JP4858198B2 - Terminal block and circuit board provided with the same - Google Patents

Description

  The present invention relates to a terminal block and a circuit board including the terminal block.

  A terminal block is known as an interface for electrically connecting a circuit pattern portion formed on a substrate and other electrical components. The terminal block is used by being mounted on a substrate, and terminals of electrical components are fixed to the terminal block. The terminal block is usually mounted by soldering on a substrate.

As such a terminal block, a power module terminal block that electrically connects a circuit pattern portion of a substrate and a terminal of a power module is known (see Patent Document 1). In Patent Document 1, it is proposed to provide a plurality of flexible pin portions on a flat pedestal portion, thereby relieving stress at the connection portion between the circuit pattern portion of the substrate and each pin portion and improving vibration resistance. Has been.
Japanese Utility Model Publication No. 5-6705

  However, in the said patent document 1, the terminal of a power module is screw-fixed through the said terminal block. For this reason, a load due to rotational torque acting on the terminal block during screw tightening is applied to the solder that is a connection portion between the substrate and each pin portion, and stress may remain in the solder. In this case, when the power module and the substrate are used in an environment where the temperature change is severe, such as an automobile, cracks may occur in the solder during repeated thermal shocks.

  In particular, in Patent Document 1, since the pattern portion and each pin portion in the circuit board are in contact with each other via solder, the cracks are generated in the solder, and eventually the electrical connection is impaired and the function is reduced. There was a problem of stopping. Therefore, the terminal block of Patent Document 1 still has room for improvement in terms of long-term reliability.

  This invention is made | formed in view of the said situation, and makes it a subject to provide a terminal block which can fully improve long-term reliability, and a circuit board provided with the same.

  In order to solve the above problems, the present invention provides a pedestal having a terminal mounting surface to which a terminal is mounted, at least three first lead legs provided on the pedestal, and second lead legs provided on the pedestal. The distal end portion of the first lead foot and the distal end portion of the second lead foot are disposed on the opposite side of the terminal mounting surface with respect to the pedestal portion, and the distal end portion of the second lead foot is A terminal block surrounded by the tip portions of the at least three first lead legs.

  According to the terminal block of the present invention, the following effects are exhibited. That is, first, the second lead foot is fixed and connected to the circuit pattern portion formed on the circuit board in the circuit board to ensure conduction, and the first lead foot is fixed to the circuit board to separate the pedestal portion from the substrate. In this state, the terminal block is mounted on the substrate. The distal ends of the first lead foot and the second lead foot and the substrate are fixed with solder or the like. According to the terminal block of the present invention, in this state, even if a rotational torque is applied to the pedestal portion as the terminal is attached to the terminal mounting surface of the pedestal portion of the terminal block, the distal end portion of the second lead foot is applied. It is possible to make the rotational torque smaller than the rotational torque applied to the tip portion of the first lead foot. For this reason, the stress applied to the solder or the like for fixing the second lead foot and the substrate can be made smaller than the stress applied to the solder or the like for fixing the first lead foot and the substrate. Residue can be sufficiently suppressed.

  In the terminal block, the second lead leg has a connecting portion that connects the tip portion and the pedestal portion, and the connecting portion is bent with respect to the tip portion and extends from the tip portion to the terminal mounting surface. It is preferable that it extends toward the outer side. According to the terminal block having such a configuration, when the rotational torque is applied to the pedestal portion, the rotational torque that cannot be absorbed by the first lead foot is absorbed by the bent portion, and the tip portion of the second lead foot is absorbed. The stress applied to is further reduced. For this reason, it is possible to further reduce the stress applied to the solder or the like connecting the second lead leg and the substrate.

  In the terminal block, it is preferable that the tip portion of the first lead leg has a curved portion. In this case, when the substrate and the tip of the first lead foot are fixed with solder or the like, the contact area between the tip of the first lead foot and the solder or the like has a curved portion at the tip of the first lead foot. Increase compared to when not. For this reason, even if rotational torque is applied to the first lead foot, the stability is further improved as compared to the case where the tip portion of the first lead foot does not have a curved portion.

  Here, it is preferable that the curved portion bends outward with respect to the region surrounded by the tip portion of the first lead foot. In this case, when the distal end portion of the first lead foot is inserted into the substrate insertion hole formed in the substrate, the curved portion at the distal end portion of the first lead foot is the substrate on the outer hole wall surface from the center of the rotational torque in the substrate insertion hole. Therefore, even if a load due to rotational torque is applied to the first lead foot, the load is firmly fixed to the substrate against the load.

