JP2000294450A - Manufacture of laminated metallized film capacitor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a method of manufacturing a laminated metallized film capacitor effectively preventing an excessive gap from being generated between an electrode film and a dielectric film. SOLUTION: A laminated metallized film capacitor is manufactured through a manner where a single-sided metallized films 10 (10A and 10B) are laminated to serve as a capacitor element, an electrode is provided to each end of the capacitor element, and electrode films 14 (14a ands 14b) are alternately connected to different outer electrodes respectively. When the single-sided metallized films 10 are laminated, a following process is repeatedly carried out, and the process is that the metallized film 10A is placed on a metal plate 22 that is grounded, the top surface of the metallized film 10A is irradiated with positive ions so as to be charged with positive static electricity, the other metallized film B is overlapped on the charged surface of the metallized film 10A, and the dielectric film 12A of the single-sided metallized film 10A, and the electrode film 14B of the other single-sided metallized film 10B are brought into close contact with each other taking advantage of static electricity.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0101]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metallized film capacitor, and more particularly to a laminated metallized film capacitor formed by laminating a large number of single-sided metallized films each having an electrode film formed on one surface of a dielectric film. The present invention relates to a manufacturing method and a method for manufacturing a laminated metallized film capacitor formed by alternately laminating a large number of double-sided metallized films in which electrode films are formed on both surfaces of a dielectric film and dielectric films.

[0092]

2. Description of the Related Art As shown in FIGS. 16 and 17, a conventional metallized film capacitor 80 comprises a dielectric film 81 made of polypropylene, polyethylene, polyimide, or the like, and an electrode film 82 made of aluminum, zinc, or the like, respectively.
After laminating the metallized film 84 applied with a thickness of 10 nm to 80 nm, wound by a winder to secure the end,
This is subjected to heat and pressure treatment to form a capacitor element 86, and a metal material is sprayed on both end surfaces of the capacitor element 86 to form external electrodes (metallicon electrodes) 88 for connecting lead terminals.
a, 88b. On the surface of the dielectric film 81, a margin portion 90 (that is, a portion that is not covered by the electrode film 82) is secured with a predetermined width along one side.
A similar margin 90 is also provided on the surface of the other dielectric film 81 along the side opposite to the above.

Inside the wound metallized film capacitor 80, each electrode film 82
Are arranged so as to overlap each other. One end of each of the laminated electrode films 82 is alternately connected to the left and right external electrodes 88a and 88b.

[0093]

By the way, in the case of the above-mentioned conventional metallized film capacitor 80, the dielectric film 81
Each electrode film 82 disposed on both surfaces of the electrode film 82 and functioning as a capacitor electrode is said to be densely connected because it is vapor-deposited on one of the dielectric films 81, but is simply connected to the other dielectric film 81. They are only in contact with each other, and as shown by the circular enlarged portion in FIG.
Exists. For this reason, not only a dielectric but also an extra space is interposed between the electrode films 82, 82 as a pair of capacitor electrodes, causing loss of capacitance and accumulation of electric charge due to variation in the spatial distance. Are not uniform, and so-called charge concentration is caused, so that the characteristics as a capacitor are unstable.

Of course, as described above, a pair of metallized films 84, 84 are laminated and wound, and then subjected to a heating and pressing step, so that one dielectric film 81 is connected to the other electrode film.
Efforts have been made to eliminate the gap 92 as much as possible by fusing it to the electrode 82, but by uniformly heating and pressing the entire capacitor element, the partial gap 92 between the electrode film 82 and the dielectric film 81 is uniform. Was difficult to eliminate. Also,
If the dielectric film 81 is made of a material having a relatively low melting point such as polyethylene or polypropylene, this thermocompression bonding step can also achieve a certain result, but when it is made of a high heat-resistant resin such as polyimide, Cannot use this method in the first place. For this reason, a special adhesive is applied between one dielectric film 81 and the other electrode film 82 at the time of winding, and after forming the capacitor element, the whole is heated to evaporate the solvent of the adhesive. Attempts have been made to bond between the electrode film 82 and the dielectric film 81. However, in this case, the adhesive applied near both ends of the capacitor element 86 solidifies first and plugs, so that the gasified solvent near the center does not escape to the outside, and rather the dielectric film 81 There is a danger that the gap between the electrode film 82 and the electrode film 82 will be expanded.

