JPH11176497A - Laminated circuit board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laminated circuit board for attaining compactness and high density. SOLUTION: Bus bars 14, 15 for constituting the same circuit are disposed and fixed on circuit boards 12, 13 in a laminated circuit board 11. In the bus bar 14, a connection part 18 extended through a through-hole 17 in the circuit board 12 to the bus bar 15 is folded and forded. In the bus bar 15, a connection part 19 extended to the bus bar 14 is folded and formed. By fitting in the connection part 19 to the connection part 18, the bus bars 14, 15 are pressure-welded and connected to each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated circuit board used for an electric junction box installed in, for example, an engine room of an automobile.

[0002]

2. Description of the Related Art Conventionally, a circuit board 41 in an electric junction box is used.
As shown in FIG. 8, a plurality of bus bars 4 arranged on the insulating plate 42 and constituting different circuits are arranged on the insulating plate 42.
3,44. The plurality of busbars 43 and 44 are arranged at a fixed distance from adjacent different circuits in order to eliminate the influence of noise from adjacent different circuits.

[0003]

However, in the above-mentioned conventional circuit board, each bus bar 43, 44 is routed on a single insulating plate 42 without being separated into a plurality of bus bars. It must be routed with a certain distance between the wires 43 and 44. Therefore, the circuit (bus bar) to be routed is complicatedly branched,
As the number of circuits (bus bars) to be routed increases, the insulating plate 42 increases in area, and the circuit board 41 increases in size.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a laminated circuit board capable of achieving high density and high density.

[0005]

In order to achieve the above object, according to the first aspect of the present invention, a plurality of bus bars constituting the same circuit are arranged on a plurality of stacked circuit boards.
The gist is a laminated circuit board in which a plurality of bus bars constituting the same circuit are connected to each other by penetrating the circuit board.

According to a second aspect of the present invention, in the laminated circuit board according to the first aspect, the plurality of busbars connected to each other extend to the other busbar side, and each of the connection portions is press-connected to each other. The point is to prepare.

According to a third aspect of the present invention, in the multilayer circuit board according to the second aspect, at least one of the plurality of connection portions to be connected is a pair of connectors sandwiching the other connection portion. The gist of the present invention is to provide a sandwiching piece.

According to a fourth aspect of the present invention, in the laminated circuit board according to the second aspect, one of the plurality of connection portions to be connected is a pair of connection portions sandwiching the other connection portion. The gist is to be a sandwiching piece.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) FIG. 1 shows a first embodiment in which the present invention is embodied in a laminated circuit board housed in an electric junction box installed in an engine room or the like of an automobile. 3 will be described with reference to FIG.

As shown in FIG. 1, the laminated circuit board 11 comprises
A plurality of circuit boards 12 and 13 made of an insulating plate are provided. On the circuit boards 12, 13, bus bars 14, 15, 16 formed by stamping a metal plate are arranged and fixed. In the present embodiment, the bus bar 14 and the bus bar 15 constitute the same circuit, but are arranged on different circuit boards 12 and 13. Since the plurality of busbars 15 and 16 constitute different circuits, the busbars 15 and 16 are arranged at regular intervals.

A tab portion 14a is bent at one end of the bus bar 14. Tab portions 15a and 16a are bent at one ends of the bus bars 15 and 16, and upper ends thereof are exposed on the circuit board 12 through insertion holes formed in the circuit board 12.

A connection portion 18 extending toward the bus bar 15 through a through hole 17 provided in the circuit board 12 is formed in a part of the bus bar 14 by bending. A connection portion 19 extending toward the bus bar 14 is bent at a part of the bus bar 15. A pair of sandwiching pieces 20 for press-fitting the other connecting section 19 and sandwiching the connecting section 19 from the thickness direction thereof is provided at the distal end of the connecting section 18. At a middle portion between the pair of sandwiching pieces 20, a sandwiching portion 21 slightly narrower than the thickness D1 of the connecting portion 19 is formed. A tapered guide portion 22 for guiding the connecting portion 19 to the holding portion 21 is provided on the end side of the holding piece 20.

