JP4600141B2 - Method for manufacturing FPC with connector - Google Patents

Description

  The present invention relates to a method for manufacturing an FPC (flexible printed circuit) including a connector.

  In general, when an electronic device inside the apparatus is electrically connected to an electronic apparatus outside the apparatus (for example, an EPU in an automobile and an electronic apparatus outside the vehicle (an electronic device provided in a part provided outside the vehicle such as a side mirror)) Are connected by a connector. Therefore, it is necessary to electrically connect the connector terminal provided on the connector and the circuit provided on the circuit board. In this case, these are electrically connected using a wire, or the connector is directly fixed to the circuit board.

  A connection configuration between a connector and a circuit board according to a conventional example will be described with reference to FIGS. 8 to 10 are side views showing a connection configuration between a connector and a circuit board according to a conventional example.

  In the conventional example shown in FIG. 8, a part of the FPC 101 on which a plurality of electronic components 201 are mounted is bent, and the connector housing 301 is directly fixed to the bent portion. In this case, the connector terminal 301 a is inserted into a hole provided in the FPC 101 and soldered on the opposite side of the connector housing 301. In the figure, X is a soldered portion.

  In the conventional example shown in FIG. 9, a hard glass epoxy substrate 400 is fixed to the FPC 102 on which a plurality of electronic components 202 are mounted. A connector housing 302 is fixed to the glass epoxy substrate 400. In this case, the connector terminal 302 a is inserted through holes provided in the FPC 101 and the glass epoxy substrate 400 and soldered on the opposite side of the connector housing 302. In the figure, X is a soldered portion.

  In the conventional example shown in FIG. 10, the connector housing 303 itself is not fixed to the FPC 103 on which a plurality of electronic components 203 are mounted, but the tip of the connector terminal 303a is fixed by welding such as ultrasonic welding. In the figure, Y is a welded portion.

  In the case of such a conventional example, the connection (fixing) work of the connector terminal with respect to the FPC and the mounting work of other electronic components are separated, and there is a problem that there are many work processes. For electronic components, if cream solder is applied by screen printing and each electronic component is placed on that part, it can be mounted together by reflow soldering, whereas in the case of connector terminals, This is because the tip portion protrudes from the FPC, which is obstructive and cream solder cannot be applied by screen printing. In the case of connector terminals, workability is also poor in that soldering must be performed manually.

  In addition, when the connector housing is large, such as when used for automobile parts, a large load is applied to the FPC when connecting the connector terminal to the FPC, which adversely affects the reliability of the connecting portion. There is a risk.

A related technique is disclosed in Patent Document 1.
JP 2002-260804 A

  An object of the present invention is to provide a method for manufacturing an FPC having a connector that improves the work efficiency while improving the quality of a manufactured product.

  The present invention employs the following means in order to solve the above problems.

The manufacturing method of FPC provided with the connector of this invention is as follows.
Using a plate-shaped jig provided with a recess for positioning and supporting the connector terminal on a part of the surface side,
Attaching the connector terminal to the recess provided in the jig so that the soldering protrusion provided in the connector terminal faces the surface side;
Disposing an FPC having a hole through which the protrusion is inserted on the surface side of the jig so as to insert the protrusion into the hole;
Applying cream solder to the soldered portion of the electronic component on the FPC by screen printing, and attaching the solder to the protrusion provided on the connector terminal;
A step of simultaneously soldering the electronic component and the connector terminal to the FPC by reflow soldering;
Removing the FPC soldered to the electronic component and the connector terminal from the jig, and attaching the connector terminal to a connector housing.

According to the present invention, since the electronic component and the connector terminal can be simultaneously soldered by reflow soldering, work efficiency is improved. Moreover, since the connector terminals can be soldered by reflow soldering, workability is good. Furthermore, since the connector terminal is attached to the connector housing after the connector terminal is fixed to the FPC, the burden on the FPC is small. Therefore, the reliability of the connection portion of the connector terminal can be maintained.

  In addition, the recess provided in the jig is configured such that the protrusion provided on the connector terminal does not protrude beyond the surface of the flat plate portion of the jig in a state where the connector terminal is positioned and supported in the recess. It is good to be.

  In this way, screen printing can be easily performed.

  As described above, according to the present invention, it is possible to improve work efficiency while improving the quality of manufactured products.

  The best mode for carrying out the present invention will be exemplarily described in detail below with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention only to those unless otherwise specified. .

