Patent ID: 8302838
Filing Date: 2012-11-06
Classification: H01L

Abstract:
1. A micro-bump forming apparatus in which solder balls are loaded into openings of a film attached on a substrate, and heated to form solder bumps, the apparatus comprising: a film attachment mechanism that attaches the film on a surface of the substrate; exposure and developing mechanisms that provide the openings in the film on electrodes formed on the substrate; a solder ball loading mechanism that loads the solder balls into the openings, the solder ball loading mechanism including a solder ball loading head, and a sensor for checking a loading state; a flux printing mechanism that prints flux through the openings loaded with the solder balls; a reflow part that heats the solder balls to form the solder bumps; a film detachment mechanism that detaches the film from the surface of the substrate; and a controller that controls operations of the respective mechanisms; wherein the solder ball loading mechanism further includes: a loading table, a substrate mounting portion for mounting the substrate to be printed, the substrate mounting portion having a surface formed in a raised manner relative to that of the loading table, and a mask for covering the surfaces of the loading table and the substrate mounting portion, the solder ball loading head includes a dispersing squeegee, and the dispersing squeegee moves while being pressed on surfaces of the mask and the film attached on the surface of the substrate with a predetermined pressing force to thereby load the solder balls into the openings of the film, after the loading head loads the solder balls into the openings of the film, the controller of the solder ball loading mechanism allows the sensor to check the loading state of the solder balls, and the mask includes: a plurality of openings between the surfaces of the loading table and the substrate mounting portion, a feed pipe for feeding positive pressure, the feed pipe being connected to the plurality of openings, and, after the loading of the solder balls into the openings of film, the controller feeds positive pressure into the feed pipe to allow the solder balls remaining on the periphery of the substrate to move on the mask.