JPS5828421Y2 - electrical circuit board - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel structure of an electrical circuit board incorporated within an electrical wiring box for centrally interconnecting a wide variety of electrical wiring.

A large number of electrical parts are used in electrical equipment and automobiles that have complex circuit elements, and a harness is generally called a harness to complete an electrical circuit for exchanging information, signals, or power between these electrical parts. The assembled wires are used.

However, since the installation positions of electrical components are often dispersed in various locations, a large number of branch wires are required for the wire assembly, which requires time and effort to manufacture. There is a tendency to widely use a wiring method that attempts to wire parallel wires without branching portions from the junction box by organizing them as a conductive pattern in the junction box.

A typical electrical junction box of this type is one in which multiple circuit boards (generally called printed boards) each having a conductive pattern are stacked together and housed in a casing, and a bus bar is an element of the conductive pattern. The end of the circuit board is exposed from the casing and used as a connector terminal, but most circuit boards used in the past have a conductive pattern formed from bus bars on one side of the insulating board that serves as the substrate. Therefore, in order to prevent the bus bars from intersecting with each other, there is a limit to the variations in the pattern, which greatly limits the degree of freedom in circuit configuration.

In addition, if it is necessary to form a pattern that intersects even if the parts intersect with each other, it is necessary to lift one of the parts that intersect with each other from the insulating board, and since it is not possible to fix the floating part, a sufficient distance must be maintained. As a result, the effective length of the circuit board in the thickness direction increases, which has the disadvantage of occupying a large storage space and making the junction box larger. There were also problems in use, such as the bar warping and causing contact, leading to short circuits.

The present invention was devised after repeated studies to eliminate the defects of conventional electric circuit boards.In particular, bus bars are provided on the front surface of the insulating board, and bus bars are installed on the back surface. A bridge piece for bridging is provided, and a comb-shaped rib is formed on the back surface of the insulating plate, and the bridge piece is interposed in the gap between the comb-shaped ribs. The bus bar is characterized by a configuration in which the bus bar is bridged by bridge pieces in two directions with the bottom surface provided at a predetermined dimension difference higher than the reference plane of the gap.

The specific contents of the present invention will be explained in detail below based on the accompanying drawings.

In each figure, 1 is an insulating plate made of an insulating plate material such as plastic, and busbars 2, 2, etc. are attached to the front side for forming relay parts such as branch circuits, and on the other hand, the back side are provided with bridge pieces 3, 3 for bridging the bus bars 2, 2, etc., and these insulating plates 1
, bus bars 2, 2 and bridge pieces 3, 3 constitute an electric circuit board.

The bus bars 2, 2 are formed by stamping a conductive thin plate, such as a thin copper plate, into an integral molding with a large number of strips extending in the vertical and horizontal directions, and are tightly attached to the insulating plate 1 by means of gluing or embedding. However, in the illustrated example, the ends of the bus bars 2, 2 are straight without being bent and protrude horizontally in parallel in the surface direction of the insulating plate 1, and these protruding parts are connected to the ends of external wiring. A parallel male terminal 5 is formed for engagement with a female terminal.

In addition, in order to prevent each strip from separating during the punching process, it is preferable to take measures such as providing a patch at an appropriate location between adjacent strips and cutting off the patch after the strips are in close contact. In the case where parallel male terminals 5 are provided as in the above-mentioned example, this can be done very simply by providing a connecting piece at the tip of the terminal 5 and cutting this off after assembly is completed.

The bus bar 2゜2, which is in close contact with the insulating plate 1 in this way, has one end or an end branched from the middle part connected to an electric wire via a crimp terminal, as necessary, to connect to an electrical member such as a fuse or relay. It is also possible to do so.

On the other hand, the insulating plate 1 has a smooth surface to which the bus bars 2, 2 are attached, or is arranged in a "first eye" shape with a predetermined gap so that the bus bars 2゜2 can be easily positioned. The bridge piece 3 is formed on a flat surface having small protrusions 6.
, 3 are provided with a large number of comb-shaped ribs 4° 4 vertically or horizontally arranged in parallel with sufficient gaps for the bridge pieces 3, 3 to be interposed therebetween. There is.

The above-mentioned comb-shaped ribs 4, 4 can be easily manufactured by integrally molding them at the same time when molding the insulating plate 1, but the width of the comb between the teeth is made slightly wider than the width of the bridge pieces 3, 3. At the same time, the bottom surface of the comb-like portion is made smaller than the reference surface of the insulating plate 1 by a dimensional difference that is slightly larger than the thickness of the bridge piece 3, for example, 1
The purpose of the present invention can be fully achieved by setting the height to be about 2 pallets higher.

Next, the bridge pieces 3, 3 have the same thickness as the bus bars 2, 2.

A strip of equal width is used, and the bridge piece 3a is arranged so as to be in close contact with the reference surface of the insulating plate 1 in the gap between the comb-shaped ribs 4. It is possible to bridge the bus bars 2, 2 provided on the surface by using the bridge pieces 3b which are perpendicular to each other and attached to and suspended from the bottom of the comb-like part, in two directions with different levels. can.

In order to connect the bridge pieces 3, 3 and the bus bars 2, 2, both ends of the bridge pieces 3, 3 are formed into tapered sharp parts and bent at right angles, and at the same time, attached to the required locations of the insulating part 1. A small hole is punched out together with the bus bars 2, 2 by press processing, and the sharp portion of the bridge pieces 3, 3 is inserted into the small hole, and then the sharp portion and the bus bar 2, 2 are engaged. It can be easily installed by welding the parts together by soldering.

As is clear from the above description, the present invention is based on the insulating plate 1.
The bridge pieces 3, 3 are arranged on the back side of the insulating plate 1, and the bridge pieces 3a, 3b are arranged in two directions at different levels by using the comb-shaped ribs 4, 4 provided on the insulating plate 1. 3 a
, 3 b can bridge the bus bars 2, 2 on the front side, so that the arrangement pattern of the bridge pieces 3, 3 can be arbitrarily set, and also, the bridge pieces 3 a
Even when t3b intersects, the comb-shaped ribs 4, 4
Due to the level difference between the bottom surface of the comb-like part and the bottom surface of the gap part between the lips 4, 4, the separation distance between the two pieces can be maintained sufficiently and stably, allowing for freedom in circuit pattern configuration. This has the effect that a desired circuit can be formed extremely easily.

Furthermore, it has the advantage that circuit changes can be easily made on a circuit board once it has been completed.

In addition, since the comb-shaped ribs 4, 4 also play the role of maintaining strength, the thickness of the insulating board 1 can be made thinner, and the overall effective board thickness can be made equal to that of a conventional circuit board. The present invention is an electric circuit board that is lightweight, saves on materials, requires less space for storing the circuit board, and has a good space factor, and has various practical effects.

[Brief Description of the Drawings] Each figure shows an embodiment of the circuit board of the present invention, in which FIG. 1 is a front view, FIG. 2 is a back view, and FIG. 3 is a vertical bridge in FIG. FIG. 4 is a cross-sectional view taken along the line IV--IV along the line where the lateral bridge pieces are installed. 1...Insulating board, 2...Bus bar 3.
...Bridge piece, 4...Comb-shaped rib.

Claims (1)

[Scope of utility model registration request] Insulating plate 1, bus bars 2, 2 attached to the surface of the insulating plate 1
, consists of bridge pieces 3, 3 disposed on the back surface of the insulating plate 1 to bridge the bus bars 2, 2, and there is a sufficient gap in the insulating plate 1 for the bridge pieces 3, 3 to be interposed therebetween. Comb-shaped ribs 4, 4 are arranged in parallel and have comb-shaped ribs 4, 4 erected on the back surface, and have bottom surfaces in the comb-like portions that are raised by a size difference slightly larger than the thickness of the bridge piece 3 with respect to the reference plane in the gap. The level of the bridge piece 3a disposed in the gap between the comb-shaped ribs 4, 4 and the bridge piece 3b perpendicular to the comb-shaped ribs 4, 4 and suspended in the comb-shaped portion is An electric circuit board characterized in that the bus bars 2, 2 are bridged by bridge pieces 3a + 3b in two different directions.