JPS6148770B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a solid electrolytic capacitor, and in particular to a method for manufacturing a solid electrolytic capacitor, in particular a production process in which capacitor elements manufactured in groups of multiple capacitor elements are sequentially joined to each lead frame connected and formed in a hoop shape. The present invention relates to a manufacturing method that improves the quality and quality of the product.

Conventionally, as a means of mass production of solid electrolytic capacitors, a large number of lead frames are connected and formed, and a plurality of capacitor elements each having one end of the lead wire fixed to the other end of the lead wire are fixed to a metal substrate in groups. A method has been implemented in which the intermediate portions of the lead wires of each of the capacitor elements are separated from the metal substrate by processing and sequentially bonded to the lead frame. Figure 1 is a plan view sequentially showing the conventional main steps of connecting capacitor elements to a hoop-shaped connecting lead frame, and Figure 2 is a plan view showing a plurality of capacitor elements (for example, 34) bonded to a metal substrate. FIG.

In FIG. 1a, a large number of lead frames 2 are formed by press-working a hoop material and connected to a connecting member 1 thereof. The lead frames 2 are made up of an anode lead terminal 3 and a cathode lead terminal 4. On the other hand, as shown in FIG. 2, the capacitor element 5 has an anode body 6 made of aluminum or the like.
One end of the lead wire 7 cut to a predetermined length is fixed to the substrate, the other end of the lead wire 7 is fixed to a metal (for example, a stainless steel layer substrate 8), and an oxide film or electrolyte is applied to each anode body 6 in which a plurality of anode bodies are arranged in parallel. The layers and the cathode body 9 are sequentially deposited in groups.Then, each capacitor element 5 is separated from the metal substrate 8 by cutting the middle part of the lead wire 7, and then placed in a clamper (not shown). The fixed capacitor element 5 is clamped and transported and fixed onto the lead frame.In FIG. As shown in FIG. 1, the excess length of the lead wire 7 is cut off, and the cathode lead terminal 4 and the cathode layer 9 are connected with solder 10. Next, the outer sheath 11 covering the capacitor element 5 and each of the connection parts is shown in FIG. 1d. After applying as shown, each connecting portion between the lead terminals 3 and 4 and the connecting member 1 is cut to form a desired solid electrolytic capacitor 12.
is obtained.

That is, conventionally, capacitor elements separated from a metal substrate were transported and fixed one by one onto a predetermined lead frame, and the lead wires and anode lead terminals were welded. In addition to mutually constraining their shapes and operations, it was also necessary to consider allowing for variations in welding locations caused by variations in clamper operation. In addition, this was one of the factors that made it impossible to improve the efficiency of the welding work.

The purpose of the present invention is to eliminate the above-mentioned problems, and this purpose is to fit a comb-shaped jig to the lead wires of each capacitor element attached to a metal substrate at the same pitch as the connection forming pitch of the lead frame. A first step is to straighten the bends in the pitch direction of the lead wires in groups, and to superimpose the capacitor element on the connected lead frame to compensate for any imperfections in the lead wires and to prevent them from moving during the welding process. a second step of welding a portion of the lead wire to a predetermined portion of the opposing lead frame while individually restraining the lead wire; and a second step of cutting off an intermediate portion of the lead wire that directly connects the welded portion and the metal substrate. This is accomplished by providing a method for manufacturing a solid electrolytic capacitor characterized by sequentially including the steps of step 3.

Hereinafter, the present invention will be explained using drawings related to embodiments of the present invention.

FIG. 3 is a perspective view for explaining the first step and the main parts of the device according to an embodiment of the method of the present invention, and FIG. 4 is a product plane for explaining the second and third steps according to the above-mentioned embodiment. FIG. 5 is a perspective view showing the main structure of an apparatus for carrying out the second and third steps.
However, the same reference numerals are used for the same parts as in the previous figure.

In FIG. 3, 15 is a comb-like cleaning plate that can move up and down and back and forth by a predetermined amount, 16 is a support plate that can be moved up and down by a predetermined amount, and 17 is a jig that holds the metal substrate 8. The main plate 15 and the support plate 16 are vertically opposed to each other with the holder 17 in between. In addition,
The main plate 15 is provided with a plurality of V-shaped grooves 18 opening on the lower surface, and the pitch of each groove 18 is made to match the regular pitch size of the lead wire 7 fixed to the metal substrate 8.

