JPH09134847A - Capacitor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a terminal electrically connected and fixed to a metallikon by spot welding from varying in fixing angle and to improve a capacitor in connecting workability by a method wherein the leading terminal is set proper in connecting position to a metallikon and held by position retaining parts. SOLUTION: A capacitive device 13 where metallikons 14 and 15 are formed as leading electrodes on its edge faces and terminals 11 and 12 are so arranged and held by a holding jig as to be formed into a finished plastic film capacitor of prescribed shape, and the welding parts of the terminals 11 and 12 are electrically connected and fixed to the metallikons 14 and 15 by spot welding. At this point, the welding parts of the terminals 11 and 12 are deformed by a welding pressure applied at spot welding and fixed to the metallikon 14 and 15, and two attachde retainers 5 and 6 provided in each of the terminals 11 and 12 are made to bear against the metallikon 14 and 15 without being affected by the heat and welding pressure of spot welding and held by the holding jig in position (position as plastic film capacitor).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a capacitor such as a plastic film capacitor for accumulating charges used in electronic circuits and the like.

[0002]

2. Description of the Related Art FIG. 7 is a perspective view including a partial cross section showing a conventional plastic film capacitor. The plastic film capacitor 101 is manufactured as described below. As shown in FIG. 8 (b), first, metallikons 103 and 104 forming electrodes are formed on both end faces of the capacitor element 102 wound with a thin film plastic film for accumulating charges. Terminals (lead-out electrodes) 105 and 106 shown in FIG. 8A are electrically connected and fixed to each of the metallikons 103 and 104 by soldering or spot welding. Terminal 105 (106
) Indicates a tip connecting portion 105-1 having a through hole through which a lead wire or the like is electrically connected by soldering, a supporting portion 105-2 supporting the tip connecting portion 105-1, and a metallikon 103. It is composed of a projection-shaped end connecting portion 105-3 which is electrically connected and fixed.

Next, metallikons 103 and 104 are formed on the capacitor element 102, and terminals 105 and 106 are connected.
A fixed product (hereinafter referred to as a pre-insulation molded product) is housed in a box-shaped insulation case 107 having an open top, and the tip connection portions of the terminals 105 and 106 of the pre-insulation molded product are housed therein. Insulating resin material (
The epoxy resin is filled in to form the insulating mold portion 108, and the finished product as shown in FIG. 7 is obtained. Although not shown here, the exterior resin is directly applied to form an insulating layer so that the insulating resin material covers all of the terminals of the pre-insulation-molded product excluding the tip connection part, and the completion. There are some that will be sold.

By the way, as a method of connecting and fixing the terminals 105 and 106 to the metallikons 103 and 104, for example, the capacitor element 102 having the metallikons 103 and 104 formed thereon and the terminals 105 and 106 are held by a predetermined jig. Then, the terminal connection portions of the terminals 105 and 106 are brought into contact with predetermined positions of the metallikons 103 and 104, respectively.
In this state, they are electrically connected and fixed by soldering or spot welding.

In the case of soldering, it takes time, and the heat of the solder causes the capacitor element (thin film plastic film
) 102 to cause deterioration of electrical characteristics as a capacitor. In the case of spot welding,
End connections of terminals 105 and 106 and metallikon 103,
The welding state with 104 is determined by the drive current, the waveform of this drive current, and the pressurizing pressure as the fluctuation factors, and the amount of heat conducted to the capacitor element 102 can be reduced in a short period of time, and the deterioration of characteristics can be prevented. Has an advantage. On the other hand, due to the pressure applied, the terminals 105, 10
The terminal connection portion of 6 is pushed into the metallikons 103 and 104 to be deformed (distorted), and the terminals 105 and 10 corresponding to the metallikons 103 and 104 formed in the capacitor element 102.
The fixed angle of 6 is tilted, and the position and direction of the tip connection part is displaced.

