JP2756295B2 - Flexible wiring board assembly - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flexible wiring board, and more particularly, to a flexible wiring board assembly having a fixing portion for connection reinforcement near a connection terminal portion.

[Prior art] When connecting a flexible printed circuit board (hereinafter, referred to as FPC) and a printed wiring board (hereinafter, referred to as PCB), conventionally, as shown in FIGS. 19 and 20, each connection between PCB20 and FPC21 Terminal 2
Connection and fixation were performed by soldering 0a and 21a with solder 22. Further, when the strength of the fixing portion is required, as shown in FIGS. 21 and 22, the vicinity of the connection portion between the PCB 20 and the FPC 21 is held by sandwiching the FPC 21 with the reinforcing plate 23 via the insulating plate 24. The way was being taken.

[Problems to be Solved by the Invention] By the way, in the above-mentioned conventional FPC assembly not using a reinforcing plate, there is a drawback that a connecting portion is easily peeled off by an external force. There was a drawback that the central portion in the longitudinal direction was easily deformed. In order to increase the strength, the reinforcing plate 23 must be enlarged, which is disadvantageous in terms of space. Also,
As described above, the insulating plate 24 must be used in combination with the metal reinforcing plate 23, so that the structure is complicated and the cost is disadvantageous.

A first object of the present invention is to perform firm fixing with a simple configuration and to use the fixing portion as a check land for checking electrical characteristics, thereby improving mounting efficiency and improving the flexibility of a flexible wiring board. An object of the present invention is to provide an EPC assembly that can reduce costs.

Further, a second object of the present invention is to provide an FPC assembly that can improve mounting efficiency and reduce the cost of a flexible wiring board, and that can be firmly fixed with a simple configuration.

[Means and Actions for Solving the Problems] A flexible wiring board assembly according to the present invention has a first land portion which also serves as a check land on a wiring pattern and has a hole through which a reinforcing member can be inserted. And a printed wiring board having a second land portion having a hole capable of fixing the reinforcing member at a position corresponding to the first land portion formed on the flexible wiring board;
Forming the reinforcing member on the flexible wiring board by combining the flexible wiring board and the printed wiring board at predetermined positions such that the first land portion and the second land portion are aligned with each other. By inserting the flexible wiring board in a state sandwiched by inserting the flexible wiring board into the hole of the first land section and fixing the second land section formed on the printed wiring board to the second land section, The flexible wiring board assembly according to the present invention comprises:
A flexible wiring board having a first land portion and a second land portion on a wiring pattern; and a wiring pattern on the flexible wiring board and arranged in a longitudinal direction of the wiring pattern, and one end of the flexible wiring board is connected to the flexible wiring board. A reinforcing member formed to be insertable into the perforated first land portion and the other end to be inserted into the second land portion perforated to the flexible wiring board; and a reinforcing member formed on the flexible wiring board. A third land portion having a hole capable of fixing the reinforcing member and a printed wiring board having a fourth land portion formed at positions corresponding to the first land portion and the second land portion; The flexible wiring board and the printed wiring board are combined at predetermined positions such that the positions of the first land portion and the third land portion and the second land portion and the fourth land portion are aligned with each other. Said flexible wiring is inserted into the hole and the hole of the third land portion of the first land portion formed on the substrate, the third being formed on printed wiring board lands and fourth
By fixing the flexible wiring board to the land portion, the flexible wiring board is assembled in a state sandwiched therebetween.

Hereinafter, the present invention will be described with reference to the illustrated embodiments. 1st, 2nd
The figure shows an example of the FPC fixing portion in the FPC wiring board assembly of the present invention. The FPC 2 has a land portion 2a of a connection terminal and a circular shape for attachment and fixation having a center hole, which is disposed in the vicinity thereof and in a direction parallel to the arrangement of the terminals 2a, that is, a direction substantially perpendicular to the wiring pattern 2p. Land part 2b, 2c
In addition, semicircular lands 2d and 2e are formed on the periphery thereof and on the side edges in the width direction of the FPC. Further, these land portions 2a to 2e are all provided on the upper surface side of the FPC 2.

