JPS622758Y2 - - Google Patents

Description

[Detailed explanation of the idea]

The present invention relates to an aluminum electrolytic capacitor, and particularly to an aluminum electrolytic capacitor used for acoustic purposes. For example, in a sound reproduction device such as a stereo, by reducing distortion components generated in an audio signal, it is possible to reproduce sound with high fidelity and obtain good sound quality. However, improvements in filter capacitors used in power supplies and speakers have lagged behind other parts, and as a result, they distort audio signals and degrade sound quality, and improvements have been desired. In view of the following points, the present invention aims to provide an aluminum electrolytic capacitor that can reduce distortion components generated in flowing signals. In order to achieve the above object, the present invention provides an aluminum electrolytic capacitor in which a separator is laminated and wound around an aluminum electrolytic foil, which has an etched anode foil and a length of 4 to 20% of the etched anode foil. and an unetched anode foil wound around the outer periphery, an etched cathode foil facing the etched anode foil, and an unetched cathode foil facing the unetched anode foil. The purpose of this project is to provide aluminum electrolytic capacitors. Hereinafter, embodiments of the present invention will be described based on the drawings. In the figure, numeral 1 is an etched anode foil in which an etched aluminum foil is immersed in boric acid or oxalic acid to undergo chemical conversion to form an oxide film on the surface. Reference numeral 2 denotes an unetched anode foil, which is a plain aluminum foil that has not been etched and is cut to a length of 4 to 20% of the length of the etched anode foil 1, and which has been subjected to the same chemical conversion as the etched electrode foil. 3 is a separator such as Manila paper. Reference numeral 4 denotes a cathode foil facing the etched anode foil 1, which is made of aluminum foil that has been subjected to an etching treatment but not subjected to a chemical conversion treatment. 5
is a cathode foil facing the unetched anode foil 2, and is an aluminum foil that has not been subjected to etching treatment or chemical conversion treatment. Then, lead tabs are connected to arbitrary positions of each anode foil 1 and 2, and the capacitor element is formed by winding the anode foil 2 so that the unetched anode foil 2 is located near the outer periphery. For example, when an aluminum electrolytic capacitor with a rating of 63V and 8700 μF was used as a filter capacitor for a stereo, etc., the sound quality of the comparative example and the one according to the present invention was investigated, and the results shown in Table 1 were obtained. The length of each foil shall be: etched anode foil 2030mm, unetched anode foil 160mm, cathode foil facing the etched anode foil 2130mm, and cathode foil facing the unetched anode foil 260mm.

[Table] As is clear from Table 1, the present invention has superior sound quality, particularly sound resolution, and suppresses distortion components, compared to the comparative example. Further, the length of the unetched anode foil is preferably 4 to 20% of that of the etched anode foil, and outside this range the sound quality deteriorates. An example is shown in Table 2. In this case, in order to examine the effect of the length of the anode foil, only the etched cathode foil was used as the cathode foil.

[Table] As is clear from Table 1, by forming a capacitor element in which the etched cathode foil is wound around the etched anode foil, and the unetched cathode foil is wound around the unetched anode foil, the case shown in Table 2 can be achieved. Compared to this, the sound quality can be further improved, and this is thought to be because the loss in the unetched cathode foil can be reduced. As described above, according to the present invention, it is possible to obtain an aluminum electrolytic capacitor that can suppress the distortion component of a flowing signal and improve the sound quality of an audio reproduction device.

[Brief explanation of the drawing]

The figure shows a side view of a laminated state of electrode foils according to an embodiment of the present invention. 1... Etched anode foil, 2... Unetched anode foil, 4... Etched cathode foil, 5... Unetched cathode foil.

Claims (1)

[Scope of utility model registration request] In an aluminum electrolytic capacitor in which a separator is laminated and wound around aluminum electrolytic foil, an etched anode foil and an unetched anode foil having a length of 4 to 20% of the etched anode foil are wound around the outer periphery. an etched cathode foil facing the etched anode foil; and an unetched cathode foil facing the unetched anode foil.