JPH05291079A - Chip type solid electrolytic capacitor - Google Patents

Abstract

PURPOSE:To enable a chip-type solid electrolytic capacitor to be discriminated in polarity even from its mounting side where an anode and a cathode lead terminal are provided so as to eliminate the wrong application of voltage in polarity and to be mounted especially through a bulk system as a mounting method. CONSTITUTION:An anode lead terminal 1 and a cathode lead terminal 2 are connected to a solid electrolytic capacitor element 5 with resistance welding and conductive adhesive agent 6, and then the capacitor 5 is sealed up with a molding resin 7. At this point, the shape of a molding die correspondent to a standoff part 3 of a mounting face is so set that the end of the standoff part 3 on one lead terminal side is formed arc-shaped and the other end of the standoff part 3 on the other lead terminal side is formed square, whereby the ends of the standoff part 3 are a symmetrical in shape. By this setup, as the ends of the standoff part 3 are unsymmetrical in shape, the polarity of a solid-state electrolytic capacitor of this design can be easily recognized from its mounting face side, then a voltage is rightly applied in polarity to the capacitor without fail, and the capacitor earn be mounted through a bulk system as a mounting method.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chip type solid electrolytic capacitor, and more particularly to the shape of a standoff portion.

[0002]

2. Description of the Related Art A conventional chip type solid electrolytic capacitor is
As shown in FIG. 3, a standoff portion 3 corresponding to the thickness of the lead terminals is provided between the anode lead terminal 1 and the cathode lead terminal 2 arranged on the mounting surface.

Generally, the standoff end has the same shape on both sides of the bipolar terminals.

[0004]

In this conventional chip-type solid electrolytic capacitor, the stand-off portion 3 has the same shape on the anode lead terminal 1 side and the cathode lead terminal 2 side. The polarity could not be recognized when viewed from the side of the mounting surface equipped with.

Therefore, in order to discriminate the polarity, the surface portion, which is the opposite surface of the standoff portion, is marked to indicate the polarity. However, if the polarity display is reversed or not marked in the marking process of the polarity display, the true polarity that matches the contents of the product cannot be discriminated, and therefore the electrical mounting side is There was a drawback that a reverse voltage was applied incorrectly when checking the characteristics. In addition, at the time of mounting, it is necessary to align the polar directions of the sticks and the embossed tape, which makes it impossible to perform bulk mounting, and there is a drawback that the cost required for mounting is high.

An object of the present invention is to determine the polarity from the mounting surface side where the anode lead terminal and the cathode lead terminal are arranged,
An object of the present invention is to provide a chip-type solid electrolytic capacitor which can eliminate mistakes in the voltage application direction and can also use a bulk method as a mounting method.

[0007]

In the chip type solid electrolytic capacitor of the present invention, the end shape of the standoff portion provided at the intermediate portion of the mounting surface on which the anode lead terminal and the cathode lead terminal are arranged is the anode side. It has an asymmetric structure in which the cathode side and the cathode side are different.

[0008]

The present invention will be described below with reference to the drawings. FIG. 1 is a vertical sectional view and a plan view seen from a mounting surface of an embodiment of the present invention. As shown in the figure, the solid electrolytic capacitor element 5, the anode lead terminal 1 and the cathode lead terminal 2 are connected by resistance welding and a conductive adhesive 6, respectively, and then molded with a molding resin 7. At this time, as for the shape of the standoff portion 3 on the mounting surface, the standoff end on the anode side was arcuate and the standoff end on the cathode side was square.

By the above processing, the length is 2.0 mm and the width is 1.
A chip type solid electrolytic capacitor having a height of 2 mm and a height of 1.2 mm can be obtained.

FIG. 2 is a plan view seen from the mounting surface of another embodiment of the present invention. In the present embodiment, the standoff portion 3 on the mounting surface was shaped such that the standoff end on the anode side was trapezoidal and the standoff end on the cathode side was rectangular.

According to the present embodiment, the shape of the standoff portion 3 on the mounting surface is made asymmetric by making the shape of the standoff end on one polarity side asymmetric with the shape of the standoff end on the other polarity side. The polarity can be discriminated from the surface.

As a result, even during the manufacturing process, the polarity can be discriminated by discriminating the shape of the end portion of the standoff portion, and work error can be reduced to zero.

Further, since the solid electrolytic capacitor can be mounted by the bulk method, the taping process using the embossed tape can be eliminated, and the manufacturing cost can be reduced by 10%.

[0014]

As described above, according to the present invention, with respect to the shape of the standoff portion provided on the mounting surface, the shape of the standoff end on one polarity side and the standoff end on the other polarity side are asymmetrical. Therefore, (a) the polarity can be discriminated without making a mistake even when the electrical characteristics are inspected from the mounting surface side, and the product is not destroyed even when a voltage is applied. (B) Since the polarity can be discriminated optically or mechanically from the mounting surface side, bulk mounting can be performed during mounting. And so on.

[Brief description of drawings]

FIG. 1 is a vertical sectional view and a plan view seen from a mounting surface of an embodiment of the present invention.

FIG. 2 is a plan view seen from a mounting surface of another embodiment of the present invention.

FIG. 3 is a plan view seen from a mounting surface of an example of a conventional chip-type solid electrolytic capacitor.

[Explanation of symbols]

 1 Anode lead terminal 2 Cathode lead terminal 3 Stand-off part 4 Surface part 5 Solid electrolytic capacitor element 6 Conductive adhesive 7 Mold resin

Claims (1)

[Claims] 1. A chip-type solid electrolytic capacitor obtained by molding, wherein the shape of a stand-off end portion provided at an intermediate portion of a mounting surface on which an anode lead terminal and a cathode lead terminal are arranged is a positive electrode side and a negative electrode side. Chip-type solid electrolytic capacitor characterized in that they are made different from each other to be asymmetrical.