JP2011066083A - Printed wiring board - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a printed wiring board with a novel structure that can have a large current circuit formed with superior cost efficiency and is flexibly adaptive to circuit alteration. <P>SOLUTION: A connection hole 20a is formed connecting with a through hole 16a which is formed in a substrate body 12 and into which a connection terminal 14 is inserted, and a linear conductive member 22a previously bent to have a pair of connection leg parts 26, 26 formed at both ends is soldered together with the connection terminal 14 by inserting the pair of connection leg parts 26, 26 into connection holes 20a, 20a formed connecting with different through holes 16a, 16a. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a printed wiring board in which a plurality of connection terminals are provided on a board body.

  Conventionally, printed wiring boards equipped with relays, fuses, etc. have been adopted in electrical junction boxes used in the electrical system of automobiles, and power from batteries has been efficiently distributed and fed to various loads. Yes. In this printed wiring board, a large number of connection terminals are projected in a connected state to a board circuit formed on the surface of the board body, and these connection terminals are connected to external electrical wiring as connector terminals, relays, It is designed to be connected to electrical parts such as fuses. For example, it is as described in patent document 1 (Unexamined-Japanese-Patent No. 2008-193773).

  By the way, with recent demands for miniaturization of electrical connection boxes and simplification of configuration, it is possible to connect electrical components that flow a relatively large current and electrical components to which a high voltage is applied to a printed wiring board. Is being considered. In order to meet such demands, a thick copper type printed wiring board (hereinafter referred to as thick copper) in which both the conductive path and the substrate body constituting the substrate circuit are formed thick to secure a current cross-sectional area of the conductive path. Substrate) has been proposed.

  However, since the thick copper substrate is expensive, there is a problem that the manufacturing cost of the electrical junction box is increased. Moreover, since the thick copper board is a printed wiring board, there is a problem that it is difficult to flexibly cope with circuit changes for each vehicle type.

JP 2008-193773 A

  The present invention has been made in the background of the above-mentioned circumstances, and its solution is a novel circuit that can form a large current circuit with excellent cost efficiency and can flexibly cope with a circuit change. It is to provide a printed wiring board having a simple structure.

  The first aspect of the present invention is a printed wiring board in which a plurality of connection terminals project from the board body, and the connection terminals are inserted and soldered through through holes formed in the board body. A connection hole is continuously provided with respect to the through hole, and a pair of connection legs that are bent in advance are formed on both ends by a linear conductive member. It is characterized by being respectively inserted through the connection holes provided in a row and soldered together with the connection terminals.

  According to this aspect, an electrical component through which a large current flows can be obtained by adopting a conductive member for a circuit portion of a connection terminal that requires a large current or a high voltage current to flow in a substrate circuit to secure a current cross-sectional area. It becomes possible to connect to a printed wiring board. Therefore, a large current circuit can be formed only by adopting a conductive member at an appropriate position of a conventional printed wiring board without employing a thick copper substrate. Thereby, the printed wiring board which can connect a high-current electrical component at low cost can be provided.

  And since the circuit part that needs to pass a large current or a high voltage current is formed using a conductive member that is separate from the substrate body, compared with the case where a large current circuit is configured using a conductive path of a thick copper substrate. Thus, an excellent heat dissipation effect can be obtained.

  In addition, it is possible to flexibly change the circuit by arbitrarily changing the formation position of the connection holes connected to the through holes, or appropriately selecting the connection holes of the standardized board by forming many connection holes. Can respond. Furthermore, since the conductive member is bent in a desired shape in advance, the shape on the substrate can be stably maintained without requiring special fixing means such as a single core wire that easily deforms. I can do it. As a result, the degree of freedom of the circuit configuration is high, and wiring between the connection terminals can be carried out greatly, or three-dimensional wiring can be performed.

  In addition, since the conductive member is bent in a desired shape in advance, excellent workability can be obtained when inserting into the connection hole or fixing to the substrate body. Furthermore, the fixing of the conductive member to the board body and the electrical connection with the connection terminal can be performed at the same time as the connection terminal with the connection terminal in the soldering process of the connection terminal to the board body, so that excellent manufacturing efficiency can be obtained. .