  Further, the present invention is a circuit board comprising a substrate, a circuit pattern portion provided on the substrate, and a terminal block provided on the substrate and electrically connected to the circuit pattern portion, wherein the terminal A base is disposed apart from the substrate and has a base part having a terminal attachment surface to which a terminal is attached, at least three first lead legs provided on the base part, and a second provided on the base part. A lead leg, and a tip part of the first lead leg and a tip part of the second lead leg are arranged on the substrate side opposite to the terminal mounting surface with respect to the pedestal part, and the second lead The distal end portion of the foot is surrounded by the distal end portions of the at least three first lead feet, the distal end portion of the first lead foot and the substrate are fixed by the first fixing portion, and the second lead foot The tip and the substrate Is fixed by the second fixing portion, the second lead leg is a circuit board connected to the circuit pattern section.

  According to the circuit board of the present invention, even if a rotational torque is applied to the pedestal portion as the terminal is attached to the terminal mounting surface of the pedestal portion of the terminal block, the rotational torque applied to the tip portion of the second lead foot is reduced. The rotational torque applied to the tip portion of the first lead leg can be made smaller. For this reason, it becomes possible to make the stress given to a 2nd fixing | fixed part smaller than the stress given to a 1st fixing | fixed part, and the residual of a stress can fully be suppressed in a 2nd fixing | fixed part. Therefore, according to the circuit board of the present invention, it is possible to sufficiently prevent the occurrence of cracks in the second fixing portion even when used in an environment where the temperature change is severe.

  In the circuit board, the second lead leg has a connecting portion that connects the tip portion and the pedestal portion, and the connecting portion is bent with respect to the tip portion and extends from the tip portion to the outside of the terminal mounting surface. It is preferable that it extends toward. In this case, since the stress applied to the tip portion of the second lead foot is further reduced, the stress applied to the solder or the like that fixes the second lead foot and the substrate can be made sufficiently smaller.

  In the above circuit board, it is preferable that the distal end portion of the first lead leg has a curved portion, and the distal end portion is inserted into a substrate insertion hole formed in the substrate.

  In this case, the contact area between the distal end portion of the first lead foot and the first fixing portion is increased as compared with the case where the distal end portion of the first lead foot does not have a curved portion. For this reason, even if rotational torque is applied to the first lead foot, the stability is further improved as compared to the case where the tip portion of the first lead foot does not have a curved portion.

  In the circuit board, it is preferable that the curved portion bends outward with respect to a region surrounded by the tip portions of the at least three first lead legs.

  In this case, even when a load due to rotational torque is applied to the first lead foot, the curved portion at the tip of the first lead foot is brought into contact with the substrate at the hole wall surface on the outer side from the rotational torque center in the substrate insertion hole. Even if a load due to rotational torque is applied to the first lead foot, the load is firmly fixed to the substrate against the load.

  According to the terminal block and the circuit board of the present invention, a terminal block capable of sufficiently improving long-term reliability and a circuit board including the terminal block are provided.

  Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 1 is a plan view showing a preferred embodiment of a circuit board according to the present invention, FIG. 2 is an exploded perspective view showing the circuit board of FIG. 1, and FIG. 3 is a perspective view showing the terminal block of FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 1, FIG. 5 is a cross-sectional view taken along line V-V in FIG. 1, and FIG. 6 is a bottom view showing the terminal block in FIG.

  As shown in FIG. 1, a circuit board 100 according to the present embodiment is mounted on a substrate 1, a circuit pattern portion 2 formed on one main surface 1 a of the substrate 1, and a main surface 1 a of the substrate 1, And a conductive terminal block 3 electrically connected to the circuit pattern portion 2.

  As shown in FIG. 2, the terminal block 3 is for attaching a terminal 4 of an electrical product and electrically connecting the circuit pattern portion 2 formed on the substrate 1 to the terminal 4. The terminal 4 has a through hole 4 a for inserting the fixing screw 9, and the terminal block 3 also has a tap portion 11 for inserting the fixing screw 9. Accordingly, by engaging the fixing screw 9 with the through hole 4 a of the terminal 4 and the tap portion 11 of the terminal block 3, the terminal 4 is connected and fixed to the substrate 1 via the terminal block 3. . In FIG. 2, the terminals 4 and the fixing screws 9 do not constitute the circuit board 100.

