JPH08203776A - Capacitor - Google Patents

Abstract

PURPOSE: To improve quality by preventing breakage, etc., of armor resin and by preventing humidity from entering a capacitor element by coating and painting an extraction electrode. CONSTITUTION: Coating tubes 16, 17 mounted adjacent to electrodes 12, 13 of extraction electrodes 14, 15 and thermal contraction tubes 18, 19 mounted at a side of the electrodes 12, 13 of the coating tubes 16, 17 are provided, and armor resin 20 is formed to cover a capacitor element 11 and the electrodes 12, 13 from a mounting part of the coating tubes 16, 17 and the thermal contraction tubes 18, 19.

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 A conventional plastic film capacitor is shown in FIGS. FIG. 7 is a perspective view showing the plastic film capacitor before the painting process. Reference numeral 1 is a capacitor element formed by winding a thin plastic film that accumulates electric charges. This capacitor element 1
The electrodes 2 and 3 are fixed to the side surfaces of the. Both electrodes of the capacitor element 1 are electrically connected to the electrodes 2 and 3, respectively.

Lead-out electrodes 4, 5 made of cp wire (copper plated copper wire) or NL wire (copper solder plated wire) are connected to the electrodes 2, 3 by soldering. FIG.
FIG. 9 is a perspective view showing the plastic film capacitor after finishing the painting process, and FIG. 9 is a sectional view showing the plastic film capacitor after finishing the painting process.

For the plastic film capacitor assembled as shown in FIG. 7, the capacitor element 1 is used.
And the electrodes 2 and 3 as a whole while covering the electrodes 2 and 3.
3 is coated with a liquid or powder made of an insulating resin material so as to cover the connecting portions of the extraction electrodes 4 and 5 with each other, and the exterior resin 6 is formed by this coating to complete the product.

[0005]

When a conventional plastic film capacitor is attached to a device and a mechanical shock or a load (stress) is applied to the extraction electrodes 4 and 5, the exterior of the base of the extraction electrodes 4 and 5 is applied. There is a problem that the resin 6 may be damaged.

Further, since the extraction electrodes 4 and 5 are in direct contact with the exterior resin 6, depending on the use environment, moisture may enter the capacitor element 1 from the contact portion between the extraction electrodes 4 and 5 and the exterior resin 6. However, there was a problem of causing a failure.

Therefore, according to the present invention, by coating and coating the extraction electrode, it is possible to prevent damage to the exterior resin and prevent moisture from entering the capacitor element, and to improve quality. The purpose is to provide.

[0008]

According to the present invention, there are provided a capacitor element for accumulating charges, electrode plates respectively connected to both electrodes of the capacitor element, and an extraction electrode electrically connected to each electrode plate, A coating tube formed of an insulating material that covers the vicinity of the electrical connection portion of each extraction electrode with the electrode plate, and a heat-shrinkable tube that covers a predetermined length from the electrode plate side tip of each coating tube. , The capacitor element, the electrode plate, the connection part of the extraction electrode with the electrode plate and its vicinity, and the end part of the heat-shrink tube on the electrode plate side and its vicinity from the end part of the coating tube on the connection part side of the extraction electrode and the electrode plate An insulating coating layer is provided.

[0009]

In the present invention having such a structure, the heat-shrinkable tube causes heat-shrinkage due to the heat generated by the formation of the insulating coating layer in the manufacture, and the covering tube and the extraction electrode are brought into close contact with each other.

Since the base of the extraction electrode is in contact with the insulating coating layer via the coating tube and the heat shrinkable tube, the impact or stress applied to the extraction electrode does not act on the insulating coating layer but acts on the coating tube. And then absorbed.

Further, since the insulating coating layer and the heat-shrinkable tube, the heat-shrinkable tube and the coating tube, and the coating tube and the extraction electrode are in close contact with each other, dust or moisture may cause the extraction electrode to come into contact. There is no danger of being transmitted and entering the inside of the insulating coating layer.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 to 3 are perspective views showing each assembling process of a plastic film capacitor to which the present invention is applied before a coating process.

FIG. 1 is a perspective view showing a conventional assembling step of a plastic film capacitor. 11 is
A capacitor element formed by winding a thin plastic film that accumulates electric charges. Electrodes 12 and 13 as electrode plates are fixed to the side surfaces of the capacitor element 11. Both electrodes of the capacitor element 11 are electrically connected to the electrodes 12 and 13, respectively.

Lead-out electrodes 14 and 15 are connected to the electrodes 12 and 13 by soldering, which are cp wires (copper-plated copper-plated wires) and NL wires (copper solder-plated wires). FIG. 2 is a perspective view showing a stage where a covering tube is attached as a stage of assembling a plastic film capacitor.

The coating tubes 16 and 17 are connected to the extraction electrodes 14,
Pass through 15. At this time, the position where the coating tubes 16 and 17 are mounted is set to a position where a slight gap is formed between the tip of the coating tube 16 and the electrodes 12 and 13.

As a method of omitting the step of attaching the covering tube, if the lead wire or the like on which the covering tube is already attached is used, the above two assembling steps can be completed in one step.

