JP2011253991A - Printed board laminating body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a printed board laminating body of a new structure, capable of precisely positioning a connecting terminal and a printed board while ensuring excellent assembling workability, reducing a size thereof, and improving the visibility of solder wicking.SOLUTION: Between opposite surfaces of two printed boards 12, 14, terminal supporting plates 16a, 16b formed by the same material as the printed board 12 are arranged. A plurality of the connecting terminals 18 arranged across the two printed boards 12, 14 is respectively pressed in a plurality of press-in holes 28 formed on the terminal supporting plates 16a, 16b, and held by the terminal supporting plates 16a, 16b.

Description

  The present invention relates to a printed circuit board laminate in which two printed circuit boards are connected to each other through connection terminals.

  Conventionally, a printed circuit board laminate in which a plurality of printed circuit boards are laminated is used as an internal circuit or the like of an electric connection box mounted on an automobile. In such a printed circuit board laminate, two printed circuit boards are arranged to face each other with a gap therebetween, and both ends of the connection terminals are soldered to the respective through holes of the printed circuit boards so that they are connected to each other. It is structured.

  By the way, in a printed circuit board laminated body, many connection terminals are connected between two printed circuit boards. And since the both ends of each connection terminal must be inserted into the through holes of the respective printed circuit boards, the assembly work of the printed circuit board laminate is time-consuming.

  Thus, for example, Japanese Patent Application Laid-Open No. 2009-26464 (Patent Document 1) discloses a structure in which a plurality of connection terminals are fixed to a terminal support base made of synthetic resin in a penetrating state and assembled together on a printed circuit board. .

  However, since both ends of the connection terminal of the printed circuit board laminate are soldered to the two printed circuit boards, high-precision positioning is required between the connection terminal and both printed circuit boards. However, in the printed circuit board laminate described in Patent Document 1, due to the difference in the coefficient of linear expansion between the synthetic resin terminal support base and the printed circuit board, the terminal support base can be used under the heat of soldering or in a high-temperature environment during vehicle mounting. And the printed circuit board expands and contracts in different sizes. As a result, a displacement occurs between the connection terminal fixed to the terminal support and the printed circuit board. For example, when soldering, one end of each connection terminal is soldered to the through hole of one printed circuit board. Later, it may be difficult to insert the other end into the through hole of the other printed circuit board, or a high temperature in the vehicle may cause displacement between the terminal support base and the printed circuit board, resulting in solder cracks. was there. In order to reduce the risk of solder cracks, Patent Document 1 also proposes that the connection terminals have a crank shape and the displacement is absorbed by deformation of the connection terminals. However, such a structure has a problem in that the shape of the connection terminal is complicated and the manufacturing cost is increased.

  Moreover, in the printed circuit board laminated body of patent document 1, in order to ensure the holding force of a connection terminal with respect to the thermal deformation of a terminal support stand, it is necessary to form a terminal support stand thickly. For this reason, the terminal support base is increased in size, and there is a problem that the terminal support base hinders the increase in the size of the printed circuit board laminate and the visibility of solder rise at the connection terminals.

JP 2009-26464 A

  The present invention has been made in the background of the above-mentioned circumstances, and the solution to the problem is that it is possible to position the connection terminal and the printed circuit board with high accuracy while ensuring excellent assembly workability, as well as miniaturization and soldering. An object of the present invention is to provide a printed circuit board laminate having a novel structure capable of improving the visibility of rising.

  According to the first aspect of the present invention, a plurality of connection terminals are disposed across two printed circuit boards that are opposed to each other with a gap therebetween, and both ends of each connection terminal are connected to the two terminals. In a printed circuit board laminate that is inserted through the through holes of the printed circuit boards and soldered, a terminal support plate made of the same material as the printed circuit board is disposed between the opposing surfaces of the two printed circuit boards. The plurality of connection terminals are held in the terminal support plate by being press-fitted into the plurality of press-fitting holes formed in the terminal support plate in a penetrating manner, respectively. Features.

  According to the present invention, the plurality of connection terminals for connecting the two printed boards to each other are in a connected state fixed to the terminal support plate. As a result, a plurality of connection terminals can be handled integrally and can be simultaneously inserted through the through holes of the printed circuit board. As a result, the assembly efficiency can be improved.

  In particular, since the terminal support plate is formed of the same material as the printed board, it has a linear expansion coefficient equal to that of the printed board. Therefore, for example, when the printed circuit board thermally expands due to heat at the time of soldering, the terminal support plate also expands at the same linear expansion coefficient as the printed circuit board, so that the through hole of the printed circuit board and the press-fitting hole of the terminal support plate Can be reduced. As a result, the connection terminal and the two printed circuit boards can be accurately positioned to suppress the inclination of the connection terminal, and both ends of the connection terminal can be easily inserted into the through holes of the two printed circuit boards. Similarly, for example, the terminal support plate and the printed circuit board expand and contract at the same linear expansion coefficient even with respect to temperature changes when the vehicle is mounted, so that the displacement between the press-fitting hole and the through hole is reduced. The risk of solder cracks can be reduced. Further, since the risk of displacement between the press-fitting hole and the through hole is reduced, it is not necessary to make the connection terminal a complicated bent shape such as a crank shape in order to absorb these displacements. Thereby, the shape of a connection terminal can be made into a simple shape, and reduction of manufacturing efficiency and manufacturing cost can be aimed at.

  Furthermore, the material of the printed circuit board in which the terminal support plate is made of the same material is generally a hard material such as a paper base phenolic resin or a glass cloth base epoxy resin. Therefore, it is possible to effectively secure the holding force of the connection terminal with the thin terminal support plate without increasing the thickness, such as a base made of synthetic resin. As a result, visual confirmation of the soldered portion of the connection terminal can be facilitated, and the printed circuit board laminate can be reduced in size.

  In the present invention, the “terminal support plate formed of the same material as the printed board” may be formed of the same material as both of the two printed boards, or the same material as at least one of the printed boards. It may be formed by. The terminal support plate may be prepared separately from two printed circuit boards. Preferably, as the second aspect of the present invention, the terminal support plate is the one described in the first aspect. However, what is formed from the waste end of the printed circuit board is employed.

  The discard end portion in this aspect refers to a so-called discard substrate or the like that is provided at an end portion of a printed board for use as a pinch margin for a mounting machine and is cut off and discarded after component mounting. According to this aspect, by forming the terminal support plate by effectively using the waste material, it is possible to reduce waste and reduce manufacturing costs. Furthermore, since the terminal support plate is formed of the same material as that of the printed board, it is possible to avoid variation in composition among individuals when the printed board and the terminal support plate are separately formed. Thereby, the positioning state of the through hole and the press-fit hole when the printed circuit board and the terminal support plate are thermally expanded can be maintained with higher accuracy.

  According to a third aspect of the present invention, in the first or second aspect, the connection terminal has a linear shape.

  As described above, according to the present invention, even when the terminal support plate and the printed circuit board are thermally expanded or contracted, the positioning state of the press-fitting hole and the through hole can be accurately maintained. As a result, it is not necessary to make the connection terminal a complicated bent shape such as a crank shape in order to absorb the displacement between the press-fitting hole and the through hole. As a result, it is possible to make the connection terminals into a simple linear shape while ensuring the ease of insertion into the through holes and the effect of reducing solder cracks, thereby improving the manufacturing efficiency and reducing the manufacturing cost.

  According to the present invention, a plurality of connection terminals whose both ends are inserted into through-holes of two printed circuit boards are press-fitted into the press-fitting holes of the terminal support plate formed of the same material as the printed circuit board and connected to each other. . Thereby, a some connection terminal can be handled integrally and the outstanding assembly workability | operativity can be acquired. Furthermore, since the terminal support plate and the printed circuit board are thermally deformed at the same linear expansion coefficient, the displacement between the press-fitting hole and the through hole can be reduced, and the connection terminal can be easily inserted into the through hole. At the same time, it is possible to reduce the risk of cracks in the soldering portions of the connection terminals. In addition, since the terminal support plate is formed of a hard material and the holding power of the connection terminal can be secured with a small thickness, it is possible to improve the visibility of the soldered portion and reduce the size of the printed circuit board laminate. I can do it.

