JP2015060743A - Printed circuit board with card edge connection and connection structure of card edge connection - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a printed circuit board with a card edge connection of novel structure capable of enhancing connection reliability, and to provide a novel connection structure of card edge connection which allows for further compaction and weight reduction.SOLUTION: A connection terminal 18 constituting a card edge connection 10 provided at the outer peripheral part 16 of a substrate 14 is formed by bonding both ends 22a, 22b to the substrate 14 while floating the central part 28 of a strip bonding wire 20 from the substrate 14.

Description

  The present invention relates to a printed circuit board in which a card edge connection portion is provided on an outer peripheral portion of a substrate, and a card edge connection portion connection structure including a card edge connection portion and a counterpart terminal connected to the card edge connection portion.

  2. Description of the Related Art Conventionally, a printed circuit board having a card edge connecting portion as described in, for example, Japanese Patent Application Laid-Open No. 2010-67668 (Patent Document 1) is known. The card edge connection portion has a structure in which a plurality of connection terminals are arranged in parallel on the outer peripheral portion of the substrate.

  By the way, as shown in Patent Document 1, the conventional card edge connection portion has a connection terminal formed by exposing printed wiring provided on a printed circuit board on the surface. Then, the counterpart terminal is brought into contact with the connection terminal by sandwiching the printed board, and the connection terminal and the counterpart terminal are electrically connected.

  However, in such a structure, since the printed circuit board is sandwiched between the mating terminals, there is a problem in that the circuit board bends and deforms over time, and the contact pressure between the connection terminal and the mating terminal decreases. . Therefore, when applying to the thing which a vibration is always exerted like a motor vehicle etc., the location which can be applied was very limited.

  Further, the counterpart terminal has a spring shape that sandwiches the printed circuit board in order to ensure contact pressure with the connection terminal of the card edge connection portion. For this reason, there has been a problem that the counterpart terminal becomes large, and the connection structure of the card edge connection portion including the counterpart terminal is increased in size and weight.

JP 2010-67668 A

  The present invention has been made in the background of the above-mentioned circumstances, and a solution to the problem is to provide a printed circuit board having a card edge connection portion having a novel structure capable of improving connection reliability. There is. Another object of the present invention is to provide a novel card edge connection portion connection structure that can be further reduced in size and weight.

  A first aspect of the present invention relating to a printed circuit board having a card edge connection portion is that a strip-shaped bonding wire is centered in a printed circuit board having a card edge connection portion in which a plurality of connection terminals are arranged in parallel on the outer periphery of the substrate The connection terminal is formed by fixing both ends to the substrate in a state where the portion is floated from the substrate.

  In the printed circuit board of the present invention, the connection terminal of the card edge connection part is formed of a bonding wire whose center is lifted from the substrate. Thereby, spring property can be provided to the connection terminal on the board side, the contact pressure with the counterpart terminal can be effectively ensured, and the connection reliability can be improved. And the card edge connection part excellent in connection reliability can be formed in low cost by simple structure called a bonding wire.

  Furthermore, since the connection terminal on the board side has a spring property, it is not necessary to sandwich the printed board with the counterpart terminal. As a result, it is possible to make the mating terminal into a simple shape such as a tab shape that does not have springiness, and it is possible to reduce the manufacturing cost of the mating terminal, and to reduce the size and weight.

  The card edge connecting portion is not limited to one side of the outer peripheral portion of the substrate, and may be provided on a plurality of sides. For example, the card edge connecting portion provided on one side of the outer peripheral portion can be connected to the card edge connector provided on another substrate, and the card edge connecting portion provided on the other side is provided on the end of the electric wire. It may be possible to connect to a connector.

  A second aspect of the present invention relating to a printed circuit board provided with a card edge connecting portion is the one described in the first aspect, wherein a resin cover is provided on the outer peripheral portion of the substrate, and the resin cover The terminal insertion hole corresponding to each of the connection terminals is formed, the terminal insertion hole includes an insertion portion that inserts a counterpart terminal that contacts the connection terminal, and the central portion of the connection terminal. An accommodation portion is formed which accommodates and communicates with the insertion portion and positions the central portion within the insertion portion.

  According to this aspect, since the central portion of the bonding wire is positioned in the insertion portion through the terminal insertion hole accommodating portion, the counterpart terminal is reliably brought into contact with the connection terminal by guiding the counterpart terminal through the insertion portion. be able to.

  A third aspect of the present invention relating to a printed circuit board provided with a card edge connection portion is the one described in the second aspect, wherein a front end side of the insertion terminal in the insertion direction is an end surface of the resin cover. It is the one that is opened.

  According to this aspect, the insertion state of the counterpart terminal is visually confirmed from the opening of the end face of the resin cover, or the current is supplied to the counterpart terminal by inserting an electrode from the opening of the end face of the resin cover, for example. can do. More preferably, at the insertion end position of the counterpart terminal, the leading edge of the counterpart terminal is positioned on the end surface of the resin cover. In this way, it is possible to easily find a poor insertion depending on whether the tip edge of the counterpart terminal has reached the end surface of the resin cover.

  According to a fourth aspect of the present invention relating to a printed circuit board provided with a card edge connection portion, the connection terminal includes a plurality of the bonding wires arranged in parallel in the one described in any one of the first to third aspects. Is formed.

  According to this aspect, a wide connection terminal can be easily formed according to the current carrying capacity required for the connection terminal, the width dimension of the counterpart terminal, and the like. Of course, the number of bonding wires arranged in parallel is not limited at all. A plurality of connection terminals constituting one card edge connection part may be formed with a different number of bonding wires.

  According to a fifth aspect of the present invention relating to a printed board having a card edge connection portion, in the one described in any one of the first to fourth aspects, the bonding wire constituting the connection terminal is connected to the substrate. Bonding wires extending inward are connected.

  In this aspect, the degree of freedom of circuit connection of the connection terminals can be improved by connecting a plurality of bonding wires in series. For example, a bonding wire connected to a bonding wire constituting a connection terminal can be used as a jumper wire. Further, since the bonding wires are connected in the length direction, the bonding wires can be easily formed only by continuing the bonding.

  A sixth aspect of the present invention relating to a printed circuit board provided with a card edge connection portion is the one described in any one of the first to fifth aspects, wherein the connection terminals are formed on both surfaces of the board. It is what.

  According to this aspect, a larger number of electrodes can be provided by forming connection terminals on both surfaces of the substrate. That is, since it is not necessary to sandwich the substrate with the counterpart terminal, it is possible to provide connection terminals that are independent from each other on both sides of the substrate, and the connection terminals on both sides can be connected to different counterpart terminals.

  The first aspect of the present invention relating to the connection structure of the card edge connection portion is a connection structure of a card edge connection portion in which a plurality of connection terminals are arranged in parallel on the outer peripheral portion of the substrate, and as the card edge connection portion, The card edge connection part according to any one of the first to sixth aspects relating to the printed circuit board having the card edge connection part is used, and the mating terminal connected to the connection terminal of the card edge connection part is a flat tab The other terminal is connected to the central portion of the connection terminal so as to be connected.

  According to the card edge connection portion of the present invention, spring property is imparted to the connection terminal on the board side. Therefore, it is possible to make the mating terminal into a simple tab shape while ensuring the contact pressure. As a result, the entire connection structure including the card edge connection part and the counterpart terminal can be reduced in size and weight.

  The second aspect of the present invention relating to the connection structure of the card edge connection portion is the one described in the first aspect, wherein the counterpart terminal is formed with a contact protrusion protruding on a contact surface with the connection terminal. It is what has been.

  In this aspect, the contact pressure can be increased by pressing the connection terminal with the contact protrusion of the counterpart terminal. Thereby, an other party terminal can be made to contact with the connection terminal of a card edge connection part more reliably.

  In the present invention relating to a printed circuit board having a card edge connection portion, a connection terminal is formed by a bonding wire having a central portion floating from the substrate. Thereby, even when a board | substrate carries out a bending deformation etc., the contact pressure with an other party terminal can be ensured with the connection terminal by a board | substrate side, and the more excellent connection reliability can be acquired. And according to this invention regarding the connection structure of a card edge connection part, the further size reduction and weight reduction of a connection structure can be achieved by making an other party terminal into a simple tab shape.

The perspective view of the printed circuit board provided with the card edge connection part as 1st embodiment. The disassembled perspective view of the printed circuit board shown in FIG. The principal part enlarged view of FIG. The perspective view of the lower surface side of a resin cover. VV sectional drawing of FIG. The perspective view of the principal part of the other party terminal as 1st embodiment. Sectional drawing which shows the connection state of the other party terminal in FIG. The perspective view of the principal part of the printed circuit board provided with the card edge connection part as 2nd embodiment. FIG. 9 is a partial cross-sectional view of the resin cover mounted state of FIG. 8. The perspective view of the printed circuit board provided with the card edge connection part as 3rd embodiment.

  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 12 having a card edge connection portion 10 that constitutes a card edge connection portion connection structure as a first embodiment of the present invention. The printed circuit board 12 has a structure in which printed wiring is formed on a long rectangular substrate 14.

  In the outer peripheral portion 16 of the printed circuit board 12, a card edge connecting portion 10 is provided on one side extending in the longitudinal direction. As shown in FIG. 2, in the card edge connection portion 10, a plurality of connection terminals 18 are arranged in parallel at an appropriate interval along the extending direction of the outer peripheral portion 16 on the outer peripheral portion 16 of the substrate 14. In the following description, the connection terminals 18 and the bonding wires 20 and the like to be described later will be described with reference numerals to the connection terminals 18a, 18b,.

  As shown in FIG. 3 in an enlarged manner, the connection terminal 18 is formed by a band-like bonding wire 20 made of copper alloy, aluminum, or the like that extends with a rectangular cross section having an appropriate width. The bonding wire 20 is provided such that the length direction from one end 22 a to the other end 22 b extends perpendicular to the extending direction of the outer peripheral portion 16. Both end portions 22a and 22b of the bonding wire 20 are fixed to the printed wiring 26 exposed on the surface 24 of the substrate 14 by, for example, ultrasonic welding, resistance welding, soldering or adhesion. Further, the bonding wire 20 has an arch shape in which the central portion 28 in the length direction is floated from the surface 24 of the substrate 14 and is separated from the surface 24 at the central portion 28.

  In addition, the number of the bonding wires 20 constituting one connection terminal 18 may be any number depending on the width dimension of the tab terminal 70 as a counterpart terminal to be connected, which will be described later. For example, the connection terminal 18a shown in FIG. 3 is formed of one bonding wire 20, while the connection terminal 18b is formed of two bonding wires 20 arranged in parallel. The printed wiring 26 provided with the connection terminal 18b is formed with a width dimension capable of fixing the two bonding wires 20 arranged in parallel. In addition, when the width dimension of the tab terminal 70 mentioned later is still larger, three or more bonding wires 20 may be arranged in parallel to form one connection terminal 18. A plurality of such connection terminals 18 are arranged in parallel along the outer peripheral portion 16 of the substrate 14 at an appropriate interval, whereby the card edge connection portion 10 is formed.

  Further, as shown in FIG. 2, a resin cover 30 is provided on the card edge connection portion 10. The resin cover 30 is a longitudinal member formed from a synthetic resin. In addition, although the resin cover 30 of this embodiment is made into the length dimension covering the full length of the length direction of the board | substrate 14, the resin cover 30 is the length which can cover the connection terminal 18 which comprises the card edge connection part 10. FIG. It is sufficient if there is a size.

  A terminal insertion hole 32 is formed in the resin cover 30 at a position overlapping with each connection terminal 18. As shown in FIG. 4, the terminal insertion hole 32 has a width dimension slightly larger than the width dimension of the corresponding connection terminal 18 and extends in a direction perpendicular to the longitudinal direction of the resin cover 30, and the insertion section 34. An accommodating portion 38 that opens to the lower surface 36 of the resin cover 30 is formed at an intermediate portion in the extending direction. In the insertion portion 34, a slope 40 is formed in an opening on the entrance side of a tab terminal 70 described later. In each insertion portion 34, an upper opening portion 44 is formed on the upper surface 42 of the resin cover 30 so as to extend across a series of insertion portions 34 arranged in parallel with the slope 40. As shown in FIG. 5, the insertion portion 34 is formed so as to penetrate the resin cover 30, and an end portion on the opposite side to the slope 40 is an inner side located inside the substrate 14 in the resin cover 30. Opened on the end face 46.

