JP5063672B2 - Wiring board and manufacturing method thereof - Google Patents

Description

  The present invention relates to a connection structure for connecting a conductor to a wiring pattern formed on a surface of a substrate.

  Regarding a connection structure for connecting a conductor to a wiring pattern formed on the surface of a wiring board, a structure in which a bus bar is connected to the wiring pattern is often used particularly when the current is large.

  Conventionally, for example, in a high-current printed wiring board in which a wiring pattern is formed on a substrate and a bus bar is attached on the wiring pattern, a through hole is formed in a part of the wiring pattern, and the through hole is used as a rivet. A method of mechanically pressure-bonding the bus bar has been proposed (see, for example, Patent Document 1).

  In such a connection structure using rivets, since the wiring pattern and the bus bar are crimped by the rivets, the connection is surely performed, and the bus bar is not likely to drop off due to thermal fluctuations and vibrations, and the reliability is improved. high.

  As another example, a conductive connection member having substantially the same thickness as that of the substrate is embedded in a through hole provided in the substrate to be connected to a wiring provided in the substrate, and a female screw hole is provided in the conductive connection member. A connection structure for connecting a bus bar, a crimp terminal for a large current, or the like by forming the structure has been proposed (for example, see Patent Document 2).

  Since such a board-embedded conductive connecting member has substantially the same thickness as the board, the height of connection to the board can be suppressed without sacrificing assembly and maintenance (for example, Patent Document 2). reference).

  Furthermore, conventionally, another example of a connection structure for connecting a bus bar to a wiring pattern formed on the surface of a wiring board has been proposed in which a screw hole is directly formed in the bus bar and screwed.

Japanese Utility Model Publication No. 06-011371 JP 2001-102111 A

  However, regarding the method for crimping the bus bar to the through hole of the board as described above with a rivet, the conductor cannot be easily removed at the time of board replacement or disposal, and it is necessary to remove the conductor and the printed board at the same time. For this reason, there has been a problem that it takes time to replace the substrate, and it is difficult to separate at the time of disposal.

  Further, in the connection structure using the above-described embedded substrate type conductive connection member, since a current flows through the conductive connection member, a current capacity of the conductive connection member is required. In addition, a current flows in the soldering portion, and a heat cycle occurs in the solder connection portion, and there is a problem that reliability is lowered due to generation of a solder crack due to the influence.

  Furthermore, in the connection structure in which a screw hole is directly formed in the bus bar and screwed, in order to form the female screw hole, the bus bar needs to have a predetermined thickness, which increases the cost. Further, when the bus bar is screwed to the substrate, it is necessary to reach out to the bolt on the back side of the substrate, and it is necessary to turn the substrate over.

  The present invention has been made in view of the above, and it is possible to reduce the thickness of a conductor such as a bus bar connected to a wiring pattern (the thickness of the conductor can be freely selected). An object of the present invention is to provide a wiring board capable of fixing a conductor only by screwing work from one direction to a board body having a fastening member fixed to a second surface, and a method for manufacturing the wiring board.

  In order to solve the above-described problems and achieve the object, a wiring board according to the present invention includes a substrate body having a wiring pattern on a first surface and a through hole formed at a location including the wiring pattern, and a wiring pattern. A conductor that is in direct contact and has a through-hole formed on the contact surface with the wiring pattern, a fastening member that is fixed to a second surface opposite to the first surface of the substrate body, and a conductor through-hole from the first surface side And a fixing screw that connects the wiring pattern and the conductor by being inserted into the through hole of the board body and screwed into the fastening member.

  In the method for manufacturing a wiring board according to the present invention, a through hole is formed in a portion of the first surface of the board body where the wiring pattern is formed, and is fastened to the second surface opposite to the first surface of the board body. The member is fixed, the conductor in which the through hole is formed is arranged so as to be in direct contact with the wiring pattern, and the fixing screw is inserted from the first surface side of the board body into the through hole of the conductor and the through hole of the board body. Further, the wiring pattern and the conductor are connected by further fastening with a fastening member.

  Here, the above-mentioned through hole is not limited to a shape in which the hole is closed over the entire circumference around the central axis. For example, a shape such as a notch that substantially surrounds the fixing screw that passes through the inside of the through hole. Is included.

  According to the present invention, there is no need to form a screw on the conductor, the conductor thickness can be reduced (the conductor thickness can be freely selected), and a fastening member is previously provided on the second surface. Since the conductor can be fixed to the fixed board main body only by screwing from one direction, workability is good, and parts can be easily replaced and the board can be easily disassembled.