The bus bars 14 and 15 forming the same circuit are press-connected to each other by press-fitting the connection portion 19 between the two holding pieces 20 of the connection portion 18. next,
The operation and effect of the present embodiment will be described.

In this embodiment, the bus bars constituting the same circuit are separated into a plurality of bus bars 14 and 15 and arranged on a plurality of circuit boards 12 and 13 respectively. Are connected to each other through a through hole 17. Therefore, even if the bus bars constituting the same circuit are complicated, the plurality of bus bars 14 and 15 can be reduced in size and simplified, thereby suppressing an increase in the area of the circuit boards 12 and 13 and reducing the size and height of the laminated circuit board 11. Density can be increased.

In the present embodiment, a plurality of busbars 14,
15 are arranged on the circuit boards 12 and 13, respectively, and when the two circuit boards 12 and 13 are stacked, the connection portions 18 and 19 are press-connected to connect the bus bars 14 and 15 to each other. The circuit board 11 can be easily configured.

In the present embodiment, the connecting portion 18 of the bus bar 14 is provided with a pair of holding pieces 20 for holding the connecting portion 19 of the bus bar 15, and the connecting portion 19 is provided with the connecting portion 19 on the holding portion 2.
1, the connecting portions 18 and 19 of the bus bars 14 and 15 can be easily press-contacted and connected to each other by the narrow clamping portion 20. 15 can be reliably connected.

Second Embodiment Next, a second embodiment in which the present invention is embodied in a laminated circuit board accommodated in an electric junction box installed in an engine room or the like of an automobile will be described with reference to FIGS. It will be described according to.

FIG. 4 shows a plurality of bus bars 24, 2 arranged and fixed on different circuit boards and constituting the same circuit.
5 is shown. A connection part 26 extending toward the bus bar 25 is formed in a part of the bus bar 24 by bending.

In part of the bus bar 25, the bus bar 2
5 are provided on both sides in the width direction as a pair of sandwiching pieces 27 as connecting portions.
Are bent. The two holding pieces 27 extend toward the bus bar 24 so as to face each other, and the two holding pieces 27 press-fit the connection portions 26 and hold the connection portions 26 from the width direction thereof. As shown in FIG.
Is formed to be convex toward the other holding piece 27 side,
A sandwiching portion 28 having a width slightly smaller than the width dimension D2 of the connecting portion 26 is formed at an intermediate portion thereof. A tapered guide portion 29 for guiding the connecting portion 26 to the holding portion 28 is provided on the end side of both holding pieces 27.

Then, the connecting portion 26 is press-fitted between the sandwiching pieces 27 so that the bus bars 24,
Numerals 25 are press-connected to each other to form a laminated circuit board. Since the present embodiment is configured as described above, the same operations and effects as those of the multilayer circuit board 11 of the first embodiment can be obtained.

(Third Embodiment) Next, a third embodiment in which the present invention is embodied in a laminated circuit board accommodated in an electric junction box installed in an engine room or the like of an automobile will be described with reference to FIGS. It will be described according to.

FIG. 6 shows a plurality of bus bars 31 and 3 arranged and fixed on different circuit boards and constituting the same circuit.
2, both bus bars 31 and 32 are arranged and fixed on a plurality of circuit boards (not shown) constituting a laminated circuit board.

A connection portion 33 extending toward the bus bar 32 is bent at a part of the bus bar 31. Bus bar 3
A pair of sandwiching pieces 34 and 35 as connecting portions extending toward the bus bar 31 are formed in a part of the second section 2 so as to be bent.
Reference numeral 35 is adapted to press-fit the connecting portion 33 to clamp the connecting portion 33 from its thickness direction. The holding piece 34 is provided substantially parallel to the connecting portion 33, and the holding piece 35 is
Are provided so as to intersect. The two holding pieces 27 press-fit the connection portion 26 and hold the connection portion 26 from the width direction thereof. As shown in FIG. 7, a clamping portion 36 having a width slightly smaller than the thickness D1 of the connecting portion 33 is formed at an intermediate portion of the clamping piece 35 on the clamping piece 34 side. On the side, a tapered guide portion 37 for guiding the connection portion 33 to the holding portion 36 is provided.

