JP2015126152A - Method for manufacturing printed circuit board having electrical component connection unit and electric circuit arrangement including printed circuit board obtained thereby - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a new method for manufacturing a printed circuit board including an electrical component connection unit, capable of automatically mounting an electrical component connection unit on the printed circuit board by reflow-soldering without requiring a conveyance jig even when the electrical component connection unit is provided over the approximately full length of an edge part of the printed circuit board in the width direction, and an electric circuit arrangement including the printed circuit board obtained by the new manufacturing method.SOLUTION: A method for manufacturing a printed circuit board including an electrical component connection unit comprises: the printed circuit board preparation step of preparing a printed circuit board 12 having a pair of waste boards 80 and 80 supported by a conveyance rail 90 and removably coupled; the reflow step of supporting the pair of waste boards 80 and 80 by the conveyance rail 90 in the state of mounting an electrical component connection unit 18 on a mounting part 16 to convey the printed circuit board 12 to a reflow furnace; and the removal step of removing the waste boards 80 after the reflow step.

Description

  The present invention relates to a printed circuit board manufacturing method in the case where an electrical component connection unit is automatically mounted on a printed circuit board by reflow soldering, and an electric circuit device in which the printed circuit board obtained by the manufacturing method is incorporated. .

  Conventionally, electrical circuit devices such as electrical junction boxes and control units used in automobile electrical systems have built-in printed circuit boards on which electrical component connection units to which connectors and fuses are mounted are mounted. Parts can be connected from the outside.

  By the way, as such an electric circuit device, as described in, for example, Japanese Patent Application Laid-Open No. 2012-115052, (Patent Document 1), the printed circuit board has a substantially entire length in the width direction of one edge portion of the printed circuit board. A device provided with a side connection type electrical component connection unit to which external components such as a connector and a fuse are connected from the side is known. In this way, the electric circuit device can be miniaturized and densified by skillfully utilizing the edge portion of the printed circuit board to mount the electrical component connection unit.

  However, as described above, when the electrical component connection unit is automatically mounted on the printed circuit board by the reflow soldering process, there is a problem that it is difficult to secure a mounting cost of the printed circuit board to the transfer device. That is, when the electrical component connection unit is automatically mounted on the printed circuit board by the reflow soldering process, both ends of the printed circuit board are locked to a pair of conveyance rails that are spaced apart from each other and extend in parallel, and passed through the reflow furnace. Become. At that time, in the structure where the electrical component connection unit is provided over the entire length in the width direction of the edge of the printed circuit board, the soldering area is provided up to both ends of the printed circuit board. This makes it difficult to place the substrate.

  On the other hand, it has been proposed to hold both ends of the printed circuit board using a transport jig and to support the transport jig on the transport rail, but the cost is increased by using the transport jig. At the same time, since a manual work such as increasing the width of the transport rail corresponding to the transport jig or mounting the printed circuit board on the transport jig is required, a human error may occur.

JP 2012-115052 A

  The present invention has been made in the background of the above-mentioned circumstances, and the problem to be solved is that even when the electrical component connection unit is provided over the entire length in the width direction of the edge portion of the printed circuit board, the conveying jig is provided. The present invention relates to a novel method for manufacturing a printed circuit board having an electrical component connection unit, which can automatically mount the electrical component connection unit on the printed circuit board by reflow soldering. The present invention also relates to an electric circuit device incorporating a printed circuit board obtained by such a novel manufacturing method.

  A first aspect of the present invention relating to a method for manufacturing a printed circuit board including an electrical component connection unit is a method for manufacturing a printed circuit board including an electrical component connection unit, which covers substantially the entire length in the width direction of the edge portion. A printed circuit board that prepares a printed circuit board in which a pair of discarded boards supported by a transport rail are removably connected to a widened mounting part and both side edge parts orthogonal to the both ends in the width direction of the edge part After the reflow process, a reflow process in which the pair of discarded boards are supported by the transport rails and the printed circuit board is transported to a reflow furnace in a state where the electrical component connection unit is mounted on the mounting portion. A cutting step of cutting the discarded substrate.

