JPS6047708B2 - Connector manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is directed to a new and improved method of manufacturing a connector.

In recent years, a plurality of metal thin film rings have been separately attached to the circumferential surface of a rod made of an insulating rubber-like elastic material as a small connector used, for example, to connect a liquid crystal display device and its driving printed circuit board. Alternatively, a structure in which a plurality of conductive rubber rings are attached has been developed.

Connectors with metal thin film rings are usually manufactured by leaving multiple thin film rings on the circumferential surface of a rubber rod using an etching method, while connectors with conductive rubber rings are manufactured using multiple thin film rings that are separately manufactured in advance. It is manufactured by attaching and fixing rubber rings at a predetermined pitch. However, all of the conventionally known methods described above require complicated work and time, resulting in low productivity.
Another disadvantage and disadvantage was that the cost was high.

The present invention relates to a new and improved method for manufacturing a connector, which has been proposed in view of the disadvantages and shortcomings of the conventional methods described above. A conductive film is closely attached to the inner surface of a hollow tube so that the conductive material layer of the film is on the outside to form a tubular body, and when it hardens from the open end of the tubular body, it becomes an elastic or flexible body. After the fluid is injected and filled, the liquid is cured and integrated with the film, and then the cured and integrated product is taken out from the hollow tube.

To explain this, the method of the present invention basically involves forming a striped layer of conductive material on the surface of a flexible film in advance, and then attaching the film so that the layer of conductive material is on the outside. According to the present invention, the core material has a plurality of ring-shaped conductive material layers on the circumferential surface of the core material. Connectors with the same functionality as conventional products can be obtained with much higher productivity and at a lower cost than conventional methods that involve etching or mounting processes.

Below, the method of the present invention will be explained in detail according to its manufacturing steps.

First, in carrying out the method of the present invention, a flexible film is prepared which has a layer of conductive material deposited on its surface in the form of stripes with an arbitrary pitch and width. be done.

The above-mentioned flexible film is made of a flexible material with good adhesion of the conductive material layer formed on the surface thereof, and this film includes, for example, Suitable materials include polypropylene, polyvinyl chloride, polyethylene, ethylcellulose, cellulose diacetate, cellulose triacetate, polyester, polyimide, polyamide, and polyimideamide. Since it is bent under a fairly small radius of curvature at
Considering its rigidity and flexibility, a thickness of about 5 to 200 μm is suitable.

Since this flexible film is to be integrally bonded to the circumferential surface of a core made of an elastic or flexible material, which will be described later, the back surface of the film may be coated with adhesive or mixed with the material constituting the core. It is desirable to take measures such as sandblasting to improve bondability. In addition, the conductive material layer applied to the surface of the flexible film may include carbon black, carbon fiber, graphite, etc. as a conductivity imparting agent.
Conductive paint made by uniformly dispersing powders, needles, or mixtures of aluminum, nickel, tungsten carbide, copper, silver, gold, etc., and other necessary additives such as antioxidants and lubricants. This layer of conductive material is deposited on the film or partially embedded in the film surface using various conventionally known coating and printing methods. will be accomplished. The flexible film having the striped conductive material layer on its surface obtained as described above is preferably in the form of a tape having a constant width in the direction perpendicular to the orientation direction of the striped conductive material layer. cut into
In the method of the present invention, this tape 6-shaped flexible film is first fixed to one end of an insertion jig made of, for example, a wire rod having a diameter smaller than the inner diameter of the hollow tube.
The jig is then introduced into the hollow tube by pulling it through the tube. In this case, the width of the flexible film is preferably equal to the inner peripheral length of the hollow tube; however, the width of the flexible film in the present invention is not limited to this, and It can be wide or narrow.

If the width is larger than the circumferential length of the hollow tube, the films may be overlapped, whereas if the width is smaller than the circumferential length of the hollow tube, the films may be wound spirally and installed inside the hollow tube. When winding the film in a spiral, the conductive material layer applied to the surface of the film should have a parallel striped pattern inclined at a predetermined angle. It is necessary to make a substantially ring-shaped pattern appear in each case. The hollow tube used in the present invention is made by bending the tape-like film into a tube shape, and is made of, for example, a glass tube, a metal tube, a plastic tube, etc., and its inner peripheral surface is as smooth and uniform as possible. Furthermore, the distal end portion, that is, the insertion side portion, may be expanded into a load-like structure, if necessary, in order to facilitate the film insertion operation.

