JPH0326532B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a capacitor having multiple coaxially wound elements.

Generally, when forming a multi-element capacitor by stacking and coaxially winding two metallized films having vapor-deposited electrodes, a separator is placed between the electrodes by scattering part of the vapor-deposited electrodes or cutting the metallized film. It is interposed and insulated and wound.

Conventionally, as shown in FIG. 1 or 2, a capacitor as described above is manufactured by scattering a part of the vapor-deposited electrodes 1a, 2a of the metallized films 1, 2 to form the vapor-deposited electrodes 1a.
is divided into a core side and an outer circumferential side, and an insulating separator 3 made of paper or plastic, which is wider than the metallized films 1 and 2, is interposed between the divided electrodes G, and coaxially wound with the other metallized film 2. A capacitor element 4 was formed, and a metallicon metal 5 was attached to the end face of the capacitor element 4 to form a structure as shown in FIG. 3.
1b and 2b are plastic films. For this reason, the metallicon metal adheres to the ends of the insulating separator 3, so the metallicon metal 5 adhering to the insulating separator 3 is scraped off, or the protrusion 3a of the insulating separator 3 is cut off by one or two turns. The capacitor elements on the core side and the outer circumferential side were mechanically removed to insulate the capacitor elements on the core side and the outer circumferential side, but this method required many man-hours, was difficult to automate, and caused sparks if metal powder remained in the removed part of the metallcon metal 5. There was a problem.

In order to solve the above-mentioned problems, the present invention covers the protruding part of the insulating separator protruding from the end face of the capacitor element in advance with a heat-shrinkable tube that is slightly larger than the outer diameter of the protruding part and shrinks it by heating. This method of manufacturing a capacitor is characterized in that after metallicon metal is adhered to the entire end face of the element, the heat-shrinkable tube is removed to remove metallicon metal adhered between capacitor elements.

The present invention will be explained below with reference to an embodiment shown in FIG.

FIG. 4 is an explanatory diagram of a capacitor in the manufacturing process. First, as shown in FIG. 1 or FIG. An insulating separator 3 is inserted and wound to form a two-element capacitor 4. Next, the protrusion 3a of the insulating separator protruding from the end face of the element 4 is covered with a heat-shrinkable tube 6 that is slightly larger than the outer diameter of the protrusion 3a, and is heated and shrunk. The outer periphery is tightly covered with a heat-shrinkable tube. Next, as shown in FIG. 4B, a metallicon metal 5 is attached to the end face of the capacitor element 4 by a spraying method or the like, and then the heat-shrinkable tube 6 is removed by tearing it off, etc. The metallicon metal 5 attached to the surface of the heat-shrinkable tube 6 is reliably removed from the end face of the capacitor element 4, that is, the outer surface of the insulating separator 3 as shown in FIG. The elements are isolated by insulation. Next, the attachment portion of the metallcon metal 5 described above and the external terminal are connected with a drawer lead, and the device is housed in an exterior case to complete the process.

Therefore, according to the manufacturing method of the present invention, the heat-shrinkable tube 6 is closely covered with the outer circumference of the protruding portion 3a of the insulating separator 3, so that the metallcon metal 5 does not enter between them, and the heat By tearing off the shrinkable tube, the metallicon metal 5 adhering between the winding core side and the outer peripheral side can be reliably and easily removed, so that no metal powder remains in the removed portion 3b, and sparks etc. This does not occur, the dielectric strength between each element is stable, and an extremely safe capacitor can be obtained.

Note that although the above-described embodiments have been described in the case of a two-element capacitor, capacitors with three or more elements can be manufactured in the same manner. Also, for the connection between each element, a heat-shrinkable tube 6 is applied only to one end face of the capacitor element 4, and the other end face is short-circuited between each element with a metallized metal 5 to form a common electrode lead-out portion. It can be applied in various ways.

As mentioned above, the capacitor manufacturing method of the present invention greatly contributes to improving productivity and safety, and is of great industrial and practical value.

[Brief explanation of the drawing]

Figures 1 and 2 are disassembled plan views of essential parts of a capacitor element, Figure 3A is a cross-sectional view of essential parts in the manufacturing process of a conventional capacitor element, Figure 3B is a perspective view of the same conventional capacitor element in the manufacturing process, Figure 4 A,
B and C are explanatory views of the manufacturing process of the capacitor element according to the present invention. 1, 2: metallized film, 1a, 2a: vapor deposited metal, 3: insulating separator, 4: capacitor element,
5: Metallicon metal, 6: Heat-shrinkable tube.

Claims (1)

[Claims] 1 Part of the vapor-deposited electrode of the metallized film is scattered or the metalized film is cut to divide the vapor-deposited electrode into the winding core side and the peripheral side, and an insulating separator wider than the metallized film is placed between the divided electrodes. A coaxially-wound multi-element capacitor is formed by interposing the capacitor element, and a heat-shrinkable tube slightly larger than the outer diameter of the protruding part is covered with a heat-shrinkable tube that is slightly larger than the outer diameter of the protruding part on the protruding part of the insulating separator protruding from the end face of the capacitor element, and the capacitor is 1. A method for manufacturing a capacitor, which comprises depositing metallicon metal on the entire end face of the element, and then removing the heat-shrinkable tube to remove metallicon metal deposited between capacitor elements.