JP2014099459A - Current auxiliary member and print circuit board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a current auxiliary member capable of reducing electric resistance, flowing a large current by improving heat dissipation, and improving processability and solderability, and a printed circuit board having the same.SOLUTION: A current auxiliary member 1 has four or more of terminals 2, a conductive connection part 3, and a heat dissipation part 4. Four or more of terminals 2 are used for connecting to a conductive part 11. The conductive connection part 3 is arranged so as to face to a surface of a printed circuit board 10, and electrically connects four or more of terminals 2 with each other. The heat dissipation part 4 extends from the conductive connection part 3 to an opposite side of the printed circuit board. The conductive connection part 3 contains a plurality of recess parts 5 having dimensions being larger than widths of each of four or more of terminals 2.

Description

  The present invention relates to a current auxiliary member and a printed board, and more particularly to a current auxiliary member for connecting to a conductive connection provided on the surface of a printed board and a printed board including the current auxiliary member.

  Conventionally, a wiring pattern on a printed board having a thickness of about 55 μm including the plating thickness is generally used. In the wiring pattern having such a thickness, since a cross-sectional area through which a current flows is small, a large current cannot be supplied. Therefore, a current auxiliary member is used to pass a large current. This current auxiliary member is provided to assist the wiring pattern. A current auxiliary member in which a metal conductor of sheet metal is soldered to a printed board is disclosed in, for example, Japanese Patent Application Laid-Open No. 2010-62249 (Patent Document 1).

JP 2010-62249 A

  In the current auxiliary member disclosed in the above publication, in order to pass a large current, it is necessary to increase the cross-sectional area through which the current flows by increasing the thickness of the metal conductor of the sheet metal to reduce the electrical resistance. . However, a metal conductor having a large plate thickness has a problem of poor workability and difficulty in soldering to a printed circuit board. In addition, the current auxiliary member disclosed in the above publication has a problem of poor heat dissipation.

  The present invention has been made in view of the above-described problems, and its purpose is to reduce electrical resistance and improve heat dissipation so that a large current can be passed, and processability and solderability are improved. It is an object to provide a current assisting member that can be improved and a printed circuit board including the current assisting member.

  The current auxiliary member of the present invention is for connection to a conductive portion provided on the surface of a printed circuit board. The current auxiliary member includes four or more terminals, a conductive connection portion, and a heat dissipation portion. Four or more terminals are for connection to the conductive part. The conductive connection portion is disposed so as to face the surface of the printed circuit board, and electrically connects each of the four or more terminals. The heat radiating portion extends from the conductive connection portion to the side opposite to the printed circuit board side. The conductive connection portion includes a plurality of recesses having dimensions larger than the width of each of the four or more terminals.

  According to the current auxiliary member of the present invention, the electrical resistance can be reduced by increasing the cross-sectional area through which the current flows by the conductive connection portion. Moreover, heat dissipation can be improved by dissipating heat by the heat dissipation part. For this reason, a large current can be applied. Furthermore, with four or more terminals, the cross-sectional area for each terminal can be reduced to improve workability and solderability. In addition, since the conductive connection portion includes a plurality of recesses having dimensions larger than the width of each of the four or more terminals, the other current auxiliary member is provided in the recess of the conductive connection portion of one current auxiliary member. By arranging the terminals of the conductive connection part, the one and the other current auxiliary members can be arranged to overlap each other. The total cross-sectional area of the conductive connecting portion can be increased by arranging the one and the other current auxiliary members in an overlapping manner. Thereby, electrical resistance can be reduced. Further, by arranging the one and the other current assisting members in an overlapping manner, the cross-sectional area of each terminal of the one and the other current assisting members can be further reduced to improve the workability and the solderability.

