JP2005353906A - Terminal connecting method, terminal connecting structure, and electronic circuit board - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a terminal connecting method whereby terminals can be connected with each other surely and firmly, to provide a connectively highly reliable terminal connecting structure connected by this method, and further, to provide an electronic circuit board having this terminal connecting structure. <P>SOLUTION: A bus bar is provided as a wiring in the inside of the main body 101 of a circuit board, and an external connection terminal 103a is formed by folding a portion of the bus bar in a nearly L-shaped way. The portion of the external connection terminal 103a which is made upright from the surface of the circuit board is in the state of it being inserted into a terminal slot 104, and this upright portion is slightly inclined toward the side of a lead terminal 102a in the state of it receiving no external force, i.e., in the state of the lead terminal 102a being not inserted into the terminal slot 104. Further, notches 103b are so formed on both the sides of the vicinity of the end of the external connection terminal 103a as to provide thereby "a neck" in the end of the external connection terminal 103a. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a terminal connection method, a terminal connection structure, and an electronic circuit board, and more specifically, a terminal connection method capable of reliably connecting terminals, and a terminal connection with high connection reliability connected by this method. An object is to provide a structure and an electronic circuit board having the terminal connection structure.

  A wiring member called a bus bar is used for a power supply line of an electronic circuit board. The bus bar is an elongated metal plate and can handle a large current compared to a thin wiring such as a printed wiring. When connecting electronic parts such as FETs to the bus bar, the lead terminals of the electronic parts are connected to the external connection terminals of the bus bar. As a connection method at this time, arc welding is advantageous in terms of connection reliability and connection work. Are preferably used.

  When the external connection terminal of the bus bar and the lead terminal of the electronic component are connected by arc welding, an arc current is applied with the tip portions of both terminals being in close contact with each other. Since the tip portions of the two terminals are melted and joined by applying an arc current, both terminals can be securely and firmly connected.

  In connection by arc welding, it is necessary to dispose the tip portions of both terminals upward with respect to the circuit board surface and apply an arc current from above. Therefore, the external connection terminal of the bus bar is bent in a substantially L shape and the tip portion is provided upward with respect to the circuit board surface, and the middle of the lead terminal of the electronic component is bent in a substantially L shape, similar to the external connection terminal The tip portion is disposed upward with respect to the circuit board surface and is in close contact with the external connection terminal.

Another conventional method of connecting two circuit conductors is to provide a welded portion by bending the end portion of the bus bar for the connector, and projecting a projection on the welded surface, to the end portion of the bus bar for the fuse. There is also known a method in which a weld is formed, both are projection welded, and the projection is crushed and firmly welded (see Patent Document 1). In addition, a method is also known in which a concave portion is provided on one terminal side and a convex portion is provided on the other terminal side so that the conductors are securely connected to each other, and laser welding is performed after both are fitted (Patent Document). 2).
JP 2001-045634 A JP 2002-095124 A

  In the conventional terminal connection method described above, the bending angle of the external connection terminal of the bus bar and the lead terminal of the electronic component are both set to a right angle. However, if the tolerance is not a right angle but a slight acute angle, or if the tip of one terminal is warped opposite to the direction in which the other terminal exists, the tips of the two terminals are It will separate and a gap will be made between them. In this state, the terminals cannot be welded to each other, or the bonding strength between the terminals may be insufficient. If the bonding is insufficient, the terminals may be broken due to vibration or impact.

  In order to solve such problems, there is a method of pressing the tip of one terminal toward the other terminal using a spring mechanism to bring them into close contact with each other, but a spring mechanism is required, and every time arc welding is performed. Since the operation of pressing the terminal has to be performed, the welding work becomes very troublesome.

  Accordingly, an object of the present invention is to provide a terminal connection method capable of reliably and firmly connecting terminals. Another object of the present invention is to provide a terminal connection structure with high connection reliability connected by such a method. Still another object of the present invention is to provide an electronic circuit board having such a terminal connection structure.

  The object of the present invention is to bring the first and second terminals each having a spring property into contact with each other so as to bias each other, and the tip portion of the first terminal and the tip of the second terminal. This is achieved by a terminal connection method characterized in that the parts are connected by welding.

  According to the present invention, since the two lead terminals are biased to each other, both can be reliably and firmly connected.

  In a preferred embodiment of the present invention, the first terminal is an external connection terminal provided on the circuit board body, and the second terminal is a lead terminal of an electronic component mounted on the circuit board body. is there.

  According to a preferred embodiment of the present invention, since the terminal on the circuit board side always has a spring property, the two lead terminals are connected regardless of whether or not the lead terminal of the electronic component has a spring property. In doing so, they can be in a state where they are energized with each other.