FIG. 1 is a diagram showing a first embodiment of a wiring board according to the present invention, and is a perspective view of a main part of a conductor connection structure. FIG. 2 is an exploded perspective view of the wiring board shown in FIG. FIG. 3 is a cross-sectional view showing a state in which the fastening member of the first embodiment is attached to the wiring board. FIG. 4 is a perspective view showing a state in which a conductor is joined to a wiring board. FIG. 5 is a perspective view of the wiring board to which the fastening member is attached as viewed from the back side. FIG. 6 is a cross-sectional view for explaining the original usage of the terminal block that is the fastening member of the first embodiment. FIG. 7 is a diagram for explaining one of the effects of the wiring board according to the first embodiment, and is a perspective view showing a state in which the wiring board is disposed close to the cover. FIG. 8 is a diagram showing a second embodiment of a wiring board according to the present invention, and is a perspective view of the wiring board to which a fastening member is attached as viewed from the back side. FIG. 9 is a diagram showing a third embodiment of the wiring board according to the present invention, and is a perspective view of the wiring board to which the fastening member is attached as viewed from the back side. FIG. 10 is a perspective view showing another example of the conductor used in the first to third embodiments. FIG. 11 is a perspective view showing still another example of the conductor used in the first to third embodiments. FIG. 12 is a perspective view showing still another example of the conductor used in the first to third embodiments.

  Embodiments of a wiring board and a method for manufacturing the same according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

Embodiment 1 FIG.
FIG. 1 is a diagram showing a first embodiment of a wiring board according to the present invention, and is a perspective view of a main part of a conductor connection structure. FIG. 2 is an exploded perspective view of the wiring board shown in FIG. FIG. 3 is a cross-sectional view showing a state in which the fastening member of the present embodiment is attached to the wiring board. FIG. 4 is a perspective view showing a state in which a conductor is joined to a wiring board. FIG. 5 is a perspective view of the wiring board to which the fastening member is attached as viewed from the back side. In each figure, the main part of the conductor connection portion is described, and actually, the substrate body 1 is spread over a wider range on the same plane. The bus bar (conductor) 3 extends to other parts (not shown) to be electrically connected.

  The wiring board of the present embodiment is fixed to the substrate body 1 which is a substantially flat printed wiring board, the bus bar (conductor) 3 connected to the wiring pattern 1 a of the board body 1, and the back surface of the substrate body 1. The fastening member 5 includes a fixing screw 7 that connects the wiring pattern 1 a and the bus bar 3.

  A wiring pattern 1a is formed on at least the first surface (surface on the A side in the drawing) of the substrate body 1 (another wiring pattern is formed on the second surface (surface on the B side in the drawing) opposite to the first surface). May be provided). A bus bar 3 is connected to the wiring pattern 1a. A part of the portion where the wiring pattern 1a is formed is a connection position of the bus bar 3, and a resist for insulating the surface is not formed at this position. And the through-hole 1b is drilled in the center part of this connection position (FIG. 2).

  The bus bar 3 includes a connection portion 3a that overlaps the wiring pattern 1a and a main body portion 3b that rises from one end of the connection portion 3a. The connecting portion 3a is directly connected (surface contact) to the wiring pattern 1a. Although not shown in the figure, the main body 3b of the bus bar 3 extends to other parts (not shown) as described above. The bus bar 3 constitutes an electrical path through which a large current flows between the other components and the wiring pattern 1a. And the through-hole 3c is drilled in the center part of the connection part 3a of the bus bar 3 (FIG. 2).

  A fastening member 5 is provided on a second surface (surface on the B side in the drawing) opposite to the first surface of the substrate body 1. The fastening member 5 is composed of a rectangular flat plate-like fastening part body 5a and leg parts 5b that stand on the board body 1 and support the four corners of the fastening part body 5a. A female screw hole 5c is formed in the central portion of the fastening portion main body 5a (FIG. 2). As shown in FIG. 3, the fastening member 5 is fixed to the board body 1 by soldering the tip of the leg part 5 b on the side facing the fastening part body 5 a to the board body 1. A current flows to the bus bar 3 through a portion of the wiring pattern 1a where the insulating resist is not formed. For this reason, the fastening member 5 and the wiring pattern 1a do not need to be electrically connected. That is, the fastening member 5 and the wiring pattern 1a may be insulated. Since the fastening member 5 is not related to the current circuit, the fastening member 5 does not need to have an electric capacity and may have a predetermined mechanical strength.