  With reference to FIGS. 1-7, the manufacturing method of FPC provided with the connector based on the Example of this invention is demonstrated. The manufacturing method of the FPC provided with the connector according to the present embodiment is divided into a process of mounting electronic components and connector terminals on the FPC (pre-process) and a process of attaching the connector housing (post-process). Hereinafter, these steps will be described in order.

<Pre-process>
In particular, the pre-process will be described with reference to FIGS. FIG. 1 is a process diagram of a previous process in a manufacturing process of an FPC provided with a connector according to an embodiment of the present invention. In addition, in FIG. 1, the product in a manufacture process is shown with typical sectional drawing. FIG. 2 is an external view of the connector terminal according to the embodiment of the present invention. 2A is a plan view and FIG. 2B is a side view thereof. FIG. 3 is an external view of a product (FPC with electronic parts and connector terminals attached) manufactured from the previous process. 3A is a plan view thereof, FIG. 3B is a side view thereof, and FIG. 3C is a bottom view thereof.

  As shown in FIG. 2, the connector terminal 20 according to the present embodiment includes an insertion portion 21 that is inserted into a mating female connector terminal (not shown), and a protrusion 22 that is electrically connected to a circuit on the FPC 10. And a through-hole 23 serving as a positioning reference for positioning the connector terminal 20 with respect to the jig 50. The connector terminal 20 is formed of a thin plate member, and only the portion of the protrusion 22 is bent substantially vertically. Further, a plurality of projections 22 (four in this embodiment) are provided not only for the purpose of electrical connection but also for the role of positioning the connector terminal 20 with respect to the FPC 10. ing. Note that it is not necessary to electrically connect all of the plurality of protrusions 22 to the circuit on the FPC 10, and only some of them may be electrically connected as appropriate (that is, some of them are for positioning). May be used only).

  In addition, the jig 50 used in the previous process is composed of a flat plate-like member, and a concave portion 52 for positioning and supporting the connector terminal 20 is provided on a part of the surface side thereof. A pin 51 for positioning the connector terminal 20 is provided in the recess 52.

  First, the connector terminal 20 is disposed in the recess 52 of the jig 50. At this time, the pin 51 is inserted into the through hole 23 provided in the connector terminal 20 and the protrusion 22 provided in the connector terminal 20 faces the front side. As a result, the connector terminal 20 is positioned and supported in the recess 52. Further, in a state where the connector terminal 20 is positioned and supported in the recess 52, the protrusion 22 provided on the connector terminal 20 is configured not to protrude from the surface of the jig 50 (the surface 53a of the flat plate portion 53). (See FIG. 1A).

  Next, the FPC 10 is disposed on the surface side of the jig 50. In the FPC 10, holes 12 through which the protrusions 22 provided on the connector terminal 20 are inserted are provided at a plurality of locations corresponding to the positions of the plurality of protrusions 22. Then, the projections 22 are inserted through the holes 12. Thereby, the FPC 10 is also positioned with respect to the jig 50. In this state, the portion of the FPC 10 where the various electronic components 40 are to be mounted is disposed on the surface 53 a of the flat plate portion 53 of the jig 50. Further, the portion of the connector terminal 20 excluding the protrusion 22 is in close contact with the FPC 10, and the protrusion 22 protrudes from the hole 12 of the FPC 10. Here, since the portion of the connector terminal 20 excluding the protrusion 22 is flat, the FPC 10 is not tilted (see FIG. 1B).

Next, the cream solder 60 is applied by screen printing to the portion where the various electronic components 40 are mounted. At this time, as described above, since the protrusions 22 provided on the connector terminal 20 do not protrude from the surface of the jig 50, screen printing can be suitably performed. However, screen printing is performed only on the flat plate portion 53 of the jig 50 (see FIG. 1C). A ring solder 70 is attached to the protrusion 22 provided on the connector terminal 20. After that, various electronic components 40 are arranged at respective positions (see FIG. 1D). Then, the cream solder 60 and the ring solder 70 are soldered by reflow soldering using the heater 80 (see FIG. 1E).

  Thereafter, the FPC 10 to which the various electronic components 40 and the connector terminals 20 are attached is taken out from the jig 50. FIG. 3 shows the FPC 10 taken out.