  As shown in FIG. 3, the terminal block 3 includes a pedestal portion 5 having a terminal mounting surface 6 to which the terminals 4 are mounted, and four fixings extending on the opposite side of the pedestal portion 5 from the terminal mounting surface 6. A lead leg (first lead leg) 7 for connection and two connecting lead legs (second lead legs) 8 extending to the side opposite to the terminal mounting surface 6 of the base part 5 with respect to the base part 5 are provided.

  Specifically, as shown in FIG. 4, the pedestal 5 is provided on both sides of the flat pedestal main body 5 a having the terminal mounting surface 6 and the pedestal main body 5 a and extends to the opposite side of the terminal mounting surface 6. And a bent portion 5b. Accordingly, the bent portions 5b provided on both sides of the pedestal main body 5a are arranged to face each other.

  As shown in FIG. 4, the pedestal main body 5a is formed with a screw insertion port 10 at the center thereof. The pedestal main body 5a extends from the periphery of the screw insertion port 10 toward the substrate 1 and is fixed. A cylindrical tap portion 11 for fixing the screw 9 extends. Here, the screw insertion port 10 has an inner diameter larger than the inner wall surface 11 a of the tap portion 11, and a tapered surface 11 b is provided between the inner wall surface 11 a of the tap portion 11 and the inner wall surface 10 a of the screw insertion port 10. Is provided. For this reason, the fixing screw 9 can be easily inserted into the tap part 11 through the screw insertion port 10.

  Further, as shown in FIG. 1, the base body 5 a is provided with a plurality of restricting pieces 12 that restrict the movement of the terminal 4 and prevent the terminal 4 from coming off from the terminal base 3. The plurality of restricting pieces 12 are provided on the periphery of the terminal mounting surface 6 so as to surround the screw insertion opening 10. In the present embodiment, there are four restricting pieces 12, and these protrude from the pedestal body 5 a toward the opposite side of the substrate 1.

  Further, as shown in FIG. 3, two fixing lead legs 7 extend toward the board 1 on the side opposite to the terminal mounting surface 6 from the tip of each bent portion 5 b. More specifically, the four fixing lead legs 7 extend in the same direction from the terminal mounting surface 6 and are disposed so as to surround the screw insertion slot 10 (see FIG. 1).

  Further, as shown in FIG. 3, from each bent portion 5 b, one connection lead foot 8 is provided between the two fixing lead feet 7 toward the board 1 on the side opposite to the terminal mounting surface 6. It extends.

  That is, the base portion of the connecting lead foot 8 is arranged at a position not surrounded by the four fixing lead feet 7. Specifically, the base portion of the connecting lead foot 8 is disposed on a line connecting the four fixing lead feet 7 together.

  The connecting lead foot 8 is composed of a tip portion 8a inserted into the fixing through hole 13a of the substrate 1, and a connecting portion 8b for connecting the tip portion 8a and the bent portion 5b of the pedestal portion 5; The fixing lead foot 7 includes a tip 8 a inserted into the fixing through hole 13 b of the substrate 1 and a connecting portion 8 b that connects the tip 8 a and the bent portion 5 b of the base 5.

  On the other hand, as shown in FIG. 2, the substrate 1 has four fixing through holes (substrate insertion holes) 13 a into which the distal end portions 7 a of the fixing lead feet 7 are inserted, and the distal end portions 8 a of the connecting lead feet 8. And two connecting through holes 13b. Four fixing through-holes 13a are formed around a portion of the substrate 1 facing the tap portion 11, and two connecting through-holes 13b are around the portion of the substrate 1 facing the tap portion 11 It is formed inside a rectangular region surrounded by the four fixing through holes 13a. The circuit pattern portion 2 is not connected to the four fixing through holes 13a, and the circuit pattern portion 2 is connected to the two connecting through holes 13b.

  Then, as shown in FIG. 4, the connecting lead leg 8 is inserted into the connecting through hole 13 b, and the connecting lead leg 8 is fixed in the connecting through hole 13 b by solder 17. Here, the connection lead foot 8 and the circuit pattern portion 2 are electrically connected via the solder 17. As shown in FIG. 5, the fixing lead foot 7 is inserted into the fixing through hole 13a, and the fixing lead foot 7 and the circuit pattern portion 2 are not connected to each other.

  Further, as shown in FIG. 6, the distal end portion 8 a of the connecting lead foot 8 is surrounded by the distal end portions 7 a of the four fixing lead feet 7. In other words, the distal end portion 8 a of the connecting lead foot 8 is disposed inside the region A connecting the distal end portions 7 a of the four fixing lead feet 7. In other words, the distal end portion 8 a of the connecting lead foot 8 is disposed at a position closer to the central axis 14 passing through the screw insertion slot 10 than the distal end portion 7 a of the fixing lead foot 7.

