JP5601828B2 - Printed wiring board laminate and manufacturing method thereof - Google Patents

Description

  The present invention relates to a printed wiring board laminate in which a plurality of printed wiring boards are connected using connection terminals. Moreover, this invention relates to the manufacturing method of a printed wiring board laminated body.

  Conventionally, various electronic devices have been employed in the electrical system of automobiles, and a plurality of printed wiring boards are used for efficient power supply and signal exchange there. Such a plurality of printed wiring boards are arranged in parallel and spaced apart from each other as described in, for example, Japanese Patent Laid-Open No. 9-63668 (Patent Document 1), and both end portions are inserted into the respective through holes. They are connected to each other by pin-like connection terminals that are soldered together.

  By the way, in such a connection terminal, (i) it can be easily inserted and assembled into each through hole of a plurality of printed wiring boards, and (ii) the positioning of the connection terminals with respect to the printed wiring board is accurate when soldering. It is important to be able to perform well, and (iii) to reliably perform soldering with high reliability.

  However, in the prior art described in Patent Document 1, the end of the connection terminal must be press-fitted and fixed into the through hole of the printed wiring board, and a special device is required for press-fitting, and the work is troublesome. was there. In addition, there is a possibility that peeling of the copper foil circuit in the through hole or the substrate may occur during such press-fitting, and it is difficult to obtain sufficient connection reliability.

  Patent Document 1 also discloses a structure in which one end of a connection terminal is press-fitted into a through hole and the other end is loosely inserted into a through hole of another printed wiring board with a gap. . However, as long as one end of the connection terminal is press-fitted, it goes without saying that the problems associated with the above-mentioned press-fitting structure will occur, and in addition, at the loose insertion site of the other end of the connection terminal, If the gap becomes large, the problem that the positioning accuracy of a plurality of printed wiring boards deteriorates easily occurs, and the connecting terminal is eccentrically located in the through hole, so that a large gap size is unevenly distributed and solder to the through hole. There was also a problem that the rise was not stable and it was difficult to ensure the reliability of soldering.

JP-A-9-63668

  The present invention has been made in the background of the above-described circumstances, and the problem to be solved is that (i) the through holes of a plurality of printed wiring boards are easily inserted and assembled, (ii) A printed wiring board having a novel structure capable of achieving any of the requirements that the connection terminals can be accurately positioned with respect to the printed wiring board during soldering, and (iii) the soldering can be reliably performed with high reliability. The object is to provide a laminate.

  Another object of the present invention is to provide a novel method for producing a printed wiring board laminate using such connection terminals.

A first aspect of the present invention relating to a printed wiring board laminate is a connection terminal in which a plurality of printed wiring boards arranged in parallel and spaced apart from each other are inserted and soldered through through holes provided respectively. The printed wiring board laminates connected to each other, wherein the connection terminal is formed by a wire terminal having a cross section that is loosely inserted into the through hole provided in any of the plurality of printed wiring boards And a locking projection is integrally formed at one end in the length direction of the connection terminal, and the connection terminal is connected to each of the plurality of printed wiring boards from the other end side in the length direction. The locking protrusion is locked to the outer opening edge of the through hole of the printed wiring board that is inserted through the through hole and arranged on one outermost side in the stacking direction. While inserting end position of the serial connection terminal is defined, said plurality of printed circuit board in the connection terminal in at least one of the interpolation position of each through hole toward the inner circumferential surface of the through hole Projecting centering protrusions are integrally formed, and the wire terminals forming the connection terminals are cut to a predetermined length from a metal wire having a conductive metal plating layer deposited over the entire surface. with obtained using cutting wire, the retaining projection and said centering projection for the end portions of the axis-perpendicular direction side surfaces of the cutting wire so as to sandwich the a recess provided crush, axial central portion in the width direction It is characterized by being formed by plastic deformation by forging pressure that protrudes in a perpendicular direction .

  According to the printed wiring board laminate having such a structure, the connection terminals are loosely inserted into any through holes of the plurality of printed wiring boards. Therefore, it can be inserted into the through-hole without requiring a special machine such as press-fitting, and there is little risk of damaging the substrate and the copper foil circuit in the through-hole during insertion. Therefore, (i) the connection terminal can be easily inserted and assembled into each through hole of the plurality of printed wiring boards. Furthermore, since the connection terminals can be inserted from the outermost printed circuit board into the plurality of stacked printed circuit boards at once, excellent assembly workability can be obtained.

Further, the connection terminal can be positioned in the insertion direction by locking the locking projection formed on the connection terminal to the printed circuit board. In addition, the centering protrusion formed on the connection terminal contacts the inner peripheral surface of the through hole in the through hole, whereby the connection terminal can be centered in the through hole in a direction orthogonal to the insertion direction. Accordingly, while the connection terminal is easily inserted into the printed circuit board in the loosely inserted state, at the time of soldering, the position of the connection terminal with respect to the printed circuit board can be changed between the insertion direction of the connection terminal and the direction orthogonal thereto It is possible to position with high accuracy even in the direction of.