It is a perspective view which shows roughly the electric current auxiliary member in one embodiment of this invention. It is a top view which shows roughly the electric current auxiliary member in one embodiment of this invention. It is a front view which shows roughly the electric current auxiliary member in one embodiment of this invention. It is a side view which shows roughly the electric current auxiliary member in one embodiment of this invention. It is a perspective view which shows roughly a mode that the electric current auxiliary member in one embodiment of this invention was connected to the printed circuit board. It is a top view which shows roughly a mode that the 1st and 2nd electric current auxiliary member in one embodiment of this invention was piled up mutually. It is a schematic sectional drawing which follows the VII-VII line of FIG. It is a schematic sectional drawing of the electric current auxiliary member of the modification 1 in one embodiment of this invention, Comprising: It is a figure of the cross-sectional position corresponding to FIG. It is a top view which shows roughly a mode that the 1st and 2nd electric current auxiliary member of the modification 2 in one embodiment of this invention was piled up mutually. 1 is a perspective view schematically showing a printed circuit board in an embodiment of the present invention. 1 is an enlarged perspective view schematically showing a portion of a printed circuit board to which a current auxiliary member and a heat sink are connected in an embodiment of the present invention. It is an enlarged plan view which shows roughly the part to which the current auxiliary member and heat sink of the printed circuit board in one embodiment of this invention were connected.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
Initially, with reference to FIGS. 1-4, the structure of the electric current auxiliary member of one embodiment of this invention is demonstrated.

  Referring mainly to FIG. 1 and FIG. 2, current assisting member 1 of one embodiment of the present invention is for connection to a conductive portion provided on the surface of a printed circuit board. The current auxiliary member 1 may be formed by bending a single plate-like metal. The thickness of the current auxiliary member 1 is, for example, not less than 0.5 mm and not more than 1 mm. The material of the current auxiliary member 1 is pure copper, for example. The current auxiliary member 1 mainly has four terminals 2, a conductive connection portion 3, and a heat dissipation portion 4. Although the case where the number of terminals 2 is four will be described here, it may be four or more.

  The four terminals 2 are for connecting to the conductive part of the printed circuit board. The four terminals 2 are formed so as to extend downward. The four terminals 2 are respectively disposed at the four corners of the conductive connection portion 3. The conductive connection portion 3 is disposed so as to face the surface of the printed board. The conductive connection part 3 electrically connects each of the four or more terminals 2. The conductive connection portion 3 is formed in a plate shape. The conductive connection part 3 may be arranged in parallel to the surface of the printed circuit board.

  The heat radiation part 4 extends from the conductive connection part 3 to the side opposite to the printed circuit board side. The heat radiating part 4 is formed to extend upward. The heat radiation part 4 is formed in a plate shape. The heat radiation part 4 is arranged between the two terminals 2 in plan view. The conductive connection part 3 has a plurality of recesses 5. The plurality of recesses 5 have dimensions larger than the widths of the four or more terminals 2. Each of the plurality of recesses 5 is formed to be recessed inward from the outer peripheral end in plan view. Each of the plurality of recesses 5 is disposed between the terminal 2 and the heat dissipation part 4 in plan view.

  As shown in FIG. 3, the four terminals 2 are bent downward from the conductive connection portion 3. The heat radiating part 4 is bent upward from the conductive connecting part 3. The heat dissipating part 4 may be formed at an angle of 90 degrees with respect to the conductive connecting part 3. As will be described later, the heat dissipating part 4 only needs to be formed so that a plurality of current auxiliary members 1 are arranged so as to overlap each other. The heat dissipating part 4 has an angle exceeding 90 degrees with respect to the conductive connecting part 3. It may be formed.

  As shown in FIG. 4, the width D <b> 1 of the recess 5 is larger than the width W <b> 1 of the terminal 2. That is, the distance between the terminal 2 and the heat radiating portion 4 is larger than the width W1 of the terminal 2. Here, the width W1 of the terminal 2 is the width of one terminal 2 in the direction in which the heat radiating portion 4 is sandwiched.

  Next, with reference to FIG. 5 and FIG. 6, a state in which the current auxiliary member 1 is connected to the printed circuit board 10 will be described. The current flowing through the conductive portion 11 of the printed circuit board 10 flows from the terminal 2 of the current auxiliary member 1 upstream in the current direction (arrow direction in the figure) A to the conductive connection portion 3, and the terminal 2 downstream in the current direction A. To the conductive portion 11.

