JPS6127165Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a capacitor having an improved electrode configuration using a metallized film or metalized paper having a structure in which electrodes at the same potential are in contact with each other.

In general, a capacitor having a structure in which electrodes at the same potential are in contact with each other is constructed by providing a pair of vapor-deposited electrodes on both sides of a dielectric sheet of film or paper, overlapping the electrodes in a pair, and providing a metallicon layer on the end surface of the wound sheet. However, the vapor deposited electrode structure of a capacitor constructed in this manner has conventionally been made of zinc alone or aluminum alone. For example, when zinc is used alone, the current intensity is relatively high and the rate of change in capacity is small, but the heating method is poor and the insulation properties are poor. In the case of using aluminum alone, the healing method is good and the insulation properties are good, but there is a problem with the current intensity and at the same time, the capacitance change rate increases over time.

The present invention was developed in view of the above points, and uses a pair of dielectric sheets with one side of the dielectric sheet as a zinc evaporation electrode and the other side as an aluminum evaporation electrode, so that the zinc evaporation electrode and the aluminum evaporation electrode have the same potential. In this case, the membrane resistance of the zinc-deposited electrode is 1.
~5Ω/□ and further increase the composite membrane resistance to 3~10Ω/□
The object of the present invention is to provide a capacitor with good characteristics that eliminates the drawbacks of the conventional method by bonding the metallicon layer only with the wound zinc evaporated electrode portion.

An embodiment of the present invention will be described below with reference to the drawings. That is, as shown in FIG. 1, a zinc evaporated electrode 2 is formed on one end of one side of a film or paper dielectric sheet, leaving a margin part 1 in the length direction, and a margin part 1 is formed on the other side on the opposite side of the margin part 1. Part 3
It consists of a pair of double-sided metallized dielectric sheets 5 formed by leaving an aluminum evaporated electrode 4, and at the same time when the zinc evaporated electrode 2 and the aluminum evaporated electrode 4 are brought into contact, the end surfaces of the zinc evaporated electrodes 2 are respectively exposed to the outside. The wound capacitor element 6 is constructed by superimposing the wound capacitor elements 6 and 6 on each other. Thus, the metallicon layer 7 is bonded to two parts of the zinc-deposited electrodes protruding from both end faces of the capacitor element 6. In this case, the membrane resistance of the zinc evaporated electrode 2 is 1Ω/□~5Ω/□, and the combined membrane resistance of the zinc evaporated electrode 2 and the aluminum evaporated electrode 4 is 3Ω/□~10.
It is important to set it to Ω/□.

Next, a more detailed explanation will be given based on an embodiment of the present inventor. That is, first, we created a 6 μF polyethylene terephthalate film capacitor with different film resistances for the vapor deposited electrode structure of the part that adheres to the metallicon layer, one made of zinc metal and the other made of aluminum metal, and then produced a 400V capacitor.
tan vs. membrane resistance (Ω/□) after 100 charge/discharge cycles
The results of investigating δ (%) are shown in Figure 2, and it is found that the structure of the evaporated electrode in the part that adheres to the metallicon layer is a zinc evaporated electrode, and a stable tan δ is shown when the film resistance is 1 to 5 Ω/□. Ta. Next, we will discuss the point found in the above experiment, that is, assuming that the membrane resistance of the zinc evaporated electrode is 1 to 5 Ω/□, we measured the withstand voltage characteristics against the combined resistance value (Ω/□) with the aluminum evaporated electrode, as shown in Figure 3. It was found that the optimum range of breakdown voltage characteristics is a composite membrane resistance of 3 to 10 Ω/□. Therefore, based on the evaporated electrode structure and membrane resistance that have been clarified through the above experiments, we have proposed the present invention A shown in FIG. 1, a conventional reference example B using a zinc evaporation electrode alone, and a conventional reference example using an aluminum evaporation electrode alone. Figure 4 shows the rate of capacitance change over time for each of C under the conditions of 70° C. and 320 V.AC applied. For samples A, B, and C, 6μF capacitors made of 6μ polyethylene terephthalate film were used. As is clear from Figure 4, in Reference Example C, the capacity decrease increases with the passage of time, whereas in Inventive A and Reference Example B, the capacity decrease is less than 1% even after 1000 hours, and the capacity change rate is It has been shown to have excellent properties. Next, using capacitors of the same rating obtained under the same conditions, the relationship between voltage and insulation resistance was investigated, and the results were as shown in FIG. As is clear from FIG. 5, compared to Reference Example B, the present invention A and Reference Example C exhibited superior insulation resistance characteristics. From the above experimental results, only the present invention A exhibits excellent effects in both capacitance change rate and insulation resistance characteristics, and reference example B exhibits the same characteristics as present invention A in terms of capacitance change rate characteristics but is insulated. It was found that the resistance characteristics were not as good as the present invention A, and even though the reference example C exhibited the same characteristics as the present invention A in insulation resistance characteristics, it was not as good as the present invention A in the capacitance change rate. From the above experimental results, the best effect on tan δ characteristics, insulation resistance characteristics, and capacitance change rate characteristics is achieved by using a capacitor electrode configuration in which electrodes at the same potential are in contact with each other, with one electrode at 1 to 5 Ω/□. The edge vapor-deposited electrode and the other electrode are aluminum vapor-deposited electrodes, and the combined resistance of both electrodes is 3.
It has been found that it is sufficient to set the resistance to ~10Ω/□ so that only the sub-edge vapor deposited electrode portion is bonded to the metallikon layer.

As described above, according to the present invention, in a capacitor using a dielectric sheet such as a metallized film or metallized paper, which has a structure in which electrodes at the same potential are in contact with each other, the tanδ characteristics, insulation resistance characteristics, and capacitance change rate characteristics Therefore, it is possible to provide an excellent capacitor with high quality, and its industrial effects are great.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a capacitor according to the present invention, Fig. 2 is a membrane resistance-tanδ characteristic curve, Fig. 3 is a composite membrane resistance-withstanding voltage characteristic curve, and Fig. 4 is a time-voltage characteristic curve.
FIG. 5 is a capacitance change rate characteristic curve diagram, and FIG. 5 is a voltage-insulation resistance characteristic curve diagram. 2...Sub-rim evaporation electrode, 4...Aluminum evaporation electrode,
5... Double-sided metallized dielectric sheet, 7... Metallicon layer.

Claims (1)

[Scope of utility model registration request] In a capacitor using a double-sided metallized dielectric sheet with a structure in which electrodes at the same potential are in contact with each other, one electrode is a zinc evaporated electrode with a membrane resistance of 1 to 5 Ω/□, the other is an aluminum evaporated electrode, and both electrodes are A capacitor characterized by having a composite membrane resistance of 3 to 10 Ω/□ and at the same time having a metallicon layer bonded only to the zinc-deposited electrode portion.