On the other hand, the PCB 1 has a terminal land 1a at a position corresponding to the terminal land 2a of the FPC 2, and a land
Land portions 1b, 1c, 1d, 1e are provided on the surface on the FPC2 side at positions corresponding to 2b, 2c, 2d, 2e. Note that the width of the wiring pattern 2p of the FPC2 is considerably smaller than the width of the terminal land 2a of the FPC2, and therefore, as shown in FIG.
To avoid the lands 2b and 2c,
Land area 2b for fixing without increasing the width near the terminal 2
2c, 2d, and 2e can be provided. In order to connect and fix the fixing portion of the FPC 2 configured as described above to the PCB 1, as shown in FIG. 2, the terminal land portions 1a and 2a and the fixing land portions 1b to 1e and 2b to each other. Solder 3a with 2e superimposed
Connect and fix both with 3b. With such a connection, the soldered portions of the lands 2d and 2e on the side edges in the width direction are fixed from the ends to the curl and peeling, and the lands 2b and 2c provided between the wiring patterns 2p are soldered. Parts effectively work as fixing parts for the whole holding, and even if external force such as peeling or pulling acts on FPC2, the connection terminal lands 1a, 2
No force acts on a.

Next, as a modified example of the above-described FPC fixing portion, a third portion provided in place of the land portions 2d and 2e on the side edges in the width direction of the FPC 2 is provided.
The fixing part having the soldering lands shown in FIGS. (A), (B) and (C) will be described. First, FIG. 3 (A) shows that an elongated land portion 2j is provided along a side edge of the FPC2 in the width direction, and a land is also provided on the PCB1 at a position corresponding to the land portion 2j. A portion 1j (shown by a broken line in the figure) is provided, and both are soldered to form a fixed portion. The land 2j extends to some extent in the direction along the side edge, so that even if a part of the solder is peeled off, a sufficient fixing force can be obtained in the remaining part. FIG. 3 (B) shows that a land portion 2k formed by ears protruding outward is provided on a side edge in the width direction of the FPC2, and a corresponding portion is also provided on the PCB1 side. Is provided with a land portion 1k (shown by a broken line in the figure) and soldered to form a fixed portion. This structure has a strong holding force against turning from the side. Further, the one shown in FIG. 3 (C) is provided with a tongue-shaped ear protruding laterally from the lateral edge of the FPC 2 and further extending in the direction of the connection terminal lands 1a, 2a. In addition to the land portion 21, a land portion 11l (shown by a broken line in the figure) is provided on a portion corresponding to the land portion on the PCB 1 side as a fixed portion. The one with this structure shows strong fixing force against turning from the side and the extension direction of FPC,
And it makes it difficult for the FPC itself to be cut by external force.

Further, as another modified example of the fixing portion of the FPC, FIGS. 4 (A), (B), (c) and FIGS. 4 (A), 4 (B), and (C) show a modification of the fixing land portions 2b, 2c formed between the wiring patterns of the FPC2. A fixing portion having a land portion as shown in FIG. 5 will be described.

First, the one shown in FIG. 4 (A) has an oval or rectangular hole in the center of the FPC 2 in which the longitudinal direction is the direction perpendicular to the arrangement direction of the connection terminal lands 2a or the direction of the wiring pattern. 2f and PC corresponding to it
B1 has a land portion 1f (shown by a broken line). With such a shape of the land portion, the holding force of the fixing portion can be increased.

Next, the one shown in FIG. 4 (B) is similar to that of the example of FIG. 3 (C), and the FPC2 is cut out in a U-shape at its fixing part and a tongue-shaped extending in the terminal direction. A land portion 2g is provided on the upper surface side, and a land portion 1g (shown by a broken line) of the PCB 1 corresponding thereto is provided. In this example, the FPC can be strongly fixed against turning at the center, and can be strongly fixed against cutting of the FPC itself due to external force.