  In one embodiment of the present invention, a plurality of current auxiliary members 1 are used. The plurality of current assisting members 1 have the same shape. Of the plurality of current auxiliary members 1, a first current auxiliary member 1A and a second current auxiliary member 1B are overlapped with each other. The first current auxiliary member 1 </ b> A and the second current auxiliary member 1 </ b> B are overlapped with each other by being inverted 180 degrees along the surface of the printed circuit board 10. The first current assisting member 1A and the second current assisting member 1B are first sandwiched between the conductive connecting portion 3 of the first current assisting member 1A and the conductive connecting portion 3 of the second current assisting member 1B. The heat radiation part 4 of the current auxiliary member 1A and the heat radiation part 4 of the second current auxiliary member 1B are arranged so as to face each other.

  Referring mainly to FIG. 6, any of the four or more terminals 2 of the second current auxiliary member 1B is disposed in any of the plurality of recesses 5 of the first current auxiliary member 1A. One of the terminals 2 on the downstream side in the current direction A of the first current auxiliary member 1A is inserted from above between the terminal 2 of the second current auxiliary member 1B and the heat radiating portion 4, and the other is the second one. It is inserted from above between the terminals of the current auxiliary member 1B. The two terminals 2 on the upstream side in the current direction A of the first current auxiliary member 1A are arranged on the upstream side in the current direction A of the two terminals 2 of the second current auxiliary member 1B, respectively.

  Further, one of the terminals 2 on the upstream side in the current direction A of the second current auxiliary member 1 </ b> B is between the one of the terminals 2 on the upstream side in the current direction A of the first current auxiliary member 1 </ b> A and the heat radiation part 4 in plan view. The other is disposed between the terminals of the first current auxiliary member 1A. Further, the two terminals 2 on the downstream side in the current direction A of the second current auxiliary member 1B are respectively arranged on the downstream side in the current direction A of the two terminals 2 of the first current auxiliary member 1A.

  Next, with reference to FIG. 7, a state in which each terminal 2 of the first current auxiliary member 1 </ b> A and the second current auxiliary member 1 </ b> B is connected to the printed board 10 will be described. The printed circuit board 10 has a plurality of through holes 12. The plurality of through holes 12 are formed so that the respective terminals 2 of the first current auxiliary member 1A and the second current auxiliary member 1B are inserted. The plurality of through holes 12 are soldered in a state where the terminals 2 of the first current auxiliary member 1A and the second current auxiliary member 1B are inserted, thereby conducting the conductive portion 11 of the printed circuit board 10 (see FIG. 5). And terminal 2 are connected. In FIG. 7, the conductive portion 11 is not shown for easy viewing.

  The terminal 2 has a base end portion 21, a first convex portion 22, and a second convex portion 23. The proximal end portion 21 is connected to the conductive connection portion 3. The first convex portion 22 is connected to the proximal end portion 21. The first convex portion 22 has a smaller cross-sectional area than the base end portion 21. The second convex portion 23 is connected to the first convex portion 22. The second convex portion 23 has a smaller cross-sectional area than the first convex portion 22. Here, the cross-sectional area is a cross-sectional area in the direction along the current direction A. The terminal 2 has a staircase shape in which the tip side is thinned in two steps. The height D2 of the first convex portion 22 is larger than the plate thickness t of the current auxiliary member 1.

  The diameter of the through hole 12 into which the terminal 2 of the first current auxiliary member 1A is inserted is different from the diameter of the through hole 12 into which the terminal 2 of the second current auxiliary member 1B is inserted. . That is, the diameter of the through hole 12 into which the first current assisting member 1A is inserted has such a size that the first convex portion 22 cannot be inserted and the second convex portion 23 can be inserted. On the other hand, the diameter of the through hole 12 into which the second current auxiliary member 1B is inserted has a size that allows the first convex portion 22 to be inserted. Thereby, a clearance gap can be provided between the electroconductive connection part 3 of 1 A of 1st electric current auxiliary members, and the electroconductive connection part 3 of the 2nd electric current auxiliary member 1B. For this reason, air flows between the first current auxiliary member 1A and the second current auxiliary portion 1B through this gap. Thereby, the heat dissipation effect can be enhanced.

