JPS6015334Y2 - Electrolytic capacitor with self-holding terminal conductor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to resin-coated electrolytic capacitors having terminal conductors configured to facilitate attachment and engagement to circuit boards and the like.

Resin-coated solid electrolytic capacitors are well known in the art and are described in U.S. Pat. No. 3,646,404.

This patent also describes terminal conductor shapes that are generally suitable for installation on circuit boards.

However, the shape of the terminal conductor in this U.S. patent, as well as other known shapes, is important in several important respects, such as mounting to avoid accidental polarity mix-ups, soldering to prior retention, In terms of uniform installation and other aspects, we are not completely satisfied.

It is therefore an object of the present invention to provide an electrolytic capacitor having terminal conductors which are easy to install and which are particularly suitable for engagement with circuit boards.

Other objects will become apparent from the following detailed description with reference to the accompanying drawings.

The invention may be better understood by referring to FIG.

FIG. 1 illustrates a sintered solid electrolytic capacitor made of tantalum, aluminum or other film-forming metal; 10 indicates the capacitor body;
This capacitor body 10 includes an anode made of the above metal, a dielectric made of an oxide film formed on the surface of the anode,
It consists of an electrolyte layer on the oxide film and a conductive cathode layer, for example a silver layer, on the electrolyte layer, and a metal lead-out rod 20 is attached to the anode.

The anode and cathode terminal conductors designated 30 and 40 are 3
It is coupled to the capacitor body by welding, as shown at 5, and by soldering, as shown at 45, respectively, and the assembly is housed within a resin envelope, indicated at 50, by conventional techniques.

With further reference to FIG. 1, the cathode terminal conductor 40 includes a relatively narrow partial strip 60 formed to fit loosely into a slightly larger hole 62 in a conventional circuit board, indicated at 64. .

The middle lateral portion 66 of the cathode terminal conductor 40 is connected to the circuit board 64.
, as well as the corresponding lateral portion 68 of the anode terminal conductor 30 .

The vertical portion 70 of the cathode terminal conductor 40 is coupled by solder to the cathode of the capacitor as described above.

The anode terminal conductor 30 is a tantalum weldable and solderable nickel silver (typical composition is 55% Cu).

26.75% Zu, 18% Ni, 0.25%
a relatively wide strip-like portion 72 formed of an elastically deformable metal such as Mn); Vertical portion 74 and anode lead-out rod 20
It has a transverse portion 76 welded at 35 to the lateral portion 76 .

As can be seen from FIG. 1a, the relatively wide portion 72 of the anode terminal conductor 30, when inserted into the hole 80 of the circuit board 64, is designated at 82 because the hole 80 is relatively narrow. The end portion 78 is elastically deformed by the side edges 83 of the hole 80 so as to be elastically deformed.

When passed through the hole 80, the resilient end 78 is shown at 8 in FIG. 1a.
It returns to its initial shape as shown at 5 and engages the capacitor with the circuit board 64.

The elastic deformation of the end portion 78 results in a relatively wide strip-like portion 7.
This can be facilitated by providing a lance cut as indicated by 84 in 2.

As mentioned above, when the capacitor is inserted into the circuit board 64, which can be done manually or automatically by a machine, the capacitor is inserted into the end 78 of the anode terminal conductor 30.
and the contact of the lateral portions 66 and 68 of the cathode and anode terminal conductors.

The capacitor is then soldered at 90 as shown in FIG.
and 92 can be conveniently joined to derivatives 86 and 88.

The capacitor of the present invention aligns the ends of the relatively narrow strip-shaped portions 60 of the cathode terminal conductor 40 with the relatively small holes 62 of the circuit board 64, and also aligns the ends of the relatively narrow strip-shaped portions 60 of the anode terminal conductor 30 with the relatively narrow strip-shaped portions 60 of the anode terminal conductor 30. The circuit board 64 is engaged by aligning the end 78 of 72 with the hole 80 in the circuit board 64.

The strip-like portion 60 of the cathode terminal conductor 40 is surrounded by the hole 62, but fits loosely within the hole 62.

The end 78 of the strip-like portion 72 of the anode terminal conductor 30 is aligned with the hole 80 in the circuit board 64 so that the end 78 of the strip-like portion 72 of the anode terminal conductor 30 is aligned with the hole 80 of the circuit board 64.
0 end a predetermined distance apart.

The width of hole 80 is narrower than the overall width 81 of end portion 78 .

Thus, end 78 is elastically deformed as it passes through hole 80 and returns to its original shape after passing through hole 80, thus engaging circuit board 64.

Since the widths of the anode terminal conductor 30 and the cathode terminal conductor 40 are significantly different, the possibility of reversing the desired polarity when engaged with the circuit board 64 is eliminated.

In addition to ease of installation, the capacitors of the present invention are tightly engaged so that the capacitors will not fall off the circuit board 64 before or during soldering.

With reference to FIG.
A thin sheet 8 centimeters (approximately 0.010 inch to 0.020 inch) thick is suitably stamped to obtain the configuration shown having a plurality of conductor pairs 100 attached to strips 110.

The form shown in Fig. 2 was then transformed into Fig. 3 after receiving the incision work.
The notches are made as indicated by , and the end portion 78 is formed as shown in FIGS. 3 and 3a by gradual pressing with a die and punch.

Thereafter, the capacitor body 10 is attached to the anode terminal conductor 30 by welding the lead-out rod 20 to the anode terminal conductor 30 as shown at 35, as shown in FIG.