  The object of the present invention is also provided with a first terminal and a second terminal, and the first terminal is a conductor piece bent in a substantially L shape, and at least a tip portion of the first terminal. Is inclined toward the arrangement direction of the second terminal in a state where no external force is applied, and the first tip portion and the tip portion of the second terminal are connected by welding. This is also achieved by the terminal connection structure that is characterized.

  In a preferred embodiment of the present invention, the first terminal is bent in a substantially L shape and the whole upright portion is inclined toward the arrangement direction of the second terminal.

  According to a preferred embodiment of the present invention, the inclination of the first terminal can be a simple shape, and the processing operation is easy.

  In a further preferred embodiment of the present invention, a notch portion is provided at a tip portion of the first terminal.

  According to a further preferred embodiment of the present invention, the molten portion at the tip of the terminal does not flow downward during welding and remains at the position of the cutout portion in the state of the metal ball, so that the position of the molten metal ball is stabilized. It can be made.

  In a further preferred embodiment of the present invention, the first terminal is an external connection terminal provided on the circuit board body, and the second terminal is a lead terminal of an electronic component mounted on the circuit board body. It is.

  The object of the present invention is also to connect a circuit board body, an external connection terminal provided on the circuit board body, and the external connection terminal and a lead terminal of an electronic component mounted on the circuit board body. The external connection terminal is a conductor piece bent in a substantially L shape, and at least a tip portion of the external connection terminal is not subjected to external force, the lead terminal of the electronic component is It is also achieved by an electronic circuit board characterized in that it is inclined toward the direction to be arranged, whereby the lead terminal arranged in the connection region can be biased by the external connection terminal.

  The object of the present invention is also to provide a circuit board body having a first terminal and an electronic component having a second terminal mounted on the circuit board body and electrically and mechanically connected to the first terminal. The electronic circuit board is characterized in that the first terminal and the second terminal are biased to each other.

  In a preferred embodiment of the present invention, the first terminal and the second terminal are connected by welding.

  ADVANTAGE OF THE INVENTION According to this invention, the terminal connection method which can connect a terminal reliably and firmly can be provided. Further, according to the present invention, it is possible to provide a terminal connection structure with high connection reliability connected by such a method. Furthermore, according to the present invention, it is possible to provide an electronic circuit board having such a terminal connection structure with high connection reliability.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a schematic perspective view showing a configuration of an electronic circuit board according to a preferred embodiment of the present invention, and shows a state before various electronic components are mounted.

  As shown in FIG. 1, the electronic circuit board 100 includes a circuit board body 101 formed of an insulating material, and a bus bar wired inside the circuit board body 101, which will be described in detail later. Various electronic components such as an FET 102 are mounted on the circuit board main body 101. The circuit board main body 101 is provided with a terminal slot (terminal through hole) 104 for accommodating the external connection terminal 103a of the bus bar. As shown in the drawing, the front end portion of the external connection terminal 103a penetrates the terminal slot 104 and the circuit board. The top surface of the main body 101 is pulled out. Further, the lead terminal 102a of the FET 102 is also inserted from below the terminal slot 104, whereby the external connection terminal 103a and the lead terminal 102a are connected.

  FIG. 2 is a schematic perspective view showing the configuration of the electronic circuit board 100, and shows a state in which various electronic components are mounted.

  As shown in FIG. 2, various electronic components such as an inductor and a capacitor are mounted on the main mounting region 101X on the road substrate body 101, and the above-described FET 102 is also mounted at a predetermined position. In this state, like the external connection terminal 103a, the tip portion of the lead terminal 102a of the FET passes through the terminal slot 104, which is a connection region of both terminals, and is drawn to the upper surface of the circuit board body 101.

  3 is an enlarged perspective view of a portion A shown in FIG. FIG. 4 is an enlarged view of a portion B shown in FIG. 3, and shows a state where the lead terminal 102a of the FET is omitted.

  As shown in FIGS. 3 and 4, a bus bar 103 is wired inside the circuit board body, and a part of the bus bar is bent into a substantially L shape to form an external connection terminal 103a. A portion of the external connection terminal 103 a that is upright from the board surface is inserted into the terminal slot, and this upright portion is not receiving external force, that is, the lead terminal 102 a is not inserted into the terminal slot 104. In the state, it is slightly inclined toward the lead terminal 102a side. Further, notches 103b are formed on both sides in the vicinity of the distal end of the external connection terminal 103a, thereby providing a “neck” at the distal end portion of the external connection terminal 103a.

  On the other hand, the lead terminal 102a of the FET 102 is also bent in a substantially L shape. The bending angle of the lead terminal 102a may be a right angle, but may be a slight obtuse angle. In a state where both the external connection terminal 103a and the lead terminal 102a are accommodated in the terminal slot 104 and are in contact with each other, the distal end portion of the external connection terminal 103a urges the distal end portion of the lead terminal 102a. The tip portions of each are in close contact with each other. Therefore, if arc welding is performed on both terminals, the two terminals can be reliably and firmly connected without using a spring mechanism or the like.