  In addition, the electroconductive connection part 3 of 1 A of 1st electric current auxiliary members and the electroconductive connection part 3 of the 2nd electric current auxiliary member 1B may be arrange | positioned in parallel. The length from the upper end to the lower end of the first and second current auxiliary members 1A, 1B (from the upper surface of the conductive connection portion 3 to the lower surface of the terminal 2) is, for example, 8 mm. The terminal 2 of the first current auxiliary member 1A protrudes from the lower surface of the printed circuit board 10 with a dimension of, for example, 1 mm or more and 2 mm or less. Further, the terminal 2 of the second current auxiliary member 1B protrudes from the lower surface of the printed circuit board 10 with a dimension of 3 mm or more and 4 mm or less, for example. On the other hand, the thickness of the printed circuit board 10 is, for example, not less than 1 mm and not more than 2 mm.

  In addition, referring to FIG. 8, terminal 2 may have a shape that narrows toward the tip. In the first modification of the embodiment of the present invention, the terminal 2 has a base end portion 21 and a taper portion 24. The proximal end portion 21 is connected to the conductive connection portion 3. The tapered portion 24 is connected to the proximal end portion 21. The taper portion 24 is formed so that the cross-sectional area becomes smaller than the base end portion 21 toward the tip. Specifically, the terminal 2 has a trapezoidal shape in which the tip end side is narrowed. Similarly to the above, the diameter of the through hole 12 into which the terminal 2 is inserted is different between the first current auxiliary member 1A and the second current auxiliary member 1B.

  Here, the diameter SA of the through hole 12 into which the terminal 2 of the first current auxiliary member 1A is inserted, the diameter SB of the through hole 12 into which the terminal 2 of the second current auxiliary member 1B is inserted, the current auxiliary member 1 The plate thickness t, the angle θ of the inclined surface of the tapered portion 24 of the terminal 2, the distance HA from the point where the center line of the terminal 2 of the first current auxiliary member 1A intersects the line along the inclined surface to the upper surface of the printed circuit board 10, the first When the distance HB from the point where the center line of the terminal 2 of the current assisting member 1B and the line along the slope intersect with the upper surface of the printed circuit board 10 is tan θ = SA / 2 / HA, tan θ = SB / 2 / HB. It becomes.

  In order to provide an interval in the height direction between the first current auxiliary member 1A and the second current auxiliary member 1B, it is necessary to satisfy HA−HB> t. Therefore, the diameters SA and SB of the through hole 12 are set so that tan θ <(SA−SB) / (2 × t). Thereby, a clearance gap can be provided between the electroconductive connection part 3 of 1 A of 1st electric current auxiliary members, and the electroconductive connection part 3 of the 2nd electric current auxiliary member 1B. For this reason, air flows between the first current auxiliary member 1A and the second current auxiliary portion 1B through this gap. Thereby, the heat dissipation effect can be enhanced.

  In the above, the case where the number of the terminals 2 is four has been described, but it may be four or more, for example, eight. Referring to FIG. 9, in the second modification of the embodiment of the present invention, each of the first current auxiliary member 1 </ b> A and the second current auxiliary member 1 </ b> B has eight terminals 2. In the second modification of the embodiment of the present invention, similarly to the above, one terminal 2 of the first current auxiliary member 1A is interposed between one terminal 2 of the second current auxiliary member 1B and the heat radiating portion 4. Has been inserted. In addition, another terminal 2 of the first current auxiliary member 1A is connected to one terminal 2 of the second current auxiliary member 1B and one terminal along the side of the conductive connection part 3 provided with the heat radiating part 4. It is inserted between another terminal 2 provided outside. The other terminals 2 of the first and second current auxiliary members 1A and 1B are arranged so as to be shifted from each other in plan view.