The connecting portion 3 is provided between the sandwiching pieces 34 and 35.
By press-fitting the busbars 3, the bus bars 31 and 32 constituting the same circuit are pressed and connected to each other to form a laminated circuit board.

Since the present embodiment is configured as described above, the same operations and effects as those of the laminated circuit board 11 of the first embodiment can be obtained. Incidentally, the above embodiment may be modified as follows.

In the first embodiment, the pair of sandwiching pieces 20 of the connecting portion 18 of the bus bar 14 are omitted, and the bus bar 15
A pair of sandwiching pieces 20 may be provided at the connecting portion 19 of the pair, or a pair of sandwiching pieces 20 may be provided at the connecting portions 18 and 19 of the bus bars 14 and 15. Also in this case, the same operation and effect as in the first embodiment can be obtained.

In the second embodiment, the upper bus bar 24 is provided with a pair of sandwiching pieces 27 as a connecting portion, and the lower bus bar 25 is provided with the connecting portion 26. In this case, the same operation and effect as in the second embodiment can be obtained.

In the third embodiment, the upper bus bar 31 is provided with a pair of sandwiching pieces 34 and 35 as connecting portions,
The connection portion 33 is provided on the lower bus bar 32. Also in this case, the same operation and effect as the third embodiment can be obtained.

While the embodiments have been described above, technical ideas other than the claims that can be grasped from the embodiments will be described. (A) The multilayer circuit board according to claim 4 or 5,
A laminated circuit board comprising: a pair of holding pieces each having a holding part narrower than a dimension of the other connecting part; and a guide part for guiding the other connecting part to the holding part. This makes it possible to easily press-connect the connection portions of the plurality of bus bars.

[0030]

As described in detail above, according to the first aspect of the present invention, it is possible to reduce the size and density of the laminated circuit board.

According to the second aspect of the present invention, when a plurality of circuit boards are stacked, a plurality of bus bars can be easily connected by press-connecting the connection portion, and the laminated circuit board can be easily formed. Can be.

According to the third or fourth aspect of the present invention, a plurality of bus bars can be reliably connected by the holding pieces provided on any one of the bus bars.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a laminated circuit board according to a first embodiment.

FIG. 2 is an enlarged sectional view showing a connection state of the bus bar.

FIG. 3 is an enlarged sectional view showing a connection portion of the bus bar.

FIG. 4 is a perspective view showing a bus bar according to a second embodiment.

FIG. 5 is an enlarged sectional view showing a connection portion of the bus bar.

FIG. 6 is a perspective view showing a bus bar according to a third embodiment.

FIG. 7 is an enlarged sectional view showing a connection portion of the bus bar.

FIG. 8 is a perspective view showing a conventional circuit board.

[Explanation of symbols]

12, 13 ... circuit board, 14, 15, 24, 25, 3
1, 32: bus bar, 18, 19, 26, 33: connecting portion, 20: holding piece, 27, 34, 35: holding piece as connection portion.

Claims (4)

[Claims] 1. A laminated circuit board in which a plurality of bus bars constituting the same circuit are arranged on a plurality of laminated circuit boards, and the plurality of bus bars constituting the same circuit are connected to each other through the circuit board. 2. The multilayer circuit board according to claim 1, wherein the plurality of bus bars connected to each other extend to the other bus bar side, and each has a connection portion that is press-connected to each other. 3. The laminated circuit board according to claim 2, wherein at least one of the plurality of connected portions has a pair of holding pieces for holding the other connecting portion. Laminated circuit board. 4. The laminated circuit board according to claim 2, wherein one of the plurality of connected portions is a pair of holding pieces for holding the other connecting portion. Circuit board.