SCREEN PRINTER AND METHOD FOR DETECTING AMOUNT OF RESIDUAL PASTE

摘要

A light receiving section 27b receives a measurement beam, which is cast from a light projection section 27a and partially blocked by cream solder 19 scraped up by a squeegee 16, whereby a sensor 27 measures a one-dimensional size of a predetermined region of a cross sectional profile of the cream solder 19 as a cross sectional paste length and takes the cross sectional paste length as an index for an amount of residual cream solder 19. The amount of residual cream solder 19 can be numerically grasped at all times, so that versatility and accuracy in detecting the amount of residual cream solder 19 can be assured.

主权项

1. A screen printer that brings a substrate into contact with a screen mask with a pattern hole and prints the substrate with paste through the pattern hole by squeegeeing operation for sliding a squeegee over the screen mask supplied with the paste, the printer comprising:
a substrate positioning section that holds and positions the substrate with respect to the screen mask; a screen printing mechanism that vertically and horizontally moves a squeegee head with the squeegee so as to perform the squeegeeing operation; and an amount-of-residual-paste detection section detecting an amount of paste remaining on the screen mask; wherein the amount-of-residual-paste detection section has a sensor that is integrally moved along with the squeegee head, that is made up of a light projection section and a light receiving section, which are disposed opposite each other, and that can measure one dimensional size of a measurement target, and an amount-of-residual-paste calculation section that estimates and calculates an amount of residual paste from a measurement result of the sensor; the light receiving section receives a measurement beam, which is cast from the light projection section and partially blocked by the paste scraped up by the squeegee, whereby the sensor measures a one-dimensional size of a predetermined region of a cross sectional profile of the paste as a cross sectional paste length; and the amount-of-residual-paste calculation section takes the cross sectional paste length as an index for the amount of residual paste.