JP2965614B2 - Electrolytic capacitor - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an electrolytic capacitor particularly suitable for a power supply rectifier circuit of audio equipment.

2. Description of the Related Art Conventionally, electrolytic capacitors used in power supply rectifier circuits of audio equipment have reduced the equivalent series resistance and increased the number of lead wires drawn out from the electrode foil of the electrolytic capacitors in order to improve the frequency characteristics at high frequencies. What was made into a four-terminal structure and stored in a cylindrical case has been studied.

The capacitor as described above reduces the impedance of the capacitor in a high-frequency band, but has a flat reproduction sound quality in an audio frequency band from low to high when used in a power supply rectifier circuit of audio equipment. Instead, only specific frequencies could be emphasized. For this reason, various studies have been made on the material of the case and the insulating coating material, but no satisfactory material has been obtained.

Means for Solving the Problems The present invention has improved the shape of the case to solve the above-mentioned problems.

That is, (1) the anode electrode foil and the cathode electrode foil are each divided into three or more pairs, and they are opposed to each other with a separator interposed therebetween, and at least one pair of opposed electrode foils of the divided electrode foil is formed using a plain foil. Then, the electrode foil of the opposite one electrode of the three or more pairs of the divided electrode foils is led out from the vicinity of the winding start side, and the electrode foil of the other electrode is led out from the vicinity of the winding end side, and is formed on the capacitor element. An electrolytic capacitor, wherein the element is impregnated with an electrolyte, and is housed and sealed in a bottomed case having a bottom surface formed into a convex or concave curved surface. (2) The bottom surface of the bottomed case is formed in an elliptical shape. (3) An electrolytic capacitor characterized in that the shape of the bottomed case is a truncated cone in which the peripheral length of the case sealing portion is longer than the peripheral length of the bottom outer shell.

Function Since the electrolytic capacitor of the present invention is configured as described above, by configuring at least one pair of plane foils of the divided electrode foil, the distance between the electrode foils can be reduced as compared with the case where only the uneven etching foil is used. Disturbance of the frequency characteristics due to the resonance of.

By leading out the extraction leads from the vicinity of the winding start side of the opposing unipolar electrode foil and the vicinity of the winding end side of the other pole electrode foil, 1) the distance between the lead tabs of the anode foil and the cathode foil is increased, Is clarified, so that the current flowing in the entire area of the electrode foil is equalized (leading to avoidance of resonance).
Further, the ineffectively charged portion of the electrode foil is eliminated.

2) When used on the primary side of the power supply rectifier circuit, the inductance of the capacitor increases, and it functions as a filter that prevents harmonic noise of several kHz or more flowing from the AC line from flowing to the secondary side and beyond.

By forming the bottom surface of the bottomed case into a convex or concave curved surface, the resonance points in the capacitor case are dispersed, so that disturbance in the frequency characteristics is suppressed.

By combining these effects, (a) a wide range of sounds from low to high can be obtained evenly (b) A clear sound with little distortion can be obtained (c) accurate reproduction of small to loud sounds ( D) A loud sound can be output with a small amount of power. (E) The amplifier circuit of the audio device effectively acts on the power supply required instantaneously, and has the effect of improving the noise level. That is, a resonance phenomenon does not occur, and a mode that reflects and resonates at a specific frequency does not occur. Therefore, when used in a power supply rectifier circuit of an audio device, a reproduced sound in an audible frequency band from a low frequency to a high frequency has a flat and high freshness sound quality. . In addition, it is possible to obtain a deep bass sound full of texture and scale, and a high-pitched treble, thereby realizing a power supply rectifier circuit for audio with a rich musicality.

Embodiments The present invention will be described below with reference to the embodiments shown in FIGS.

FIG. 5 is an exploded perspective view of the electrolytic capacitor element according to the present invention, wherein 1a, 2a, 3a and 4a are electrode foils for anodes, 1b, 2b, 3b and 4b.
Is an electrode foil for a cathode, and electrode foils 1a, 2a, and 4a for an anode are aluminum foils subjected to etching and chemical conversion.

The anode electrode foil 3a and the cathode electrode foil 3b are formed using a plain foil without etching treatment, a small-capacity low-loss capacitor is formed, and connected in parallel with a capacitor formed with another electrode foil. You. 5 is a separator such as electrolytic paper, 1c, 2c, 3c and 4c are anode lead foils 1a, 2a, 3a and 4a derived from anode lead, 1d, 2d, 3d and 4d are cathode electrode foils 1b and 2b. , 3b, 4b, the cathode lead, the electrode foils 1a and 1b, 2a and 2b, 3a and 3b, 4a and 4b, respectively, and the anode lead and the cathode lead for the opposing electrode foils. 1c and 1d, 2c and 2d, 3c and 3d, 4c and 4d are arranged at positions near the winding start side and winding end side.

Next, as shown in FIG. 1, the wound capacitor element 6 is housed in a bottomed case 7 made of aluminum metal, and a sealing plate 8 is fitted into the opening of the case 7 to be tightly wound and sealed. .

