JP2007150021A - Capacitor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To raise reliability in a capacitor by suppressing a crack in a sealing resin due to a thermal shock concerning a draw-out part from the sealing resin in terminals for external connection. <P>SOLUTION: A plurality of capacitor elements 2 are stored in a case 1 so as to fill it with a resin 8. Then the terminals 6, 7 for external connection are projected from a case opening 9, drawn out from a part between the capacitor element 2a and the capacitor element 2b, and projected outward from the case opening 9. A resin thickness A is fully secured in the draw-out part of the respective terminals 6, 7 for external connection. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a capacitor in which a capacitor element is housed in a case and filled with resin.

FIG. 3 shows a conventional example of a capacitor in which a plurality of capacitor elements are housed in a case and filled with resin (see, for example, Patent Document 1 and Patent Document 2). In this capacitor, a plurality of multilayer capacitor elements 22 are provided in the case 21, and a metallicon electrode 23 is formed on the end face of each capacitor element 22. In addition, a pair of electrode plates 24 and 25 are disposed to face each other via an insulator (not shown), and the element connection portions 24a and 25a of the electrode plates 24 and 25 are connected to the metallicon electrodes 23, respectively. It is connected. External connection terminals 26 and 27 are integrally formed on the electrode plates 24 and 25. The case 21 is filled with an epoxy resin 28, the capacitor elements 22 are resin-sealed, and the external connection terminals 26 and 27 are projected from the case opening 29 to the outside. . In this case, each of the external connection terminals 26 and 27 is led out from between the capacitor element 22 and the inner surface of the side wall of the case 21.
Japanese Patent Application No. 2005-57002 JP 2003-133172 A

  By the way, in the above conventional capacitor, cracks may occur in the sealing resin 28 due to thermal shock at the lead-out portions of the external connection terminals 26 and 27 from the sealing resin 28. This is because the resin thickness A between the external connection terminals 26 and 27 and the side wall inner surface of the case 21 is thin, and the side B on which the capacitor element 22 exists with the external connection terminals 26 and 27 as a boundary. It is conceivable that there is a large difference in the amount of resin with respect to the internal depth direction of the case 21 on the nonexistent side (side wall side of the case 21) C.

  The present invention has been made to solve the above-mentioned conventional drawbacks, and its purpose is to suppress cracking in the sealing resin due to thermal shock at the lead-out portion of the external connection terminal from the sealing resin. It is therefore possible to provide a capacitor with improved reliability.

  Therefore, the capacitor according to the present invention is a capacitor in which a plurality of capacitor elements 2 are accommodated in the case 1 and filled with the resin 8, and the external connection terminals 6 and 7 are projected from the case opening 9, and the capacitor element 2a and the capacitor element 2b, the external connection terminals 6 and 7 are drawn out and protruded from the case opening 9 to the outside.

  The capacitor according to the present invention is characterized in that the plurality of capacitor elements 2 are multilayer capacitor elements.

  According to the capacitor of the present invention, each of the external connection terminals 6 and 7 is drawn out from between the capacitor element 2a and the capacitor element 2b. Therefore, from the sealing resin 8 of each of the external connection terminals 6 and 7 In the lead-out portion, it is possible to sufficiently secure the resin thickness A in the both side directions of the external connection terminals 6 and 7. Further, on both sides of the external connection terminals 6 and 7, there is no significant difference in the resin amount with respect to the internal depth direction of the case 1, and the resin amounts B and C on both sides can be made substantially equal. Accordingly, it is possible to prevent cracks from occurring in the sealing resin 8 due to thermal shock at the lead-out portions of the external connection terminals 6 and 7 from the sealing resin 8, thereby improving the reliability of the capacitor.

  Next, specific embodiments of the capacitor of the present invention will be described in detail with reference to the drawings. As shown in FIGS. 1 and 2, in this capacitor, a plurality of multilayer capacitor elements 2 are provided in a case 1, and metallicon electrodes 3 are formed on both end faces of each capacitor element 2. In addition, a pair of electrode plates 4 and 5 are arranged to face each other via an insulator (not shown), and the element connection portions 4a and 5a of the electrode plates 4 and 5 are connected to the metallicon electrodes 3, respectively. It is connected. External connection terminals 6 and 7 are integrally formed on each of the electrode plates 4 and 5. The case 1 is filled with an epoxy resin 8, the capacitor elements 2 are sealed with resin, and the external connection terminals 6 and 7 are projected from the case opening 9 to the outside. .

  The characteristic point in this embodiment is that each of the external connection terminals 6 and 7 is located at the outermost end portion of the case 1 and the capacitor element 2b disposed adjacent to the inner side. It is pulled out from between. The metallicon electrode 3 of the capacitor element 2a located at the outermost end of the case 1 is connected to the external connection terminals 6 and 7 in the same manner as the one located inside.

  In the capacitor, the external connection terminals 6 and 7 are connected to the outside from between the capacitor element 2a located at the outermost end of the case 1 and the capacitor element 2b arranged adjacent to each other inside. Since the external connection terminals 6 and 7 are pulled out from the sealing resin 8, the resin thickness (resin width) A between the external connection terminals 6 and 7 and the side wall inner surface of the case 1 is set. It is possible to ensure sufficiently. Further, on both sides of the external connection terminals 6 and 7, there is no significant difference in the resin amount with respect to the internal depth direction of the case 1, and the resin amounts (resin depths) B and C on both sides can be made substantially equal. Accordingly, it is possible to prevent cracks from occurring in the sealing resin 8 due to thermal shock at the lead-out portions of the external connection terminals 6 and 7 from the sealing resin 8, thereby improving the reliability of the capacitor.

  Although the specific embodiment of the capacitor of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications can be made within the scope of the present invention. . For example, in the above embodiment, the external connection terminals 6 and 7 are arranged between the capacitor element 2a located at the outermost end of the case 1 and the capacitor element 2b arranged adjacent to each other inside. However, it may be drawn from between any capacitor elements 2 of the capacitor elements 2 arranged side by side. Further, the present invention is not limited to the capacitor using the multilayer capacitor element 2 but can be implemented in the same manner as described above even in a capacitor having a wound flat capacitor element.

1 is a schematic perspective view of a capacitor according to an embodiment of the present invention. It is a schematic sectional drawing of the capacitor | condenser in the said embodiment. It is a schematic sectional drawing of the conventional capacitor | condenser.

Explanation of symbols

    DESCRIPTION OF SYMBOLS 1 ... Case, 2 ... Capacitor element, 3 ... Metallicon electrode, 4, 5 ... Electrode plate, 6, 7 ... Terminal for external connection, 8 ... Sealing resin, 9 * ..Case opening

Claims (2)

  In a capacitor in which a plurality of capacitor elements (2) are housed in a case (1) and filled with resin (8) and the external connection terminals (6) and (7) are projected from the case opening (9), the capacitor element A capacitor characterized in that the external connection terminals (6) and (7) are drawn from between the capacitor element (2a) and the capacitor element (2b) and protruded to the outside from the case opening (9).   The capacitor according to claim 1, wherein the plurality of capacitor elements are multilayer capacitor elements.