JPH0936006A - Device for feeding capacitor element for manufacturing solid electrolytic capacitor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the dielectric breakdown of a capacitor element, in feeding the capacitor element for a solid electrolytic capacitor so that the anode rod of the capacitor element touches the anode lead terminal of a lead frame. SOLUTION: A collet body 14, that clamps the capacitor element, is mounted vertically movably on a movable head 13 that moves upward and downward to be free and moved downward so as to touch a stopper 16 that limits the downward movement of the movable head 13, and further the downward stroke of the movable head 13 toward the lead frame is so determined that at the limit of the downward movement the movable head is separated from the stopper by a length of H.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for supplying a capacitor element to a lead frame when a solid electrolytic capacitor such as a tantalum solid electrolytic capacitor is manufactured using the lead frame. Is.

[0002]

2. Description of the Related Art Generally, a solid electrolytic capacitor of this type is described in, for example, Japanese Unexamined Patent Publication No. 6-20891, and as shown in FIGS. 1 and 2, an anode lead terminal 1 made of a metal plate. , And a cathode lead terminal 2 also made of a metal plate are arranged to face each other on substantially the same plane, and a capacitor element 3 is provided between the lead terminals 1 and 2 of the chip piece 4 of the capacitor element 3. An anode rod 5 projecting from one end face is arranged so as to be fixed to the tip of the anode lead terminal 1 by spot welding, while between the tip of the cathode lead 2 and the cathode film 6 on the surface of the chip piece 4. Is connected via a safety fuse wire 7 against temperature or overcurrent, or the tip of the cathode lead 2 is directly connected to the cathode film 6 on the surface of the chip piece 4, and all of these are Synthetic resin Has been to the structure say that package in the mold portion 8.

Further, as a prior art, Japanese Patent Laid-Open No. 6-244
Japanese Laid-Open Patent Publication No. 233 proposes the following manufacturing method when manufacturing the solid electrolytic capacitor having the above structure. That is, a lead frame is used which has a pair of left and right side frames inwardly formed with an anode lead terminal and a cathode lead terminal formed at appropriate intervals in the longitudinal direction, and the lead frame is transferred in the longitudinal direction. First, in the first stage, a capacitor element is supplied between each anode lead terminal and the cathode lead terminal so that the anode rod in the capacitor element contacts the upper surface of the anode lead terminal, and the capacitor element is supplied. Fix the anode rod of the element to the anode lead terminal by spot welding,
Next, in the second stage, the chip piece of the capacitor element and the cathode lead terminal are connected as a safety fuse wire, and in the third stage, a synthetic resin mold part for packaging the capacitor element portion. After molding, the solid electrolytic capacitor is separated from the lead frame.

In this manufacturing method, the capacitor element is attached to the lead frame by a clamp type collet body or a vacuum suction type collet that reciprocates the capacitor element in the supply section between the supply section and the lead frame. After taking a picture with the body, supply between the lead terminals of the lead frame so that the anode rod of the capacitor element is in contact with the upper surface of the anode lead terminal, and then spot weld the anode rod to the anode lead terminal. , The image pickup of the capacitor element by the collet body is canceled.

[0005]

As described above, in the conventional manufacturing method, the capacitor element is pinched by the collet body and the anode rod of the capacitor element contacts the anode lead terminal with respect to the lead frame. It is supplied so as to correspond, and further, in a state where it is pinched by the collet body, the anode rod in the capacitor element is spot-welded to the anode lead terminal. There was a problem that the incidence was high.

That is, when the capacitor element is picked up by the collet body and supplied to the lead frame, the anode rod in the capacitor element is fragile even though the chip piece is considerably fragile. Impact and vibration will be applied when contacting the anode lead terminal. In addition to this, spot welding of the anode rod of the capacitor element to the anode lead terminal is performed by sandwiching it between a pair of current-carrying electrodes, and during this spot welding, the anode rod is crushed and deformed in the diameter direction. Therefore, an external force is applied to the capacitor element photographed by the collet body in the downward direction due to the crushing deformation of the anode rod in the diametrical direction.

In short, according to the conventional technique, when the capacitor element is supplied to the lead frame, in addition to shock and vibration, when the anode rod is spot-welded to the anode lead terminal. In the above, since an external force in the downward direction is applied, dielectric breakdown is likely to occur frequently in the dielectric film of the capacitor element, and thus the defective product rate is high.

