JPH11307385A - Compound film capacitor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compound film capacitor, to improve mounting property, to reduce space and to improve safety in the double focusing circuit of a display. SOLUTION: Metal electrodes An and Bn are insulated by an insulating part 2 in the length direction of a dielectric film 1 and an insulating part 3 in a width direction by vapor deposition and a plurality of electrodes are formed. A plurality of metal electrodes are formed on a dielectric film 4 in the same way as the dielectric film 1. The electrodes on the face of the dielectric film 1 are overlapped so that they are overlapped with two adjacent electrodes in the length direction, which are arranged on the face of a dielectric film 5 and face each other, and they are wound into a roll form in the length direction to form a capacitor element. Terminals 5-8 are pulled out from the electrodes on both ends in the length direction, and a composite film capacitor is constituted. Thus, the capacitors of high withstand voltage are obtained between the terminal 5 and the terminal 6 and between the terminal 7 and the terminal 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-voltage film capacitor used for a high-voltage circuit of a display using a cathode ray tube (CRT).

[0002]

2. Description of the Related Art Conventionally, a circuit using a plurality of capacitors requiring a withstand voltage of several kV or more, for example, a double focus circuit of a display using a CRT, has a resistance of 10 to 15 kV.
Having a withstand voltage of about V and a capacitance of 100 to 1000 p
Two capacitors of F are prepared, fixed one by one with a holder or the like, connected to a circuit, and assembled, which is a problem in reducing the number of parts and improving productivity. .

For this reason, a high-voltage composite capacitor having a plurality of capacitor elements has been devised in the past from one capacitor element, and Japanese Patent Publication No. 7-46667.
No. 6,086,045. Its structure is shown in FIG. 4, its equivalent circuit is shown in FIG. 5, and its appearance is shown in FIG. 6, so that a plurality of capacitor elements are connected in series in the length direction of the dielectric film 1. A metal electrode 2a is arranged, a dielectric film 1 is formed on the metal electrode 2a, and a metal electrode 2b is formed so as to overlap with an adjacent metal electrode 2a via the dielectric film 1. Then, by extracting terminals from both electrodes and an arbitrary intermediate electrode of the metal electrode 2b, a composite capacitor having two high withstand voltage capacitors as shown in FIG. 5 is formed. FIG. 6 shows a configuration in which the above-described configuration is wound into a capacitor.

[0004]

However, in the above-mentioned conventional configuration, two capacitors formed in one capacitor element are required.
The high withstand voltage capacitors have a common intermediate electrode. Therefore, there is a disadvantage that two capacitors cannot be used in a completely independent circuit as in the case of the double focus circuit. Further, since a high voltage of 10 kV to 15 kV is applied to the capacitor, it is necessary to secure a distance between the joint terminals having different polarities when connecting the terminals of the capacitor to the circuit. For this reason, there is a problem that it is not easy to save the space of the focus circuit, and the wiring of the terminals of the two capacitors becomes complicated.

According to the present invention, two capacitors can be used in a completely independent circuit such as a double focus circuit, and the mountability can be improved by unifying the polarity of the lead terminals of the capacitors on the same end face. The purpose is to reduce the space and improve safety.

[0006]

The composite film capacitor of the present invention comprises electrodes arranged on both sides of a dielectric film,
By dividing the capacitor into two parts in the width direction by the insulating part in the length direction and forming capacitors in the length direction using the respective electrodes, two capacitors insulated from each other can be obtained. And a composite fill capacitor that can be used for an independent circuit.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the first aspect of the present invention, the electrodes arranged on both surfaces of a dielectric film are divided into two parts in the width direction by insulating parts in the length direction. Consisting of a plurality of electrodes insulated from each other in the length direction of the dielectric film, the electrode on one surface of the dielectric film overlaps and faces two electrodes adjacent to each other in the length direction arranged on the other surface. The capacitor elements are formed in such a manner that the terminals are drawn out from the electrodes at both ends in the longitudinal direction, and the terminal leads are drawn out from the end face of the same element, and two terminals are insulated from each other in one capacitor element. A composite film capacitor having a high withstand voltage capacitor can be obtained.

The invention according to claim 2 of the present invention is characterized in that
When winding the composite film capacitor in a roll, pull out each terminal from the winding start side from the same end face of the formed composite film capacitor, and pull out the terminal from the winding end side as described above from the winding start side. The high-voltage terminals of the two capacitors inside the composite film capacitor are more reliable if the terminal that is pulled out from the winding start side is used as the high-voltage terminal. By unifying the drawing directions, the distance between terminals having different polarities can be secured.