The bottom surface 7a of the bottomed case 7 is formed in a convex curved surface, and the outer contour 7b of the bottom surface of the case is formed in an elliptical shape. The peripheral length of the case sealing portion outer shell 7c is larger than the peripheral length of the outer shell 7b of the case bottom surface, and is formed in a truncated cone shape. Reference numeral 8 denotes a sealing plate formed by laminating a rubber plate and a baking plate, and the lead leads 1c and 2c for the anode derived from the element 6;
3c and 4c are connected to the anode terminal 9a fixed to the sealing plate 8, respectively, and the cathode lead leads 1d and 2d, 3d and 4d are connected to the cathode terminal 9b fixed to the sealing plate 8 via rivets. Reference numeral 10 denotes a fixing member for the capacitor element.

2 to 4 show another embodiment. In FIG. 2, the bottomed case 11 is formed in a cylindrical shape instead of a truncated cone, and the bottom surface 11a is formed in a convex curved surface. I have. In FIG. 3, the bottomed case 12 further includes a case 12b having an outer shell 12b formed in a perfect circle, and the peripheral length of the case sealing outer shell 12c is larger than the peripheral length of the outer shell 12b of the case bottom 12a. It is formed in a conical shape. In FIG. 4, the bottom 13 of the bottomed case 13 is shown.
a is formed in a concave curved surface, and the others are formed in a truncated cone shape as in FIG.

Next, an electrolytic capacitor having a rated voltage of 50 V, 1500 μF, a case size of 50 mm, and a length of 100 mm was manufactured based on the above-described embodiment, and was mounted on an audio system audition circuit shown in FIG. Compared to the conventional product with a flat bottom, the reproduced sound in the audible frequency band from low to high was flat and high-quality sound was obtained. And it was possible to obtain a deep bass with full texture and scale, and a good treble.

In FIG. 6, 14 is an electrolytic capacitor sample according to the present invention, 15 is a rectifier, 16 is an amplifier, and 17 is a speaker.

In addition to the above-described embodiment, the same effect can be obtained also in the case where the case bottom surface 11a is formed as a concave curved surface in FIGS. 2 and 3. In addition, the same effect can be obtained in the case of the truncated cone in which the case closed side is also made elliptical as well as the bottomed case not only in the case bottom. Further, the present invention can be similarly applied to a small product using a rubber packing instead of the sealing plate.

Effect Since the electrolytic capacitor of the present invention is configured as described above, when used in a power supply rectifier circuit of an audio device, disturbance of frequency characteristics due to resonance is prevented, and (a) a wide range of sounds from low to high tones are evenly distributed. (B) A clear sound can be obtained with little distortion. (C) It has the effect of being able to accurately reproduce from a small sound to a loud sound. 2.) The amplifier circuit of the audio equipment effectively acts on the power supply required instantaneously, and the noise level is also improved.

The effect described above can also be realized. As a result, sound quality rich in musicality can be obtained, and extremely high-fidelity reproduction can be achieved, which can greatly contribute to sound improvement with a sense of realism, and is of great industrial and practical value.

[Brief description of the drawings]

1 to 4 show different embodiments of the electrolytic capacitor of the present invention. FIG. 1 (a) is a plan view, (b) is a front sectional view,
(C) is a side sectional view, (d) is a bottom view, FIG. 2 (a) is a plan view, (b) is a sectional view, FIG. 3 (a) is a plan view, and (b)
Is a sectional view, FIG. 4 (a) is a plan view, (b) is a front sectional view,
(C) is a side sectional view, FIG. 5 is an exploded perspective view of an embodiment of the electrolytic capacitor element of the present invention, and FIG. 6 is an explanatory diagram of a listening circuit of an audio system for evaluating the electrolytic capacitor of the present invention. . 1a, 2a, 3a, 4a: Anode electrode foil 1b, 2b, 3b, 4b: Cathode electrode foil 7, 11, 12, 13: Bottom case 7a, 11a, 12a, 13a: Case bottom surface 7b, 11b, 12b , 13b: Outer shell on bottom of case 7c, 11c, 12c, 13c: Outer shell of case seal

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-50-7058 (JP, A) JP-A-52-31370 (JP, A) Fully open 1983-37127 (JP, U) Really open 1979 171747 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) H01G 9/04 H01G 9/08

Claims (3)

(57) [Claims] 1. An electrode foil for an anode and an electrode foil for a cathode are each divided into three or more pairs, and they are opposed to each other with a separator interposed therebetween. At least one pair of opposed electrode foils of the divided electrode foils is formed using a plain foil. Then, the electrode foil of the opposite one electrode of the three or more pairs of the divided electrode foils is led out from the vicinity of the winding start side, and the electrode foil of the other electrode is led out from the vicinity of the winding end side, and is formed on the capacitor element. An electrolytic capacitor characterized in that the element is impregnated with an electrolyte, housed in a bottomed case having a bottom surface formed into a convex or concave curved surface, and sealed. 2. The electrolytic capacitor according to claim 1, wherein a bottom contour of the bottomed case is formed in an elliptical shape. 3. The electrolytic capacitor according to claim 1, wherein the shape of the bottomed case is a truncated cone in which the peripheral length of the case sealing portion is longer than the peripheral length of the bottom outer shell.