JPS6043811A - Electrolytic condenser - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Application] The present invention relates to electrolytic capacitors, and is particularly intended to reduce electrical noise caused by external vibrations and external sound disturbances. .

[Background technology and its problems]

As shown in Fig. 1, a conventional electrolytic capacitor is mounted on a wiring board 2 using a pair of lead wires and an IB.
There is a configuration that allows you to use it. This electrolytic capacitor 3 has an aluminum shield case 4 having a substantially circular f1; By caulking the case 40 sealing +ft+- material 50 portion from the outside, the member 5 is fixed to the case 4. A capacitor main body 7 having a pair of tab terminals 6A and 6B is disposed at the first position 1 of the case 4, and V1 is set so that the tab terminals 6A and 6B penetrate through the sealing member 5. The distal end portion is fixed in the case 4 by abutting against the inner surface of the distal end portion of the case 4 .

The capacitor body 7 is made up of a pair of aluminum foils, each consisting of an anode foil 11 and a cathode foil 12, with a separator paper 13 made of electrolytic paper impregnated with an electrolytic solution sandwiched therebetween, as shown by the equal side structure in FIG. It has a rolled-up structure, and the ends of the anode foil 11 and cathode foil 12 are fixed by caulking into the mounting holes 15 of the plate parts 14 of the aluminum tab terminals 6A and 6B, as shown in FIG. Tab terminals 6A and 6B are extended downward from the capacitor body 7. The tab terminals 6A and 6B are made by breaking the sleeve part 16 which opens downward from the side opening member 5, and inserting the drawer leads H1h and IB made of copper into the center hole of the sleeve part 16, and attaching the fixing member 1.
8, the lead wire 1 and IB are pulled out downward.

Electrolytic capacitors 3 with such a configuration are often used in audio equipment, but recently, audio amplifiers are mounted on insulators, or stone plates are placed on the audio amplifier casing to prevent disturbances caused by vibration from occurring in the audio amplifiers. Efforts have been made to prevent this from occurring. When considering such strict countermeasures against disturbances, electrolytic capacitors become a problem as one of the noise sources that generate electrical noise in audio amplifiers. Incidentally, as shown in FIG. 4, the disturbances applied to the audio amplifier include vibrations 22 applied via the legs 21 from the mounting table 20 on which the audio amplifier 19 is placed, and vibrations 22 applied to the audio amplifier 1 from the fetus.
A change in the sound pressure of the sound n arriving at 9 is given, and these vibrations and changes in pressure cause the electrical constant of the condenser 3 to fluctuate.

That is, the electric constant of the fju, h4' capacitor 3 having the equal-sided structure shown in FIG. 2 is considered to be configured as follows. The inner surface of the anode foil 11 is chemically etched, for example, to form a coating. 7. ．． 24 is formed as a dielectric between the electrodes, and the other surface of this positive (ζ oxide film) is used as a substantial negative ((alternatively: true cathode), and this true cathode is Electricity is led out from the cathode foil 12 via the separator paper 13 that is in contact with this.However, in practice, the inner surface of the cathode foil 12 is oxidized by natural air and is covered with an oxide film. In the end, the electrical equivalent circuit of the electrolytic capacitor 3 having the configuration shown in FIG. 2 is as shown in FIG.
, the separator paper resistance Re consisting of the resistance of the separator paper itself and the resistance of the electrolyte impregnated therein, the cathode capacity CN of the natural air oxide film 5, and the winding structure of the capacitor body 70 and the cathode as an extraction electrode. 12 inductances are connected in series, and a polarity diode D representing the film polarity (determining the polarity of the electrolytic capacitor 3) is connected in parallel with the anode capacitance CP.

Here, the value of the cathode capacitance CN is actually sufficiently larger than the value of the anode capacitance CP, so that the reactance value can be reduced.

In the equivalent circuit of FIG. 5, the element that is considered to be affected by changes in sound pressure or vibration applied externally to the electrolytic capacitor is the separator paper resistance R8, and this separator paper resistance Re is connected to the anode foil 11 and the cathode foil. The tightening of 12 to separator paper 13 varies as the force changes. The impedance across the electrolytic capacitor 3 relative to the separator paper 13 then changes in response to changes in force, which results in 'electrical noise' being introduced to the signal being processed in the electrolytic etching 3.

