JP2013165154A - Resin sealing electric component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resin seal electric component which prevents resin leakage to the exterior of a case in the electric component which allows a terminal part to penetrate through a case wall part and be led out.SOLUTION: An electric component 20 is housed in a case 10, and a terminal part 31 of an electrode plate 30 connected with the electric component 20 is inserted into a first through hole 14 provided at a case wall part and a second through hole 19 provided at a resin accumulation part 15 which covers the first through hole 14 from the exterior side of the case wall part thereby being led out to the exterior of the case 10. Further, a resin 40 is disposed at a gap between the first through hole 14 and the terminal part 31 and a resin 50 fills the case 10. A resin seal electric component is formed with this structure.

Description

  The present invention relates to a resin-encapsulated electrical component in which a terminal portion is pulled out of a case and the case is filled with resin.

  In a capacitor in which an electrical component such as a capacitor element is housed in a case and filled with a resin, the terminal portion of the electrode plate connected to the electrical component is pulled out of the case from a through hole provided in the case wall. As disclosed in Patent Document 1, it has been conventionally performed.

  By the way, in the capacitor of the above configuration, when the resin is filled in the case, there is a risk that the resin leaks from a gap generated between the through hole and the terminal portion. The gap formed between the through hole and the terminal portion is made as small as possible by suppressing the resin leakage.

JP 2000-331868 A

  However, if the size of the through hole is the same as or slightly smaller than that of the terminal portion, the friction between the hole wall of the through hole and the terminal portion increases, which may hinder the insertion operation.

  In addition, if a slight gap occurs between the through hole and the terminal portion due to manufacturing errors of the through hole or the terminal portion, the resin may leak due to surface tension (capillary phenomenon), which is not always effective. It was not a measure.

  Accordingly, the present invention has been made to solve the above-described problem, and in an electrical component that penetrates the case wall portion and draws out the terminal portion, resin sealing that can prevent resin leakage to the outside of the case The purpose is to provide electrical components.

  In order to solve the above-described problems, the resin-encapsulated electrical component of the present invention is configured such that the electrical component 20 is accommodated in the case 10 and the terminal portion 31 of the electrode plate 30 connected to the electrical component 20 is provided on the case wall portion. By inserting the first through hole 14 and the second through hole 19 provided in the resin storage portion 15 covering the first through hole 14 from the outside of the case wall portion, it is pulled out to the outside of the case 10. The resin 40 is interposed in the gap between the first through hole 14 and the terminal portion 31, and the case 50 is filled with the resin 50.

  The second through hole 19 includes an enlarged inclined portion 19b that gradually increases the hole diameter toward the side opposite to the case wall portion. Further, a first through hole 14 and a resin reservoir 15 are provided in the case bottom 11 facing the case opening 13.

  According to the resin-encapsulated electrical component of the present invention, the resin storage portion that covers the first through hole is provided outside the case wall portion, and the resin is interposed in the gap formed between the first through hole and the terminal portion. Therefore, even if the case is filled with resin, resin leakage from the first through hole to the outside of the case (resin storage portion side) can be prevented. In addition, the second through hole is provided with an enlarged inclined portion that gradually increases the hole diameter toward the side opposite to the side filled with the resin, that is, the terminal portion is inserted into the second through hole. In this state, the gap between the terminal portion and the second through hole is continuously changed from the gap at which the capillary phenomenon occurs to the gap at which the capillary phenomenon does not occur, so that the capillary phenomenon occurs. At the limit interval, the resin can be stopped by the surface tension to reduce the surface area, and the resin leakage from the second through hole to the outside of the case can also be prevented. Accordingly, the terminal portion can be pulled out from the bottom of the case while preventing resin leakage, and the terminal portion can be pulled out at the shortest distance when connecting to an external electric device or the like provided on the case bottom. Therefore, compared with the case where the terminal portion extends from the case opening side to the case bottom side, the shape of the terminal portion can be simplified, and the connection distance to an electrical device or the like can be shortened. In addition, low ESR (equivalent series resistance) and low inductance can be achieved.

It is a perspective view which shows the resin sealing electrical component which concerns on embodiment of this invention. It is the disassembled perspective view which cut out a part of the resin sealing electrical component similarly. Similarly, it is a cross-sectional view of the resin-encapsulated electrical component. FIG. 4 is an enlarged view of a main part of FIG. 3.

  Next, an embodiment of the resin-encapsulated electrical component of the present invention will be described in detail with reference to the drawings. As shown in FIGS. 1 to 4, the resin-encapsulated electrical component 1 of the present invention houses the electrical component 20 in the case 10, and connects the terminal portion 31 of the electrode plate 30 connected to the electrical component 20 to the outside of the case 10. The resin storage portion 15 is filled with the resin 40, and the case 10 is further filled with the resin 50. Hereinafter, individual components of the resin-encapsulated electrical component 1 will be described in detail.

