JP2013125910A - Capacitor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a capacitor which firmly connects an electrode part of a capacitor element with a terminal despite a simple structure.SOLUTION: A capacitor includes: a capacitor element 2 having electrode parts 3 at end surfaces; terminals 5 respectively connected with the electrode parts 3 of the capacitor element 2; and an exterior part 8 covering the capacitor element 2 and the terminals 5. Each terminal 5 has plating layers 5a and includes a connection part 6 extending outward from the exterior part 8 and an electrode connection part 7 connected with the electrode part 3 of the capacitor element 2 through solder 4. In the electrode connection part 7, a surface having the plating layer 5a forms a recessed part 7b facing the electrode part 3 of the capacitor element 2.

Description

  The present invention relates to a capacitor having a terminal connected to an electrode portion of a capacitor element.

  As shown in FIG. 4, a terminal 12 for connecting to other electronic components is usually connected to the electrode parts (metallicon parts) 11 provided at both ends of the capacitor element 10. 11 and the electronic component, it is necessary to make a stable connection, and thus, a plate-like terminal 12 that easily secures connection strength has been used (see, for example, Patent Documents 1 and 2).

Japanese Utility Model Publication No. 53-84045 Japanese Utility Model Publication No. 54-24040

  By the way, when connecting the terminal 12 to the metallicon part 11 of the capacitor element 10, the solder layer 13 provided in advance on the surface of the metallicon part 11 is melted or the molten solder 13 is supplied to the surface of the metallicon part 11 and this melting is performed. In many cases, a so-called solder connection in which the metallized portion 11 and the terminal 12 are connected by the solder 13 is used.

  However, as shown in Patent Documents 1 and 2 and FIG. 4, when the flat terminal 12 is brought into contact with the metallicon portion 11, the molten solder 13 is pushed away by the terminal 12 as shown in FIG. There is a case in which only a small amount of solder 13 remains between the metallicon part 11 and the metallized part 11 and a strong connection cannot be made.

  Also, since lead-free solder is often used in recent years, in the case of solder connection, a plated steel sheet with plating 12a for improving solder wettability is used as its material. However, in the terminal 12 formed by press-forming this plated steel sheet, as shown in FIG. 5, the base material having poor solder wettability is exposed from the end surface 12 b, so that the terminal 12 is simply brought into contact with the metallicon part 11. A sufficient amount of solder could not be adhered to the end face 12b only by contact.

  Accordingly, the present invention has been made to solve the above-described problem, and an object of the present invention is to provide a capacitor capable of firmly connecting the electrode portion and the terminal of the capacitor element with a simple configuration.

  In order to solve the above problems, a capacitor of the present invention includes a capacitor element 2 having an electrode portion 3 on an end face, a terminal 5 connected to the electrode portion 3 of the capacitor element 2, the capacitor element 2 and the terminal 5 And the terminal 5 has a plating layer 5a, the connection part 6 extending outward from the exterior part 8, and the electrode part 3 of the capacitor element 2 via the solder 4. The electrode connecting portion 7 is connected to the electrode connecting portion 7, and the electrode connecting portion 7 is characterized in that the surface having the plated layer 5 a is a concave portion 7 b facing the electrode portion 3 of the capacitor element 2.

  The concave portion 7b of the electrode connecting portion 7 is formed by curving the end portion 7a of the electrode connecting portion 7 toward the electrode portion 3 of the capacitor element 2, and the end surface 7c of the electrode connecting portion 7 is The end portion 7a is inclined toward the electrode portion 3 of the capacitor element 2 along with the curvature of the end portion 7a.

  According to the capacitor of the present invention, when the terminal is connected to the electrode portion of the capacitor element, even if the electrode connection portion of the terminal is brought into contact with the electrode portion of the capacitor element, the electrode connection portion is provided on the surface having the plated layer. Due to the concave portion, the molten solder surely remains between the concave portion and the electrode portion of the capacitor element, and a solder layer is filled and formed between the concave portion and the electrode portion. Therefore, the peel strength of the electrode connection portion is increased, the resistance to thermal shock is improved, and a firm connection between the terminal and the electrode portion of the capacitor element is possible.

  In addition, since the end of the electrode connecting portion is curved and the end surface of the electrode connecting portion is inclined toward the electrode portion of the capacitor element, the concave portion of the electrode connecting portion and the electrode portion of the capacitor element are opposed to each other. Then, the solder can be sandwiched between the end face of the electrode connecting portion and the electrode portion of the capacitor element, and the solder on the side of the electrode connecting portion can be satisfactorily adhered to the end face of the electrode connecting portion. As a result, the contact surface between the solder and the terminal increases, and the connection between the terminal and the electrode portion of the capacitor element can be made even stronger.

It is a perspective view showing a capacitor concerning an embodiment of the present invention. It is a perspective view which shows a terminal. It is sectional drawing which shows the connection state to the metallicon part of a terminal. It is a perspective view which shows the conventional capacitor | condenser. It is sectional drawing which shows the connection state to the metallicon part of the conventional terminal.

  Embodiments of a capacitor according to the present invention will be described below in detail with reference to the drawings. As shown in FIG. 1, the capacitor 1 of the present invention includes a capacitor element 2, a terminal 5, and an exterior portion 8.

  Capacitor element 2 is a film capacitor formed by, for example, winding a metallized film in which a metal is vapor-deposited on an insulating film in a cylindrical shape, and as shown in FIG. Electrode parts (metallicon parts) 3 and 3 formed by spraying (zinc) are formed. Also, a solder layer 4 formed by spraying solder is formed on the surface of the metallicon part 3. The capacitor element 2 is not limited to a film capacitor, and various known capacitor elements such as a ceramic capacitor can be used. Further, the shape is not limited to a cylindrical shape, and may be a cubic shape.