  In addition, the connection hole is continuously provided in the through hole means that the through hole and the connection hole are electrically connected independently of each other, and the through hole and the connection hole are connected to form a single hole. Any of the embodiments is included.

  According to a second aspect of the present invention, in the above-described first aspect, the through hole and the connection hole are continuously formed adjacent to each other, and the through hole and the connection are connected. The hole is surrounded by lands.

  If it does in this way, a connection terminal and an electrically-conductive member will be penetrated separately by the through hole and connection hole which were made into the mutually different hole, respectively. Therefore, the insertion state of the connection terminal and the conductive member can be facilitated, and the insertion state can be stabilized by ensuring the alignment accuracy.

  A third aspect of the present invention is the one described in the first or second aspect, wherein the through hole and the connection hole are connected to each other and formed as a single hole. It is.

  In this way, the through hole and the connection hole can be easily formed. In addition, since the through hole and the connection hole can be provided in a compact manner, the space efficiency on the substrate can be improved. Furthermore, the connection terminal and the conductive member can be brought into direct contact within the single hole, and the electrical connection can be stabilized.

  A fourth aspect of the present invention is the one according to any one of the first to third aspects, wherein a plurality of the connection holes are formed continuously with respect to one of the through holes. is there. In this way, a plurality of conductive members can be connected to one connection terminal, and one-to-many connection is possible. Thereby, the freedom degree of a circuit structure can be improved more.

  According to a fifth aspect of the present invention, in the one described in any one of the first to fourth aspects, the conductive member uses a cutting wire that is formed by bending a metal wire to be bent into an arbitrary shape. It is configured. By using the cutting wire, it is possible to easily perform a pre-bending process to a desired shape and to stably maintain the circuit shape.

  According to the present invention, a large current circuit is formed of a conductive member having a desired current cross-sectional area. Thereby, a large current circuit can be formed on a printed wiring board with excellent cost efficiency without employing a thick copper board. Then, by appropriately selecting a connection hole through which the conductive member is inserted, it is possible to flexibly cope with a circuit change.

1 is a perspective view of a printed wiring board as a first embodiment of the present invention. The top view of the board | substrate body which comprises the printed wiring board shown in FIG. The side view of the electrically-conductive member provided in the printed wiring board shown in FIG. Cross-sectional explanatory drawing equivalent to the IV-IV cross section in FIG. Cross-sectional explanatory drawing equivalent to the VV cross section in FIG. The perspective view of the printed wiring board as 2nd embodiment of this invention. The top view of the printed wiring board shown in FIG. Explanatory drawing for demonstrating the aspect from which a connection hole differs. Explanatory drawing for demonstrating the different aspect of an electroconductive member.

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

  First, FIG. 1 shows a printed wiring board 10 as a first embodiment of the present invention. The printed wiring board 10 has a structure in which a plurality of connection terminals 14 project from a board body 12.

  FIG. 2 shows the substrate body 12. As the substrate body 12, for example, a conventionally known substrate in which a wiring circuit pattern formed by etching a copper foil or the like is provided on the surface of an insulating substrate such as paper or glass cloth can be employed. A plurality of through holes 16 penetrating in the thickness direction are formed in the substrate body 12. The through hole 16 in the present embodiment has a substantially oval elongated hole shape corresponding to the flat plate shape of the connection terminal 14. A land 18 made of a copper foil or the like is formed on the opening peripheral edge of the through hole 16.

  Connection holes 20 a and 20 b are connected to some of the plurality of through holes 16. Hereinafter, the through hole 16a is provided with the connection hole 20a and the through hole 16b is provided with the connection hole 20b. The connection hole 20a is a through-hole penetrating the substrate body 12 in the thickness direction, and is formed independently of each other as a different hole from the through-hole 16a. Although the shape of the connection hole 20a is not limited in any way, in this embodiment, the connection hole 20a extends in the thickness direction of the substrate body 12 with a substantially constant circular cross-sectional shape corresponding to the cross-sectional shape of the conductive member 22a described later. Has been issued. The connection holes 20a are formed adjacent to the through holes 16a at a predetermined distance, and the peripheral edges of the through holes 16a and the connection holes 20a are surrounded by the lands 18.

