JP2584503Y2 - Flat harness - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat harness (flat electric wire) in which a circuit portion is formed by punching a copper foil such as an FPC (flexible printed circuit), and particularly for a vehicle door. The present invention relates to an improvement of a flat harness that requires a different circuit section depending on a vehicle type such as a harness.

[0002]

2. Description of the Related Art In recent years, a flat harness 1 made of FPC and FWC (flexible wiring circuit) shown in FIG. 4 has been used as a door harness for a vehicle, and a door frame of a door 2 shown in FIG. Door mirror 3a, door lock 3b, step lamp 3c, power window 3 mounted on door 2
d, a plurality of circuit units 4a to 4 provided with electric components such as a door speaker 3e and a power supply (not shown) in the flat harness 1.
e.

The flat harness 1 includes a plurality of circuit portions 4a to 4e provided by punching a sheet-like copper foil integrally with a mold (not shown) as shown in FIG. 1b. Each of the circuit sections 4a to 4e is connected to a connector 5a to 5e, respectively.
Through a conductive member (not shown) of each electrical component.

[0004]

In the above-mentioned door harness, required circuit parts are different depending on the grade of the vehicle. That is, the door mirror 3a and the door lock 3b
Is installed in almost all vehicles. Therefore, a circuit section for connecting to these electrical components, that is, a common circuit section is always necessary, but the power window 3d, the step lamp 3c, the door speaker 3e, etc. are provided depending on the vehicle. In some cases, a circuit section for connecting to these electrical components is not required, and thus becomes an optional circuit.

As described above, the conventional flat harness 1 is formed by punching a plurality of required circuit portions from a copper foil made of one sheet at a time by using a mold.
Therefore, the sheet-shaped copper foil is set to a size necessary for providing the largest number of circuit portions. The die for punching the sheet-shaped copper foil is also large in size according to the size of the sheet.

That is, the door mirror circuit section 4 of the shared circuit section
a and only the door lock circuit section 4b are required,
When the option circuit portion shown in FIG. 3 is also provided, as shown in FIGS. 7A and 7B, the same size sheet-shaped copper foil 6 is used to form the same size roll mold. 7, and is formed by punching.

[0007] Therefore, when only the shared circuit portion as shown in FIG. 7A is required, the copper foil in the portion indicated by cross hatching becomes unnecessary, and the wasteful portion of the copper foil becomes extremely large. is there. Further, there is a disadvantage that the roll mold 7 is enlarged in spite of the small number of required parts.

The present invention has been made in view of the above problems, and aims to reduce the waste of copper foil as much as possible and to reduce the size of a die for punching copper foil, thereby reducing the cost. It is the purpose.

[0009]

In order to solve the above-mentioned problems, the present invention provides a flat circuit made of an FPC or the like in which both sides of a circuit portion formed by punching a copper foil are covered with insulating films.
In the harness, the circuit portion is divided into a shared circuit portion that is always used and an optional circuit portion that can be used as needed, and the shared circuit portion and the optional circuit portion are provided by punching copper foil separately. Another object of the present invention is to provide a flat harness having a configuration in which both sides of each circuit portion are covered with an insulating film and divided into harnesses, and the divided harnesses are used in combination.

The optional circuit section may form a harness independently for each circuit section, or may form a plurality of optional circuit sections that are usually used simultaneously as one harness. In addition, the harness used in combination with the above is connected to the power supply side via one connector by arranging a series of end connection portions connected to the power supply side, as in the case of integrally forming a circuit section. Preferably.

In the case where the flat harness is a door harness, for example, a circuit for a door lock and a circuit for a door mirror are provided as a shared circuit by being integrally punched out of one piece of copper foil, while a circuit for a power window is provided. The circuit section, the door speaker circuit section, and the step lamp circuit section are individually formed by punching out one piece of copper foil as optional circuit sections.

The size of the copper foil for forming the shared circuit portion and each of the optional circuit portions is a size having a minimum area required by each circuit portion. For example, the width is reduced in three stages. Three types of copper foils are prepared, and the three types of copper foils are selectively used according to the size of a circuit portion punched at a time. In addition, the axial length of the punching roll mold is also set to be short according to the width of the copper foil. For example, if three types of copper foil are prepared as described above, There are three types of small dies whose length is gradually reduced. Further, the length required for each circuit portion is also reduced, and thus the length of the copper foil forming each circuit portion can be reduced, and as a result, the diameter of the roll mold can be reduced. Thus, by reducing the axial length and diameter of the roll mold, the roll mold can be reduced in size.

[0013]

As described above, by dividing the circuit section,
The circuit portion formed by punching the copper foil at a time with the mold is reduced, so that the required area of the copper foil can be reduced, and the wasteful portion of the copper foil can be reduced as much as possible. Further, since the area of the copper foil can be reduced, the size of the mold corresponding to the area of the copper foil can also be reduced.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. The same components as those in the related art are denoted by the same reference numerals, and description thereof is omitted. The flat harness shown in FIGS. 1 and 2 is a door harness used for the door 2 shown in FIG. The door harness is a first harness 10 composed of only the shared circuit portion shown in FIG.
It is divided into a second harness 11 and a third harness 12, each of which only includes the option circuit section shown in FIG.

The first harness 10 includes a door mirror circuit section 20 connected to the door mirror 3a shown in FIG.
There is provided only a shared circuit unit including a door lock circuit unit 21 connected to the door lock 3b. The second
The harness 11 includes only an optional circuit unit including a door speaker circuit unit 23 connected to the step lamp 3c shown in FIG. The third harness 12 includes only an optional circuit section including a power window circuit section 24 for connecting the power window 3d and the power supply shown in FIG. 4 and a door speaker circuit section 25 for connecting the door speaker 3e and the power supply. Have.