  Next, the configuration of the printed circuit board 10 on which the current auxiliary member 1 according to the embodiment of the present invention is mounted will be described with reference to FIG. A plurality of current auxiliary members 1 </ b> A and 1 </ b> B are connected to the conductive portion 11 provided on the surface of the printed circuit board 10. A heat sink 61 and an electronic component 63 are connected to the surface of the printed circuit board 10. The heat sink 61 has a plurality of heat radiation fins 62. The electronic component 63 is a power module or the like, and generates heat when used.

  Next, the positional relationship between the plurality of current auxiliary members 1A and 1B and the heat sink 61 will be described with reference to FIGS. Since the electronic component 63 such as a power module generates heat, it may be radiated by the heat sink 61. In one embodiment of the present invention, a heat sink 61 is attached to the electronic component 63. Then, cooling air may flow on the printed circuit board 10 so as to cool the electronic component 63 by blowing air to the heat radiating fins 62 of the heat sink 61.

  In the first current auxiliary member 1 </ b> A and the second current auxiliary member 1 </ b> B, the heat radiating portions 4 are arranged in parallel with the heat radiating fins 62 of the heat sink 61 in a plan view. A linear wind flows through the heat radiating fins 62 in parallel with the heat radiating fins 62. Since the heat radiating part 4 is arranged in parallel with the heat radiating fins 62, the high wind speed flowing through the heat radiating fins 62 flows through the heat radiating parts 4 of the first current auxiliary member 1A and the second current auxiliary member 1B. For this reason, the heat dissipation effect can be enhanced.

  In addition, when the thermal radiation part 4 is long, there exists a possibility that a wind speed may fall on the leeward side of the thermal radiation part 4, and the thermal radiation effect may fall. That is, in general, the wind flowing between the plates has different wind speed distributions in the vicinity of the plate and at a position away from the leeward side of the plate. On the leeward side of the plate, the wind speed distribution is uniform between the vicinity of the plate and a position away from the plate, whereas on the leeward side of the plate, the wind speed near the plate is slow and the wind speed at a position away from the plate is high. The longer the plate, the greater the difference in wind speed between the vicinity of the plate and the distant position, and the heat dissipation effect near the plate having a slower wind speed is reduced. For this reason, when the thermal radiation part 4 is long, there exists a possibility that the thermal radiation effect may fall in the leeward side of the thermal radiation part 4. FIG.

  However, in the first and second current auxiliary members 1A and 1B of the embodiment of the present invention, the first and second current auxiliary members 1A and 1B on the windward side and the first and second on the leeward side. Since there is an interval between the current auxiliary members 1A and 1B, the wind speed is made uniform at this interval. Therefore, a decrease in wind speed in the vicinity of the heat radiating portion 4 of the first and second current auxiliary members 1A and 1B on the leeward side is suppressed. Therefore, the heat dissipation effect does not deteriorate even with the first and second current auxiliary members 1A and 1B on the leeward side.

Next, the function and effect of the embodiment of the present invention will be described.
According to the current auxiliary member 1 of one embodiment of the present invention, the electrical resistance can be reduced by increasing the cross-sectional area through which the current flows through the conductive connection portion 3. For this reason, a large current can flow. Moreover, heat dissipation can be improved by dissipating heat by the heat dissipating part 4. When a current flows through the conductive connection part 3, the terminal 2, and the conductive part 11 of the printed circuit board 10, heat is generated. In addition to being radiated from the respective surfaces to the surrounding air, this heat is transmitted to the radiating portion 4 and radiated from the radiating portion 4 to the ambient air. The heat dissipation part 4 increases the heat dissipation effect and suppresses the temperature increase of the current auxiliary member 1 and the conductive part 11 of the printed circuit board 10. For this reason, a larger current can flow. As described above, a large current of 50 A, for example, can be applied by reducing the electrical resistance by the conductive connection portion 3 and improving the heat dissipation property by the heat dissipation portion 4.