  As shown in FIGS. 1 and 2, the case 10 includes a case bottom 11 and case side walls 12 extending from the four sides of the case bottom 11 substantially orthogonal to the case bottom 11. The opening 13 for accommodating the electrical component 20 and the electrode plate 30 in the internal space of the case 10 is provided on the surface facing the case bottom 11.

  Further, as shown in FIGS. 2 to 4, a portion projecting toward the inside of the case 10 is provided inside the case bottom portion 11, and the terminal portion 31 of the electrode plate 30 is connected to the projecting portion 11 a of the case 10. A first through hole 14 is formed for drawing out to the outside. As shown in FIG. 4, the first through-hole 14 has a plate thickness (projecting portion 11 a) of the case bottom 11 from the outer surface of the case bottom 11 (resin storage portion 15 side described later) in a state where the terminal portion 31 is inserted. The thickness of the case bottom 11 is approximately the same as the cross-sectional shape of the terminal portion 31, and is formed along the terminal portion 31. From the vicinity of the center to the inner surface of the case bottom 11 (inner case inner side), it is formed to be enlarged and inclined so as to be separated from the terminal portion 31 toward the inner surface of the case bottom 11. In addition, hereinafter, for the sake of explanation, a portion formed along the terminal portion 31 and having a constant hole diameter is formed to be enlarged and inclined so as to be separated from the straight portion 14a and the terminal portion 31, and the hole diameter is The part that is gradually enlarged is referred to as an enlarged inclined portion 14b.

  On the other hand, on the outside of the case bottom 11, as shown in FIGS. 1 to 4, there is a resin reservoir 15 for supplying the resin 40 to the gap formed between the first through hole 14 and the terminal portion 31. Is provided. As shown in FIG. 4, the resin reservoir 15 includes a resin reservoir bottom 16 provided below the first through hole 14 and an upper side from three sides of the resin reservoir bottom 16 that are not in contact with the case bottom 11. And a resin storage wall portion 17 extending toward the surface, and an opening 18 for filling the resin storage portion 15 with the resin 40 is formed on a surface facing the resin storage bottom portion 16. Is provided. That is, the resin storage portion 15 has a pocket shape with a space in which the resin 40 can be filled, and is provided so as to cover the first through hole 14 from the outside. By filling the resin 40, the first through hole 14 and the terminal portion 31 that penetrates the first through hole 14 and is located in the resin storage portion 15 can be embedded in the resin 40. .

  Further, as shown in FIGS. 2 to 4, the resin storage wall portion 17 facing the case bottom portion 11 has a second penetration for inserting the terminal portion 31 at a position facing the first through hole 14. A hole 19 is formed. As shown in FIG. 4, the second through hole 19 is formed from the inner surface 17 a of the resin reservoir wall portion 17 (the side filled with the resin 40 and the case bottom 11 side) in a state where the terminal portion 31 is inserted. Near the center of the thickness of the storage wall portion 17, it is formed along the terminal portion 31 in substantially the same shape as the cross section of the terminal portion 31, and the resin storage wall starts from approximately the center of the thickness of the resin storage wall portion 17. The outer surface 17b of the portion 17 (on the side not filled with the resin 40 and on the side opposite to the case bottom 11) is formed so as to be inclined to be separated from the terminal portion 31 toward the outer surface 17b of the resin reservoir wall portion 17. Has been. That is, the second through-hole 19 is also provided with a straight portion 19a and an enlarged inclined portion 19b.

  As shown in FIG. 2, a rib portion 12 a for facilitating positioning of the electrical component 20 and the electrode plate 30 in the case 10 is provided on the inner surface side of the case side wall portion 12. In FIG. 2, two rib portions 12a are provided, but may be one or three or more. Moreover, the rib part 12a is formed only in one case side wall part 12 among four case side wall parts 12 .... However, you may provide in any two or three case side wall parts 12. Alternatively, all the case side wall portions 12 may be provided.

  The electrical component 20 is a film capacitor formed by, for example, winding a metallized film in which a metal is deposited on an insulating film. As shown in FIG. 2, the metal is sprayed on both end surfaces in the axial direction. The electrode portions 21 and 21 are formed, and the electrode plate 30 is connected to the electrode portion 21 to be integrated with the electrode plate 30. The electrical component 20 is not limited to a film capacitor, and various capacitors may be used. The electrical component 20 is not limited to a capacitor, and various electrical components may be used.

  As shown in FIG. 2, the electrode plate 30 serves as a base for the two terminal portions 31, 31 extending in opposite directions and the terminal portions 31, 31 and for connection to the electrical component 20. It is comprised from the flat-plate-shaped main-body part 32 provided. In addition, the terminal portion 31 inserted through the first and second through holes 14 and 19 (hereinafter referred to as one terminal portion 31) has a resin reservoir at a position facing the opening 18 of the resin reservoir 15. A through hole 33 is formed to allow the resin 40 to flow into the bottom 16 side. The main body 32 is formed with a connection hole 34 used for connection to the electrical component 20, and the terminal 31 is formed with a connection hole 35 used for connection to an external electrical device or the like.

  The resin 40 filled in the resin reservoir 15 and the resin 50 filled in the case 10 are made of the same kind of epoxy resin, for example. The resin 40 filled in the resin reservoir 15 is a gap closing resin that is intended to be interposed in a gap formed between the first through hole 14 and the terminal portion 31. The resin 50 filled in is a sealing resin for the purpose of resin-sealing the electrical component 20 and the electrode plate 30, and therefore it is not necessary to use the same kind of resin, and to achieve each purpose. A suitable resin may be used.

  Next, the assembly of the resin-encapsulated electrical component 1 of the present invention will be described in detail. In assembling the resin-encapsulated electrical component 1, first, the electrode parts 21, 21 of the electrical component 20 and the body parts 32, 32 of the two electrode plates 30, 30 are respectively connected by, for example, soldering, etc. 20 and the electrode plate 30 are integrated. Then, the electric component 20 and the electrode plate 30 integrated with each other are accommodated in the case 10 from the one terminal portion 31 side so that the one terminal portion 31 is inserted into the first through hole 14. Go. In addition, the rib part 12a is provided in the inner surface side of the case side wall part 12, and the movement of the electrical component 20 and the electrode plate 30 in the case 10 (particularly the downward movement in FIG. 2) is restricted. Since the rib portion 12 a functions as positioning, it is easy to insert one terminal portion 31 into the first through hole 14.

  After inserting the one terminal portion 31 into the first through hole 14, the electric component 20 and the electrode plate 30 are further pushed into the case 10, so that the one terminal portion 31 is removed from the first through hole 14. It protrudes from the second through hole 19 to the outside of the case 10 through the resin reservoir 15. When the electric component 20 and the electrode plate 30 are pushed into the case 10 to some extent, the electrode plate 30 comes into contact with the protruding portion 11a provided inside the case bottom portion 11, that is, the protruding portion. Since 11a functions as positioning, the drawing length of one terminal portion 31 can be made constant by a simple operation of simply pushing in the electrical component 20 and the electrode plate 30. As shown in FIG. 3, the other terminal portion 31 is pulled out from the case opening 13 to the outside of the case 10 when the electrical component 20 and the electrode plate 30 are housed in the case 10. ing.

  After one terminal portion 31 is pulled out of the case 10, the resin reservoir 15 is filled with the resin 40 before the case 50 is filled with the resin 50. At this time, the resin 40 filled in the resin storage portion 15 penetrates to the resin storage bottom portion 16 through the through hole 33 provided in the one terminal portion 31. Therefore, the resin 40 can be spread over the outer periphery of the terminal portion 31, and a gap formed between the terminal portion 31 and the first through hole 14 or between the terminal portion 31 and the second through hole 19. The resin 40 can be interposed (closed by the resin 40) in the generated gap. The second through hole 19 is formed with an enlarged inclined portion 19b on the side opposite to the side filled with the resin 40 (outside the resin storage portion 15), that is, the terminal portion 31 and the second through hole 19. Since the gap between the through holes 19 is continuously changed from the gap where the capillary phenomenon occurs to the gap where the capillary phenomenon does not occur, the surface area is reduced at the limit gap where the capillary phenomenon occurs. The resin 40 can be stopped by the surface tension to be obtained, and the resin leakage from the second through hole 19 to the outside of the case 10 can be reliably prevented. Further, in the first through hole 14, the enlarged inclined portion 14 b is formed on the side opposite to the side filled with the resin 40 (inside the case 10). Therefore, for the same reason as the second through hole 19. The resin leakage from the first through hole 14 to the inside of the case 10 can be prevented.

  Then, after the resin 40 filled in the resin reservoir 15 is cured, the resin 50 is filled in the case 10 and the electrical component 20 and the electrode plate 30 are sealed with resin, so that the assembly of the resin-sealed electrical component 1 can be performed. Although completed, as described above, the gap formed between the first through hole 14 and the terminal portion 31 is blocked by the resin 40 previously filled in the resin storage portion 15. There is no possibility that the resin 50 leaks from the through hole 14 to the outside of the case 10 (on the side of the resin reservoir 15).

