JPH0520318U - Solid electrolytic capacitor - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a solid electrolytic capacitor having a three-terminal structure with high reliability of automatic insertion and mounting on a printed circuit board. [Structure] A component in which a pair of an anode lead (2) and a cathode lead (3) is attached to a capacitor element (1), one anode external lead-out terminal (4) in the center and two cathodes on both sides thereof. The external drawing terminals (5) and (6) are connected to a socket (8) having a predetermined pitch in a row, and a main part including the capacitor element (1) is insulated and protected by an exterior member (9). Two terminals (5) on both sides of the socket (8)
(6) is connected by a connecting terminal (7). The anode lead (2) of the capacitor element (1) is connected to the central terminal of the socket (8), and the cathode lead (3) is connected to either one of the terminals (5) and (6) on both sides.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a solid electrolytic capacitor having a three-terminal structure.

[0002]

[Prior Art]

 A solid electrolytic capacitor is a resin-coated type in which the main part is resin-coated, and generally has a two-terminal structure in which two leads, an anode and a cathode, are led out from a resin package. To mount a solid electrolytic capacitor with a two-terminal structure on a printed circuit board, insert the corresponding anode and cathode leads into the mounting holes drilled in two places at the capacitor mounting position on the printed circuit board, and mount it on the conductive land of the printed circuit board. It is done by soldering. However, in the case of this type of solid electrolytic capacitor, there is a risk of erroneous mounting, in which the polarities of the two leads are wrongly inserted into the two mounting holes of the printed circuit board and soldered as it is.

Therefore, a solid electrolytic capacitor C having a three-terminal structure as shown in FIGS. 4 and 5 has been put into practical use as a solid electrolytic capacitor for avoiding the risk of erroneous mounting. This is done by welding an external anode lead (11) to the anode lead (2) that is set up in the capacitor element (1), and two external cathode leads ( This is a structure in which 12) and 13) are connected by solder or the like, and the main part including the capacitor element (1) is covered with the exterior resin material (14). The capacitor element (1) is formed by press-molding and sintering a metal powder having a valve action, such as tantalum, around an anode lead (2) made of a metal having the same valve action. The capacitor element (1) is subjected to chemical conversion treatment or the like to form a cathode electrode extraction layer on the surface thereof, and the tip portions of the external cathode leads (12) (13) are connected thereto. Two external cathode leads (12) (13) are arranged in parallel on both sides of one external anode lead (11) with the same pitch P, and the tips of these three leads (11) to (13) are They are arranged on a straight line L of 5.

FIG. 6 illustrates an example of manufacturing the solid electrolytic capacitor C. A plurality of external anode leads (11) ... 11) The anode lead (2) of the capacitor element (1) is welded to the tip of the. Further, a plurality of sets of two sets of external cathode leads (12) (13) are fixed and positioned on one strip plate (15), and the tips of each set of external cathode leads (12) (13). Part of the capacitor element (1) is sandwiched and connected to the capacitor element (1). Then, the exterior resin material (14) is formed in the state of FIG. 6 by a dip method or the like, and then the leads (11) (12) (13) ...

FIG. 7 is a perspective view when the solid electrolytic capacitor C is mounted on the printed board (17). The printed circuit board (17) has three mounting holes (18) to (20) in a straight line on the capacitor mounting surface at a constant pitch P. The central mounting hole (18) is for the anode, and the mounting holes (19) (20) on both sides are for the cathode. Conductive lands (not shown) are formed around the mounting holes (18) to (20) on the back surface of the printed circuit board (17), and the conductive lands of the mounting holes (19) (20) on both sides are electrically connected. It is connected. On the printed circuit board (17), insert the solid electrolytic capacitor C into the three mounting holes (18) to (20) corresponding to the three leads (11) to (13), and place the solid electrolytic capacitor C on the back surface of the printed circuit board (17). It is mounted by soldering. At the time of this mounting, even if the mounting angle of the solid electrolytic capacitor C is 180 ° reversed, the central external anode lead (11) is inserted into the central anode mounting hole (18), and the external cathode leads on both sides are inserted. Since (12) and (13) are inserted into the cathode mounting holes (19) and (20) on both sides, there is no risk of erroneous mounting due to incorrect polarity insertion. Such implementation is done automatically using an automatic insertion machine.

[0006]

[Problems to be solved by the device]

 The conditions for preventing the solid electrolytic capacitor C having the above-mentioned three-terminal structure from being erroneously mounted on the printed circuit board (17) are that the tips of the three leads (11) to (13) are three mounting holes of the printed circuit board (17). That is, they are arranged on a straight line at the same pitch P as in (18) to (20). However, as explained with reference to FIG. 6, each lead (11) to (13) is a long lead cut in the middle, and the pitch of each tip has a slight deviation. Occurs. In addition, the leads (11) to (13) derived from the exterior resin material (14) have weak mechanical strength, so that external force is not applied until the leads (11) to (13) are inserted into the printed board (17) by an automatic insertion machine. There is a high possibility that it will be deformed when received, and that the pitch of the tips will be uneven due to this deformation. As a result, the solid electrolytic capacitor C is not mounted on the printed circuit board (17) with the wrong polarity, but there is some deviation in the pitch of any of the three leads (11) to (13). If it occurs, it cannot be automatically inserted into the corresponding mounting holes (18) to (20), and it becomes impossible to mount it, which deteriorates the operating rate of the manufacturing equipment using the automatic insertion machine.

