JP2770624B2 - Flat cable connection method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of connecting a flat cable for wiring between circuit conductors of a flexible flat cable used for wiring of OA equipment and automobiles, so-called FPC.

[0002]

2. Description of the Related Art In this type of flat cable, a circuit pattern is formed by a circuit conductor made of rolled copper foil, electrolytic copper foil, or the like on an insulating film such as polyimide or polyethylene terephthalate. It is the structure which stuck.

[0003] Therefore, such a flat cable has flexibility, and since circuit conductors are patterned on a film, it is easy to carry out wiring, and it is often used particularly for connection between complicated circuits and devices. I have. Japanese Unexamined Utility Model Publication No. 2-16586 discloses this flat cable connector.
There are those disclosed in Japanese Utility Model Laid-Open No. 2-16587 and Japanese Utility Model Laid-Open No. 2-16588.

[0004]

However, according to this kind of conventional connector, as shown in FIG. 9, opposing circuit conductors 101a,
101b, 101c, 101d, 101e, 101f,
Only connection between 101g and 101h is possible.
Circuit conductors 101a, 101b, 10 as shown in FIG.
1c, 101d, 101e, 101f, 101g, 10
Wiring connection such as 1h intersecting, that is, cross wiring connection could not be made.

[0005] In particular, since a wire harness for an automobile has a larger number of circuits than an OA device and also has a branch circuit, an attempt is made to process cross wiring and the like on a single flat cable 101 using the flat cable 101. Then, as shown in FIG. 11, the circuit conductors 101a, 101b, 101c, and 101d cannot be arranged in an intersecting manner in a middle portion of the flat cable 101 because they are formed in a planar manner. Therefore, as shown in FIG. 12, a detour 102 is formed at the ends of the circuit conductors 101a, 101b, 101c, and 101d of the flat cable 101, and the detour 102 is bent to oppose the circuit conductors 101a, 101b,
101c, 101d, 101e, 101f, 101g,
A method of connecting the 101h with each other has been adopted.

However, according to this method, the presence of the bypass circuit 102 requires a large amount of material for the flat cable 101 itself, resulting in high costs and unreasonable circuit design. There was a disadvantage that it was inferior.

Therefore, the flat cable 10 is
It is preferable to perform processing such as cross-wiring at the joint portion of No. 1 and a method of connecting the flat cable 101 capable of cross-wiring has been desired.

In view of the above problems, the present invention enables wiring connections where circuit conductors intersect each other in a flat cable connecting portion, and furthermore, the required amount of the flat cable itself can be reduced, and cost reduction can be achieved. It is an object of the present invention to provide a flat cable connection method that can easily perform a flat cable circuit design.

[0009]

The technical means for achieving the above object is to expose the ends of the circuit conductors of the respective flat cables which are wired and connected to each other, and to print the exposed circuit conductors of the respective flat cables. each contacting directly the circuit conductor on the board, wiring connected to each other through the circuit conductor on the printed circuit board to circuit conductors of the respective flat cables by maintaining this contact state flash
In the connection method of the cable, the printed circuit board is fitted.
A case body formed with a fitting recess to be removably fitted,
A cover body that is fitted over the fitting recess.
For the lint substrate, use flat cables on both sides of the flat substrate.
The circuit conductors have a corresponding spacing with each circuit conductor
As the circuit pattern is formed, both the front and back circuit patterns
Are connected to each other by through-hole structures,
On both sides of the flat board
Guide ridges are projected from the
On both opposing surfaces corresponding to the front and back surfaces of the
Cable fitting groove into which flat cable end is fitted
As well as the corresponding guide ridges on the printed circuit board.
Guide grooves into which the guide ridges fit.
Are provided at the periphery of the fitting recess of the case body.
Projections for positioning the flat cable.
And an engaging portion for mounting the cover body is provided,
When mounted on the cover body so as to cover the fitting concave portion
A fitting hole into which each of the protrusions is fitted.
And the engaged portion which is removably engaged with the engaging portion is
The insulating film on one side at the end is
Removed along the circumference and at the position corresponding to the protrusion
Form a hole to define the end of each circuit conductor.
Connect the end of the rat cable to the exposed side of each circuit conductor.
To each cable mating groove of the case so that
Into the positioning holes of each flat cable.
After fitting each projection, fit the printed circuit board into the fitting recess
Then, the cover body is attached so as to cover the fitting recess .

A printed circuit board having a structure in which circuit conductors are cross-wired may be used.

[0011]

According to the present invention, the end of each flat cable is
The insulating film on one side
And a positioning hole corresponding to the protrusion is formed.
Of each flat cable with the end of each circuit conductor exposed
Make sure that the exposed ends of each circuit conductor face each other
When fitted into each cable fitting groove of the case,
Each projection into the positioning hole of each flat cable.
The printed circuit board into the fitting recess
Then, cover the fitting recess and attach the cover body.
The exposed circuit conductor at the end of each flat cable.
Direct contact with the circuit conductors on the lint board
The contact state can be maintained, where the printed circuit board
Through the upper circuit conductor, the circuit conductor of each flat cable
These are electrically connected to each other.

If a printed circuit board having a structure in which circuit conductors are cross-wired is used, cross-connecting wiring connections between circuit conductors of each flat cable can be easily obtained.

[0013] Therefore, the circuit design of the flat cable can be simplified, the design of a detour or the like becomes unnecessary, and the amount of the flat cable itself can be reduced.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to the accompanying drawings. In FIGS. 1 to 6, reference numeral 1 denotes a flat cable, which is made of copper foil on an insulating film 2 of polyimide or polyethylene terephthalate as in the prior art. A circuit pattern is formed by the circuit conductor 3 and an insulating film 2 is further laminated thereon.

5 is a printed circuit board (so-called PCB),
A circuit pattern is formed by a circuit conductor 7 made of copper foil on both front and back surfaces of a flat substrate 6 made of paper phenol, glass epoxy, or the like, and both the front and back circuit patterns are connected to each other by a through-hole structure 8. The circuit conductors 7 of this circuit pattern are arranged at intervals corresponding to the circuit conductors 3 of the flat cable 1 and are configured so as to form a so-called cross wiring structure on the front and back sides. A resist film 9 is applied over a predetermined range on the front and back of the printed circuit board 5 so that the layers 3 and 7 do not contact each other. Further, guide protrusions 10 are provided on both side end surfaces of the substrate 6 so as to protrude in the vertical direction.

Reference numeral 12 denotes a resin case body, on the upper surface of which is formed a fitting recess 13 into which the printed board 5 is removably fitted. A vertical guide groove 14 corresponding to the strip 10 is provided. Cable fitting grooves 15 into which the ends of the flat cable 1 are fitted are respectively formed on both sides of the fitting recess 13 corresponding to the front and back surfaces of the printed circuit board 5.
Are formed. Furthermore, the fitting recess 1 of the case body 12
A pair of projections 16 for positioning the flat cable 1 are respectively provided on the upper surface located at the three peripheral edges, and engagement projections 17 as engagement portions are respectively provided on the outer surface of the case body 12. Have been.

Reference numeral 19 denotes a cover body made of resin.
6. A fitting hole 20 into which each projection 16 is fitted at a position corresponding to 6.
And an engaging piece 21 as an engaged portion that is removably engaged with the engaging projection 17 by elastic deformation when the fitting is detachably fitted to the upper end portion of the case body 12. ing.

In order to perform the wiring connection between the flat cables 1, as shown in FIG. 4, the insulating film 2 on one side at the end of each flat cable 1 is removed over a predetermined range, and the projections 16 and A corresponding pair of positioning holes 23 are formed at predetermined positions, and each circuit conductor 3
Expose the end of

Next, as shown in FIG. 1, the ends of the flat cables 1 are fitted into the cable fitting grooves 15 of the case body 12 such that the exposed sides of the circuit conductors 3 face each other. The printed circuit board 5 is fitted in the guide groove 13 under the guidance of the guide protrusion 10 by the guide groove 14. In this case, each
Since each projection 16 is fitted in the positioning hole 23, each flat cable 1 is positioned at a predetermined position by each projection 16, and the printed circuit board 5 is inserted into the printed cable 1 as shown in FIGS. 5 and 6. A state where the board 5 is fitted into the fitting recess 13 is obtained. Here, the circuit conductors 7 disposed on one side of the printed board 5 are directly pressed into contact with the circuit conductors 3 of one flat cable. And the respective circuit conductors 7 disposed on the other side of the printed circuit board 5 are in direct contact with the respective circuit conductors 3 of the other flat cable 1 in a press-contact manner.
Through this, the circuit conductors 3 of both flat cables 1 are wired and connected in an intersecting manner, and a cross wiring state as shown in FIG. 10 is obtained.

Thereafter, when the cover body 19 is fitted and mounted on the upper end of the case body 12, each projection 16 is fitted into each fitting hole 20 and each engagement projection 17 is fitted to each engagement piece 21. It is engaged and held, and the wiring connection state is maintained here.

According to the above method, the flat cable 1
In the connection part, the wiring connection where the circuit conductors 3 intersect with each other can be easily obtained, a special design such as a detour is not required on the flat cable 1 side, and the amount of the flat cable 1 itself can be reduced. The circuit design of the flat cable 1 can be simplified, the circuit design can be simplified, the versatility is excellent, and the production cost can be reduced.

In addition , by changing the circuit of the circuit conductor 7 provided on the printed circuit board 5 in which various wiring structures can be easily manufactured, various cross wirings and connection between the circuit conductors 3 facing each other as in the related art can be performed. Can also. In addition,
For fitting one end of the flat cable into the mating groove 15
Therefore, the printed circuit board 5 is
When inserting the flat cable 1 into the guide groove 14
Positional displacement such as entrapment can be effectively prevented, and
The work of inserting the plate 5 can be facilitated and the circuit conductors 3 and 7 can be inserted.
A good connection between them can be ensured. Also positioning
Projection 16 in the positioning hole 23 of the flat cable 1
Since the fitting method is adopted, the fitting recess 13
When the printed circuit board 5 is inserted, the flat cable 1 is inserted.
The flat cable 1
Where the circuit conductor 3 is not exposed and the printed circuit board 5
Effectively prevent contact with
When a tensile force acts on the flat cable 1
Even if there is, the flat cable 1 side and the printed circuit board 5 side
No direct tensile stress on the contact area
There is also an advantage. Furthermore, when attaching the cover body 19,
Then, the printed circuit board 5 is fitted to a predetermined position of the fitting recess 13.
If not, each positioning projection 16 is
The engaging projection 17 and the engaging piece 2
1 cannot be obtained.
There is also an advantage that the fitted state can be easily detected.

FIG. 7 shows a second embodiment. For example, a fitting concave portion 13 into which the printed circuit board 5 is fitted is directly provided in a molded component 25 as a case body such as an instrument panel of an automobile, and the molded component 25 is directly flattened. The structure is such that the cable 1 is attached. In this case, the flat cable 1 is configured to be positioned by the cable fitting groove 15.

FIG. 8 shows a third embodiment, in which an H-shaped notch 26 is formed on the flat cable 1.
Each flat cable piece 1 facing each other at the notch 26
It is carried to a wiring connection of circuit conductor 3 between a mutual rather good, this
In the case of, even in a single flat cable 1
Wiring can be connected.

[0025]

According to the flat cable connection method of the present invention, the fitting recess into which the printed board is removably fitted.
Is mounted over the case body formed with
And a cover body, wherein the printed board is a flat board.
Between the corresponding conductors of the flat cable on both sides
When a circuit pattern is formed by circuit conductors with a gap
Both front and back circuit patterns have through-hole structure respectively
Therefore, they are connected to each other and
Guide ridges are protruded along the insertion direction, respectively.
Corresponds to the front and back sides of the printed circuit board in the fitting recess
Flat cable ends are fitted on both sides
Cable fitting groove is formed, and the printed
Each guide ridge is located at a position corresponding to each guide ridge on the plate.
A guide groove to be fitted into the case body;
Positioning the flat cable at the periphery of the fitting recess
Projections are provided respectively, and the cover body
A wearing engagement portion is provided, and the cover body has the fitting recess.
The fitting into which each of the protrusions is fitted when mounted over the portion
A mating hole is provided for each, and
The engaged part is provided, and one side of the end portion is provided.
While removing the insulating film of a predetermined range,
Forming positioning holes corresponding to the protrusions, each circuit conductor
Remove the end of each flat cable with the exposed end
Make sure that the exposed side of each circuit conductor faces each other
Fit each cable mating groove and flat
After fitting each projection into the cable positioning hole,
Board into the fitting recess, and then cover the fitting recess.
Mounting the cover Te is a method, for fabrication of various wiring structure utilizing easy PCB, cross line
Each printed circuit board is provided with a printed circuit conductor.
Wiring connections phases intersection of circuit conductors between the flat cable can be easily obtained through the circuit conductor of the printed circuit board. This eliminates the need for a special design on the flat cable side, reducing the amount of flat cable itself required, and simplifying the circuit design of the flat cable, simplifying the circuit design, improving versatility, and reducing production costs. Can be achieved. Sa
In addition, insert the flat cable end into the cable fitting groove
The printed circuit board in the fitting recess.
When you type, or only write against the guide groove of the flat cable
Misalignment can be effectively prevented, and the printed circuit board
Work can be facilitated and good connection between circuit conductors can be achieved.
Connection state can be secured. In addition, flush the positioning projections.
To fit into the positioning hole of the cable
Therefore, when fitting the printed circuit board into the fitting recess,
The flat cable is dragged into the fitting recess,
Printed part of the cable cable where the circuit conductors are not exposed
While effectively preventing the situation of contact with the substrate,
When a tensile force acts on the flat cable located outside
Even if the flat cable side and the printed circuit board side
No direct tensile stress on the contact area
There is also an advantage. Furthermore, when attaching the cover body,
The printed circuit board is not
The positioning projections are fitted into the fitting holes.
Also, the engagement state between the engaging portion and the engaged portion cannot be obtained.
Therefore, it is possible to easily detect the unfit state of the printed circuit board.
There are points. What's more, there is no
However, there is also the advantage that cross wiring can be connected.
You.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a first embodiment of the present invention.

FIG. 2 is a perspective view of a printed circuit board.

FIG. 3 is a sectional view of a through-hole structure portion.

FIG. 4 is an end perspective view of a flat cable.

FIG. 5 is a perspective view in the middle of a connection step.

FIG. 6 is a cross-sectional view in the middle of a connection step.

FIG. 7 is a perspective view showing a second embodiment.

FIG. 8 is a partial plan view of a flat cable according to a third embodiment.

FIG. 9 is an explanatory diagram showing a connection example of a conventional flat cable.

FIG. 10 is an explanatory diagram showing a connection example of flat cables that cross each other.

FIG. 11 is an explanatory diagram of circuit patterns that intersect with each other.

FIG. 12 is an explanatory diagram showing an example of connection of flat cables that cross each other in the related art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flat cable 3 Circuit conductor 5 Printed circuit board 7 Circuit conductor

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-61-138479 (JP, A) JP-A-48-57184 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) H01R 23/66-23/68

Claims (2)

(57) [Claims] An end of a circuit conductor of each flat cable connected to each other is exposed, and an exposed circuit conductor of each flat cable and a circuit conductor on a printed circuit board are directly contacted with each other. flat for wiring connected to each other through the circuit conductor on the printed circuit board to circuit conductors of the respective flat cables by retaining
In the method of connecting a cable, the fitting recess into which the printed board is removably fitted is formed.
And the cover to be fitted over the fitting recess
The printed circuit board is flat on both sides of a flat board.
Circuit conductors with a corresponding spacing to each circuit conductor of the cable
The circuit pattern is formed by the
Are connected to each other by a through-hole structure.
And inserted into the side surfaces of the flat substrate, respectively.
Guide ridges are provided along the front and back surfaces of the printed circuit board in the fitting recesses.
The flat cable ends fit on both sides
The cable fitting groove to be inserted is formed and
Each guide ridge is located at a position corresponding to each guide ridge on the board.
Each of the guide grooves has a guide groove into which a flat cable is inserted.
Projections for positioning
When the cover body is provided with an engagement portion for mounting, the cover body is mounted so as to cover the fitting recess.
A fitting hole into which each of the protrusions is fitted.
And the engaged portion which is removably engaged with the engaging portion is
Is provided, and the insulating film on one side at the end is spread over a predetermined range.
At the same time as forming the positioning holes corresponding to the protrusions.
Each flat cable with the end of each circuit conductor exposed.
Exposed side of each circuit conductor faces the end of the cable
Into each cable fitting groove of the case body
At the same time, fit each projection into the positioning hole of each flat cable
After that, the printed circuit board is fitted into the fitting recess,
A method of connecting a flat cable, wherein a cover body is attached so as to cover the fitting recess . 2. The printed circuit board having cross-circuited circuit conductors, wherein the circuit conductors of each flat cable are crossed and connected by wiring.
The connection method of the flat cable described.