  According to the circuit board 100 having the above configuration, the following effects are exhibited.

  That is, first, the terminal 4 is attached to the terminal attachment surface 6 in the pedestal portion 5 of the terminal base 3. At this time, the terminal 4 is placed on the terminal mounting surface 6, and the fixing screw 9 is inserted into the through hole 4 a of the terminal 4 and the screw insertion port 10 of the terminal block 3 and fixed to the tap portion 11. At this time, rotational torque is applied to the pedestal portion 5 as the fixing screw 9 rotates.

  At this time, as described above, the distal end portion 8 a of the connecting lead foot 8 is surrounded by the distal end portions 7 a of the four fixing lead feet 7. In other words, the distal end portion 8 a of the connecting lead foot 8 is disposed at a position closer to the central axis line 14 passing through the screw insertion slot 10 than the distal end portion 7 a of the fixing lead foot 7.

  Therefore, according to the circuit board 100, the rotational torque applied to the distal end portion 8 a of the connecting lead foot 8 can be made smaller than the rotational torque applied to the distal end portion 7 a of the fixing lead foot 7. Therefore, the stress applied to the solder 17 connecting the connecting lead foot 8 and the substrate 1 can be made smaller than the stress applied to the solder 16 connecting the fixing lead foot 7 and the substrate 1. 17, the residual stress can be sufficiently suppressed. In other words, since the tip portions 7a of the four fixing lead feet 7 receive the load generated by tightening the fixing screws 9, the burden on the tip portions 8a of the two connecting lead feet 8 is reduced. be able to. Furthermore, in other words, it is possible to prevent the two connecting leads 8 from being properly subjected to rotational stress during screw tightening.

  Therefore, according to the circuit board 100, the residual stress due to the rotational torque is reduced, so that it is possible to sufficiently prevent the occurrence of cracks in the solder 17 even when the circuit board 100 is used in an environment where the temperature changes rapidly. Therefore, even when the circuit board 100 is used in an environment where the temperature change is particularly severe such as in an automobile, it is possible to sufficiently prevent the occurrence of cracks due to repeated thermal shocks in the solder 17. Therefore, according to the circuit board 100, long-term reliability can be improved.

  In the circuit board 100, the connecting lead leg 8 has a connecting portion 8b that connects the tip portion 8a and the pedestal portion 5, and the connecting portion 8b is bent with respect to the tip portion 8a. And the connection part 8b is extended so that it may go to the outer side of the terminal attachment surface 6 from the front-end | tip part 8a. That is, the connecting lead leg 8 is kinked toward the central axis 14 passing through the screw insertion slot 10. Then, the distal end portion 8 a of the connecting lead leg 8 is inserted into the connecting through hole 13 b of the substrate 1. For this reason, it is possible to relieve the load caused by the rotational torque that could not be absorbed by the fixing lead foot 7 by the connecting lead foot 8. For this reason, the solder 17 that connects the connecting lead legs 8 and the substrate 1 is further less likely to be stressed.

  Further, as shown in FIG. 5, in the circuit board 100, the distal end portion 7a of the fixing lead foot 7 has a curved portion 18, and the distal end portion 7a is inserted into the fixing through hole 13a.

  In this case, the contact area between the distal end portion 7 a of the fixing lead foot 7 and the solder 16 is increased as compared with the case where the distal end portion 7 a of the fixing lead foot 7 does not have the curved portion 18. For this reason, even if a rotational torque is applied to the fixing lead foot 7, the stability is further improved as compared with the case where the distal end portion 7 a of the fixing lead foot 7 does not have the curved portion 18.

  Here, the bending portion 18 is bent outward with respect to the rectangular region A surrounded by the tip portions 7 a of the four fixing lead legs 7.

  In this case, even if a load due to rotational torque is applied to the fixing lead foot 7, the curved portion 18 at the distal end portion 7 a of the fixing lead foot 7 has a hole outside the center of the rotational torque in the inner wall surface of the fixing through hole 13 a. Even if a load due to rotational torque is applied to the fixing lead foot 7 in contact with the wall surface, the load is firmly fixed to the substrate 1 against the load.

  The present invention is not limited to the above embodiment. For example, in the above embodiment, the number of fixing lead legs 7 is four, but it is sufficient that there are at least three. Accordingly, the number of fixing lead legs 7 may be three, or five or more. Further, in the above embodiment, it is sufficient that at least the connection lead foot 8 is connected to the circuit pattern portion 2, and thus the fixing lead foot 7 is not connected to the circuit pattern portion 2. In addition to the connecting lead legs 8, the fixing lead legs 7 may be connected to the circuit pattern portion 2.