  The fixing screw 7 includes a threaded portion 7b that is screwed on the outer periphery to form a male screw, and a head 7a that is formed at one end of the threaded portion 7b. The threaded portion 7 b of the fixing screw 7 passes through the through hole 3 c of the bus bar 3 and the through hole 1 b of the substrate body 1 and is screwed into the female screw hole 5 c of the fastening member 5. The through hole 3c and the through hole 1b are sized so as to have a predetermined clearance with respect to the threaded portion 7b, that is, a fool hole. The fixing screw 7 electrically connects the wiring pattern 1a and the bus bar 3 with the bus bar 3 and the substrate body 1 being strongly sandwiched between the head 7a and the fastening member 5.

  As described above, according to the wiring board of the present embodiment, the bus bar 3 and the wiring pattern 1a are directly connected, so that a large current flows between them with high reliability. Further, since it is not necessary to screw into the bus bar 3, the thickness of the connection portion 3a of the bus bar 3 can be reduced (the thickness of the bus bar 3 can be freely selected). Furthermore, the wiring pattern 1a and the bus bar 3 can be electrically connected by screwing work from one direction, the workability is good, and the parts can be easily replaced and the board can be easily disassembled.

  FIG. 6 is a cross-sectional view for explaining the original usage of the terminal block which is the fastening member 5 of the present embodiment. The fastening member 5 of the present embodiment uses a commercially available general-purpose terminal block 5 which is fixed on the wiring board 11 and used for fixing the terminals 14 at a flow rate. Thus, cost reduction is achieved by diverting the commercially available terminal block 5. As shown in FIG. 6, the terminal block 5 is fixed with solder 12 so as to be connected to the wiring pattern 11c formed on the wiring board 11, and the terminal 14 and the wiring pattern fastened to the fastening portion main body 5a. The electrical connection with 1c is realized. In the usage of the present embodiment, since the fastening member 5 is not electrically connected to the wiring pattern 11c as described above, the fastening member 5 may be made of an insulating material as well as a conductive material. By producing the fastening member 5 with an insulating material such as resin, the cost can be reduced.

  Further, since the fastening member 5 of the present embodiment is composed of the fastening portion main body 5a and the leg portions 5b that support the fastening portion main body 5a from the substrate main body 1, a predetermined amount is provided between the fastening portion main body 5a and the substrate main body 1. The fixing screw 7 is supported at two points separated by a predetermined interval in the length direction, so that the fixing screw 7 is fixed more stably.

  In this embodiment, since the fixing screw 7 does not participate in electrical conduction, the fixing screw 7 may also be made of an insulating material as well as a conductive material. By using together the fastening member 5 made of an insulating material and the fixing screw 7 made of an insulating material, the following effects can be obtained. FIG. 7 is a perspective view for explaining one of the effects of the wiring board of the present embodiment. In FIG. 7, the substrate body 1 is disposed close to the cover 51. For example, when the cover 51 is made of metal, it must be separated from a portion (circuit) through which current flows by a predetermined distance (not limited to the cover, the conductive member must be separated from the circuit by a predetermined distance). Since the fastening member 5 and the fixing screw 7 are made of an insulating material, no current flows through them, so that they can be placed close to or in contact with the cover 51 (conductive member). Thereby, size reduction of an apparatus can be achieved.

Embodiment 2. FIG.
FIG. 8 is a diagram showing a second embodiment of a wiring board according to the present invention, and is a perspective view of the wiring board to which a fastening member is attached as viewed from the back side. The fastening member 15 according to the present embodiment is composed of a rectangular flat plate-like fastening part main body 15a and a leg part 15b that stands on the board main body 1 and supports one side of the fastening part main body 15a. It has a letter shape. The fastening member 15 is fixed to the substrate body 1 with an adhesive on the side opposite to the fastening portion body 15a of the leg portion 15b. The configuration of the first surface (the surface on the A side in the drawing) of the substrate body 1 is the same as that of the first embodiment. The threaded portion 7b of the fixing screw 7 (not shown) passes through the through hole 3c of the bus bar 3 (not shown) and the through hole 1b of the substrate body 1, and is screwed into the female screw hole 15c of the fastening member 15. The fastening member 15 is produced by bending a sheet metal or resin mold. Other configurations are the same as those of the first embodiment.

  In the wiring board having such a configuration, effects similar to those of the first embodiment can be obtained, and the fastening member 15 can be manufactured at a low cost with a simple structure, so that the cost can be reduced.

Embodiment 3 FIG.
FIG. 9 is a diagram showing a third embodiment of the wiring board according to the present invention, and is a perspective view of the wiring board to which the fastening member is attached as viewed from the back side. The fastening member 17 according to the present embodiment is a general nut fixed to the board body 1. The configuration of the first surface (the surface on the A side in the drawing) of the substrate body 1 is the same as that of the first embodiment. The threaded portion 7b of the fixing screw 7 (not shown) passes through the through hole 3c of the bus bar 3 (not shown) and the through hole 1b of the substrate body 1, and is screwed into the female screw hole 17c of the fastening member 17. Other configurations are the same as those of the first embodiment.

  In the wiring board having such a configuration, there is no predetermined gap between the board body 1 and the fastening member 17, so that the fixing screw 7 is not supported at two points separated by a predetermined gap in the length direction. However, the axial direction thickness of the fastening member 17 is larger than that of the fastening part main bodies 5a and 15a of the first and second embodiments, whereby the fixing screw 7 is stably fixed. In addition to substantially the same effects as those of the first and second embodiments, the fastening member 17 is a general nut, so that the cost can be reduced.

  FIG. 10 is a perspective view showing another example of the conductor used in the first to third embodiments. FIG. 11 is a perspective view showing still another example of the conductor used in the first to third embodiments. FIG. 12 is a perspective view showing still another example of the conductor used in the first to third embodiments. In the first to third embodiments, the conductor connected to the wiring pattern 1a is the bus bar 3, but the round crimp terminal 23 as shown in FIG. 10 or the Y shape as shown in FIG. A crimp terminal 25 or the like may be used. Furthermore, as shown in FIG. 12, the end of the electric wire may be formed in a U shape. As described in the first to third embodiments, the conductor is held between the substrate body 1 and the head 7 a of the fixing screw 7. Therefore, like the Y-shaped crimp terminal 25 in FIG. 11 and the U-shaped electric wire 27 in FIG. 12, the holes formed in the conductor do not have to be closed over the entire circumference. Similarly, the through-hole 1c formed in the substrate body 1 may not be closed over the entire circumference.

  As described above, the wiring board and the manufacturing method thereof according to the present invention are useful for a connection structure that connects a conductor to a wiring pattern formed on the surface of the board, and in particular, connects a conductor through which a large current flows. Suitable for connection structures.

DESCRIPTION OF SYMBOLS 1 Substrate body 1a, 1c Wiring pattern 1b Through hole 3 Busbar (conductor)
3a connection part 3b body part 3c through-hole 5 fastening member (terminal block)
5a Fastening part main body 5b Leg part 5c Female screw hole 7 Fixing screw 7a Head part 7b Screw part 11 Wiring board 12 Solder 15, 17 Fastening member 15a Fastening part main body 15b Leg part 15c, 17c Female screw hole 51 Cover A 1st surface B 1st 2 sides

Claims (7)

A substrate body having a wiring pattern on the first surface and having a through-hole formed at a location including the wiring pattern;
It has a contact surface that contacts directly on the wiring pattern, a conductor through hole in the contact surface is formed,
A fastening member fixed in advance to a second surface opposite to the first surface of the substrate body;
A screw shaft is inserted into the through hole of the conductor from the first surface side so that the screw head is disposed on the first surface side, and is inserted into the through hole of the substrate body and screwed with the fastening member. A wiring board comprising: a fixing screw that sandwiches the conductor between the screw head and the board body and connects the wiring pattern and the conductor. The surface of the wiring pattern is covered with a resist,
The wiring board according to claim 1, wherein the conductor is disposed in a portion of the wiring pattern where there is no resist. The fastening member has a fastening portion main body formed with a female screw that is screwed with the fixing screw, and at least one leg portion that supports the fastening portion main body at a predetermined height from the substrate body. The wiring board according to claim 1 or 2. The wiring board according to claim 1, wherein the fastening member is made of an insulating material. The wiring board according to any one of claims 1 to 4, wherein the fixing screw is made of an insulating material. A through hole is formed in a portion where the wiring pattern of the first surface of the substrate body is formed, and a fastening member is fixed in advance to the second surface opposite to the first surface of the substrate body,
A conductor having a through-hole is formed in contact surfaces, arranged so that the contact surface is in direct contact on the wiring pattern,
Fixing screws, by inserting a screw shaft from the first surface side of the substrate main body so the screw head is disposed on the first surface side and the through hole of the substrate main body and the through hole of the conductor, further wherein A method of manufacturing a wiring board, wherein the wiring pattern and the conductor are connected by fastening with a fastening member and sandwiching the conductor between the screw head and the board body . The surface of the wiring pattern is covered with a resist,
The method of manufacturing a wiring board according to claim 6, wherein the conductor is disposed in a portion of the wiring pattern where there is no resist.

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