  According to the method of manufacturing a printed circuit board provided with the electrical component connection unit of the present invention, a pair of discarded substrates is provided on both side edges of the printed circuit board perpendicular to both widthwise end portions of the mounting portion provided on the edge of the printed circuit board. Are removably connected. Thereby, in a reflow process, a printed circuit board can be supported on a conveyance rail, without using a conveyance jig. Therefore, it is possible to reduce the manufacturing cost by eliminating a separate component conveying jig. In addition, since the printed circuit board can be supported on the transport rail using a discarded board provided in advance on the printed circuit board, human work such as changing the width of the transport rail or mounting the transport jig on the printed circuit board can be performed. It is possible to eliminate the occurrence of mistakes associated therewith. Therefore, it is possible to improve efficiency and reliability of the process of automatically mounting the electrical component connection unit on the printed circuit board by reflow soldering.

  A first aspect of the present invention relating to an electric circuit device with a built-in printed circuit board is that an electrical component connecting unit is mounted by reflow soldering on a mounting portion that extends over substantially the entire length of the edge portion in the width direction. An electric circuit device having a printed circuit board built therein, wherein the printed circuit board is obtained by the method for manufacturing a printed circuit board including the electrical component connection unit according to the first aspect. And

  According to the present invention relating to the electric circuit device incorporating the printed circuit board, since the printed circuit board is obtained according to the manufacturing method of the present invention, the electrical component connection unit is printed as in the manufacturing method of the present invention. It is possible to improve the efficiency and reliability of the process of automatically mounting on the substrate by reflow soldering, and to reduce the cost of the entire electric circuit device and improve the connection reliability.

  A second aspect of the present invention relating to an electric circuit device incorporating a printed circuit board is the electric circuit device incorporating the printed circuit board described in the first aspect, wherein the printed circuit board has an opening on one side surface. The rectangular box-shaped case is housed, and the opening of the case is covered with the electrical component connecting unit, and is opposed in the width direction of the edge portion of the printed circuit board. A pair of opposing side surfaces of the case extend in the extending direction of both side edge portions of the printed board with a distance between the opposing surfaces slightly larger than the widthwise dimension of the end edge portion.

  According to this aspect, the opening of the rectangular box-shaped case that accommodates the printed circuit board is covered with the electrical component connecting unit, and the pair of opposed side surfaces that face each other in the width direction of the edge portion of the printed circuit board are provided. , They extend in parallel with each other at a distance between the facing surfaces that is slightly larger than the widthwise dimension of the edge. Thus, the electric circuit device can be configured with a small number of parts, and the outer shape can be made compact.

  In particular, the pair of opposing side surfaces of the case facing each other in the width direction of the edge portion of the printed circuit board are disposed at a distance between the facing surfaces that is slightly larger than the width direction dimension of the edge portion. There is a restriction that the substrate cannot be made larger. Even in such a case, using the discarded board provided on the printed circuit board, the electric component connection unit extending over the substantially entire length in the width direction of the edge part of the printed circuit board can be supported on the transport rail, Automatic mounting by reflow soldering can be performed efficiently and without human error. Therefore, it is possible to achieve both the miniaturization of the electric circuit device and the efficiency of the mounting process.

  In the present invention, a pair of discarded substrates is connected to both side edges of the printed circuit board orthogonal to both end portions in the width direction of the printed circuit board so as to be excised. Thereby, since a printed circuit board can be supported on a conveyance rail, without using a conveyance jig in a reflow process, manufacturing cost can be reduced. In addition, since manual work such as changing the width of the transfer rail and mounting the transfer jig on the printed circuit board can be eliminated, the associated mistakes can be prevented and the reflow process can be made more efficient and reliable. It is possible to improve the performance.

The perspective view which shows the assembly | attachment middle state of the electric circuit apparatus as one Embodiment of this invention. The top view of the electric circuit apparatus shown in FIG. The bottom view of the electric circuit apparatus shown in FIG. The top view which shows the assembly | attachment state of the electric circuit apparatus shown in FIG. The perspective view which looked at the side connection type connector shown in FIG. 1 from the downward direction. The top view which shows the state before mounting the side connection type connector etc. of the printed circuit board shown in FIG. The top view for demonstrating the reflow process after mounting a side connection type connector etc. on the printed circuit board shown in FIG.

