JPH0159730B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a multilayer capacitor.

Film capacitors are becoming more laminated and smaller, and when manufacturing these laminated capacitors, dielectric material and electrode foil are alternately placed around the outer periphery of a large-diameter winding drum, and the film is wound to a predetermined number of laminated layers while applying a predetermined tension. After this, the ring-shaped laminated capacitor base material is removed from the drum and cut into a predetermined size to form one capacitor element. Then, the capacitor base material and the cut capacitor elements are placed in a case and protected with resin, and used as the desired capacitor, or heat-fusible or adhesive material is used as a separation material during winding of the dielectric and electrode foil. Tape is inserted to protect the sides of each capacitor element that has been cut from the capacitor base material.

However, with this method, it is difficult to manufacture a capacitor as designed because electrode foils, dielectric films, etc. on both sides of each element cut from the capacitor base material peel off, and separation materials peel off.

The present invention has been made in view of this, and in manufacturing a multilayer capacitor, a sheet-like separating material made of thermosetting resin or the like is wound at the beginning and end of winding of a capacitor base material, and after the base material is completed, metallicon The gist of the present invention is to manufacture a capacitor element which is processed and heat-treated, cut into units, and both sides of the capacitor element are protected and packaged with the separating material.

The present invention will be explained below based on examples. In the figure, 1 is a winding core (winding drum) that winds and forms the base material of a multilayer capacitor to the required thickness or lamination thickness.This winding core has a predetermined diameter, and although it is not shown in the figure It is designed to rotate at a rotation speed set by a drive device. At least one roll of dielectric material 2 is disposed so as to face the outer peripheral surface of core 1. The number of rolls is determined by the combination of metallized film, electrode foil, plastic film, etc. The number of rolls of dielectric material 2 wound around core 1 is predetermined based on the capacitance of the capacitor element to be formed. When winding this metallized film, etc., at the beginning of winding onto the winding core 1, that is, at the beginning of winding on the winding core 1.
First, a separating material 3 such as a sheet of thermosetting resin tape (epoxy resin), plastic film or cloth coated with thermosetting resin is wound around the outer periphery of the membrane once or more, and then the desired dielectric material is applied. It is used to collect the body. A layer of the capacitor element is wound around the outer periphery of the core, that is, when only one layer of the capacitor element is wound around the outer periphery of the core, the above-mentioned separation material is placed on the outermost surface at the end of winding of the dielectric material. 3 is wound at least once or more. Further, when two or more layers of capacitor elements are wound around the core in the radial direction, the separating material 3 is wound together for each layer of the element as shown in the figure. The separating material 3 is at least double-layered so that the capacitor elements of the inner and outer layers can be separated and independent from each other by the separating material 3, and the separating material 3 is not bonded by heat curing between the contact surfaces of the separating material so that the separating material of each layer can be easily separated. Either they are treated as such (for example, no resin is applied to the surface to be separated), or they are wound up together by inserting an auxiliary separator 3a made of plastic film, thin metal plate, or other film. .
Of course, at the beginning of dielectric winding, the separating material 3 wound around the outer circumferential surface of the winding core does not adhere to the core surface, but adheres to the dielectric surface, and the separating material on the outermost circumferential surface is also It is inserted and wound in such a way that it is not bonded but is bonded to the dielectric material on the inner surface.

Next, metallicon treatment 5 is applied to both sides of the capacitor base material 4 formed as described above, and heat treatment is performed by heating to such an extent that the separation material has adhesive strength due to thermosetting. Through this heat treatment, both sides of the capacitor element, that is, the inner and outer surfaces of each element in the capacitor base material, are adhesively bonded together with the outer part of the dielectric material using the thermosetting resin as the separating material, making it difficult to peel off. be protected. Next, this capacitor base material 4 is cut into one capacitor element to obtain a desired capacitor element.

According to the present invention, both sides of the capacitor element (the surfaces not subjected to metallicon treatment) are protected by thermosetting resin, and the dielectrics on both outer sides are bonded together by the adhesive force of the resin. There is an advantage in that even after the capacitor is cut from the capacitor base material, the dielectric on both sides does not peel off even when it is turned into a capacitor element, and a capacitor having the performance as designed can be easily manufactured.

[Brief explanation of drawings]

Figure 1 is an explanatory diagram showing the method of forming the capacitor base material, Figure 2 is a side view of the capacitor base material wound in multiple layers, Figure 3 is a cross-sectional view of Figure 2, and Figure 4 is the separation material. 5 is an external view of a completed capacitor element, FIG. 6 is a sectional view thereof, and FIG. 7 is a diagram of a known capacitor element. DESCRIPTION OF SYMBOLS 1... Core, 2... Dielectric, 3... Separation material, 3a... Auxiliary separator, 4... Capacitor base material, 5... Metallicon treatment, 6... Lead wire.

Claims (1)

[Scope of Claims] 1. In manufacturing a multilayer capacitor, a sheet-like separating material made of thermosetting resin or the like is wound at the beginning and end of the winding of the capacitor base material, and after the base material is completed, metallicon treatment and heat treatment are performed. A method for manufacturing a capacitor, characterized in that the capacitor element is processed and cut into units, and both sides of the capacitor element are protected and packaged with the separating material. 2. In the production of multilayer capacitors, a sheet-like separating material made of thermosetting resin or the like is wound at the beginning of winding of the capacitor base material and between the capacitor elements of the inner and outer layers, and the above-mentioned material is also wound at the end of winding of the dielectric material. The separation material is rolled up to form a capacitor base material, and then both end faces of the capacitor are treated with metallicon and heat treated so that the capacitor elements are separated between each layer of separation material, and the capacitor elements are separated by the separation material. A manufacturing method for capacitors in which both sides of the capacitor are packaged and protected and then cut into units.