  The number of connection holes 20a provided continuously with respect to one through hole 16a is not limited, and may be one or two or more. FIG. 2 shows one connecting hole 20a connected to one through hole 16a and two connecting holes 20a and 20a connected to one through hole 16a. When a plurality of connection holes 20a are connected to one through hole 16a, the through holes 16a and the plurality of connection holes 20a are collectively surrounded by the land 18.

  On the other hand, the connection hole 20b is connected to the through hole 16b. The connection hole 20 b is formed by partially increasing the width of the through hole 16 b that penetrates the substrate body 12, and the through hole 16 b and the connection hole 20 b are connected to each other to penetrate the substrate body 12. It is formed as a single hole. The cross-sectional shape of the connection hole 20b is not particularly limited, but in the present embodiment, the substrate has a substantially constant substantially semicircular cross-section that protrudes outward from the straight portion of the through hole 16b having a substantially oval shape. The main body 12 is penetrated in the thickness direction.

  And the electrically-conductive member 22a shown in FIG. 3 is arrange | positioned ranging over a pair of connection hole 20a, 20a provided in a row by mutually different through-holes 16a, 16a. The conductive member 22a has a predetermined length of a metal wire formed from a metal material having conductivity such as gold, copper, copper alloy, or a metal material such as iron plated on the surface with the conductive metal material. It is formed from the cutting wire cut | disconnected by. The conductive wire 22a is formed into a linear metal wire having a pair of connecting legs 26 extending in the same direction from both ends of the circuit portion 24 by bending the cutting wire into a U-shape. ing. Further, the conductive member 22a is formed by bending a metal wire having an appropriate cross-sectional area and strength, so that the shape after bending can be maintained.

  In this embodiment, the conductive member 22a has a U shape and the circuit portion 24 has a linear shape. However, the circuit portion 24 is bent into an arbitrary shape according to a required circuit arrangement shape. It is formed. The cross-sectional shape of the conductive member 22a is not particularly limited, and a rectangular shape such as a square or a rectangle, a circular shape including an ellipse, or any other shape can be adopted as appropriate. A circular cross section or a square cross section that can be bent in any direction is preferably used. The conductive member 22a in the present embodiment has a circular cross section.

  In addition, a conductive member 22b is disposed across a pair of connection holes 20b and 20b that are connected to different through holes 16b and 16b. Since the conductive member 22b has substantially the same structure as that of the conductive member 22a, detailed illustration is omitted. Like the conductive member 22a, a metal wire is bent and formed in a U-shape. The bent metal wire has a substantially square cross section.

  Then, as shown in FIG. 4, the connection terminals 14 are respectively inserted into the through holes 16 and fixed to the substrate body 12 with solder 28, so that each connection terminal 14 protrudes from the surface 30 a of the substrate body 12. Is done. Further, the pair of connection legs 26, 26 of the conductive member 22a are inserted into the connection holes 20a, 20a connected to the respective other pairs of through holes 16a, 16a, and are inserted into the through holes 16a, 16a. The connection terminals 14 and 14 together with the solder 28 are fixed to the substrate body 12. As a result, the connection legs 26 and 26 of the conductive member 22a are electrically connected to the pair of connection terminals 14 and 14 inserted through the through holes 16a and 16a via the solder 28 and the land 18, and these connections are made. The terminals 14 and 14 are electrically connected via the conductive member 22a.