Hereinafter, an embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG. (Embodiment 1) FIG. 1 is a structural view of a composite film capacitor of the present invention. In the figure, a metal electrode An such as aluminum is insulated from a strip-shaped dielectric film 1, for example, a polyester film, by an insulating part 3 in a length direction and an insulating part 4 in a width direction of the dielectric film 1 by vapor deposition or the like. To form a plurality. Further, a plurality of metal electrodes are formed on the dielectric film 5 in the same manner as the dielectric film 1, and two electrodes adjacent to each other in the length direction are arranged on the surface of the dielectric film 5. And a capacitor element is formed by winding in a roll shape in the longitudinal direction to form a capacitor element, and terminals 5 to 8 are pulled out from electrodes at both ends in the longitudinal direction to form a composite film capacitor. With this configuration, a high withstand voltage capacitor in which a plurality of capacitor elements C1 to Cn are connected in series as in the equivalent circuit shown in FIG. 2 is obtained between the terminals 5 and 6 and between the terminals 7 and 8. A composite film capacitor having two high-voltage capacitors insulated from each other among the capacitor elements can be obtained. FIG. 3 is an external view of the composite film capacitor of the present invention wound in a roll shape.

(Embodiment 2) FIG. 1 is a structural view of a composite film capacitor of the present invention. In the drawing, terminals 5 to 8 are drawn from the electrodes at both ends in the length direction to form a composite film capacitor. At this time, the terminal 7 drawn from the metal electrode Bn is drawn in the direction in which the terminal 5 is drawn. The electrode Bn is intentionally lengthened to an arbitrary length, and a terminal is drawn out. Similarly, in order to pull out the terminal 6 drawn from the metal electrode A1 in the direction in which the terminal 8 is drawn, the metal electrode A1 is intentionally lengthened to an arbitrary length and the terminal is drawn. As a result, it is possible to unify the direction of pulling out the same-polarity terminal of each capacitor, thereby improving the mountability of the capacitor in the flyback transformer.

In the above description, a polyester film is used as the dielectric film. However, a polypropylene film, a polyethylene naphthalate film, or the like can also be used without limitation.

Further, although one dielectric film has been described between the electrodes, the present invention can be similarly implemented by stacking a plurality of dielectric films.

As the metal electrode formed on the dielectric film, a metal foil can be used in the same manner. In particular, a configuration in which the metal foil is used only for the electrode connecting the terminals and the other electrode is a vapor-deposited electrode is preferable for improving reliability. .

By setting the X and Y dimensions in FIG. 1 arbitrarily, it is possible to arbitrarily obtain the capacitance of the two capacitors.

When the terminal is drawn out in a roll shape, it is desirable to set the terminal on the winding start side to the high voltage side in order to improve reliability.

[0016]

According to the present invention, a composite film capacitor having two high-voltage capacitors insulated from each other in one capacitor element can be obtained, and the number of components in a circuit to be used can be reduced. However, since mountability is improved, there is an effect that productivity can be improved.

[Brief description of the drawings]

FIG. 1 is a structural view showing a composite film capacitor according to an embodiment of the present invention.

FIG. 2 is a diagram showing an equivalent circuit of the composite film capacitor according to one embodiment of the present invention.

FIG. 3 is an external view of a composite film capacitor according to an embodiment of the present invention.

FIG. 4 is a structural diagram of a conventional composite film capacitor.

FIG. 5 is a diagram showing an equivalent circuit of a conventional composite film capacitor.

FIG. 6 is an external view of a conventional composite film capacitor.

[Explanation of symbols]

 1, 4 Dielectric film 2 Insulating portion in the length direction of the dielectric film 3 Insulating portion in the width direction of the dielectric film 5 to 8 terminal 9 Metal foil electrode 10 Lead wire An, Bn, A'n, B'n, 2a, 2b metal electrode

Claims (2)

[Claims] An electrode disposed on both sides of a dielectric film,
The electrode is divided into two in the width direction by an insulating portion in the length direction, and each electrode is composed of a plurality of electrodes insulated from each other in the length direction of the dielectric film, and the electrode on one surface of the dielectric film is the other. 2 adjacent to each other in the length direction arranged on the surface of
A composite film capacitor in which two capacitors insulated from each other can be obtained by forming a capacitor element by arranging them so as to overlap with and oppose each other, and drawing out terminals from both electrodes in the longitudinal direction. 2. In the case where the composite film capacitor is wound into a roll, the respective terminals pulled out from the winding start portion are pulled out from the same end face of the formed composite film capacitor, and the terminals pulled out from the winding end portion. 2. The composite film capacitor according to claim 1, wherein the terminal is pulled out from an end surface opposite to an end surface of the terminal drawn out from the winding start portion.