JPH07302738A - Structure of compound element constituted of solid electrolytic capacitor and coil - Google Patents

Abstract

PURPOSE:To constitute a solid electrolytic capacitor and a coil in an unified body, without increasing the size, in the state that a capacitor element of the solid electrolytic capacitor is protected. CONSTITUTION:An insulating multilayered cylinder 2 is formed by laminating a plurality of ring type insulating boards 2a. A coil pattern 3 of a plurality of windings formed by connecting the start end part and the terminal end part of a conductor pattern 3a is formed on each of the insulating boards, in the mutual part between adjacent insulating boards. The coil patterns 3 are arranged in the insulating multilayered cylinder 2. The capacitor element 1 of a solid electrolytic capacitor is inserted in the insulating multilayered cylinder 2 and unified in a body, on which at least two electrode terminals 5, 7 for connection are formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a composite element comprising a solid electrolytic capacitor such as a tantalum solid electrolytic capacitor or an aluminum solid electrolytic capacitor, and a coil connected in series or in parallel with the solid electrolytic capacitor. It is a thing.

[0002]

2. Description of the Related Art Generally,
Since this type of solid electrolytic capacitor has a large capacity and a small size, it has recently been used in various electric devices. However, when this solid electrolytic capacitor is used in an electric device, the dielectric film in the capacitor element of the solid electrolytic capacitor causes dielectric breakdown due to an inrush current generated when the switch of the electric device is turned on and off. May occur.

Therefore, in order to prevent dielectric breakdown due to inrush current generated by turning on / off the switch, etc., a coil should be connected to either the anode side or the cathode side of the solid electrolytic capacitor for use. Is done. In various electric devices, various electric circuits such as a filter circuit may be configured by combining the solid electrolytic capacitor and the coil in series or in parallel.

However, conventionally, a solid electrolytic capacitor and
Since the coil and other parts are separate parts,
When used in combination with electrical equipment as described above, the solid electrolytic capacitor and the coil must be separately mounted on a printed circuit board or the like in the electrical equipment. Not only is the number of steps increased, but it is necessary to separately provide a space for mounting both of them, which leads to an increase in the size of a printed circuit board and the like, and an increase in the size of electric equipment.

The present invention provides a solid electrolytic capacitor such as a tantalum solid electrolytic capacitor, a coil for protecting the solid electrolytic capacitor against an inrush current, or various circuits such as a filter circuit together with the solid electrolytic capacitor. Technically, it is an object of the present invention to provide a composite element in which a coil for constituting the same is integrated under the condition that the capacitor element in the solid electrolytic capacitor can be protected against impact or the like without causing an increase in size. This is an issue.

[0006]

In order to achieve this technical object, the present invention provides: "Inside an insulating laminated cylinder formed by laminating a plurality of ring-shaped insulating plates, on the surface of each ring-shaped insulating plate. A plurality of winding coil patterns are formed by electrically connecting the starting end portion and the terminating end portion of the conductor pattern formed so as to extend in the circumferential direction between mutually adjacent ring-shaped insulating plates. Inside, the capacitor element in the solid electrolytic capacitor, one end of the two poles of the capacitor element is electrically connected to one end of the coil pattern, or both ends of the capacitor element are connected to both ends of the coil pattern. It is inserted so as to be electrically connected and integrated, and at least two connecting electrode terminals are provided on this. "

[0007]

[Operation] With this configuration, the coil is formed by stacking a plurality of ring-shaped insulating plates.
While the structure can be relatively simple, the space inside the coil can accommodate the capacitor element in the solid electrolytic capacitor. In other words, the space inside the coil is provided with the capacitor element. Since it can be effectively used, it can be mounted on a printed circuit board or the like in an electric device with at least two connecting electrode terminals, but it is possible to increase the size when the solid electrolytic capacitor and the coil are integrated. It can be avoided.

Further, since the capacitor element is housed in the insulating laminated cylinder forming the coil, the capacitor element can be protected by the insulating laminated cylinder.

[0009]

Therefore, according to the present invention, a composite element in which a solid electrolytic capacitor and a coil used for protecting the solid electrolytic capacitor or used together with the solid electrolytic capacitor are integrated. Is small and can be mounted on a printed circuit board, etc.
It has an effect that the capacitor element in the solid electrolytic capacitor can be provided in a protected form.

Further, by constructing as in "claims 2 to 4," the function of the temperature fuse for the solid electrolytic capacitor can be easily achieved without causing the composite element to become large in size. It can be added.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 5 show a first embodiment. In this figure, reference numeral 1 denotes a capacitor element in a solid electrolytic capacitor, which is obtained by solidifying and sintering metal powder such as tantalum, and forming a dielectric film and then a solid electrolyte layer on the surface of the metal powder. And a positive electrode terminal 1b protruding from one end surface of the chip piece 1a,
The cathode film 1c is formed on the surface of the chip piece 1a.

