JPH1027637A - Fpc integral type electronic unit and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily connect a printed wiring board and a connector of separate part without increasing a number of processes. SOLUTION: In one side of a printed wiring board 10, one end of an FPC (Flexible Printed Circuit) is mounted, a conduction path 15 of the FPC and a printed circuit 14 are connected, on the other hand, a connector receiving part 18b is juxtaposed in a flat plate 18a in a connector case 18, in its reverse surface, the other end side of the FPC is arranged, and one end of a terminal 19 positioned in the inside of a connector part is connected to the conduction path of the FPC through the flat plate. The conduction path of the FPC, printed circuit and the terminal are simultaneously collectively soldered.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an FPC-integrated electronic unit and a method of manufacturing the same, and more particularly, to connecting a circuit of a printed wiring board housed in an electronic unit case to a connector for connecting an external circuit via an FPC. In the FPC-integrated electronic unit, the connection between the conductive path of the FPC, the printed circuit, and the terminal on the connector side can be easily performed.

[0002]

2. Description of the Related Art A connector is required to connect a circuit of a printed wiring board to an external circuit.
A connector 1 for a printed wiring board shown in FIG. The connector 1 has a connector housing 2 arranged side by side on a flat plate 3, a printed wiring board 4 attached to the lower surface of the flat plate 3, and a terminal 5 disposed in the connector housing 2 penetrated through the flat plate 3 to print the printed wiring board. 4 is connected to the printed circuit.

A connector 1 for a printed wiring board having the above configuration.
However, since the thermal expansion coefficient of the flat board 3 made of insulating resin and that of the printed wiring board 4 are different from each other, there has been a problem that a crack is formed in a solder connection portion between the terminal 5 and the printed circuit.

In order to solve the above problem, the applicant of the present invention disclosed in Japanese Patent Application Laid-Open No. 7-95716, a flexible printed wiring board 6 was mounted on the back of a flat plate 3 of a connector 1 as shown in FIG. It has been proposed that the terminal 5 in the portion 1 is sandwiched between insulating resin sheets of a printed wiring board 6 and soldered to a conductive foil. The use of the printed wiring board 6 made of an FPC having a conductive foil sandwiched between the insulating resin sheets has an advantage that even when thermal expansion occurs, the FPC is bent and absorbs the thermal expansion, so that stress is not concentrated on the solder connection portion. is there.

[0005]

When the printed wiring board itself is formed by FPC and the connector and the printed wiring board are integrated as described above, the above structure can be adopted. However, the above technique cannot be applied to a case where the FPC is not a FPC but a normal printed wiring board and is provided as a separate component at a position away from the connector.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and in a case where a printed wiring board and a connector are separated from each other and are made of separate components, a circuit of the printed wiring board is easily and without problems connected to the connector. The task is to be able to do so.

[0007]

In order to solve the above-mentioned problems, the present invention is directed to claim 1, wherein one side of a printed wiring board is provided.
One end of an FPC (flexible printed circuit) is attached to connect a conductive path of the FPC to a printed circuit, and the other end of the FPC is attached to the back of the flat plate of a connector case in which a connector housing is arranged on a flat plate. The FPC-integrated electronic unit is provided, wherein one end of a terminal disposed on the side of the FPC is connected to a conductive path of the FPC through the flat plate.

[0008] The conductive path of the FPC and the printed circuit and the terminal are fixed by soldering. That is, in the above-described electronic unit with integrated FPC, one end of the conductive path of the FPC (flexible printed circuit) is aligned with the printed circuit of the printed wiring board, while the FPC is aligned. The other end of the FPC is arranged on the back surface of the board of the connector case in which the connector accommodating portion is arranged on the board, and the conductive path of the FPC is aligned with the terminal located inside the connector section. The connection and fixing of the conductive path of the FPC and the printed circuit and the terminal are simultaneously and collectively performed.

More specifically, for example, a conductive foil serving as a conductive path of an FPC is exposed, and the exposed conductive foil is passed through a mounting hole formed in a printed wiring board on which electronic components are mounted, so that the printed wiring board is printed. In this state, the FPC is heat-welded to the printed wiring board, and on the connector side, the terminals arranged in each connector accommodating portion are projected through a flat plate. The protruding terminal is aligned with the FPC disposed on the back side of the flat plate, and the flat plate and the FPC are heat-welded. In this state, the circuit of the printed wiring board and the conductive foil of the FPC are connected to each other by the jet solder. The terminal and the conductive foil of the FPC are simultaneously and collectively soldered.

