JP2921416B2 - Solid electrolytic capacitor and method of manufacturing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial applications]

The present invention relates to a case-type solid electrolytic capacitor suitable for surface mounting used in small electronic equipment, and more particularly to a solid electrolytic capacitor that contributes to cost reduction in manufacturing.

[0002]

2. Description of the Related Art High-density packaging technology for realizing further miniaturization and portability of electronic equipment is indispensable, and there is a strong demand for miniaturization of electronic components. With the demand for miniaturization, solid electrolytic capacitors having relatively large-capacity characteristics have also been shifted from conventional circular lead terminals to leadless solid electrolytic capacitors. Conventionally, as a leadless type solid electrolytic capacitor, one in which a capacitor element is covered with an exterior resin by molding is generally used. However, in the molding of exterior resin, usually a large number of pieces are molded at once in order to improve mass productivity, so the amount of resin to be filled in the gates and runners of the mold becomes extremely large, and the utilization rate of resin decreases. In particular, for small chip type solid electrolytic capacitors, the resin utilization rate is 1%.
It may be 0% or less. Therefore, recently, a so-called case-type solid electrolytic capacitor in which the exterior of a chip-type solid electrolytic capacitor is covered with a metal or resin case has begun to be used.

This case type solid electrolytic capacitor is shown in FIG.
As shown in the figure, a plurality of capacitor elements 2 to which the external lead leads 1a and 1b are connected are respectively inserted into a multiple resin case 3 having an opening, and under reduced pressure, bubbles are prevented and resin 4 is poured and cured. After sealing, it is cut at a position shown by a dotted line in the figure, separated individually, and connected to an external terminal (not shown). Japanese Patent Application Laid-Open No. 5-121280 discloses a technique for improving the utilization ratio of the exterior resin by eliminating the unnecessary resin by arranging the exterior in this manner.

[0004]

In the solid electrolytic capacitor having the above-mentioned structure, the inside of the case must be filled with the resin under reduced pressure, and the multiple resin cases 3 are separately separated during the assembling process. Complicated work, such as mounting of external terminals, was required. Therefore, there has been a problem that the assembly cost is increased, the cost is increased, and a tall vertical capacitor is required. SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and to provide a low-cost and thin solid electrolytic capacitor and a method for manufacturing the same, in which individual separation is all performed after completion of assembly, and individual terminals are not required to be separately mounted. It is.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a capacitor element in which an anode lead is led out from one end face of a metal sintered body and a cathode of the metal sintered body is formed on the outer peripheral surface. It has a first support for supporting the anode lead and a second support for supporting the cathode, and is electrically connected to the anode lead and the cathode by a conductive member on the back side of each support. An insulating substrate having a first external electrode and a second external electrode, and a solid electrolytic capacitor comprising: a covering material that covers a main part including the capacitor element supported by the insulating substrate. provide. Also,
Forming recesses at predetermined intervals on the insulating substrate, supplying a conductive adhesive on the electrodes electrically connected on both sides of the thick portion and the thin portion by the recesses, Inserting a capacitor element having a columnar metal sintered body having a cathode formed on the outer peripheral surface thereof into a lead to connect the anode lead and the cathode to the front-side electrode, respectively, and exposing the capacitor element A method for manufacturing a solid electrolytic capacitor, comprising: a step of covering a portion with a covering material; and a step of cutting a region adjacent to a capacitor element on an insulating substrate.

[0006]

According to the above construction, a capacitor element having an anode lead extending from one end of a metal sintered body is mounted horizontally on an insulating substrate, and a short solid electrolytic device suitable for higher density surface mounting. Capacitors can be provided. In addition, a plurality of horizontal capacitor elements are mounted on an insulating substrate, a conductive adhesive is supplied to the electrodes of the capacitor elements, the exposed portions of the capacitor elements are covered with a coating material such as resin, and the adhesive is fixed at once. By cutting and separating into individual capacitor units, a method for manufacturing a solid electrolytic capacitor suitable for mass production can be provided.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. The solid electrolytic capacitor of the present invention, as shown in FIG.
An anode lead 6 is led out from one end surface of the columnar metal sintered body 5, and a capacitor element 7 having a cathode 5 a formed on the outer peripheral surface of the metal sintered body 5 is provided. The insulating substrate 8 includes a first supporting portion 8a for supporting the anode lead 6 of the capacitor element 7 and a second supporting portion 8b for supporting the cathode 5a. On the back surface, first and second external electrodes 9, 10 are formed. And conductive members 11, 1 penetrating the insulating substrate 8 and electrically connected to the external electrodes 9, 10.
2 has reached the top of the first support 8a and the second support 8b. The first support 8a and the second support 8b of the insulating substrate 8 are provided with a step. The conductive adhesive 13 is supplied to the top of the first support 8a of the insulating substrate 8, and the conductive adhesive 14 is also supplied to the top of the second support 8b. The anode lead 6 and the cathode 5a of the capacitor element 7 are electrically led out to the first external electrode 9 and the second external electrode 10, respectively, by being mounted and heated and cured and fixed in an oven.
The exposed portion of the capacitor element 7 is covered with a case 15 such as a resin.