Then, by positioning the connection terminal in the center of the through hole with the centering protrusion, uneven distribution of a large gap between the through hole and the connection terminal can be reduced, and soldering can be stabilized. At the same time, each terminal is accurately centered with respect to the through hole, so that the pitch between the plurality of connection terminals can be accurately aligned, and the insulation between the terminals can be improved. As a result, (iii) soldering can be reliably performed with high reliability.
According to the printed wiring board laminate of the present invention, the locking protrusion and the centering protrusion can be easily formed integrally with the connection terminal. In addition, by forming the locking protrusion and centering protrusion by forging, it is possible to leave a plating layer deposited on the surface of the metal wire on the locking protrusion and centering protrusion. Can be ensured, and good solder finish can be realized.

  A second aspect of the present invention relating to a printed wiring board laminate is the one described in the first aspect, in which the locking protrusion protrudes partially on the periphery of the connection terminal.

  If it does in this way, the dimension of a latching protrusion can be made small. As a result, for example, the size of the locking projections is brought close to the size of the lead parts of other electrical components that are surface-mounted on the printed circuit board, and together with the other electrical components, reflow soldering is performed on the printed circuit board in a lump. It can also be fixed. In addition, since the risk of blocking the opening of the through hole over the entire circumference with the locking projection is avoided as in the case where the locking projection is formed over the entire circumference, the solder rise is more reliably performed. You can also

A third aspect of the present invention relating to a printed wiring board laminate is the one described in the second aspect, wherein the locking protrusions are equally spaced and have the same protruding height on the circumference of the connection terminal. Two are formed.

  According to this aspect, since the connection terminal is locked at equal intervals on the circumference with respect to the printed wiring board, the printed wiring board of the connection terminal caused by the locking portion being unevenly distributed on the circumference of the connection terminal As a result, it is possible to reduce the wobbling and the inclination with respect to, and to obtain better positioning accuracy. Further, as will be described later, when the locking protrusion is inserted into the through hole and used as a centering protrusion, more excellent centering accuracy can be obtained.

According to a fourth aspect of the present invention relating to the printed wiring board laminate, the centering protrusion of the connection terminal is at least the other outermost layer in the laminating direction in the one of the first to third aspects. It is formed in the insertion position to the through hole of the printed wiring board arranged on the outside.

  According to this aspect, since the centering protrusion is positioned in the through hole of the outermost printed wiring board, the visual confirmation of the positioning state of the centering protrusion in the through hole can be facilitated. Further, by positioning the connection terminal in the through hole of the outermost printed wiring board, the positioning accuracy of the connection terminal with respect to the printed wiring board by the centering protrusion can be advantageously improved. Particularly preferably, in this embodiment, centering protrusions are provided at the insertion positions of the printed wiring boards arranged on the outermost sides in both the stacking directions into the respective through holes. If it does in this way, the positioning accuracy with respect to the some printed wiring board of a connecting terminal can be improved more.

  According to a fifth aspect of the present invention relating to the printed wiring board laminate, in the one according to any one of the first to fourth aspects, the locking protrusion of the connection terminal is the print of the connection terminal. It has a tapered shape in which the protruding height gradually increases from the front side to the rear side in the insertion direction with respect to the wiring board.

  In this way, the middle of the tapered inclined surface is locked to the outer opening edge of the through hole, and a part of the locking protrusion is inserted into the through hole so that the inside of the through hole is inserted. By protruding toward the peripheral surface, the locking protrusion can be used as a centering protrusion.

The present invention relating to a method for manufacturing a printed wiring board laminate includes a connection terminal in which at least two printed wiring boards arranged in parallel and spaced apart from each other are inserted and soldered into through holes provided respectively. A method of manufacturing a printed wiring board laminate connected to each other, and is formed by wire rod terminals having a cross section that is loosely inserted into the through holes provided in any of the plurality of printed wiring boards. A locking protrusion is integrally formed at one end in the length direction, and a centering protrusion is integrally formed at at least one of the insertion positions of the plurality of printed wiring boards into the through holes. Fixing the connecting terminals with a positioning jig in a state where all of the plurality of printed wiring boards are spaced apart and arranged in parallel. And through each of the through holes in the plurality of printed wiring boards supported by the positioning jig, by inserting the connection terminal from the end opposite to the locking projection, The connection terminal is inserted into the insertion end defined by the engagement of the engagement protrusion with respect to the outer opening edge of the through hole of the printed wiring board disposed on one outermost side in the stacking direction, and A step of projecting the centering protrusion in the connection terminal toward the inner peripheral surface of any through hole of the printed wiring board; and inserting the connection terminal into each through hole of the plurality of printed wiring boards Soldering to each printed wiring board at a site, and further, the step of preparing the connection terminal is applied to the entire surface of the metal wire. A step of depositing a plating layer of a conductive metal I, and obtaining a cutting wire constituting the wire terminals by cutting the metal wire by a predetermined length, both ends of the axis-perpendicular direction side surfaces of the cutting wire Forming the locking projection and the centering projection by plastic deformation by forging pressure by which a hollow portion is provided by crushing the portion and a central portion in the width direction is projected in a direction perpendicular to the axis. To do.

According to the method for manufacturing a printed wiring board laminate according to the present invention, a plurality of printed wiring boards are accurately positioned with a positioning jig in advance, and a connection terminal is connected to each through hole of the plurality of printed wiring boards. It can be inserted at once from the outermost side in the stacking direction. And, since the connection terminals are inserted into all the boards in advance and then soldered, for example, after the connection terminals are soldered and fixed to any of the printed wiring boards, the connection terminals fixed to the printed wiring boards Thus, as in the case of inserting the remaining printed wiring board, it is possible to avoid the possibility that the insertion operation becomes difficult due to variations in the pitch between terminals. Thereby, simplification of an assembly | attachment operation | work can be aimed at. Further, since the connection terminal is loosely inserted into each through hole, there is little possibility of damaging the printed wiring board. Further, the insertion end positions of the connection terminals inserted into the plurality of printed wiring boards are defined by the locking projections, and the connection terminals are centered in the through holes by the centering projections, so that the connection terminals are It becomes possible to position the printed wiring board accurately and efficiently, and the connection terminals can be stably soldered to the printed wiring board. As a result, the pitch between the plurality of connection terminals can be accurately aligned, and the insulation between the terminals can be stably secured.

According to the printed wiring board laminate having the structure according to the present invention, the connection terminals between the printed wiring boards are loosely inserted into the respective through holes. Thereby, while being able to be easily inserted in each through hole, the possibility of damage to the printed wiring board and the copper foil circuit at the time of insertion can be reduced. In addition, the insertion end position of the connection terminal is defined by the locking protrusion, and the connection terminal can be centered in the through hole by the centering protrusion, so that the connection terminal can be accurately positioned with respect to the printed wiring board during soldering. I can do it. As a result, the pitch between the terminals can be accurately aligned, and the insulation between the terminals can be easily and stably ensured. In addition, the positioning of the connection terminal within the through hole with high accuracy suppresses the uneven distribution of the large gap between the through hole and the connection terminal on the circumference and stabilizes the solder rise, thereby ensuring high reliability of soldering. It can be done with certainty.

In addition, according to the method for manufacturing a printed wiring board laminate according to the present invention, a printed wiring board or copper is formed by loosely inserting a connection terminal into each through hole of a plurality of printed wiring boards arranged in a stack with a jig. The possibility of damage to the foil circuit can be reduced. Further, the connection terminals are inserted at a time from the outermost printed wiring board in the stacking direction to a plurality of stacked printed wiring boards, and the connection terminals are soldered in a state of being inserted in all the printed wiring boards in advance. Thus, excellent assembly workability can be obtained. Then, the insertion end position of the connection terminal is defined by the locking projection, and the connection terminal is easily and accurately positioned with respect to each printed wiring board by centering the connection terminal in the through hole by the centering protrusion. Thus, the reliability of the soldering of the connection terminals can be improved, and the pitch between the terminals can be accurately aligned.

The side view of the printed wiring board laminated body as 1st embodiment of this invention. The side view of the connecting terminal used for the printed wiring board laminated body shown in FIG. The side view different from FIG. 2 of the connection terminal shown in FIG. FIG. 4 is an explanatory diagram for explaining a state in which the connection terminal shown in FIG. Explanatory drawing equivalent to A arrow view in FIG. Partial cross-sectional explanatory drawing for demonstrating the manufacturing method of the printed wiring board laminated body according to this invention. The side view of the connecting terminal used for the printed wiring board laminated body as 2nd embodiment of this invention. Sectional explanatory drawing for demonstrating the insertion state to the printed wiring board of the connecting terminal shown in FIG. Partial cross-sectional explanatory drawing for demonstrating the printed wiring board laminated body as 3rd embodiment of this invention.

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

  First, FIG. 1 shows a printed wiring board laminate 10 as a first embodiment of the present invention. The printed wiring board laminate 10 includes a first printed wiring board 12a and a second printed wiring board 12b that are spaced apart from each other in parallel, and the first and second printed wiring boards 12a, Both end portions 18a and 18b of the connection terminal 16 are inserted into the through holes 14 of 12b and soldered. The first and second printed wiring boards 12a and 12b are each formed with a plurality of through holes 14 arranged in a straight line, and the stacked direction of both the printed wiring boards 12a and 12b (the vertical direction in FIG. 1). ), The connection terminal 16 is inserted through a pair of through holes 14, 14 arranged on the same straight line. As a result, the first printed wiring board 12 a and the second printed wiring board 12 b are connected to each other by the plurality of connection terminals 16.

2 and 3 show the connection terminal 16. The connection terminal 16 is inserted through the through holes 14 of the first and second printed wiring boards 12a and 12b from the other end 18b in the length direction (vertical direction in FIGS. 2 and 3). The other end 18b side (the lower side in FIGS. 2 and 3) is the front side in the insertion direction, and the one end portion 18a side (the upper side in FIGS. 2 and 3) is the rear side in the insertion direction. Is done. The connection terminal 16 is a wire terminal formed using the cutting wire 20. The cutting wire 20 is a predetermined length cut of a metal wire having a plating layer made of a conductive metal material such as tin or gold deposited over the entire surface of a base material of a conductive metal material such as copper or iron. Has been formed. Thereby, the yield is improved as compared with the case of punching and forming a metal strip. As the cross-sectional shape of the cutting wire 20, a rectangular shape such as a square or a rectangle, a circular shape including an ellipse, or any other polygonal shape can be appropriately employed. The cutting wire 20 in the present embodiment excludes both end edges of the lengthwise direction (vertical direction in FIGS. 2 and 3) and the formation of locking protrusions 22 and centering protrusions 28 described later, which are tapered. It has a constant square cross-sectional shape over substantially the entire length.

  Further, as will be apparent from FIGS. 4 and 5 to be described later, the through holes 14 of the first and second printed wiring boards 12a and 12b are provided with a constant circular cross section, and the cutting wire 20 is formed as a through wire. By making a square cross section having a diagonal length slightly smaller than the inner diameter dimension of the hole 14, it can be loosely inserted into any of the through holes 14 of the first and second printed wiring boards 12a and 12b. Yes.

  At one end 18a in the length direction of the connection terminal 16 (vertical direction in FIG. 2), a pair of locking projections 22 are provided at positions inserted into the through holes 14 of the first printed wiring board 12a. 22 is integrally formed. These locking protrusions 22 and 22 have the same shape. The locking protrusion 22 is a protrusion protruding outward in the direction perpendicular to the axis of the connection terminal 16 (left and right direction in FIG. 2), and forward of the connection terminal 16 in the insertion direction with respect to the printed wiring boards 12a and 12b. The taper shape has an inclined surface 24 in which the protruding height gradually increases from the (downward in FIG. 2) side to the rear side (upward in FIG. 2). The inclined surface 24 is connected to the side surface 26a (or 26b) of the connection terminal 16 at the front end edge 25 in the insertion direction. As a result, the locking projection 22 has a tapered shape that gradually protrudes from the side surface 26a (or 26b) without a step, and the risk of the front edge 25 being caught when inserted into the through hole 14 is reduced. ing. Further, the width dimension of the inclined surface 24 (the horizontal dimension in FIG. 3) is made smaller than the width dimension (the horizontal dimension in FIG. 3) of the side surface 26a (or the side surface 26b). , Protruding partially on the periphery of the connection terminal 16. Accordingly, the locking projection 22 is formed to be recessed from the side surfaces 26c and 26d on the side different from the side surfaces 26a and 26b, and the locking projection 22 is formed in the width direction of the side surfaces 26a and 26b (left and right direction in FIG. 3). Recessed portions 29 and 29 are formed on both sides, respectively.

  A pair of such locking projections 22 is formed on the side surfaces 26 a and 26 b constituting the pair of opposite sides in the square cross section of the connection terminal 16. Thus, the pair of locking projections 22 and 22 are formed at equal intervals on the circumference of the connection terminal 16 and with the same projection height. The width dimension in the direction orthogonal to the length direction of the connection terminal 16 formed by the front end edges 25 of the pair of locking projections 22, 22 is w1 is one side of the square cross section of the connection terminal 16. And is formed by a rear end edge portion (upper end edge portion in FIG. 2) of the locking projections 22 and 22 in the insertion direction. The width dimension: w2 is slightly larger than the inner diameter dimension of the through hole 14, and more preferably smaller than the outer diameter dimension of the land 27 (see FIG. 4) of the through hole 14.

  Further, a pair of centering protrusions 28 is provided at a position where the other end 18b in the length direction of the connection terminal 16 (vertical direction in FIG. 2) is inserted into the through hole 14 of the second printed wiring board 12b. , 28 are integrally formed. These centering protrusions 28 and 28 have the same shape. The centering protrusion 28 is a protrusion that protrudes outward in the direction perpendicular to the axis of the connection terminal 16 (the left-right direction in FIG. 2). Note that both end portions (upper and lower end portions in FIG. 3) of the centering projection 28 in the insertion direction are tapered surfaces 30 in which the protruding dimension from the side surface 26a (or side surface 26b) gradually increases (or decreases) in the insertion direction. Therefore, the through hole 14 can be more easily inserted and the risk of damaging the through hole 14 is reduced. Further, the width dimension of the centering projection 28 (the horizontal dimension in FIG. 3) is smaller than the width dimension (the horizontal dimension in FIG. 3) of the side surface 26a (or the side surface 26b). Is partially protruded on the circumference of the connection terminal 16. Thereby, also about the centering protrusion 28, the recessed parts 31 and 31 are formed in the both sides of the width direction of the side surfaces 26a and 26b similarly to the latching protrusion 22, respectively.

  A pair of such centering protrusions 28 are formed on the side surfaces 26 a and 26 b of the connection terminal 16 together with the locking protrusions 22 and 22, respectively. Accordingly, the pair of centering protrusions 28 and 28 are formed at equal intervals on the circumference of the connection terminal 16 and with the same protruding height. The width dimension w3 in the direction perpendicular to the length direction of the connection terminal 16 formed by the pair of centering protrusions 28, 28 is made smaller than the inner diameter dimension of the through hole 14.

  These locking projections 22 and centering projections 28 are preferably cut when the cutting wire 20 is forged and plastically deformed partially in the length direction by one press or multiple times of tapping. It is integrally formed with the wire 20. For example, the forging pressure is such that the cutting wire 20 is sandwiched from both sides in the direction perpendicular to the axis, and a die is pressed against each of the side surfaces 26c and 26d so that the cutting wire 20 is partially crushed to partially form a protruding portion in the direction perpendicular to the axis. It is done by doing. In this way, the plating layer deposited on the entire peripheral surface of the cutting wire 20 can be left on the locking protrusion 22 and the centering protrusion 28, and solder wettability can be ensured.

