JPS6047706B2 - 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 divided around the circumferential surface of a rod made of an insulating rubber-like elastic material as a small press-fit type connector used, for example, to connect a liquid crystal display device and its driving printed circuit board. Structures have been developed in which the conductive comb ring is attached to the conductive comb ring or a plurality of conductive comb rings are attached to the conductive comb ring.

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, so they have the disadvantages of low productivity and high costs. The present invention takes into consideration the disadvantages and shortcomings of the above-mentioned conventional methods,
This relates to a proposed new and improved method for manufacturing a connector, in which a flexible film consisting of a striped conductive material layer is coated on the inner surface of a hollow tube. The material layer is brought into close contact with the inside to form a tubular body, and a liquid material that becomes an elastic body or a flexible body when hardened is injected and filled from the open end of the tubular body, and the liquid material is hardened to form a tubular body. It is characterized in that it is bonded and integrated with a conductive material layer, and then the cured integrated product is taken out from the hollow tube and only the film is peeled off.

To explain this, the method of the present invention basically transfers a striped layer of conductive material, which is previously formed on the surface of a flexible film, onto the surface of a core made of an elastic or flexible material. Therefore, according to the present invention, a connector having a function similar to that of a conventional product having a plurality of ring-shaped conductive material layers on the circumferential surface of a core can be manufactured by an etching process or a ring-shaped connector. Compared to conventional methods that include a mounting process, it can be obtained with much higher productivity and at a lower cost. 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 having a layer made of a conductive material formed on five surfaces thereof in the form of parallel stripes with an arbitrary pitch and an arbitrary width is used. is prepared.

The above-mentioned flexible film has a conductive material layer formed on its surface that is well adhered, and after transferring this conductive material layer to the surface of a core made of an insulating elastomer,
The film is made of a material that has good releasability from the conductive material layer, and the film includes:
For example, polypropylene, polyvinyl chloride, polyethylene, ethylcellulose, cellulose diacetate, cellulose triacetate, polyester, polyimide, polyamide, polyimideamide, etc. are used, and among these, polyester is particularly suitable.

The thickness of the above film is 5 to 200 pTn, taking into account its rigidity and flexibility, since this film will be bent with a fairly small radius of curvature in the next step. Some degree is appropriate. Further, the conductive material layer applied to the surface of the flexible film may contain particles of carbon black, carbon fiber, graphite, aluminum, nickel, tungsten carbide, copper, silver, gold, etc. as a conductivity imparting agent. It is composed of a conductive paint made by uniformly dispersing needles, needles, or a mixture thereof and other necessary additives such as antioxidants and lubricants. It is formed on the film according to various coating methods and printing methods. Since this conductive material layer is transferred and integrated onto the peripheral surface of a core made of an elastic or flexible material, which will be described later, the material of the conductive paint mentioned above should be selected in consideration of its adhesion to the core. should be decided. The thus obtained flexible film having a striped conductive material layer on its surface is preferably I
In the method of the present invention, this tape-shaped flexible film is cut into a tape shape with a constant width in a direction perpendicular to the orientation direction of the striped conductive material layer. The end of an insertion jig made of, for example, a wire rod having a diameter smaller than the inner diameter is fixed 3, and then the jig is introduced into the hollow tube by pulling the jig through the hollow tube. In this case, the width of the flexible film is preferably approximately equal to the inner peripheral length of the hollow tube, but the width of the flexible film in the present invention is not limited to 4. It may be wider or narrower than this.

If the width is larger than the circumference inside the hollow tube, the films may be overlapped, whereas if the width is smaller, the film 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. Further, the distal end portion, that is, the insertion side portion, may be expanded into a load-like structure to facilitate the insertion operation of the film, if necessary.

As mentioned above, the tape-shaped flexible film introduced into the hollow tube is tightly attached to the inside of the hollow tube with the striped pattern of the conductive material on the inside due to its rigidity, forming a circular tube shape. A liquid substance that becomes an elastic or flexible body after hardening is injected into the 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 particularly 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 downwards, or it can be heated if necessary.Furthermore, the central axis of the hollow tube can be used as the rotation axis. By rotating it, 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 process is completed as described above, the cured integrated product is then removed from the hollow tube, and if necessary, after a post-heat treatment is performed, the film is peeled off from the surface, and the outer peripheral surface of the cured product is removed. A connector can be obtained in which a plurality of conductive material layers are deposited in the form of a ring.

Examples of the present invention will be explained below.

Example 1 Width 0.75 on the surface? , a conductive paint made by blending carbon black powder with a pitch of 1.5, and a striped printed pattern, 25 μm thick, 1 width, approximately 6.3 T$t
1 length 2307n! Prepare a polyester film with a diameter of 1.0 mm and a length of 2 mm at one end of this tape-like film.
The end of a 50TWL linear insertion jig was fixed using a cyanoacrylate instant adhesive, and then the tape-like film was attached to the insertion jig with the pattern on the inside, so that the inner diameter was 27 m! The tape-shaped film was inserted into one end of a glass tube with a length of 20 mm and taken out from the other end, and the introduction of the tape-shaped film was completed with one end of the tape-shaped film left outside the 20 Tfrm glass tube.

Next, after removing the insertion jig from the tape-like film, a plug made of silicone rubber with a diameter of 2TnJn is applied to that part, and a curing agent Cat is passed through a nozzle from the open end.
Two-component silicone rubber compound KElO6L containing 10% by weight of RG [trade name of Shin-Etsu Chemical Co., Ltd.]
．． After injecting TV (trade name of the same company), the glass tube was placed in the open and left at a temperature of 150'C for 1 minute to cure the silicone rubber compound.

Next, take out the glass tube from the open and after cooling it,
When the cured integrated product was extracted from the glass tube and the tape-like film was peeled off, the width was 0.75mm. , pitch 1.57T
A rod-shaped connector having a ring-shaped conductive portion of 0 rL was obtained.

Example 2 A heating cylinder was installed at a portion 150 mm long from the tip of a glass tube with an inner diameter of 2 mm and a length of 20 mm, and this portion was kept at a temperature of 200°C, and the tape-shaped film used in Example 1 was heated. A long tape-like film having a similar striped pattern was fed at a speed of 0.1 m/min, and a silicone rubber compound similar to that used in Example 1 was injected into the cylindrical film. while passing these through a glass tube,
When the silicone rubber compound was continuously cured and the film was removed from the other end of the glass tube, the width was 0.75T0rL1 pitch 1.
A long rod-shaped connector having a ring-shaped conductive portion of 57 T$t was continuously obtained.

Claims (1)

[Claims] 1. A flexible film having a conductive material layer coated on the surface in a striped manner is closely attached to the inner surface of a hollow tube with the conductive material layer on the inside to form a tubular body. A liquid material that becomes an elastic body or a flexible body when hardened is injected and filled from the open end of the hollow tube, and the liquid material is hardened to join and integrate with the conductive material layer, and then the hardened integrated material is poured from the hollow tube. A method for manufacturing a connector, comprising taking out the film and peeling off only the film.