  Further, the length dimension of the accommodating portion 38 (the dimension in the left-right direction in FIG. 5) is substantially equal to the length dimension of the central portion 28 of the bonding wire 20 that is formed in the arch shape. As shown in FIG. 4, the accommodating portion 38 is formed as a single concave shape that is continuous across a series of terminal insertion holes 32 arranged in parallel. Thereby, compared with the case where the accommodating part 38 is formed independently for each terminal insertion hole 32, there is a risk of interference between the connection terminal 18 and the resin cover 30 when the resin cover 30 is superimposed on the substrate 14. Has been reduced.

  Further, in the resin cover 30, bolt holes 56 are formed at positions corresponding to the bolt insertion holes 52 penetrating in the empty space of the outer peripheral portion 16 of the substrate 14. Further, on the lower surface 36 of the resin cover 30, a positioning protrusion 58 that extends over the entire length of the resin cover 30 is formed at the end edge portion on the entrance side of the terminal insertion hole 32.

  Such a resin cover 30 is overlaid on the outer peripheral portion 16 of the substrate 14 as shown in FIG. The resin cover 30 is fixed by bolts 60 from the back side of the substrate 14 with the bolt holes 56 aligned with the corresponding bolt insertion holes 52 of the substrate 14. The positioning protrusion 58 formed on the lower surface 36 of the resin cover 30 is engaged with the outer peripheral edge 62 of the substrate 14 so that the resin cover 30 is positioned. As a result, as shown in FIG. 5, the central portion 28 of the bonding wire 20 constituting the connection terminal 18 is accommodated in the accommodating portion 38 of the terminal insertion hole 32 and positioned in the insertion portion 34 through the accommodating portion 38. ing. In addition, since both end portions 22a and 22b of the bonding wire 20 are sandwiched between the substrate 14 and the resin cover 30, the contact state between the bonding wire 20 and the printed wiring 26 of the substrate 14 is firmly maintained.

  A tab terminal 70 as a counterpart terminal shown in FIG. 6 is connected to the card edge connection unit 10, and the connection structure of the card edge connection unit according to the present embodiment includes the card edge connection unit 10 and the tab terminal 70. It consists of

  The tab terminal 70 has a flat tab shape formed by punching a metal plate, for example. The width dimension of the tab terminal 70 is slightly larger than the width dimension of the bonding wire 20 constituting the connection terminal 18. The tip edge portion of the tab terminal 70 has a tapered shape. Further, a contact protrusion 74 protruding on the contact surface 72 on the side in contact with the connection terminal 18 is formed at an intermediate portion in the length direction of the tab terminal 70 by embossing or the like. The tab terminal 70 may be provided on any member. For example, the tab terminal 70 may be provided on a printed board or a bus bar board, or may be provided in a connector provided on the end of an electric wire. It may be a connection terminal such as a fuse or a relay.

  Such a tab terminal 70 is inserted into the terminal insertion hole 32 of the card edge connecting portion 10 as shown in FIG. The tab terminal 70 is inserted through the insertion portion 34 of the terminal insertion hole 32. Since the upper opening 44 and the slope 40 are formed on the opening side of the terminal insertion hole 32, for example, the tab terminal 70 can be easily brought into contact with the slope 40 from the upper opening 44 to be easily inserted into the insertion part 34. Can be plugged in. When the tab terminal 70 is inserted into the insertion portion 34, the central portion 28 of the bonding wire 20 disposed in the insertion portion 34 through the communication portion 50 is brought into contact with the tab terminal 70. In particular, in the present embodiment, the contact protrusion 74 is formed on the tab terminal 70, so that the center portion 28 is more reliably contacted.

  According to the connection structure of the card edge connection portion 10 according to the present embodiment, the connection terminal 18 of the card edge connection portion 10 is formed by the bonding wire 20 in which the central portion 28 is floated from the surface 24 of the substrate 14. Thereby, spring property can be imparted to the connection terminal 18 on the substrate 14 side, and it is unnecessary to sandwich the substrate 14 on the counterpart terminal side connected to the connection terminal 18. As a result, the counterpart terminal can be a tab terminal 70 having a simple shape, and the connection structure can be reduced in size and weight.

  Further, a resin cover 30 in which a terminal insertion hole 32 is formed is provided in the card edge connection portion 10, and a central portion of the connection terminal 18 is inserted into the insertion portion 34 through which the tab terminal 70 is inserted in the terminal insertion hole 32. An accommodating portion 38 for positioning 28 is formed. Thereby, the tab terminal 70 is inserted into the terminal insertion hole 32, so that the connection terminal 18 can be reliably connected. In particular, since the terminal insertion hole 32 is opened on the inner end face 46 of the resin cover 30, the insertion state of the tab terminal 70 can be confirmed through the opening from the inner end face 46 side, or the electrode can be inserted from the opening to insert the tab. Energization to the terminal 70 can also be confirmed. Preferably, at the insertion end position of the tab terminal 70, the tip end surface 76 of the tab terminal 70 is positioned at the same position as the inner end surface 46 as shown in FIG. 7. In this way, the insertion state can be more easily confirmed by the position of the front end surface 76 of the tab terminal 70.

  Next, FIG. 8 and FIG. 9 show a card edge connection portion 80 constituting the connection structure of the card edge connection portion as the second embodiment of the present invention. In the following description, the same structures as those of the first embodiment are denoted by the same reference numerals as those of the first embodiment in the drawings, and the description thereof is omitted.

  In the present embodiment, another bonding wire 20b is connected to the inner end 22b of the substrate 14 of the bonding wire 20a constituting the connection terminal 18c among the connection terminals 18 of the card edge connection portion 80. The bonding wire 20b has substantially the same structure as the bonding wire 20a, and will be described using the same reference numerals as those of the bonding wire 20a. The bonding wire 20b extends with the same width as the bonding wire 20a and has a longitudinal central portion 28. Is formed in an arch shape that floats away from the surface 24 of the substrate 14. One end 22a of the bonding wire 20b is integrally connected to the inner end 22b of the substrate 14 in the bonding wire 20a, and the other end 22b of the bonding wire 20b is further connected to the inner side of the substrate 14. Is connected to a printed wiring 26 a exposed on the surface 24. Thereby, the bonding wire 20b is extended inward of the board | substrate 14 continuously from the bonding wire 20a. In short, the bonding wire 20b is formed by continuing the bonding from the bonding wire 20a.

  As shown in FIG. 9, the resin cover 30 of the present embodiment has a structure for avoiding interference with the central portion 28 of the bonding wire 20 b floating from the surface 24 of the substrate 14 at a position corresponding to the bonding wire 20 b. A notch 82 is formed. The notch 82 is communicated with the insertion portion 34 of the terminal insertion hole 32, whereby the central portion 28 of the bonding wire 20 a and the central portion 28 of the bonding wire 20 b are respectively positioned in the insertion portion 34.

  According to the card edge connecting portion 80 having such a structure, the bonding wire 20b extending from the bonding wire 20a is used as, for example, a jumper line, thereby improving the degree of freedom of circuit connection of the connection terminal 18c. Can do. The tab terminal 70 (see FIG. 7 and the like) connected to the connection terminal 18c may be in contact with both the bonding wire 20a and the bonding wire 20b, or may be in contact with only the bonding wire 20a. If the bonding wires 20a and 20b are in contact with each other, more excellent connection reliability can be obtained. The number of bonding wires to be connected is not limited in any way, and three or more bonding wires may be connected in series.

