JPH0358168B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a metallized film capacitor that can easily produce a metallized film capacitor with excellent noise prevention effects.

In general, a noise prevention capacitor prevents high frequency noise from flowing in or out from electronic equipment, and as shown in FIG.
4 is laminated and wound, metallicon electrodes 5 are formed on both end faces, and lead wires 6 are attached to the metallicon electrodes 5 to form a so-called non-inductively wound metallized film capacitor. However, in general, when expressed as an equivalent circuit even with non-inductive winding, Therefore, L portion always exists.

Therefore, the effect of preventing noise components having a frequency higher than the resonance point determined by C and L gradually decreases, and the noise prevention function is lost. Therefore, in the past, the lead wires were made as short as possible, or as shown in FIG.
In order to reduce the length of L as much as possible by winding the wires in a layered manner and extending two lead wires 12 from each electrode lead-out portion formed on both end faces, there is a limit to the noise absorption ability at high frequencies. It has not been an effective countermeasure.

In addition, in recent years, as disclosed in Japanese Patent Application Laid-open No. 57-40915, a plurality of capacitance sections divided by vapor deposition blanks are configured in one capacitor element, and leads are connected from each capacitance section. There has also been a proposal to draw out a line, that is, to construct a capacitor in each fan-shaped divided area divided in the circumferential direction of a cylinder, but it is easy to create fan-shaped divided areas in the circumferential direction of a cylindrical shape. Instead, we were faced with a number of practical issues.

The present invention has been made in view of the above points, and
In the process of laminating and winding a first single-sided metallized film with margins formed on both end faces in the width direction and a second single-sided fully metalized film that is wider than the film and does not have margins, the second Vapor deposition removed portions are formed intermittently at intervals gradually increasing every two or three in the length direction of the single-sided, fully metalized film, and the vapor deposition removed portions overlap radially to form a winding element. It is an object of the present invention to provide a method for manufacturing a metallized film capacitor which can obtain a metallized film capacitor having an excellent noise prevention effect in which the circumference is equally divided into two or three by vapor deposition removal parts.

The details of the present invention will be explained below. That is,
FIG. 3 is a schematic diagram illustrating a manufacturing method in which the circumference of an element is equally divided into two parts by a vapor deposition removal section according to an embodiment of the present invention. a first single-sided metallized film 22 having margin portions on both end faces in the width direction;
A second single-sided metalized film 24 having a width wider than the single-sided metalized film 22 and having a vapor-deposited metal applied to the entire surface of one side is wound around the core 25 of the second single-sided metalized film 2.
When stacking and winding the second single-sided metallized film 24 with both end faces in the width direction protruding, a roller electrode 2 whose entire periphery is conductive, for example, is placed on the vapor-deposited metal surface of the second single-sided metallized film 24.
6 is brought into contact with the roller electrode 26 and rotated in synchronization with the winding core 25 at a position spaced apart from the roller electrode 26 so that the winding core 25 rotates once as shown in FIG. The outer periphery is equally divided into two parts, and the second single-sided metallized film 24 is placed on the opposing parts.
A vapor deposition removal portion forming roller 28 is provided with plate-shaped protruding electrodes 27 that alternately contact the vapor deposited metal surface by rotating.

Note that a power source 29 is connected between the plate-shaped protruding electrode 27 and the roller electrode 26 that constitute the vapor deposition removal portion forming roller 28.
The voltage is applied by By rotating the winding core 25, the first
The single-sided metalized film 22 and the second single-sided metalized film 24 are run in the direction of the arrow. then,
Since the vapor deposition removing portion forming roller 28 is rotationally synchronized with the winding core 25 and rotates once when the winding core 25 rotates once, the vapor deposition removing portion forming roller 28 also rotates in conjunction with the rotation of the winding core 25. When the plate-like protruding electrode 27 contacts the second single-sided metallized film 24 during rotation, the contact portion generates an electric discharge, and the vapor deposited metal in that portion is scattered, causing the vapor deposition removal portion 30 to be moved in accordance with the rotational speed of the winding core 25. form one after another. In this case, the plate-like protruding electrode 27 is brought into contact with the second single-sided metallized film 24 by the rotation of the vapor deposition removal section forming roller 28 which is interlocked with the rotation of the winding core 25. The contact position with respect to the single-sided metallized film 27 of No. 2 is expanded at intervals corresponding to the winding thickness (number of turns) of the film wound around the winding core 25. Capacitor elements are formed intermittently at intervals that gradually widen every two in accordance with the number of turns of the capacitor element, and the capacitor element is equally divided into two parts on the winding core 25 by vapor deposition removal parts 30 that overlap radially when viewed from both end faces. 31 is completed.

In this case, the second single-sided metallized film 24
The part located at the beginning of winding is a plate-like protruding electrode 27
A continuous vapor deposition removal section is formed by the continuous contact of the two, and this section is configured as the empty winding section 32.

Next, as shown in FIG.
Metallicon electrodes 33a, 33b and 34a, 34b are formed on the surfaces excluding the vapor deposition removed portions 30 on both end surfaces.
As shown in FIG. 6, lead terminals 35a, 35b and 36a, 36b are attached to each of a and 34b, and an exterior resin 37 is applied. FIG. 7 is a developed plan view of the capacitor element 31.