<Post process>
In particular, the post-process will be described with reference to FIGS. FIG. 4 is a schematic configuration diagram of an FPC including a connector manufactured by the manufacturing method according to the embodiment of the present invention. In FIG. 4, the FPC is shown by a partial cross-sectional view seen from the side surface side. FIG. 5 is a plan view of the connector housing according to the embodiment of the present invention. FIG. 6 is a front view of the connector housing according to the embodiment of the present invention. 6 is a view as seen from the P direction in FIG. FIG. 7 is a schematic configuration diagram showing a modified example of the FPC provided with the connector manufactured by the manufacturing method according to the embodiment of the present invention. In FIG. 7, the FPC is shown by a partial cross-sectional view as seen from the side.

  The connector housing 31 is provided with a cracked clip 31a and an insertion hole 31b into which the connector terminal 20 is inserted. Further, the FPC 10 is provided with a through hole 11 for positioning the connector housing 31.

  With the above configuration, the connector terminal 20 attached to the FPC 10 is inserted into the insertion hole 31b of the connector housing 31, and the cracked clip 31a is fitted into the through hole 11 provided in the FPC 10. Thereby, the connector housing 31 can be attached to the FPC 10.

  The FPC 10 and the connector housing 31 may be fixed using a method other than the cracked clip 31a. For example, as shown in FIG. 7, a screw hole 32a is provided in the connector housing 32, the screw hole 32a is aligned with the through hole 11 provided in the FPC 10, and the screw 90 is screwed in, so that the FPC 10 It is also possible to fix the connector housing 32.

<Excellent points of this embodiment>
As described above, according to the manufacturing method according to the present embodiment, the various electronic components 40 and the connector terminals 20 can be simultaneously soldered by reflow soldering. Therefore, the number of manufacturing processes can be reduced. Further, since the connector terminal 20 can be soldered by reflow soldering, workability is good. From the above, work efficiency is improved. Furthermore, since the connector terminal 20 is attached to the connector housing 31 or the connector housing 32 after the connector terminal 20 is fixed to the FPC 10, the burden on the FPC 10 is small. Therefore, the reliability of the connection part of the connector terminal 20 can be maintained. Therefore, the quality of the product is also improved.

FIG. 1 is a process diagram of a previous process in a manufacturing process of an FPC provided with a connector according to an embodiment of the present invention. FIG. 2 is an external view of the connector terminal according to the embodiment of the present invention. FIG. 3 is an external view of a product manufactured from the previous process. FIG. 4 is a schematic configuration diagram of an FPC including a connector manufactured by the manufacturing method according to the embodiment of the present invention. FIG. 5 is a plan view of the connector housing according to the embodiment of the present invention. FIG. 6 is a front view of the connector housing according to the embodiment of the present invention. FIG. 7 is a schematic configuration diagram showing a modified example of the FPC provided with the connector manufactured by the manufacturing method according to the embodiment of the present invention. FIG. 8 is a side view showing a connection configuration between a connector and a circuit board according to a conventional example. FIG. 9 is a side view showing a connection configuration between a connector and a circuit board according to a conventional example. FIG. 10 is a side view showing a connection configuration between a connector and a circuit board according to a conventional example.

Explanation of symbols

10 FPC (Flexible Printed Circuit)
DESCRIPTION OF SYMBOLS 11 Through-hole 12 Hole 20 Connector terminal 21 Insertion part 22 Protrusion 23 Through-hole 31 Connector housing 31a Pre-cracking clip 31b Insertion hole 32 Connector housing 32a Screw hole 40 Electronic component 50 Jig 51 Pin 52 Recessed part 53 Flat part 53a Surface 60 Cream Solder 70 Ring solder 80 Heater

Claims (2)

Using a plate-shaped jig provided with a recess for positioning and supporting the connector terminal on a part of the surface side,
Attaching the connector terminal to the recess provided in the jig so that the soldering protrusion provided in the connector terminal faces the surface side;
Disposing an FPC having a hole through which the protrusion is inserted on the surface side of the jig so as to insert the protrusion into the hole;
Applying cream solder to the soldered portion of the electronic component on the FPC by screen printing, and attaching the solder to the protrusion provided on the connector terminal;
A step of simultaneously soldering the electronic component and the connector terminal to the FPC by reflow soldering;
Removing the FPC in which the electronic component and the connector terminal are soldered from the jig, and attaching the connector terminal to a connector housing. A method for manufacturing an FPC having a connector, comprising: The recess provided in the jig is configured so that the protrusion provided in the connector terminal does not protrude beyond the surface of the flat plate portion of the jig in a state where the connector terminal is positioned and supported in the recess. manufacturing method of the FPC provided with a connector according to claim 1, characterized in that there.

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