Here, the cause of the change in force when tightening the separator paper 13 is as shown in FIG.
In the case where the electrolytic etching 3 attached to the wiring board 26 (fixed to the chassis by the support 27) by B resonates with the vibration of the distribution board 26 and swings in the direction of the arrow, the reaching fl' ! 'The wiring board 2G may be vibrating while the capacitor 3 itself is not vibrating. For example, if we consider the case where the electrolytic capacitor 3 is mounted on a wiring board built into the chassis of an audio amplifier, the Fj'L line board 26 is installed near the chassis of the audio amplifier, as described above with reference to FIG. It is vibrated by changes in the sound pressure from the installed speakers and vibrations transmitted from the legs of the housing. In practice, this vibration is transmitted through the lead glands IA and IB and the tab terminals 6A and 6B to the foils 11 and 1.
2 (FIG. 3), which causes the foils 11 and 12 to vibrate.

In addition, the change in sound pressure is transmitted to the foils 11 and 12 through the shield case 4 and the air within the shield case 4, thereby causing the foils 11 and 12 to vibrate.

While the foils 1'' and 12 vibrate in this manner, the separator paper 13 impregnated with the electrolyte is in a state where its resistance R is easily changed. In other words, the zebalator paper is wrapped between the foils 11 and 12 as shown in Figure 8, but because it is impregnated with electrolyte, the mechanical bond between the fibers is weak (in a swollen state (drying, they become entangled). The strength of foils 11 and 12 against tightening is reduced, and the thickness and bending condition of the separator paper are
And it is in a state where it is susceptible to 12's narrowing shadow chemo. As a result, if vibration is applied to the foils 11 and 12 or deformation such as partial prying force is applied,
It is thought that this directly causes a change in separator paper resistance.

Incidentally, as the separator paper 13 of the electrolytic capacitor 3,
Paper is made by mixing Manila hemp fibers and kraft pulp fibers as a material that satisfies conditions such as good chemical stability against electrolytes, no adverse effects on electrical properties, and good impregnability with electrolytes. It is generally accepted that paper made in the form of a liquid is the best and is widely used, but from the viewpoint of electrical noise, it is still insufficient to impregnate the electrolyte and create a wet state. I can say it.

[Purpose of the invention]

The present invention has been made in consideration of the above points, and aims to minimize the change in separator paper resistance by reinforcing the strength of the separator paper in a swollen state.

[Summary of the invention]

In order to achieve this purpose, in the present invention, reinforcing fibers are added to the separator paper so that the strength will not deteriorate excessively due to swelling of the electrolytic solution, thereby absorbing the vibrations and pressure applied from the electrode foil. do.

〔Example〕

An embodiment of the present invention will be described in detail below with reference to the drawings.

In FIG. 7, reference numeral 31 denotes a separator paper, in which, in addition to Manila hemp fibers and kraft pulp fibers 32 used as constituent materials in conventional separator papers, ceramic fibers are mixed as reinforcing fibers.

Here, the ceramic fibers 33 are Al2O3,5iC (excluding conductive ones), SI3N4 + 5t02
A material of 20·nT10° (for example, 20 TiO2) is used for 1, and the fiber diameter is 0.5 to 10 [μm] (
The fiber length is preferably 1 to 3 [μm]), and the fiber length is 50
~1000 [μm] (preferably 30-50 [μm])
The amount of ceramic fibers used is 5 to 80 in terms of volume ratio.

If the separator paper 31 having the above structure is used, the ceramic fibers have chemically and mechanically stable properties when impregnated with an electrolytic solution, so that the intertwining between the fibers can be reinforced without weakening.

Therefore, as shown in FIG.
Even if vibration or pressure is applied to the electrode foils 11 and 12 when wrapped between electrode foils 11 and 12, the change in separator paper resistance Ite that occurs in response to this will be compared with that of conventional separator paper. It can be made significantly smaller.

In the above-described embodiment, ceramic fibers were mixed with conventionally used manila hemp fibers and kraft pulp fibers, but instead of this, only ceramic fibers may be made into paper. Even in this case, a separator paper with high strength can be obtained as in the case of mixed papermaking.