Then, when the board 8 to which the capacitor element 5 is fixed to one end and the other end of each lead wire 7 is fixed to the holder 17, the upper part of the intermediate part of each lead wire 7 (the part led out from the board 8) The grooves 18 of the front plate 15 face each other, and the upper surface of the support plate 16 faces below the other end of each lead wire. Therefore, when the device is driven, the support plate 16 rises so that its upper surface comes into contact with the other end of each lead wire, and the main plate 15 descends to touch the bottom of each groove 18. The lead-out portions of the respective lead wires 7 are sandwiched between them. Next, the main plate 15 moves in the front-back direction so that each groove 18 squeezes each lead wire 7, and then rises, and the support plate 16 descends and returns to its original position (the position shown in the figure).
As a result, each lead wire 7, which is often bent in the manufacturing process of capacitor element 5, etc., is straightened in the direction of the parallel pitch and becomes approximately regular in size, thus completing the first process.

In FIG. 4, the metal substrate 8 that has completed the first step is transported to a welding device that fixes a plurality of lead frames 2 connected in a hoop shape in a predetermined position.
Each capacitor element 5 is arranged to face a predetermined portion of a predetermined lead frame 2 . Then, after completing the second step by sequentially spot welding the overlapping portions of each lead wire 7 and the anode lead terminal 3 of each lead frame 2, the metal substrate 8 is slightly welded from the welded portion.
The third step is completed by cutting the middle portion of the lead wire 7 close to. However, during welding in the second step, each lead wire 7 to be welded has a portion attached to a predetermined portion of the lead frame and a pair of welding electrodes (see FIG. 5).
5, 28). Before being pressed between By using 26) in Fig. 5, it becomes restrained in the left and right direction. Therefore, the lead frame 2, the capacitor element 5 and its lead wire 7
, and a plurality of capacitor elements 5 (lead wires 7) and a plurality of lead frames 2.
(anode lead terminal 3) at the same time, it becomes easy to weld both of them continuously.

In FIG. 5, the spot welding device 19, which welds two places at a time, has a connecting lead frame metering movement mechanism consisting of a pair of sprockets 20, etc., and a positioning mechanism for the metal substrate 8, consisting of an air cylinder 21, etc. , two pairs of spot welding electrodes, a lead wire cutting cutter, and the like are each mounted on a carriage 22 and the like. However, the arrows drawn in various places in the figure indicate the direction of movement of each part that is intermittently driven according to a preset program. The lead frame metering movement mechanism welds the lead wire 7 of each capacitor element 5 fixed to the metal substrate 8 to the anode lead terminal 3 of each lead frame 2, and then rotates the sprocket 20 by a predetermined angle. The two groups of lead frames that have been welded are moved out of the area facing the welding electrode, and the new two groups of lead frames facing the newly supplied metal substrate 8 are made to stand by at a fixed position.

On the other hand, the positioning mechanism presses the newly supplied metal substrate 8 whose left and right side protrusions fit into the grooves of the positioning jig 23 to the left by driving the air cylinder 21. The jig 23 is fixed in such a way that the stepped portion on the left abuts against the side surface of the protrusion 24 of the jig 23. As a result, the metal substrate 8 is connected via the lead wire 7.
Each of the plurality of capacitor elements 5 fixed to the lead frame 2 is positioned on a predetermined portion of each of the plurality of lead frames 2 .