  Embodiments of the present invention will be described below with reference to the drawings.

  First, FIG. 1 to FIG. 4 show an electric circuit device 10 incorporating a printed circuit board as one embodiment of the present invention. The electric circuit device 10 is, for example, arranged between a power source such as an automobile battery and a load such as various electrical components, and is used as an electrical junction box for controlling power supply to various electrical components. The circuit board 12 includes a side connection connector 18 that is an electrical component connection unit provided on the mounting portion 16 of the edge portion 14 of the printed circuit board 12, and a case 20. Then, a rectangular box-shaped case 20 having one side 22 as an opening 24 is attached to the side connection connector 18 provided on the printed circuit board 12 from the printed circuit board 12 side. The case 20 is assembled to the side connection connector 18 in a state where the substrate 12 is housed in the case 20 and the opening 24 of the case 20 is covered with the side connection connector 18. In the following description, “upper” means the upper side in FIG. 1, “lower” means the lower side in FIG. 1, “front” means the left side in FIG. 1, and “rear” means the right side in FIG. Shall.

  As shown in FIG. 5, the side-connecting connector 18 has a long rectangular block shape as a whole, and is integrally formed by injection molding or the like with a synthetic resin such as polypropylene (PP) or polyamide (PA). Has been. A plurality of terminal holding portions 28 protrude from the rear surface 26 of the side connection type connector 18, and a number of connection terminal insertion holes 30 are formed in the terminal holding portion 28 so as to open rearward. In addition, the side connection connector 18 includes a plurality of connection terminals 32. These connection terminals 32 have an L-shaped bent shape, and one end side 34 is connected to a conductive path (not shown) of the printed circuit board 12 by soldering, while the other end side 36 is accommodated in the connection terminal insertion hole 30.・ It is designed to be held. On the other hand, a plurality of connector housing portions 40 are formed in the front surface 38 of the side connection type connector 18 so as to open toward the front, and the other end side 36 of the connection terminal 32 protrudes inside the connector housing portion 40. Has been. Then, when a mating connector (not shown), which is an external electrical component, is housed in the connector housing portion 40, the printed circuit board 12 and the mating connector are electrically connected via the connection terminal 32. ing.

  Further, lock claws 44 are formed to protrude outwardly on both longitudinal sides of the upper surface 42 of the side connection type connector 18, and a pair of guide portions 46, 46 are located on both sides of the lock claws 44. Is formed. The guide portions 46, 46 protrude outward from the upper surface 42 of the side connection type connector 18, and have a reverse L-shaped cross-sectional shape with a protruding end edge bent at a right angle, and are opposite to the lock claw 44. It is extended toward.

  In addition, engaging groove portions 48 are extended from the rear surface 26 of the side connection type connector 18 toward the front surface 38 in an L-shaped cross section at both longitudinal ends of the upper surface 42 of the side connection type connector 18. In addition, the side connection connector 18 is formed to be open to the upper surface 42 and the rear surface 26. Further, an engaging groove portion 50 opened to the upper surface 42 and the rear surface 26 of the side connection type connector 18 extends in the center of the longitudinal direction of the upper surface 42 of the side connection type connector 18 with an inverted T-shaped cross section. Has been issued.

  On the other hand, as shown in FIG. 5, the top surface of the side connection type connector 18 is also formed on the bottom wall portion 52 located on the printed circuit board 12 side of the side connection type connector 18 when mounted on the printed circuit board 12. 42, a pair of guide portions 56, 56 provided on both sides of the lock claw 54 and the lock claw 54 having the same structure as that formed on the upper surface 42 of the side connection connector 18. And the engaging groove part 58 and the engaging groove part 60 are protrudingly provided.

