JPS6294911A - Manufacture of toroidal electrolytic capacitor - 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 [Technical Field of the Invention] The present invention relates to a method for manufacturing a wound electrolytic capacitor having a novel configuration.

[Technical blue stone of the invention and its problems] In general, a dry type thin electrolytic capacitor is made of, for example, aluminum foil, and a pair of lead terminals also made of aluminum are connected to a pair of anode and cathode foils, and the pair of positive and negative electrodes 4f! The foil is wound with a spacer interposed between the foils, and then impregnated with a driving electromagnetic liquid, housed in a case, and the opening of the case is sealed.

Generally, the purpose of interposing a spacer is to insulate and isolate a pair of anode and cathode foils and to retain a driving electrolyte, which is an important component in a dry type thin electrolytic capacitor. However, the commonly used spacer is kraft paper, but the kraft paper has a density of 0.3 to 0.8Q/as3.
The density of kraft paper is relatively high, and since the fibers are flattened, the apparent resistivity increases, impairing the tan δ properties.Kraft paper has a thickness of 30 μm due to paper-making technology issues.
m or more, which hinders miniaturization as it cannot be made any thinner, and has drawbacks such as the risk of ignition and continued combustion when the capacitor breaks down due to applied voltage or reverse voltage. Therefore, there is currently a trend to use low-density manila paper instead of kraft paper, which greatly contributes to improving tanδ properties. The thickness must be 4 to withstand the capacitor manufacturing process (especially the winding process).
It was necessary to use a material with a diameter of 0 μm or more, which was still an impediment to miniaturization. Furthermore, since a liquid driving electrolyte is used, there is a limit to the improvement of tan δ characteristics.
Furthermore, the liquid driving electrolyte has problems that need to be solved in practice, such as its specific resistance increases at low temperatures, resulting in extremely poor low-temperature characteristics and lacks reliability when used over a wide temperature range.
It also had the problem of poor frequency characteristics because the lead terminal was stitched in the middle of the anode and cathode foils.

Therefore, in recent years, for example, Japanese Patent Application Laid-open No. 58-17609,
JP-A-58-191414 or JP-A-59-6
As disclosed in Publication No. 3604, instead of the driving electrolyte, N-n-propyl (or N-iso-propyl)
TCNQ complex salts made of isoquinoline, N-ethylisoquinoline, N-n-butylisoquinoline, quinoline whose N-position has been replaced with a hydrocarbon group, isoquinoline, or pyridine have been proposed to have improved properties. However, electrolytic capacitors using such TCNQ 8B salts are generally used by melting and impregnating these TCNQ complex salts, but since the TCNQ complex salts are heated when melting and impregnating them, the conductivity of the TCNQ complex salts decreases. changeable (t
There is a problem with the anδ characteristics, and since the lead terminal is inserted in the middle of the winding as before, the characteristics at high frequencies are poor, and because a spacer is used, the distance between the anode and cathode (approximately 40 to 50 μm) However, there were still problems to be solved, such as a wide range of resistance and a large equal series resistance. Furthermore, the TCNQ complex salt disclosed in the above-mentioned publication was not only difficult to vacuum evaporate, but also had the problem that its temperature characteristics were not very good.

[Object of the Invention] The present invention has been made in view of the above points, and provides a wound type electrolytic device having a novel configuration that solves the above problems at once and provides stable opening performance even when used in a wide temperature range. The object of the present invention is to provide a method for manufacturing a capacitor.

[Summary of the Invention] The method for manufacturing a wound electrolytic capacitor of the present invention involves laminating a valve metal foil on one or both sides of an insulator, and then depositing a TCNQ complex salt on the anodized film formed on the surface of the metal foil. A metal is vacuum evaporated to form an organic semiconductor film, a metal is vacuum evaporated on the organic semiconductor film to form a cathode electrode film to obtain a basic element, and then the basic element is wound to form electrode extension parts on both end faces. It is characterized by

[Embodiments of the invention] An embodiment of the present invention will be described in detail below.

That is, as shown in FIG.
), an aluminum gold layer foil is laminated on one side of the valve metal foil (3) with one end as a margin (2) to form a valve metal foil (3), and then the valve metal foil (3) is anodized to form the valve metal foil (3). An anodic oxide film (4) is formed on the surface of the foil (3), and the margin part (2) is formed on the surface of the rear anodic oxide film (4) excluding the end face located on the opposite side of the margin part (2). For example, 2,2'-bipyridinium (TCNQ) 2,4-hydroxy-N-benzylanilinium (TCNQ)
, 4-amino-2,3,5,6-tetramethylanilinium (TCNQ)2, viridinium (TCNQ)
), 4-cyano-N methyl helidenium (TC
NQ), N-E ethylquinolinium (TCNQ>
, N-(2-phenythyl)quinolinium (TCN
A TCNQ complex salt having Q>2 or the like is vacuum deposited to form an organic semiconductor film (5). Next, a cathode electrode film (6) is formed by vacuum-depositing a metal such as silver, copper, or gold on the surface of the organic semiconductor film (5) excluding the end face located on the opposite side of the margin (2). The basic element (γ) is formed (7).

Then, the basic element (7) is wound as shown in Fig. 1, and both ends are coated with silver or copper paste and dried, or metallized with metal such as zinc, aluminum or solder; (8), an external terminal (9) is attached to the Z1 drawer part (8), and the external terminal (9) is housed in a case or coated with resin or the like to form an exterior (not shown).