  Furthermore, the electric resistance of the current auxiliary member 1 decreases as the cross-sectional area of the current auxiliary member 1 increases, and a larger current can flow. However, the larger the cross-sectional area, the more difficult the processing of the current auxiliary member 1 becomes. Moreover, it becomes difficult to solder to the conductive part 11 of the printed circuit board 10. Therefore, in one embodiment of the present invention, the cross-sectional area of each terminal can be reduced by using four or more terminals 2 to improve workability and solderability.

  In addition, since the conductive connection portion 3 includes a plurality of concave portions 5 having dimensions larger than the width of each of the four or more terminals, the conductive connection portion 3 includes the concave portions 5 of the conductive connection portion 3 of the first current auxiliary member 1A. By arranging the terminal 2 of the conductive connection portion 3 of the other current auxiliary member 1B, the first and second current auxiliary members 1A and 1B can be arranged to overlap each other. By arranging the first and second current auxiliary members 1 </ b> A and 1 </ b> B in an overlapping manner, the total cross-sectional area of the conductive connection portion 3 can be increased. Thereby, electrical resistance can be reduced. On the other hand, by arranging the first and second current auxiliary members 1A and 1B in an overlapping manner, the cross-sectional area of each terminal of the first and second current auxiliary members 1A and 1B can be further reduced, and the workability and solderability can be reduced. Can be improved. Moreover, heat dissipation can be improved by providing the two thermal radiation parts 4. FIG.

Further, by arranging the first and second current auxiliary members 1A and 1B so as to overlap each other, the current flowing through the terminals 2 of the first and second current auxiliary members 1A and 1B is dispersed. That is, the current flowing through each of the first and second current auxiliary members 1A and 1B is half of the current when there is one current auxiliary member 1. The relationship between the resistance Rj of the terminal 2, the flowing current I, and the heat generation P of the terminal 2 is expressed as P = I ² × Rj. When the current I is halved, P = (1/4) × I ² × Rj. The heat generation P can be reduced to ¼. Thereby, the local heat_generation | fever of the terminal 2 can be suppressed.

  Moreover, if it is going to implement | achieve a large current with the one current auxiliary member 1, the current auxiliary member 1 may enlarge and cost increase. That is, the printed circuit board 10 includes a portion where a current of 100 A or more flows, and a portion where only a current of about 50 A flows. For this reason, in the location below the allowable current of the current auxiliary member 1, the current auxiliary member 1 is increased in size and cost more than necessary. If many types of current auxiliary members 1 are manufactured according to the current value, the current auxiliary member 1 cannot be standardized, and the initial cost of manufacturing the current auxiliary member becomes high.

  Therefore, the degree of freedom in design can be improved by forming the first and second current auxiliary members 1A and 1B in a shape that can be placed on top of each other. In other words, a single current auxiliary member 1 is used at a location where the current value is small, and two current auxiliary members 1 are overlapped at a location where the current value is large, thereby realizing a use form that matches the current value. can do. Moreover, since the electric current auxiliary member 1 can be made into the same shape, the electric current auxiliary member 1 can be standardized and the initial cost of manufacture can be reduced.

  Further, when the heat radiating part 4 is arranged at a position close to the terminal 2, the heat applied to the heat radiating part 4 during soldering spreads to the heat radiating part 4, the temperature rise of the terminal 2 is suppressed, and the terminal 2 is soldered. Defects can occur. However, the concave portion 5 can suppress the heat applied to the terminal 2 during soldering from spreading to the heat radiating portion 4. In addition, although heat is suppressed from spreading to the heat radiating part 4 during instantaneous heating during soldering, in the case of steady heat generation during current application, heat is sufficiently spread to the heat radiating part 4 so that the heat radiating effect is effective. There is no reduction.

  According to the current auxiliary member 1 of one embodiment of the present invention, the terminal 2 includes a base end portion 21, a first convex portion 22 having a smaller cross-sectional area than the base end portion 21, and a first convex portion. And a second protrusion 23 having a cross-sectional area smaller than 22. For this reason, the first and second current auxiliary members 1A and 1B are inserted in the through hole 12 by changing the sizes of the through holes 12 into which the first and second current auxiliary members 1A and 1B are inserted. A gap in the height direction can be provided between 1B. Thereby, the heat dissipation effect of 1st and 2nd electric current auxiliary member 1A, 1B can be heightened.

