JPH0621186Y2 - Printed circuit board connection structure - Google Patents

Description

The present invention relates to a printed wiring board connection structure, and more particularly to a printed wiring board connection structure for connecting wiring patterns of a plurality of printed wiring boards.

[Conventional technology]

Conventionally, a flexible printed wiring board in which a desired electric wiring pattern is formed by pasting a copper foil on a flexible synthetic resin sheet and removing a portion other than a necessary portion of the copper foil. (FPC) is often used, and even if there is some unevenness in the mounting location of this FPC, it can be flexibly mounted in a relatively free manner. It is particularly suitable for wiring on the back side.

Further, in recent years, along with the expansion of the application of the FPC, the wiring pattern is complicated and the number of electric circuits is increased, so that the FPC is required to be upsized.

However, the FPC used for the wiring of the combination meter of the above-mentioned automobile is extremely limited in its installation space, and therefore a large FPC cannot be used.

Therefore, conventionally, when a large FPC is required, it is equivalent to a large FPC by dividing the FPC into a plurality of parts and arranging them at predetermined positions and electrically connecting each of these FPCs to each wiring pattern. It is designed to improve space efficiency while maintaining the function of.

FIGS. 3 to 6 show a conventional FPC connection structure, in which two FPCs 2a and 2b each having a desired wiring pattern 1 printed on a surface thereof with a copper foil are provided.
A circular land 3 is formed at a predetermined position for electrically connecting a and 2b. Terminal center holes 4a and 4b are respectively formed in the center of the land 3, and the diameter A of the terminal center hole 4a of the FPC 2a arranged on the upper side is formed on the lower side of the FPC 2b. It is formed to be larger than the diameter a of 4b.

Then, the FPCs 2a and 2b are placed on the predetermined support plate 6 having the fixing screw holes 5 formed therein and the terminal central holes 4a and 4a.
The upper and lower FPCs are arranged so that the portions 4b are overlapped with each other in the fixing screw hole 5 portion of the support plate 6, respectively.
A spring washer 8 is arranged inside the terminal center hole 4a of 2a, and each FPC 2 is inserted through this spring washer 8.
a and 2b are tightened and fixed by a screw 7, whereby the lower surface of the head of the screw 7 is the land 3 of the FPC 2a on the upper side and the spring washer 8 described above.
And the spring washer 8 contacts the lower FPC2.
It comes into contact with the land 3 of b and each of the FPCs 2
The wiring patterns 1 of a and 2b can be connected via the spring washer 8.

[Problems to be solved by the device]

However, in the printed wiring board connection structure shown in FIGS. 3 to 6, the material thickness of the FPC itself is about 0.
Since it is extremely thin at 15 mm, by tightening the screw 7 on the wiring pattern 1 part of the FPC 2a, 2b, each FP
When C2a and 2b are electrically connected, stress is applied to the upper FPC 2a when the screw 7 is directly tightened, and the upper FPC 2a is damaged, or the rotational force of the screw 7 causes the upper FPC 2a to move. There is a problem that the position is displaced.

In addition, each FPC 2a, 2 via the spring washer 8
Since b is electrically connected, there is a problem in that the spring washer 8 and the screw 7 increase the number of contact points and the contact electric resistance increases.

The present invention has been made in view of the above points, and provides a connection structure for a printed wiring board, which can prevent the stress at the time of connection from being directly applied to the FPC and can reduce the contact electric resistance. The purpose is.

[Means for Solving the Problems]

In order to achieve the above object, the printed wiring board connection structure according to the present invention is provided with a plurality of FPCs having a desired wiring pattern printed on the surface of a support plate so as to be vertically overlapped with each other. By forming a terminal central hole in which the upper FPC has a larger diameter than the lower FPC in the connection portion of the wiring pattern formed in the overlapping portion of the FPC, and connecting the wiring patterns of the respective terminal central hole portions, Each FPC above
In the connection structure of the printed wiring board for electrically connecting the above, the lower FPC has a screw hole in the center and the lower surface thereof has
Has a connection protrusion that comes into contact with the wiring pattern around the terminal center hole of the above, and the upper FP is provided outside the connection protrusion.
A connection plate having a connection protrusion that comes into contact with a wiring pattern around the terminal center hole of C is provided, and a fixing screw inserted through the screw hole is screwed and fixed to the support plate to fix the connection plate, and the upper FPC is connected. And the lower FPC are electrically connected to each other.

[Action]

According to the present invention, the FPCs are arranged vertically so that the terminal central hole portions are overlapped with each other, and the FPC has a connection protrusion that comes into contact with a wiring pattern around the terminal central hole of the lower FPC. An upper FPC and a lower FPC can be electrically connected to each other by screwing and fixing a connection plate having a connection protrusion that is in contact with a wiring pattern around the terminal center hole of the upper FPC to the support plate on the outer side of the It is a thing.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