According to the above method, it is possible to form evaporation removal parts radially on both end faces of a capacitor element with a simple modification of a part of a conventional winding machine, and the effect on the manufacturing method is also extremely large. Of course, the metallized film capacitor thus obtained has low inductance and is excellent in noise prevention effects in the high frequency range.

In the above embodiment, the explanation is given by exemplifying the case where the electrode is divided into two equal parts. However, the present invention is not limited to this, and for example, a plate-like protruding electrode that is divided into three equal parts can be used as the vapor deposition removal part forming roller. By this method, a capacitor that can be applied between three-phase lines in which the vapor deposition removal section is equally divided into three parts can be easily obtained.

Further, the shape of the capacitor element is not limited to the round shape as in the above embodiments, but it goes without saying that the same effect can be achieved even if the capacitor element is made into a flat shape.

Next, the effects of the metallized film capacitor obtained by the present invention will be described based on experimental results. That is, as shown in FIG. 8, in a circuit in which the noise generation source 38 and the capacitor 40 of the selective amplifier 39 are inserted, the attenuation level with respect to frequency depending on the type of capacitor 40 was measured, and the results were as shown in FIG. In FIG. 9, A is when the capacitor according to the present invention shown in FIG. 6 is used, B is when the capacitor according to the conventional reference example shown in FIG. 2 is used, and C is when the capacitor according to the conventional reference example shown in FIG. 1 is used. This is a case where capacitors are used, and the capacitor ratings of A, B, and C are all 125VAC-0.1μF.

As is clear from FIG. 9, the invention A exhibited an excellent noise prevention effect when compared with both the conventional reference examples B and C.

As described above, according to the present invention, there is a first single-sided metallized film in which margin portions are formed on both end faces in the width direction, and a second single-sided metallized film in which vapor-deposited metal is applied to the entire surface of one side with a wide width. When the film is laminated and wound around the winding core, by contacting the plate-like protruding electrodes constituting the vapor deposition removal section forming roller in synchronization with the winding core, the second single-sided metallized film is made to have an interval in the length direction. The evaporation removed portions are formed intermittently with the evaporation removed portions gradually expanding every two or three, and the evaporation removal portions are overlapped radially to divide the circumference of the capacitor element into two by the evaporation removal portions. Alternatively, by dividing it into three parts, a metallized film capacitor with good workability and excellent noise prevention effect can be obtained.
A method for manufacturing a metallized film capacitor with high practical value can be obtained.

[Brief explanation of drawings]

1 and 2 are perspective views showing respective metallized film capacitors obtained by conventional means, and FIGS. 3 to 7 show an embodiment of the present invention, and FIG. A schematic diagram showing the manufacturing process, FIG. 4 is a perspective view showing the vapor deposition removal part forming roller that constitutes FIG. 3, and FIG. 5 A and B show the capacitor element before metallization. Front view, No. 6
The figure is a perspective view showing the completed capacitor, Figure 7 is a developed plan view of the capacitor element shown in Figure 5, Figure 8 is an experimental circuit diagram of the capacitor, and Figure 9 is a frequency-noise level characteristic curve diagram. . 22...first single-sided metallized film, 24...
Second single-sided metallized film, 25... Winding core, 26
...Roller electrode, 27...Plate-like protruding electrode, 28...
... Vapor deposition removal section forming roller, 30... Vapor deposition removal section,
31...Capacitor element, 33a, 33b...Metallicon electrode, 34a, 34b...Metallicon electrode, 35a, 35b...Lead terminal, 36a, 3
6b...Lead terminal.

Claims (1)

[Claims] 1. A first single-sided metallized film with margins provided on both end faces in the width direction, and a second single-sided metalized film that is wider than the film and has a vapor-deposited metal applied to the entire surface of one side. A capacitor element in which the film is laminated and wound with both end faces in the width direction protruding from each other, and the first single-sided metalized film functions as an intermediate electrode and the second single-sided metalized film functions as a lead terminal.The capacitor element is divided into two or three radially. When forming the vapor deposition removal portion forming roller, the roller electrode is in contact with the second single-sided metallized film in advance, and the vapor deposition removal portion forming roller is rotationally synchronized with the energized core. The plate-like protruding electrodes are alternately brought into contact with the vapor-deposited metal surface of the second single-sided metallized film by rotating the winding core, so that two plate-shaped protruding electrodes are placed in the lengthwise direction of the second single-sided metalized film. Alternatively, the method of continuously forming vapor deposition removal portions intermittently in the length direction at intervals that gradually widen every third, and dividing the core into two by radial vapor deposition removal portions located on both end faces of the winding core. Alternatively, a capacitor element divided into three parts is formed, and then metallicon electrodes are formed on both end faces of the capacitor element which are removed from the winding core, excluding the vapor deposition removed parts, and terminals are attached to each of the metallicon electrodes. A method for manufacturing a metallized film capacitor, characterized by: