JP2000294329A - Connecting structure for circuit board of flexible wiring board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve reliability of a flexible printed circuit(FPC) wiring board especially used for a vehicular signal circuit wiring by maintaining a stable electric connection with an electric connector on a circuit board. SOLUTION: A slit 22 for inserting a FPC wiring board 10 is provided at a base end part 21 of a locking member 20 of a U-shaped plane locked to an end part of an electric connector 13. Inserting the FPC wiring board 10 to the slit of the locking member, its tip part 11 is inserted to a connecting slit 14 of the electric connector for achieving electrical contact. The end part of FPC wiring board is slackened more than its tip part in a mountain shape for forming a slackened part 12 to lock and fix a protrusion 22a (locking means) to a locking hole 16 (locking means) of the FPC wiring board in the slit. By the elastic reaction force of the slackened part to recover its original form, the tip part of the FPC wiring board is pressed into the electric connector for achieving a stable electric contact, and prevented from being pulled out by an external force caused by extraction or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a flexible printed circuit (FPC) and a flexible flat circuit (FF).
The present invention relates to a structure for electrically connecting a flexible wiring board formed with C) (hereinafter referred to as “flexible wiring board”) to an electrical connector on a circuit board.

[0002]

2. Description of the Related Art FIG. 5 shows a connection structure between a flexible printed wiring board and a circuit board described in Japanese Patent Application Laid-Open No. 6-132057 as a typical example of this type of connection structure. In this case, the FPC wiring board 1 is directly inserted into the connector 3 on the circuit board 2 to achieve an electrical connection between the wiring board and the circuit board.

In the case of a connector (not shown) for a flexible printed wiring board described in another example of Japanese Patent Application Laid-Open No. 4-24087, a slider is fitted as a wedge in a housing housing forming the connector. By pressing and locking the FPC wiring board against the housing with the wedges, the electrical contact with the circuit board is stabilized.

[0004]

However, in the case of the technique disclosed in the former publication shown in FIG. 5, the structure is such that electrical contact can be obtained only by inserting the end of the FPC wiring board 1 into the connector 3. If careless tensile force during work or any external force acts on the connection during use of the equipment, the FPC wiring board 1
However, there is a disadvantage that the connector 3 easily comes off the connector 3.

The technique disclosed in the latter publication is inconvenient in terms of management and cost because a single wedge (slider) must be prepared as a lock member. In addition, when used as vehicle body wiring for automobiles and the like, vibration during vehicle operation may act on the electrical contact parts, causing the wedges to loosen or slip off, and to obtain stable electrical contact with the FPC wiring board. Lacks reliability.

Therefore, an object of the present invention is to provide an FPC even when an unintended tensile force or external force acts on an electrical connection portion.
To prevent the flexible wiring board of FFC and FFC from loosening and coming off,
It is an object of the present invention to provide a circuit board connection structure of a flexible wiring board that can maintain strong, stable, and reliable electrical contact.

[0007]

According to the first aspect of the present invention, there is provided a circuit board connecting structure for a flexible wiring board, wherein a leading end of the flexible wiring board is inserted into a connection slit of an electric connector arranged on the circuit board. At the time of electrical connection, a lock member fixed to the end of the electric connector includes a base end formed in a flat U shape and locking arms on both sides, and the base end of the flexible wiring board has A slit for inserting the distal end is provided, and each distal end of the locking arm is detachably fixed to both side surfaces of the end of the electric connector, and the flexible wiring board has a distal end. In the state where the lock member is inserted into the slit of the lock member and inserted into the connection slit of the electric connector and is in electrical contact with the lock member, the rear portion of the distal end portion is formed into a mountain shape inside the flat U-shape of the lock member. To form a slack portion in Mase,
The portion of the rear part of the slack portion that is inserted into the slit is locked by locking means.

With the above arrangement, the flexible wiring board is formed with a slack portion inside the lock member, and the leading end is inserted into the electrical connector. As a result, a force for pushing the distal end portion of the flexible wiring board into the connection slit of the electric connector acts by an elastic reaction force for the loosened portion to return to the original shape, thereby maintaining stable electrical contact. Also, the elastic reaction force of the slack portion is
It also works in the direction of pulling out the rear flexible wiring board from the slit to the outside, but is prevented by the locking means provided in the slit.

According to a second aspect of the present invention, in the circuit board connection structure for a flexible wiring board, two of the lock members are fixed to one end and the other end in the connection direction of the electrical connector, respectively. Further, two opposing flexible wiring boards can be connected to one electric connector via the lock members.

That is, in this case, two lock members are attached to one end and the other end of one electrical connector so as to face each other, and two flexible wiring boards can be connected to face each other. It is much more functional than.

According to a third aspect of the present invention, in the circuit board connection structure for a flexible wiring board, the lock member includes an upper portion and a lower portion which are half-divided from a plane including the slit, and at least the half-divided portion. A protrusion is provided on one side slit as the locking means, and a locking hole is provided in the flexible wiring board at a position where the protrusion engages.

That is, in the case where a convex portion is provided as a locking means in the slit, the lock member is divided into upper and lower portions in half, and these are joined and assembled in consideration of workability when inserting the flexible wiring board. It can also be. The flexible wiring board at a position corresponding to the projection on the slit side is provided with a locking hole serving as a locking means of the other party. Therefore, for the lock member in the half-split state, if the convex portion is engaged with the locking hole at the portion in the slit and the upper and lower portions are overlapped and integrated, the form in which the flexible wiring board is inserted through the slit is obtained. Become.

Further, in the circuit board connection structure for a flexible wiring board according to claim 4, the locking means is applied to the inside of the slit to bond and lock the flexible wiring board. It is characterized in that it is a biting tooth which is engraved in a layer or inside the slit in a wave shape and bites and locks the flexible wiring board.

In this case, there is another form of the locking means. That is, an adhesive or an adhesive layer is provided inside the slit instead of the convex portion and the locking hole, and the flexible wiring board inserted therethrough is adhered and fixed. Alternatively, a corrugated biting tooth is provided inside the slit, and the inserted portion of the flexible wiring board is bitten and locked.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, as an embodiment of a circuit board connection structure of a flexible wiring board according to the present invention, a circuit board connection structure of a flexible printed circuit (FPC) wiring board will be described in detail with reference to the drawings. I do.

FIGS. 1A and 1B are a perspective view and a side sectional view showing a connection structure of an FPC wiring board 10 according to a first embodiment. An FPC wiring board 10 having a printed circuit formed on a flexible plastic sheet is formed by inserting a leading end 11 which is a connection end into a connection slit 14 of an electrical connector 13 arranged on a circuit board (not shown). Electrically connected.

A lock member 20, which is a gist of the present structure, can be easily attached to and detached from the electric connector 13.
The FPC wiring board 10 is inserted into the electrical connector 13 via the lock member 20.

The lock member 20 is, for example, a plastic molded product made of a metal mold. As shown in the drawing, the lock member 20 extends at right angles from the base end 21 on the side of the base and formed at the right and left ends of the base end 21. It consists of two vertical arms 23 on the left and right sides. The base end 21 is provided with a slit 22 through which the FPC wiring board 10 is inserted from the width direction of the distal end portion 11 in the insertion direction. The left and right locking arms 23 are shaped such that their tip portions 23a can be locked with substantially one-touch to locking recesses provided on both sides of the front portion of the electrical connector 13 and can be removed. To securely fix the locking arm 23, a lock button 15 or the like may be provided on the electric connector 13 side.

The lock member 20 has two upper portions 20A and a lower portion 20B which are halved from a plane including the slit 22.
Consists of In the case of the present example, which is the locking means of the present invention, a projection 22a is provided so as to protrude from the base end 21 on the upper side 20A side into the slit 22.

Next, an example of an assembling mode and an example of an operation of the connection structure of the FPC wiring board 10 according to the first embodiment having the above configuration will be described.

First, a lock member 20 in a half-split state comprising an upper part 20A and a lower part 20B is prepared, and the upper and lower parts 20A, 20A,
The front end 11 of the FPC wiring board 10 is provisionally positioned so as to be sandwiched between 20B.

In order to prepare for this, one locking hole 16 is provided in advance at the set position of the FPC 10 in this embodiment. Upper 2
The convex portion 22a protruding from the slit 22 on the 0A side is
After engaging with the locking hole 16 of the C wiring board 10, the lower part 20B
And integrated as a lock member 20 by overlapping and joining. As a result, the tip portion 11 of the FPC wiring board 10 is prepared so as to be inserted through the slit 22 of the lock member 20. There is no particular limitation on the method of joining and integrating the upper and lower portions 20A and 20B of the lock member 20, but joining with an adhesive or caulking with a concave and convex portion are possible.

Next, the front end 2 of the locking arm 23 on both sides of the lock member 20 with the front end 11 of the FPC wiring board 10 is attached.
3a is locked and fixed to the front side surfaces of the electrical connector 13 with almost one touch. At this time, the front end 11 of the FPC wiring board 10 is inserted into the connection slit 14 of the electric connector 13. At the time of insertion, the slack portion 12 of the FPC wiring board 10 is formed inside the flat U-shape of the lock member 20 by bending and bending the FPC wiring board 10 in the rear part from the front end 11 into a mountain shape.

By forming such a slack portion 12 on the FPC wiring board 10, an elastic reaction force acts to restore the slack portion 12 to its original shape. That is, the elastic reaction force acts in a direction in which the distal end portion 11 is further pushed into the connection slit 14 of the electrical connector 13, and the portion where the convex portion 22 a is engaged with the locking hole 16 in the slit 22 is slit. It works in the direction to pull out to the outside. However, the action of the FPC wiring board 10 trying to withdraw from the slit 22 to the outside is prevented by the locking means including the protrusion 22 a and the locking hole 16.

With the above operation, the elastic reaction force of the slack portion 12 acting on the front end portion 11 of the FPC wiring board 10 maintains stable electrical contact in the connection slit 14 of the electric connector 13.

FIGS. 2 (a) and 2 (b) show an embodiment in which the locking means comprising the locking projection 22a and the locking hole 16 in the slit 22 shown in the first embodiment is used. The main part sectional view of each of the 2nd and 3rd embodiments which adopted another locking means is shown.

In the second embodiment shown in FIG.
FP of the portion where the PC wiring board 10 is inserted through the slit 22
The C wiring board 10 is bonded with an adhesive 24. in this case,
The lock member 20 does not have to be a half-divided structure including the upper and lower portions 20A and 20B as in the first embodiment.
A slit 22 is provided in the base end 21 as an integrally molded product,
The adhesive 24 is inserted into the slit 22 when the PC wiring board 10 is inserted.
Can be applied.

In the third embodiment shown in FIG. 2B, corrugated biting teeth 25 are formed on the upper and lower surfaces of the slit 22 instead of the bonding structure using the adhesive 24 of the second embodiment. And the bite teeth 25 on the upper and lower surfaces of the slit are bitten into the inserted FPC wiring board 10 and locked.

FIG. 3 is an overall perspective view showing a circuit board connection structure of an FPC wiring board according to a fourth embodiment of the present invention.

In the first to third embodiments, the structure is such that one lock member 20 is locked and provided only on the front end face of the electrical connector 13 in the FPC insertion direction. On the other hand, in the fourth embodiment of the present example, another lock member 20 is also locked on the rear end face of the electrical connector 13, and two lock members 20 are conveniently connected to the electrical connector 12.
Are provided symmetrically on the front and rear end faces. That is, in this case, two FPCs are connected to one electrical connector 13 from the front-back direction.
This is a structure in which the wiring boards 10 are electrically connected.

Also in this embodiment, the lock members 20 are first to
Each of the structures shown in the third embodiment can be adopted, and the operation procedure and procedure for connecting the FPC wiring board 10 to the electric connector 13 and the obtained operation are the same as those in the above embodiments.

In particular, in the fourth embodiment, when used for automobile wiring, one electric connector 13 is used.
Is effective when two FPC wiring boards 10 are connected to each other from both sides thereof. Conventionally, the effect of body vibration
When the two FPC wiring boards 10 are received in the relative direction, the electric contact is particularly unstable, but this is solved by the above configuration.

In the present invention, as an application example of the first to fourth embodiments, the circuit board connection structure of the FPC wiring board according to the fifth embodiment shown in FIGS. 4A and 4B is also possible. It is.

In this case, one bar-shaped clasp 26 is provided so as to cross from one side of the locking arms 23 on the left and right sides of the lock member 20 formed in a flat U-shape to the other. By providing the clasp 26, the FPC wiring board 10 inserted from the base end 21 of the lock member 20 can be passed over the clasp 26 from above. That is, the slack portion 12 of the first embodiment shown in FIG. 1B is placed on the clasp 26.

As an application example of the fifth embodiment, although not shown, a structure in which the clasp 26 is translated in the connection direction within the length of the locking arm 23 is also possible. . By adjusting the movement of the clasp 26 in this manner, the position and size of the mountain shape of the slack portion 12 formed on the FPC wiring board 10 can be changed, and more effectively absorbed in accordance with external tensile force, external vibration force, and the like. be able to.

As described above, the connection strength of the FPC wiring board 10 to the electrical connector 13 is further increased by interlocking the front end 11 of the FPC wiring board 10 slightly before the front end portion 11 as the slack portion 12 with the clasp 26 and locking the same. In addition, stable electrical contact can be maintained.

[0037]

As described above, the circuit board connection structure for a flexible wiring board according to the present invention is particularly effective when applied to an FPC wiring board, and can be easily attached to and detached from an electrical connector on the circuit board with almost one touch. By simply attaching a lock member having an appropriate shape, the FPC wiring board can be connected to the electrical connector in a more robust state via the lock member, and there is an advantage that reliability is improved by stable electrical contact.

[Brief description of the drawings]

FIGS. 1A and 1B are an assembly perspective view and an assembly side sectional view showing an application example to an FPC wiring board as a first embodiment of a circuit board connection structure of a flexible wiring board according to the present invention. FIG.

FIGS. 2A and 2B are assembly perspective views showing second and third embodiments applied to an FPC wiring board. FIG.

FIG. 3 is an assembly perspective view showing a fourth embodiment in which two FPC wiring boards are connected to one connector so as to face each other.

FIGS. 4 (a) and 4 (b) are an assembly perspective view and an assembly side sectional view showing a fifth embodiment applied to an FPC wiring board.

FIG. 5 is a front perspective view showing a circuit board connection of a conventional FPC wiring board.

[Explanation of symbols]

10. Flexible printed circuit (FP
C) Wiring board 11 Connection end part 12 Loose part 13 Electrical connector 14 Connection slit 15 Lock button 16 Lock hole (Lock means) 20 Lock member 20A, 20B Upper and lower half halves 21 Base end 22 FPC insertion slit 22a Convex Part (locking means) 23 left and right locking arms 24 adhesive (locking means) 25 biting teeth (locking means) 26 clasp (locking means)

Claims (4)

[Claims] 1. A circuit board connection structure for inserting a distal end of a flexible wiring board into a connection slit of an electrical connector arranged on a circuit board to electrically connect the flexible wiring board, and fixed to an end of the electrical connector. The lock member consists of a base end portion formed in a flat U shape and locking arms on both sides,
A slit is provided at the base end of the flexible wiring board so that the distal end of the flexible wiring board can be inserted therethrough, and each distal end of the locking arm is detachably fixed to both sides of the end of the electrical connector. The flexible wiring board has a distal end inserted into a slit of the lock member and inserted into a connection slit of the electrical connector to be in electrical contact with the distal end inside the plane of the U-shape of the lock member. A flexible portion, wherein the rear portion of the flexible wiring board is bent into a mountain shape to form a slack portion, and a portion of the rear portion of the slack portion inserted into the slit is locked by locking means. Circuit board connection structure. 2. The electric connector according to claim 1, wherein said two locking members are fixed to one end and the other end in the connection direction of the electrical connector, respectively, and the two flexible members are connected to each other via the locking members. 2. The circuit board connection structure for a flexible wiring board according to claim 1, wherein one of the connectors is connectable to one electrical connector. 3. The locking member includes an upper portion and a lower portion that are half-divided from a plane including the slit, and a projection is provided on at least one of the slits as the locking means. The circuit board connection structure for a flexible wiring board according to claim 1 or 2, wherein a locking hole is provided in the flexible wiring board at a position where the convex portion engages. 4. The adhesive means or an adhesive layer which is applied to the inside of the slit and adheres and locks the flexible wiring board, or the locking means is engraved in a wave shape inside the slit and is flexible. The circuit board connection structure for a flexible wiring board according to claim 1, wherein the wiring board is a biting tooth that bites and locks the wiring board.