JPH0115132B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a capacitor constructed by winding two dielectric sheets and two metal foils.

A conventional capacitor will be explained with reference to drawings.

Figure 1 is a perspective view of a conventional capacitor element, where 1 is a capacitor element in which two dielectrics and two metal foils are alternately overlapped and wound, and 2 is a capacitor element that is in contact with one of the metal foils. A metal lead piece 3 is inserted into the capacitor element 1 as shown in FIG.
is a lead piece that is inserted and connected to a terminal 3a that protrudes to the outside. The capacitor element 1 thus constructed is made into a capacitor by being covered with resin or sealed in a case together with insulating oil.

A winding machine (not shown) is used to wind the capacitor element 1, but in the case of the capacitor shown in the figure, the lead pieces 2,
It was necessary to stop the winding machine once to insert No. 3, which caused a decrease in work efficiency. In addition, since the capacitor element 1 wound in a cylindrical shape is used by crushing it into an oval shape, depending on the method of inserting the lead pieces 2 and 3, the lead pieces 2 and 3 may be inserted into the bent part of the oval-shaped capacitor element 1. Otherwise, the lead pieces 2 and 3 would protrude from the metal foil, causing non-uniformity of the electric field and dielectric breakdown.

Moreover, FIG. 2 is a side view of a conventional capacitor in which multiple capacitor elements are connected in series.
4, 5, 6, and 7 are capacitor elements formed by winding a dielectric and metal foil, 8 to 15 are lead pieces inserted into the capacitor elements 4 to 7, and 16 and 17 are connected to lead pieces 8 and 15. terminals, 18, 19,
20 are lead pieces 9 and 10, lead pieces 11 and 12,
Connect lead pieces 13 and 14 and connect capacitor element 4.
This is a lead wire that connects 7 to 7 in series. Lead piece 8
-15 are connected to terminals 16, 17 and lead wires 18, 19, 20 by crimping or the like. Therefore, force is applied to the lead pieces 8 to 15 during connection, causing the lead pieces 8 to 15 to shift or causing insulation breakdown due to improper connections between the lead pieces 8 to 15 and the terminals 16, 17 and lead wires 18, 19, 20. There was a drawback when I woke up.

In view of the above-mentioned drawbacks, the present invention aims to provide a capacitor that does not cause non-uniformity of the electric field, has higher work efficiency than conventional capacitors, and reduces the number of connecting parts and improves workability when connecting. It is something.

In order to achieve the above object, the present invention winds a capacitor element by adjusting the lengths of the dielectric and the metal foil so that the ends of the two metal foils are exposed outside the capacitor element at opposite positions. It has a structure in which lead pieces are connected to the exposed ends of two metal foils.

An embodiment of the present invention will be described below with reference to the drawings.

Fig. 3 is a perspective view of a capacitor according to an embodiment of the present invention, and Fig. 4 is a cross-sectional view of the same. Capacitor element, 26 is terminal 26
a lead piece to which a is connected and crimped to the metal foil 24;
A lead piece 27 is connected to a terminal 27a and is crimped onto the metal foil 25. The capacitor element 21 configured in this manner is made into a capacitor by being covered with resin or sealed in a case together with insulating oil.

As shown in the figure, the metal foils 24 and 25 are
It is wound so that a and 25a are exposed at opposing positions. And the ends 22 of the dielectrics 22 and 23
a, 23a, and end portions 24a of metal foils 24, 25,
The lengths of the dielectrics 22 and 23 are adjusted so that the distance from the lead pieces 25a is greater than the width of the lead pieces 26 and 27.

