JP3448478B2 - Joint circuit board - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint circuit board, and more particularly, to a joint circuit board used for connecting a flat cable. [0002] In electronic equipment and automobiles, for example,
A so-called flat cable in which a flat flat conductor is covered with an insulating material is known as a cable for connecting a control unit to auxiliary equipment or the like to be controlled. Since this flat cable is flat and thin, it is suitable for wiring in a narrow space. [0003] A distribution board has conventionally been used for connecting the control unit to auxiliaries and the like. This distribution board has a ground circuit and a plurality of transmission circuits formed on the board. And the distribution board is on one side
The control unit with connected main flat cable, And
The control unit and the accessories are connected to the respective accessories and the like by branch flat cables connected to the other side . [0004] By the way, in the auxiliary equipment and the like, the positional relationship between the electric transmission circuit and the ground circuit and the electric transmission terminal in the auxiliary equipment and the like are changed due to rearrangement or change of adopted parts. The positional relationship with the ground terminal may be reversed. In such a case, in order to connect the distribution board to the auxiliary equipment and the like by the flat cable, the flat cable must be twisted or bent to exchange the positional relationship. However, when the flat cable is twisted, the flat cable swells in the thickness direction, making it difficult to perform wiring in a narrow space and making it impossible to utilize the advantages of the flat cable. Also, if the flat cable is bent to change the positional relationship of the circuit, it does not expand much in the thickness direction, so there is no problem in wiring to a narrow space. The position of the cable is shifted, and the tip of the flat cable is
In some cases, the vehicle may reach a displaced position, and it may be difficult to connect a control unit mounted in a narrow space to accessories and the like. The present invention solves the above-mentioned problem in wiring using a flat cable, and enables a flat circuit to be wired without twisting or bending the flat cable even if the positions of terminals in auxiliary equipment are reversed. The purpose is to provide. [0007] Means for Solving the Problems] joint circuit board of the present invention in order to achieve the above object, a substrate, on the substrate
Comprising <br/> a ground circuit and a plurality of electrical transmission circuits are respectively wire, the electrical transmission circuit alone contacts at one end
Part or a pair of branches provided at each of the branched ends.
One of the branch contact portions, and the transmission circuit
Has the single contact portion, the ground circuit
It has a contact portion that is placed with the single contact
And wherein the transmission circuit has the pair of branch contact portions.
The ground circuit is disposed between the pair of branch contact portions.
Contact portion . An embodiment of the present invention will be described with reference to FIGS. 1 and 2. Joint circuit board (hereafter,
The “circuit board” 1 is, as shown in FIG.
The board 2 and the transmission circuits 3, 4, 5 provided on the board 2
And a ground circuit 6. The substrate 2 includes a rectangular plate having electrical insulation and flexibility, on which a transmission circuit 3, 4, 5 and a ground circuit 6 having a predetermined shape, which will be described later, are disposed. It is sandwiched between two sheets having electrical insulation and flexibility. Here, the plate and sheet are
For example, it is made of polyester resin, polyolefin resin or polyvinyl chloride resin. Transmission circuits 3, 4, 5 and ground circuit 6
Is made of an electric conductor, for example, a thin copper plate.
As shown in (a), the sheet on the upper surface of the substrate 2 is peeled into a square shape, and the contact portions S and G exposing the copper plate are formed. Here, in FIG. 1A, the circuit board 1
A branch flat cable for electrically connecting auxiliary equipment and the like to the transmission circuits 3, 4, 5 and the ground circuit 6 on the right side,
A main cable for electrically connecting the control unit to the transmission circuits 3, 4, 5 and the ground circuit 6 on the lower side is respectively connected. Therefore, for convenience of description, in the following description, the right side of the board 2 is referred to as an auxiliary machine side SA, and the lower side of the board 2 is referred to as a control side SC. The circuit board 1 configured as described above is used as follows when a seat sensor for a vehicle seat is connected to a control unit (not shown). First, a main cable (not shown) from the control unit is connected to the control side SC of the board 2. At this time, the end of the main cable exposes the conductor, and is connected to the corresponding transmission circuits 3, 4, 5 and the ground circuit 6 by resistance welding or ultrasonic welding. Note that a connector may be attached to the control side SC and connected to the main cable by the connector. Next, as shown in FIG. 2, branch flat cables 10 to 12 are connected to the auxiliary machine side SA. At this time, the positional relationship between the power terminals S and the ground terminals G of the corresponding seat sensors 15 to 17 and the contact portions G and S on the substrate 2 is confirmed. For example, in FIG.
The power terminal S is on the upper side and the ground terminal G is on the lower side. Accordingly, in the branch flat cable 10, the transmission line 10a is connected to the contact portion S on the auxiliary machine side SA of the board 2, and the ground line 10b is connected to the contact portion G in the same manner, and is connected to the transmission circuit 3 and the ground circuit 6. On the other hand, the seating sensor 16 is
The power terminal S is on the lower side, and the ground terminal G is on the upper side. Therefore, the branch flat cable 11 connects the power transmission line 11a to the contact S on the auxiliary machine side SA of the board 2 and the ground line 11b to the upper contact G, respectively, to the transmission circuit 4 and the ground circuit 6. . Similarly, the branch flat cable 12 connects the transmission line 12 a to the auxiliary machine side S of the board 2.