SUMMARY OF THE INVENTION It is a technical object of the present invention to provide a supply device capable of surely reducing the occurrence rate of defective products during supply and spot welding of a capacitor element to a lead frame.

[0009]

In order to achieve this technical object, the present invention provides "a supply portion of a capacitor element for a solid electrolytic capacitor, and an anode lead terminal and a cathode lead terminal facing each other along a longitudinal direction as appropriate. A collet body is attached to a movable head that is configured to reciprocate between a lead frame formed at a pitch interval and move downward toward the lead frame. In the device for supplying a capacitor element, the collet body is vertically movably attached to the movable head, and is biased downward so as to come into contact with a stopper that defines a lower limit of lowering with respect to the movable head. , The lowering stroke of the movable head toward the lead frame is Was appropriately set to only leave size dimensions. Says "configuration from the stopper at the lower limit.

[0010]

[Operation] With this configuration, when the capacitor element taken by the collet body is supplied to the lead frame by the downward movement toward the lead frame in the movable head to which the collet body is attached,
When the anode rod in this capacitor element contacts the upper surface of the anode lead terminal in the lead frame, the collet body stops moving downward, and when only the rotating head moves further down by an appropriate size, the descending motion stops. It will be.

That is, when the anode rod of the capacitor element comes into contact with the upper surface of the anode lead terminal, the descending movement of the collet body photographing this capacitor element stops, and thereafter only the movable head descends. Therefore, the impact and vibration exerted on the capacitor element when the anode rod of the capacitor element is brought into contact with the anode lead terminal can be reduced more reliably than when the collet body is fixedly attached to the movable head. Of.

Further, in the state where the anode rod of the capacitor element is in contact with the upper surface of the anode lead terminal, the collet body which is photographing the capacitor element is separated from the stopper for regulating the lower limit of lowering of the collet body by an appropriate size. When the anode rod is spot-welded to the anode lead terminal when the anode rod is crushed and deformed in the diametrical direction, the capacitor element can be further lowered by the appropriate size. Since it descends following the crushing deformation in the diametrical direction, it is possible to reliably reduce unreasonable external force acting on the capacitor element during the spot welding.

[0013]

Therefore, according to the present invention, when the solid electrolytic capacitor is manufactured, when the capacitor element is supplied to the lead frame and then spot welding is performed,
It is possible to reliably reduce the occurrence of insulation failure in the capacitor element, and to significantly reduce the rate of defective products.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. 3 to 6 show the first embodiment, in which the reference symbol A indicates a lead plate made of a metal plate used in the production of a solid electrolytic capacitor, and a pair of left and right side frames A1 in this lead frame A1. On A2, an anode lead terminal 1 and a cathode lead terminal 2 facing each other are integrally formed in the longitudinal direction at an appropriate pitch.

During the transfer of the lead frame A along the upper surface of the transfer table 10 in the longitudinal direction thereof, the capacitor elements aligned and positioned on the upper surface of the supply table 11 at the side portion of the transfer table 10. Three
By the supply device 12, the anode rod 5 of the capacitor element 3 is brought into contact with the upper surface of the anode lead terminal 1 at a portion between the anode lead terminals 1 and the cathode lead terminals 2 of the lead frame A. Then, the anode rods 5 are spot-welded to the anode lead terminals 1.

The supply device 12 is configured to reciprocate laterally between the upper part of the lead frame A and the upper part of the supply table 11, and descend at both ends of the reciprocating motion and then ascend. A movable head 13 and a collet body 14 configured to vacuum-adsorb the capacitor element 3 are provided, and the collet body 14 is slidable in a vertical direction in a through hole 15 formed in the movable head 13. The stopper 16 that contacts the upper surface of the movable head 13 is fixed to the collet body 14, and the stopper 16 is urged downward so that the stopper 16 always contacts the upper surface of the movable head 13. By providing the spring 17 for this, the collet body 14 is attached to the movable head 13 so as to be movable up and down, and the stopper 1 that defines the lower limit of the lowering thereof is provided. A configuration that say that the downward urging by the spring 17 so as to brought into contact with.

The movable head 13 moves laterally above the supply table 11 and moves downward, so that the collet body 14 attached thereto picks up one capacitor element 3 on the supply table 11 by vacuum suction. In this case, the movable head 13 moves up, then laterally moves to the upper part of the lead frame A, and then moves down.
As shown in FIG. 3, the anode rod 5 of the capacitor element 3 is supplied between the anode lead terminal 1 and the cathode lead terminal 2 of the lead frame A so as to contact the upper surface of the anode lead terminal 1.