As described above, if the FPC and the printed wiring board and the connector case are aligned and welded in advance, the conductive foil (conductive path) of the FPC and the circuit of the printed wiring board and the terminal of the connector are simultaneously formed. Solder can be fixed and the number of processes does not increase.

The printed wiring board and the connector are FP
Since they are connected by C, they can be arranged at any positions, and the printed circuit can be easily connected to the external wiring by connecting the printed wiring board made of a separate component to the connector. The printed wiring board and the connector are not dedicated products but general-purpose products can be used, so that the cost does not increase.

An opening for mounting a connector case is provided on the surface of the electronic unit case accommodating the printed wiring board, the FPC is accommodated in the electronic unit case, and the connector case is fitted and locked in the opening. (Claim 3). F to connect printed wiring board and connector case
Since PC has flexibility, it is folded into the required form,
Alternatively, it can be accommodated inside the electronic unit case by being curved. It is preferable that a lock claw and a lock groove for locking the lock claw be provided at a position where the periphery of the opening of the electronic unit case and the periphery of the flat plate of the connector case oppose each other. With this configuration, it is possible to fix the electronic unit case to the electronic unit case with one touch simply by fitting the connector case into the opening.

[0013] The FPC and the printed wiring board are formed of an FPC.
The form in which the conductive foil is connected directly to the printed circuit by soldering is not limited, and the conductive foil may be connected via an FPC connector fixed to the printed wiring board. That is, FP
FPC via terminal housed inside C connector case
Are connected to the printed circuit. At this time, it is preferable that the FPC connector is mounted on the printed wiring board and fixed collectively by the jet solder.

Further, the FPC and the printed wiring board may be attached by caulking terminals to the respective conductive paths of the FPC in advance, and these terminals may be soldered to the printed circuit. At this time, it is preferable that the terminals and the conductive paths are also soldered at the same time by the jet solder.

Further, an F having one end connected to the connector side.
The other end of the PC may be branched into a plurality of parts and connected to a plurality of printed wiring boards. With this configuration, a large number of separate printed wiring board circuits can be connected to an external circuit via one connector.

An electronic component such as a capacitor or a coil may be mounted on a flat plate of a connector case in which the connector accommodating portions are juxtaposed, and a conductive path of an FPC on the back side of the substrate may be connected to the electronic component. 7). With this configuration, the connector case can have a joint box function.

[0017]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 to 6 show a first embodiment, and FIG.
Denotes a printed wiring board, 11 denotes an FPC, and 12 denotes a connector. The printed wiring board 10 has electronic components A, B, C... Mounted on the surface of a substrate 13 which is an electrical insulator, and a printed circuit 14 formed of copper foil is provided on the back surface of the substrate.
Each terminal 16 of the electronic components A, B, C... Is projected through a hole 13 a formed in the substrate 13 to the position of the printed circuit 14 on the back surface.

The FPC 11 is a conductive path 15 made of copper foil.
Has a structure in which both surfaces are sandwiched between resin films 17 and 17 and has flexibility. As shown in FIGS. 3A and 3B, the FPC 11 peels off the resin films 17 on both sides to expose the conductive paths 15 on the connection side of the printed wiring board.

The end of the FPC 11 is placed on one side of the upper surface of the printed wiring board 10, and the conductive paths 15 exposed from the end are connected to one side of the substrate 13 of the printed wiring board as shown in FIG. Along the holes 13b, holes are inserted at equal pitches, and project to the position of the circuit 14 on the back side. In this state, the end of the FPC 11 is attached to the printed wiring board 10 by heat welding.

The connector 12 has a resin connector case 18 in which a plurality of connector housings 18b are juxtaposed on the surface of a flat plate 18a. As shown in FIG. 6, a terminal 19 is provided in each of the connector housings 18b. The lower part of the terminal 19 is passed through the hole 18c of the flat plate 18a and protrudes to the back side.

On the back side of the flat plate 18a, the FPC
11 are arranged on the connector connection side, and
Is pierced into the conductive path 15 of the FPC 11, and the FPC 11 is attached to the connector 12 in advance.

As described above, with one end of the FPC 11 attached to the printed wiring board 10 and the other end attached to the connector 12, one end of the conductive path 15 of the FPC 11 is connected to the printed wiring board 1.
0 is aligned with the circuit 14 on the back side, and the other end is aligned with the terminal 19 of the connector 12.

In the above state, the solder 20 is sprayed on the back side of the printed wiring board 10 and the back side of the connector 12 by the jet soldering apparatus, and on the printed wiring board 10 side, the conductive path 15, the circuit 14, and the circuit 14 are connected. Terminal 16 for electronic components
However, on the connector side, the terminal 19 and the conductive path 15 are respectively
At the same time, they are soldered together.

As described above, the printed wiring board 10 and the connector 12 integrally formed via the FPC 11 are housed in the electronic unit case 21 shown in FIG. A holding portion (not shown) for the printed wiring board 10 is provided on the bottom side inside the electronic unit case 21, while an opening 21a for attaching a connector case is provided on the upper surface, and a lock groove 21b is formed on the periphery thereof. . A lock claw 18d is formed on the periphery of the connector case 18 in correspondence with the lock groove 21b.

After the printed circuit board 10 is housed in the electronic unit case 21, the FPC 11 is bent or bent into a required form and housed inside the case. Then, the connector case 18 is fitted into the opening 21, and the lock claws 18d are inserted. Is locked in the lock groove 21b and is fixed with one touch.

In the FPC-integrated electronic unit having the above configuration, the circuit 14 of the printed wiring board 10 can be connected to an external circuit via the conductive path 15 of the FPC 11 and the terminal 18 of the connector 12. Further, the conductive path 15 of the FPC 11, the printed circuit 14, and the connector side terminal 18
Can be simultaneously and collectively performed by the jet solder. Therefore, the number of steps can be reduced, the time required for assembly can be reduced, and the productivity can be increased.

FIGS. 7 and 8 show a second embodiment. The difference from the first embodiment is that the connection form between the FPC 11 and the circuit 14 of the printed wiring board 10 is changed. In the second embodiment, the connection is made using an FPC connector 25.

The FPC connector 25 has a terminal 2 which is bent inside a resin connector case 26 as shown in FIG.
7 are accommodated. Insertion port 26 of connector case 26
a, one end of the FPC 11 is inserted into the flat board 1 of the printed wiring board 10 while the conductive path 15 is brought into contact with the terminal 27 while the electrical contact portion 27 a protruding downward from the terminal 27 is
3, and protrudes to the position of the printed circuit 14 through a hole 13b formed in the same.

As in the first embodiment, the terminals 27 in the FPC connector 25 and the printed circuit 14 are collectively carried out simultaneously with the connector side by jet soldering.

FIG. 9 shows a third embodiment, in which the connection between the FPC 11 and the printed circuit 14 is made by connecting the crimp terminal 2 to the FPC 11.
8 is crimped in advance, and the electrical contact portion 28a protruding downward from the crimp terminal 28 is fixed to the flat plate 1 of the printed wiring board 10.
3, and protrudes to the position of the printed circuit 14 through a hole 13b formed in the same. The electric contact portion 28a and the printed circuit 14 are collectively formed at the same time as the connector side by the jet solder, as in the first embodiment.

FIG. 10 shows a fourth embodiment. In order to connect one connector 12 to two printed wiring boards 10A and 10B, the FPC 11 is branched into two on the printed wiring board side, and one 11-1 is printed. The wiring board 10A and the other side 11-2 are connected to the printed wiring board 10B. As described above, by branching the FPC, it is possible to connect the FPC to a plurality of printed wiring boards.
Since is flexible, the arrangement position of the printed wiring board is not restricted, and it can be connected to the FPC even if it is arranged at an appropriate position. Note that the connector connection side of the FPC can also be branched into a required number and connected to a plurality of connectors.

FIGS. 11A and 11B show a fifth embodiment, in which an electronic component 30 is mounted on the connector 12 side to have a function of a joint box. That is, the electronic component housing 18f is provided in the connector case 18, and the electronic components 30 mounted on the FPC 11, such as capacitors, coils, and diodes, are housed in the electronic component housing 18f.

FIG. 12 shows a sixth embodiment in which an opening 21a for fitting a capacitor is provided on a vertical side surface 21d of an electronic unit case 21. The connector 12 is fitted vertically into the electronic unit case 21 by fitting it into the opening 21a, and the lock claw 18d of the connector case 18 is locked and locked in the lock groove 21b on the periphery of the opening 21a.

