Screen printing device and screen printing method

1. A screen printing device for printing paste on a substrate via pattern holes by performing a reciprocating squeezing operation in which a squeegee unit reciprocatively slides in a squeezing direction in a state of abutting on an upper surface of a mask formed with the pattern holes, comprising:

a substrate underlaid bracket portion which receives and holds the substrate;

a squeegee moving mechanism which causes the squeegee unit to be moved upward or downward and moved reciprocatively in the squeezing direction, and

two paste deposition mechanisms which are disposed on outward path and returning path sides of the squeegee unit in the squeezing direction, reciprocatively movable in synchronization with the squeegee unit, and each of the two paste deposition mechanisms having a deposition member moving upward or downward with respect to the mask,

wherein the squeegee unit is a closed type squeegee mechanism which is configured so that a pair of sliding members opposed to each other in a downward-narrowed state extend downward from a lower surface side of a main body portion storing the paste so as to align a facing direction thereof with the squeezing direction, and compresses the paste stored in the main body portion and reciprocatively slides the pair of sliding members in the squeezing direction in a state of being abutted on the upper surface of the mask so that the paste is packed into the pattern holes via a printing opening provided between the pair of sliding members, and

wherein, in outward path and returning path operations for reciprocatively moving the squeegee unit in the squeezing direction, the paste supplied to an outside of the closed type squeegee mechanism on the upper surface of the mask is spread due to the deposition member by moving, in a traveling direction, the deposition member of one of the two paste deposition mechanisms positioned on a following side in the traveling direction, in a state close to the upper surface of the mask, thereby forming a paste film having a predetermined thickness.

2. The screen printing device according to claim 1 ,

wherein, in the outward path and returning path operations, the pair of sliding members positioned on a leading side in the traveling direction with regard to an outward path or a returning path, between the pair of sliding members, is moved in the squeezing direction before the packing of the paste into the pattern holes via the printing opening so that the paste supplied to the outside of the closed type squeegee mechanism on the upper surface of the mask is packed into the pattern holes.

3. A screen printing method for printing paste on a substrate via pattern holes by performing a reciprocating squeezing operation in which a squeegee unit reciprocatively slides in a squeezing direction in a state of abutting on an upper surface of a mask formed with the pattern holes, in which the squeegee unit is a closed type squeegee mechanism which is configured so that a pair of sliding members opposed to each other in a downward-narrowed state extend downward from a lower surface side of a main body portion storing the paste so as to align a facing direction thereof with the squeezing direction, and compresses the paste stored in the main body portion and reciprocatively slides the pair of sliding members in the squeezing direction in a state of being abutted on the upper surface of the mask so that the paste is packed into the pattern holes via a printing opening provided between the pair of sliding members, and further two paste deposition mechanisms, each of the deposition mechanisms is reciprocatively movable in synchronization with the squeegee unit and has a deposition member moving upward or downward with respect to the mask, are disposed on an outward path and returning path sides of the squeegee unit in the squeezing thereof, the method comprising:

a substrate positioning step which positions the substrate received and held by a substrate underlaid bracket portion, with respect to the mask;

a paste supplying step which supplies the paste to an outside of the closed type squeegee mechanism on the upper surface of the mask; and

a printing executing step which reciprocatively moves the squeeze unit on the upper surface of the mask,

wherein, in outward path and returning path operations of the printing executing step for reciprocatively moving the squeegee unit in the squeezing direction, the paste supplied to the outside of the closed type squeegee mechanism on the upper surface of the mask is spread due to the deposition member by moving, in a traveling direction, the deposition member of one of the paste deposition mechanisms positioned on a following side in the traveling direction, in a state close to the upper surface of the mask, thereby forming a paste film having a predetermined thickness.

4. The screen printing method according to claim 3 , wherein, in the outward path and returning path operations, one of the pair of sliding members positioned on a leading side in the traveling direction with regard to an outward path or a returning path, between the pair of sliding members, is moved in the squeezing direction before the packing of the paste into the pattern holes via the printing opening so that the paste supplied to the outside of the closed type squeegee mechanism on the upper surface of the mask is packed into the pattern holes.