JPH042111A - Solid electrolytic capacitor - Google Patents

Abstract

PURPOSE:To extract a plurality of electrostatic capacitance while using an electrolytic layer as a unit, and to manufacture a solid electrolytic capacitor, capacitance of which is increased and adjusted easily, by manufacturing a capacitor element by folding an anode body, to which a plurality of electrolytic layers employing a solid electrolyte are formed, while interposing an insulating sheet. CONSTITUTION:One tabular anode body 10 is used, and the anode body 10 is formed of a valve metal such as aluminum. Electrolytic layers 16A, 16B using solid electrolytic layers as units are formed onto the anode body 10 bent in a U shape including the anode body 10, and anode terminals 8A, 8B are fitted independently onto each electrolytic layer 16A, 16B. Insulating sheets 18 insulating each of the electrolytic layers 16A, 16B and cathode terminals 8A, 8B are interposed between each electrolytic layer 16A, 16B and between the cathode terminals 8A, 8B, and constituted as one capacitor element 12 by the anode body 10 bent while interposing a sealing resin 20. Electrostatic capacitance CA is extracted between an anode terminal 6 and the cathode terminal 8A and electrostatic capacitance CB between the anode terminal 6 and the cathode terminal B respectively in the capacitor element 12.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a solid electrolytic capacitor using a solid electrolyte such as an organic conductive polymer in an electrolyte layer.

[Conventional technology]

Conventionally, due to the demand for miniaturization of electronic circuits, especially hybrid integrated circuits, it has been expected that electrolytic capacitors will be miniaturized and made into chips. There is a capacitor.

In this solid electrolytic capacitor, for example, an aluminum plate is used as the anode body, the surface of which is etched to form a corrugated surface, a dielectric layer is formed on the surface by electrolytic treatment, and an organic layer is formed on the top surface of this dielectric layer. A device in which an electrolyte layer is formed by growing a semiconductor layer is known.

[Problem to be solved by the invention]

By the way, such solid electrolytic capacitors have the same structure as conventional solid electrolytic capacitors in principle, but in order to realize them as highly reliable devices based on electrical characteristics such as low impedance, it is necessary to There are various problems with taking out the electrodes, etc.

In particular, a solid electrolyte layer and a cathode body are formed on a dielectric layer selectively formed on a substrate forming an anode body, and since a conductive polymer is used for this solid electrolyte, this cathode body It is very difficult to take out the cathode terminal for the
There are disadvantages such as increasing connection resistance in terminal connection and decreasing reliability of connection.

Further, even if the capacitor element itself is miniaturized, the terminal structure becomes complicated and the terminal occupies a large volume with respect to the solid electrolytic capacitor, resulting in disadvantages such as a decrease in volumetric efficiency in forming the capacitance.

Furthermore, solid electrolytic capacitors are required to have improved heat resistance against solder reflow, moisture resistance to prevent deterioration due to moisture in the air, and improved productivity to reduce production costs. There is.

Therefore, the present invention aims to simplify the structure for taking out the electrode terminal,
The purpose of the present invention is to provide a solid electrolytic capacitor that has enhanced protection of the electrolyte layer, increased capacity, and simplified capacity adjustment.

[Means to solve the problem]

That is, in the solid electrolytic capacitor of the present invention, an anode body (10) on which a plurality of electrolyte layers (16A, 16B) using a solid electrolyte are formed, and cathode terminals (8A, 8B) individually placed on the electrolyte layer. At the same time, an insulating sheet (1B) that insulates the electrolyte between the eyebrows and the cathode terminal is interposed and folded to form a capacitor element (12), and a plurality of electrolyte layers are formed between the anode body and the cathode terminal as a unit. This provides independent capacitance (CA, CB).

[For production]

In the solid electrolytic capacitor of the present invention, a plurality of electrolyte layers using a solid electrolyte are formed on the surface of an anode body, a cathode terminal is installed on top of the electrolyte layer, and an insulating sheet is interposed to insulate between the solid electrolyte eyebrows and the cathode terminal. Then, by folding the anode body with the solid electrolyte layers facing each other, a single capacitor element is obtained. Therefore, the electrolyte layer is sandwiched and protected between the anode bodies, and
Since cathode terminals are formed independently for each electrolyte layer, capacitance is taken out between each cathode terminal and each electrolyte layer using a solid electrolyte, using the anode body as a common anode terminal.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings.

FIG. 1 shows an embodiment of the solid electrolytic capacitor of the present invention.

As shown in FIG. 1A, this solid electrolytic capacitor has a rectangular parallelepiped shape, and its outer surface is covered with a synthetic resin layer 2. An anode terminal 6 is formed on one end face in the longitudinal direction, and an anode terminal 6 is formed on the other end face part in the longitudinal direction.
2 for taking out the capacitance individually between the anode terminal 6
Two cathode terminals 8A and 8B are formed, and the anode terminal 6 and the cathode terminals 8A and 8B are extended toward the bottom side and are formed as external connection terminals that can be face bonded.

As shown in FIG. 1(B), this solid electrolytic capacitor uses a single plate-shaped anode body 10, and this anode body 10 is made of a valve metal such as aluminum.