  Next, FIG. 10 shows a printed circuit board 92 having a card edge connection portion 90 that constitutes a connection structure of card edge connection portions as a third embodiment of the present invention. In the present embodiment, a plurality of connection terminals 18 (see FIG. 3 and the like) are formed in parallel on both surfaces of the outer peripheral portion 16 of the substrate 14. The resin cover 30 has a U-shape sandwiching the outer peripheral portion 16 of the substrate 14, and terminal insertion holes 32 are formed on both surfaces of the substrate 14.

  In the card edge connection portion 90 of the present embodiment, the connection terminals 18 are formed on both surfaces of the substrate 14. Thereby, the pole number of the card edge connection part 90 can be increased. That is, according to the card edge connection part 90 of the present invention, the connection terminal 18 itself has a spring property, so that it is unnecessary to make the counterpart terminal into a shape sandwiching the substrate 14. Accordingly, the connection terminals 18 can be provided on the front surface and the back surface of the substrate 14, respectively, and can be connected to different counterpart terminals. As a result, the number of poles of the card edge connection portion 90 can be increased.

  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 card edge connection portions may be formed on a plurality of sides of the outer peripheral portion of the substrate. In such a case, the card edge connection portions on all sides may be connected by connectors provided on the ends of the electric wires, or the card edge connection portion on one side is provided on another board. You may connect with an edge connector and connect the remainder with the connector provided in the terminal of the electric wire.

  Further, the resin cover is not always necessary. Furthermore, the contact protrusion 74 formed on the tab terminal 70 as the counterpart terminal in the embodiment is not necessarily required. In addition, the specific shape of the mating terminal to which the connection terminal of the card edge connection portion is connected is not limited to the tab shape, and may be, for example, a conventionally used one having a spring sandwiching the substrate. In such a case, the connection terminal spring and the counterpart terminal spring cooperate to obtain better connection reliability.

10, 80, 90: card edge connection portion, 12, 92: printed circuit board, 14: substrate, 16: outer peripheral portion, 18: connection terminal, 20: bonding wire, 22a, b: end, 24: surface, 26: Printed wiring, 28: center portion, 30: resin cover, 32: terminal insertion hole, 34: insertion portion, 38: housing portion, 46: inner end surface, 70: tab terminal (mating terminal), 72: contact surface, 74: Contact protrusion, 76: tip surface

Claims (8)

In a printed circuit board having a card edge connection portion in which a plurality of connection terminals are arranged in parallel on the outer peripheral portion of the substrate,
A printed circuit board provided with a card edge connection part, wherein the connection terminal is formed by fixing both ends of the band-shaped bonding wire to the substrate in a state where the central part is floated from the substrate. A resin cover is provided on the outer peripheral portion of the substrate, and terminal insertion holes corresponding to the connection terminals are formed in the resin cover,
The terminal insertion hole accommodates the insertion portion that inserts the counterpart terminal that comes into contact with the connection terminal, and the central portion of the connection terminal, and communicates with the insertion portion to place the central portion in the insertion portion. The printed circuit board provided with the card edge connection part of Claim 1 in which the accommodating part to position is formed. The printed circuit board provided with the card edge connection part according to claim 2, wherein a distal end side in the insertion direction of the counterpart terminal in the insertion part is opened in an end surface of the resin cover. The printed circuit board provided with the card edge connection part according to any one of claims 1 to 3, wherein the connection terminal is formed by arranging a plurality of the bonding wires in parallel. The printed board provided with the card edge connection part according to claim 1, wherein a bonding wire extending inward of the substrate is connected to the bonding wire constituting the connection terminal. The printed circuit board provided with the card edge connection part according to claim 1, wherein the connection terminals are formed on both surfaces of the substrate. A connection structure of a card edge connection portion in which a plurality of connection terminals are arranged in parallel on the outer peripheral portion of the substrate,
While using the card edge connection part of any one of Claims 1-6 as the said card edge connection part,
The mating terminal to be connected to the connection terminal of the card edge connection portion is a flat tab shape, and the mating terminal is connected by being brought into contact with the central portion of the connection terminal. The card edge connection structure characterized by the above.   The card edge connection part connection structure according to claim 7, wherein a contact protrusion that protrudes on a contact surface with the connection terminal is formed on the counterpart terminal.

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