On the other hand, each carriage (carrier) 22 is movable up and down, and has an upper electrode 25 for spot welding, a lead wire guide plate 26, an upper cutter 27, a lower electrode 28 for spot welding, and a lower cutter, each having two pieces. 29 is attached, and the upper electrode 25 and the lower electrode 28
The upper cutter 26 and the lower cutter 29 are opposed above and below the lead frame 2, respectively.
However, the upper electrode 25 and the front plate 26 are arranged in parallel in the front-rear direction, and the upper electrode 25 and the upper cutter 27
The lower electrode 28 and the lower cutter 29 are arranged side by side, separated by one pitch of the lead frame 2 in the left-right direction. Therefore, when the welding drive of the device 19 is started, each of the upper electrodes 25, the front plate 26, and the upper cutter 27 descend simultaneously, while each of the lower electrodes 2
8 and the lower cutter 29 rise, and before welding pressure is applied, a portion of the lead wire 7 is fitted into the groove 30 of the main plate 26 and held in the correct position so as not to move in the left-right direction. A predetermined portion of the lead terminal 3 of the lead frame 2 facing the lead wire 7 is pressed and welded to a predetermined pressure between the end surfaces of the upper electrode 25 and the lower electrode 28. At the same time, the cutting blades of the upper cutter 27 and the lower cutter 29 cut the middle portion of the previously welded lead wire 7. Next, the electrodes 25 and 28, the cutters 27 and 29, and the front plate 26 are reversely driven to return to their original positions (the positions shown), and the carriage 22 moves to the right by one pitch of the lead frame 2. do. Thereafter, the above welding drive is repeated, and when all the capacitor elements 5 fixed to one metal substrate 8 are connected to each lead frame 2, the carriage 22 moves to the left and returns to the initial position. Returning, the substrate 8 is removed and a new metal substrate 8 is supplied.

In addition, in FIG. 5, 31 is a welding head, and 32 is a welding head.
Air cylinders 32 and 33 for vertically moving the welding head 31, upper cutter 27, etc. are air cylinders for vertically moving the lower electrode 28 and lower cutter 29 via a cam bar 34, rollers 35, etc. Also,
Although the welding device 19 is constructed with two welding heads, it may be equipped with one or three or more welding heads.

As explained above, according to the method of the present invention, the lead wire pitch of each capacitor element is adjusted while the capacitor elements manufactured in groups of a plurality of capacitor elements are connected to the group-constituting metal substrate, and the welding device After welding the lead wires to each lead frame while correcting the position of each lead wire,
Since the lead wire and the metal substrate are separated, the relative relationship between the capacitor element and the lead frame (negative and positive lead terminals) is accurate. Therefore, post-processes such as soldering the cathode of the capacitor element and the cathode lead terminal of the lead frame are made reliable and easy, and the conventional clamper for transporting and fixing the capacitor elements individually is no longer required, and the welding electrode The practical effect of simplifying the structure and realizing multiple welding heads (simultaneous welding of multiple capacitor elements) is remarkable.

[Brief explanation of the drawing]

Fig. 1 is a plan view sequentially showing the conventional main steps of connecting capacitor elements to a hoop-shaped connected lead frame, Fig. 2 is a plan view of a plurality of capacitor elements connected to a metal substrate, and Fig. 3 FIG. 4 is a product plan view for explaining the second and third steps according to the embodiment; FIG. FIG. 5 is a perspective view showing the main structure of a welding device that performs the second and third steps. In the figure, 2 is a lead frame, 3 is an anode lead terminal, 4 is a cathode lead terminal, 5 is a capacitor element, 7 is a lead wire, 9 is an element cathode, 12
1 is a solid electrolytic capacitor, 15 is a comb-like front plate, 25 is an upper electrode, 26 is a front plate, 27 is an upper cutter, 28 is a lower electrode, and 29 is a lower cutter.

Claims (1)

[Scope of Claims] 1. Lead wires attached to each of a plurality of solid electrolytic capacitor elements are fixed to a metal substrate at a predetermined pitch, and after forming a dielectric layer on the capacitor elements in groups, When welding the lead wires to respective predetermined locations of the lead frame in which the lead frames are connected, comb teeth are attached to the lead wires of the capacitor elements attached to the metal substrate at the same pitches as the connection formation pitches of the lead frame. a first step of correcting the bending in the pitch direction in groups by inserting a shaped jig, and superimposing the capacitor element on a predetermined position of the connecting lead frame and restraining the lead wires individually. A second step of welding a portion of the lead wire to a predetermined portion of the opposing lead frame; and a third step of cutting off an intermediate portion of the lead wire between the welding location and the metal substrate. A method for manufacturing a solid electrolytic capacitor characterized by: