JP2010219072A - Connection terminal for circuit board - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a connection terminal for a circuit board which is compact, light, and economical, and capable of making connection with an insertion terminal easy and guaranteeing reliable fixing as well. <P>SOLUTION: A receiving terminal 22 is formed by a forming press, a flange part 22b is formed on an upper part of a cylindrical connection part 22a formed in a short cylindrical shape, and a tab 22c is provided on a part of the flange part 22b. The cylindrical connection part 22a is inserted and fixed into a terminal insertion hole 20e arranged on a resin plate 20 with the flange part 22b exposed on a surface, and the tab 22c is superimposed, welded and fixed on a foil circuit 21 on the resin plate 20. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a receiving terminal for a circuit board used in various electric circuits.

  For example, Patent Document 1 discloses a printed circuit board connection structure.

JP-A-8-222825

  However, the connection structure of Patent Document 1 has a problem that the number of parts is large.

  An object of the present invention is to provide a circuit board connection terminal that facilitates connection with an insertion end of a pin-shaped terminal and ensures secure fixation, and is small, light, and inexpensive.

  In order to achieve the above object, a circuit board connection terminal according to the present invention comprises a circuit board formed by positioning and fixing the foil circuit on the surface of the resin plate by inserting an anchor pin of the resin plate into a pin hole of the foil circuit. It is a receiving type connection terminal that is used by inserting into the terminal insertion hole provided in the terminal, and accepts the insertion end of the pin-shaped terminal. A short cylindrical connection part that receives the insertion end of the pin-like terminal, extends from a part of the flange part to the side, and is one side of the foil circuit. And a conductor connecting portion welded to the foil circuit using an electrode in contact with the front side and an electrode in contact with the foil circuit inserted from a welding hole provided on the back side of the circuit board. It is characterized by that.

  According to the circuit board connection terminal of the present invention, the insertion end of the pin-shaped terminal is received to enable reliable connection.

It is a disassembled perspective view of the upper case, circuit unit, and lower case which comprise a joint connector. It is a top view of a circuit board. It is a bottom view of a circuit board. It is a partial cross section figure of a circuit board. It is a partial cross section figure of the circuit board in the foil circuit which piled up two metal foils. It is a perspective view of a receiving terminal. It is principal part sectional drawing which laminated | stacked the circuit board which fixed the receiving terminal. It is a perspective view of an insertion terminal. It is sectional drawing of an insertion end. It is explanatory drawing of the manufacturing process of an insertion end. It is sectional drawing of a circuit board and a block body. It is explanatory drawing of the manufacturing process of a circuit board. It is explanatory drawing of the process of hold | maintaining a receiving terminal with a robot hand. It is explanatory drawing of the process of fixing a receiving terminal to a circuit board. It is explanatory drawing of the process of welding a receiving terminal to a foil circuit.

The present invention will be described in detail based on the embodiments shown in the drawings.
FIG. 1 is an exploded perspective view of a joint box using a receiving terminal which is a circuit board connection terminal according to the present invention. By assembling an upper case 11, a circuit unit 12 and a lower case 13 to each other, a box-shaped joint is obtained. A box is obtained. That is, when the circuit unit 12 is accommodated between the upper case 11 and the lower case 13 and the cases 11 and 13 are joined to each other, the lock portions provided in the upper case 11 and the lower case 13 with the circuit unit 12 accommodated. Locked by 14a and 14b.

  A circuit pattern (not shown) is formed on the upper surface of the circuit unit 12, and a synthetic resin block body 16 to which a plurality of insertion terminals 15 are attached is disposed. The block body 16 is fitted to a frame portion 17 partitioned by the upper case 11, and connecting portions such as a flat blade end 15 a, a receiving end 15 b, and a pin end 15 c of the insertion terminal 15 protruding on the block body 16 are formed in the upper case 11. A connector that accommodates a fuse element, a switch element, or other connection terminals can be attached to these connection parts.

  The lower case 13 is also formed with a frame portion 18, which is not shown, but the connecting end of the insertion terminal 15 protrudes downward from the block body 16 attached to the lower surface of the circuit unit 12. Similar elements, connectors, and the like can be mounted on the lower surface of the.

  For example, five circuit boards 19 are laminated in the circuit unit 12, and as shown in FIGS. 2 and 3, each circuit board 19 is a resin plate made of synthetic resin and having a maximum thickness of about 1.5 mm, for example, formed by injection molding. A foil circuit 21 having a pattern made of, for example, a copper foil having a thickness of 120 μm and partitioned differently for each laminated circuit board 19 is placed on 20.

  As shown in FIG. 4, a plurality of anchor pins 20 a protrude upward in the resin plate 20, are inserted into pin holes 21 a provided in the foil circuit 21, and the upper portions of the anchor pins 20 a are crushed by heat, The foil circuit 21 is positioned and fixed to the resin plate 20.

  Depending on the current capacity, a part of the foil circuit 21 may be formed of two or more layers of metal foil as shown in FIG. 5, fixed by a high anchor pin 20 a ′, and perforated in the resin plate 20. The metal foil is welded by inserting a welding electrode from the welded hole 20b.

  As shown in FIGS. 2 and 3, circular terminal insertion holes 20c common to the laminated resin plates 20 are formed at a plurality of locations on the resin plate 20. The terminal insertion holes 20c of the circuit board 19 of a predetermined layer are formed in the terminal insertion holes 20c. A receiving terminal 22 is attached. The receiving terminal 22 has several sizes depending on the required current capacity, and several types of diameters of the terminal insertion holes 20c are provided accordingly.

  The receiving terminal 22 is made of, for example, a brass plate having a thickness of 0.2 mm, and is formed by a forming press. As shown in FIG. 6, a flange portion 22b is formed on the upper portion of the cylindrical connecting portion 22a formed in a short cylindrical shape. A tab 22c is attached to a part of the flange portion 22b. In addition, the boundary part of the cylindrical connection part 22a and the flange part 22b is made into the taper-shaped guide part 22d for receiving the insertion terminal mentioned later.

  FIG. 7 is a cross-sectional view of the main part of the circuit unit 12 in a state where five circuit boards 19 are stacked and the receiving terminals 22 are fixed. The diameter of the intermediate portion of the terminal insertion hole 20c of the circuit board 19 It is assumed that the outer diameter of the cylindrical connection portion 22a is substantially the same, and the periphery of the upper portion of the terminal insertion hole 20c is an annular portion 20d lifted upward, and the flange portion 22b of the receiving terminal 22 is mounted in the annular portion 20d. A stepped portion 20e is formed, and an inner diameter of the lower portion of the terminal insertion hole 20c is increased in order to expand the lower end of the cylindrical connecting portion 22a.

  The cylindrical connection portion 22a of the receiving terminal 22 is disposed in the terminal insertion hole 20c, and the lower end of the cylindrical connection portion 22a is caulked and fixed to the lower portion of the terminal insertion hole 20c. The expansion of the lower end of the cylindrical connection portion 22a is mainly intended to fix the receiving terminal 22 to the circuit board 19, but also serves as a tapered guide portion 22e when the insertion terminal 15 is inserted from the lower surface direction. . The tab 22c is connected to the foil circuit 21 of the circuit board 19 by welding, and for this welding, a welding hole 20f for electrode insertion is formed in the resin plate 20 below the tab 22c. ing.

  In the terminal insertion hole 20c to which the receiving terminal 22 of the circuit board 19 is not attached, an annular portion 20g is formed around the upper portion thereof so that the insertion terminal 15 inserted into the terminal insertion hole 20c does not come into contact with the foil circuit 21. ing. The annular portion 20g provided on the uppermost circuit board 19 of the circuit unit 12 includes an annular portion 20d provided in the hole portion 20c to which the receiving terminal 22 is attached in order to stably place the block body 16. It is the same height.

  As shown in FIGS. 2 and 3, a wire groove 20h is formed on the lower surface side of the resin plate 20 as necessary, and for example, a rectangular electric wire 23 in which an insulating paint is applied in the wire groove 20h is provided. The both ends of the rectangular electric wire 23 are raised through the wire holes 20i provided at both ends of the wire groove 20h and welded to the lower surface of the foil circuit 21, and the surface of the resin plate 20 is designed for circuit design. In FIG. 2, the patterns of the foil circuits 21 that cannot be short-circuited are short-circuited as jumper wires. In addition, this square-shaped electric wire 23 is used in various cross-sectional areas depending on the current capacity.

  The heat-melted upper end portion, the annular portion 20d, and the receiving terminal 22 of the anchor pin 20a of the circuit board 19 are fitted into a recess formed in the lower surface of the upper resin plate 20, and the stacked circuit boards 19 are in close contact with each other. At the same time, it is prevented from shifting in the horizontal direction. For example, the recess 20j shown in FIG. 3 is a portion into which the receiving terminal 22 attached to the lower circuit board 19 is fitted. The through holes 24 provided at the four corners of the circuit board 19 are alignment holes when the circuit boards 19 are stacked.

  2 and 3 provided in the circuit board 19 is attached with the connection terminal 26 for large current shown in FIG. 1 when the insertion terminal 15 and the receiving terminal 22 have insufficient current capacity. This is provided only on the uppermost circuit board 19 of the circuit unit 12.

  The circuit board 19 is not necessarily laminated with all the foil circuits 21 facing up. In FIG. 7, the upper three-layer circuit board 19 is laminated with the foil circuits 21 facing up, and the lower two-layer circuit. The substrate 19 is laminated with the foil circuit 21 facing downward. Also in this case, the circuit board 19 in which the lower surfaces of the third layer and the fourth layer are overlapped is not shown, but can be partially fitted so as not to be displaced.

  FIG. 8 is a perspective view of the insertion terminal 15 for insertion into the receiving terminal 22, and the lower portion of the insertion terminal 15 has a substantially square cross section as shown in FIG. 9 for insertion into the cylindrical connection portion 22 a of the receiving terminal 22. A pin-like insertion end 15d is formed, and an upper portion projects from the upper case 11 through an intermediate portion 15e to form a flat blade end 15a for connection to another connection terminal. The flat blade end 15a may be the receiving end 15b or the pin end 15c shown in FIG.

  The insertion terminal 15 is manufactured by cutting and molding a metal plate 31 made of brass having a thickness of 0.3 mm, for example, and the insertion end 15d is formed by forging while laminating the metal plates 31 as shown in the process of FIG. Has strength. That is, the metal plate 31 is raised upward with respect to the base 34 like both side portions 32 and 33 along the longitudinal direction of the metal plate 31 as shown in (a), and both side portions as shown in (b). 32 and 33 are bent inward, and further folded on the base 34 as shown in FIG.

  Subsequently, as shown in FIG. 9 (d), the folded side portions 32 and 33 are raised together with the base portion 34, the both side portions 32 and 33 are brought into close contact with each other, and mechanically compressed from four sides, as shown in FIG. Shape. In addition, as shown in FIG.10 (d), it is good also as the shape where the base part 34 swelled below frequently.

  According to the insertion end 15d, the thin metal plate 31 is bent and formed into a bar shape having a substantially rectangular cross section having no cavity and having a width in the vertical direction. Therefore, even when the metal plate 31 is thin. The insertion end 15d having a sufficiently large thickness on one side compared to the thickness of the metal plate 31 can be obtained, and the insertion end 15d is less likely to be bent or broken. The upper flat blade end 15a is also thickened by folding the metal plate 31 twice.

  Further, a plurality of step portions may be formed on the insertion end 15d in order to obtain a click feeling when inserted into the receiving terminal 22 and to improve the connection. Also, several types of these insertion ends 15d are prepared according to the size of the receiving terminal 22.

  Intermediate portions 15e of several insertion terminals 15 are inserted and fixed in insertion holes provided in the block body 16 made of a synthetic resin material, and the insertion ends 15d are collectively connected to the circuit board 19 as shown in FIG. Has been inserted. The intermediate portion 15e of the insertion terminal 15 is provided with a claw portion (not shown) for fixing to the insertion hole.

  As shown in FIG. 11, one or a plurality of downwardly facing anchor pins 16 a are integrally formed at the bottom of the block body 16, and are provided in common to the pin holes 21 b provided in the foil circuit 21 and the resin plates 20. The block body 16 is fixed to the circuit unit 12 by melting and crushing the lower end of the anchor pin 16a that is inserted into the pin hole 20k and protrudes downward from the lowermost circuit board 19, and the circuit board 19 is laminated. The body is fixed inseparably.

  FIG. 12 is an explanatory diagram of the manufacturing process of the circuit board 19. A copper foil 41 as a base material of the foil circuit 21 is wound around a roller 42 in a coil shape, and is intermittently fed out by a feed roller 43 based on pilot holes previously formed in the copper foil 41. The copper foil 41 is conveyed to a punching press process, and pin holes 21 a and 21 b are drilled at a plurality of predetermined positions by the punching press 44 and transferred to the stacking process with the resin plate 20. The pin hole 21 a provided in the copper foil 41 is for fixing the foil circuit 21 to the resin plate 20, so that it remains on the resin plate 20 and is provided in a portion to be the foil circuit 21.

  On the other hand, the resin plates 20 are stacked on the stocker 45 and are taken out one by one in synchronization with the transport of the copper foil 41. The resin plate 20 is manufactured by injection molding of a synthetic resin film or hot pressing a synthetic resin base material, and includes an anchor pin 20a, holes 20b and 20f, a terminal insertion hole 20c, a pin hole 20k, an annular portion 20d and 20g, and an electric wire. The groove portion 20h, the through hole 24, etc. are already formed.

  When one resin plate 20 is placed on the stacking table 46, the stacking table 46 rises and is pushed up toward the copper foil 41. The position of the stacking table 46 is three-dimensionally controlled by image processing by the imaging camera 47 so that the anchor pin 20a of the resin plate 20 enters the pin hole 21a drilled in the copper foil 41.

  In particular, in the foil circuit 21 that requires a current capacity, the copper foil 41 is doubled as described above to reduce the electrical resistance. Therefore, the above process is repeated twice, and the stacked copper is repeated by a process (not shown). The foils 41 are welded together using the welding hole 20b provided in the resin plate 20 as shown in FIG.

  After the anchor pin 20a is inserted into the pin hole 21a and the copper foil 41 is stacked on the resin plate 20, the hot press 48 positioned above the stacking base 46 is lowered, and the top of the anchor pin 20a is crushed by heat, and the copper foil 41 is prevented from peeling from the resin plate 20. In addition, the pin hole 21b of the copper foil 41 which penetrates the anchor pin 16a of the block body 16 corresponds with the pin hole 20k of the resin plate 20 with alignment.

  Subsequently, the copper foil 41 integrated with the resin plate 20 is conveyed to a punching press 49, and the foil circuit 21 is punched from the copper foil 41 while performing image processing. The upper punching press 49 has a big blade 49a and punches the foil circuit 21 from the copper foil 41 without damaging the resin plate 20. The circuit pattern of the foil circuit 21 is punched by the big blade 49a.

  Further, the copper foil 41 is transported together with the resin plate 20, and the remaining copper foil 41 that is not used in the foil circuit 21 is peeled off from the resin plate 20 and then chopped by the remaining material processing blade 50, and is left in the remaining material box 51. Dumped. On the other hand, the resin plate 20 on which the foil circuit 21 is integrally fixed to the surface is carried out in a predetermined direction as the circuit board 19 and stacked in the stocker 52.

  FIG. 13 to FIG. 15 are explanatory views of a process of fixing the receiving terminal 22 to the circuit board 19. The receiving terminal 22 arranged and supplied by the parts feeder is picked up by an imaging camera 62 by a robot hand 61 as shown in FIG. Is held while performing image processing, and is transported to a necessary portion of the circuit board 19. The robot hand 61 is provided with a lifting pin 64 that can move up and down with respect to the cylindrical portion 63. The lifting pin 64 is inserted into the cylindrical connecting portion 22a of the receiving terminal 22, and the receiving terminal 22 is lifted by frictional resistance. The receiving terminal 22 is inserted into the terminal insertion hole 20 c of the resin plate 20 while adjusting the position by image processing so that the tab 22 c of the receiving terminal 22 is placed on the foil circuit 21.

  While the receiving terminal 22 is pressed onto the step portion 20e of the resin plate 20 by the cylindrical portion 63, the lifting pin 64 is lifted upward as shown in FIG. 14, and then the press pin 65 having a conical tip is lifted from below. Then, the lower part of the cylindrical connection part 22a is pushed and expanded, and the receiving terminal 22 is caulked to the lower part of the terminal insertion hole 20c.

  Thereafter, as shown in FIG. 15, the tab 22 c is welded to the foil circuit 21 using the electrodes 66 and 67. The tips of the electrodes 66 and 67 each have a small round shape with a diameter of about 1 mm, the upper electrode 66 contacts the tab 22c, and the lower electrode 67 contacts the lower surface of the foil circuit 21 via the welding hole 20f. To do. This welding can be performed sequentially by a robot hand, but can also be performed at once using a large number of electrodes.

  A plurality of circuit boards 19 each having a different circuit pattern are laminated, and the block body 16 is placed on the laminated body of the circuit boards 19 and fixed to the block body 16 as shown in FIG. When the insertion end 15 d of the inserted terminal 15 is inserted into the terminal insertion hole 20 c of the circuit board 19, the insertion end 15 d is inserted into the cylindrical connection portion 22 a of the receiving terminal 22 attached to at least one of the circuit boards 19. .

  At this time, since the insertion end 15d has a substantially square cross section, when the insertion end 15d is inserted into the cylindrical connection portion 22a of the receiving terminal 22, the corner is in good contact, and the insertion terminal 15 is connected to any of the circuit boards 19. A good electrical connection with the foil circuit 21 is made. If necessary, the block body 16 is also mounted from the lower surface side of the circuit unit 12.

  Simultaneously with the insertion of the insertion end 15d, the anchor pin 16a protruding from the block body 16 penetrates the pin hole 20k of the laminated body of the circuit board 19, so that the circuit unit 12 is completed when the tip protruding from the pin hole 20k is melted.

  The circuit unit 12 is sandwiched between the upper case 11 and the lower case 13, and the cases 11 and 13 are locked to each other by the lock portions 14a and 14b. By attaching various elements and connectors to the flat blade end 15a, the receiving end 15b, and the pin end 15c of the insertion terminal 15 protruding from the surfaces of the upper case 11 and the lower case 13, as described above, it functions as a joint box.

11 upper case 12 circuit unit 13 lower case 15 insertion terminal 15d insertion end 16 block body 19 circuit board 20 resin plate 20c terminal insertion hole 21 foil circuit 22 receiving terminal

Claims (4)

  Insert the pin pin into the terminal insertion hole provided on the circuit board that is positioned and fixed on the surface of the resin plate by inserting the anchor pin of the resin plate into the pin hole of the foil circuit. A receiving-type connection terminal for receiving an end, wherein a flange portion is provided around an upper portion and fixed downward with respect to the terminal insertion hole by the flange portion, and a lower end is disposed in the terminal insertion hole, and the pin-shaped terminal A cylindrical connecting portion having a short cylindrical shape for receiving the insertion end of the first and second electrodes, extending from a portion of the flange portion to the side, overlapping with a portion of the foil circuit, and provided on the back side of the circuit board and an electrode in contact with the front side A circuit board connection terminal comprising: a conductor connection portion welded to the foil circuit using an electrode inserted from the welding hole portion and brought into contact with the foil circuit.   2. The circuit board connection terminal according to claim 1, wherein a boundary portion between the cylindrical connection portion and the flange portion is tapered to serve as a guide portion of an insertion end of the pin-shaped terminal.   The circuit board connection terminal according to claim 1, wherein the conductor connection portion is a tab, and the tab is welded to the foil circuit.   The circuit board connection terminal according to any one of claims 1 to 3, wherein a lower end of the cylindrical connection portion is expanded and caulked to the circuit board.

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