JPS5821313A - Wound type film condenser - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a welded part of a lead electrode of a wound film capacitor, and its purpose is to prevent the production of unusable defective products due to cutting of the electrode foil. To provide a roll-type lump/denna with a structure that prevents this.

Conventional wound type two-ilm capacitors are shown in Figures 1 and 2.
As shown in the figure, the first metal foil 1, the first plastic film 2, the second metal foil 6, and the second plastic film 401 are laminated, and the first metal foil 1 and the second metal foil 6 are laminated. Lead electrodes 5 and 6 are respectively welded 7 and wound around them, molded by heat press, and then covered with resin paint.

However, in the conventional structure described above, when molded by heat pressing, cracks may occur in the electrode foil at or near the welded portion of the lead electrode 5.6. If the electrode foil is cut due to this crack, the capacitance will be significantly reduced, so it must be rejected as an unusable defective product. For this reason, finished products require precise capacitance measurement inspection.

Cutting of the electrode foil due to the cracks described above may occur not only during the heat press process, but also during the subsequent painting process, other processes where external force is applied, and in some cases during use, so it is important to note that requires caution.

The present invention is intended to solve the above problems, and includes first and second strip-shaped metal parts forming electrodes and first and second strip-shaped plastic films forming a dielectric. In a structure in which the first and second metal foils are alternately laminated, lead electrodes are welded and wound around the first and second metal foils, and the metal foils are formed by heat pressing, the space between the first metal foil and the first plastic film and A portion K where the lead electrode is welded between the second metal foil and the second plastic film.

This is a wound type film capacitor characterized in that first and Jli2 band-shaped conductive pieces are interposed respectively.

An embodiment of the present invention will be described with reference to FIGS. 6 and 4. 1 is a first metal foil, 2 is a first plastic film, 6 is a second metal foil, 4 is a second plastic film, 5 is a lead electrode 7 welded to the metal foil of 1lE1, 6
is a single electrode that is welded to the second metal foil. 8 is a first conductive piece interposed between the first metal foil 1 to which the lead electrode 5 is welded and the first plastic film 2; 9 is the second metal foil 6 to which the lead electrode 6 is welded; This is a second conductive piece interposed between the second plastic film 4 and the second plastic film 4. Note that the illustrated embodiment uses a plastic film substrate 8.
Although it is formed by vapor-depositing alc metal 8b, 9b, it may be made of metal foil without the plastic film substrates 8a, 9m.The length 1 of this conductive piece 8°9 is the same as the lead electrode 5. The length must be long enough to sufficiently cover the cut portion of the electrode foil that is expected to occur due to cracks near the weld. Further, the width of the metal portion may be made equal to the width of the electrode metal foil 1.3.

The width o of the plastic film bases [8a and 9m is slightly larger than b for insulation reasons.

Since the present invention has the above configuration, when a capacitor element with lead electrodes welded and wound is molded by heat pressing, cracks may occur in the electrode welds, and the electrode foil may be cut during the manufacturing process or during use. Since conduction is maintained by the conductive pieces 8 and 9 and the capacitance of the capacitor is not reduced, this has an excellent effect of improving product yield and reliability.

[Brief explanation of the drawing]

Figure 1: Side view of a conventional wound film capacitor before winding Figure 2: Plane view of Figure 1 Figure 6 Figure 2 Side view of the embodiment of the present invention before winding Figure 4: Figure 6
Plan view of the figure [Symbols] 1.-.First metal foil, 2..First plastic film, 6..Second metal foil, 4..Second
plastic film, 5.6... lead electrode, 7
... Welded part, 8... First conductive piece, 9... Second conductive piece 1, ) 8a, 9tL... Plastic film substrate, 8b, 9b... Vapor deposited metal

Claims (1)

[Claims] (1) First and second strip-shaped metal foils forming electrodes and first and second strip-shaped plastic films forming a dielectric are alternately laminated, and leads are respectively attached to the first and second metal foils. In a structure in which electrodes are welded and wound 11L and formed by heat pressing, the lead electrode is between the first metal foil and the first plastic film and between the second metal foil and the second plastic film. A wound type two-ilm capacitor characterized in that first and second strip-shaped conductive pieces are respectively interposed in the welded portions.Q) The strip-shaped conductive pieces are strip-shaped metal foil or strip-shaped plastic film. Claim (1) characterized in that the substrate is formed by vapor deposition of Table 1iK metal of the substrate A product I Quantum Hayabusa.
Volume 11W Film Pundensa