[0006]

As described above, the metallikon 10 of the terminals 105 and 106 by spot welding is used.
In the connection to 3, 104, there is a problem that the fixed angle of the terminals 105, 106 with respect to the metallikons 103, 104 is tilted, the position and direction of the tip connection parts are displaced, and the pitch between the tip connection parts is different for each plastic film capacitor. there were. If the position / direction of the tip connection part shifts, for example,
When incorporating the plastic film capacitors 101 into many devices of the same type, the length of the lead wire connecting the plastic film capacitors 101 and the circuit board must be adjusted for each plastic film capacitor 101 according to the actual product. In addition, since the lead wire cannot be standardized and stocked as a component in advance, there is a problem that the connection workability in using the plastic film capacitor 101 is poor. Further, when using a connector that can be attached and detached with one touch at the tip connection portion of the terminal, even if it is desired to attach and detach the plastic film capacitor 101 by integrating the two connectors with one touch, the pitch between the tip connection portions (terminal If the inter-pitch is different for each plastic film capacitor, such a connector cannot be used and the connection workability is poor.

Therefore, the present invention provides a capacitor which can prevent inclination of a fixing angle of a terminal which is electrically connected and fixed to a metallikon by spot welding and which can improve workability of connection of the capacitor. The purpose is to do.

[0008]

The invention corresponding to claim 1 is:
A capacitor element for accumulating charges, a metallikon formed on both electrodes of the capacitor element, an extraction electrode connected to each of the metallikons by welding, a capacitor element, a metallikon, a connecting portion between the metallikon and the extraction electrode, and An insulating part covering the vicinity thereof is provided, and the extraction electrode is a welded part connected to the metallikon by welding,
An attitude holding unit for forming and holding a connection attitude of the extraction electrode with respect to the metallikon.

Thus, even if the welded portion is spot-welded and deformed, the posture maintaining portion maintains the connection posture of the extraction electrode with respect to the metallikon. In the invention according to claim 2, in the invention according to claim 1, the attitude holding portion of the extraction electrode is formed in a projection shape that comes into contact with the metallikon.

According to a third aspect of the invention, in the first aspect of the invention, the attitude holding portion of the extraction electrode is formed in a plurality of projection shapes that are in contact with the metallikon. In the invention according to claim 4, in the invention according to claim 1, the attitude holding portion of the extraction electrode has a ring shape.

According to a fifth aspect of the invention, in the invention according to the first aspect, the attitude holding portion of the extraction electrode has a ring shape surrounding the welded portion. The invention according to claim 6 is the invention according to claim 1, wherein the leading end of the welding portion of the extraction electrode is connected to the posture holding portion. The invention corresponding to claim 7 is
In the invention corresponding to claim 1, the welding portion of the extraction electrode has a shape closer to the metallikon side than the posture holding portion.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a terminal 1 as a lead electrode used in a plastic film capacitor to which the present invention is applied. This terminal 1 is provided with a tip connecting portion 2 having a through hole to which a lead wire or the like is electrically connected by soldering (or may be fixed by winding), or one-touch detachably connected by a connector. A support part 3 for supporting the tip connection part 2, a welded part 4 in the shape of a protrusion that is electrically connected and fixed to a metallikon to be described later, and the welded part 4 is provided on both sides of the welded part 4 in parallel with each other at predetermined intervals, It is composed of two protrusion-shaped posture holding portions 5 and 6 which are formed longer than the portion 4.

As shown in FIG. 2, the welded portions of the terminals 11 and 12 having such a structure are spot-welded to the metallikons 14 and 15 formed on both end surfaces of the capacitor element 13 wound with a thin film plastic film, respectively. It is electrically connected and fixed by. In addition, the attitude holding portions 5 and 6 of the terminals 11 and 12 are connected to the metallikons 14 and 15 respectively.
It was just spotted and not spot welded.

