Patent ID: 8695497
Filing Date: 2014-04-15
Classification: H05K

Abstract:
1. A screen printing apparatus for printing an electronic parts joining paste on an upper printing area which is set on an upper surface of a substrate and on which an upper surface electrode is formed and a bottom surface printing area which is set on a bottom surface of a recess portion which is opened in the upper surface and on which a bottom surface electrode is formed as objects, comprising: an upstream side printing portion and a downstream side printing portion which are disposed in series along a direction in which a substrate is transferred for printing the paste on the substrate as an object sequentially in two stages and a substrate transfer portion for transferring the substrate from the upstream side printing portion to the downstream side printing portion; wherein the upstream side printing portion comprises a bottom surface printing mask which is provided to correspond to the bottom printing area and which has a fitting portion adapted to fit in the recess portion and a mask pattern formed in the fitting portion so as to correspond to the bottom surface electrode and a first closed-type squeegee mechanism which is configured to include a pair of facing sliding contact plates which extend downwards from a lower surface of a main body portion which stores the paste so as to approach each other to contract gradually a space defined therebetween as they extend downwards with the facing direction aligned with a squeegeeing direction and which supplies the paste into the fitting portion via a printing opening provided between the sliding contact plates by bringing the sliding contact plates into abutment with an upper surface of the bottom printing mask to cause them to slide in the squeegeeing direction while pressurizing the paste stored in the main body portion, the downstream side printing portion comprises an upper surface printing mask which is provided to correspond to the upper surface printing area and which has a mask pattern formed so as to correspond to the upper surface electrode and a second closed-type squeegee mechanism which is configured in a similar way to the first closed-type squeegee mechanism and which loads the paste into pattern holes provided in the upper surface printing mask via a printing opening provided between a pair of sliding contact plates by bringing the sliding contact plates into abutment with an upper surface of the upper surface printing mask to cause them to slide in the squeegeeing direction while pressurizing the paste stored in the main body portion, of the pair of sliding contact plates of the first closed-type squeegee mechanism, a sliding contact plate which is situated at a rear side in the squeegeeing direction in a squeegeeing operation intended for the bottom surface printing area as a printing object scoops out the paste remaining in a depressed portion on an upper surface side of the fitting portion for removal from the depressed portion, of the pair of sliding contact plates of the second closed-type squeegee mechanism, a sliding contact plate which is situated at a rear side in the squeegeeing direction in a squeegeeing operation intended for the upper surface printing area as a printing object scrapes off the paste adhering to an upper surface of the upper surface printing mask.