  According to the current auxiliary member 1 of one embodiment of the present invention, the terminal 2 includes a base end portion 21 and a tapered portion 24 formed so that the cross-sectional area becomes smaller than the base end portion 21 toward the tip end. have. For this reason, the first and second current auxiliary members 1A and 1B are inserted in the through hole 12 by changing the sizes of the through holes 12 into which the first and second current auxiliary members 1A and 1B are inserted. A gap in the height direction can be provided between 1B. Thereby, the heat dissipation effect of 1st and 2nd electric current auxiliary member 1A, 1B can be heightened.

  According to the printed circuit board 10 of one embodiment of the present invention, a plurality of the current assisting members 1 are provided. Therefore, it is possible to realize the printed circuit board 10 including the current auxiliary member that can supply a large current by reducing the electrical resistance and improving the heat dissipation and can improve the workability and the solderability.

  In addition, the first and second current auxiliary members 1A and 1B among the plurality of current auxiliary members 1 are arranged so that the heat radiating portions 4 face each other with the conductive connection portions 3 interposed therebetween. . Any one of the four or more terminals 2 of the second current auxiliary member 1B is disposed in any one of the plurality of recesses 5 of the first current auxiliary member 1A. Thereby, the printed circuit board 10 which has arrange | positioned the 1st and 2nd electric current auxiliary members 1A and 1B on each other is realizable.

  For this reason, the total cross-sectional area of the conductive connection portion 3 can be increased to reduce the electrical resistance. On the other hand, the cross-sectional area for each terminal of the first and second current auxiliary members 1A and 1B can be further reduced to improve the workability and solderability. Moreover, the heat dissipation can be improved by the two heat dissipating parts 4. Further, the current flowing through the terminal 2 can be dispersed to suppress local heat generation at the terminal 2. Furthermore, the degree of freedom in design can be improved by forming the first and second current auxiliary members 1A and 1B in a shape that can be placed on top of each other.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  DESCRIPTION OF SYMBOLS 1 Current auxiliary member, 1A 1st current auxiliary member, 1B 2nd current auxiliary part, 2 terminal, 3 Conductive connection part, 4 Heat radiation part, 5 Concave part, 10 Printed circuit board, 11 Conductive part, 12 Through hole, 21 Base end part, 22 1st convex part, 23 2nd convex part, 24 taper part, 61 heat sink, 62 heat radiation fin, 63 electronic component.

Claims (4)

A current auxiliary member for connecting to a conductive portion provided on the surface of the printed circuit board,
Four or more terminals for connection to the conductive portion;
A conductive connection portion arranged to face the surface of the printed circuit board and electrically connecting each of the four or more terminals;
A heat radiating portion extending from the conductive connection portion to the side opposite to the printed circuit board side;
The conductive auxiliary member is a current auxiliary member including a plurality of recesses having dimensions larger than the width of each of the four or more terminals. The terminal is
A proximal end connected to the conductive connection;
A first convex portion connected to the base end portion and having a smaller cross-sectional area than the base end portion;
The current auxiliary member according to claim 1, further comprising: a second convex portion connected to the first convex portion and having a smaller cross-sectional area than the first convex portion. The terminal is
A proximal end connected to the conductive connection;
The current auxiliary member according to claim 1, further comprising: a taper portion connected to the base end portion and formed to have a cross-sectional area smaller than the base end portion toward the tip end. A plurality of the current auxiliary members according to any one of claims 1 to 3, and the conductive portion to which the plurality of current auxiliary members are connected,
The first and second current auxiliary members of the plurality of current auxiliary members include the conductive connection portion of the first current auxiliary member and the conductive connection portion of the second current auxiliary member. The heat dissipating part of the first current auxiliary member and the heat dissipating part of the second current auxiliary member are arranged so as to face each other,
The printed circuit board, wherein any of the four or more terminals of the second current auxiliary member is disposed in any of the plurality of recesses of the first current auxiliary member.

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