In this case, the movable head 13 takes a downward stroke toward the lead frame A by the collet body 14. The anode rod 5 of the capacitor element 3 is taken by the anode lead terminal 1. In such a manner that the stopper 16 is moved downward by an appropriate dimension H even after the contact with the movable head 13, that is, the stopper 16 is separated from the upper surface of the movable head 13 by an appropriate dimension H at the lower limit of the downward movement of the movable head 13. Set to.

As a result, when the anode rod 5 of the capacitor element 3 comes into contact with the upper surface of the anode lead terminal 1, the collet body 14 capturing the capacitor element 3 stops descending, and thereafter the movable head is moved. Since only 13 is further moved down by the appropriate dimension H, the collet body 14 receives the impact and vibration exerted on the capacitor element 3 when the anode rod 5 of the capacitor element 3 is brought into contact with the anode lead terminal 1. Can be reduced more reliably than in the case where is fixedly attached to the movable head 13.

Further, the anode rod 5 in the capacitor element 3
In the state in which is contacted with the upper surface of the anode lead terminal 1,
The stopper 16 for restricting the lower limit of the lowering of the collet body 14 is separated from the upper surface of the movable head 13 by an appropriate dimension H to capture the capacitor element 3.
Is in a state in which it can be further lowered by the appropriate dimension H, so that as shown in FIG. When the anode rod 5 is crushed and deformed in the diametrical direction when spot welding is performed by sandwiching by, the capacitor element 3 descends following the crushed deformation of the anode rod 5 in the diametrical direction. That is, it is possible to surely reduce the unreasonable external force acting on the capacitor element 3 during the spot welding.

FIG. 7 shows a second embodiment. In this second embodiment, a vacuum suction type collet body 14 is vertically movable with respect to the movable head 13 by a pair of two guide rods 20. A stopper 21 is provided at the lower end of each of the guide rods 20 to define the lower limit of lowering of the collet body 14, and the guide rods 20 are directed downward so that the collet body 14 is always in contact with the stopper 21. A spring 22 for urging the spring is provided.

Also in this case, the movable head 13
In the same manner as in the first embodiment, the stroke of the downward movement toward the lead frame A is set to a dimension that is appropriately separated from the stopper 21 at the lower limit of the downward movement of the movable head 13. It is possible to surely reduce the impact and vibration exerted on the capacitor element 3 when the anode rod 5 in 3 is brought into contact with the anode lead terminal 1, and to ensure that an unreasonable external force acts on the capacitor element 3 during spot welding. It can be reduced to

In each of the above embodiments, a vacuum suction type collet is used as the collet body.
It goes without saying that the present invention is not limited to this, and a clamp type collet body in which the capacitor element 3 is sandwiched from the left and right may be used.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view of a solid electrolytic capacitor.

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

FIG. 3 is a perspective view showing a first embodiment of the present invention.

FIG. 4 is a sectional view taken along line IV-IV of FIG. 3;

FIG. 5 is a diagram showing a state in which a capacitor element is supplied to a lead frame.

FIG. 6 is a diagram showing a state in which a capacitor element is spot-welded to a lead frame.

FIG. 7 is a diagram showing a second embodiment of the present invention.

[Explanation of symbols]

 1 Anode Lead Terminal 2 Cathode Lead Terminal 3 Capacitor Element 4 Chip Piece 5 Anode Rod 7 Safety Fuse Wire 8 Mold Part A Lead Frame 10 Transfer Table 11 Supply Table 12 Supply Device 13 Movable Head 14 Collet Body 15 Through Holes 16, 21 Stopper 17 , 22 springs

Claims (1)

[Claims] 1. A reciprocating motion between a supply portion of a capacitor element for a solid electrolytic capacitor and a lead frame in which opposing anode lead terminals and cathode lead terminals are formed at appropriate pitch intervals along the longitudinal direction, and the leads are provided. In a capacitor element supply device, wherein a collet body is attached to a movable head configured to move down toward a frame so that the capacitor element is photographed by clamping or vacuum suction, the collet body is moved to the movable head. Is mounted so as to be movable up and down with respect to the movable head, and is urged downward so as to contact with a stopper that defines the lower limit of lowering of the movable head. At the lower limit of the descending motion of the head, set a size that is appropriately separated from the stopper. Feeder capacitor element used in the production of a solid electrolytic capacitor, wherein was boss.