The perspective view of the printed circuit board laminated body as one Embodiment of this invention. The side view and principal part enlarged view of the printed circuit board laminated body shown in FIG. The perspective view which shows the state before the discard end part is cut | disconnected of the printed circuit board which comprises the printed circuit board laminated body shown in FIG. 1, and a terminal support plate. The front view of the connecting terminal which comprises the printed circuit board laminated body shown in FIG. The perspective view for demonstrating the assembly process of the printed circuit board laminated body shown in FIG.

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

  First, FIG. 1 and FIG. 2 show a printed circuit board laminate 10 as one embodiment of the present invention. In the printed board laminate 10, the first printed board 12 and the second printed board 14 are opposed to each other with a gap therebetween, and both the printed boards 12 and 14 are fixed to the terminal support plates 16 a and 16 b. A plurality of connection terminals 18 are connected to each other.

  Both the first printed circuit board 12 and the second printed circuit board 14 are hard rigid boards. These printed boards 12 and 14 are conventionally known, for example, paper base phenol resin, glass cloth base epoxy resin, polyimide as resin, bismaleimide triazine resin (BT resin), allylated polyphenylene ether (A-PPE). Glass cloth base material heat-resistant resin using a resin) or the like. The first printed circuit board 12 and the second printed circuit board 14 in the present embodiment are formed from the same material.

  As shown also in FIG. 3, the first printed circuit board 12 has a substantially longitudinal rectangular plate shape. A plurality of through holes 20 are provided at both ends in the width direction of the first printed circuit board 12 so as to be arranged in a line at predetermined intervals in the longitudinal direction of the first printed circuit board 12. One through hole row 22a and a second through hole row 22b are formed. Note that the through holes 20 constituting the through hole rows 22a and 22b have the same circular shape. These through holes 20 are electrically connected to a printed wiring (not shown) formed on the first printed circuit board 12. Further, the first printed board 12 is provided with through holes 20 through which board terminals (not shown) are inserted at appropriate positions as necessary.

  As is conventionally known, the first printed circuit board 12 is formed by grooving or the like in the central portion of the pre-shaped substrate 23 to set an outer shape, and then being separated from the pre-shaped substrate 23. On the other hand, the outer peripheral portion of the pre-shaped substrate 23 left after the first printed circuit board 12 is cut off is discarded as the discard end portion 24. In the present embodiment, the first terminal support plate 16a and the second terminal support plate 16b are formed in a portion located outside the long side of the first printed circuit board 12 in the disposal end portion 24. Yes. As is clear from this, the first terminal support plate 16a and the second terminal support plate 16b are cut out from the same pre-shaped substrate 23 as the first printed circuit board 12, and the first printed board It is made of the same material as the substrate 12.

  Since the first terminal support plate 16a and the second terminal support plate 16b have substantially the same structure, the first terminal support plate 16a will be described. The first terminal support plate 16 a has an elongated plate shape and has the same thickness as the first printed circuit board 12. The first terminal support plate 16a has a plurality of press-fitting holes 28 at the same pitch as the through holes 20 of the first through hole row 22a in the first printed circuit board 12. It penetrates in a straight line in the longitudinal direction. The number of press-fit holes 28 in the first terminal support plate 16a is the same as the number of the through-holes 20 in the first through-hole row 22a, while the number of press-fit holes 28 in the second terminal support plate 16b is The number of through holes 20 in the second through hole row 22b is smaller. The press-fitting hole 28 is a circular through hole, and has a circular shape slightly smaller than a circumscribed circle having a square cross section of the connection terminal 18 to be described later so that the connection terminal 18 can be press-fitted and fixed.

  In addition, the first terminal support plate 16a and the second terminal support plate 16b are connected portions formed by leaving the waste end portion 24 between the first printed circuit board 12 at both longitudinal ends. 30, the first printed circuit board 12 is connected to the edge of the long side. Thus, the first printed circuit board 12 is cut out from the pre-shaped substrate 23 in a state where the first terminal support plate 16a and the second terminal support plate 16b are connected.

  On the other hand, as shown in FIGS. 1 and 2, the second printed circuit board 14 has a width dimension substantially equal to that of the first printed circuit board 12 and a smaller longitudinal dimension than the first printed circuit board 12. It has a substantially longitudinal rectangular plate shape. Then, at both ends in the width direction of the second printed circuit board 14, a first through hole array 32a similar to the first through hole array 22a and the second through hole array 22b in the first printed circuit board 12, and Second through hole rows 32b are respectively formed.

  Next, FIG. 4 shows the connection terminal 18. The connection terminal 18 is formed, for example, by cutting a metal wire with a plating layer made of a metal material such as tin or gold to a predetermined length over the entire surface of a base material of a metal material such as copper or iron. Has been. The connecting terminal 18 extends over substantially the entire length excluding both end edges in the lengthwise direction that are tapered and the formation portions of the support plate side locking projections 34 and 34 and the substrate side locking projections 38 and 38 to be described later. Thus, it has a certain square cross-sectional shape and a linearly extending shape. A pair of support plate side locking projections 34 are formed at a substantially central portion of the connection terminal 18 in the length direction (vertical direction in FIG. 4). The support plate side locking protrusions 34 and 34 are substantially rectangular protrusions protruding on both sides orthogonal to the length direction of the connection terminal 18, and are integrally formed with the connection terminal 18 by crushing or the like. Furthermore, a pair of board side latching protrusions 38 and 38 are formed at positions separated from the support plate side latching projections 34 and 34 toward the one end 36a side in the length direction of the connection terminal 18. Yes. The board side latching protrusions 38 and 38 have the same shape as the support plate side latching protrusions 34 and 34.

  As shown in FIG. 5, the connection terminals 18 are press-fitted into the press-fit holes 28 of the first terminal support plate 16a and the second terminal support plate 16b connected to the first printed circuit board 12, respectively. And fixed in a penetrating state. The connection terminal 18 is inserted into the press-fitting hole 28 from the end 36b on the side where the board side locking projections 38, 38 are not provided, and the support plate side locking projections 34, 34 are the first terminal support. The amount of insertion is defined by contacting the plate 16a (or the second terminal support plate 16b). Thereby, the some connecting terminal 18 is mutually connected by the 1st terminal support plate 16a or the 2nd terminal support plate 16b. Needless to say, the connection terminals 18 do not necessarily have to be inserted through all the press-fitting holes 28, and the number of connection terminals 18 can be arbitrarily set.

  Subsequently, the first terminal support plate 16a and the second terminal support plate 16b, to which the connection terminal 18 is press-fitted and fixed, are separated from the first printed circuit board 12 by cutting the connecting portion 30, and are not illustrated. Set on a jig. The first terminal support plate 16a and the second terminal support plate 16b are inserted into the jig from the end 36a side of the connection terminal 18 and set, so that the end of the connection terminal 18 is set. 36b protrudes from the jig. Then, the first printed circuit board 12 is overlaid on the first terminal support plate 16a and the second terminal support plate 16b. Thus, the end portions 36b of the connection terminals 18 fixed to the first terminal support plate 16a are inserted into the through holes 20 of the first through hole row 22a in the first printed circuit board 12, and the first The end portions 36b of the connection terminals 18 fixed to the second terminal support plate 16b are inserted into the through holes 20 of the second through hole row 22b. Then, the first printed circuit board 12 is removed from the jig in a state where the end portion 36b of the connection terminal 18 is inserted into the through hole 20, and the end portion 36b of the connection terminal 18 is soldered. The connection terminal 18 protrudes from the first printed circuit board 12.