The ground wire 12b is connected to the transmission circuit 5 and the ground circuit 6 in correspondence with the contact point S of A and the contact point G on the upper side, respectively. As described above, since the contact portions S and G to be connected can be arbitrarily changed according to the positional relationship between the power terminal and the ground terminal on the auxiliary machine side, the circuit board 1 is flat to match the positional relationship. No need to twist or bend cables. For this reason, it is possible to maximize the thinness, which is an essential advantage of the flat cable, and to lay the flat cable in a narrow space without any trouble. Therefore, the circuit board of the present invention exerts an excellent effect when used for wiring in an automobile, for example, wiring on the back side of an instrument panel or an interior material or an electric seat. Incidentally, the auxiliary equipment in the present invention is not limited to the above-mentioned seating sensor, but may be, for example, a buckle switch, a vibrator, a seat heater, or the like.
An auxiliary machine such as a motor for driving an electric seat is exemplified. In particular,
When driving a plurality of electric seat driving motors individually, as shown in FIG. 3, a circuit board 30 having circuit patterns 31, 32, and 33 respectively corresponding to the motors 34, 35, and 36 may be used. At this time, the circuit board 30
Connection between the motor and the motors 34, 35, 36
, Flat branch cables 10, 11, 1
2 is used. By the way, when wiring to the electric seat driving motor is performed, the flat cables 10, 11, and 12 are wired with a certain degree of bending since the motor moves together with the seat. At this time, if the flat cables 10, 11, 12 are twisted,
In some cases, the bending portion does not bend properly, and the moving amount of the motor portion cannot be sufficiently absorbed, or the twisted portion is bitten or pinched by the movable portion of the sheet.
However, according to the circuit board of the present invention, since the flat cables 10, 11, and 12 need not be twisted, occurrence of such a problem can be suppressed. Here, the circuit board of the present invention is shown in FIG.
As shown in a circuit board 20 shown in FIG. 1, one end of each of the transmission circuits 22, 23, and 24 formed on the substrate 21 is bifurcated, and a ground circuit 25 enters between the two branched transmission circuits. Is also good. In addition, a circuit pattern in which a transmission circuit enters between two ground circuits and a circuit pattern in which a ground circuit enters between two transmission circuits may be mixed in one circuit board. That is, a circuit pattern on the circuit board 1,
The circuit patterns on the circuit board 20 may be mixed on one circuit board. Since the circuit board 1 has flexibility, it can be easily bent, and is suitable for use in a bent portion or a bent portion. However, the circuit board of the present invention is not limited to a flexible board, but may be a rigid board. Since this circuit board can hold its shape by itself, it is suitable for use by attaching it to a desired position using screws or the like in the device. In the above description, FIG.
Although only the circuit pattern shown in (b) has been described, the circuit board of the present invention is not limited thereto, and is not limited to these, and may be a transmission circuit sandwiched between two ground circuits or between two transmission circuits. Any circuit pattern may be employed as long as the ground circuit is provided, and the connected auxiliary machine is not limited to the vehicle seat. Further, when the circuit board of the present invention is used, even if the flat cable must be bent and used, the contact portions S and G can be arbitrarily changed, so that the number of times of bending can be minimized. In addition, adverse effects due to bending can be minimized. In addition, if a caulking terminal that pierces the sheet of the substrate and is connected to the circuit is used, the contact portions S and G may not be provided. As is apparent from the above description, the joint circuit board of the present invention has a positional relationship of contacts with respect to signals and ground lines of auxiliary equipment and the like connected via a flat cable. Even so, the contact portions of the transmission circuit and the ground circuit to be connected to the flat cable can be appropriately changed, so that it is not necessary to twist or bend the flat cable. For this reason, the restriction on wiring to a narrow space can be eliminated. In addition, there is no restriction on the arrangement and design changes on the auxiliary equipment side, and the degree of design freedom is increased.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view showing a configuration of a joint circuit board according to the present invention. FIG. 2 is a plan view showing an embodiment in which a seating sensor is connected to a joint circuit board according to the present invention using a flat cable. FIG. 3 is a plan view showing a mode in which a motor is connected to the joint circuit board according to the present invention using a flat cable. DESCRIPTION OF SYMBOLS 1 Circuit board 2 Boards 3, 4, 5 Transmission circuit 6 Ground circuits 10, 11, 12 Flat branch cable 20 Circuit board 21 Boards 22, 23, 24 Transmission circuit 25 Ground circuits 34, 35, 36 Motor SA Auxiliary equipment side

Continuation of front page (56) References JP-A-7-15106 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01R 31/02 H01R 12/04 H05K 1/14

Claims (1)

(57) provided with Patent Claims 1. A substrate, a ground circuit and electrical transmission circuits are wired respectively on the substrate, the electrical transmission circuit alone contact portion at one end thereof, walk
Is a pair of branch contacts provided at each of the branched ends
If the transmission circuit has the single contact portion, the
Circuit has a contact portion disposed so as to sandwich the single contact.
In the case where the transmission circuit has the pair of branch contact portions,
The ground circuit is disposed between the pair of branch contact portions.
A joint circuit board having a contact portion .