Also, the one shown in FIG. 4 (C) does not avoid the wiring pattern 2p of the FPC2, but provides a land portion 2i with a hole on the pattern 2p, and similarly, the corresponding land portion 1i
(Shown by broken lines). In this structure, the land 2i can be used not only for fixing but also as a check land, and the land 1i of the PCB 1 can be formed by extending the terminal land 1h. It may be a land. Furthermore,
In the modification shown in FIG. 5, the wiring pattern portion 2p of FPC2 is used.
o is long and extends, and when the assembling work of the FPC2 is difficult to perform, it is a structure for fixing the central portion in the longitudinal direction of the FPC2, and is the same land as in FIGS. 4 (B) and (C). 2m or 2n, and the land portions 1m and 1n of the PCB 1 are provided correspondingly. The land 2m is used when it is not desired to increase the width of the FPC 2 or when the FPC 2 also serves as a check land, and the land 2n is suitable when it is difficult to turn over. The above pattern of the FPC 2 may be provided on both sides, or the FPC may be a multilayer.

Next, another example of the FPC fixing portion in the FPC wiring board assembly of the present invention will be described with reference to FIGS. Unlike the first embodiment, this fixing portion does not need to make a hole in the land portion of the FPC, and can be attached and fixed only on the lower surface side of the FPC.

That is, the part C shown in FIG. 6 is the mounting and fixing solder part. As shown in FIG. 7, the FPC 5 has, for example, an arrangement of terminals on the surface opposite to the surface having the wiring pattern. In addition to providing an elongated land portion 5a formed so as to match the direction, the PCB 4 also includes a land portion 4a arranged on the surface on the FPC 5 side in correspondence with the land portion 5a.

As a fixing method, preliminary soldering 6 is applied to the lands 4a and 5a in advance, and soldering is performed by heating both the FPC 5 and the PCB 4 in a predetermined position. With this structure, since the fixing process is performed on the surface opposite to the wiring pattern of the FPC, there is an advantage that the insulation property with respect to the wiring pattern is not impaired, and it is not necessary to change the wiring pattern for fixing.

Next, another example of the FPC fixing portion in the FPC wiring board assembly of the present invention will be described with reference to FIGS. This is
It is used when a stronger fixing force is required than that shown in Figs.
Is fixed. FIG. 9 shows a part of the cross section. The FPC 8 has a folded protrusion 9a of the wire 9 at a predetermined pitch in the vicinity of the terminal land along the arrangement direction of the terminal land. Lands 8a and 8b having holes into which the holes 9 and 9b can be inserted, and semicircular land portions 8c and 8d are also formed on both side edges in the width direction. On the other hand, the PCB 7 also has through-hole holes into which the protrusions 9a, 9b and 9c, 9d of the wire 9 can be inserted.
Land portions 7a and 7b and end land portions (not shown) are provided on the lower surface of B7. The wire 9 has protrusions 9a, 9b, 9c, 9d formed by folding at a predetermined pitch. The projections 9a and 9b are formed by bending the wire to form a projection, but the projections 9c and 9d at the ends are formed by bending into an L-shape.

The PCB 7 and the FPC 8 formed as described above are combined at a predetermined position, and the protrusions 9a, 9b, 9c, 9d of the wire 9 are inserted into the corresponding holes by the FPC.
Insert from side 8 and assemble with FPC8 sandwiched. And P
The above-mentioned protrusions and each land are soldered from the back surface of the CB 7 with solder 10.

The soldering work may be performed from the FPC8 side,
Soldering can be performed from both the upper and lower surfaces to further increase the fixing force. The wire 9 to be used preferably has a circular, square or flat cross section. The FPC 8 fixed in this manner is strongly held not only from the side edge portion in the width direction but also from external force such as tension, and the terminal land portion is more safely protected. .

Next, a modified example of the fixing portion of the FPC shown in FIGS.
This will be described with reference to FIGS. This is because there is no need to provide holes for wires in the lands 7e and 7f of the PCB 7, and lands 8e and 8f with holes are provided on the FPC 8 side, and the wires 11 have slight protrusions 11e and Only 11f is provided.
The soldering and fixing is performed by combining the PCB 7 and the FPC 8 at a predetermined position, and performing soldering in a state where the protrusions 11e and 11f of the wire 11 are in contact with the lands of the PCB 7 and the FPC 8. Note that the land portion of the FPC 8 does not necessarily need to be provided. As described above, according to this modification, the through hole of the PCB 7 becomes unnecessary, and the wire 11 as the reinforcing member is easily manufactured, which is advantageous in cost.