The capacitor of this embodiment has lead pieces 26, 27 after winding dielectrics 22, 23 and metal foils 24, 25.
The exposed ends 24a, 25 of the metal foils 24, 25
Crimp on a. As a result, there is no need to stop the winding work of the dielectrics 22, 23 and the metal foils 24, 25 midway, and the workability of the winding work of the capacitor element is greatly improved. In addition, since the connecting portions between the lead pieces 26, 27 and the metal foils 24, 25 are always visible, the metal foil 24 and 25, and no non-uniform electric field is generated within the capacitor element 21. As a result, the capacitor of this embodiment has a longer lifespan than conventional capacitors. Further, insulation of the outer periphery of the capacitor element using a dielectric material, which is used in conventional general capacitors, is not required, and it is possible to manufacture a capacitor at a lower cost.

In addition, as shown in FIG. 5, the metal foils 24, 25
exposed ends 24a, 25a and dielectrics 22, 2
By sandwiching protective paper 28, 29 between 3 and 3,
When the lead pieces 26 and 27 are crimped onto the metal foils 24 and 25, the metal foil 2 is damaged due to damage to the dielectrics 22 and 23.
Contact between 4 and 25 can be prevented from occurring.

FIG. 6 is a side view of the capacitor of this embodiment in which a plurality of capacitor elements are connected in series, and 28
~31 is the capacitor element of the same capacitor, 32~
39 is a lead piece 40 crimped to the exposed end of the metal foil of the capacitor elements 28 to 31.
Lead pieces 41, 42, 43 in contact with 5 and 36
are terminals connected to lead pieces 32, 39, and 40. The series connection of capacitor elements 28 to 31 includes lead pieces 33 and 34, lead pieces 35, 40, and 36,
It is sufficient if the lead pieces 37 and 38 are brought into contact with each other, and the capacitor elements 28, 29 or the capacitor element 30,
When only the capacity of 31 is required, use lead piece 4.
0 is brought into contact between the lead pieces 35 and 36, and the terminal 4
1 and 43 or terminals 42 and 43 are all that is needed. As a result, there is no need for lead wires, and there is no need for crimping the lead pieces and the lead wires, making it possible to connect the capacitors at a lower cost and more efficiently than with conventional capacitors.

As described above, the ends 24 of the metal foils 24 and 25
The dielectrics 22, 23 and the metal foils 24, 25 are wound with their lengths adjusted so that the ends 24a, 25a of the metal foils 24, 25 are exposed at opposing positions. By crimping the pieces 26 and 27, non-uniformity of the electric field does not occur, the manufacturing efficiency is higher than that of conventional capacitors, and the series and parallel connections are inexpensive.
It is possible to provide a capacitor that can be easily manufactured.

In the above embodiment, terminals 26a, 27 are attached to the exposed ends 24a, 25a of the metal foils 24, 25.
The lead pieces 26 and 27 to which the terminal a is connected are crimped, but the metal piece in which the terminal and the lead piece are integrally molded is attached to the exposed ends 24a and 2 of the metal foils 24 and 25.
5a also has the same effect as this embodiment.

As described above, in the present invention, two dielectrics and two metal foils are alternately stacked and wound so that the ends of the two metal foils are exposed at opposing positions. By adjusting the length of the metal foil and connecting each lead piece to each exposed end of the metal foil, unevenness in the electric field does not occur, and manufacturing efficiency is improved, making it possible to connect multiple capacitor elements. Connection work can be done easily and at low cost.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a capacitor element constituting a conventional capacitor, Fig. 2 is a cross-sectional view showing a state in which the capacitor elements are connected in series, and Fig. 3 is a perspective view of a capacitor element in a capacitor according to an embodiment of the present invention. Figure 4 is a cross-sectional view of the same capacitor element, Figure 5 is
The figure is a cross-sectional view of the capacitor element with a protective paper sandwiched between the capacitor elements, and FIG. 6 is a cross-sectional view of the capacitor element connected in series. 21... Capacitor element, 22, 23... Dielectric, 24, 25... Metal foil, 26, 27... Lead piece.

Claims (1)

[Claims] 1. A capacitor element in which a dielectric material and a metal foil are alternately layered and wound, and the ends of the dielectric material and the metal foil are alternately exposed on the outer surface, and the capacitor element is connected to the exposed end of the metal foil. A capacitor with a lead piece.