JPS6120742Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to improvements in electrolytic capacitors used in audio equipment and the like.

In recent years, electronic components such as capacitors used in audio systems have been designed with a focus on electrical characteristics.However, with the development of audio technology, not only electrical characteristics but also sound quality in audio systems have been designed. It is well known that evaluation is also becoming more important. Especially in electrolytic capacitors, due to differences in parts, structure, etc.
It is an electronic component with a lot of room for improvement because it has a large effect on the sound quality of audio equipment.

In a conventional electrolytic capacitor, as shown in Fig. 1, the lead plates 1 and 1' are connected to the anode foil and the cathode foil by caulking or other methods, and then the capacitor element 2 is wound by winding the anode foil and the cathode foil through electrolytic paper. Form. Next, the element 2 is impregnated with an electrolytic solution, the lead plates 1, 1' and the terminals 4, 4' attached to the sealing plate 3 are connected, and the element 2 is inserted into a case 5 made of aluminum or the like, and fixed with a compound or the like. A material 6 was injected into the case 4 and the opening of the case 4 was sealed.

When a high-frequency current is passed through such an electrolytic capacitor, generally in the case of a metal case such as aluminum, the loop current is extremely small due to the magnetic flux caused by winding the aluminum electrode of the capacitor element, although it is not as strong as that of magnetic metal. was found to occur at the bottom of the cylindrical metal capacitor case. However, when it comes to sound quality in audio technology, it is well known that loop current is a major cause of distortion in sound quality.In order to eliminate this loop current, the bottom of the cylindrical metal capacitor case was eliminated and a cylindrical metal pipe was used to cover the bottom. Structures formed from rubber baking, resin, etc., and resin cases instead of metal cases are being used, but at present they are faced with many obstacles, such as increased man-hours and the inability to reuse existing equipment.

The present invention has been devised to eliminate the above-mentioned drawbacks, and provides an electrolytic capacitor whose loop current can be easily reduced or eliminated without significantly changing existing equipment or working methods.

In other words, it is known that when graphite is ground, carbon-carbon bonds are broken, causing a large change in magnetic susceptibility and inducing paramagnetism. Taking advantage of the property that heat treatment at 700℃ produces a large difference in magnetic reception, we focused on the characteristics of carbon and the fact that carbon has high conductivity compared to non-metals, and developed a conventional resin case. After impregnating the capacitor element of an electrolytic capacitor housed in the paste with the paste, applying the rated voltage to the electrodes of the element and measuring the potential difference between the top lead extraction side and the bottom side of the element, it was found that at the outer periphery. The potential on the bottom side is high and several mV to several
This method also eliminates the drawback of generating a potential difference of 10 mV, and the present invention will be described below with reference to the embodiment shown in FIG. 2.
The capacitor element 12 is formed by connecting the capacitors 1' by caulking or the like and winding them with electrolytic paper interposed therebetween. The cathode foil is made wide so that it protrudes below the capacitor element 12 when wound.

(b) After impregnating the capacitor element 12 with an electrolytic solution, an elastic body 1 made of soft rubber containing polycrystalline graphite is placed on the bottom of the aluminum case 15.
6 has been inserted.

(c) The capacitor element 12 is housed in the case 15, and a sealing plate 13 having terminals 14, 14' is attached to the case 15, and the opening is tightly sealed.

This is an electrolytic capacitor constructed as described above.

The polycrystalline graphite contained in the elastic body 16 in the above embodiment is optimally ground carbon such as acetylene black, carbon black, and activated carbon.
The above-mentioned soft rubber is a polymer made of isobutylene, isoprene rubber, etc. in an unfluidized state, and is mixed with 20 to 80% by weight of ground carbon.

By configuring the present invention as described above, the magnetic flux generated from the capacitor element perpendicular to the bottom surface of the capacitor case is prevented by the paramagnetism of the ground carbon on the bottom surface of the capacitor case, and is prevented from permeating vertically. Its path is bent and the loop current generated at the bottom of the metal case is reduced or eliminated. This is thought to be due to the carbons acting as an electrostatic shield, and even when a resin case is used, the electrical potential difference on the surface of the element decreases or disappears due to the conductivity of the carbons. Furthermore, the distortion rate characteristics of the electrolytic capacitor of the present invention (rated at 50 WV, 1000 μF) formed as described above and the conventional electrolytic capacitor (rated at 50 WV, 1000 μF) are shown in Figure 3, and A is one implementation of the invented product. In the example, 50% by weight of carbon black is added as ground carbon to unfluidized isobutylene and isoprene rubber, and B is a conventional product. As is clear from the figure, the electrolytic capacitor in which the capacitor element is coated with the solid solution of polycrystalline graphite of the present invention has a significant improvement in distortion rate at 30KHz, and is found to have a remarkable effect. In addition, when the electrolytic capacitor of this invention was installed in the power supply circuit of an audio system and listened to, the three-dimensional effect was improved compared to conventional electrolytic capacitors.
It has been proven that the sound quality is excellent.

As stated above, the electrolytic capacitor of the present invention contains ground carbon such as polycrystalline graphite in the elastic body that fixes the capacitor element, so it can be manufactured efficiently and has sound quality in the range. As the sense of distortion disappears, the bass sounds become quieter and the distortion rate characteristics in the high frequency range are greatly improved. This has a remarkable effect.

[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 one embodiment of the electrolytic capacitor of the present invention, and FIG. 3 is a distortion characteristic diagram of the electrolytic capacitor, where A is a product of the present invention and B is a conventional product. 11, 11'...Drawer lead plate, 12...Capacitor element, 13...Sealing plate, 15...Aluminum case, 16...Elastic body.

Claims (1)

[Scope of utility model registration request] A capacitor element consisting of an anode foil and a cathode foil whose width is wider than the anode foil is housed in a case, and polycrystalline graphite, acetylene black, or carbon black is placed between the cathode foil protruding from the capacitor element and the bottom of the case. An electrolytic capacitor characterized in that a capacitor element is fixed and sealed via an elastic body made of soft rubber containing ground carbon such as activated carbon.