[0035]

As is apparent from the above description, according to the present invention, since the printed wiring board and the connector are connected by the FPC, the printed wiring board of another component can be connected to the external wiring via the connector. Can be easily connected. In particular, the conductive path of the FPC can be simultaneously and electrically connected and fixed to the circuit of the printed wiring board and the terminal of the connector by soldering at the same time, so that the number of working steps is not increased, the cost is not increased, and An FPC integrated electronic unit can be provided with high productivity.

Further, the FPC can be accommodated in a case accommodating the printed wiring board by bending it, and a connector case can be fitted into an opening provided in the case and assembled with one touch. In addition, since the FPC has flexibility, the installation positions of the printed wiring board and the connector case in the case are not restricted, and the degree of design freedom is high.

Furthermore, the connection form between the circuit of the printed wiring board and the conductive path of the FPC can be directly connected, interposed with an FPC connector, or further through a crimp terminal. And at the same time as the soldering of the conductive paths.

Further, by providing a branch in the FPC, a plurality of printed wiring boards can be connected to one connector case, and can be connected to a connector housed in a required connector housing portion juxtaposed to the connector case. .

[Brief description of the drawings]

FIG. 1 is a perspective view of a first embodiment.

FIG. 2 is a perspective view showing a state in which a printed wiring board and a connector connected via an FPC of the first embodiment are attached to an electronic unit case.

FIG. 3 is an exploded perspective view showing a connection portion between the printed wiring board and the FPC according to the first embodiment.

4A is a cross-sectional view of a printed wiring board, and FIG. 4B is a cross-sectional view of an FPC.

FIG. 5 is a cross-sectional view showing a state where an FPC and an electronic component are soldered to a printed wiring board.

FIG. 6 is a cross-sectional view showing a state where an FPC is connected to a connector.

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

FIG. 8 is a sectional view of an FPC connector according to a second embodiment.

FIG. 9 is a perspective view of a third embodiment.

FIG. 10 is a perspective view of a fourth embodiment.

11A and 11B show a fifth embodiment, wherein FIG. 11A is an overall perspective view, and FIG. 11B is a sectional view of a main part.

FIG. 12 is a perspective view of a sixth embodiment.

FIG. 13 is a sectional view of a conventional example.

FIG. 14 is a sectional view of another conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Printed wiring board 11 FPC 12 connector 13 board 15 conductive path 16 terminal 18 connector case 18a flat plate 18b connector accommodating part 19 terminal 20 solder 21 electronic unit case 21a opening

Claims (8)

[Claims] 1. A connector in which one end of an FPC (flexible printed circuit) is attached to one side of a printed wiring board to connect a conductive path of the FPC to a printed circuit, and a connector accommodating portion is arranged on a flat plate. The other end of the FPC is arranged on the back surface of the flat plate of the case, and one end of a terminal located inside the connector portion is connected to a conductive path of the FPC through the flat plate.
C-integrated electronic unit. 2. The FPC-integrated electronic unit according to claim 1, wherein the conductive path of the FPC, the printed circuit and the terminal are fixed by soldering. 3. An opening for attaching a connector case is provided on a surface of an electronic unit case accommodating the printed wiring board, the FPC is accommodated in the electronic unit case, and the connector case is fitted and locked in the opening. The FPC-integrated electronic unit according to claim 1 or 2, wherein: 4. The FPC-integrated electronic unit according to claim 1, wherein the FPC and the printed circuit are connected via an FPC connector fixed to a printed wiring board. 5. The FPC-integrated electronic unit according to claim 1, wherein terminals are caulked to the conductive path of the FPC, and these terminals are soldered to a printed circuit. 6. An FPC having one end connected to a connector.
The FPC-integrated electronic unit according to any one of claims 1 to 5, wherein the other end of the FPC is branched into a plurality of parts and connected to a plurality of printed wiring boards. 7. The electronic component according to claim 1, wherein the electronic component is mounted on a flat plate of the connector case, and the electronic component is connected to a conductive path of the FPC on the back surface of the board. FPC integrated electronic unit. 8. One end of a conductive path of an FPC (flexible printed circuit) is aligned with a printed circuit of a printed wiring board, and the other end of the FPC is provided with a connector housing on a flat plate. The conductive path of the FPC is arranged on the back surface of the flat plate of the connector case and the terminal located inside the connector portion is aligned, and the connection between the conductive path of the FPC, the printed circuit and the terminal is fixed. Are performed simultaneously and collectively at the same time.