The present invention has been devised in order to solve the above-mentioned problems of the prior art, and an extra gap is produced between the electrode film of the metallized film capacitor and the dielectric film in the manufacturing process. It is intended to realize a method that can effectively prevent such a situation.

007

In order to achieve the above-mentioned object, a method of manufacturing a laminated metallized film capacitor according to the present invention comprises a plurality of metallized films each having an electrode film formed on one surface of a dielectric film. A laminated metallized film in which external electrodes are formed at both ends of the capacitor element by laminating the capacitor elements, and each of the electrode films facing each other with the dielectric film interposed therebetween is alternately connected to different external electrodes. A method of manufacturing a capacitor, when laminating each metallized film, by charging each metallized film and then superimposing, the dielectric film of each metallized film and the electrode film of the other metallized film and It is characterized by tightly joining the gaps using static electricity. For example, a step of placing one metallized film on a grounded conductive plate, irradiating the upper surface of the metallized film with ions, and then charging another metallized film thereon. Is repeated a required number of times.

Another method of manufacturing a laminated metallized film capacitor according to the present invention is directed to a method of manufacturing a laminated metallized film capacitor by alternately laminating a plurality of metallized films having dielectric films formed on both surfaces of a dielectric film and dielectric films. A method of manufacturing a laminated metallized film capacitor in which external electrodes are formed at both ends of the capacitor element and electrode films opposed to each other with a dielectric film interposed therebetween are alternately connected to different external electrodes. When laminating each metallized film and the dielectric film, each metallized film and the dielectric film are charged and then superimposed to form an electrode film and a dielectric film of each metallized film. It is characterized by tightly joining the gaps using static electricity. In this case as well, the step of placing one film on a grounded conductive plate, irradiating the upper surface of the film with ions, charging the film, and superimposing another film on the film is performed as many times as necessary. By repeating, a capacitor element in which the electrode film of the metallized film and the dielectric film are tightly joined is obtained.

As described above, in the manufacturing method according to the present invention, by forcibly charging each film,
The electrode film of the metallized film and the dielectric film can be tightly joined to each other by using the attraction of static electricity. In addition, when each film is laminated, such an electrostatic bonding process is repeated each time, so that unlike the conventional method in which each film is closely adhered after the capacitor element is formed, the film is uniformly adhered over the entire area inside the capacitor element. The state can be realized.

[0010] A large number of electrode films are formed on the metallized film in advance at predetermined intervals, and after laminating the films, the laminated body of the film is cut into metal film units to obtain a large number. Can be efficiently formed. In this case, after charging one developed film, the other wound film may be rolled on the charged surface and overlapped.

[0011]

FIG. 1 shows a single-sided metallized film 10 according to the present invention. A rectangular electrode film is formed on one surface of a sheet-like dielectric film 12 made of polypropylene, polyethylene, polyimide or the like. A large number 14 are arranged at predetermined intervals. Each electrode film 14 is a dielectric film
It is formed by evaporating a metal material such as aluminum or zinc on one surface of 12.

After laminating a large number of the single-sided metallized films 10, the laminated body is cut in units of each electrode film 14 along a dotted line in FIG. 16 is obtained. Each one side metallized film 10
The electrode films 14 are not arranged at the same position, but are shifted so that the left and right ends of the vertically stacked electrode films 14 alternately protrude. Therefore, when metal electrodes are sprayed on both end surfaces of the capacitor element 16 to form external electrodes (metallicone electrodes) 18a and 18b, one of the electrode films 14 is sandwiched with the dielectric film 12 interposed therebetween.
Is connected to the external electrode 18a, and the other electrode film 14 is connected to the external electrode 18b. Thus, the multilayer metallized film capacitor 20 is completed.

Incidentally, in order to prevent a gap from being formed between the electrode film 14 of the one-sided metallized film 10 and the dielectric film 12 of the other one-sided metallized film 10 in the capacitor 20, a sheet is required. When laminating the single-sided metallized fills 10 in a shape, it is effective to bring the sheets into close contact. For this reason, in the present invention, the electrostatic bonding process shown in FIGS. 3 to 8 is provided. First, the sheet-shaped single-sided metallized film 10A is placed on a metal plate 22 made of copper or the like with the electrode film forming surface facing down. Since the metal plate 22 is grounded, a certain degree of polarization occurs naturally, and a negative charge appears on the lower surface of the single-sided metallized film 10A and a positive charge appears on the upper surface. Next, toward the upper surface of the single-sided metallized film 10A, the ion generator 24
Irradiate with more positive ions. As a result, the dielectric film
The surface of 12A will be more positively charged,
The polarization action is emphasized.

In this state, as shown in FIG. 4, when the other one-sided metallized film 10B is brought close to the electrode film forming surface, the positively charged dielectric material is strongly charged on the electrode film forming surface. A negative charge appears under the influence of the film 12A. As shown in FIG.
When B is placed on the upper surface of the dielectric film 12A, the dielectric film 12A of the one-sided metallized film 10A and the electrode film 14B of the one-sided metallized film 10B are attracted to each other and are closely joined by Coulomb force.

Next, as shown in FIG. 6, after the upper surface of the single-sided metallized film 10B is irradiated with positive ions from the ion generator 24 to charge it with a positive charge, as shown in FIG. When the other one-sided metallized film 10C is brought closer, a negative charge appears on the lower surface side of the one-sided metallized film 10C due to the effect of the positive charge charged on the upper surface of the dielectric film 12B. FIG.
When the single-sided metallized film 10C is placed on the upper surface of the dielectric film 12B, the dielectric film 12B of the single-sided metallized film 10B and the single-sided
The C electrode film 14C is joined without any gap by the Coulomb force.

By repeating the above steps many times,
A large number of laminated single-sided metallized films 10, 10 are in close contact with each other. In addition, the positive ions irradiated from the ion generator 24 are applied to the dielectric films 12A to
In order to be distributed evenly on the surface of 12C, a large number of ion generators 24 are prepared, or the ion generators 24 or the metal plate 22 are moved.
What is necessary is just to constitute so that the surface of the dielectric films 12A-12C may be scanned by 24. In addition, each single-sided metallized film
In order to achieve accurate positioning when laminating 10,
A predetermined number of positioning pins are erected on the surface of the metal plate 22, and a through hole for positioning is formed in each single-sided metallized film 10, and this through hole is inserted through the positioning pin. It is desirable (not shown).

The ion generator 24 generates a corona discharge by applying an alternating high voltage between the discharge electrodes (between the needle electrode and the planar electrode) disposed opposite to each other, and generates positive ions generated by the air current. And a guide to the object to be irradiated.

As described above, since the ion generator 24 is configured to irradiate the upper surface of each single-sided metallized film 10 with positive ions, the distance between the electrode film 14 and the dielectric film 12 of each laminated single-sided metallized film is increased. Are relatively firmly joined by Coulomb force. For this reason, after this, even if cutting is performed for each electrode film 14 unit or a pressing step or an external electrode forming step is performed, the electrode film 14 of each single-sided metallized film can be cut.
And the dielectric film 12 are not easily separated. As shown in the circular enlarged portion of FIG. 2, in the completed laminated metallized film capacitor 20, the electrode film 14 of one single-sided metallized film 10 and the dielectric film 12 of the other single-sided metallized film 10 It is possible to effectively prevent a gap from occurring between them. Note that, as described above, a large number of sheet-shaped single-sided metallized films 10 are laminated, and after each of the electrode films 14 is cut into individual capacitor elements 16,
By applying a resin adhesive made of polyimide, silicon, or the like to the cut surface where the electrode film 14 is not exposed, the metallized films 10 that are densely stacked may be further firmly fixed.

In the above description, an example is shown in which a capacitor element 16 is formed by laminating a single-sided metallized film 10 having a large number of electrode films 14 formed on one surface of a sheet-shaped dielectric film 12. Even if a double-sided metallized film in which a large number of electrode films 14 are formed in a predetermined pattern on both surfaces of the dielectric film 12 and a sheet-like dielectric film 12 on which the electrode film 14 is not formed is alternately laminated, Similar capacitor element
You can get 16. Then, as shown in FIGS. 9 to 14, when the double-sided metallized film 26 and the dielectric film 12 are laminated, an electrostatic bonding process using Coulomb force is added to the double-sided metallized film 26. It is possible to increase the adhesion between each electrode film 14 and the dielectric film 12.

First, as shown in FIG. 9, a double-sided metallized film 26A is placed on the surface of a grounded metal plate 22. Each electrode film 14D formed on one surface of the double-sided metallized film 26A and each electrode film 14E formed on the other surface are shifted left and right with the dielectric film 12D interposed therebetween. Are located. This double-sided metallized film
When the upper surface of 26A is irradiated with positive ions from the ion generator 24, the upper surface side is strongly positively charged and a negative charge appears on the lower surface side. As shown in FIG. 10, when the dielectric film 12E is brought close to the upper surface of the double-sided metallized film 26A, a negative charge is applied to the lower surface side of the dielectric film 12E due to the positive charge charged on the upper surface of the double-sided metallized film 26A. Appears. When the dielectric film 12E is placed on the double-sided metallized film 26A as it is, the electrode film 14E of the double-sided metallized film 26A and the lower surface of the dielectric film 12E are
The joint is formed without any gap by the Coulomb force (FIG. 11).

Next, as shown in FIG. 12, the upper surface of the dielectric film 12E is irradiated with positive ions by the ion generator 24 to charge it with a positive charge. Then, as shown in FIG.
When the other double-sided metallized film 26B is brought closer to the upper surface of the dielectric film 12E, a negative charge appears on the lower surface side of the double-sided metallized film 26B due to the positive charge charged on the upper surface of the dielectric film 12E. As shown in FIG. 14, when the double-sided metallized film 26B is placed on the upper surface of the dielectric film 12E, the upper surface of the dielectric film 12E and the electrode film 14F on the lower surface of the double-sided metallized film 26B are separated by Coulomb force. It will be joined without.

The above steps are repeated as many times as necessary to laminate the double-sided metallized film 26 and the dielectric film 12 to a certain thickness, and then cut this sheet-like laminate into each electrode film 14 to obtain a diagram. A capacitor element 16 having the same configuration as that shown in FIG. 2 can be obtained. When laminating each double-sided metallized film 26 and the dielectric film 12, although not shown, a predetermined number of positioning pins are erected on the surface of the metal plate 22, and corresponding to each film. To provide a through hole for positioning
It is desirable to realize accurate positioning by inserting each through hole into a positioning pin.

Also in the case of the capacitor element 16, since the electrode films 14 and the dielectric film 12 are joined without any gap by Coulomb force, the external electrodes 18a, 18
b, the dielectric film 12 is interposed between the electrode films 14 when the multilayer metallized film capacitor 20 is completed.
Only the intervening portion, and the characteristics do not become unstable due to the existence of the extra gap.

In the above, an example has been shown in which, when the single-sided metallized films 10 or the double-sided metallized film 26 and the dielectric film 12 are laminated, the respective films are laminated and arranged in a state of being developed in a plane. However, the present invention is not necessarily limited to this. That is, as shown in FIG. 15, one film X (single-sided metallized film 1)
0, double-sided metallized film 26, or dielectric film 1
2) is placed on a grounded metal plate 22, and its upper surface is scanned by an ion generator 24 to be uniformly charged positively. Next, the other end of the wound film Y (single-sided metallized film 10, double-sided metallized film 26, or dielectric film 12) is fixed to the end of charged film X, and then fixed by an arrow. If you roll in the direction and spread,
Since a negative charge appears on the outer surface (lower surface) of the wound film Y and attracts the positive charge charged on the upper surface of the film X which is deployed and arranged, the close contact state between one film X and the other film Y is reduced. realizable.

According to this method, the positioning of the film X disposed on the lower side and the film Y superposed on the upper side is relatively easy, and if the positioning and fixing between the ends are accurately performed, the subsequent steps can be performed. Has the advantage that it is only necessary to roll and unfold the upper film Y. For this reason, it is possible to laminate relatively long films in a state of being closely bonded to each other, and it is possible to improve the production efficiency of the laminated metallized film capacitor. Note that the positioning and fixing of the film X and the film Y are realized by, for example, inserting a plurality of through holes formed in both films through a plurality of positioning pins erected on the surface of the metal plate 22.