Further, reference numeral 2 indicates an insulating laminated cylinder, and the insulating laminated cylinder 2 has a plurality of insulating plates 2a such as synthetic resin films formed in a ring shape as shown in FIG. It is constituted by laminating and sandwiching and interposing, or integrating each insulating plate 2a while heat-welding each other, and formed inside the ring-shaped insulating plate 2a so as to extend in the circumferential direction thereof. A plurality of winding coil patterns 3 are provided by electrically connecting the starting end portion 3a 'and the terminating end portion 3a "of the formed conductor pattern 3a between adjacent ring-shaped insulating plates 2a via through holes 3b. ing.

Then, while inserting the capacitor element 1 into the insulating laminated cylinder 2 and fixing it with an adhesive or the like,
A terminal plate 4 made of an insulating material such as synthetic resin is laminated on one end surface of the insulating laminated cylinder 2 so that the anode terminal 1b of the capacitor element 1 protrudes from a hole 4a formed in the terminal plate 4. Then, it is fixed with an adhesive or the like. On the surface of the terminal plate 4, an anode-side connecting electrode terminal 5 electrically connected to the anode terminal 1b of the capacitor element 1 is formed by applying a conductive paste and nickel plating on the surface. A cathode-side connecting electrode terminal 7 is formed by solder plating or the like and is electrically connected to one end of the coil pattern 3 having a plurality of turns through a through hole 6 in the terminal plate 4, by applying a conductive paste. And the surface thereof is formed by solder plating using nickel plating as a base.

On the other end surface of the insulating laminated cylinder 2, a conductor film 8 for electrically connecting the through hole 3c to the other end of the coil pattern 3 of a plurality of turns and the cathode film 1c of the capacitor element 1 is formed. To provide. In addition, a portion of the outer surface of the insulating laminated cylinder 2 excluding the connecting electrode terminals 5 and 7 is a coating film 9 made of an insulating material such as synthetic resin.
It is covered by.

With such a configuration, the equivalent circuit of this composite element has a form in which the coil pattern 3 of a plurality of turns is connected in series to the cathode side of the capacitor element 1, as shown in FIG. . Then, the insulating laminated cylindrical body 2 having the coil pattern 3 of a plurality of windings built therein can be configured relatively easily by laminating a plurality of ring-shaped insulating plates 2a. The capacitor element 1 in the solid electrolytic capacitor can be housed in the internal space.

When forming the conductor pattern 3a on the surface of each ring-shaped insulating plate 2a, a metal paste may be formed by screen printing, or a metal film may be formed by vacuum deposition. In the first embodiment, the terminal plate 4 is laminated on the other end surface of the insulating laminated cylindrical body 2 and connected to the cathode film 1c of the capacitor element 1 for connecting to the cathode side. While providing an electrode terminal and an anode-side connecting electrode terminal that conducts to one end of the coil pattern 3, the anode terminal 1b of the capacitor element 1 and the other end of the coil pattern 3 are electrically connected to each other on one end face of the insulating laminated cylinder 2. Of the coil element 3 is connected in series to the anode side of the capacitor element 1 to form a composite element of a form in which the coil pattern 3 is connected in series. It is the can.

In the case of the first embodiment, the conductor patterns 3a of all the ring-shaped insulating plates 2a are formed of a low melting point metal such as solder, or a part of each ring-shaped insulating plate 2a is used. By forming the conductor pattern 3a of the ring-shaped insulating plate 2a with a low melting point metal such as solder, the conductor pattern 3a made of the low melting point metal melts down due to a rise in temperature. The function of can be added.

6 to 8 show a second embodiment. In the second embodiment, the other end surface of the insulating laminated cylindrical body 2 in the first embodiment is provided between the two insulating plates 10a and 10b.
A fuse body 10 in which a fuse pattern 10c made of a low melting point metal such as solder is formed by screen printing or vacuum deposition is used. One end of the fuse pattern 10c is a cathode film 1c of a capacitor element 1 and the other end is a coil pattern having a plurality of turns. After being laminated so as to be electrically connected to the through hole 3c for the other end of the sheet 3, the sheet is fixed with an adhesive or the like.

As a result, the equivalent circuit of this composite element has a form in which, as shown in FIG. 8, a plurality of turns of the coil pattern 3 is connected in series to the cathode side of the capacitor element 1 via the fuse pattern 10c. become,
The function of the thermal fuse can be added by the fuse pattern 10c. In the third embodiment shown in FIG. 9, the anode-side connecting electrode terminal 5 and the anode terminal 1b in the capacitor element 1 and a plurality of windings are wound on the surface of the terminal plate 4 laminated and fixed to one end surface of the insulating laminated cylinder 2. While being provided so as to be electrically connected to the through hole 6 for one end of the coil pattern 3 at the same time, the cathode side connecting electrode terminal 7 is connected to the cathode film 1c of the capacitor element 1 on the other end surface of the insulating laminated cylinder 2. , Is provided so as to be electrically connected to the through hole 3d for the other end of the coil pattern 3 having a plurality of turns at the same time.

With this structure, it is possible to form a composite element in which the capacitor element 1 and the coil pattern 3 of a plurality of turns are connected in parallel as in the equivalent circuit shown in FIG. Also in the case of the third embodiment, as in the case of the first embodiment, the conductor patterns 3a in all the ring-shaped interstitial plates 2a are formed of a low melting point metal such as solder, or A function of a thermal fuse is added to the series-connected composite element by forming the conductor pattern 3a of a part of the ring-shaped insulating plate 2a with a low melting point metal such as solder. You can

Further, as in the fourth embodiment shown in FIG. 11, a fuse body 10 constructed in the same manner as in the second embodiment is provided on the other end surface of the insulating laminated cylindrical body 2 at one end of its fuse pattern 10c. Is fixed so as to be connected to the cathode film 1c in the capacitor element 1 and the through hole 3c for the other end of the coil pattern 3 of a plurality of turns via the conductor film, and on the surface of the fuse body 10, for connecting the cathode side. The electrode terminal 7 is provided so that the cathode-side connecting electrode terminal 7 is connected to the other end of the fuse pattern 10c.

As a result, as in the equivalent circuit shown in FIG. 12, the capacitor element 1 and the coil pattern 3 having a plurality of turns are connected in parallel, and a composite element having a function of a temperature fuse is added. In this case, instead of providing the fuse body 10 on the cathode side of the capacitor element 1, the fuse body 10 may be provided on the anode side.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view showing a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is an exploded perspective view of the first embodiment.

FIG. 4 is an exploded perspective view of an insulating laminated cylinder.

FIG. 5 is an equivalent circuit diagram of the first embodiment.

FIG. 6 is a vertical sectional front view showing a second embodiment.

FIG. 7 is an exploded perspective view of the second embodiment.

FIG. 8 is an equivalent circuit diagram of the second embodiment.

FIG. 9 is a vertical sectional front view showing a third embodiment.

FIG. 10 is an equivalent circuit diagram of the third embodiment.

FIG. 11 is a vertical sectional front view showing a fourth embodiment.

FIG. 12 is an equivalent circuit diagram of the fourth embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Capacitor element 1a Chip piece 1b Anode terminal 1c Cathode film 2 Insulating laminated cylinder 2a Ring-shaped insulating plate 3 Coil pattern 3a Conductor pattern 4 Terminal plate 5 Anode side connecting electrode terminal 7 Cathode side connecting electrode terminal

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location H01G 9/004 9174-5E H01G 4/40 321 Z 9/05 Z

Claims (4)

[Claims] 1. A starting end portion and a terminating end portion of a conductor pattern formed on the surface of each ring-shaped insulating plate so as to extend in the circumferential direction inside an insulating laminated cylinder formed by stacking a plurality of ring-shaped insulating plates. A coil pattern of a plurality of turns formed by electrically connecting between and adjacent ring-shaped insulating plates,
Inside the insulating laminated cylinder, the capacitor element in the solid electrolytic capacitor is electrically connected to one of the poles of the capacitor element at one end of the coil pattern, or the capacitor element of the capacitor element is connected to both poles of the capacitor element. A structure of a composite element of a solid electrolytic capacitor and a coil, characterized in that both ends of a coil pattern are inserted and integrated so as to be electrically connected, and at least two connecting electrode terminals are provided on this. 2. The solid electrolysis according to claim 1, wherein each of the conductor patterns forming the coil pattern of a plurality of turns or a part of the conductor patterns is made of a low melting point metal such as solder. Structure of composite element of capacitor and coil. 3. The fuse body according to claim 1, wherein a fuse pattern made of a low melting point metal such as solder is formed between two insulating plates on the insulating laminated cylinder body, A structure of a composite element of a solid electrolytic capacitor and a coil, wherein one pole of a capacitor element and one end of a coil pattern are laminated so as to be electrically connected by a pattern. 4. The fuse body according to claim 1, wherein a fuse pattern made of a low melting point metal such as solder is formed between two insulating plates on the insulating laminated cylindrical body, One of the both ends of the pattern is laminated so that one end is electrically connected to one pole of the capacitor element and the other end is electrically connected to one connecting electrode terminal, respectively. Construction.