  The connection terminal 16 having such a structure is formed on each of the first printed wiring board 12a and the second printed wiring board 12b that are spaced apart and parallel to each other, and is on the same straight line in the stacking direction. The through-holes 14 and 14 positioned are inserted. The connection terminal 16 has an end 18b opposite to the end 18a on which the locking projection 22 is formed as the front in the insertion direction, with respect to the first printed wiring board 12a located on one outermost side in the stacking direction. The through holes 14 and 14 of the first and second printed wiring boards 12a and 12b are inserted from the outside in the stacking direction. 4 and 5 show the insertion state of the connection terminal 16 into the first and second printed wiring boards 12a and 12b.

As shown in FIGS. 4 and 5, the connection terminal 16 has a width dimension w2 at the rear end edge in the insertion direction of the locking protrusions 22, 22, which is larger than the inner diameter dimension of the through hole 14. The stop protrusions 22 are locked to the outer opening edge 32 of the through hole 14 in the first printed wiring board 12 a in the middle of the inclined surfaces 24. As a result, the insertion end position of the connection terminal 16 is defined, and the locking protrusions 22 and 22 are partially positioned in the state of being inserted into the through hole 14 of the first printed wiring board 12a, and for centering. The protrusions 28 are positioned in an inserted state into the through hole 14 of the second printed wiring board 12b. Further, the connecting terminal 16 has an inner peripheral surface 34 of the through hole 14 of the first printed wiring board 12a and an inner peripheral surface 34 of the through hole 14 of the second printed wiring board 12b, except for the locking projections 22. Both are inserted in a loosely inserted state with a gap. Then, both end portions 18a and 18b of the connection terminal 16 are fixed with solder 36 in a state of being inserted into the through hole 14 of the first printed wiring board 12a and the through hole 14 of the second printed wiring board 12b, respectively. The printed wiring board laminate 10 is formed by electrically connecting the first printed wiring board 12a and the second printed wiring board 12b to each other through the connection terminals 16.

  According to the printed wiring board laminate 10 having such a structure, the connection terminal 16 is loosely inserted into any of the through holes 14 and 14 of the first printed wiring board 12a and the second printed wiring board 12b. Therefore, the insertion into the through hole 14 can be easily performed, and the printed wiring boards 12a and 12b and the copper foil circuit formed thereon are less likely to be damaged during the insertion.

Then, by locking the locking projections 22 and 22 to the outer opening edge 32 of the through hole 14, the connection terminal 16 can be easily and accurately positioned in the insertion direction. At the same time, centering protrusions 28 and 28 formed on the end 18 b of the connection terminal 16 protrude toward the inner peripheral surface 34 of the through hole 14 in the state of being inserted into the through hole 14. Thereby, the end 18b can be centered with respect to the through hole 14 formed in the second printed wiring board 12b, and the connection terminal 16 can be accurately positioned in the direction orthogonal to the insertion direction.

  In particular, in the present embodiment, the locking protrusions 22 and 22 formed on the end portion 18a are locked to the outer opening edge portion 32 of the through hole 14 in the vicinity of the rear end edge portion in the insertion direction. Accordingly, substantially the entire locking projections 22 are inserted into the through hole 14 and protrude toward the inner peripheral surface 34 of the through hole 14. As a result, the locking protrusion 22 can also be used as a centering protrusion, and the centering effect of the end 18a on the through hole 14 formed in the first printed wiring board 12a is also exhibited. It has become. Then, the locking projections 22 and 22 center one end 18a with respect to the first printed wiring board 12a disposed on the outermost side in the stacking direction, and the centering projections 28 and 28 provide the other end. More excellent positioning accuracy by centering the end 18b with respect to the second printed wiring board 12b arranged on the other outermost side in the stacking direction and centering both ends 18a and 18b of the connection terminal 16 respectively. It is possible to get

  As a result, the connection terminal 16 is easily inserted into the first and second printed wiring boards 12a and 12b in a loosely inserted state, and the soldering is performed in the insertion direction and insertion with respect to the printed wiring boards 12a and 12b. Positioning can be accurately performed in any direction orthogonal to the direction. As a result, uneven distribution in the circumferential direction of the gap between the connection terminal 16 and the inner peripheral surface 34 of the through hole 14 can be avoided, and the reliability of soldering can be improved. Can be accurately aligned, and insulation between terminals can be secured.

  In particular, in the present embodiment, the pair of centering protrusions 28 and 28 and the pair of locking protrusions 22 and 22 protrude with the same height in opposite directions, so that the end 18b and The end 18a can be centered with higher accuracy. Further, since the centering protrusions 28 and 28 and the locking protrusions 22 and 22 are partially formed on the periphery of the connection terminal 16, the clearance dimension between the connection terminal 16 and the inner peripheral surface 34 of the through-hole 14. Can be ensured more effectively, and the opening size of the through-hole 14 can be avoided and the opening size can be secured larger, and the soldering can be further improved. In addition, when the solder 36 enters the recesses 29 and 31 formed on both sides of the locking protrusion 22 and the centering protrusion 28, a stronger fixing force can be obtained. Further, since the locking protrusions 22 and 22 are locked to the outer opening edge 32 of the through hole 14 at the rear end edge portion in the insertion direction, and substantially entirely inserted into the through hole 14, The protrusions 22 and 22 prevent the connecting terminal 16 from projecting in the direction perpendicular to the axis, so that the pitch between the terminals is more advantageously secured.

