JPS6320100Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a capacitor that has an improved structure for leading out lead wires from a plurality of capacitor elements.

Ideally, the capacitor is only for the capacitance, but
In reality, resistance and inductance exist due to electrode foils, lead wires, terminals, etc., which prevent the capacitor from functioning as a capacitor.

For this reason, conventionally, so-called non-inductive type capacitors have been devised to reduce the inductance. A conventional example is shown in Figure 1, which is a capacitor with a structure in which multiple capacitor elements are integrated by a band and built into a case.
Common lead wires 7 are soldered 8, 9, and 10 to the metallic contact parts 4, 5, and 6 provided on the end faces of the capacitor elements 1, 2, and 3, and the tips of the lead wires 7 are attached to the lid that seals the case. connected to a terminal that is A capacitor having such a structure has the effect that the inductance due to the electrode foil etc. can be improved and reduced because the end face is coated with metallized silicon, but it has the disadvantage that the influence of the inductance due to the lead wire 7 becomes large. In other words, if the equivalent circuit of only the capacitance and inductance of this capacitor is shown, it will be as shown in Figure 2. There are inductances L ₁ , L ₂ and L ₃ between each solder joint 10 . Therefore, the inductance between the terminal and each capacitor element 1, 2, and 3 becomes L ₁ , L ₁ +L ₂ , L ₁ +L ₂ +L ₃ , respectively, and becomes uneven, and the flowing signal is biased toward a specific element. There was a point where the deterioration rates did not match and the life of the capacitor as a whole was shortened. Another drawback was that the lead wire 7 was long, which made it difficult to reduce the inductance.

The present invention aims to improve the above-mentioned drawbacks, prevent deterioration of only specific capacitor elements, improve the overall lifespan, and provide a capacitor having a low inductance value.

In order to achieve the above object, the present invention is a capacitor in which multiple capacitor elements are integrated and built into a case, in which the bottom part is connected across the end face of each capacitor element, and the top part is connected to a terminal. The present invention provides a capacitor characterized in that it is provided with a lead plate that has a cylindrical shape.

Hereinafter, embodiments of the present invention will be described based on the drawings.

In FIG. 3, numerals 21, 22, and 23 are capacitor elements, which are made by winding metallized paper or film into a flat shape, and are impregnated with insulating oil such as synthetic oil or mineral oil. Each capacitor element 21,
22 and 23 are integrated by a band 24 made of aluminum metal or the like. Reference numeral 25 denotes a triangular or trapezoidal copper lead plate, the bottom portion 26 of which is connected to the metallic contact portions 27, 28, and 29 of each of the capacitor elements 21, 22, and 23. Reference numeral 30 denotes a case made of metal such as aluminum, tin, or brass, in which the capacitor elements 21, 22, and 23 are housed. 31 and 32 are each capacitor element 21, 22
and 23 are thick insulating paper for insulating the case 30 and the lid 33. The lid 33 is made of metal such as aluminum, and is caulked to the open end of the case 30. A terminal 34 is provided through the lid 33, and is connected to the upper end 35 of the lead plate 25.

FIG. 4 shows an equivalent circuit of only the capacitance and inductance of the above embodiment. That is, the metallic contact portions 27 of each capacitor element 21, 22, and 24,
Since the difference in distance from 28 and 29 to the terminal 34 can be made smaller than before, each inductance L ₄ ,
The difference in size between L ₅ and L ₆ is also small, making it possible to prevent extreme signal deviation and reducing uneven deterioration, thereby improving the life of the capacitor as a whole.

Furthermore, since the inductances L ₄ , L ₅ and L ₆ are connected in parallel, and the leads are plate-shaped, the overall size of the individual inductances L ₄ , L ₅ and L ₆ is as shown in Figure 5. The inductance value can be made smaller than the current value, and a capacitor element with low inductance can be obtained.

As described above, according to the present invention, a capacitor with improved life span and low inductance can be obtained.

[Brief explanation of the drawing]

Figure 1 is a side view of a conventional capacitor element, Figure 2 is a side view of a conventional capacitor element.
The figure is an equivalent circuit diagram of Figure 1, Figure 3 is a side sectional view of an embodiment of the present invention, Figure 4 is an equivalent circuit diagram of the embodiment of Figure 3, and Figure 5 is a simplified version of Figure 4. An equivalent circuit diagram is shown. 21, 22, 23... Capacitor element, 25... Lead plate, 26... Bottom part, 30... Case, 34... Terminal, 35... Upper end part.

Claims (1)

[Scope of utility model registration request] A capacitor in which a plurality of capacitor elements are integrated and built into a case, the capacitor being provided with a lead plate whose bottom part is connected across the end face of each capacitor element and whose top end is connected to a terminal.