As shown in FIG. 12 as a similar modification of the example of FIG. 8, a land portion for fixing the projection of the wire 9 described above is provided on a land 8g electrically connected to the wiring pattern 8v of the FPC 8, It can also be used as a check land. Also,
The corresponding hole of PCB7 corresponding to it is a through-hole land. If the wire 9 is fixed on the PCB, FPC8
The land 8h is not always necessary. In this case, care must be taken so that the wire 9 is insulated from the conductive portion other than the pattern 8v.

Further, another modified example of the one shown in FIGS.
This will be described with reference to FIG. In this modification, as shown in FIG. 14, a wire 12 bent into a U-shape is used as a reinforcing member. The wires 12 are provided on the FPC 8, and the ends of the lands 8i and 8j with a pair of holes arranged in the arrangement direction of the connection terminals and the corresponding through holes (not shown) of the PCB 7 are respectively connected to the lands 8i and 8j. Inserted and soldered. With this structure, the wire can be easily attached, the workability is good, and the FPC can be partially fixed. Also, a resistance element 13 is used instead of the U-shaped wire 12.
It is also possible to solder the lands 8k and 8l on the wiring pattern of the FPC 8 while also fixing the FPC 8. Further, a U-shaped wire 12 into which an insulating tube or a protective tube 15 is inserted when the wire is a square wire is inserted as shown in FIG.
It can also be inserted into the holes 8m and 8n of the FPC 8 and the through holes of the PCB 7 and soldered and fixed at the lands 7m and 7n of the PCB 7.

In the above, the wires were arranged and fixed in the direction perpendicular to the direction of the arrangement of the connection terminals, that is, the direction of the wiring pattern of the FPC8.However, the wires should be arranged in accordance with the above wiring pattern direction. Is also possible.

The one shown in Fig. 15 inserts the wire 12 into the lands 8p and 8q that conduct with the wiring pattern of the FPC 8 or the lands 8r and 8s where the wiring pattern is avoided, and solders the through hole land (not shown) on the PCB. It is fixed. This structure is effective when the space in the width direction of the FPC 8 needs to be reduced as much as possible. Further, if the FPC 8 is long and needs to be fixed in the middle of the wiring, as shown in FIGS. 16 and 17, insert both ends of the U-shaped wire 16 into the lands 8t and 8u of the FPC 8, respectively, and PCB7 through hole land 7t, 7u
It is also possible to solder and fix above.

Further, as another modified example of the FPC fixing portion in FIGS.
A structure for securely and safely pressing the peripheral portions on both sides or one side in the width direction near the connection terminals of the FPC will be described with reference to FIG. An ear 19 is provided on a part of the side edge in the width direction near the terminal
a, 19b are protruded, and their ears 19a, 19b are folded back at the bases 19c, 19d to be in an overlapped state. And a U-shaped wire
One of the legs of 17a, 17b is connected to through holes 18a, 18b of PCB 18.
And the other is inserted into the lands 19e and 19f of the FPC 19 and the through holes (not shown) of the PCB 18. Then, the FPC 19 is fixed by soldering the wires 17a and 17b from the back side of the PCB 18 and the land side of the FPC 19. This structure reinforces the FPC 19 by folding back the ear portions 19a and 19b as described above, and can prevent the FPC 19 from being broken or torn at the pressing portions of the wires 17a and 17b. The above FPC19
Lands 19e and 19f are not always necessary. Also, ear 1
9a and 19b may be bent upward or downward. In the case of the fixing portion shown in FIGS. 8 and 9 described above, the through hole land of the PCB is used to fix each wire with solder. However, only the soldering land may be used.