  In addition, the printed wiring board laminated body 10 made into such a structure is suitably manufactured according to the manufacturing method shown below, for example. First, a plurality of connection terminals 16, a first printed wiring board 12a, and a second printed wiring board 12b are prepared. Then, as shown in FIG. 6, the first printed wiring board 12a and the second printed wiring board 12b are set parallel to the positioning jig 40 in a state of being separated from each other, and the first printed wiring board 12a Positioning in a state in which the through hole 14 and the through hole 14 of the second printed wiring board 12b are aligned so as to be positioned on the same straight line in the stacking direction of the printed wiring boards 12a and 12b (vertical direction in FIG. 6) The jig 40 is fixedly supported. In FIG. 6, the first printed wiring board 12a and the second printed wiring board 12b are provided by interposing the insulating plate 41 between the first printed wiring board 12a and the second printed wiring board 12b. They are separated from each other. However, in place of the insulating plate 41, the positioning jig 40 is extended between the first printed wiring board 12a and the second printed wiring board 12b, or the first printed wiring board 12a and the second printed wiring board 12b. The printed wiring board 12b may have different external dimensions and be supported by the positioning jig 40 so that the distance between the printed wiring boards 12a and 12b may be maintained using the positioning jig 40. The first printed wiring board 12a and the second printed wiring board 12b may be aligned by bringing the outer peripheral edge portions 42 and 42 into contact with the positioning jig 40 as shown in FIG. Alternatively, or in addition, as shown in FIG. 6, pilot holes 44 are provided in each of the printed wiring boards 12 a and 12 b, and these pilot holes 44 project from the positioning jig 40. The positioning may be performed by being inserted through the positioning rod 46.

Next, the connection terminal 16 is positioned on the outermost side in the stacking direction (vertical direction in FIG. 6), with the end 18b opposite to the end 18a on which the locking projection 22 is formed being the front in the insertion direction. The surface 48a of the first printed wiring board 12a is inserted through the through hole 14 of the first printed wiring board 12a and the through hole 14 of the second printed wiring board 12b. The engaging protrusions 22 and 22 are engaged with the outer opening edge 32 of the through hole 14 of the first printed wiring board 12a, whereby the insertion end of the connection terminal 16 is defined. As a result, one end 18a of the connection terminal 16 protrudes from the surface 48a of the first printed wiring board 12a located on one outermost side in the stacking direction, and the other end 18b extends in the stacking direction. It protrudes from the surface 48b of the second printed wiring board 12b located on the other outermost side. At the same time, the centering protrusions 28 and 28 provided on the end 18b are projected toward the inner peripheral surface 34 in a state of being inserted into the through hole 14 of the second printed wiring board 12b. When a plurality of connection terminals 16 are used, all the connection terminals 16 are inserted through the first and second printed wiring boards 12a and 12b.

  Subsequently, the insertion portion of the end 18a of the connection terminal 16 into the through hole 14 of the first printed wiring board 12a is soldered by a local flow or robot solder, and the end 18a is soldered to the first printed wiring board. It fixes to 12a. After the soldering of the end portions 18a of all the connection terminals 16 is completed, the first printed wiring board 12a and the second printed wiring board 12b are maintained in a separated state with the insulating plate 41 interposed therebetween. Meanwhile, the second printed wiring board 12b is removed from the positioning jig 40 and reversed so that the insertion portion of the second printed wiring board 12b at the other end 18b into the through hole 14 is similarly inserted into the second printed wiring board 12b by local flow or robot solder. Secure to. Thereby, the printed wiring board laminated body 10 can be obtained.

  According to such a manufacturing method, the connection terminal 16 can be inserted into the through hole 14 of the first printed wiring board 12a and the through hole 14 of the second printed wiring board 12b at a time. Further, since the connection terminal 16 is loosely inserted into any of the through holes 14 and 14, it can be easily inserted without using a special machine or the like such as press-fitting, and the printed wiring boards 12a and 12b and the like can be inserted into these through the insertion. There is little risk of damaging the formed copper foil circuit or the like. As a result, excellent assembly workability can be obtained, and the positioning jig 40 that supports the first and second printed wiring boards 12a and 12b can be simplified.

  Then, since the connection terminals 16 are soldered to both the first printed wiring board 12a and the second printed wiring board 12b in advance, the connection terminals are soldered and fixed to, for example, one of the printed wiring boards. After that, it is difficult to insert the other printed wiring board due to the inclination of each connecting terminal as in the case where the other printed wiring board is inserted into many connecting terminals fixed to the printed wiring board. Therefore, it is possible to easily obtain a state in which a large number of connection terminals 16 are inserted into the plurality of printed wiring boards 12a and 12b. Further, since the connection terminals 16 can be accurately positioned on the printed wiring boards 12a and 12b by the locking protrusions 22 and 22 and the centering protrusions 28 and 28 formed on the connection terminal 16, the reliability of soldering is also improved. In addition, the pitch between the terminals of the large number of connection terminals 16 can be easily and accurately aligned.

  In the present manufacturing method and the printed wiring board laminate 10 formed thereby, the circumferential positions around the central axis of the plurality of connection terminals 16 may be aligned with each other or may be different from each other. . Further, in the present manufacturing method, the connection protruding from the first printed wiring board 12a without inverting the laminated body of the first printed wiring board 12a and the second printed wiring board 12b through which the connection terminals 16 are inserted. The end 18a of the terminal 16 may be soldered by robot solder, and the end 18b of the connection terminal 16 protruding from the second printed wiring board 12b may be soldered by a local flow.

  Next, FIG. 7 shows a connection terminal 60 used in a printed wiring board laminate 62 (see FIG. 8) as a second embodiment of the present invention. In the following description, members and parts having the same structure as in the first embodiment are given the same reference numerals as those in the first embodiment in the drawing, and the description will be appropriately described. Omitted.

  A pair of locking projections 64 and 64 are integrally formed at one end 18 a of the connection terminal 60. These locking protrusions 64 and 64 have the same structure as each other, and in a direction perpendicular to the axis of the connection terminal 60 (left and right direction in FIG. 7) from the side surfaces 26a and 26b which are opposite sides in the square cross section of the connection terminal 60. It has a substantially rectangular plate shape that protrudes. Thereby, the front end edge portion 66 of the locking projection 64 is a flat surface protruding in the direction perpendicular to the axis of the connection terminal 60. The width dimension w4 formed by the pair of locking projections 64, 64 is larger than the inner diameter dimension of the through hole 14 of the first printed wiring board 12a, and more preferably, the land 27 of the through hole 14 is. The outer diameter is made smaller. In addition, it is preferable that the latching protrusion 64 is formed by forging processing, such as press work, similarly to the latching projection 22 in the first embodiment. In addition, a pair of centering projections 28 and 28 are integrally formed on the other end portion 18b as in the first embodiment.

  As shown in FIG. 8, the connection terminal 60 having such a structure has through holes 14 in the first printed wiring board 12a and through holes in the second printed wiring board 12b that are arranged in parallel with each other. 14, the first and second printed wiring boards 12a and 12b are inserted in a loosely inserted state from the outside in the stacking direction (upper side in FIG. 8), and both end portions 18a and 18b are fixed with solder 36, respectively. The

According to the connection terminal 60 in the present embodiment, the insertion protrusion position is defined by locking the locking protrusions 64 and 64 to the outer opening edge 32 of the through hole 14 in the first printed wiring board 12a. Positioning in the insertion direction. At the same time, as in the first embodiment, the centering protrusions 28 and 28 protrude toward the inner peripheral surface 34 of the through hole 14 while being inserted into the through hole 14 of the second printed wiring board 12b. By doing so, the connection terminal 60 can be positioned in a direction orthogonal to the insertion direction.

  As is clear from the present embodiment, the specific shape of the locking projection is not limited. In particular, the locking protrusion 64 in the present embodiment is such that the front end edge 66 of the connection terminal 60 is locked to the outer opening edge 32 of the through hole 14, so that the entire locking protrusion 64 is a through hole. 14 is located outside. Accordingly, the locking protrusions 64 and 64 do not exhibit the centering function, and the connection terminal 60 in this embodiment exhibits the centering function by the centering protrusions 28 and 28 formed on the other end 18b. . As is clear from this, the centering protrusion in the present invention only needs to be formed at at least one of the insertion positions into the through holes of the plurality of printed wiring boards.

  Next, FIG. 9 shows a printed wiring board laminate 70 as a third embodiment of the present invention. In FIG. 9, a connection terminal 72 described later is shown in an outer shape for easy understanding. In the printed wiring board laminate 70, three printed wiring boards, a first printed wiring board 12a, a second printed wiring board 12b, and a third printed wiring board 12c, are spaced apart from each other and arranged in parallel. ing. In FIG. 9, a third printed wiring board 12c is disposed between the first printed wiring board 12a and the second printed wiring board 12b.

And the connection terminal 72 is penetrated by each through-hole 14,14,14 of these 1st-3rd printed wiring boards 12a-12c. The connection terminal 72 is a substantially central portion in the length direction (vertical direction in FIG. 9) that is the insertion position of the third printed wiring board 12c into the through hole 14 in the connection terminal 16 in the first embodiment. In addition, a pair of centering protrusions 28 and 28 are integrally formed.

The connection terminal 72 having such a structure is inserted in the through holes 14, 14, 14 of the first to third printed wiring boards 12 a to 12 c in a loosely inserted state. As a result, the locking protrusions 22 and 22 formed on the end 18a of the connection terminal 72 are locked to the outer opening edge 32 of the through hole 14 of the first printed wiring board 12a, and the connection terminal 72 is While being positioned in the insertion direction, the end 18a is positioned in a direction orthogonal to the insertion direction. On the other hand, the centering protrusions 28 and 28 formed on the end 18b are inserted into the through hole 14 of the second printed wiring board 12b, so that the end 18b is positioned in a direction perpendicular to the insertion direction. In addition, the centering protrusions 28 and 28 formed substantially at the center in the length direction of the connection terminal 72 are inserted into the through holes 14 of the third printed wiring board 12c, so that the length of the connection terminal 72 is increased. The central portion of the direction is positioned in a direction orthogonal to the insertion direction. In addition to the fact that both end portions 18a and 18b of the connection terminal 72 are soldered to the first and second printed wiring boards 12a and 12b, respectively, the substantially central portion in the length direction of the connection terminal 72 is the third portion. The printed wiring board 12c is soldered. Note that the connection terminal 72 is soldered to the first to third printed wiring boards 12a to 12c, for example, after the connection terminal 72 is inserted into the first printed wiring board 12a and soldered, The wiring board 12b is inserted and soldered, and then the third printed wiring board 12c is soldered. Thus, the printed wiring board laminate 70 has a structure in which the first to third printed wiring boards 12a to 12c are electrically connected to each other via the connection terminals 72.