  Further, the resin-encapsulated electrical component 1 having the above configuration has a configuration in which the terminal portion 31 is pulled out to the outside of the case 10 by penetrating the case bottom portion 11, that is, an external electrical device provided on the case bottom portion 11 side. Since the terminal portion 31 is pulled out at the shortest distance when connecting to the terminal portion 31 or the like, the shape of the terminal portion 31 is larger than when the terminal portion 31 extends from the case opening 13 side to the case bottom 11 side. Can be made simple, and a connection distance with an electric device or the like can be shortened, and low ESR (equivalent series resistance) and low inductance can be achieved.

  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, one terminal portion 31 is drawn out of the case 10 from the case bottom 11, but the terminal portion 31 may be drawn out of the case 10 from the case side wall portion 12. In the above embodiment, the first through hole 14 also includes the straight portion 14a and the enlarged inclined portion 14b. However, the resin 40 prefilled in the resin reservoir 15 leaks into the case 10 inside. When this is allowed, it is not necessary to provide the enlarged inclined portion 14b. Even in this case, since the resin 40 remains in the linear portion 14a due to the surface tension, the gap formed between the first through hole 14 and the terminal portion 31 can be blocked by the resin 40, and the first Resin leakage from the through hole 14 to the outside of the case 10 can be prevented. Furthermore, the enlarged inclined portion 19 b may not be provided in the second through hole 19. This is because the capacity of the resin reservoir 15 is smaller than the capacity of the case 10, and the distance from the second through hole 19 to the liquid level of the resin 40 is such that the distance from the first through hole 14 to the resin 50. This is because the resin is less likely to leak than the first through-hole 14 because the distance to the liquid surface is small, and even if a resin leak occurs, the amount of resin that leaks is limited. is there.

  In the above embodiment, the one terminal portion 31 is provided with the through hole 33 for communicating the opening 18 side and the bottom portion 16 side of the resin reservoir portion 15, but instead of providing the through hole 33. In addition, for example, by providing a notch in the terminal portion 31 and providing a gap between the terminal portion 31 and the resin reservoir walls 17 and 17 located on both sides of the terminal portion 31, the resin reservoir bottom portion 16 side is provided. The flow of the resin 40 may be allowed. In FIG. 4, a sufficient space (space) for filling the resin 40 is formed between the inner side surface of the resin storage bottom portion 16 and the lower side surface of the terminal portion 31. As shown in the portion, a slight gap may be formed between the inner side surface of the resin reservoir bottom portion 16 and the lower side surface of the terminal portion 31. In this case, the mold structure for forming the case 10 can be simplified and the amount of resin can be reduced. Even in the above configuration, since the resin 40 oozes between the inner side surface of the resin storage bottom portion 16 and the lower side surface of the terminal portion 31, a gap generated between the terminal portion 31 and the first through hole 14, A gap formed between the terminal portion 31 and the second through hole 19 can be closed by the resin 40. In addition, the lengths of the straight portions 14a and 19a and the enlarged inclined portions 14b and 19b in the first and second through holes 14 and 19 are respectively about half of the plate thickness, but one of them is made large. Also good. A plurality of linear portions 14a and 19a and enlarged inclined portions 14b and 19b may be provided. That is, after the straight portions 14a and 19a, the enlarged inclined portions 14b and 19b are provided, and the linear portions 14a and 19a are further provided outside the enlarged inclined portions 14b and 19b. A plurality of inclined portions 14b and 19b may be provided continuously. Even in such a case, since the occurrence of capillary action can be suppressed by the enlarged inclined portions 14b and 19b, resin leakage can be prevented.

  1 .. Resin-sealed electrical parts, 10 .. Case, 11 .. Case bottom, 13 .. Case opening, 14 .. First through hole, 15 .. Resin reservoir, 19. Hole, 19b .... Enlarged inclined part, 20..Electrical component, 30..Electrode plate, 31..Terminal part, 40, 50..Resin

Claims (3)

  The electrical component (20) is accommodated in the case (10), and the terminal portion (31) of the electrode plate (30) connected to the electrical component (20) is connected to the first through-hole (14 ) And the second through hole (19) provided in the resin reservoir (15) that covers the first through hole (14) from the outside of the case wall, so that the outside of the case (10) A resin seal formed by pulling out, interposing a resin (40) in the gap between the first through hole (14) and the terminal portion (31), and further filling the case (10) with the resin (50). Stop electrical parts.   2. The resin-encapsulated electrical component according to claim 1, wherein the second through hole (19) includes an enlarged inclined portion (19 b) that gradually enlarges the hole diameter toward the side opposite to the case wall portion.   The resin-encapsulated electrical component according to claim 1 or 2, wherein the first through hole (14) and the resin reservoir (15) are provided in the case bottom (11) facing the case opening (13).