JPS6017899Y2 - Electrolytic capacitor - Google Patents

Description

[Detailed Description of the Invention] This invention relates to electrolytic capacitors, and in particular to improvements in the terminal structure of tubular electrolytic capacitors.

FIG. 1 shows how a tubular electrolytic capacitor is mounted on a printed wiring board.

That is, in this type of electrolytic capacitor, a cathode side connection terminal 6 is formed in an aluminum outer case 4 that encloses an electrolytic capacitor element 2, and an elastic sealing member 8 that seals the outer case 4 is an insulator. A connecting terminal 10 on the anode side is formed passing through the inside of the housing, and each connecting terminal 6, 10 is formed to protrude from the end surface of the outer case 4.

Therefore, such electrolytic capacitors can be used on printed wiring board 1.
2, bend each connection terminal 6, 10 at right angles toward the wiring conductor 14 at the connection point as shown in the figure.
In addition, since the printed wiring board 12 is penetrated and connected to the wiring conductor 14 by soldering 16, the area occupied by this type of electrolytic capacitor on the printed wiring board 12 is not only the projected area of the electrolytic capacitor but also the connection terminals 6 and 10. Area needs to be considered.

That is, as shown in Fig. 1, the area given by the length L of the electrolytic capacitor plus the length 'iv''2 of the bent portion of the connecting terminals 6 and 10 is the area occupied by the mounting. Become.

Therefore, this type of electrolytic capacitor has the disadvantage that its mounting area is larger than its size.

The purpose of this -1 is to provide an electrolytic capacitor in which the mounting area can be reduced by 1 by forming at least one connection terminal on the peripheral side of the outer case in the tubular electrolytic capacitor.

This invention provides an electrolytic capacitor in which an electrolytic capacitor element is enclosed in a metal exterior case, a cathode side connection terminal is formed in the exterior case, and an anode side connection terminal is formed through an elastic sealing body that seals the exterior case. The device is characterized in that a small number of the cathode side connection terminals are provided on the circumferential side of the exterior case in a direction perpendicular to the exterior case.

An embodiment of this invention will be described in detail with reference to the drawings.

FIG. 2 shows an embodiment of the electrolytic capacitor of this invention.

In the figure, this electrolytic capacitor has a thick part formed on the inner peripheral surface near the bottom of an aluminum exterior case 4 that houses an electrolytic capacitor element 2, and a cathode side connection is formed on the outer peripheral surface of this thick part. The terminal 18 is fixed by a fixing means such as welding.

In this case, the internal lead 20 drawn out from the electrode foil on the cathode side of the electrolytic capacitor element 2 is electrically connected to the exterior case 4, and the connection terminal 22 on the anode side is similar to the electrolytic capacitor shown in FIG. It is formed in the form.

If the cathode side connection terminal 18 is provided on the circumferential side of the exterior case 4 in a direction perpendicular to the exterior case 4, it is not necessary to bend the connection terminal 18 when mounting it on a printed wiring board or the like. , it is possible to omit the trouble of bending the connecting terminal 10, and to reduce the mounting area of a printed wiring board, for example.

Further, the thick portion formed on the inner circumferential surface of the exterior case 4 in the above embodiment can obtain the same effect by forming the bottom surface of the exterior case 4 with a uniform thickness as shown in FIG. In addition, if the connection terminal 18 can be secured to the outer case 4 with a large strength, it is not necessary to form such a thick portion.

FIG. 4 shows another embodiment of this invention.

In the electrolytic capacitor of this embodiment, in addition to the form of the cathode side connection terminal 18 of the previous embodiment, an anode side connection terminal 22 is also formed on the circumferential side of the exterior case 4 in a direction perpendicular to the exterior case 4.

That is, an L-shaped through hole 26 is bored inside the elastic sealing body 24 that seals the outer case 4 from the inner end surface toward the peripheral side, and the outer case 4 is aligned with the through hole 26. An opening 28 is also formed in the peripheral surface of the tube.

The internal lead 30 on the anode side formed in an L-shape of the electrolytic capacitor element 2 is pulled out from the through hole 26 of the elastic sealing body 24 and the opening 28 of the outer case 4.
A metal wire that can be soldered is connected to the end of the anode to form a connection terminal 22 on the anode side.

In this case, in order to ensure electrical insulation between the connection terminal 22 and the exterior case 4, a part of the elastic sealing body 24 is inserted into the opening 28 of the exterior case 4 from which the connection terminal 22 is pulled out, so that the peripheral surface of the connection terminal 22 is Expose by covering.

In this case, crimping to maintain airtightness in the outer case 4 and curling of the open end are performed by conventional methods.

By forming each of the connection terminals 18.22 on the peripheral side surface of the outer case 4 in this manner, the work of bending the connection terminals 18.22 can be omitted, and the mounting area can be reduced.

In each embodiment, the outer case is made of aluminum, but since the outer case differs depending on the electrode material of the electrolytic capacitor element to be enclosed, the metal material forming the outer case is not limited to aluminum.

As explained above, according to this invention, it is possible to improve the mounting area, eliminate the trouble of bending the connection terminals, etc., and improve the efficiency of wiring work.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing the mounting form of a conventional tubular electrolytic capacitor, Fig. 2 is a partially cutaway side view showing an embodiment of this invention, and Fig. 3 is a similar side view showing a modification thereof. , FIG. 4 is a partially cutaway side view showing another embodiment of this invention. 2... Electrolytic capacitor element, 4... Exterior case, 6, 18... Connection terminal on cathode side, 1
0, 22... Connection terminal on the anode side, 24...
...Elastic sealing body.

Claims (2)

[Scope of utility model registration request] (1) An electrolytic capacitor in which an electrolytic capacitor element is enclosed in a metal exterior case, a cathode side connection terminal is formed in the exterior case, and an anode side connection terminal is formed through an elastic sealing body that seals the exterior case, An electrolytic capacitor characterized in that at least the cathode side connection terminal is provided on a circumferential side surface of the exterior case so as to protrude in a direction orthogonal to the exterior case. (2) The electrolyzer according to claim 1 of the utility model registration claim, characterized in that the anode side connection terminal is formed on the circumferential side of the outer case by penetrating the elastic sealing body and the outer case in the circumferential direction. capacitor.