  As is clear from the present embodiment, a printed wiring board laminate can be configured using three or more printed wiring boards. Then, depending on the number of printed wiring boards, centering protrusions can be formed at the insertion positions of the connecting terminals into the through holes of the printed wiring boards. When three or more printed wiring boards are used, connection terminals having different lengths may be mixed and selectively connected from a plurality of printed wiring boards to an arbitrary printed board. For example, in the printed wiring board laminate 70 (see FIG. 9), together with the connecting terminal 72, a connection terminal shorter than the connection terminal 72 is prepared, and among the three printed wiring boards 12a to 12c, Only the first printed wiring board 12a and the second printed wiring board 12c may be connected, or only the second printed wiring board 12c and the third printed wiring board 12c may be connected.

10, 62, 70: Printed wiring board laminate, 12a, b, c: Printed wiring board, 14: Through hole, 16, 60, 72: Connection terminal, 18a, b: End, 20: Cutting wire, 22, 64: locking projection, 28: centering projection, 30: taper surface, 32: outer opening edge, 34: inner circumferential surface, 36: solder, 40: positioning jig

Claims (6)

A plurality of printed wiring boards arranged in parallel and spaced apart from each other are printed wiring board laminates that are connected to each other by connecting terminals that are inserted into and soldered through through holes that are respectively provided. And
The connection terminal is formed by a wire material terminal having a cross section that is loosely inserted into the through hole provided in any of the plurality of printed wiring boards, and at one end in the length direction of the connection terminal. A locking projection is integrally formed, and the connection terminal is inserted into each through hole of each of the plurality of printed wiring boards from the other end side in the length direction, and is arranged on one outermost side in the stacking direction. The insertion end position of the connection terminal is defined by locking the locking protrusion with respect to the outer opening edge of the through hole of the printed wiring board, while the connection terminal has the insertion end position. Centering projections projecting toward the inner peripheral surface of the through hole are integrally formed at at least one of the insertion positions of the plurality of printed wiring boards into the respective through holes, and
The wire terminal forming the connection terminal is obtained by using a cut wire obtained by cutting a metal wire having a conductive metal plating layer applied over the entire surface to a predetermined length, and the locking protrusion. and said centering projection for the end portions of the axis-perpendicular direction side surfaces of the cutting wire so as to sandwich the a recess provided crush, and is formed by plastic deformation by forging projecting the central portion in the width direction in the axis-perpendicular direction A printed wiring board laminate characterized by the above.   The printed wiring board laminate according to claim 1, wherein the locking protrusion partly protrudes on a periphery of the connection terminal. The locking projections, the printed wiring board laminate according to claim 2, which is equally spaced two and in the same protrusion height formation on periphery of the connection terminals. The centering protrusion of the connection terminal is formed at an insertion position into the through hole of the printed wiring board disposed on at least the other outermost side in the stacking direction. The printed wiring board laminate according to 1.   The locking projection of the connection terminal has a tapered shape in which the projection height gradually increases from the front side to the rear side in the insertion direction of the connection terminal with respect to the printed wiring board. The printed wiring board laminate according to any one of the above. At least two printed wiring boards arranged in parallel and spaced apart from each other are connected to each other by connection terminals that are inserted into and soldered through through holes provided in the printed wiring board laminates. A manufacturing method comprising:
It is formed by a wire rod terminal having a cross section that is loosely inserted into the through hole provided in any of the plurality of printed wiring boards, and a locking projection is integrally formed at one end in the length direction. And preparing the connection terminal in which a centering protrusion is integrally formed at at least one of the insertion positions in the through holes of the plurality of printed wiring boards;
In a state where all of the plurality of printed wiring boards are spaced apart from each other and arranged in parallel, the step of fixedly supporting by a positioning jig,
By inserting the connection terminal from the end on the opposite side of the locking projection to each of the through holes in the plurality of printed wiring boards supported by the positioning jig, The connection terminal is inserted into an insertion end defined by the engagement of the engagement protrusion with the outer opening edge of the through hole of the printed wiring board disposed on the outside, and the centering in the connection terminal A step of projecting the projection for projecting toward the inner peripheral surface of the through hole of any one of the printed wiring boards;
Soldering the connection terminal to each printed wiring board at a site where each of the plurality of printed wiring boards is inserted into each through hole.
The step of preparing the connection terminal includes a step of depositing a conductive metal plating layer over the entire surface of the metal wire, and a cutting wire constituting the wire terminal by cutting the metal wire at a predetermined length. And the step of obtaining, the crushing portion by crushing both ends of the both sides of the cutting wire in the direction perpendicular to the axis to provide a recess, and the locking projection and the locking projection by plastic deformation by forging pressure to project the central portion in the width direction in the direction perpendicular to the axis And a step of forming a centering protrusion. A method for manufacturing a printed wiring board laminate, comprising:

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