JPH0325395Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a chip-type aluminum electrolytic capacitor.

[Technical background of the invention and its problems]

In recent years, as electronic devices have become increasingly compact and lightweight, there has been remarkable progress in chipping various electronic components, and small-capacity aluminum electrolytic capacitors are no exception; leadless chip-type aluminum electrolytic capacitors are now available in various types. It has been proposed and is now at the stage of full-scale practical application. Among the various chip-type aluminum electrolytic capacitors that have been proposed, the structure that has attracted the most attention so far is disclosed in Japanese Patent Application Laid-Open No. 59-211213;
This is disclosed in JP-A No. 214216 and Japanese Patent Application Laid-Open No. 59-219922.

The technology disclosed in the above publication is, for example, the 5th publication.
As shown in the figures and FIG. 6, a capacitor element 21 impregnated with a driving electrolyte is housed in a metal case 22, and a sealing member 24 for sealing the open end of the case 22 is connected to a lead wire 23 connected to the element 21. A capacitor main body 25 is drawn out through the capacitor main body 25, a through hole 26 is disposed in contact with the end surface from which the lead wire 23 of the capacitor main body 25 is drawn out, and a through hole 26 through which the lead wire 23 passes, and a through hole 26 is formed on the outer surface of the capacitor main body 25. and an insulating plate 28 provided with a connecting recess 27, and the tip of the lead wire 23 passing through the through hole 26 is left as a round rod or is flattened to form the recess 2.
7, and the bent portion serves as an adhesive portion to the substrate. As shown in FIG. 8, the chip-type aluminum electrolytic capacitor having the above structure has a wound-type capacitor element 29 impregnated with a driving electrolyte and placed in a metal case.
A lead wire 32 pulled out from an aluminum electrolytic capacitor, which is housed in a comb-shaped terminal 33 and whose opening end is sealed with a sealing material 31, is connected to a comb-shaped terminal 33, and the entire body except the comb-shaped terminal 33 is covered with a molded resin exterior 34.
Compared to products that are coated with molded resin, they are not exposed to the harsh conditions of high temperature and high pressure during the molded resin exterior, so there is no deterioration in characteristics such as a decrease in capacitance or an increase in tanδ due to evaporation of the drive electrolyte. Furthermore, there is no problem of increased costs associated with molded resin exterior packaging, and it can be said to be suitable as a structure that can contribute to miniaturization to the maximum extent. However, the through hole 26 constituting the insulating plate 28 generally has a round cross-sectional shape as shown in FIG. Since it is common to perform flattening beforehand, the through hole 26 is approximately twice the diameter of the lead wire 23, and the through hole 26 and the lead wire 23 are
The degree of fit is quite loose. Therefore, when the flat part of the lead wire 23 is passed through the through hole 26 and the flat part is bent, the direction of the flat part is not determined and the bent part does not fit into the recess 27 .
In this case, the bent portion of the lead wire 23 protrudes from the outer surface of the insulating plate 28, resulting in poor stability and the risk of it falling over when placed on the board, making it unsuitable for practical use. I had an extremely inconvenient problem.

[Purpose of invention]

The present invention has been devised in view of the above points, and it is an object of the present invention to provide an inexpensive chip-type aluminum electrolytic capacitor that is easy to work with and can ensure stable attachment to a circuit board.

[Summary of the idea]

The chip-type aluminum electrolytic capacitor of the present invention includes a bottomed cylindrical metal case, a capacitor element housed in the case, a pair of lead wires led out from the element, and a pair of lead wires extending through the case opening end. a capacitor body comprising a sealing body sealed with a capacitor body, a flat part formed at the tip of the pair of lead wires, and a cross-sectional shape of the capacitor body arranged in contact with the lead wire extraction surface on the lead wire extraction surface side; It is equipped with an insulating plate consisting of a pair of lead wire through holes that are round and elongated on the outer surface side, and a recess provided on the outer surface to connect to the pair of through holes, and a recess that extends through each of the through holes. The device is characterized in that the flat portions of the pair of lead wires are bent and housed in the recess.