FIG. 1 shows an embodiment of a printed wiring board according to the present invention, in which two FPCs 2a and 2b having a desired wiring pattern 1 formed on a surface of a copper foil are vertically stacked. The FPCs 2a and 2b are provided with terminal center holes 4a and 4b at predetermined connection portions. The terminal center holes 4a and 4b are located on the upper side of the F
The diameter of the terminal center hole 4a of the PC 2a is arranged on the lower side F
It is formed larger than the terminal center hole 4b of the PC 2b.
Further, a metal connecting plate 9 for connecting the upper FPC 2a and the lower FPC 2b is provided in the respective terminal central holes 4a, 4b, and the central portion of the connecting plate 9 is provided in the central portion. A screw hole 10 is provided. Further, as shown in FIG. 2, upper connection protrusions 11a for contacting the wiring pattern 1 formed on the upper FPC 2a are formed at both end portions on the lower surface side of the connection plate 9. The central portion on the lower surface side of 9 contacts the wiring pattern 1 of the lower FPC 2b through the terminal central hole 4a of the upper FPC 2a, and is formed longer than the upper connection protrusion 11a by the thickness dimension of the FPC 2. The lower connection protrusion 11b is formed.

In this embodiment, the FPCs 2a and 2b are provided on the predetermined support plate 6 having the fixing screw holes 5 formed therein, and the terminal center holes 4a and 4b are provided at the fixing screw holes 5 of the supporting plate 6.
The FPCs 2a and 2b are arranged vertically so that they overlap each other, and the connection plate 9 is arranged above the terminal center holes 4a and 4b of the FPCs 2a and 2b. The FPCs 2a and 2b and the connection plate 9 are fixed on the support plate 6 by screwing a screw 7 into the fixing screw hole 5 portion. As a result, the upper connection projection 11a of the connection plate 9 comes into contact with the wiring pattern 1 of the upper FPC 2a, and the lower connection projection 11b comes into contact with the wiring pattern 1 of the lower FPC 2b. The wiring pattern 1 of 2b is connected through the connection plate 9.

Therefore, in this embodiment, the connection plate 9 is fixed to the support plate 6 with the screw 7 so that the wiring patterns 1 of the FPCs 2a and 2b are connected via the connection plate 9. In particular, the head of the fixing screw 7 does not come into direct contact with the upper FPC 2a and the tightening stress is not applied to the upper FPC.
It is possible to prevent breakage and displacement of C2a. Further, since the FPCs 2a and 2b are connected only by the connecting plate 9, the number of contact points can be reduced, the contact electric resistance can be reduced, and further, the FPC made of a material unsuitable for connection by soldering. It is suitable for connection.

In this embodiment, the lower connecting projection 11b is formed to be longer than the upper connecting projection 11a, but the connecting projections 11a and 11b are formed to have the same length and the screw 7 is formed. The connecting plate 9 may be bent by the tightening force to bring the connecting protrusions 11a and 11b into contact with the wiring pattern 1 of the FPCs 2a and 2b. Further, when the energizing current of the FPC 2 is small, the connecting plate 9 may be formed of a conductive rubber sheet.

The present invention is not limited to the above embodiment,
It can be changed variously as needed.

[Effect of device]

As described above, in the printed wiring board connection structure according to the present invention, the upper FPC and the lower side are fixed by screwing and fixing the connection plate having the connection protrusions that come into contact with the wiring patterns of the upper FPC and the lower FPC to the support plate. Since the connection with the FPC is achieved, it is possible to prevent the head of the fixing screw from directly contacting the upper FPC and applying the tightening stress to the upper FPC, and the upper FPC is damaged due to the stress. It is possible to prevent misalignment and misalignment. Further, since each FPC is connected only by the connecting plate, the number of contact points can be reduced, and the contact electric resistance can be reduced.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of a printed wiring board connection structure according to the present invention, and FIGS. 2 (a) and 2 (b) are vertical sectional views and bottom views of the connecting plate of FIG. 1, respectively. FIG. 3 is a plan view showing a connection portion of a conventional printed wiring board, FIG. 4 is an enlarged plan view of the connection portion of FIG. 3, FIG. 5 is a vertical sectional view of FIG. 4, and FIG. It is a longitudinal cross-sectional view showing a connection structure of a printed wiring board. 1 ... Wiring pattern, 2 ... FPC, 4 ... Terminal central hole, 5 ... Fixing screw hole, 6 ... Support plate, 7 ... Screw,
9 ... Connection plate, 10 ... Screw hole, 11 ... Connection protrusion.

Claims (1)

[Scope of utility model registration request] 1. A plurality of flexible printed wiring boards (hereinafter referred to as "FPCs") having a desired wiring pattern printed on a surface of a support plate are provided on a support plate so as to be vertically overlapped with each other. In the connection portion of the wiring pattern formed in the overlapping portion of the above, by forming a terminal central hole in which the upper FPC has a larger diameter than the lower FPC, and connecting the wiring patterns of the respective terminal central hole portions, In a printed wiring board connection structure for electrically connecting each FPC, a screw hole is provided in the center, and a lower surface thereof has a connection protrusion that comes into contact with a wiring pattern around a terminal center hole of the lower FPC, A connection plate having a connection protrusion that comes into contact with a wiring pattern around the terminal center hole of the upper FPC is provided outside the connection protrusion, and a fixing screw inserted through the screw hole is screwed into the support plate. A connection structure for a printed wiring board, characterized in that the upper side FPC and the lower side FPC are electrically connected to each other by fixing them together.