The circuit portions 20, 2 of the first harness 10
The shared circuit part consisting of 1 and 22 consists of one copper foil as shown in Fig. 2 (A)
Is formed by punching with a roll mold 50 shown in FIG.
The width of the copper foil to be stamped is W1 having a width required for punching, and the length required to form one harness is L1. Since the length L1 is short, a roll die is used. The radius R1 of 50 can be reduced. The roll mold 50
Has a length corresponding to the width W1 of the copper foil.

The circuit portion 23 of the second harness 11 is also formed by punching a single piece of copper foil with a roll mold 51. Therefore, the width of the punched copper foil is the width W2 required for punching. Used. Rolling die for punching 5
Reference numeral 1 also has a length corresponding to the width W2, and has a radius R2 corresponding to the length L2 of the copper foil.

The circuit portions 24 and 25 of the third harness 12
Is formed by punching a single piece of copper foil with a roll die 52. Therefore, the width of the copper foil to be punched is the width W3 necessary for punching, and the roll die 52 for punching is used.
Also, the one having a length corresponding to W3 and having a radius R3 corresponding to the length L3 of the copper foil are used.

The width of the copper foil for forming each of the above-mentioned circuit portions has a relationship of W1>W3> W2, and is thus formed using three types of copper foils having different widths. Further, the length of the copper foil has a relationship of L3>L2> L1, and therefore, the radius of the roll mold is R1 <R2 <R3. The width of the copper foil having the maximum width W1 is approximately half the width of the copper foil 6 shown in FIG. Therefore, the largest roll die for punching a copper foil having a width W1 is also reduced in size to approximately half the conventional roll die.

The first, second and third harnesses 10,
In the same manner as in the conventional example shown in FIG.
6, 27, 28. In addition, connectors 30 to 35 are attached to the end of each circuit section on the connection side with the electrical component.

The divided first to third harnesses 10, 1
As shown in FIG. 3, 1 and 12 are used in combination according to the electrical components attached depending on the grade of the vehicle. FIG. 3A shows a case where only the first harness 10 having a shared circuit portion connected to the door mirror 3a and the door lock 3b attached to the door 2 of any grade of vehicle is used as a door harness. Show. That is, only the first harness 10 is disposed inside the door 2 and used, and the power supply side connector 40 is connected to the power supply side end of the shared circuit portion.

FIG. 3 (B) is used for a vehicle having a door 2 provided with a door mirror 3a and a step lock 3c outside the door lock 3b.
Is used as a door harness. In this case, the connection part on the power supply side is arranged continuously and connected to the power supply side by one connector 41.

FIG. 3 (C) shows a vehicle having a door 2 having a door mirror 3a, a door lock 3b and a power window 3d and a door speaker 3e in addition to the door lock 3b. The first harness 10 and the third harness 12 are used for a vehicle. Are used in combination. FIG. 3 (D) is for a vehicle in which the door 2 is fully equipped with a door mirror 3a, a door lock 3b, a step lamp 3c, a power window 3d, and a door speaker 3e.
The first, second and third harnesses 10, 11, 12 are used in combination. In both cases of FIGS. 3C and 3D, the connection ends on the power supply side are arranged continuously and connected to one connector 42, 43.

The flat harness according to the present invention is not limited to a door harness, but is preferably used in a harness having a circuit that can be used depending on the grade of a vehicle.

[0025]

As is clear from the above description, in the flat harness of the present invention, a plurality of circuit sections are divided into a shared circuit section that is always used and an optional circuit section that can be selectively used as needed. Therefore, the area of the copper foil required to form each circuit portion can be reduced. Therefore, unnecessary portions of the copper foil punched by the mold can be reduced as much as possible, and the waste of the copper foil can be eliminated, and as a result, the cost can be reduced.

Further, since the area of the copper foil is reduced,
The axial length and the radial length of the die for punching the copper foil can be reduced to reduce the size, to reduce the die manufacturing cost, and to reduce the necessity for the die. It has various advantages such as a small space.

[Brief description of the drawings]

FIGS. 1A, 1B and 1C are plan views showing a divided door flat harness of the present invention.

FIGS. 2A, 2B and 2C are schematic front views of a die roll for punching copper foil of a flat harness.

FIGS. 3A, 3B, 3C and 3D are plan views showing the combination of FIGS.

FIG. 4 is a plan view of a conventional door harness.

FIG. 5 is a schematic perspective view showing electrical components provided on a door.

FIG. 6 is a partial cross-sectional view of FIG.

7A and 7B are schematic perspective views showing a conventional method of forming a circuit portion.

[Explanation of symbols]

 2 Door 3a Door mirror 3b Door lock 3c Step lamp 3d Power window 3e Door speaker 10 First harness 11 Second harness 12 Third harness 20, 21, 22 Shared circuit section 23, 24, 25 Optional circuit section

Claims (1)

(57) [Scope of request for utility model registration] 1. A flat circuit made of an FPC or the like in which both sides of a circuit portion formed by punching a copper foil are covered with insulating films.
In the harness, the circuit portion is divided into a shared circuit portion that is always used and an optional circuit portion that can be used as needed, and the shared circuit portion and the optional circuit portion are separately punched with copper foil. A flat harness having a structure in which both sides of each circuit portion are covered with an insulating film, subdivided harnesses are separately formed, and these subdivided harnesses are used in combination.