JPS5934994Y2 - Electrolytic capacitor - 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 primarily with an emphasis on electrical characteristics.However, as audio technology develops, not only electrical characteristics but also electrical characteristics have become important in audio systems. It is well known that emphasis has been placed on the evaluation of sound quality.

Regarding electrolytic capacitors, the sound quality of audio equipment is greatly affected by differences in components, structure, etc.
It is an electronic component with a lot of room for improvement.

In a conventional electrolytic capacitor, as shown in Fig. 1, an external lead terminal 1 is connected to an anode foil and a cathode foil by a method such as force tightening, and then the capacitor element 2 is formed by winding it with electrolytic paper interposed therebetween. do.

Next, the element 2 was impregnated with an electrolytic solution, a sealing member 3 made of rubber or the like was attached, and the element 2 was inserted into a case 4 made of aluminum or the like, and the opening of the case 4 was sealed.

When a high frequency current is passed through such an electrolytic capacitor,
In general, in the case of a metal case such as aluminum, although it is not a magnetic metal, it has been found that an extremely small loop current is generated at the bottom of the cylindrical metal capacitor case due to the magnetic flux caused by winding the aluminum electrode of the capacitor element.

However, with regard to sound quality based on acoustic technology, it is well known that loop current is a major cause of distortion in sound quality. Structures in which the bottom part is formed using rubber baking or resin, and resin cases are used instead of metal cases, but these are currently faced with many obstacles such as increased man-hours and the inability to reuse existing equipment. It is.

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°C causes a large difference in magnetic receptivity, we focused on the characteristics of carbon and the fact that carbon has high conductivity compared to non-metals, and we have developed a conventional resin case. When applying the rated voltage to the electrode of the post-reading element in which the capacitor element of the housed electrolytic capacitor is impregnated with paste and measuring the potential difference between the top lead-out side and the bottom side of the element, it is found that the outer periphery This eliminates the drawback that the lower surface side has a high potential and a potential difference of several mV to several tens of mV.If we explain the Danshitagi idea with reference to the embodiments shown in Figures 2 and 3, The figure is a perspective view of a capacitor element, and Figure 3 is a cross-sectional view of an electrolytic capacitor. 11 is an external lead terminal, 12 is an electrode tab, 13 is a sealing plate, 14 is a case, 15 is a capacitor element, and 16 is an anode electrode foil. Reference numeral 17 indicates a cathode electrode foil, 18 indicates a separate rake, and the cathode electrode foil 11 and the cathode electrode are formed by forming irregularities on the surface of the cathode electrode foil 1T by etching and adhering ground polycrystalline graphite to the irregular surface. The electrode tab 12 is connected to the foil 11 button and the anode electrode foil 16 by crimping or the like, and is wound through a separator 18 such as electrolytic paper to form a capacitor element 15.

Next, the element 15 is housed in a case 14, the electrode tabs 12 are connected to the terminals 11 of the sealing body 13, and the open end of the case 14 is wrapped and sealed to form an electrolytic capacitor.

Note that 19 is a fixing material for fixing the capacitor element 15 and is a solid solution such as attack polypropylene.

In the above embodiments, the ground carbon to be attached to the uneven surface of the cathode electrode foil is not limited to polycrystalline graphite, but may also be carbon black, acetylene black, activated carbon, etc. The coating is not limited to the cathode electrode foil, but may be applied to the anode electrode foil if necessary.

For cathode electrode foils used for buttons, high voltages, etc., ground graphite may be attached to the surface to make it smooth without etching the surface to form irregularities.

By configuring the present invention as described above, the magnetic flux perpendicular to the bottom surface of the capacitor case generated by the capacitor element is absorbed by attaching ground carbon to the uneven surface provided on the surface of the cathode electrode foil of the capacitor element. The loop current generated at the bottom of the metal case is reduced or eliminated, and its path is bent instead of passing vertically.

This is thought to be due to the carbons acting as an electrostatic shield, and when a resin case is used, the potential difference on the element surface decreases or disappears due to the carbons being conductive even if ViC is removed. do.

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 Fig. 4, where A indicates the product of the present invention, and This is a conventional product.

As is clear from the figure, the electrolytic capacitor in which the capacitor element is coated with the polycrystalline graphite solid solution of the present invention is 30KH7
It can be seen that the distortion rate in , is significantly improved, and there is a remarkable effect.

When the electrolytic capacitor of this invention like this one was installed in the power supply circuit of an audio system and listened to, it was proven that the three-dimensional effect was improved and the sound quality was superior compared to conventional electrolytic capacitors. .

As mentioned above, the electrolytic capacitor of the present invention has polycrystalline graphite attached to at least the surface of the cathode electrode foil of the capacitor element, so the sound quality is improved so that there is no distortion in the sound range and the low frequency sound is high. Moreover, the distortion rate characteristics in the high frequency range are greatly improved, and the third harmonic is significantly reduced, and when used in audio systems, various audio transmission systems, etc., it produces a remarkable effect of high fidelity.

[Brief explanation of the drawing]

Figure 1 is a sectional view of a conventional electrolytic capacitor, Figure 2 is a partially exploded perspective view of an electrolytic capacitor element of the present invention, Figure 3 is a sectional view of an embodiment of an electrolytic capacitor of the present invention, and Figure 4 is an electrolytic capacitor element of the present invention. In the distortion rate characteristic diagram of the capacitor, A is the inventive product, and A is the conventional product. 11... External lead terminal, 12... Electrode tab,
13... Sealing plate, 14... Aluminum case, 1
5... Capacitor element, 16... Anode electrode foil, 17
... Cathode electrode foil, 18... Separator.

Claims (2)

[Scope of utility model registration request] (1) Ground carbon such as polycrystalline graphite, acetylene blank, carbon black, activated carbon, etc. is adhered to the surface of the cathode electrode foil, and a separator such as electrolytic paper is placed between the cathode electrode foil and the anode electrode foil. An electrolytic capacitor is made by wrapping a capacitor element in a case and sealing it. (2) The electrolytic capacitor according to claim 1, which is a registered utility model, characterized in that the surface of the cathode electrode foil is etched to form irregularities.