JPS6120748Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a capacitor with an improved external lead.

Capacitors are generally plate-shaped, foil-shaped, metallized,
A capacitor element is formed by interposing a dielectric material such as paper, oil, plastic film, oxide film, ceramic, mica, etc. on a sintered electrode, winding it, laminating it, single layering, etc., and attaching an external lead to the electrode. They are connected by caulking, welding, etc., and are sealed by enclosing them in a dip, molded exterior, metal, or resin case.

Generally, the impedance of a capacitor decreases as the frequency increases, but when a certain frequency is exceeded, the impedance increases due to the influence of the inductance of the electrodes and external leads.

In order to improve the increase in impedance, some metallized film capacitors have a metallized film wound on both sides and metallized at the ends to reduce the dielectric component caused by the winding of the electrode, but the inductance at the external lead lead The impact of this cannot be ignored.

Recently, there has been a demand for electrolytic capacitors with low impedance in the high frequency range used in switching power supplies as shown in FIG.

The present invention aims to reduce the impedance of the capacitor at high frequencies caused by the above-mentioned external lead and to provide a capacitor that can be manufactured at low cost.

That is, the present invention is a capacitor characterized in that external lead terminals are brought into contact with each other or crossed with each other via an insulator, and the inductance due to the influence of flux generated from the external lead terminals of the capacitor is canceled out, and the high frequency impedance is reduced. This causes a decline in

The present invention will now be described with reference to embodiments of aluminum electrolytic capacitors shown in FIGS. 2 to 6.

Figure 2 shows a cross-sectional view of the main parts of an electrolytic capacitor.
In a capacitor in which a capacitor element 1 is housed in a case 2, a sealing member 3 is fitted into the opening of the case 2, and is tightened and fixed together with the case 2, the lead pitch interval is set at a diameter approximately at the center of the sealing member 3. A circular recess 4 is provided, an insulator 6 such as polypropylene tape is placed over the external lead terminal 5 led out from the sealing body 3, and the external lead terminal 5 is bent as shown in FIG. 4, the two external lead terminals 5 are brought into contact with each other so as to face each other or cross each other, and the recessed portion is filled with resin or adhesive 8, and the external lead terminals 5 are fixed. 1 is a capacitor element, and 2 is a case. FIGS. 4A, 4B, and 4C show examples of contact and crossing of the external lead terminals 5 in the recess 4.

Since the capacitor of the present invention is constructed as described above, the inductance between the external lead terminals 5 is reduced, and the impedance characteristics are significantly improved. In addition, the external lead terminal 5 is
As shown in FIG. 2, it is led out through the sealing body 3,
Since it is tightened and fixed together with the case 2 and then bent as shown in Figure 3, mechanical stress is not directly applied to the capacitor element 1 during the bending process, thereby preventing accidents such as wire breakage or increased leakage flow. This is extremely advantageous in terms of productivity.

The impedance characteristics of an aluminum electrolytic capacitor with a rating of 50WV and 220μF according to the present invention are shown in the fifth section.
Figure 6 shows the impedance characteristics of a film capacitor with a rating of 250WV and 10μF.

As is clear from the above results, the capacitor according to the present invention has significantly improved impedance at high frequencies compared to conventional products. In addition, in aluminum electrolytic capacitors, the external lead terminals are bent and hardened with resin, so there is no noise caused by shock or vibration.
Stable properties were obtained even in tests at high temperatures.

In addition, for small capacitors with a case diameter of 8 mm or less, the weight of the product itself is light, so the fourth
The same effect as described above can be obtained by simply bending the external lead terminals 5 and touching and crossing each other as shown in FIGS.

As mentioned above, the capacitor of the present invention has a simple structure and significantly improves impedance characteristics, and has great practical value.

[Brief explanation of the drawing]

Figure 1 is a sectional view of a conventional electrolytic capacitor, Figure 2 is a cross-sectional view of a conventional electrolytic capacitor.
The figure is a sectional view of a main part of an electrolytic capacitor according to an embodiment of the present invention, FIG. 5 and 6 are impedance characteristic diagrams of the capacitor. 5... External lead terminal, 6... Insulator.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A capacitor in which a capacitor element 1 is housed in a case 2, a sealing member 3 is fitted into the opening of the case 2, and is tightened and fixed together with the case 2. One of the two external lead terminals 5 led out from 3 is coated with a thin insulator 6,
Bend the two external lead terminals 5 mentioned above,
A capacitor characterized in that the capacitors are arranged in contact with each other, facing each other or crossing each other. (2) The capacitor according to claim 1 of the utility model registration, characterized in that the opposing contact or contact crossing portions of the external lead terminals 5 are filled with resin or adhesive.