  On the other hand, as shown in FIG. 5, the connection terminals 14 and 14 are respectively inserted into the other pair of through holes 16 b and 16 b and fixed to the substrate body 12 with solder 28. Further, the connection legs 20 and 20b connected to the through holes 16b and 16b as the same hole are inserted into the connection legs 26 and 26 of the conductive member 22b, and the connections inserted into the through holes 16b and 16b. The terminals 14 and 14 are fixed to the substrate body 12 with solder 28. As a result, the connection legs 26 and 26 of the conductive member 22b are electrically connected to the pair of connection terminals 14 and 14 inserted through the through holes 16b and 16b via the solder 28. 14 are electrically connected through the conductive member 22b. Note that the connection leg portion 26 of the conductive member 22b may be disposed with a gap with respect to the connection terminal 14 in the through hole 16b and electrically connected via the solder 28. As shown in FIG. 5, the contact terminal 14 is directly contacted in the through hole 16b.

  As apparent from FIGS. 4 and 5, the conductive members 22 a and 22 b have connection legs 26 and 26 projecting from the surface 30 a of the substrate body 12 by a predetermined dimension, respectively, and the circuit portion 24 of the substrate body 12. The substrate body 12 is fixed at a predetermined distance from the surface 30a.

  In addition, such a printed wiring board 10 is suitably manufactured by a conventionally known method by handling the conductive members 22a and 22b in the same manner as the connection terminal 14. For example, the connection terminal 14 is set to a jig (not shown) in a state where the insertion portion to the board body 12 is projected, and the conductive members 22a and 22b are projected together with the connection terminal 14 and the connection leg 26 is projected. Set the jig in the state. Next, the substrate body 12 is overlapped with the connection terminals 14 and the conductive members 22a and 22b from the surface 30a side, and the connection terminals 14 and the connection legs of the conductive members 22a and 22b are connected to the through holes 16 and the connection holes 20a and 20b. 26 is inserted from the front surface 30a side and protrudes to the back surface 30b side of the substrate body 12. Then, the connection terminals 14 and the conductive legs 22a and 22b are fixed to the substrate body 12 by soldering the connection terminals 14 and the connection legs 26 protruding from the back surface 30b of the substrate body 12 from the back surface 30b side.

  According to the printed wiring board 10 having such a structure, the connection terminals 14 and 14 can be electrically connected by the conductive members 22a and 22b having a predetermined cross-sectional area. Accordingly, a large current circuit through which a large current or a high voltage current flows can be formed on the substrate body 12 without securing a current cross-sectional area with the conductive members 22a and 22b and using a thick copper substrate. As a result, a printed wiring board capable of connecting a large current electrical component can be provided at a low cost. Moreover, the number of bus bars stacked can be reduced by replacing the bus bar circuit conventionally used in the electrical junction box with the printed wiring board 10 with the conductive members 22a and 22b.

  Furthermore, since the conductive members 22a and 22b through which a large current flows are separated from the substrate body 12, the heat generation suppressing effect of the substrate body 12 can also be exhibited. In particular, since the circuit portion 24 is disposed away from the substrate body 12, a more excellent heat generation suppression effect is exhibited.

  Further, by arbitrarily setting the formation positions of the connection holes 20a and 20b, it is possible to flexibly cope with circuit changes. Also, a plurality of types of printed wiring boards can be provided at low cost by forming a large number of connection holes 20a and 20b, standardizing the substrate body 12, and selecting the connection holes 20a and 20b as appropriate. Furthermore, since the conductive members 22a and 22b can hold a desired circuit shape that has been bent in advance, the circuit wiring shape can be stably maintained, and the conductive members 22a and 22b are disposed across the connection terminals 14 and 14 greatly. Or three-dimensional routing.

  Further, according to the connection hole 20a formed as a separate hole with respect to the through hole 16a, the connection terminal 14 and the conductive member 22a are inserted into the separate holes, respectively, ensuring the respective alignment accuracy and Insertion work can be facilitated. On the other hand, according to the connection hole 20b formed as a single hole connected to the through hole 16b, the formation is easy, and the through hole 16b and the connection hole 20b can be formed with high space efficiency. In addition, as shown in FIG. 5, the electrical connection can be stabilized by bringing the connection leg portion 26 into contact with the connection terminal 14 in the connection hole 20b.