This assembly is then conveniently immersed in molten solder to couple the cathode terminal conductor 40 to the capacitor body 10 and the first
Apply a solder coating shown at 45 in the figure.

Following the solder dip step, the assembly is conveniently immersed in a liquid resin, such as an epoxy resin, and is immersed at 50° C. in FIG.
Apply the resin jacket as directed.

This resin jacket includes the capacitor body 10 and the anode lead-out rod 2.
0 as well as most of the vertical portions of the anode terminal conductor 30 and the cathode terminal conductor 40.

After forming the resin jacket 50, the conductor pair 100 is cut at the line 120, resulting in individual completed capacitors of the type shown in FIG.

Chapter 5a. 5b and 50, these figures show different embodiments of end portions 78, or locking configurations, that may be formed by conventional metalworking techniques.

In FIG. 5b, the disclosed embodiment engages circuit board 64 in a manner similar to the embodiment of FIG.

That is, after the end 78'' is elastically deformed and completely passes through the hole 80'', it returns to its original shape and the circuit board 6
4.

In the embodiment of FIG. 5a, end 78' is elastically deformed, compressed, and wedged into hole 80', which preferably has a circular cross-section rather than an elongated cross-section, thereby forming a circuit board 64. engage with.

In the embodiment of FIG. 5c, the end 7B"' is tapered as shown at 81, preferably in the range of about 5° to 10°, and the end 7B"'
hole 80 without any substantial deformation of
``'Wedged inside.

The slight taper of the end 7B'' may provide a firm engagement with the circuit board 64, especially when the circuit board material is a thermosetting resin such as phenolic and glass epoxy materials.

In the above description, the anode terminal conductor is described as having a relatively wide strip-like portion and a locking form, and the cathode terminal conductor is described as having a relatively narrow strip-like portion, Even if this arrangement is reversed, it is within the scope of the present invention.

That is, the cathode terminal conductor may have a relatively wide strip-like portion and a locking configuration, while the anode terminal conductor may have a relatively narrow strip-like portion.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing one embodiment of an electrolytic capacitor according to the present invention, FIG. 1a is a bottom view of FIG. 1, and FIGS.
Figures 5a, 5b and 5c are schematic plan views showing stages in the manufacture of a capacitor of the type shown in Figure 1; Figures 5a, 5b and 5c are schematic views respectively showing other examples of terminal conductors suitable for engagement with a circuit board; be. Explanations of the symbols representing the main parts of the figure are as follows. 10...Capacitor body, 20...Metal lead-out rod, 30...Anode terminal conductor, 35
...Welding, 40...Cathode terminal conductor, 4
5...Solder, 50...Resin jacket, 60
. . . Relatively narrow strip-shaped portion of cathode terminal conductor, 62 . . . Hole in circuit board, 64 .
Circuit board, 66... Lateral portion of cathode terminal conductor;
68... Lateral portion of anode terminal conductor, 7°...
...Vertical portion of cathode terminal conductor, 72...
Relatively wide strip-shaped portion of anode terminal conductor, 74.
...Vertical portion of anode terminal conductor, 78...
- Elastically deformed end of the anode terminal conductor, 80...
... Hole in circuit board, 84 ... Notch formed in relatively wide strip-shaped portion of anode terminal conductor, 86
．． 88... Conductor of circuit board, 90, 92...
...Solder connection.

Claims (1)

[Claims for Utility Model Registration] An anode comprising a film-forming metal and a derivative oxide film on the metal, a semiconductive electrolyte layer on the film, a conductive cathode layer on the electrolyte layer, and the anode. a lead-out conductor 20 connected to the anode, a resin jacket 50 covering the anode, electrolyte layer and cathode layer, and a pair of spaced apart terminal conductors 30.4 extending in the same direction.
0, each terminal conductor 30, 40 is formed from a thin sheet of solderable elastic metal, one of the pair of terminal conductors being a cathode terminal conductor 40, and each terminal conductor 30, 40 having a strip-shaped portion 6.
0 and a vertical portion 70 soldered to the cathode layer, most of the vertical portion 70 is embedded in the resin of the outer sheath 50, and the pair of terminal conductors The other is the anode terminal conductor 30,
The anode terminal conductor 30 includes a strip-shaped portion 72, a longitudinal portion 74 substantially embedded in the resin of the jacket 50, and a lateral portion 76 welded to the anode lead-out rod 20.
The horizontal portion 76 and the lead-out rod 20 are embedded in the resin of the outer cover 50, and each of the pair of terminal conductors 30.40 is vertically connected to the strip-shaped portion 72.60. intermediate lateral portions 68, 66 substantially coplanar between directional portions 74, 70;
one of said strip-like portions 72 being substantially wider than the other strip-like portion 60, said substantially wider strip-like portion 72 being resilient at a predetermined distance from said intermediate transverse portion 68; is pre-shaped to provide an integral end 78 that can be deformed;
the end 78 is wider than the width of the first hole 80 in the circuit board 64 of predetermined dimensions;
a middle lateral portion 68.66 of each of said terminal conductors 30.40 is in contact with said circuit board 64 and said substantially wide A preformed end 78 of the wide strip-like portion 72 is elastically deformed into engagement with the first hole 80 of the circuit board 64 and The second hole 62 is connected to the other strip-shaped portion 6.
A resin-coated solid electrolytic capacitor characterized in that the capacitor is slightly larger than 0 and surrounds the other strip-shaped portion 60.