  Subsequently, the second printed circuit board 14 is superimposed on the first printed circuit board 12. As a result, the end portion 36a of the connection terminal 18 fixed to the first terminal support plate 16a and the end portion 36a of the connection terminal 18 fixed to the second terminal support plate 16b are connected to the second printed circuit board 14. The through holes 20 of the first through hole row 32a and the second through hole row 32b are respectively inserted. Note that the second printed circuit board 14 is in contact with the board-side latching protrusion 38 of the connection terminal 18 so that the insertion amount is defined. Then, the end portion 36 a of the connection terminal 18 inserted through the through hole 20 of the second printed circuit board 14 is soldered and fixed to the second printed circuit board 14.

  As a result, the first printed circuit board 12 and the second printed circuit board 14 are opposed to each other substantially in parallel with a gap therebetween. At the same time, the first terminal support plate 16 a and the second terminal support plate 16 b are disposed at a substantially intermediate portion between the opposing surfaces of the first printed circuit board 12 and the second printed circuit board 14. A plurality of connection terminals 18 fixed to each of the first terminal support plate 16 a and the second terminal support plate 16 b are disposed across the first printed board 12 and the second printed board 14. Then, a printed wiring (not shown) provided on the first printed board 12 and a printed wiring (not shown) provided on the second printed board 14 are electrically connected to each other via the connection terminal 18.

  According to the printed circuit board laminate 10 having such a structure, a plurality of connection terminals 18 can be fixed to the first terminal support plate 16a and the second terminal support plate 16b and handled integrally. The first printed board 12 can be efficiently inserted into the through hole 20.

  The first terminal support plate 16 a and the second terminal support plate 16 b are formed of the same material as the first printed circuit board 12. As a result, when the first printed circuit board 12 is thermally expanded or contracted due to high temperature during soldering or in-vehicle, the first terminal support plate 16a and the second terminal support plate 16b are Thermal expansion and contraction are performed at the same linear expansion coefficient as that of the substrate 12. Thereby, when soldering the connection terminal 18 to the first printed circuit board 12, the relative positions of the press-fitting holes 28 of the terminal support plates 16a and 16b and the through holes 20 of the first printed circuit board 12 are determined. 16b and the first printed circuit board 12 can be maintained on the same straight line in the stacking direction (vertical direction in FIG. 2). As a result, the inclination of the connection terminal 18 can be suppressed, and the connection terminal 18 can be easily and reliably inserted into each through hole 20 of the second printed circuit board 14. Furthermore, in the present embodiment, since the material of the second printed circuit board 14 is the same as that of the first printed circuit board 12, the material of the terminal support plates 16a and 16b is the same as that of the second printed circuit board 14. It is the same thing. As a result, the relative positions of the through holes 20 and 20 and the press-fitting holes 28 of both printed circuit boards 12 and 14 with respect to the thermal expansion and contraction of both printed circuit boards 12 and 14 due to soldering and heat generated when the vehicle is mounted are set to both prints. The substrates 12 and 14 can be maintained on the same straight line in the stacking direction. As a result, it is possible to more effectively prevent the connection terminal 18 from being inclined and the occurrence of solder cracks resulting therefrom.

  In addition, the terminal support plates 16a and 16b in the present embodiment are formed of the same material as that of the first printed circuit board 12 by being formed from the unshaped substrate 23 together with the first printed circuit board 12. Thereby, the possibility of variation in composition among individuals as in the case where the terminal support plates 16a and 16b are formed separately from the first printed circuit board 12 can be avoided, and the thermal deformation of the first printed circuit board 12 can be avoided. Thus, the relative position between the press-fit hole 28 and the through hole 20 can be maintained at a higher level.

  Since the relative positions of the through holes 20 and the press-fit holes 28 can be maintained at a high level during the thermal deformation of the first and second printed circuit boards 12 and 14, the connection terminals 18 are connected to the through-holes 20 and the press-fit holes 28. It is not necessary to use a complicated bent shape or the like that can absorb the mutual displacement. Thereby, the connection terminal 18 can be made into a simple linear shape, and reduction of manufacturing cost can be aimed at.

