JPS6244520Y2 - - Google Patents

Description

[Detailed explanation of the idea]

This invention relates to a tab drawer wound type capacitor, and prevents damage to the dielectric material due to burrs on the drawer tab itself at the connection between the electrode and the drawer tab, or burrs and protrusions that occur during connection processing such as welding and caulking. The aim is to improve reliability without compromising productivity. Conventionally, in tab drawer wound type capacitors, a protective film or paper has been inserted at the connection between the electrode and the drawer tab, as shown in FIGS. 1 and 2. Figure 1 shows a conventional example in which pull-out tabs 1, 1' are connected to the ends of electrodes 2, 2'. ' is folded back and the connecting part is sandwiched from above and below. In this case, it is necessary to either fold back the inserted protective film or insert a protective film that has been folded in half, which significantly reduces the efficiency of the capacitor element winding operation and It is impossible to use the winder. Figure 2 shows electrode 2,
A case is shown in which the pull-out tabs 1, 1' are connected to the central part of the pull-out tabs 2', and only a protective film or paper 4, 4' is inserted onto the pull-out tabs 1, 1', respectively. Using this method, it is possible to use an automatic winder, but since the lower side of the connection between the electrodes 2, 2' and the pull-out tabs 1, 1' is not protected, the dielectrics 3, 3' cannot be connected. There was a risk of damage due to burrs or protrusions on the parts, causing both electrodes to contact and short circuit.
If the dielectrics 4, 4' were made thicker to prevent this risk, the shape of the capacitor would become larger, which was undesirable. The present invention is a wound capacitor that eliminates the above-mentioned drawbacks and can completely protect the connection portion without reducing work efficiency. FIGS. 3 and 4 show an embodiment of the present invention, and FIG. 3 shows a case where the pull-out tabs 1, 1' are connected to the ends of the electrodes 2, 2'. A protective film 5, 5' having a length of 1' is inserted over the pull-out tabs 1, 1'. The protective film 5' protects the connection between the electrode 2 and the pull-out tab 1 from below the dielectric 3.
Exactly the same effect as the protective film 4 shown in the figure, which is conventionally folded in two, can be obtained without having to be folded in half. In addition, in FIG. 3, since a pull-out tab is connected to the end of the electrode, there is no practical problem even if the protective film 5 is short. FIG. 4 shows a case where the pull-out tabs 1, 1' are connected to the center portions of the electrodes 2, 2', and a protective film 5, 5' having a length spanning the pull-out tabs 1, 1' is attached to the pull-out tabs 1, 1'. Insert above. drawer tab 1
The connection between the electrode 2 and the pull-out tab 1' will be protected from above and below by protective films 5 and 5', and the connection between the pull-out tab 1' and the electrode 2' will be at the position indicated by the dotted line after one rotation. It is protected from above and below by the protective film 5 arranged and the protective film 5' inserted over the pull-out tab 1'. As described above, according to the present invention, the protective film can be simply inserted without being folded in half, so it can be easily and automatically inserted into an automatic winder. It can be applied to various capacitor elements by simply adjusting the . Furthermore, it is possible to reliably prevent short circuits between electrodes due to burrs or protrusions at the connection portion. Further, even if the protective films 5, 5' are inserted in the positions shown in FIG. 5, the same result will be obtained for the wound capacitor element. Next, a 0.1 μF capacitor was manufactured using a 6 μm thick polyester film as the dielectric and a 25 μm thick polyester film as the protective film, and the results are shown in the table. The efficiency (%) in the table is calculated by measuring the number of capacitor elements wound per unit time in a winding machine, and converting the results to 100 when no protective film is used. In addition, the yield in the table indicates the degree of improvement (increase rate) in product yield due to the use of a protective film, and the yield of products without a protective film (number of non-defective capacitors / number of windings in progress x 100%) ) was 95%, but by using a protective film, short circuit defects were eliminated, and the product yield increased by 3% with this product.
Indicates an increase. Based on a capacitor without a protective film, the capacitor according to the present invention can improve yield with almost no decrease in work efficiency, and also has increased DC breakdown voltage and improved reliability compared to conventional products. was completed.

[Table] As mentioned above, by improving the method of inserting the protective film, the present invention can be applied to automatic winding machines without reducing work efficiency.
It is an industrially useful idea that can improve yield and reliability, and can be applied to all tab-drawer wound capacitors.

[Brief explanation of the drawing]

1 and 2 are examples of conventional capacitors, a is a partially exploded perspective view, b is an exploded side view, and FIGS. 3 to 5 are examples of the capacitor of the present invention.
A is a partially disassembled perspective view, and b is a disassembled side view. 1, 1': Pull-out tab, 2, 2': Electrode, 3,
3': dielectric, 4, 4', 5, 5': protective film.

Claims (1)

[Scope of utility model registration request] In tab drawer wound type capacitors in which a protective film or paper is interposed at the connection between the electrode and the drawer tab, there is a prescribed distance between at least two opposite electrode drawer tabs in the winding length direction excluding the winding start end of the electrode. A protective film or paper with a distance L and longer than the distance L is inserted between the dielectric and the electrode, and the connection part between the electrode and the pull-out tab is connected to the opposing electrode on both the outer and inner sides. A capacitor comprising a protective film or paper and a dielectric material interposed therebetween.