Manufacturing method of surface mounting capacitor for enhancing weldability

Abstract

The invention discloses a manufacturing method of a surface mounting capacitor for enhancing weldability; laminated metal films are clamped together by adopting a special tooling, metal is sprayed on the side end surface of the laminated metal films, so as to lead the upper and lower ends of a metal spraying layer formed by spraying the metal on the side end surface of the laminated metal films to be respectively provided with an upward bulge and a downward bulge which is symmetrical with the upward bulge along the horizontal direction; a sunk part is arranged on the special tooling, the sunk depth of the sunk part is 0.07-0.13mm, the inner end of the sunk part is an inclined surface, the inclined surface and the sunk surface of the sunk part and the normal surface of the tooling are connected smoothly, the inclined surface of the sunk part and the normal surface of the tooling form an included angle with 30-50 degrees; by adopting the special tooling, the upper and lower end surfaces of the metal spraying layer at two ends of the laminated metal films are bulged, the welding contact area is increased, the welding reliability is ensured, and the probability of insufficient welding and tomb stone and the like of the surface mounting capacitor is greatly reduced.

Description

technical field [0001] The invention relates to a surface mount capacitor, in particular to a method for making a surface mount capacitor which can enhance its solderability. Background technique [0002] With the further development of electronic products towards miniaturization and miniaturization, various electronic components also require further miniaturization and miniaturization. Surface mount capacitors are among the electronic components that realize the production of modern small and ultra-small portable electronic products. The component surface of the surface mount capacitor is the soldering surface, so the component and wiring can be placed on both sides of the PCB board, saving the effective area; the use of surface mount capacitors not only saves the effective space, but also greatly reduces the volume of the whole machine , and the circuit is compact, the reliability is greatly increased, and the mean time between failures is doubled; the use of surface mount...

AI Technical Summary

Problems solved by technology

An existing surface mount capacitor is made of metal film, such as figure 1 As shown, during production, multilayer metal films 1' are stacked together, and the laminated metal films 1' are clamped together by common tooling 2', and then metal 3' is sprayed on the end faces of the laminated metal films 1' (such as figure 2 shown), after metal spraying, a gold spraying layer 31' is formed on the end face of the laminated metal film 1' (such as image 3 As shown), since the side of the ordinary tooling 2' facing the clamping laminated metal film 1' is a plane, especially the edge 21' of this surface is also a plane, therefore, the upper and lower end surfaces 311' of the gold-sprayed layer 31' are also When installing a surface-mounted capacitor, the gold-sprayed layer 31' at both ends of the laminated metal film 1' is soldered on the circuit board as a solder leg. The surface-mounted capacitor with this structure is likely to cause virtual soldering.

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