  In addition, the conductive members 22a and 22b can be handled in the same manner as the connection terminals 14 and can be soldered together with the connection terminals 14 in the same process according to a conventionally known process of soldering the connection terminals to the substrate body. . Thereby, the outstanding manufacturing efficiency can be obtained. In particular, since the conductive members 22a and 22b maintain their own shapes, no special fixing means are required as in the case of a single core wire, and the connection holes 20a and 20b can be easily inserted into the conductive members 22a and 22b. It is also possible to automatically insert the connection holes 20a and 20b using an insertion machine.

  Next, FIGS. 6 and 7 show a printed wiring board 40 as a second embodiment of the present invention. In the following description, the same members and parts as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and the description thereof is omitted as appropriate.

  A connection terminal 42 and a connection terminal 44 project from the board body 12 of the printed wiring board 40 by soldering. The connection terminal 42 has a tuning fork shape and is a fuse connection terminal connected to a fuse terminal (not shown). The connection terminal 44 is a tab-like terminal having a wide flat plate shape. Each of the connection terminals 42 and 44 has a shape in which a pair of leg portions protrudes.

  A plurality of through holes 16 are provided in the substrate body 12. Of the plurality of through holes 16, a connection hole 20c is connected to the through hole 16c. The connection hole 20 c penetrates the substrate body 12 and is connected to the through hole 16 c, and the connection hole 20 c and the through hole 16 c are formed as a single hole that penetrates the substrate body 12. In the present embodiment, the through hole 16 in which the connection hole 20c is not formed has a substantially circular shape, while the through hole 16c in which the connection hole 20c is formed has a substantially oval shape.

  A pair of leg portions projecting from the connection terminals 42 and 44 are inserted into the pair of through holes 16 and soldered. As described above, the connection terminal 42 is a fuse connection terminal, and a pair of connection terminals 42 and 42 are arranged to face each other and correspond to a pair of terminals in one fuse, and a pair of connections arranged to face each other. A plurality of sets of terminals 42 and 42 are arranged in parallel. 6 and 7, a pair of terminal groups 46 a and 46 b in which a plurality of pairs of connection terminals 42 and 42 are arranged in parallel on a straight line are arranged in parallel.

  In each of the terminal groups 46a and 46b, one of the connection terminals 42 and 42 of each set is inserted into the through hole 16c in which the connection hole 20c is formed, and the parallel direction of the connection terminals 42 (in FIG. 7, The connection legs 26 and 26 of the conductive member 22b are respectively inserted and soldered into a pair of connection holes 20c and 20c adjacent in the left-right direction). As a result, the conductive member 22b is disposed across the connection terminals 42 and 42 for each of the adjacent connection terminals 42 and 42, and a plurality of connection terminals 42 arranged in a straight line are arranged along the parallel direction. They are electrically connected by a plurality of conductive members 22b arranged on a straight line.

  Further, tab-shaped connection terminals 44 are disposed outside the terminal group 46a in the arrangement direction. The through hole 16c into which one leg of the tab-like connection terminal 44 is inserted is a single hole formed by connecting a pair of connection holes 20c, 20c on both sides of the through hole 16c.

  On the other hand, in the board body 12, on the outer side in the arrangement direction of the terminal group 46b, on the same side as the connection terminal 44, a pair of connection holes 20a, 20a are connected to each other and formed into a single hole shape. Is penetrated. The relay connection hole 48 is formed in an oval shape having a size that allows the pair of connection legs 26 and 26 to be inserted therethrough.

  One of the connection hole 20c connected to the through hole 16c formed at the end of the terminal group 46a in the arrangement direction and the connection holes 20c and 20c connected to the through hole 16c through which the connection terminal 44 is inserted. The conductive member 22b is disposed across the two. Thereby, the connection terminal 44 and the connection terminal 42 located at the end in the arrangement direction of the terminal group 46a are electrically connected via the conductive member 22b.

  Furthermore, the conductive member 22b is disposed across the other of the connection holes 20c, 20c provided continuously to the through hole 16c through which the connection terminal 44 is inserted and one of the connection holes 20a, 20a in the relay connection hole 48. Is done. Thus, the connection terminal 44 is soldered together with the connection legs 26 and 26 so that one leg is sandwiched between the connection legs 26 and 26 of the pair of conductive members 22b and 22b in the through hole 16c. Has been.