FIG. 9 shows another embodiment of the present invention, in which the first fiber layer 35 is made of Manila hemp fibers and kraft pulp fibers, similar to conventional separator paper, and the second reinforcing fiber layer is made of ceramic fibers. Separate paper 31 is constructed by laminating layers 36 and 36. In this case, the thickness of the second ceramic fiber layer is selected to be 5 to 10 [μm]. In this way, the vibration or pressure transmitted to the electrode foils 11 and 12 can be absorbed by being received by the second ceramic fiber layer 36, which has a high strength, so that the separator paper resistance Re of the separator paper 31 as a whole
The change in can be made smaller.

10 and 11 are modified examples of FIG. 9, and in the case of FIG. 10, a first fiber layer 380 made of Manila hemp fiber and kraft pulp fiber is coated with a second fiber layer 380 made of ceramic fiber on both sides.
and a structure in which third reinforcing fiber layers 39A and 39B are laminated. In the case of FIG. 11, two fiber layers 41A and 41B made of Manila hemp fiber and kraft pulp fiber are used.
It has an fxM configuration with a reinforcing ceramic fiber layer 42 sandwiched therebetween. Even with this configuration, the same effect as in the case of FIG. 9 can be obtained.

In the above description, as shown in FIG.
The present invention has been described as an example in which the present invention is applied to an electrolytic capacitor supported by an IB. The same effect as described above can also be obtained.

〔Effect of the invention〕

As described above, according to the present invention, by structuring the separator paper with reinforcing fibers having high strength, even if vibration and pressure are transmitted to the electrode foil, changes in the mechanical resistance of the separator can be further reduced. It is possible to easily obtain an electrolytic capacitor with low noise.

[Brief explanation of the drawing]

Figure 1 is a one-sided view showing the configuration of an electrolytic capacitor;
Figure 3 is a side view showing the connection relationship between tab terminals and lead wires, Figure 114 is a route diagram showing noise countermeasures for audio amplifiers, and Figure 5 is a route diagram showing the connection relationship between tab terminals and lead wires. 6 is a calendar diagram showing the vibration mode of an electrolytic capacitor, and FIG. 7 is a route diagram showing separator paper as an embodiment of the commercially available capacitor according to the present invention. , FIG. 8 is a perspective view showing the winding mode,
Figures 9 to 11 show other embodiments of separator paper 1'
The N force surface is ta. LA, IB...lead wire, 3...electrolytic capacitor,
4... Shield case, death... sealing member, 6A, 6B
...Tab terminal, 13, 31...Separator paper, 3
2, 35, 38. ' 41A, 4] 13... Manila hemp fiber and kraft pulp fiber, 33... Ceramic fiber, 36, 3
9A, 39B, 42...Reinforcement fiber layer. Out 1f! f + person agent 1) Megumi Hen Figure 6 Figure 7 Figure 6, etc. Figure 2 / θ Figure 1 / Amendment to Figure Procedures February 1980 Date 1, Incident Indication 1988 Patent Application No. No. 151982 No. 2, Name of the invention Electrolytic capacitor 3, Relationship to the case of the person making the amendment Patent applicant address No. 6-7-35, Kitashinyo, Tokyo Parts Store Name (2
, 1'8) Sony Corporation Representative Norio Ohga (1 idiot) 4. Agent Address: 150 (Telephone: 03-470-6591) 3-22-10 Jingumae, Shibuya-ku, Tokyo Column 6 of "Detailed explanation", content of amendment (1) Specification, page 2, line 9, "aluminum" is changed to "
Aluminum,” he corrected. (2) Same, page 4, lines 11-12, ``Insert ``same, chemical formation'' after ``etching''. N

Claims (1)

[Scope of Claims] 1. An electrolytic capacitor having a structure in which a separator paper impregnated with an electrolytic solution is wound between a pair of electrode foils, characterized in that the separator paper has reinforced fR fibers made of ceramic fibers. Electrolytic capacitor. 2. The electrolytic capacitor according to claim 1, wherein the reinforcing fibers are mixed together with other fibers of the separator paper to form the separator paper. 3. The reinforcing fiber alone forms a reinforcing fiber layer, and the reinforcing fiber layer constitutes part or all of the separator paper.・
icondenser.