On the anode body 10 bent in a U-shape, there is an anode body 10
Electrolyte layer 16A, 1 including solid electrolyte layer as a unit
6B, and cathode terminals 8A, 8B are independently installed on each electrolyte layer 16A, 16B. An insulating sheet 18 is interposed between each electrolyte layer 16A, 16B and between cathode terminals 8A, 8B, and the anode body 10 is bent with a sealing resin 20 interposed therebetween.
It is configured as one capacitor element 12. Further, on the back side of the anode body 10, an anode terminal 6 is installed with a conductive adhesive 22.

By the way, as shown in FIG. 2, the anode body 10 for constituting the capacitor element 12 has an electrolyte layer 16A having a rectangular shape on its surface within the range demarcated by the insulating layer 14;
16B is formed, and L-shaped plate-shaped cathode terminals 8A, 8B are installed on the upper surface of each electrolyte layer 16A, 16B, and cathode terminals 8A, 8B are provided between the electrolyte layers 16A, 16B on the electrolyte layer 16A side. A rectangular insulating sheet 18 made of synthetic resin is installed to insulate between 8B.

Then, this anode body 10 is folded with the cathode terminals 8A, 8B and the insulating sheet 18 sandwiched between them, and the flat anode body 10
One capacitor element 12 is formed by these.

As shown in FIG. 3, each electrolyte layer 16A, 16B is formed by forming a dielectric layer 161 on the etched anode body 1° by chemical conversion treatment, and then applying vapor phase polymerization, chemical polymerization, or electrolytic polymerization to the dielectric layer 161. A solid electrolyte layer 162 made of a polymer film such as polypyrrole is formed by this process, and a carbon paste 164 and a silver paste 166 are formed by printing or the like on the upper surface of the solid electrolyte layer 162, and conductive adhesive is applied thereon to connect each cathode terminal 8A, 8B. A chemical layer 168 is formed.

That is, in the capacitor element 12, the solid electrolyte layer 16
Carbon paste 164 and silver paste 166 laminated on 2 constitute a substantial cathode.

With such a configuration, each of the electrolyte layers 16A and 16B formed on the common anode body 10 has a cathode terminal 8A.
, 8B are installed, and as shown in the fourth section, electrolyte layers 16A and 1.6B are formed using a solid electrolyte layer 162 between the anode terminal 6 and the cathode terminals 8A and 8B. Capacitance CA, C! Since the capacitance CA and the anode terminal 6A are formed between the anode terminal 6 and the cathode terminal 8A,
The capacitance Cm is taken out individually between and the cathode terminal 8B. When the cathode terminals 8A, 8B are connected in common, each capacitance CA, C! between the anode terminal 6 and the common cathode terminals 8A, 8B! Since l is parallelized, the capacitance C to be taken out can be increased.

Since the surface of each electrolyte layer 16A, 16B is covered and protected by the bent anode body 1O, together with the filling of the sealing resin 20, each electrolyte layer 16A,
The moisture resistance of 16B is enhanced.

In addition, in the embodiment, a case was explained in which a pair of electrolyte layers were formed on the anode body, but the present invention can also be applied to a case where three or more electrolyte layers are formed and one capacitor element is constructed by overlapping them. It is possible.

〔Effect of the invention〕

As explained above, according to the present invention, the following effects can be obtained.

(a) Multiple electrolyte layers using a solid electrolyte are installed on the anode body, multiple capacitances can be taken out using the electrolyte layer as a unit, and the anode body is folded to protect the electrolyte layer. This improves moisture resistance and improves the reliability of solid electrolytic capacitors.

(b) The cathode terminal is sandwiched between the eyebrows of the electrolyte along with an insulating sheet, making it easy to pull out the cathode terminal, and the stress acting on the anode body can be absorbed by the insulating sheet, making the solid electrolytic capacitor resistant to impact. I can donate.

(C) By sharing the cathode terminal drawn out for each electrolyte layer, the capacitance formed in each electrolyte layer can be parallelized, and a large capacity can be realized.

[Brief explanation of drawings]

Fig. 1 shows an embodiment of the solid electrolytic capacitor of the present invention, (A) is a perspective view thereof, (B) is a sectional view taken along the line I-Is of (A), and Fig. 2 is the same as shown in Fig. 1. Figure 3 is an enlarged sectional view of the anode body of the solid electrolytic capacitor shown in Figure 1. Figure 4 shows the equivalent circuit of the solid electrolytic capacitor shown in Figure 1. It is a circuit diagram. 6... Anode terminal 8A, 8B... Cathode terminal 10... Anode body 12... Capacitor element 16A, 16B... Electrolyte layer 18... Insulating sheet 162... Solid electrolyte layer CA, C+t ...Capacitance diagram Figure (B) Figure

Claims (1)

[Claims] A capacitor element is produced by folding an anode body on which a plurality of electrolyte layers using a solid electrolyte are formed, individually with a cathode terminal on the electrolyte layer, and interposing an insulating sheet that insulates between the electrolyte layers and between the cathode terminals. A solid electrolytic capacitor, wherein a plurality of independent capacitances are obtained between the anode body and the cathode terminal using the electrolyte layer as a unit.