  In addition, the center portion of the bottom wall portion 52 of the side connection type connector 18 is provided with split pins 62 protruding downward at three locations. The split pin 62 is formed by arranging a pair of protrusions having a substantially semicircular cross-sectional shape and a protruding end portion having an enlarged diameter so that the arc portions face each other with a slight distance therebetween. By pushing the protruding end portion of the split pin 62 into the insertion hole 74, the protruding end portions of the pair of protrusions are elastically deformed in the opposing direction, and after insertion, the expanded diameter portion of the protruding end portion is printed by elastic recovery. The bottom wall 52 of the side connection type connector 18 is fixed to the printed circuit board 12 by engaging with the outer edge of the pin insertion hole 74 of the circuit board 12. In addition, mounting auxiliary pieces 64 projecting in a substantially rectangular shape toward the rear are provided at both ends in the longitudinal direction of the bottom wall portion 52 of the side connection type connector 18, and the side connection type connector 18 is printed. It can be stably held on the substrate 12.

  As shown in FIGS. 2 to 3, the printed circuit board 12 has a substantially rectangular plate shape, and a relay 70 (shown in FIG. 1 and FIG. 1) with respect to the front surface 66 and the back surface 68 of the printed circuit board 12. 2), a semiconductor element such as an integrated circuit, a resistance element and other electric circuit elements are appropriately mounted. Further, the end edge portion 14 of the printed circuit board 12 is configured with a mounting portion 16 that extends over substantially the entire length of the end edge portion 14 in the width direction. The mounting portion 16 has a large number of terminal insertion holes 72 penetrating in two rows along the edge portion 14, and pin insertion holes 74 penetrating at three locations. A cutout 76 is formed by cutting the substrate 12 into a substantially rectangular shape.

  Next, an embodiment of the present invention relating to a method for manufacturing the printed circuit board 12 including the side connection type connector 18 will be described with reference to FIGS. 6 and 7. First, as shown in FIG. 6, a sheet-like substrate 78 is prepared. The board 78 includes a pair of printed boards 12 and 12, a pair of discarded boards 80 and 80, and a connecting portion 82 for connecting them. More specifically, in the sheet-like substrate 78, the pair of printed circuit boards 12 and 12 are removably connected by the connecting portion 82 at the other end edge portion 84 which is the opposite side of the end edge portion 14. The pair of printed circuit boards 12 and 12 are removably connected to the pair of discarded boards 80 and 80 at the side edges 86 and 86 perpendicular to both ends in the width direction of the edge 14 of the pair of printed circuit boards 12 and 12. In addition, through holes 88 are provided at both ends in the longitudinal direction of the pair of discarded substrates 80, 80. The printed circuit board 12 having such a configuration is prepared in the printed circuit board preparation step.

  Subsequently, as shown in FIG. 7, the side connection type connector 18 is mounted on the mounting portion 16 provided on the end edge portion 14 of the pair of printed circuit boards 12 and 12. At this time, one end side 34 of the connection terminal 32 provided in the side connection type connector 18 is inserted into the terminal insertion hole 72 provided in the mounting portion 16 and pre-applied with solder, and The split pin 62 provided in the bottom wall portion 52 is inserted into the pin insertion hole 74 provided in the mounting portion 16. As a result, the locking claw 54 and the pair of guide portions 56, 56 provided on both sides of the locking claw 54 and the engaging groove 58 are projected from the bottom wall portion 52 of the side connection type connector 18. A groove 60 projects downward from a notch 76 formed in the printed circuit board 12 (see FIG. 3). In addition, a semiconductor element such as an integrated circuit, a resistance element, and other electric circuit elements are mounted on the front surface 66 and the rear surface 68 of the pair of printed circuit boards 12 and 12 in addition to the relay 70 as illustrated. Then, the pair of discarded substrates 80, 80 of the substrate 78 configured in this way is placed on the pair of transport rails 90, 90. The transport rail 90 is provided with a protrusion 92, and the pair of discard substrates 80, 80 are supported by the pair of transport rails 90, 90 by fitting the protrusion 92 into a through hole 88 provided in the discard substrate 80. Thus, the substrate 78 including the printed circuit board 12 is transferred to a reflow furnace (not shown). As a result, components such as one end side 34 of the connection terminal 32 provided on the side connection type connector 18 and the relay 70 are reflow soldered to the printed circuit board 12. Such a series of operations is performed in the reflow process.

  After the reflow process, an excision process is performed in which the pair of discarded substrates 80 and 80 are excised from the substrate 78 by bending at the connecting portion 82 or the like. The pair of printed circuit boards 12 and 12 can be divided by, for example, further bending the pair of printed circuit boards 12 and 12 thus configured at the connecting portion 82. Thereby, manufacture of the printed circuit board 12 provided with the side connection type connector 18 according to the manufacturing method of this embodiment is completed.

  As shown in FIGS. 1 to 4, the case 20 of the electric circuit device 10 has a bottomed box shape opening forward, while the opening 24 of the case 20 is a side connection type in a front view. The connector 18 is formed in a substantially rectangular shape that is substantially the same as the rear surface 26 of the connector 18, and is integrally formed of, for example, a synthetic resin such as polypropylene (PP) or polyamide (PA) by injection molding or the like. More specifically, as shown in FIGS. 1 and 2, a pair of opposing side surfaces 94, 94 of the case 20 that face each other in the width direction of the end edge portion 14 of the printed circuit board 12 are formed on the edge of the printed circuit board 12. The width direction dimension of the portion 14 is set to extend in the extending direction of the side edge portions 86 and 86 of the printed board 12 with a distance L2 between the facing surfaces slightly larger than L1.

  Two engaging frames 98 and 98 are formed on the front end portion of the upper wall portion 96 of the case 20. The engagement frame 98 is formed by extending the front end portion of the upper wall portion 96 of the case 20 forward from the cutout portion 100 cut out in a substantially rectangular shape, while the side connection type connector 18 is formed in the center portion. An engagement hole 102 that engages with the lock pawl 44 is provided. In addition, an engaging projection (not shown) that protrudes inward in a substantially T shape is provided at the center of the inner surface of the front end portion of the upper wall portion 96 of the case 20, while the upper wall portion of the case 20 is provided. Engagement projections 104 projecting in an approximately L-shape toward the inside are provided on both ends of the inner surface of the front end portion of 96 (see FIG. 1).

  Similarly, two engagement frames 108, 108 having the same shape as the engagement frame 98 are formed at the front end portion of the bottom wall portion 106 of the case 20. Further, an engagement protrusion 110 (not shown) that protrudes in a substantially T shape and an engagement protrusion 110 that protrudes in a substantially L shape are also provided at the center and both ends of the inner surface of the front end portion of the bottom wall portion 106 of the case 20. Provided (see FIG. 1). In addition, a fixing lock portion 112 is formed on the bottom wall portion 106 of the case 20, and is attached to another common component such as a fixing engagement portion (not shown) provided in another electrical connection box or the like. Used when fixing.

  As shown in FIGS. 1 to 4, the case 20 having such a configuration is extrapolated from the printed circuit board 12 side to the side connection type connector 18 to which the printed circuit board 12 is assembled. To do. As a result, the front end portions of the upper wall portion 96 and the bottom wall portion 106 of the case 20 are inserted into the guide portions 46 and 56 of the side connection type connector 18, respectively, and the engagement protrusions (not shown) of the case 20 are engaged with the engagement protrusions. The portions 104 and 110 are inserted into the engaging groove portions 50, 60, 48, and 58 of the side connection type connector 18, respectively. Next, the case 20 is pushed further toward the side connection type connector 18, whereby the case 20 is provided with the guide portions 46 and 56 and the engagement groove portions 50, 60, 48 and 58 provided in the side connection type connector 18. The lock claws 44 and 54 provided in the side connection type connector 18 are locked and engaged with the engagement holes 102 and 102 of the engagement frames 98 and 108 formed in the case 20. A case 20 is fixed to the side connection type connector 18. Thereby, in a state where the printed circuit board 12 is accommodated and held in the case 20, the case 20 and the side connection type connector 18 are assembled together to form the electric circuit device 10.

