JPS5824432Y2 - Cotai Denkai Capacitor - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to the structure of a solid electrolytic capacitor, particularly to the connection between an anode lead wire of an anode body and an anode terminal.

Conventionally, in order to take out the anode terminal of a fixed electrolytic capacitor, a part of the anode lead wire 2 is buried in the capacitor element 1 as shown in Fig. 1, or the anode lead wire 2 is welded to the capacitor element 1 and protrudes. Either one end 3a of the anode terminal 3 is overlapped with the part 2a and welded, or the anode lead wire 2 and the anode terminals 2a and 3a are butted against each other and welded as shown in FIG. In many cases, a connection method has been used in which the anode terminal 3 is welded in a direction perpendicular to the lead wire 2.

Although these welding connection methods are currently widely used, they have the following drawbacks.

That is, in solid electrolytic capacitors formed using these terminal structure connection directions, especially chip-shaped capacitors intended for miniaturization, there is only one direction in which the capacitors can be attached to the substrate.

For this reason, when installing capacitors, it was necessary to arrange them not only in terms of polarity but also in the vertical direction.

The present invention eliminates these drawbacks, provides an anode terminal structure that is convenient for mounting on a board, and is extremely effective for small solid electrolytic capacitors, especially chip solid electrolytic capacitors, and more specifically, a connection structure between the anode lead wire and the anode terminal. It provides:

That is, the solid electrolytic capacitor according to the present invention is a non-exposed solid electrolytic capacitor in which the anode terminal connected to the anode lead wire of the capacitor element and the cathode layer of the capacitor element are directly mounted, and the anode terminal is It is made of a conductive flat plate having a main surface substantially orthogonal to the lead wire, has a slit into which the lead wire is inserted, is connected to the lead wire at the slit portion, and has upper and lower surfaces in the direction of the slit. is characterized by being the implementation side.

Next, embodiments of the present invention will be explained in detail with reference to the drawings.

FIG. 4a shows an anode terminal plate 4 having slits at regular intervals, and the width of the slit portion 4a of the anode terminal plate 4, which is connected almost orthogonally to the anode lead wire 2, is slightly larger than the anode lead wire. is formed.

The notched portions 4b are provided to facilitate separation of the anode lead wire 2 into two capacitors after welding.

FIG. 4 is a perspective view of an anode terminal plate 4 having a slit 4a welded to a capacitor element 1 having an anode lead wire 2.

That is, the anode lead wire 2 and the anode terminal plate 4 are brought into contact with each other at the slit portion 4a, and welding is performed between the anode lead wire 2 and the anode terminal plate 4 by resistance welding, laser, electron beam, or the like.

After welding is completed, the capacitor elements are separated into individual capacitor elements at the notches 4b to obtain a capacitor with exposed elements, that is, a non-exposed chip capacitor in which the cathode layer of the capacitor element 1 and the anode terminal 4 are directly mounted as mounting surfaces.

Incidentally, in order to reinforce the welded portion, a resin 6 may be applied between the capacitor element 1 and the anode terminal 4 as shown in FIG.

At this time, the shape of the capacitor element 1 is made square in advance, and the size of the slit after cutting, that is, the anode terminal,
If the thickness is made slightly larger than that of , it becomes possible to mount not only the normal A and B sides but also the C9D side.

Further, if a ferromagnetic metal such as nickel is used as the symmetry of the anode terminal plate having a slit, the polarity of the capacitor can be easily adjusted by magnetism, making it very easy to automate the mounting.

As described above, by using the anode terminal plate with slits of the present invention, the effective connection surface for mounting to the board increases, the degree of freedom in mounting as a chip-shaped component increases, and the number of mounting steps can be significantly reduced. It is.

In addition, it is extremely easy to determine the polarity of the capacitor, and the automation of mounting becomes simple. Therefore, the present invention has great industrial value.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a conventionally widely used overlapping welding between an anode terminal and an anode lead wire, and Fig. 2 is a perspective view of butt welding between an anode terminal and an anode lead wire. FIG. 3 is a perspective view of an example of a conventional chip solid electrolytic capacitor with an exposed capacitor element, and FIG.
5 shows an embodiment of an anode terminal plate having a slit according to the present invention, the same figure is an assembled view of a welded embodiment according to the present invention, and FIG. 5 shows a perspective view of an exposed element type chip solid electrolytic capacitor according to the present invention. . Symbols in the figure 1: Container element, 2: Anode lead wire, 2a: Protruding part of 2, 3: Anode terminal, 3a: One end of 3, 4: Anode terminal plate, 4a Nislit, 4b: Notch part, 4 -1: Anode terminal separated by the notched portion 4b, 5: Metal plate, 6: Exterior resin, A, B, C, D: Connection surface to the board.

Claims (1)

[Scope of utility model registration request] In a non-exterior type solid electrolytic capacitor in which an anode terminal connected to an anode lead wire of a capacitor element and a cathode layer of the capacitor element are directly mounted surfaces, the anode terminal has a main surface substantially orthogonal to the lead wire. The conductive plate has a slit into which the lead wire is inserted, and is connected to the lead wire at the slit portion, and the upper and lower surfaces in the direction of the slit are mounting surfaces. A non-exterior type solid electrolytic capacitor featuring: