JPH03250721A - Electrolytic capacitor - Google Patents

Abstract

PURPOSE:To mount plural electrolytic capacitors within low height on a surface at low cost by storing the plural electrolytic capacitors in a simple structure case member with open top by laying the capacitors in parallel. CONSTITUTION:Single ended electrolytic capacitors 11, 12 are prepared with a case member 15 which is a short height box with open top and has sizes capable of storing the plural electrolytic capacitors 11 and 12 in parallel. The plural electrolytic capacitors 11 and 12 are stored in the case member 15 and their prescribed lead terminals 11a, 11b, 12a and 12b are bent in a almost L shape from the side walls 15a-15d of the case member to a bottom 15e. Therefore, the electrolytic capacitors 11 and 12 are stored in the case member 15 in parallel so as to be packed. Thus, handling is facilitated, the capacitor is permitted to be short in height and necessary capacitance is ensured. heat from the circuit base board side is cut by the bottom 15e of the case member 15 when soldering and characteristic deterioration is suppressed.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an electrolytic capacitor device, and more specifically, to an electrolytic capacitor device in which a plurality of unidirectional electrolytic capacitors are housed in a case member to form a unit. It is something.

[Conventional technology]

As shown in FIG. 6, an aluminum electrolytic capacitor 1 with leads in the same direction is normally mounted vertically on one circuit board 2. As shown in FIG. However, according to this, the axial length of the case becomes the height dimension, which may cause problems in the north where the height is becoming lower.

Therefore, in order to reduce the height while ensuring the same electrostatic response as the electrolytic capacitor 1, and also to enable surface mounting like other electronic components, we developed a capacitor as shown in Fig. 7. , prepare two aluminum electrolytic capacitors 3, 3 with half the capacity, bend their respective lead terminals 3a, 3b into an almost L-shape along the metal case 3C, and then lay them horizontally on the circuit board 2. I try to juxtapose them.

Another method is as shown in Figure 8.
The height of the aluminum electrolytic capacitor 4 is reduced by using an aluminum electrolytic capacitor 4 in which a capacitor element having the same capacitance as the electrolytic capacitor 1 is housed in a flat metal case 4c having an elliptical cross section. Even when this is a surface mount type, each lead terminal 4a, 4b is bent into a substantially L-shape along the flat metal case 4C.

[“Problem that the invention seeks to solve”]

In either case, the height can be made lower than when mounted vertically, but this has the following drawbacks. That is, in the conventional example shown in FIG. 7, first, the number of electrolytic capacitors used is doubled, which increases the number of assembly steps and also makes parts management difficult. In addition, in the case of surface mounting, most of the soldering is done by beam flow soldering, but when soldering the electrolytic capacitor 3, it sometimes receives heat directly from the circuit board 2 side. , there is a risk of deterioration of characteristics.

On the other hand, in the case of the conventional example shown in FIG. 8, the number of parts does not increase, but since the cross section of the metal case 4 is elliptical, sealing is difficult and reliability in this respect is poor. In addition, since the shape is special, it requires specialized manufacturing equipment, which makes the cost more expensive. Furthermore, similar to the conventional example described above, soldering has the problem of adverse effects due to the heat generated during soldering.

[Means to solve the problem]

This invention was made to solve the above problems,
Its structural features include a plurality of lead co-directional electrolytic capacitors, and a case member that is a shallow box with an open top surface and is large enough to accommodate a plurality of electrolytic capacitors side by side. A plurality of electrolytic capacitors are housed in a case member, and predetermined lead terminals thereof are bent into a substantially L-shape from the side wall to the bottom wall of the case member.

In this case, each electrolytic capacitor is preferably connected in parallel, and only two predetermined lead terminals thereof are bent into a substantially L-shape from the side wall to the bottom wall of the case member. Furthermore, a gutter-like groove corresponding to the outer shape of each electrolytic capacitor may be formed in the bottom wall of the case member. Furthermore, an electrically neutral dummy terminal may be provided on the bottom wall of the case member on the opposite side from the lead terminal drawer side.

[For production]

Since the electrolytic capacitors are housed side by side in the case member and put into a bag, handling is convenient, the height can be reduced, and the required capacitance can be secured. Also, soldering is time.

Since heat from the circuit board side is blocked by the bottom wall of the case member, there is almost no risk of deterioration of characteristics.

Furthermore, by connecting each electrolytic capacitor in parallel and drawing out only two predetermined lead terminals,
Accordingly, the wiring pattern of the circuit board can be simplified.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 1 to 5.

Referring first to the exploded perspective view of FIG. 1 and the front view of FIG.
Two lead codirectional aluminum electrolytic capacitor 1
1.12, and a case member 15 for unitizing the electrolytic capacitors 11 and 12.

The case member 15 is a box with an open top and a shallow bottom, and is large enough to accommodate the electrolytic capacitors 11 and 12 side by side. To be more specific,
The case member 15 has four side walls 15a to 5d and a bottom wall 15e. According to this embodiment, electrolytic capacitors 11 and 12 are arranged side by side on the bottom wall 15e.
That is, storage recesses 16a and 16b are provided for storing the metal cases so that they are adjacent to each other and their axes are substantially parallel to the circuit board 2.