  In the above embodiment, the terminal block 3 has the two connecting lead legs 8, but the connecting lead leg 8 may be one.

  Further, in the above-described embodiment, the two tip portions 8a of the connecting lead feet 8 are arranged inside the rectangular area A surrounded by the tip portions 7a of the four fixing lead feet 7. The connection lead foot 8 is used in such a way that even if the electrical connection cannot be secured for one, the electrical connection can be secured for the other, and the whole is made symmetrical. This is because the assembly efficiency in manufacturing can be improved. In the present invention, it is only necessary that the tip 8a of at least one connecting lead leg 8 is disposed inside the rectangular region A.

  Moreover, in the said embodiment, although the base part 5 has the bending part 5b on both sides of the base body 5a, the bending part 5b reinforces the fixing lead leg 7 and the connecting lead leg 8. It is not necessary to provide it. In this case, the fixing lead foot 7 and the connecting lead foot 8 are directly provided on the base body 5a.

  Further, in the above embodiment, the root portion of the connecting lead foot 8 is arranged at a position not surrounded by the four fixing lead feet 7, but the root portion of the connecting lead foot 8 is four. It may be arranged at a position surrounded by the fixing lead legs 7.

It is a fragmentary top view which shows suitable embodiment of the circuit board based on this invention. It is a disassembled perspective view which shows the circuit board of FIG. It is a perspective view which shows the terminal block of FIG. It is sectional drawing along the IV-IV line of FIG. It is sectional drawing along the VV line of FIG. It is a bottom view which shows the terminal block of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Board | substrate, 2 ... Circuit pattern part, 3 ... Terminal block, 4 ... Terminal, 5 ... Base part, 6 ... Terminal mounting surface, 7 ... Fixed lead foot (1st lead foot), 7a ... Fixed lead foot Tip part, 7b ... connecting part, 8 ... connecting lead leg (second lead leg), 8a ... tip part of connecting lead leg, 8b ... connecting part, 13a ... fixing through hole (substrate insertion hole), 16 ... Solder (first fixing portion), 17 ... solder (second fixing portion), 18 ... curved portion, 100 ... circuit board.

Claims (6)

A pedestal having a terminal mounting surface to which the terminal is mounted;
At least three first lead legs provided on the pedestal portion;
A second lead foot provided on the pedestal portion,
The distal end portion of the first lead foot and the distal end portion of the second lead foot are disposed on the opposite side of the terminal mounting surface with respect to the pedestal portion,
The tip portion of the second lead foot is surrounded by the tip portions of the at least three first lead feet ,
The second lead leg has a connecting portion that connects the tip portion and the pedestal portion, and the connecting portion is bent with respect to the tip portion and extends from the tip portion toward the outside of the terminal mounting surface. Extending terminal block. The terminal block according to claim 1 , wherein the tip portion of the first lead leg has a curved portion. The terminal block according to claim 2 , wherein the curved portion is curved outward with respect to a region surrounded by the tip portion of the first lead foot. A circuit board comprising: a substrate; a circuit pattern portion provided on the substrate; and a terminal block provided on the substrate and electrically connected to the circuit pattern portion;
The terminal block is
A pedestal having a terminal mounting surface on which a terminal is mounted while being spaced apart from the substrate;
At least three first lead legs provided on the pedestal portion;
A second lead foot provided on the pedestal portion,
The distal end portion of the first lead foot and the distal end portion of the second lead foot are disposed on the substrate side opposite to the terminal mounting surface with respect to the pedestal portion,
The tip portion of the second lead foot is surrounded by the tip portions of the at least three first lead feet,
The second lead leg has a connecting portion that connects the tip portion and the pedestal portion, and the connecting portion is bent with respect to the tip portion and extends from the tip portion toward the outside of the terminal mounting surface. Extended,
The tip portion of the first lead foot and the substrate are fixed by a first fixing portion,
The tip portion of the second lead foot and the substrate are fixed by a second fixing portion,
The circuit board, wherein the second lead leg is connected to the circuit pattern portion. The circuit board according to claim 4 , wherein the distal end portion of the first lead leg has a curved portion, and the distal end portion is inserted into a substrate insertion hole formed in the substrate. The circuit board according to claim 5 , wherein the curved portion is curved outward with respect to a region surrounded by the tip portion of the first lead foot.

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