Therefore, an object of the present invention is to provide a solid-state charge capacitor having a stable three-terminal structure in which the terminal arrangement is always constant and can be accurately and surely inserted into a printed circuit board or the like. is there.

[0008]

[Means for Solving the Problems]

 The present invention comprises a capacitor element having a pair of an anode lead and a cathode lead attached thereto, one terminal for externally extracting electrodes of one polarity and two electrically connected terminals for externally extracting electrodes of opposite polarity. The above object is achieved by assembling and integrating a socket having a total of three terminals integrally in a predetermined arrangement as follows.

That is, the anode lead and the cathode lead of the corresponding capacitor element are connected to each one of the two polarities of the three terminals of the socket by pressure welding or soldering, and the capacitor element and the socket are integrated. The main part including the capacitor element is insulated and protected by the exterior member.

[0010]

[Action]

 The three-terminal socket is manufactured in a process different from the capacitor element manufacturing process, and various shapes and strengths such as female pin terminals can be applied to the three terminals, and the socket is arranged in a fixed arrangement for the socket. Easy to install. For example, one of the three terminals of this socket is for the anode and the other two are for the cathode, and the two cathode terminals are arranged at symmetrical positions on both sides of the anode terminal. Terminal is electrically connected, the anode lead of the capacitor element is connected to one anode terminal in the center, and the cathode lead of the capacitor element is connected to one of the two cathode terminals on both sides. As a result, a solid electrolytic capacitor having a three-terminal structure is manufactured. This solid electrolytic capacitor is mounted on a printed circuit board, etc. with 3 terminals of the socket. In this mounting, the polarity arrangement of the 3 terminals of the socket is symmetrical, so there is a possibility that the polarity is wrong and it is mounted incorrectly. There is no. Further, the arrangement pitch of the three terminals of the socket is constant, there is almost no possibility of variation, and the socket is securely inserted into a printed circuit board or the like and mounted by soldering.

[0011]

【Example】

 An embodiment of the present invention is shown in FIG. 1, an assembly example thereof is shown in FIG. 2, and another embodiment is shown in FIG.

1A to 1D are a front view, a bottom view, a cross-sectional view, and an equivalent circuit diagram of a solid electrolytic capacitor having a three-terminal structure. This solid electrolytic capacitor has a capacitor element (1), a three-terminal socket (8), and an exterior member (9). An anode lead (2) is erected in the capacitor element (1), a cathode lead (3) is connected to one place on the surface, and both leads (2) and (3) extend in parallel in the same direction. The capacitor element (1) and the anode lead (2) may be the same as those in the conventional product of FIG. 4, and the same reference numerals are given and the description thereof is omitted. Hereinafter, the capacitor element (1) and the bipolar leads (2) and (3) will be collectively referred to as a lead unit (10).

The three-terminal socket (8) is made of an insulating material such as resin, and the three terminals (4), (5) and (6) are fixed to the three-terminal socket (8) by vertically penetrating it. The three terminals (4) to (6) are arranged in a predetermined arrangement, for example, on a straight line with a constant pitch P, one in the center is called a first terminal (4), and two terminals on both sides thereof are second, When referred to as the third terminals (5) and (6), the second and third terminals (5) and (6) are electrically connected to each other by the connecting terminal (7) in the socket (8). The mechanical strength of each of the terminals (4) to (6) is higher than the mechanical strength of the anode lead (2) or the cathode lead (3) embedded in the capacitor element (1). Further, each of the terminals (4) to (6) has female lead connecting portions (4a) to (6a) fixed inside the socket (8), and two of them have a lead unit (10). The respective leads (2) and (3) are inserted and electrically and mechanically connected. After attaching the lead unit (10) to the socket (8), an exterior member (9) for enclosing the lead unit (10) to insulate and protect is formed. The exterior member (9) is, for example, a resin material dipped in the lead unit (10).

Connection between the socket (8) and the lead unit (10) is performed as shown in FIG. The anode lead (2) and the cathode lead (3) of the lead unit (10) are made short in length, and the pitches of the tips of both are matched with the terminal pitch P of the socket (8). Then, the anode lead (2) of the lead unit (10) is connected to the lead connection portion (4a) of the first terminal (4) at the center of the socket (8), and the cathode lead (3) is connected to the socket (8). One of the second and third terminals (5) and (6) of the book, for example, is inserted into the lead connecting portion (6a) of the third terminal (6) and pressure-connected. After that, if the exterior member (9) is formed, the first terminal (4) at the center is an anode, and the second and third terminals (5) and (6) on both sides are common cathodes. An electrolytic capacitor is obtained.