[0026]

According to the method for manufacturing a laminated metallized film capacitor according to the present invention, the electrode film of the metallized film and the dielectric film can be adsorbed by static electricity without using a thermocompression bonding step or an adhesion step. Can be tightly joined by utilizing In addition, when each film is laminated, such an electrostatic bonding process is repeated each time, so that unlike the conventional method in which each film is closely adhered after the capacitor element is formed, the film is uniformly adhered over the entire area inside the capacitor element. State can be realized. As a result, only the dielectric film is interposed between the electrode films inside the capacitor element, and there is no extra gap, so that it is possible to obtain a laminated metallized film capacitor having stable characteristics. Become.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a single-sided metallized film.

FIG. 2 is a cross-sectional view showing the internal structure of a laminated metallized film capacitor.

FIG. 3 is a cross-sectional view showing a step of laminating a one-sided metallized film.

FIG. 4 is a cross-sectional view showing a step of laminating a one-sided metallized film.

FIG. 5 is a cross-sectional view showing a step of laminating a single-sided metallized film.

FIG. 6 is a cross-sectional view showing a step of laminating a single-sided metallized film.

FIG. 7 is a cross-sectional view showing a step of laminating a one-sided metallized film.

FIG. 8 is a cross-sectional view showing a step of laminating a one-sided metallized film.

FIG. 9 is a sectional view showing a step of laminating a double-sided metallized film and a dielectric film.

FIG. 10 is a sectional view showing a step of laminating a double-sided metallized film and a dielectric film.

FIG. 11 is a sectional view showing a step of laminating a double-sided metallized film and a dielectric film.

FIG. 12 is a sectional view showing a step of laminating a double-sided metallized film and a dielectric film.

FIG. 13 is a sectional view showing a step of laminating a double-sided metallized film and a dielectric film.

FIG. 14 is a cross-sectional view showing a step of laminating a double-sided metallized film and a dielectric film.

FIG. 15 is an explanatory view showing a state where another wound film is rolled on one developed film and both films are laminated.

FIG. 16 is a perspective view showing a process of forming a conventional wound metallized film capacitor.

FIG. 17 is a sectional view showing an internal structure of a conventional wound metallized film capacitor.

[Explanation of symbols]

 10 Single-sided metallized film 12 Dielectric film 14 Electrode film 16 Capacitor element 18a External electrode 18b External electrode 20 Capacitor 22 Metal plate 24 Ion generator 26 Double-sided metallized film X Deployment film Y Rolled film

Claims (5)

[Claims] A capacitor element is formed by laminating a plurality of metallized films each having an electrode film formed on one surface of a dielectric film, external electrodes are formed at both ends of the capacitor element, and the dielectric film is interposed therebetween. A method of manufacturing a laminated metallized film capacitor in which each electrode film arranged oppositely is alternately connected to a different external electrode.When laminating each metallized film, each metallized film is charged and then laminated. A method for producing a laminated metallized film capacitor, wherein the dielectric film of each metallized film and the electrode film of another metallized film are tightly joined together by utilizing static electricity. 2. A capacitor element is formed by alternately laminating a plurality of metallized films each having an electrode film formed on both surfaces of a dielectric film and dielectric films, forming external electrodes at both ends of the capacitor element. A method of manufacturing a laminated metallized film capacitor in which each of the electrode films facing each other with a body film interposed therebetween is alternately connected to different external electrodes, wherein each metallized film and a dielectric film are laminated. By stacking each metallized film and dielectric film after charging, the electrode film of each metallized film and the dielectric film are tightly joined by utilizing static electricity. Manufacturing method of metallized film capacitor. 3. A film is placed on a grounded conductive plate, the film is charged by irradiating ions on the upper surface of the film, and then the other film is superimposed. The method for producing a laminated metallized film capacitor according to claim 1. 4. A large number of electrode films are formed on the metallized film in advance at predetermined intervals, and after laminating the films, the laminated body of the film is cut into metal film units. The method for producing a laminated metallized film capacitor according to any one of claims 1 to 3, wherein a large number of capacitor elements are formed. 5. The multi-layer metallization according to claim 4, wherein, after charging one of the unfolded films, the other wound film is rolled and overlapped on the charged surface. Manufacturing method of film capacitor.