In this way, the capacitor element 13
The metallikons 14 and 15 are formed on the
As shown in FIG. 3, the one to which 2 is connected and fixed (hereinafter referred to as the pre-insulation molded product) is housed in a box-shaped insulation case 21 having an open top, and the pre-insulation molded product is placed in the box-shaped insulation case 21. An insulating resin material (epoxy resin) is filled to form an insulating mold portion 22 so that all the portions of the product except the tip connection portions of the terminals 11 and 12 are filled, and the plastic film capacitor 23 is completed. Alternatively, as shown in FIG. 4, by using powder (or liquid) of insulating resin (epoxy resin), the terminals 11,
To cover all parts except the tip connection part of 12,
The outer coating is directly applied to form the insulating layer 24, and the plastic film capacitor 25 is completed.

5 and 6 are perspective views showing another example of the terminals 11 and 12. As shown in FIG. Terminal 31 shown in FIG. 5 (a).
Is a protrusion-shaped welded portion 33 formed in a posture-retaining portion 32 formed in a ring shape. The terminal 34 shown in FIG. 5 (b) is arranged so as to be hung in the posture holding portion 35 formed in a ring shape, that is, the tip of the protrusion-shaped welding portion 33 in FIG. 5 (a) is formed into a ring shape. A welding portion 36 is formed so as to be connected to the posture holding portion 32.

The terminal 37 shown in FIG. 5 (c) is like the terminal 1 shown in FIG.
9 is formed with a protrusion-shaped weld 40, and a step is formed so as to bend inward so that the weld 40 is located closer to the metallikon than the positions of the posture holding portions 38 and 39. It is a thing.

The welded portion 43 of the terminal 41 (42) shown in FIG.
In all the above examples, the tip direction of the tip connection part (longitudinal direction
) In the vertical direction, the welds 4, 33, 36,
Whereas 40 is formed in a protrusion shape with the longitudinal direction as the longitudinal direction, it is formed in a protrusion shape with the lateral direction as the longitudinal direction. A U-shape is formed by the support portion 47 and the posture holding portion 48 so as to sandwich the welding portion 43 in the vertical direction.

In this embodiment having such a structure, the capacitor element 13 having the metallikons 14 and 15 formed on both end faces thereof and the terminals 11 and 12 are predetermined by a holding jig as a finished plastic film capacitor. The welded portions of the terminals 11 and 12 are spot-welded, respectively, so that the metallikons 14 and 1 are held.
5 is electrically connected and fixed. At this time, the welded portion is deformed by the applied pressure of the spot welding and the metallikons 14, 15
However, each of the two attitude holding portions of the terminals 11 and 12 does not receive heat and pressure of spot welding,
It abuts the metallikons 14 and 15 and holds the posture held by the holding jig. That is, the terminals 11 and 12 as a whole hold the posture of the finished plastic film capacitor held by the holding jig for the capacitor element 13.

The terminals 11 and 12 are connected to the capacitor element 13 in which the metallikons 14 and 15 are thus formed.
Store the fixed molded product before insulation treatment in the case 21,
By filling the insulating resin material to form the insulating mold portion 22, as shown in FIG. 3, the plastic film capacitor 23 in which the terminals 11 and 12 are arranged at the correct positions and at the correct pitches is completed. If the molded product before insulation treatment is directly coated with an insulating resin powder (or liquid) to form the insulating layer 24, as shown in FIG. 4, the terminals 11 and 12 are accurately positioned at accurate positions. The plastic film capacitors 25 arranged with a pitch are completed.

Further, the welding portion and the posture holding portion of the terminal are
As shown in FIG. 5 (a), the posture holding section 32 is connected to the welding section 33.
By forming a ring shape that surrounds
As shown in FIG. 3, the posture holding portion 35 is formed in a ring shape, and the welded portion 36 is formed in the ring of the posture holding portion 35 so that its tip is connected to the posture holding portion 35. As shown in FIG. 5 (c), by forming a step (pre-deformation) protruding toward the metallikon side in the welded portion 40 to reduce deformation due to spot welding, and by forming as shown in FIG. Further, the posture holding force of the terminals is further improved, and in the plastic film capacitor, the terminals are arranged at more accurate positions and with more accurate pitch.

As described above, according to this embodiment, the welded portions 4, 33, 36, 40, 43 to be spot welded to the terminals 1, 11, 12, 31, 34, 37, 41, 42 and the spot welded. Posture holding parts 5, 6, 32, 35, 38, 39, 48 that abut the metallikons 14, 15
By providing the metallikons 14, 15, 45, 4
It is possible to prevent the fixing angle of the terminal from tilting when electrically connecting and fixing to 6 by spot welding. Therefore, the positions of the terminals and the pitches between the terminals of the plastic film capacitors 23 and 25 are accurate, and the workability of connecting the plastic film capacitors 23 and 25 (the work efficiency of assembling) can be improved.

In this embodiment, as shown in FIG.
2, 5 and 6 have been described with reference to various examples of the shape of the terminal, the present invention is not limited to this, and the shape can be changed without departing from the gist of the present invention. Various modifications are possible.

[0023]

As described in detail above, according to the present invention,
It is possible to provide a capacitor that can prevent inclination of a fixing angle of a terminal that is electrically connected and fixed to a metallikon by spot welding, and can improve workability of connecting the capacitor.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a terminal used in a plastic film capacitor according to an embodiment of the present invention.

FIG. 2 is a capacitor element, a metallikon of the same embodiment,
The perspective view which shows the molded product before an insulation process comprised from the terminal.

FIG. 3 is a perspective view showing a plastic film capacitor (completed product) with a case according to the same embodiment.

FIG. 4 is a perspective view showing a plastic film capacitor (finished product) subjected to exterior coating processing according to the same embodiment.

FIG. 5 is a perspective view showing another three examples of terminals used in the plastic film capacitor of the same embodiment.

FIG. 6 is a perspective view showing another example of a terminal used in the plastic film capacitor of the same embodiment.

FIG. 7 is a perspective view including a partial cross section showing a conventional plastic film capacitor (completed product).

FIG. 8 is a perspective view showing a capacitor element having terminals and metallikons used in a conventional plastic film capacitor.

[Explanation of symbols]

1, 11, 12, 31, 34, 37, 41, 42 ... Terminal, 2 ... Tip connection part, 3, 47 ... Support part, 14, 15, 45, 46 ... Metallicon, 4, 33, 36, 40, 43 ... Welded part, 5, 6, 32, 35, 38, 39, 48 ... Posture holding part.

Claims (7)

[Claims] 1. A capacitor element for accumulating charges, metallikons formed on both electrodes of the capacitor element, extraction electrodes respectively connected to the metallikons by welding, the capacitor element, the metallikon, and the metallikon. An insulating portion covering a connection portion with the extraction electrode and its vicinity is provided, and the extraction electrode forms and holds a welded portion connected to the metallikon by welding and a connection attitude of the extraction electrode with respect to the metallikon. And a posture holding unit for holding the posture. 2. The capacitor according to claim 1, wherein the attitude holding portion of the extraction electrode is formed in a projection shape that is in contact with the metallikon. 3. The capacitor according to claim 1, wherein the attitude holding portion of the extraction electrode is formed in a shape of a plurality of protrusions that come into contact with the metallikon. 4. The capacitor according to claim 1, wherein the attitude holding portion of the extraction electrode has a ring shape. 5. The capacitor according to claim 1, wherein the attitude holding portion of the extraction electrode has a ring shape surrounding the welded portion. 6. The capacitor according to claim 5, wherein the leading end of the welded portion of the extraction electrode is connected to the posture holding portion. 7. The capacitor according to claim 1, wherein the welding portion of the extraction electrode has a shape closer to the metallikon side than the posture holding portion.