FIG. 2 shows a manufacturing method suitable for mass production. As shown in the figure, a plurality of recesses having a shape capable of being half-buried by placing a capacitor element 7 having a columnar metal sintered body 5 horizontally on a plurality of insulating substrates 8A formed by a molding die are provided at predetermined intervals. The electrode connection portions, which are the upper ends of the conductive members 11 and 12, are provided at locations where the anode lead 6 and the cathode 5a of the capacitor element 7 are in contact with each other. Through the insulating substrate 8A to be electrically connected. A conductive adhesive is supplied to each electrode connection, and the capacitor element 7 is inserted into the recess as shown in FIG. 3A. Next, an adhesive is applied on the insulating substrate 8A, and a multi-piece cover 15A shown in FIG. 3B covering the exposed portion where half of the capacitor element 7 is exposed is covered from above, and is collectively put together with the conductive adhesive. And heat-cured and fixed in an oven. Then, laser cutting is performed in an area adjacent to the capacitor element to obtain an individual solid electrolytic capacitor.

As another manufacturing method, as shown in FIG. 4, a multi-cavity insulating substrate 8B laminated and formed has a shape in which a convex step is provided on the first support portion side which is easy to manufacture. In particular, it is suitable for mounting a prismatic capacitor element. Then, as long as the exposed portion is covered, a single case 15B as shown in FIG. 4 is covered from above. Separation is also achieved by providing a cut 8C in advance on the substrate 8B and bending it to obtain an individual solid electrolytic capacitor.

[0010]

According to the present invention, a capacitor in which a capacitor element is mounted horizontally on an insulating substrate and a main part including the capacitor element is covered with a case is suitable for high-density surface mounting, and particularly a solid electrolytic capacitor having a short height. Can be provided. Furthermore, by mounting multiple capacitor elements on an insulating substrate, the electrodes of the capacitor elements and the cover material are collectively adhered and fixed, and then cut and separated into individual capacitors, so that they can be inserted into the case like conventional capacitors. This eliminates the need for complicated work such as performing resin filling under reduced pressure and attaching external terminals after separating multiple resin cases individually during the assembly process, which is suitable for mass production and greatly reduces assembly work. Thus, it is possible to provide an inexpensive solid electrolytic capacitor with reduced manufacturing cost and a method for manufacturing the same.

[Brief description of the drawings]

FIG. 1 is a sectional view of a capacitor assembly according to an embodiment of the present invention.

FIG. 2 is a perspective view of a multi-piece insulating substrate according to another embodiment of the present invention.

3A and 3B are perspective views showing a manufacturing process in another embodiment of the present invention.

4A and 4B are perspective views showing a manufacturing process in another embodiment according to the present invention.

FIG. 5 is a sectional view of a conventional capacitor assembly.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 5 Metal sintered body 5a Cathode 6 Anode lead 7 Capacitor element 8 Insulating substrate 8a First supporting part 8b Second supporting part 8A, 8B Plural insulating substrates 9 First external electrode 10 Second external electrode 11 , 12 Conductive member 13, 14 Conductive adhesive 15 Case 15A Multiple case 15B Single case

Claims (2)

(57) [Claims] 1. A capacitor element having an anode lead extending from one end surface of a metal sintered body and having a cathode formed on the outer peripheral surface of the metal sintered body, and a conductive adhesive in contact with the anode lead.
And a first supporting portion for supporting the anode lead through an agent.
A second supporting portion for supporting the cathode through an electrically conductive adhesive;
And the anode lead on the back side of the first support portion.
Of the first external electrode electrically connected to the
And the cathode and the conductive member on the back side of the second support portion.
A second external electrode that is more electrically connected, and
Forming a step between the first support and the second support
A solid electrolytic capacitor, comprising: an insulating substrate formed as described above; and a covering material that covers a main part including the capacitor element. 2. The method according to claim 1, wherein the insulating substrate includes a plurality of first support portions having a concave shape.
Forming a plurality of second support portions in a shape,
The insulating substrate is provided on a portion of the support portion and the second support portion.
After forming a hole so that it penetrates, the process of loading the conductive member
And the first support so as to be electrically connected to the conductive member.
Supplying a conductive adhesive to the part and a part of the second support part
And electrically connecting with the conductive member.
The first external electrode and the second external electrode
Forming an external electrode, wherein is inserted into the second support portion and the first support portion and the capacitor element having the derived metal sintered body to form a cathode on the outer circumferential surface from the anode lead end anode lead and step of connecting each said cathode to said conductive member, a step of covering the exposed portions of the capacitor element in the dressing, that a step of cutting the region adjacent the capacitor element on the insulating substrate A method for manufacturing a solid electrolytic capacitor.