  Next, a method for connecting these two terminals will be described in detail with reference to FIGS.

  FIG. 5 is a schematic side view showing a connection state of two terminals, and shows a state before inserting the lead terminal of the FET into the terminal slot, that is, before contacting the two terminals.

  As shown in FIG. 5, the external connection terminal 103a of the bus bar is bent halfway, and the angle θ1 is set to an obtuse angle than 90 degrees, for example, within a range from 91 degrees to 95 degrees. The upright portion of the external connection terminal 103 a is accommodated in the terminal slot 104. On the other hand, the lead terminal 102a of the FET 102 is also bent halfway, and the angle θ2 is set to 90 degrees. The lead terminal 102a is inserted from the lower side of the terminal slot 104 and accommodated.

  FIG. 6 is a schematic side view showing the terminal connection structure, and shows a state where the second lead terminal is inserted into the terminal slot, that is, a state where two terminals are brought into contact with each other.

  As shown in FIG. 6, when the lead terminal 102a is inserted into the terminal slot 104 in which the external connection terminal 103a is already accommodated, the lead terminal 102a contacts the external connection terminal 103a, and the bending angle of the bus bar is θ1 ′ ( <Θ1). Since the bus bar generates a force to return to the original angle θ1, the bus bar itself functions as a leaf spring. That is, since the external connection terminal 103a biases the lead terminal 102a, the two terminals are brought into close contact with each other. If arc welding is performed on the two terminals in such a state, the tip portions of the two terminals can be reliably joined.

  FIG. 7 is a schematic front view showing the terminal connection structure, and shows a state after the above-described two terminals are arc-welded.

  As shown in FIG. 7, when arc welding is performed on two terminals, the tip portions of both terminals are joined. At this time, since the external connection terminal 103a has the constriction 103b, the melted portion at the tip does not flow down along the lead terminal 102a or the external connection terminal 103a, and the position of the constriction 103b remains in the state of the metal ball 103c. Stay in. Then, the metal ball 103c is cooled as it is, and both terminals are joined. Thus, by providing the constriction 103b at the tip of the external connection terminal 103a, the position of the molten metal sphere 103c can be stabilized.

  As described above, according to the present embodiment, the external connection terminal on the circuit board side is formed in a substantially L shape, and the entire upright portion is inclined toward the lead terminal side, Since the lead terminal set in the terminal is urged by the external connection terminal, the tip portions of both terminals can be brought into close contact with each other, and the two terminals can be securely and firmly joined by arc welding. it can. Therefore, a terminal connection structure with high connection reliability can be provided.

  FIG. 8 is a schematic perspective view schematically showing a terminal connection structure according to another preferred embodiment of the present invention.

  As shown in FIG. 8, this terminal connection structure has an external connection terminal 103a of a bus bar provided on a circuit board and a lead terminal 102a of an FET, but is bent into a substantially L shape. Of the portions 103m and 103n that stand upright from the substrate surface of the external connection terminal, only the portion 103n near the tip is inclined toward the lead terminal 102a. The external connection terminal 103a shown in FIG. Is different. In the present embodiment, the bending angle θ3 of the external connection terminal 103a of the bus bar is set to 90 degrees. The other points such as the external connection terminal 103a having a constriction, the shape of the lead terminal of the electronic component, and the bending angle θ2 are substantially the same as the terminal connection structure shown in FIGS.

  According to the present embodiment, as in the previous embodiment, the external connection terminal on the circuit board side is formed in a substantially L shape, and the tip portion of the upright portion is inclined toward the lead terminal side, so that the terminal slot Since the lead terminal 102a set in the terminal 104 is urged by the external connection terminal 103a, the tip portions of both terminals can be brought into close contact with each other, and the two terminals can be reliably and firmly secured by arc welding. Can be joined. Therefore, a terminal connection structure with high connection reliability can be provided.

  In the above-described embodiment, the case where the notch 103b is provided at the distal end portion of the external connection terminal 103a and thereby the “constriction” is formed at the distal end portion of the external connection terminal has been described. Various shapes are conceivable as the shape of the portion.

  FIGS. 9A and 9B are schematic perspective views showing other examples of the shape of the tip portion of the external connection terminal.

  The external connection terminal 901 shown in FIG. 9 (a) is that the tip end portion is formed in an elongated and projecting shape, and the tip end portion is provided with a “neck”, and the external connection terminal 103a shown in FIG. Is different. However, in this case, it can be considered that the cutout portion 902 is provided over the entire portion from the middle of the terminal to the tip. Due to the presence of the cutout portion 902, the molten portion at the tip at the time of welding is a lead terminal. Instead of flowing down through the external connection terminal 901, the metal ball remains in the position of the notch 902.

