing portion includes: an upper-surface printing mask having pattern holes which are disposed in correspondence with the upper-surface printing areas, and which are formed in correspondence with the upper-surface electrodes; and a squeegee abutting against and sliding over an upper surface of the upper-surface printing mask to fill the paste into the pattern holes.