  Further, the first terminal support plate 16 a and the second terminal support plate 16 b are formed using the disposal end portion 24 of the pre-shaped substrate 23 that forms the first printed circuit board 12. The disposal end portion 24 is a so-called disposal substrate that is normally discarded after the first printed circuit board 12 is shaped. According to this embodiment, the disposal end portion 24 extends from the first terminal support plate 16a and the second terminal support plate 16a. By forming the terminal support plate 16b, it is possible to effectively use the waste material and to make it unnecessary to separately prepare a resin pedestal or the like, thereby reducing the manufacturing cost. Furthermore, by forming the first terminal support plate 16a and the second terminal support plate 16b from the same pre-shaped substrate 23 as the first printed circuit board 12, for example, the press-fitting hole 28 is formed in the first printed circuit board 12. The through hole 20 is formed in the same process, and the insertion of the connection terminal 18 into the press-fitting hole 28 is the same as the insertion of the board terminal (not shown) inserted into the through hole 20 of the first printed circuit board 12. It can also be performed efficiently in the process.

  Furthermore, since the first and second terminal support plates 16a and 16b are formed of the same hard material as that of the first printed circuit board 12, the synthetic resin is obtained while effectively securing the holding force of the connection terminals 18. The thickness and width can be made smaller than those of the above. As a result, the first printed circuit board 12 and the second printed circuit board 14 are brought closer to each other to reduce the thickness of the printed circuit board laminate 10, and the first and second terminal support plates 16a, 16b and the first printed circuit board stack 10 are made thinner. A large separation distance from the printed circuit board 12 and the second printed circuit board 14 can be secured, and the visibility of the soldered portion of the connection terminal 18 can be improved.

  As mentioned above, although embodiment of this invention was explained in full detail, this invention is not limited by the specific description. For example, the terminal support plate is not necessarily formed of the same material as both of the two printed boards. For example, the two printed boards are formed of different materials, and the terminal support plate is formed of the two printed boards. It may be formed of the same material as any one of the substrates. Moreover, in the said embodiment, although the terminal support plate was formed from the discard board | substrate of one printed circuit board, you may form a terminal support board separately from a printed circuit board, for example.

  Further, the number and specific shape of the terminal support plate are not limited to those of the above embodiment. For example, one terminal support plate may be provided, or three or more terminal support plates may be provided. Moreover, you may form a press-fit hole in a terminal support plate in multiple rows.

  Furthermore, the connection terminals of the embodiment are merely examples, and for example, the support plate side locking protrusions 34 and 34 and the substrate side locking protrusions 38 and 38 in the embodiment are not necessarily required. In addition, the connection terminals are not necessarily limited to a straight line shape, and various shapes can be used as necessary to prevent the displacement between the through hole of the printed circuit board and the press-fitting hole of the terminal support plate to a higher degree. It can be adopted.

10: Printed circuit board laminate, 12: First printed circuit board, 14: Second printed circuit board, 16a: First terminal support plate, 16b: Second terminal support plate, 18: Connection terminal, 20: Through hole , 24: waste end, 28: press-fit hole, 36a, b: end (connection terminal)

Claims (3)

A plurality of connection terminals are disposed across two printed circuit boards that are opposed to each other with a gap therebetween, and both end portions of each connection terminal are respectively in through holes of the two printed circuit boards. In the printed circuit board laminate that is inserted and soldered,
A terminal support plate made of the same material as the printed circuit board is disposed between the opposing surfaces of the two printed circuit boards, and the plurality of connection terminals are inserted into a plurality of press-fitting holes formed in the terminal support plate. The printed circuit board laminate, wherein the plurality of connection terminals are held by the terminal support plate by being press-fitted in a penetrating state.   The printed circuit board laminate according to claim 1, wherein the terminal support plate is formed from a discarded end portion of the printed circuit board.   The printed circuit board laminate according to claim 1, wherein the connection terminal has a linear shape.

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