Patent ID: 9237686
Filing Date: 2016-01-12
CPC Classification: H01L,H05K,Y02P

Claim Text:
1. A method for producing a component mounting board in which an electronic component is mounted on a wiring board, the wiring board comprising an insulated board, a wiring layer formed on a surface of the insulated board, and a resist covering the wiring layer, and the resist having an opening exposing a joint face which is part of a surface of the wiring layer and to which a terminal of the electronic component is to be electrically joined, the method comprising the steps of: (a) applying a solder paste including solder and thermosetting resin, onto the joint face; (b) placing the electronic component on the wiring board such that the terminal of the electronic component covers the opening entirely and comes in contact with the solder paste applied onto the joint face; and (c) after execution of the step (b), heating the solder paste applied onto the joint face, thereby to melt the solder and soften the thermosetting resin and then to cure the thermosetting resin, wherein: in the step (c), as a result of melting of the solder and softening of the thermosetting resin, the electronic component is brought into proximity with a surface of the resist, and the solder and the thermosetting resin are separated from each other, allowing the solder to gather in a first space within the opening closed with the wiring layer and the electronic component, while allowing the thermosetting resin to gather in a second space formed between a top side of the resist and a lateral side of the electronic component, and communication between the first and the second spaces is blocked by the electronic component after a cooling process subsequent to step (c).