  Further, the external connection terminal 903 shown in FIG. 9B is provided with a “neck” at the tip portion in that a through hole 904 is formed in the center of the plate surface of the tip portion. This is different from the external connection terminal 103a shown in FIG. However, in this case as well, it can be considered that the central portion of the plate surface of the terminal is cut out, and the presence of the cutout portion 904 causes the molten portion at the tip during welding to be the lead terminal 102a or the external connection terminal 903. And stays at the position of the notch 904 in the state of a metal ball without flowing down.

  As described above, in the present invention, if notches having various shapes are formed in the tip portion of the external connection terminal, the molten portion at the tip of the terminal does not flow down during welding, and the metal ball Since it stays at the position of the notch in the state of, the position of the molten metal sphere can be stabilized.

  The present invention is not limited to the above embodiments, and various modifications can be made within the scope of the invention described in the claims, and these are also included in the scope of the present invention. Needless to say.

  For example, in the above-described embodiment, the case where the external connection terminal of the bus bar is connected to the lead terminal of the FET has been described, but the present invention is not limited to this. For example, a lead terminal of an electronic component other than an FET may be targeted, or a wiring other than a bus bar, for example, an external connection terminal connected to a printed wiring may be targeted.

FIG. 1 is a schematic perspective view showing a configuration of an electronic circuit board according to a preferred embodiment of the present invention, and shows a state before various electronic components are mounted. FIG. 2 is a schematic perspective view showing the configuration of the electronic circuit board 100, and shows a state in which various electronic components are mounted. 3 is an enlarged perspective view of a portion A shown in FIG. FIG. 4 is an enlarged view of a portion B shown in FIG. 3, and shows a state in which the lead terminal 102a of the FET is omitted. FIG. 5 is a schematic side view showing a connection state of two terminals, and shows a state before inserting the lead terminal of the FET into the terminal slot, that is, before contacting the two terminals. FIG. 6 is a schematic side view showing the terminal connection structure, and shows a state where the second lead terminal is inserted into the terminal slot, that is, a state where two terminals are brought into contact with each other. FIG. 7 is a schematic front view showing the terminal connection structure, and shows a state after arc welding of the two terminals described above. FIG. 8 is a schematic perspective view schematically showing a terminal connection structure according to another preferred embodiment of the present invention. FIGS. 9A and 9B are schematic perspective views showing other examples of the shape of the tip portion of the external connection terminal.

Explanation of symbols

100 Electronic Circuit Board 101 Circuit Board Body 101X Main Mounting Area for Electronic Components 102 FET
102a FET lead terminal 103 Bus bar 103a Bus bar external connection terminal 103b Notch 103c Metal ball 103m Part 103n of the external connection terminal standing upright from the substrate surface 104n Part of the external connection terminal near the tip 104 Terminal slot 104 Lead terminal 901 External connection Terminal 902 Notch 903 External connection terminal 904 Notch (through hole)

Claims (9)

Both the first and second terminals having spring properties are brought into contact with each other so as to urge each other.
The terminal connecting method, wherein the tip portion of the first terminal and the tip portion of the second terminal are connected by welding. The first terminal is an external connection terminal provided on the circuit board body,
The terminal connection method according to claim 1, wherein the second terminal is a lead terminal of an electronic component mounted on the circuit board body. A first terminal and a second terminal;
The first terminal is a conductor piece bent in a substantially L shape,
At least a tip portion of the first terminal is inclined toward the arrangement direction of the second terminal in a state where no external force is received,
The terminal connection structure, wherein the first tip portion and the tip portion of the second terminal are connected by welding.   4. The terminal according to claim 3, wherein the first terminal is bent in a substantially L shape and the whole upright portion is inclined toward the arrangement direction of the second terminal. 5. Connection structure.   5. The terminal connection structure according to claim 3, wherein a notch portion is provided at a tip portion of the first terminal. The first terminal is an external connection terminal provided on the circuit board body,
The terminal connection structure according to claim 3, wherein the second terminal is a lead terminal of an electronic component mounted on the circuit board main body. A circuit board body;
An external connection terminal provided on the circuit board body;
A connection region for connecting the external connection terminal and a lead terminal of an electronic component mounted on the circuit board body;
The external connection terminal is a conductor piece bent in a substantially L shape,
At least a tip portion of the external connection terminal is inclined toward a direction in which the lead terminal of the electronic component is to be arranged in a state where no external force is applied, thereby the lead terminal arranged in the connection region is An electronic circuit board which can be energized by the external connection terminal. A circuit board body having a first terminal;
An electronic component having a second terminal mounted on the circuit board body and electrically and mechanically connected to the first terminal;
The electronic circuit board, wherein the first terminal and the second terminal are biased to each other. The electronic circuit board according to claim 8, wherein the first terminal and the second terminal are connected by welding.

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