Patent ID: 6615715
Filing Date: 2003-09-09
Classification: B41F,B41P,H05K

Abstract:
A screen printing apparatus to print a paste on a substrate, comprising:(a) a positioning section which holds said substrate; (b) a mask plate having pattern holes, said mask plate being disposed above said substrate; (c) a squeegee head to store the paste and supply the paste onto said mask plate; and (d) a pressure mechanism to pressurize the paste in said squeegee head, wherein said squeegee head includes a paste storage container to store the paste and a printing space to accommodate the paste supplied from said paste storage container; said paste storage container has a volume-variable container which varies in volume according to an operation of said pressure mechanism; said volume-variable container has a plurality of through-holes, a push-out plate which forms the bottom of said volume-variable container, and a free-to-move projecting portion, said volume-variable container is reduced in volume according to the operation of said pressure mechanism, and the paste filled in said volume-variable container is pushed out into said printing space through said through-holes, and thereby, the paste is supplied onto said mask plate, said plurality of through-holes are formed at said push-out plate, the paste is pushed out into said printing space through said plurality of through-holes, and said projecting portion has a plurality of projections which may fit into said plurality of through-holes, and according to the operation of said pressure mechanism, said projecting portion moves to push out the paste in said volume-variable container into said printing space through said plurality of through-holes, and then said projections fit into said plurality of through-holes to push out the paste remaining in said plurality of through-holes into said printing space, wherein said volume-variable container further includes a side wall member that forms the side wall of said volume-variable container, said side wall member being flexible, and said projecting portion moves downward while compressing said side wall member.