JPS593570Y2 - Chip type solid electrolytic capacitor - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a chip-type solid electrolytic capacitor, and more particularly to the structure of an extraction electrode terminal of a chip-type solid electrolytic capacitor.

Conventionally, resin-clad chip capacitors have anode and cathode terminal portions 10 and 11, which are formed by bending and bending a thin metal plate stepwise, as shown in FIG. The structure was such that they were joined by welding, soldering, etc., and then the entire body was covered with an exterior resin 14 such as epoxy resin.

In general, this type of chip-type capacitor requires a certain amount of wall thickness for the exterior resin due to its structural durability, and in the case of a transfer mold exterior, the thickness is 0.5 mm due to the flowability of the resin.
A greater wall thickness is required.

Further, if there is not enough margin for the assembly position accuracy of the capacitor element 12, anode terminal 10, and cathode terminal 11, external defects such as element exposure and pinholes will occur, and stability over time will deteriorate.

From the above, considering the wall thickness, gaps, etc., it is currently impossible to miniaturize the structure.

In addition, in terms of electrical characteristics, the anode terminal and the anode lead wire 13 of the capacitor element are joined by welding, which causes welding distortion, etc., and deteriorates the parallelism accuracy with the cathode terminal. When clamped to the mold,
A problem arises in that mechanical stress is applied to the joint between the capacitor element and the cathode terminal, resulting in an incomplete joint.

Furthermore, the molding pressure applied during transfer molding is applied to the capacitor element and the joint portion, resulting in a disadvantage that the electrical characteristics after packaging are deteriorated.

An object of the present invention is to provide a chip-type solid electrolytic capacitor that has a structure with high volumetric efficiency that eliminates all of the above-mentioned drawbacks and is suitable for mass production.

That is, in the present invention, a cap-shaped anode terminal having a notch extending from the negative side to the bottom is fitted into the part of the solid electrolytic capacitor element where the anode wire is provided.
The present invention also provides a chip-type solid electrolytic capacitor characterized in that the terminal end of the notch at the bottom and the anode wire are electrically connected.

Next, one embodiment of the present invention will be described using FIGS. 2 to 5.

FIG. 2 is a perspective view of a chip-type electronic component in a completed state according to the present invention, and FIGS. 3 and 4 respectively show perspective views of a cap-shaped cathode terminal and an anode terminal used in the present invention. Thin metal plates such as nickel silver, brass, and nickel are pressed and drawn, and then solder plated, gold plated,
A cap-shaped cathode terminal 2 is formed by surface treatment such as silver plating.

On the other hand, a notch 1a extending from the side to approximately the center of the bottom is formed in the cap-shaped product, and a bent protrusion 1b protruding outward is formed at the final part of the notch in the bottom portion 18. Set it as terminal 1.

Next, as shown in FIG. 5, a cap-shaped cathode terminal 2 is bonded to the capacitor element 3, which is formed by batch-assembling and bonded to a band-shaped metal plate 5 at equal intervals, using a conductive adhesive or solder. The exposed portion of the capacitor element 3 is coated with a liquid epoxy resin layer 6 or the like, and the surface is covered by a taping method or the like.

Thereafter, the anode lead wire 4 of the capacitor element is passed through the notch 1a of the cap-shaped anode terminal 1 while being attached to the band-shaped metal plate 5 at equal intervals, and the anode lead wire 4 and the bent protrusion 1b are covered. Then, the gap between the anode terminal and the capacitor element 1 is sealed and reinforced by injecting liquid epoxy resin from the notch 1a.

After that, a plurality of chip-type capacitors attached to the strip-shaped metal plate 5 at equal intervals are simultaneously cut from the bent protrusion of the lead wire 4 of the capacitor element 3 to obtain a chip-type capacitor according to the present invention. .

According to the present invention, the anode terminal 1 and the cathode terminal 2 are thin metal plates in the shape of caps, and have a structure in which they are directly connected to the capacitor element 3, resulting in high volumetric efficiency and the ability to mount such a chip-type capacitor on a circuit board. It can be mounted automatically, quickly and reliably, even on highly integrated circuit boards.

Furthermore, in manufacturing, since a notch is provided in the anode terminal, it is possible to simultaneously join multiple capacitor elements 3 attached to the strip-shaped metal plate 5 at equal intervals without having to separate them. This has the remarkable effect that the manufacturing process is not only extremely simple, but also suitable for mass production.

Furthermore, the present invention can provide a chip type capacitor with high precision without requiring much skill in operation.

Furthermore, when mounted on a circuit board, it has the characteristic of not having directionality depending on the mounting space.

Furthermore, in terms of electrical characteristics, the chip type capacitor is uniform, stable, and highly reliable because it requires no assembly position precision and is not affected by external pressure.

It should be noted that the present invention is not limited to the above-mentioned embodiments; for example, the cathode terminal may be a solder coated on the cathode layer.

As described above, the chip type capacitor according to the present invention has high volumetric efficiency, is suitable for mass production, and is highly reliable, and has great industrial value.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view of a conventional resin-clad chip capacitor, Fig. 2 is a perspective view of a completed chip-type solid electrolytic capacitor according to the present invention, and Fig. 3 is a cap-shaped anode terminal used in the present invention. FIG. 4 is an enlarged perspective view of a cap-shaped cathode terminal used in the present invention, and FIG. 5 is a perspective view of a capacitor element joined to a strip-shaped metal plate at equal intervals. Reference numeral 10 in the figure: positive electrode part, 11...
・Cathode part, 12... Capacitor element, 13.
... Anode lead wire of the capacitor element, 14
......Exterior resin, 1...Positive electrode part, 1a
......Notch part of the anode part, 1b...Bending protrusion of the anode part, 1z...Bottom part of the anode part, 2... Cathode part, 3... Condenser element, 4... Anode lead wire of capacitor element, 5... Band-shaped metal plate, 6...
...Epoxy resin layer.

Claims (1)

[Scope of utility model registration request] A cap-shaped anode terminal having a notch from one side to the bottom is fitted into the part of the solid electrolytic capacitor element where the anode wire is present, and the anode wire and the anode terminal are electrically connected at the end of the notch at the bottom. A chip-type solid electrolytic capacitor that is characterized by being electrically connected.