FIG. 3 is a perspective view showing a step of mounting a heat shrink tube as an assembly step of a plastic film capacitor. The heat-shrinkable tubes 18 and 19 are passed through the extraction electrodes 14 and 15 and the coating tubes 16 and 17. At this time, as shown in FIG. 4, the heat-shrinkable tube is attached to the tip of the heat-shrinkable tube,
The position is set such that a portion having a predetermined length A from the tip of 17 remains exposed.

FIG. 5 is a perspective view showing the plastic film capacitor after the painting process is completed, and FIG. 6 is a sectional view showing the plastic film capacitor after the painting process is completed.

For the plastic film capacitor assembled as shown in FIG. 4, the capacitor element 1 is used.
1 and the whole of the electrodes 12 and 13, and a connecting portion between the electrodes 12 and 13 and the extraction electrodes 14 and 15,
A coating with a liquid or powder made of an insulating resin material is performed so as to cover the tip portions of the coating tubes 16 and 17 and the entire heat shrinking tubes 18 and 19, and by this coating, an exterior resin as an insulating coating layer. 20 is formed and completed as a product (plastic film capacitor).

In this embodiment having such a structure, the heat shrinkable tubes 18 and 19 are heat shrunk in the manufacturing process, that is, in the coating process. These heat shrinkable tubes 18, 19
Due to the heat shrinkage of the coating tubes 16 and 17, the extraction electrodes 1
It comes in close contact with 4, 15.

When impact and stress are applied to the extraction electrodes 14 and 15, this impact and stress are applied.
6 and 17, and is hardly propagated to the exterior resin 20.

In the tensile force test of the extraction electrode in which the exterior resin is damaged, the conventional electrode type shown in FIGS. 8 and 9 has a weight of 1.1 to 1.3 kgf. With the attached type, 1.9 ~
2.2 kgf, and in the type of this embodiment (coated tube and heat-shrinkable tube) 2.4-2.8 k.
The result of gf is obtained, and it is clear that the impact and stress on the extraction electrode are absorbed by the coating tube and the heat-shrinkable tube as compared with the conventional case.

As described above, according to this embodiment, the extraction electrode 1
Coated tubes 16 and 17 mounted near the electrodes 12 and 13 of 4, 15 and electrodes 1 of the coated tubes 16 and 17, respectively.
The heat shrinkable tubes 18 and 19 mounted on the side 2 and 13 are provided, and the coated tubes 16 and 17 and the heat shrinkable tubes 18 and
From the mounting portion of 19 to the capacitor element 11 and the electrodes 12, 1
By forming the exterior resin 20 so as to cover 3, the exterior resin 20 has high adhesion to the coating tubes 16 and 17 and the heat shrinkable tubes 18 and 19, and the exterior resin is covered with the coating tubes 16 and 17 and the heat shrinkable tubes. The length of the electrodes 12 and 13 which are in close contact with the electrodes 18 and 19 can be increased. Therefore, it is possible to prevent the exterior resin 20 from being damaged or cracked, prevent moisture from entering the capacitor element 11, and improve the quality.

[0024]

As described above in detail, according to the present invention,
By coating and coating the extraction electrode, it is possible to provide a capacitor capable of preventing damage to the exterior resin and the like and preventing moisture from entering the capacitor element, and improving quality.

[Brief description of drawings]

FIG. 1 is a perspective view showing the same stage as in the conventional assembly of a plastic film capacitor according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a stage in which a coated tube is attached in assembling the plastic film capacitor of the embodiment.

FIG. 3 is a perspective view showing a stage in which a heat-shrinkable tube is mounted in the assembly of the plastic film capacitor of the embodiment.

FIG. 4 is an enlarged view of the base of the extraction electrode at the stage when the heat-shrinkable tube is mounted in the assembly of the plastic film capacitor of the embodiment.

FIG. 5 is a perspective view showing the plastic film capacitor after the completion of the coating process of the embodiment.

FIG. 6 is a cross-sectional view showing the plastic film capacitor after completion of the coating process of the same example.

FIG. 7 is a perspective view showing a conventional plastic film capacitor before a coating process.

FIG. 8 is a perspective view showing a plastic film capacitor after completion of a coating process of the conventional example.

FIG. 9 is a cross-sectional view showing the plastic film capacitor after completion of the coating process of the conventional example.

[Explanation of symbols]

 11 ... Capacitor element, 12, 13 ... Electrode, 14, 15 ... Extraction electrode, 16, 17 ... Coated tube, 18, 19 ... Heat shrinkable tube, 20 ... Exterior resin.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location H01G 4/18 7924-5E H01G 4/24 301 K

Claims (1)

[Claims] 1. A capacitor element for accumulating charges, and electrode plates connected to both electrodes of the capacitor element, respectively.
Extraction electrodes electrically connected to each electrode plate, a coating tube formed from an insulating material that covers the vicinity of the electrical connection point of each extraction electrode to the electrode plate, and the coating tube of each coating tube A heat-shrinkable tube that covers a predetermined length from the electrode plate side tip, the capacitor element, the electrode plate, a connection portion between the electrode plate of the extraction electrode and the vicinity thereof, the extraction electrode of the coating tube and the A capacitor provided with an insulating coating layer covering a tip of the heat-shrinkable tube on the side of the electrode plate and the vicinity thereof from the tip on the side of connection with the electrode plate.