  As shown in FIG. 2, the terminal 5 has one end serving as a connection portion 6 used for connection with an external electronic component, and the other end used as an electrode connection portion 7 used for connection with the metallicon portion 3 of the capacitor element 2. It is said that. Specifically, the terminal 5 is formed by punching a plated steel plate having a plating 5a for improving solder wettability on both sides in a substantially convex shape, and one end having a narrow width is connected to the connection portion 6. The other end that is wide is the electrode connecting portion 7.

  Further, as shown in FIG. 2, the electrode connecting portion 7 has both end portions 7a and 7a in the width direction curved in the plate thickness direction and in the same direction (in the direction of the metallicon portion 3 in FIG. 3). It has an arc shape, and a substantially arc-shaped concave portion 7b is formed between both ends 7a and 7a in the width direction. In addition, the width direction end surface 7c of the electrode connection part 7 is in a state of being inclined toward the curved side (the metallicon part 3 side in the drawing) by curving the width direction end part 7a.

  The exterior portion 8 is a resin that covers the capacitor element 2 and the electrode connection portion 7 of the terminal 5, and various known resins such as an epoxy resin and a urethane resin can be used. The exterior portion 8 only needs to cover the capacitor element 2 and the electrode connection portion 7 of the terminal 5, and includes a case where the electrode connection portion 7 of the capacitor element 2 and the terminal 5 is used for resin molding. It is.

  In the capacitor 1 of the present invention, the electrode connecting portion 7 of the terminal 5 is connected to the metallicon portion 3 of the capacitor element 2, and the connecting portion 6 of the terminal 5 is extended outward so that the capacitor element 2 and the terminal 5 are connected. The electrode connection part 7 is configured by resin molding.

  In addition, in connecting the terminal 5 to the capacitor element 2, it was provided on the plated layer 5a side of the electrode connecting portion 7 in a state where the solder layer 4 previously provided on the surface of the metallicon portion 3 was melted by resistance welding or the like. The concave portion 7 b is opposed to the metallicon part 3 of the capacitor element 2, the electrode connecting part 7 is biased toward the metallicon part 3, and the electrode connecting part 7 is brought into contact with the metallicon part 3.

  In this case, as shown in FIG. 3, further biasing is restricted at the stage where the corners of the width direction end portions 7 a, 7 a of the electrode connecting portion 7 are in contact with the metallicon portion 3, that is, in the width direction. Since the both end portions 7a and 7a function as spacers, the molten solder 4 can be reliably left between the recess 7b and the metallicon portion 3. Therefore, the solder layer 4 corresponding to the depth of the concave portion 7b is formed between the concave portion 7b and the metallicon portion 3, the peeling strength of the electrode connection portion is increased, the resistance to thermal shock is improved, and the terminal 5 and A strong connection with the metallicon part 3 becomes possible.

  In addition, since the width direction end face 7c of the electrode connecting portion 7 is inclined toward the metallicon part 3, the width direction end face 7c and the metallicon part 3 are brought into contact with the metallicon part 3 by bringing the width direction both end parts 7a, 7a into contact with the metallicon part 3. Thus, the solder 4 can be satisfactorily adhered to the width direction end surface 7c even though the plating layer 5a is not applied to the width direction end surface 7c. And since the solder layer 4 is formed also in the width direction end surface 7c, the contact surface of the solder 4 and the terminal 5 increases compared with the conventional thing in which the solder 4 does not adhere to the width direction end surface 7c. 5 and the metallicon part 3 can be further strengthened.

  Although specific embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the present invention. For example, in the above embodiment, the solder layer 4 is provided in advance on the surface of the metallicon part 3, but when the terminal 5 is connected to the metallicon part 3 without providing the solder layer 4 on the surface of the metallicon part 3, molten solder You may make it supply 4 to the metallicon part 3 surface. Moreover, in the said Example, although the zinc layer 3 was called the electrode part (metallicon part), what combined the zinc layer 3 and the solder layer 4 is good also as an electrode part (metallicon part). The shape of the terminal 5 is not limited to a substantially convex shape, and may be various shapes such as a strip shape. However, if the connecting portion 6 is curved, there is a possibility that the connection with an external electronic component may be hindered. For example, the electrode connecting portion 7 may be bent by making a notch between the connecting portion 6 and the electrode connecting portion 7. However, it is preferable that the connecting portion 6 has a shape that does not curve.

  1..Capacitor 2..Capacitor element 3 ... Electrode part 4..Solder 5..Terminal 5a..Plating 6 ... Connection part 7..Electrode connection part 7a..End part , 7b .. Recess, 7c .. End face, 8 .. Exterior part

Claims (2)

  Capacitor element (2) having an electrode part (3) on the end face, terminal (5) connected to electrode part (3) of capacitor element (2), capacitor element (2) and terminal (5) And a connection portion (6) having a plating layer (5a) and extending outward from the exterior portion (8). And an electrode connection part (7) connected to the electrode part (3) of the capacitor element (2) via a solder (4), and the electrode connection part (7) has a plating layer (5a). The capacitor | condenser by which the surface to have is made into the recessed part (7b) facing the electrode part (3) of the said capacitor | condenser element (2).   The concave portion (7b) of the electrode connection portion (7) is formed by bending the end portion (7a) of the electrode connection portion (7) toward the electrode portion (3) of the capacitor element (2). The end face (7c) of the electrode connecting portion (7) is inclined toward the electrode portion (3) of the capacitor element (2) as the end portion (7a) is curved. 1. The capacitor according to 1.