JPH07307532A - Flat flexible wiring board and grommet wiring structure - Google Patents

Abstract

PURPOSE:To cover a flat flexible wiring board arranged between vehicle main bodies while the damage on it is prevented. CONSTITUTION:A flat wiring board 2, which is formed by covering film material 8 on both surface of a plurality of parallel-arranged wirings 9 and one end side of the film material 8 is laminated separately for each wiring 9, and an inserting part 3, provided with an inserting hole of almost the same shape as the cross section of the laminated part of the flat flexible wiring board 2, and provided and the inserting part 3 is engaged to the inserting hole formed on the door and the vehicle panel. A mounting part 4, provided with an engaging groove to position the flat flexible wiring board 2 without twisting, is formed on the outer circumference of the inserting part in a grommet 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat flexible wiring board and a grommet wiring structure.

[0002]

2. Description of the Related Art Conventionally, for example, in electric wiring of automobiles,
A wire harness in which electric wires are bundled has been used, but in recent years, in order to expand the space inside the vehicle and reduce the weight of the vehicle, it is possible to use a flexible printed circuit (FPC) or a flexible flat cable (FFC) in parallel. A flat flexible wiring board in which both surfaces of a plurality of arranged conductive wires (wiring) are covered with a film material has been used.

Recently, various types of electric components such as an electric power window and an electric door lock, and a flat flexible wiring board for wiring inside a door equipped with a computer for controlling these electric components and wiring for electric components inside the vehicle, especially, Attention has been paid to a method of wiring an FPC.

[0004]

By the way, when connecting the FPC forming the wiring inside the door and the wiring on the vehicle side, it is necessary to cover the FPC between the door and the vehicle body with a grommet so as not to expose the FPC. However, no such grommet for FPC has hitherto been provided.

That is, it has been considered that the FPC cannot be used for a movable portion between the door and the vehicle body because the copper foil is damaged by bending and stretching. Therefore, F
After the PC was connected to the wire harness in the door via the connector, the wire harness had to be connected to the vehicle body side, resulting in poor workability and insufficient weight saving. The wire harness located between the door and the vehicle body is covered with a conventionally known grommet.

Further, as described above, since a plurality of electric components are mounted in the door and the number of circuits of the FPC needs to be increased, it is necessary to expand the FPC two-dimensionally. As a result of the occupied space becoming large in the exposed portions between the main bodies, the grommet covering the FPC also becomes large, which is not desirable in appearance.

In view of the above problems, it is an object of the present invention to provide a wiring structure for a flat flexible wiring board and a grommet which can be appropriately covered while preventing damage to the flat flexible wiring board.

[0008]

To achieve the above object, in the invention according to claim 1, both sides of a plurality of wirings arranged in parallel are covered with a film material, and one end side of the film material is wired. Other than that, the flat flexible wiring board is separated and laminated, and a grommet having an insertion portion having an insertion hole having substantially the same shape as the cross section of the laminated portion of the flat flexible wiring board.

According to a second aspect of the invention, the insertion portion is
The flat flexible wiring board has a non-twisted structure that bends and stretches without twisting.

According to the third aspect of the present invention, an attachment portion having an engagement groove that engages with the peripheral edge of the through hole formed in the attachment member is formed on the outer periphery of the insertion portion.

According to a fourth aspect of the present invention, the member to be attached is an outer plate of a vehicle door and a vehicle body, and the engagement groove is formed long in a direction orthogonal to an opening / closing direction of the door. The door and the outer plate of the vehicle body are formed so as to be engaged with through holes formed in the outer plate.

According to the fifth aspect of the invention, a seal portion is formed on the inner surface of the insertion hole of the insertion portion so as to mesh with each other and hold the flat flexible wiring board.

According to a sixth aspect of the invention, at least one end side opening of the insertion portion is held by a clip together with a flat flexible wiring board.

[0014]

According to the structure of the invention described in claim 1, when the grommet is expanded and the flat flexible wiring board is inserted, and then the expanded state of the grommet is released, the flat flexible wiring board has the grommet. The inner surface of the insertion hole of is in close contact.

According to the structure of the second aspect of the present invention, since the non-twisted structure is formed on the grommet in the use state even when an external force acts, the flat flexible wiring board to be inserted is twisted. Flex without stretching.

According to the third aspect of the invention, the grommet engages the engaging groove of the attaching portion with the peripheral edge of the through hole of the attached member while the flat flexible wiring board is inserted. As a result, it is attached to the attached member.

According to the structure of the fourth aspect, when the grommet is mounted between the door and the vehicle body and the door is opened and closed, the flat flexible wiring board inserted through the grommet is not twisted. Bend over.

According to the fifth aspect of the present invention, the flat flexible wiring board is sandwiched in a serpentine state on the inner surface of the insertion portion of the grommet due to the engagement of the seal portions, the contact area becomes large, and depending on whether the door is opened or closed. Do not move.

According to the structure of the sixth aspect of the invention, the flat flexible wiring board inserted into the insertion portion of the grommet is pinched by the clip to prevent displacement.

[0020]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a perspective view showing a state in which an FPC 2 which is one of flat type flexible wiring boards is inserted into the grommet 1, and is used between a door A and a vehicle body B. The grommet 1 is made of an elastic material such as rubber and has an insertion portion 3 and
It is composed of a flange-shaped mounting portion 4 projecting from the outer periphery of both sides of the insertion portion 3.

The insertion portion 3 has a substantially circular insertion hole, and the inner surface of the insertion portion 3 is in close contact with the strip portion 8b on one end side of the laminated FPC 2 as described below. However, it is preferable that the shape of the insertion hole is smaller than the cross-sectional shape of the laminated strip portion 8b, and that the inner surface of the insertion hole has a similar shape such that the inner surface is crimped to the outer surface of the laminated strip portion.

A bellows-shaped expandable portion 5 is formed on the outer periphery of the insertion portion 3 between the attachment portions 4. This elastic part 5
When the insertion portion 3 is arranged between the door A and the vehicle body B, the insertion portion 3 can be easily bent and extended with respect to opening and closing of the door A.

Further, as shown in FIG. 4, a corrugated seal portion 6 is formed on the inner surface of one end of the insertion portion 3 (a portion slightly protruding from the mounting portion 4), and each seal portion 6 is formed. The area of contact with the FPC 2 is increased by the meshing of the peaks and valleys. As a result, the displacement of the FPC 2 in the insertion portion 3 is effectively prevented. The FPC 2 has high strength in the direction in which it is bent by the seal portion 6, and there is no risk of damage.

The mounting portion 4 is adapted to be mounted in each through hole formed in the outer plates of the door A and the vehicle body B, respectively. That is, the engaging groove 7 is formed in the outer peripheral portion of the mounting portion 4 along the circumferential direction, and the edge portion of the through hole is engaged in the engaging groove 7. In this case, the mounting direction of the FPC2 is FP with respect to the opening / closing of the door A.
This is the direction in which C2 does not twist.

The FPC 2 has a structure in which a wiring layer 9 composed of a plurality of conductors is arranged in parallel along a longitudinal direction of a film material 8 having a substantially strip-like insulating property. As shown in FIG. 3A, a plurality of slits 8a are provided in the longitudinal direction on one end side of the film material 8 and are separated for each wiring layer 9 to form a total of five strip portions 8b. ing. A step is provided in the length of the strip portion 8b, and as shown in FIG. 3 (b), when the strip portions 8b located on both sides of the strip portion 8b are sequentially bent and laminated, the leading end surfaces are aligned. Is formed. The length of the laminated portion is set so that the projection size of the FPC 2 has a desired value when the FPC 2 is inserted into the insertion portion 3.

Grommet 1 and FPC having the above structure
The work of assembling the second door A and the vehicle body B will be described. That is, first, from the state shown in FIG.
The FPC by expanding means (not shown).
The strip portion 8b on the one end side of 2 is laminated.

Then, from the opening on one end side of the insertion portion 3 to the FP
After inserting C2 to a predetermined position, the expanding means is removed to restore the grommet 1 to its original shape as shown in FIG. As a result, the laminated strips of the FPC 2 are held in close contact with each other by the inner surface of the insertion portion 3. In this state, the FPC 2 has a large contact area due to the seal portion 6 and is not displaced.

As shown in FIG. 5, the grommet 1 thus inserted through the FPC 2 has its mounting portions 4 engaged with the edges of the through holes formed in the door A and the vehicle body B, respectively. It is arranged between the door A and the vehicle body B.

In this mounted state, only the compact grommet 1 through which the FPC 2 is stacked is exposed between the door A and the vehicle body B, and even the FPC 2 having a plurality of circuits is exposed. Does not spoil the appearance. Further, the FPC 2 is arranged in the direction having the highest strength with respect to the opening / closing direction of the door A, and the FPC 2 bends and stretches without being twisted, so that the wiring layer 9 does not peel off.

In the above embodiment, the FPC 2 is positioned with respect to the grommet 1 by the sandwiching pressure of the seal portion 6. However, the tongue piece is extended from the film material 8 of the FPC 2 and the tongue piece is grommetted. You may make it lock to 1. As this locking structure, a locking hole is provided in the tongue and a locking projection is provided on the grommet 1, a structure using only an adhesive, welding or the like is conceivable.

In addition to the above, the positioning shown in FIG.
The clip 10 shown in can be used. In this clip 10, one end side of a pair of substantially U-shaped holding pieces 11 is connected by a connecting portion 12, and a locking hole 14 is formed in an extension portion 13 provided at the other end portion of one holding piece 11. The locking claw 1 provided at the other end of the other holding piece 11 is provided in the locking hole 14.
5 is locked. Then, in the locked state, the opening on the one end side of the grommet 1 is pinched by the holding piece 11, and the displacement of the FPC 2 is prevented. In this case, as described above, a tongue piece may be extended from the FPC 2, and the tongue piece may be sandwiched and positioned between the grommet 1 and the clip 10.

Further, in the above-mentioned embodiment, the case where the grommet 1 is arranged between the door A of the automobile and the vehicle body B has been described, but other electric components such as the front portion of the vehicle interior and other electrical equipment such as OA equipment are also described. It may be used for electrical connection of products. However, in this case, the mounting portion 4 is not always necessary, but it is preferable to provide the grommet 1 itself with a structure in which the FPC 2 to be inserted is bent and stretched without being twisted. That is,
It is necessary to provide a non-twisted structure such as thickly forming the insertion portion 3 of the grommet 1 other than the portion in contact with the front and back surfaces of the laminated portion of the FPC 2.

Furthermore, in the above embodiment, one end side of the FPC 2 is divided for each wiring layer 9, but FIG.
As shown in (a) and (b), it may be divided into two, and may be divided and laminated so as to have an appropriate width dimension as needed.

[0034]

As is apparent from the above description, in the invention described in claim 1, since the flat flexible wiring board is inserted into the grommet in a close contact state, the flat flexible wiring board is appropriately protected. , Will not be damaged.

According to the second aspect of the present invention, since the grommet has a non-twisted structure, even if an external force is applied, the flat flexible wiring board bends and stretches without twisting, and the wiring layer peels off. Problem does not occur.

According to the third aspect of the present invention, since the mounting portion having the engaging groove is formed on the grommet, the mounting can be easily performed only by forming the through hole in the mounted member.

According to the fourth aspect of the invention, the flat flexible wiring board is arranged between the door and the vehicle body so that the conductive layer bends and stretches without being twisted.
Even if the flat flexible wiring board is repeatedly bent and stretched by opening and closing the door, the conductive layer is not damaged.

In the invention of claim 5 or 6, since the flat flexible wiring board is prevented from being displaced from the grommet by the seal portion or the clip, there is a problem that the conductive layer of the flat flexible wiring board is peeled off. It can be prevented.

[Brief description of drawings]

FIG. 1 is a perspective view of an FPC and a grommet according to this embodiment.

FIG. 2 is a perspective view showing an assembled state of FIG.

FIG. 3 is a perspective view of the FPC of FIG.

FIG. 4 is a partial cross-sectional view of FIG.

5 is a perspective view showing a mounted state of the grommet of FIG. 1. FIG.

FIG. 6 is a perspective view of a clip.

FIG. 7 is a perspective view of another FPC.

[Explanation of symbols]

 1 Grommet 2 Flat Flexible Wiring Board 3 Insertion Part 4 Mounting Part 7 Engagement Groove 8 Film Material 9 Wiring Layer

Claims (6)

[Claims] 1. A flat flexible wiring board in which both surfaces of a plurality of wirings arranged in parallel are covered with a film material, and one end side of the film material is separated and laminated except for the wiring, and the flat flexible wiring board. A wiring structure for a flat flexible wiring board and a grommet, comprising: a grommet having an insertion portion having an insertion hole having substantially the same shape as the cross-section of the laminated portion of the wiring board. 2. The wiring structure according to claim 1, wherein the insertion portion has a non-twisted structure in which the flat flexible wiring board bends and extends without being twisted. 3. The wiring according to claim 1, wherein an attachment portion having an engagement groove that engages with a peripheral edge of a through hole formed in the attached member is formed on an outer periphery of the insertion portion. Construction. 4. The mounted member is an outer plate of a vehicle door and a vehicle body of a vehicle, and the engagement groove is formed long in a direction orthogonal to an opening / closing direction of the door. The wiring structure according to claim 1, wherein the wiring structure is formed so as to be engaged with a through hole formed in the outer plate. 5. The wiring structure according to claim 1, wherein a seal portion that meshes with each other and holds the flat flexible wiring board is formed on an inner surface of the insertion hole of the insertion portion. . 6. The wiring structure according to claim 1, wherein at least one end side opening of the insertion portion is held by a clip together with a flat flexible wiring board.