[Example of idea]

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. That is, as shown in FIGS. 1 and 2, a capacitor element 1 formed by winding an anode foil and a cathode foil with a spacer interposed therebetween and impregnating the drive electrolyte is placed in a bottomed cylindrical metal case 2. A pair of lead wires 3 housed in a capacitor element 1 and connected to the capacitor element 1 are drawn out through a sealing body 4 whose open end is sealed, and a flat portion 5 is formed at the tip of the pair of lead wires 3. As shown in FIGS. 3 and 4, the lead wire through hole 10 has a long shape 7 on one side, a round shape 8 on the other side, and a stepped portion 9 approximately in the center on the end surface of the lead wire 3 of 6. and the lead wire through hole 1
An insulating plate 12 having a recess 11 connected to the elongate 7 and extending in the width B direction of the elongate 7 on one side of the elongate 7 of 0 is brought into contact with the surface on which the recess 11 is provided on the outside. , the pair of lead wires 3 are inserted into the through hole 10.
The flat portions 5 at the tips of the pair of lead wires 3 are respectively bent in opposite directions and housed in the recess 11.

According to the chip type aluminum electrolytic capacitor constructed as described above, the shape of the lead wire through hole 10 provided in the insulating plate 12 at the portion where the flat portion 5 at the tip of the lead wire 3 is drawn out is elongated. Therefore, the direction of the flat part 5 is pulled out in a uniform direction along the elongate 7, and the recess 11 connected to the elongate 7 is formed to extend in the width B direction of the elongate 7. Therefore, when the flat portion 5 at the tip of the lead wire 3 is bent, the bent portion does not protrude from the recess 11 and is reliably accommodated within the recess 11.

Therefore, the lead wire 3 is inserted into the lead wire through hole 10.
The tip of the lead wire 3 pulled out from the lead wire through-hole 10 can be removed without any troublesome work such as direction correction so that the direction of the flat part 5 of the tip of the lead wire 3 that has been passed through the lead wire and pulled out is accommodated in the recess 11. It has the advantage that a stable attachment state to the board can be ensured by simply bending the flat portion 5 of the board in a predetermined direction.

[Effect of idea]

According to the present invention, it is possible to obtain a chip-type aluminum electrolytic capacitor that is inexpensive and of high practical value, which is easy to work with and can ensure a stable mounting state on a board.

[Brief explanation of the drawing]

Figures 1 to 4 relate to one embodiment of the present invention, and Figures 1 and 2 show a chip-type aluminum electrolytic capacitor, with Figure 1 being a perspective view and Figure 2 being a perspective view.
The figure is a partially sectional front view, and Figure 3 is the same as Figures 1 and 2.
A plan view of the insulating plate composing the figure, Figure 4 is Figure 3A.
-A sectional view, FIGS. 5 and 7 show a chip-type aluminum electrolytic capacitor according to a conventional example. FIG. 5 is a perspective view, FIG. 6 is a partially sectional front view, and FIG. 6 is a plan view of an insulating plate constituting the insulating plate, and FIG. 8 is a front sectional view of a chip type aluminum electrolytic capacitor according to another conventional reference example. 1...Capacitor element, 2...Metal case, 3
... Lead wire, 4 ... Sealing body, 5 ... Flat part, 6
...Capacitor body, 7...Long shape, 8...Round shape,
10...Lead wire through hole, 11...Recess, 12...
...Insulating board.

Claims (1)

[Scope of utility model registration request] A cylindrical metal case with a bottom, a capacitor element housed in the case, a pair of lead wires led out from the element, a sealing body that allows the lead wires to pass through and seals the open end of the case, and the pair of capacitor elements. A capacitor body consisting of a flat part formed at the tip of the lead wire, and a cross-sectional shape of the capacitor body disposed in contact with the lead wire extraction surface are round on the lead wire extraction surface side and elongated on the outer surface side. an insulating plate comprising a pair of lead wire through-holes, and a recess provided on an outer surface of the plate connected to the pair of through-holes; A chip-type aluminum electrolytic capacitor characterized in that it is bent and housed in the recess.