  According to the electrical circuit device 10 of the present embodiment having such a structure, in the sheet-like substrate 78, the pair of printed circuit boards 12, 12 of the printed circuit board 12 perpendicular to both end portions in the width direction of the edge portions 14 thereof. A pair of discarded substrates 80 and 80 are connected to the side edge portions 86 and 86 by a connecting portion 82 so as to be excised. In addition, through holes 88 are provided at both ends in the longitudinal direction of the pair of discarded substrates 80, 80. Thus, in the reflow process, the pair of discarded substrates 80, 80 are mounted on the pair of transport rails 90, 90 so that the protrusions 92 provided on the transport rail 90 fit into the through holes 88 provided in the discarded substrate 80. As a result, the discarded substrate 80 is supported by the transport rail 90, and the substrate 78 including the printed circuit board 12 can be transported to a reflow furnace (not shown). Therefore, it is possible to reduce the manufacturing cost by eliminating a separate component conveying jig. Further, since the printed circuit board 12 can be supported on the transport rail 90 by using a pair of discarded boards 80, 80 provided in advance on the printed circuit board 12, the width of the transport rail is changed and the mounting of the transport jig to the circuit board is performed. Thus, it is possible to eliminate human work and prevent the occurrence of mistakes associated therewith. Therefore, it is possible to improve the efficiency and reliability of the process of automatically mounting the side connection type connector 18 on the printed circuit board 12 by reflow soldering.

  Moreover, since the opening part 24 of the rectangular box-shaped case 20 that accommodates the printed circuit board 12 is covered with the side connection type connector 18, the electric circuit device 10 can be configured with a small number of components. In addition, the distance L2 between the pair of facing side surfaces 94, 94 of the case 20 facing each other in the width direction of the edge 14 of the printed circuit board 12 is L2 in the width direction of the edge 14 of the printed circuit board 12: L1. Therefore, the electric circuit device 10 can be made compact. However, in such a case, there is a restriction that the printed board 12 cannot be made larger, but the printed board 12 is supported on the transport rail 90 by using the discarded board 80 provided on the printed board 12. be able to.

  As mentioned above, although embodiment of this invention was explained in full detail, this invention is not limited by the specific description. For example, in the present embodiment, the side connection type connector 18 is described as an example of the electrical component connection unit. However, in addition to this, the side connection type fuse unit or the electrical component is mounted from above as the electrical component connection unit. The present invention can be similarly applied to a type of electrical component connecting unit.

10: Electrical circuit device, 12: Printed circuit board, 14: Edge portion, 16: Mounting portion, 18: Side connection connector (electrical component connection unit), 20: Case, 22: One side surface, 24: Opening portion, 80: Discarded substrate, 86: Side edge, 90: Transport rail, 94: Opposite side surface

Claims (3)

A method of manufacturing a printed circuit board including an electrical component connection unit,
A pair of discarded substrates supported by the transport rail can be cut out from the mounting portion that extends over substantially the entire length in the width direction of the end edge portion and both side edge portions that are orthogonal to the both end portions in the width direction of the end edge portion. A printed circuit board preparation step of preparing a printed circuit board connected to
A reflow step of transporting the printed circuit board to a reflow furnace by supporting the pair of discarded boards on the transport rail in a state where the electrical component connection unit is mounted on the mounting portion;
An excision step of excising the discarded substrate after the reflow step;
A method for manufacturing a printed circuit board comprising an electrical component connection unit. An electrical circuit device including a printed circuit board in which an electrical component connection unit is mounted by reflow soldering on a mounting portion that extends over substantially the entire length in the width direction of the edge portion,
An electric circuit device having a built-in printed circuit board, wherein the printed circuit board is obtained by the method for producing a printed circuit board comprising the electrical component connecting unit according to claim 1.   The printed circuit board is housed in a rectangular box-shaped case having an opening on one side surface, the opening of the case is covered with the electrical component connecting unit, and the printed circuit board A pair of opposing side surfaces of the case facing each other in the width direction of the edge portion are in the extending direction of both side edges of the printed circuit board with a distance between the facing surfaces slightly larger than the width direction dimension of the edge portion. An electric circuit device incorporating the printed circuit board according to claim 2.

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