In this case, the storage recesses 16a, 16b are formed in a gutter shape to match the outer shape of each electrolytic capacitor 1, . Accordingly, since the contact area with respect to the circuit board 2 is small, it is difficult to be affected by thermal effects when soldering is performed, for example, by reflow soldering.

The electrolytic capacitors 11 and 12 are housed in the case member 15 and fixed, for example, with a suitable adhesive; in this example, the depth of the case member 15 is equal to the depth of the electrolytic capacitor
．． It is said to be about half of what it would be if 12 were placed horizontally.

To enable surface mounting, each electrolytic capacitor 11°12
Lead terminals 11a, llb; 12a, 12
b is approximately L from the front side wall 1.5a to the bottom wall 15e.
Can be folded into a letter shape. In connection with this, a lead storage groove 17 for the lead terminal is provided from the side wall 15a to the bottom wall 15e. The depth of the lead storage groove 17 is determined in relation to the wire diameter of the lead terminal, and in this example it is approximately half the wire diameter, but unlike this, the depth is the same as the wire diameter. Good too.

Also, referring to FIGS. 3 and 4, in order to prevent the Manhattan phenomenon (a phenomenon in which the case member 15 lifts up backwards), which is a problem peculiar to surface mount soldering,
An electrically neutral dummy terminal 20 is provided on the bottom surface of the rear side of the case member 15, that is, the bottom surface on the opposite side from the lead terminal extraction side. According to this example, the dummy terminal 20 has a locking part 20a that is installed across the rear side wall 15c, and a case member]5 from the lower end of the locking part 20a.
The terminal part 2 is bent at an almost right angle along the bottom surface of the
0b, and is attached, for example, with a suitable adhesive.

In this embodiment, the dummy terminal 20 is provided on the side of one of the four storage sections 16b, but it may be placed on the side of the other storage recess 16a. In particular, in the case of audio use, the sound quality can be improved by connecting the metal cases of each electrolytic capacitor 11, 12 to the dummy terminal 20 with appropriate lead wires.

Although not shown in detail, in this embodiment, the circuit board 2 includes, for example, a wiring pattern connecting the positive lead terminals 11a and 12a, and a negative lead terminal 11.
A wiring pattern is formed to connect the electrolytic capacitors 11 and 12b, respectively, so that the electrolytic capacitors 11 and 12 are connected in parallel. Side lead terminal 12
a and the negative side lead terminal 12b are connected to the positive side lead terminal 11a and the negative side lead terminal 11.a of the electrolytic capacitor 11, respectively. b, and the positive side lead terminal 11a
Only the negative side lead terminal 11b may be drawn out to the outside of the case member 15. According to this, the wiring pattern of the circuit board 2 can be made simpler.

〔Effect of the invention〕

As explained above, according to the present invention, by storing a plurality of electrolytic capacitors side by side in a case member with a simple structure and an open top surface, the plurality of electrolytic capacitors can be placed low at low cost. Moreover, it can be made into a surface-mountable unit. Also, when soldering, the heat from the circuit board side is blocked by the case member, so
There is no risk of property deterioration due to the heat.

[Brief explanation of drawings]

1 to 5 relate to an embodiment of the present invention, in which FIG. 1 is an exploded perspective view of an electrolytic capacitor device according to the embodiment, FIG. 2 is a front view of the device, and FIG. 3 is a front view of the device. The right side view, Figure 4 is a bottom view of the device, Figure 5 is a perspective view showing the lead terminals connected in parallel, Figures 6 to 8 are
Each figure is a perspective view showing a conventional example. In the figure, 1.1.12 are electrolytic capacitors, lla, 1
1. b. 1.2a, 12b are lead terminals, 15 is a case member, 1
5a-15d are side walls, 15e is a bottom wall, 16a, 1
6b is a storage recess, 17 is a lead storage groove, and 20 is a dummy terminal.

Claims (4)

[Claims] (1) A case member comprising a plurality of lead co-directional electrolytic capacitors and a shallow box with an open top surface and having a size capable of accommodating the plurality of electrolytic capacitors side by side; An electrolytic capacitor device characterized in that an electrolytic capacitor is housed in the case member, and predetermined lead terminals of the electrolytic capacitor are bent into a substantially L-shape from the side wall to the bottom wall of the case member. (2) The electrolytic capacitor device according to claim 1, wherein each of the electrolytic capacitors is connected in parallel, and only two predetermined lead terminals thereof are bent into a substantially L shape from the side wall to the bottom wall of the case member. (3) Claim 1, wherein a gutter-like groove corresponding to the outer shape of each electrolytic capacitor is formed in the bottom wall of the case member.
Or the electrolytic capacitor device according to 2. (4) The electrolytic capacitor device according to claim 1, 2 or 3, wherein an electrically neutral dummy terminal is provided on the bottom wall of the case member on the opposite side from the lead terminal extraction side.