JPS5910700Y2 - Conductor connection part of flexible printed body - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a conductor connection portion of a printed body, and is useful for connection between a flexible flat cable and a flexible printed wiring board.

When connecting a flexible printed wiring board to the conductor surface of the other side, a convex object is provided on the member that holds the connection part, and this convex object is pressed against the flexible printed wiring board through a rubber sheet to make conductor contact. It is known to compress surfaces.

According to such a conductor connection part, the contact pressure on the conductor contact surface can be increased and the contact resistance can be lowered, but the protrusions are hard and bite into the rubber sheet, easily damaging the rubber sheet. If it is damaged, the hard convex object will bite into the flexible printed wiring board, and the wiring board will inevitably be damaged.

In addition, the holding member is hard and the shape of the convex object is problematic.

The conductor connection part of the printed body according to the present invention has a structure that can eliminate the above-mentioned disadvantages, and has a protrusion that bulges from the insulating film on the back side of the conductor end to the surface of the conductor at the conductor end of the printed body,
The printed conductor end is brought into contact with the conductor of the mating printed body, and both printed bodies at this contact point are held between a presser fitting with a flat presser surface via a rubber pad.

The present invention will be explained below with reference to an embodiment shown in the drawings.

In Fig. 1, reference numeral 1 denotes a flexible printed wiring board, the insulating film 11 is a plastic film with a thickness of 25 to 250μ, and the printed conductor 12 is a copper foil with a thickness of 8 to 140μ in a predetermined pattern.゛Etched material is used.

Reference numerals 121 and 121 are printed conductor ends, 2 is a hole provided in the flexible printed body 1, and 122 and 122 are protrusions formed on the printed conductor ends 121 and 121, and this protrusion 122 is shown in FIG. As also shown, the shape is formed by a bulge from the insulating film surface 110 on the back surface of the conductor end.

The height of this protrusion 122 is usually 0.02 to 10 mm,
The diameter is usually 0.1 to 3 mmφ, and the shape of the protrusion 122 is such that a flexible printed wiring board is placed on the mold having the protrusion, with its insulating film surface facing the mold surface. A method such as applying pressure to the upper surface of the flexible printed wiring board with a rubber body is used.

The shape of the protrusion 122 can be formed after printing the conductor or at the same time as punching the printed board into a predetermined shape.

In FIG. 1, 3 and 3 are flexible flat cables, and the conductor ends 31 and 31 of each cable 3 and 3 are connected to each conductor end 121 and 12 of the flexible printed wiring board 1, respectively.
1 has been interviewed.

4, 4 is a rubber pad, 5, 5 is a presser metal fitting, and the presser surface is flat.

These presser fittings 5, 5 are tightened by screws 6 that pass through the central hole 2 of the flexible print 1 and the wiring board 1.

In the above, the conductor end protrusions 122, 122 of the wiring board are coated with metal such as gold, rhodium, nickel, tin, etc. to a thickness of 0.5 to 0.5 mm.
It can be used with an extremely thin thickness of 3mm.

Further, the number of protrusions at the end of the conductor may be two or three.

In the above embodiment, the protrusion is formed at the conductor end of the flexible printed wiring board, but this protrusion may also be formed at the conductor end side of the flexible flat cable.

The conductor connection part of the printed body according to the present invention is constructed as described above, and a rubber pad is applied to the back of the printed body with a protrusion on the conductor, and the air in the recess on the back of the protrusion is Since the recess is sealed with a rubber pad, it will not leak even when pressurized, and therefore, the protrusion at the end of the conductor will not leak due to the air inside the recess despite being tightened by the presser metal fitting. This protrusion can maintain a protruding shape, and this protrusion can apply sufficient contact surface pressure to the conductor contact surface, reducing contact resistance, and this effect is the same as in the conventional example described above. However, the protrusion is held by the air pressure in the recess, and has the effect of uniformly distributing the contact surface pressure,
And since it is not as hard as the convex object in the conventional example mentioned above,
The disadvantages of the conventional example (damage to the rubber sheet and flexible printed wiring board due to the convex object biting in) can be avoided.

Furthermore, the protrusions are provided on a printed body using an insulating film as a substrate, and since the printed body is thin and soft, the shape of the protrusions can be easily shaped.

[Brief explanation of drawings]

FIG. 1 is an explanatory view showing one embodiment of a conductor connection portion of a flexible printed body according to the present invention, and FIG. 2 is an explanatory view showing a conductor end protrusion of the flexible printed wiring board in FIG. 1. In the figure, 1 is a flexible printed wiring board, 12.
12 is a printed conductor of the wiring board 1, 121, 121 is a conductor end, 122, 122 is a conductor end protrusion, 3, 3 is a flexible printed cable, 31.31 is a conductor end of the flexible printed cable 3, 3, 4, 4 is pad, 5,5
is a presser plate, and 6 is a screw.

Claims (1)

[Scope of utility model registration request] A protrusion that bulges out from the insulating film on the back side of the conductor end to the conductor surface is provided at the conductor end of the printed body, and the printed conductor end is brought into contact with the conductor of the mating printed body, and both printed bodies at this contact point are covered with rubber pads. A conductor connection portion of a printed body, characterized in that the conductor connection portion of a printed body is held by a presser metal fitting having a flat presser surface.