Patent ID: 7186926

Claim:
A surface mounting structure for a surface mounting electronic component, comprising: an electronic component having on a marginal portion thereof a plurality of electrodes, each of which is formed so as to cover at least an under surface, both side faces and an end face of the electronic component; a circuit board having a set of lands, on which the electrodes of the electronic component are joined by soldering, each land corresponding to one of the electrodes and having a restricting portion, which restricts movement of the electronic component at the time of solder melting during surface mounting, and also having a protrusion so as to correspond to each of the side faces of the corresponding electrode; and a solder fillet having a front fillet formed in a position corresponding to the end face of the electrode and a side fillet formed on each protrusion of the land, a portion of the land which corresponds to the front fillet having substantially the same width as the electronic component, the restricting portion being formed between the portion of the land which corresponds to the front fillet and the corresponding protrusion, the side fillet being separately formed from the front fillet, the protrusion of the land being formed so as to protrude from an inside end of the corresponding electrode toward an opposed land of the set of lands in a direction along the side face of the corresponding electrode, whereby the side fillet is formed so as to cover both corners on the middle side of the electronic component in an area between the under surface of the corresponding electrode and the corresponding land.