JP2553577B2 - Solid electrolytic capacitor - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solid electrolytic capacitor, and more specifically to a resin mold type solid electrolytic capacitor.

2. Description of the Related Art A conventional solid electrolytic capacitor of this type is constructed as shown in FIG. That is, a metal powder having a valve action such as tantalum is formed and sintered, a dielectric oxide film is formed by anodic oxidation, and a solid electrolyte layer such as manganese dioxide, a carbon layer, and a solder layer are sequentially formed to form a capacitor element. 1, and the external cathode lead wire 2 is electrically and mechanically connected to the capacitor element 1 by soldering or the like. On the other hand, the external anode lead wire 3 has an L-shape bent at a substantially right angle and is electrically and mechanically connected by welding or the like to the internal anode lead wire 4 which is previously drawn from the capacitor element 1 at the tip portion. Has been done. Further, the entire product is molded with a synthetic resin 5 to complete the product.

Problems to be Solved by the Invention In such a conventional solid electrolytic capacitor, when the capacitor is mounted on a printed circuit board, the circuit board surface and the capacitor body are soldered in a state of being in close contact with each other. In such a case, the heat of soldering is propagated through the external lead wire and adversely affects the internal capacitor element. In order to avoid this, a so-called standoff 6 is provided. Due to this standoff 6, even if the capacitor body and the printed circuit board surface are in close contact with each other, a space is generated between the printed circuit board surface and the external lead wire and the heat is not received during soldering. However, there is a problem that the capacitor cannot be miniaturized due to the standoff.

The present invention is intended to solve such a conventional problem, and a capacitor having a larger CV value (product of electrostatic capacity and working voltage) can be housed in the same external dimension to realize a substantial downsizing. To do.

Means for Solving Problems The technical means is to form a metal powder having a valve action.
Sintered and implanted anode lead wire, dielectric oxide film,
A capacitor element formed by sequentially forming a solid electrolyte layer, a carbon layer, a silver paint layer, and a solder layer is subjected to a first process that is bent substantially at a right angle to the external cathode lead wire, and a second element is formed in a direction opposite to the capacitor element. The outer leads and anode lead wires, which have been processed and further processed so as to be along the bottom surface of the standoff, are connected to each other to form a mold resin outer cover.

Effect According to the present invention as described above, a so-called dead space in the stand-off portion can be utilized, so that an electrolytic capacitor having a substantially large CV value can be provided.

Example Hereinafter, an example of the present invention will be described in detail with reference to the drawings. In FIG. 1, 11 is a capacitor element produced by a usual method, and 12 is the same external cathode lead wire as the conventional one. Reference numeral 13 is an external anode lead wire according to an embodiment of the present invention, which is subjected to the first processing in which it is bent substantially at a right angle at 13a. Further, at 13b, the second processing is performed in the direction opposite to the capacitor element, and at 13c, the third processing is performed along the bottom surface of the standoff 16. The thus bent outer anode lead wire 13 and the inner anode lead wire 14 were welded, and the entire body was molded with synthetic resin 15 to form a finished product.

Reference numeral 17 is a substantially enlarged portion of the capacitor element in the product of the present invention when designed with the same external dimensions as the conventional example.

EFFECTS OF THE INVENTION As described above, according to the present invention, it is possible to store a larger capacitor element in an electrolytic capacitor having the same external dimensions, and therefore, it is possible to substantially reduce the size.

[Brief description of drawings]

FIG. 1 is a sectional view of a solid electrolytic capacitor according to an embodiment of the present invention, and FIG. 2 is a sectional view of a conventional solid electrolytic capacitor. 11 …… Capacitor element, 12 …… Cathode lead wire, 13 …… Anode lead wire, 14 …… Internal anode lead wire, 15 …… Synthetic resin, 16 …… Standoff, 13a …… First processed part, 13b …
… Second processing part, 13c …… Third processing part.

Claims (1)

(57) [Claims] 1. A capacitor formed by molding and sintering a metal powder having a valve action, implanting an anode lead wire, and sequentially forming a dielectric oxide film, a solid electrolyte layer, a carbon layer, a silver paint layer, and a solder layer. The element has an external cathode lead wire that is bent substantially at a right angle for the first processing, a second processing is performed in a direction opposite to the capacitor element, and a third processing is performed so as to follow the bottom surface of the stand-off anode. Connect to the lead wire,
Solid electrolytic capacitor with molded resin exterior.