As mentioned above, the tape-like flexible film introduced into the hollow tube is tightly attached to the inside of the hollow tube with the striped pattern of conductive material on the outside due to its rigidity, and is then shaped into a circular tube. A liquid substance that becomes an elastic or flexible body after hardening is injected into the circular tube through a nozzle.

The material of the liquid used here may be any material that exhibits elasticity or flexibility after curing or solidifying at room temperature or under heating, such as natural rubber, silicone rubber, etc. Synthetic rubbers, unsaturated polyesters, hot-melt adhesive resins, cellulose resins, polypropylene, polyethylene, polyvinyl chloride, etc. can be mentioned, but silicone rubbers with low compression set are preferred.

Next, in the method of the present invention, after the liquid is injected as described above, it is hardened or solidified, but if this is done intermittently, the liquid is poured into one end of the hollow tube. After inserting the stopper to prevent leakage, it can be left standing at room temperature with it facing down, or heated if necessary, and it can also be rotated around the central axis of the hollow tube. If allowed to do so, it can be hardened or solidified into a hollow shape.

In addition, if curing or solidification is to be performed continuously, a heating cylinder for curing or solidification promotion is provided on the outside of the hollow tube, and the liquid is continuously injected and fed from the open end of the tape-shaped film. It is also possible to continuously cure or solidify. When the curing or solidification step is completed as described above, the cured integrated product is then taken out of the hollow tube to obtain a connector having a conductive material layer closely integrated with its outer circumferential surface. Examples of the present invention will be described below.

Example 1 Width 0.75Tn:Fftl pitch 1.5T0 on the surface
25 μm thick coated with a conductive paint containing rL carbon black powder, with a striped pattern printed on it.
Prepare a polyester film with a width of about 6.3wt and a length of 23cm, and attach a diameter of 1.0mm to one end of this tape-like film.
Length 250T! Fix the end of the insertion jig $L using cyanoacrylate instant adhesive, then attach the tape-like film together with the insertion jig so that the above pattern is on the outside. The tape-like film was inserted into one end of the glass tube and taken out from the other end, and the introduction of the tape-like film was completed with one end of the tape-like film remaining outside the second glass tube.

Next, after removing the insertion jig from the tape-like film, a plug made of silicone rubber with a diameter of 2Tr0rL is applied to that part, and the curing agent Ca is passed through the nozzle from the open end.
Two-component silicone rubber compound KElO6 containing 10% by weight of tRG [trade name of Shin-Etsu Chemical Co., Ltd.]
l. After injecting TV [Shin-Etsu Chemical Co., Ltd. product name],
The glass tube was placed in the open and left at a temperature of 150° C. to cure the silicone rubber compound.

Next, the glass tube was taken out from the open, and after cooling, the cured integrated product was pulled out from the glass tube, and it was found that the width was 0.
．． A rod-shaped connector having a ring-shaped conductive portion with a pitch of 75wn and 1.5wun was obtained. Example 2 Inner diameter 27
r$t1 15 from the tip of a glass tube with a length of 200TITm
A heating cylinder is installed in the length of the temperature, and this part is heated to 200℃.
A long tape-like film having a striped pattern similar to that of the tape-like film used in Example 1 was heated at a temperature of 0.1
While feeding at a speed of m/min, a silicone rubber compound similar to that used in Example 1 was injected into the cylindrical film and passed through a glass tube to form a silicone rubber compound. When the glass tube was continuously cured and taken out from the other end of the glass tube, a long rod-shaped connector having a ring-shaped conductive part with a width of 0.75Tm1n1 and a pitch of 1.5TI$L was continuously obtained. .

Claims (1)

[Claims] 1. A flexible film having a conductive material layer coated on one side in a striped manner is closely attached to the inner surface of a hollow tube with the conductive material layer of the film facing outward to form a tubular body. After injecting and filling a fluid that becomes an elastic body or a flexible body when hardened from the open end of the tubular body, the liquid substance is cured and integrated with the film, and then the cured integral body is poured from the hollow tube. A method for manufacturing a connector characterized by taking out a connector.