JPH0568845B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to polar capacitors, and more particularly to the arrangement of lead terminals of solid electrolytic capacitors.

Conventional polar capacitors 10 and 20 are symmetrical in appearance, as shown in FIG. 1A and FIG. 2A, respectively.However, as shown in FIGS. 1B and 2B, respectively, The polarities of the lead terminals 11 and 21 are not arranged symmetrically when viewed from the center of the terminal drawing surface, so when mounting them on a printed circuit board, etc., insert them with the opposite polarity, and the mounted circuit may not work properly or the capacitor may In many cases, it was destroyed.

SUMMARY OF THE INVENTION An object of the present invention is to provide a polarized capacitor that can be used in any direction without any problem with polarity, which eliminates the conventional drawback of inserting the capacitor with the wrong polarity.

That is, the present invention provides a polar capacitor consisting of a solid electrolytic capacitor having a plurality of polarized terminals that are drawn out in approximately the same direction.
The present invention provides a composite or single polar capacitor characterized in that terminals located symmetrically from approximately the center of a surface where three or more terminals are drawn out in a line have the same polarity.

Next, a first embodiment of the present invention will be explained in detail with reference to FIG. 3A, B, and C are examples of the polarized capacitor according to the present invention, A is an assembly diagram, B is an equivalent circuit, and C is an example of a terminal drawing surface.

First, a metal with valve action such as tantalum was formed into the desired shape, anodized to form a dielectric material, and conductive layers of manganese dioxide, graphite, and silver-based were sequentially formed.Four pieces were arranged in a line. The anode lead wires 2 of the capacitor element 1 are connected to each other with tantalum and a weldable metal bonding wire 3 to be integrated, and the common anode lead terminal 5 is taken out approximately at the center of the terminal lead-out portion, and then the cathode lead terminal 4 is taken out.
is taken out from each capacitor element 1 and pulled out in one direction, and the four capacitor elements 1 are coated with an exterior resin 6 such as epoxy. In the above-mentioned embodiment, the anode terminals of each capacitor element were integrated, but there is no problem in preventing incorrect insertion even if the anode and cathode terminals are interchanged and the cathode terminal is pulled out as one in the center. Of course.

Next, another embodiment of the present invention will be described using FIG. 4. FIG. 4 shows four methods of arranging terminals according to the present invention for a composite capacitor in which a plurality of capacitors are housed in one package (indicated by dotted lines), and one terminal according to the present invention for a single capacitor with one capacitor element. The arrangement method is shown in a schematic diagram, and in FIG. 4A, for example, the anode terminals of a plurality of capacitor elements are integrated,
Anode lead terminals are arranged at both ends of a plurality of cathode terminals drawn out from each element. In this method, the electrode of the capacitor element drawn out integrally can be an anode or a cathode in exactly the same manner, and the number of capacitor elements is not limited to three or more than four. In FIG. 4B, one integrated electrode terminal is arranged in the center of the other electrode terminal drawn out individually, and here they are integrated using the same arrangement method as in the first embodiment. This shows the case where an electrode terminal and a cathode are used. It goes without saying that this terminal arrangement can be similarly carried out even when the number of capacitor elements is 2, 4, 8, etc. other than 4. In FIG. 4C, the anode terminals of two capacitor elements are individually arranged adjacent to each other at approximately the center of the extraction surface, and the cathode terminals of each are arranged outside the anode terminal. When looking at the terminals from approximately the center of the lead-out surface of the capacitor, terminals that are symmetrical have the same polarity.Even in this case, the positions of the anode and cathode terminals may be interchanged, or the position of the capacitor element may be changed. The number is 4 even if it is not 2
This can be applied when using any even number such as 1, 6, etc. Figure 4D shows the cathode terminal integrated and pulled out.
Using two sets of two capacitor elements with individual anode terminals drawn out, the integrated cathode terminals in each set are arranged toward both ends of the terminal drawing surface, and the anode terminals are arranged between the two cathode terminals. This is what I did. In this case, the anode and cathode may be interchanged as they are, or the number of capacitor elements is completely free, although the case where two capacitor elements are packaged as two sets is shown here. Fourth
Figure E shows a three-terminal structure in which an anode terminal is drawn out from one capacitor element, and two cathode terminals connected to the same cathode at both ends of the anode terminal are arranged and packaged. In theory, the two-branched terminal could be an anode just from the point of view of preventing incorrect insertion, but if you take into account not only the prevention of incorrect insertion but also the manufacturing cost,
The branched terminal is preferably a cathode. because,
When using an actual tantalum solid electrolytic capacitor, the anode lead wire 2 is drawn out from approximately the center of the solid electrolytic capacitor element as shown in Figure 3A. When connecting the branched anode terminals, arranging the three terminals in a line with the cathode terminal as the center would be cumbersome in terms of short-circuit prevention, etc., and cannot be said to be practical. On the other hand, when the cathode terminal is branched into two branches, in general tantalum solid electrolytic capacitors, in which the anode lead wire is originally placed in the center, the cathode layer is located on both sides of the anode lead wire. The connection work can be done without any difficulty in arranging the terminals in a row, and it is possible to obtain a three-terminal resin-clad tantalum solid electrolytic capacitor that is low cost and highly mass-producible, resulting in an extremely practical structure. Has great advantages.

As described above, in the polarized capacitor according to the present invention, the lead terminals of the same polarity are located symmetrically from the center of the terminal part, so no matter which direction the capacitor is inserted, the printed circuit board can be designed in advance to match the polarity of the capacitor. If you do this, there will be no polarity errors when inserting. This is particularly advantageous for thin devices in which terminals are arranged in a row.

[Brief explanation of the drawing]

Figure 1A is a plan view showing a conventional polar capacitor, Figure 1B is its equivalent circuit diagram, Figure 2A is a plan view showing a conventional composite polar capacitor, and Figure 2B is its equivalent circuit diagram. 3A is an assembled diagram showing a polarized capacitor of the present invention; FIG. 3B is an equivalent circuit diagram thereof; and FIGS. 4A to 4E are schematic diagrams of other embodiments of the present invention by type. This is a diagram shown in . Symbols in the diagram: 1, 10, 20...Capacitor element, 2...Anode extraction lead wire, 3...Anode coupling wire, 4...Cathode lead terminal, 5...Common anode lead terminal, 6...Exterior resin , 11, 21...Lead terminal.

Claims (1)

[Claims] 1 One anode terminal is pulled out from one tantalum solid electrolytic capacitor element coated with an exterior resin, and two cathode terminals which are connected to the cathode of the tantalum solid electrolytic capacitor element and which are bifurcated are connected to the Pull out along both sides of the anode terminal,
A three-terminal polar capacitor, characterized in that the two cathode terminals are arranged in a line in a symmetrical positional relationship with the anode terminal as the center.