[Effects of the Invention] As described above, the invention described in claim 1 provides a land portion having a hole which also serves as a check land and has a hole through which a reinforcing member can be inserted, on a wiring pattern of a flexible wiring board. A land (through-hole land) having a hole is provided on the surface of the printed wiring board facing the printed wiring board, and the flexible wiring board is fixed by a reinforcing member so as to sandwich the flexible wiring board. In addition to this, it is possible to improve the mounting efficiency and to reduce the cost per one flexible wiring board, since the space for the check land can be saved while the fixing is made possible. In addition, it is possible to measure not only the electrical characteristics of the electronic circuit provided on the flexible printed circuit board but also the electrical characteristics of the electronic circuit provided on the printed wiring board using the check land. .

In the invention described in claim 2, since the reinforcing member is provided on the wiring pattern and in the length direction of the wiring pattern, the space in the width direction of the flexible wiring board can be reduced as much as possible. As a result, it is possible to achieve a strong fixation with a simple configuration, to improve the mounting efficiency and to reduce the cost per flexible wiring board.

[Brief description of the drawings]

FIGS. 1 and 2 are a perspective view and an enlarged longitudinal sectional view showing an example of a fixing portion of an FPC in an FPC wiring board assembly according to the present invention, and FIGS. 3 (A), (B) and (C) show the above. 4 (A), 4 (B) and 4 (C) are plan views of main parts of a fixing portion around the FPC, respectively showing modified examples of the example of FIGS. FIG. 5 is a plan view of a main part of a fixing part inside an FPC wiring pattern showing a modification, and FIG. 5 is a plan view of a fixing part of an FPC intermediate part showing a modification of the example of FIGS. FIG. 7 is a perspective view showing another example of an FPC fixing part in the FPC wiring board assembly of the present invention and an enlarged vertical sectional view of a main part thereof. FIGS. 8 and 9 show the FPC wiring board assembly of the present invention. Perspective view showing another example of the fixing part of the FPC and an enlarged vertical sectional view of the main part thereof, FIGS. 10, 12, 13, and 15 show FPC fixing parts showing modifications of the example of FIGS. 11 and 14 are the FPC fixing portions of FIGS. 10 and 13 described above. 16 and 17 are FPCs showing other modified examples of the examples of FIGS. 8 and 9 above.
FIG. 18 is a plan view of a fixing portion of an intermediate portion of FIG. 18 and an enlarged longitudinal sectional view of a main part thereof. FIG. 18 is a perspective view of a fixing portion of an FPC showing another modified example of the example of FIGS. FIG. 1 is a perspective view showing a conventional FPC fixing portion, and FIGS. 20 and 22 are vertical cross-sectional views of main parts of the FPC fixing portion shown in FIGS. 2 Flexible printed circuit board (FPC) 2b, 2c Land 2d, 2e Land (for peripheral mounting)

Claims (2)

(57) [Claims] 1. A check land on a wiring pattern,
A flexible wiring board having a first land portion having a hole through which a reinforcing member can be inserted; and a hole capable of fixing the reinforcing member at a position corresponding to the first land portion formed on the flexible wiring board. A printed wiring board having a second land formed thereon, wherein the flexible wiring board and the printed wiring board are positioned at predetermined positions such that the first land and the second land are aligned with each other. In combination, the reinforcing member is inserted into a hole of the first land portion formed on the flexible wiring board, and is fixed to the second land portion formed on the printed wiring board, thereby sandwiching the flexible wiring board. A flexible wiring board assembly characterized by being assembled in a flexible state. 2. A flexible wiring board having a first land portion and a second land portion on a wiring pattern, and disposed on the wiring pattern of the flexible wiring substrate and in the length direction of the wiring pattern, and one end thereof is provided. A reinforcing member formed so as to be insertable into a hole in a first land portion drilled in the flexible wiring board and the other end to be insertable into a hole in a second land portion drilled in the flexible wiring board; A printed wiring board having third and fourth lands formed at positions corresponding to the first land and the second land formed on the substrate, the third land having a hole capable of fixing the reinforcing member; Combining the flexible wiring board and the printed wiring board at predetermined positions such that the positions of the first and third lands and the second and fourth lands are aligned with each other; Then, the reinforcing member is inserted into the holes of the first land portion and the third land portion formed on the flexible wiring board, and is inserted into the third land portion and the fourth land portion formed on the printed wiring board. A flexible wiring board assembly characterized in that the flexible wiring board is assembled by fixing the flexible wiring board.