When mounting such a solid electrolytic capacitor on the printed board (17) of FIG. 7, the three terminals (4) to (6) of the socket (8) are attached to the three corresponding mounting holes of the printed board (17). Insert into (18) to (20) and solder. Since the socket (8) may be laterally inverted by 180 °, this mounting can be performed without mistaken polarity as in the conventional case. Further, the three terminals (4) to (6) of the socket (8) are mechanically and stably fixed to the socket (8), and it is easy to always keep the arrangement pitch constant. Therefore, the insertion of the solid electrolytic capacitor into the printed board (17) is always performed accurately, and there is almost no possibility of mounting failure.

The above embodiment is a solid electrolytic capacitor having a three-terminal structure in which the central terminal of the three terminals is for the anode and the both side terminals are for the cathode. It is also possible to change it for the anode. FIG. 3 shows a solid electrolytic capacitor having a three-terminal structure modified in this way. In the solid electrolytic capacitor of FIG. 3, the anode lead (2) of the lead unit (10) is inserted into the second terminal (5) of the socket (8 ′), and the cathode lead (3) is inserted into the first terminal (4). The lead unit (10) is insulated and protected by the exterior material (9 '). The exterior member (9 ') shown in FIG. 3 is formed by resin molding, but may be formed by resin dip. When the resin dip is used, the shape of the exterior member (9 ') is asymmetrical, so that the central terminal (4) in FIG. 1 is for the anode, and both side terminals (5) and (6) are The appearance can be distinguished from the case for the cathode, and incorrect connection to the printed circuit board is eliminated.

The present invention is not limited to the above embodiment, and for example, a three-terminal structure in which three terminals are arranged in an isosceles triangle arrangement, one in the center has one polarity, and the other two have different polarities. Even a solid electrolytic capacitor can be effectively applied.

[0018]

[Effect of the device]

 According to the present invention, a socket having a three-terminal structure can be manufactured with an accurate terminal arrangement pitch, and there is almost no possibility of the terminal arrangement pitch fluctuating after the manufacture. Therefore, the socket is mounted on a printed circuit board through this socket. By doing so, it is possible to provide a solid electrolytic capacitor having a three-terminal structure in which terminals cannot be inserted into a printed circuit board or the like, which can always be surely mounted, and which is free from the possibility of wrong polarity. In particular, improving the reliability of terminal insertion on the printed circuit board has the effect of significantly improving the operating rate of automatic capacitor mounting equipment that uses an automatic insertion machine.

[Brief description of drawings]

1 shows a solid electrolytic capacitor according to an embodiment of the present invention, (a) is a front view including a partial cross section, (b) is a bottom view,
(C) is an enlarged sectional view taken along the line AA, and (D) is an equivalent circuit diagram.

FIG. 2 is a front view of the capacitor of FIG. 1 when assembled.

FIG. 3 is a front view including a partial cross section showing another embodiment of the present invention.

FIG. 4 is a sectional view of a conventional 3-terminal solid electrolytic capacitor.

5 is a bottom view of the capacitor of FIG.

FIG. 6 is a front view showing a manufacturing process of the capacitor of FIG.

FIG. 7 is a perspective view of the capacitor of FIG. 4 when mounted on a printed circuit board.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Capacitor element 2 Anode lead 3 Cathode lead 4 terminal 5 terminal 6 terminal 8 socket 8'socket 9 exterior member 9 'exterior member

Claims (4)

[Scope of utility model registration request] 1. A capacitor element formed of a metal member having a valve action, an anode lead set up in the capacitor element, and a cathode lead connected to the surface of the capacitor element and extending in the same direction as the anode lead. , Which has a total of three terminals, one unipolar electrode external lead-out terminal and two electrically connected different polarity electrode external lead-out terminals, in a predetermined arrangement, out of the three terminals One of each of the two polarities is provided with a socket having a three-terminal structure connected to the anode lead and the cathode lead of the corresponding capacitor element, and an exterior member for insulating and protecting the main part including the capacitor element. Solid electrolytic capacitor. 2. The mechanical strength of the three terminals for externally drawing out electrodes of the socket having the three-terminal structure is higher than the mechanical strength of the anode lead embedded in the capacitor element or the cathode lead connected to the capacitor element. The solid electrolytic capacitor according to claim 1, which is large. 3. The three terminals for external extraction of electrodes of the socket having the three-terminal structure are arranged in a straight line, the central terminal is an external extraction terminal for an anode, and both terminals are external extraction terminals for a cathode. Claim 1 or claim 2 characterized in that
The solid electrolytic capacitor described. 4. The three electrode external lead-out terminals of the three-terminal structure socket are arranged in a straight line, the central terminal is a cathode external lead-out terminal, and both terminals are anodes for external lead-out terminals. Claim 1 or claim 2 characterized in that
The solid electrolytic capacitor described.