JPH03205814A - Electronic parts for surface mounting - Google Patents

Abstract

PURPOSE:To obtain an object high in soldering strength and capable of soldering with small heat capacity by providing a cut or a hole at the plate-shaped terminal for soldering. CONSTITUTION:This has at least one plate-shaped soldering terminal 1a or 1b or 3a or 3b, and the end or side of the terminal 1a or 1b or 3a or 3b has at least one cut. Alternatively, this may ber provided with at least one plate- shaped soldering terminal 2a or 2b, and the end or the side of the terminal 2a or 2b has at least one hole. Further alternatively it may be provided with at least one plate-shaped soldering terminal and the end or the side of the terminal has at least one cut and at least one hole. Hereby, bubbles arising between the soldering terminal face and the land face of a printed wiring board are relaxed, and also the circumference of the end of the plate-shaped terminal becomes long, so the tearing strength of soldering improves.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a surface mount electronic component, and more particularly to a surface mount electronic component having a flat soldering terminal.

[Conventional technology]

Conventionally, the terminal shape of this type of surface-mounted electronic component has been flat as shown in FIG. By soldering this to soldering lands marked on the printed circuit board pattern, the component was connected to the circuit and fixed on the board.

[Problem to be solved by the invention]

Because the terminals of the conventional surface-mount electronic components mentioned above are flat, black bubbles tend to form between the terminal surface and the land surface of the printed circuit board, making it difficult to obtain sufficient peel strength for soldering. There is. Particularly, when the weight of the component is large compared to the total area of the soldering terminal, there is a drawback that the drop resistance is insufficient.

Furthermore, flat terminals require a large heat capacity when soldering, and have the disadvantage that the time required for soldering is longer than that for other components. Note that this becomes more noticeable as the terminal area is increased in order to increase the soldering strength.

The object of the present invention is to provide a flat terminal for soldering with a notch,
Alternatively, by providing a hole, the soldering strength is increased.
Another object of the present invention is to provide a surface-mounted electronic component that can be soldered with a small heat capacity.

[Means to solve the problem]

The surface mount electronic component of the first invention has at least one flat soldering terminal, and has at least one notch on the end or side surface of the terminal.

The surface mount electronic component of the second invention has at least one flat soldering terminal and at least one hole on the end or side surface of the terminal.

A surface mount electronic component according to a third aspect of the invention has at least one flat soldering terminal, and has at least one notch and at least one hole on the end or side surface of the terminal.

〔Example〕

Figure 1 (A) shows a flat soldering terminal with one notch, Figure 1 (B) has one hole, and Figure 1 (C) has two notches. 1 is a perspective view of an embodiment. When soldering a surface mount electronic component in which the soldering terminals 1a and 1b have notches as shown in FIG. 1, the solder penetrates into the notches and is soldered. As the peripheral surface becomes longer, the soldering strength increases. Also, since the area of the soldering terminal is reduced by the amount of the notch, soldering can be performed with a small heat capacity.The soldering terminal is shown in Figure 1 (B).
, the same results as in FIG. 1(A) can be obtained even with the shape shown in FIG. 1(C).

Furthermore, similar results can be obtained by providing notches and holes on the end or side surface of the flat soldering terminal.

〔Effect of the invention〕

As explained above, the surface mount electronic component of the present invention is
By providing a notch or a hole in a flat terminal for soldering, the soldering strength is increased and the drop resistance against components with a large weight is increased. In addition, by providing a notch or hole in the soldering terminal, air bubbles that occur between the soldering terminal surface and the land surface of the printed circuit board are reduced, and the circumference of the end surface of the flat terminal becomes longer, making it easier to solder. The peel strength is also improved, and the reliability of the device can be improved. In addition, since soldering can be performed with a small heat capacity, it is possible to solder the parts one by one using a laser beam, for example.
This has the effect of shortening the time required for soldering.

[Brief explanation of drawings]

1(A) shows a flat soldering terminal with one notch, FIG. 1(B) has one hole, and FIG. 1(C) shows an embodiment of the present invention with two notches. An example perspective view, FIG. 2 is a perspective view of a conventional surface mount component. la, lb...Soldering terminal with one notch, 2a, 2b...Soldering terminal with one hole, 3
a, 3b...Soldering terminal with two notches,
4a, 4b... Conventional soldering terminals.

Claims (3)

[Claims] 1. An electronic component for surface mounting, comprising at least one flat soldering terminal and at least one notch on an end or side surface of the terminal. 2. An electronic component for surface mounting, comprising at least one flat soldering terminal, and at least one hole formed in the end or side surface of the terminal. 3. 1. An electronic component for surface mounting, comprising at least one flat soldering terminal, and at least one notch and at least one hole formed in the end or side surface of the terminal.