Patent ID: 9375913
Filing Date: 2016-06-28
CPC Classification: B41F,H05K

Claim Text:
1. A screen printer which performs printing by moving solder which is placed on a screen using a squeegee, the screen printer comprising: a head, on which the squeegee is mounted; a parallel movement device that causes the head and the screen to move relatively in a direction parallel to the screen; a perpendicular movement device that causes the head and the screen to move relatively in a direction perpendicular to the screen; position detection device that detects a relative position between the squeegee and the screen; optical detection device which is provided such that an optical axis position is capable of moving relative to the screen due to the parallel movement device, and which detects the screen and the solder at the optical axis position in distinction from each other; printing completion time control device configured to, when printing is completed, control the perpendicular movement device such that the squeegee and the screen move relatively in a direction perpendicular to the screen to a position at which the squeegee is at least separated from a state of being in contact with one end side of the solder in a printing direction, and, after the controlling is performed, controlling the parallel movement device such that the head and the screen move relatively in a direction parallel to the screen until at least another end side of the solder in the printing direction is detected by the optical detection device; and solder amount estimation device configured to estimate an amount of solder on the screen based on the relative position between the squeegee and the screen which is detected by the position detection device when the printing is completed, and the relative position between the squeegee and the screen which is detected by the position detection device when the other end of the solder in the printing direction is detected by the optical detection device.