According to the method for manufacturing the wound shield capacitor constructed as described above, since the TCNQ complex described above is used in the formation of the organic semiconductor film, vacuum heat r! Since it is not heated unlike the conventional melt impregnation, the conductivity is high (tan δ characteristics are good, and the TC
NQ complex salt has a small change in specific resistance due to temperature change, and since no spacer is used, the resistance between the anode and cathode can be reduced, so it can be used in J3 over a wide temperature range from low to high temperatures.
There are few changes in nδ characteristics, changes in capacitance ω, and changes in leap current characteristics, and unlike conventional examples, the element shape is non-inductive, so impedance characteristics at high frequencies are significantly improved. It has the advantage of having excellent effects.

Next, an example of comparison between an embodiment of the present invention and a conventional reference example will be described.

Example After laminating aluminum foil with a thickness of 10 μm on one side of a polyester film, am[nium adipate 1
Anodic oxidation is performed by applying a voltage of 100 VO in a 0% aqueous solution,
On the anodic oxide film formed on the surface of the aluminum foil by the anodic oxidation, 2,2-bipyridinium (TCNQ
) 2 was vacuum deposited at a temperature of 150°C for 5 minutes to a thickness of 5.
A basic element having the structure shown in Fig. 2 was formed by forming an organic conductor film of 1 µm in thickness, and then vacuum-evaporating Ag on the organic semiconductor film to form a cathode electrode film with a knob size of 5 µm. AQ base 1 is applied to both end faces of the valley turn, dried to form an electrode lead-out part, a lead-out terminal is welded to the electrode lead-out part, and an epoxy resin is coated as an exterior structure, rated at 25 WV, D.
C-0, 1 μF wound type electrolytic capacitor (A> Reference Example: After roughening the surface of the aluminum foil, a positive VMM coating was formed using a manila as a spacer between the anode foil and the cathode foil with the roughened aluminum foil surface. The element is made by rotating paper with paper in between.
Molten and impregnated with TCNQ salt of N-n-probylisonoquinoline, the metal case exterior is rated at 25WV, DC.
-0.1 μF electrolytic capacitor (B) The lead terminal in (B) above has a structure in which the anode and cathode a) are stitched and drawn out.

However, the capacitance 1d change rate J3 and tan with respect to temperature in the above embodiment (A>) according to the present invention and the conventional reference example (B)
The results of investigating δ and furthermore the leakage current were as shown in FIGS. 3 to 5, and the results of investigating the frequency-impedance characteristics were as shown in FIG. 6.

As is clear from FIGS. 3 to 6, Example (A) is more stable than Reference Example (B) in all characteristics.
It has particularly excellent impedance characteristics at high frequencies,
The outstanding effects of the present invention were demonstrated.

Although the above actual fk example uses aluminum foil as the valve metal foil, the same effect can be obtained by using a valve metal foil such as tantalum, titanium, or niobium. can. Furthermore, in each of the above embodiments, the basic element configuration was explained by exemplifying a valve metal foil, an organic semiconductor film, and a cathode electrode film formed only on one side of an insulator. Needless to say, the same effect can be obtained even if

[Effects of the Invention] According to the present invention, a spacer is abolished and stable characteristics are obtained by using a new TCNQ complex salt as an organic semiconductor film, which is a completely new configuration that goes beyond the framework of existing electrolytic capacitor configurations. A method for manufacturing a wound electrolytic capacitor with high practical value can be obtained.

[Brief explanation of drawings]

1 and 2 relate to one embodiment of the present invention; FIG. 1 is a front sectional view showing a wound type electrolytic capacitor, FIG. 2 is a perspective view showing basic elements constituting FIG. 1, and FIG. 4 is a temperature-tan δ characteristic curve, FIG. 5 is a temperature-leakage current characteristic curve, and FIG. 6 is a frequency-impedance characteristic curve. (1)・・・Insulator (2)・・・・・・
Margin area (3)... Valve metal foil (4)...
...Anodized film (5) ...Organic semiconductor film
(6)・・・Cathode electrode film (1)・・・Basic element (8)・・・Electrode pulling part patent applicant
Nagai Electronics Industrial Cooperative Association Figure 1 H Pa "(ゞ) 1 Rescript 'A R("C) Figure 5 Figure 6 Procedures Amendment 1!1 (voluntary) + KIwa 61
May 190 times

Claims (3)

[Claims] (1) A means for laminating a valve metal foil on one or both sides of an insulator, a means for forming an anodic oxide film on the surface of the metal foil, and a means for forming an organic semiconductor film by vacuum depositing a TCNQ complex salt on the oxide film. means for forming a basic element by vacuum evaporating metal on the organic semiconductor film to form a cathode electrode film, and means for winding the basic element to form electrode extension parts on both end faces. A method for manufacturing a wound electrolytic capacitor characterized by: (2) Claim (1) characterized in that the insulator is made of a plastic film or a plastic sheet.
A method for manufacturing a wound type electrolytic capacitor as described in . (3) TCNQ complex salt is 2,2'-bipyridinium (T
CNQ)_2,4-hydroxy-N-benzylanilinium (TCNQ)2, 4-amino-2,3,5,6-tetramethylanilinium (TCNQ)_2, pyridinium (TCNQ)_2
, 4-cyano-N methyl-pyridenium (TCNQ)_
2, N-E ethylquinolinium (TCNQ)_2, N-
A method for manufacturing a wound electrolytic capacitor according to claim (1) or claim (2), characterized in that it is made of (2-phenythyl)quinolinium (TCNQ)_2.