  In addition, the conductive member 22b extends across the connection hole 20c connected to the through hole 16c positioned at the end of the terminal group 46b in the arrangement direction and the other of the connection holes 20a and 20a in the relay connection hole 48. Arranged. Thereby, one connection leg part 26 and 26 in each of a pair of electrically-conductive member 22b and 22b is penetrated by the connection hole 48 for relay, and is mutually soldered. The connection terminal 44 is electrically connected to the connection terminal 42 disposed at the end portion in the arrangement direction of the terminal group 46b through the pair of conductive members 22b and 22b inserted through the relay connection hole 48. ing.

  Thereby, the one side connection terminal 42 in the terminal group 46a and the one side connection terminal 42 in the terminal group 46b are connected to the conductive member 22b extending from the terminal group 46a to the connection terminal 44, and the pair of relay connection holes 48. The conductive members 22b and 22b are electrically connected to each other. In short, a U-shaped current circuit is formed by the plurality of conductive members 22b, and the U-shaped current circuit is disposed across the pair of terminal groups 46a and 46b, whereby the terminal groups 46a and 46b. The connection terminals 42 on one side of each are electrically connected to the U-shaped current circuit. And the connection terminal 44 is provided on the relay circuit straddling between the terminal groups 46a and 46b.

  As is clear from the present embodiment, the specific shape of the connection terminal protruding from the board body is not particularly limited. Further, a plurality of connection holes 20b and 20b may be connected and formed as a single hole like a through hole 16c through which the connection terminal 44 is inserted. Further, a relay circuit may be formed by forming the relay connection hole 48 and inserting one or both of the pair of connection legs 26, 26 of the conductive member 22b into the relay connection hole 48. The relay connection hole 48 may be formed by, for example, forming the plurality of connection holes 20a and 20a independently as separate holes and surrounding the plurality of connection holes 20a and 20a with the lands 18, for example. good.

  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 specific shape of the connection hole is not limited, and various shapes can be appropriately employed in consideration of the cross-sectional shape of the inserted conductive member. In addition, as shown in FIG. 8, it is possible to form both of two types of connection holes 20 a and 20 b with respect to one through hole 16.

  Further, as shown in FIG. 9 as an example of the conductive member 22a, a flange 50 protruding in the direction perpendicular to the axis may be formed on the connecting legs 26, 26 by pressing or the like. In this way, the insertion amount of the conductive member 22a can be defined by locking the flange portion 50 to the surface 30a of the substrate body 12.

10, 40: Printed circuit board, 12: Board body, 14, 42, 44: Connection terminal, 16a, b, c: Through hole, 18: Land, 20a, b, c: Connection hole, 22a, b: Conductive member , 24: circuit portion, 26: connection leg portion, 28: solder, 30a: front surface, 30b: back surface, 46a, b: terminal group, 48: connection hole for relay, 50: flange portion

Claims (5)

In a printed wiring board in which a plurality of connection terminals protrude from the board body,
The connection terminal is inserted and soldered through a through hole formed in the substrate body, and a connection hole is continuously provided with respect to the through hole, and a pair of connection legs bent in advance are provided. The linear conductive members formed at both ends are respectively soldered together with the connection terminals by inserting the pair of connection legs into the connection holes connected to the other through holes. Printed wiring board.   2. The printed wiring board according to claim 1, wherein the through hole and the connection hole are formed adjacent to each other independently of each other, and the through hole and the connection hole are surrounded by lands.   The printed wiring board according to claim 1, wherein the through hole and the connection hole are connected to each other so as to be formed as a single hole.   The printed wiring board according to claim 1, wherein a plurality of the connection holes are continuously formed with respect to one of the through holes.   The printed wiring board according to any one of claims 1 to 4, wherein the conductive member is configured by using a cutting wire formed by bending a metal wire to be bent into an arbitrary shape.

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