JP3233418B2 - Solid electrolytic capacitors - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solid electrolytic capacitor which is inexpensive and has a simple manufacturing process.

[0002]

2. Description of the Related Art In recent years, with the digitization of electronic devices,
There is an increasing demand for capacitors having good high-frequency characteristics. However, in the case of an electrolytic capacitor using a general electrolytic solution, there is a problem that the capacitance at a high frequency is extremely reduced due to ion conduction, and the specific resistance cannot be extremely reduced. is there. On the other hand, a conventional solid electrolytic capacitor using manganese dioxide or the like does not have the above-mentioned problems, but has a problem in high-frequency impedance because the specific resistance of manganese dioxide is not sufficiently low. Thus, recently, solid electrolytic capacitors using organic semiconductors have been widely studied.

[0003]

Among solid electrolytic capacitors using an organic semiconductor as a solid electrolyte, various technologies using a pyrrole-based conductive polymer as a plate-like electrode foil have been disclosed. However, there is a problem that the cost is increased because a silver paste is used as the cathode. The present invention has been made in view of the above points, and an object of the present invention is to provide a solid electrolytic capacitor whose manufacturing process is simple and whose cost is low.

[0004]

According to the present invention having the above-mentioned object, according to the present invention, there is provided a flat-shaped shade having a cathode lead-out terminal connected to a required portion.
An electrode foil and an oxide film are formed by anodic oxidation,
Flat anode foil with anode lead terminals connected where required
Is insulated with a required space between the cathode foil and the anode foil.
By providing the supporting member, the opposing cathode foil and the positive
Placed at an interval of 10 μm or more between
The space is filled with a solid electrolyte made of conductive polymer
A flat capacitor element is formed, and the capacitor element is
Is sealed to form a capacitor
I have. Fold the cathode foil, this folded cathode
It is preferred to dispose the anode foil between the foils.

[0005]

According to the present invention, a solid electrolytic capacitor can be manufactured without using an expensive silver paste, so that it is inexpensive.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 shows a capacitor element 10. Reference numeral 12 denotes a plate-shaped anode foil, which is made of a commercially available 50 WV conversion foil, connected to the anode lead-out terminal 14 by ultrasonic welding, immersed in a re-formation solution such as an ammonium phosphate aqueous solution, and cut into an anode foil. The surface and the lead portion of the anode lead are formed by a rechemical repair treatment. The cathode foil 16 is also a commercially available etched foil, and after connecting the cathode lead-out terminal 18 , an insulating support member described later on one side is fixed.
Polyphenylene sulfide manufactured by adhesive tape (not shown) are formed by sticking to the site. The cathode foil 16 was folded in two with the adhesive tape side inside as shown in the figure, and the anode foil 12 was interposed between the folded cathode foils 16 and fixed to the cathode foil 16 with the adhesive tape. Both cathode foils 1 sandwiching anode foil 12 by insulating support member 20
6 and the anode foil 12 are set so as to have a predetermined interval. This distance between the anode foil 12 and the cathode foil 16 is 10
The interval should be at least μm.

Subsequently, a methanol solution at -50 ° C. to which 25% by weight of iron (III) dodecylbenzenesulfonate and pyrrole in an amount three times the number of moles of iron (III) dodecylbenzenesulfonate are added. After the capacitor element 10 is immersed and impregnated in the
After standing for minutes, the conductive polymer film was polymerized. Thereafter, the capacitor was washed with methanol, dried at 90 ° C. for 10 minutes, and sealed with a resin to obtain a capacitor. Then 10V at 85 ° C
After applying and aging for 3 hours, the rated voltage was increased to 10
Various characteristics were measured as V.

COMPARATIVE EXAMPLE The same chemical conversion foil as in the example was used as the anode foil, and the connection of the anode lead-out terminal and the re-chemical conversion treatment were performed in the same manner as in the example. Subsequently, the polymer was immersed in a solution of pyrrole 4: tetraethylammonium paratoluenesulfonate 6: methanol 2 and then immersed in an aqueous solution containing 20 wt% of ammonium persulfate and 10 wt% of tetraethylammonium paratoluenesulfonate for 1 hour to carry out polymerization. After polymerization,
After washing with methanol and drying at 90 ° C. for 10 minutes, a silver paste was applied, a cathode lead terminal was connected, and the package was covered with resin to form a capacitor (not shown). Next, aging was performed in the same manner as in the example. Table 1 shows the characteristics of the prototype capacitor.

[0009]

[Table 1]

As is clear from Table 1, it is possible to provide a capacitor whose characteristics are substantially the same as those of the comparative example. In the above embodiment, the cathode foil 16 is folded in two, but two cathode foils may be used. Although various preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and it goes without saying that many modifications can be made without departing from the spirit of the invention. .

[0011]

According to the present invention, a very inexpensive since it does not use a silver paste, also possible to provide a simple solid electrolytic capacitor manufacturing steps since tabular, or
In addition, a separator paper is interposed between the anode foil and the cathode foil.
And an interval is provided, and a conductive polymer is formed within this interval.
Since the solid electrolyte is directly filled, various characteristics can be improved.
Kill in wait.

[Brief description of the drawings]

FIG. 1 is a perspective view of a capacitor element.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Capacitor element 12 Anode foil 14 Anode lead terminal 16 Cathode foil 18 Cathode lead terminal 20 Insulating support member

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-64-74711 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01G 9/04 H01G 9/02 301 H01G 9 / 028

Claims (2)

(57) [Claims] 1. A cathode lead-out terminal is connected to a required portion.
A flat cathode foil and an oxide film formed by anodic oxidation
And a flat plate with the anode lead-out terminal connected to the required location
The anode foil has a required distance between the cathode foil and the anode foil.
And the insulating support member is disposed so as to face each other.
Place at least 10 μm between the cathode foil and the anode foil.
Is placed, and a solid electrolyte made of a conductive polymer is
Filled to form a flat capacitor element,
Check that the capacitor element is sealed and formed on the capacitor.
Characteristic solid electrolytic capacitor. 2. The method according to claim 1, wherein the cathode foil is bent.
Note that the anode foil was interposed between the cathode foils
2. The solid electrolytic capacitor according to claim 1, wherein: