JPS6047707B2 - 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, as a small connector used for connecting a liquid crystal display device and its driving printed circuit board, for example, a plurality of metal thin film rings are separately attached to the circumferential surface of a rod made of an insulating rubber-like elastic material. 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 and high costs.

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. After temporarily attaching the conductive film to a core made of a flexible elastic material with the conductive material layer on the outside, the film and the core are joined while being inserted and passed through a hollow tube. The method is characterized in that it is integrated and then the joined 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 conductive material layer is on the outside. Therefore, according to the present invention, a plurality of ring-shaped conductive rings are formed on the circumferential surface of the core made of a flexible elastic material. A connector having the same function as a conventional product having a layer of a flexible material can be obtained with much higher productivity and at a lower cost than a conventional method including an etching process or a rubber ring attachment process.

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 in stripes with an arbitrary pitch and an arbitrary width on its five surfaces is used. is prepared.

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, ethyl cellulose, cellulose diacetate, cellulose triacetate, polyester, polyimide, polyamide, polyimide amide, and the like.

In addition, the thickness of the above film is 5 to 200 prr, taking into consideration its rigidity and flexibility, since this film will be bent with a fairly small radius of curvature in the next process.
L. A moderate amount 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 or partially embedded in the film surface by various painting methods, printing methods, etc. On the other hand, the insulating core used in the present invention is tube-shaped or rod-shaped, and includes, for example, soft vinyl chloride resin, soft olefin resin, ethylene-vinyl acetate copolymer resin, silicone rubber, Any other flexible and elastic materials such as synthetic rubber can be used, but rubber elastic bodies with low compression set such as silicone rubber are particularly preferred.

In the first step of the present invention, the flexible film formed by coating the surface of the flexible film with a conductive material layer in a striped manner and the rod-shaped or tube-shaped core body 3 made of an insulating elastomer are hollowed out in the first step of the present invention. By fitting and passing through the tube, the film is wound and integrated around the circumferential surface of the core with the conductive material layer facing outward.

The hollow tube used in the present invention is a hollow tube for tightly wrapping the film around the core, and is made of, for example, a glass tube, a metal tube, a plastic tube, etc. The inner diameter is approximately equal to or slightly smaller than the outer diameter of the flexible film wrapped around the core, and the inner peripheral surface is made as smooth and uniform as possible, and The end thereof, that is, the part on the side where the core is inserted, is optionally expanded into a rod-like structure in order to facilitate the insertion of the core and the film.The first step of the method of the present invention described above The flexible film can be wrapped around the core in various ways, but the most typical method is to use a conductive material whose width is equal to the perimeter of the core. A flexible film of a fixed length and a fixed width with a striped pattern extending in the width direction is wrapped vertically around the core. This creates a ring-shaped striped pattern on the surface.

In this case, the ring-shaped pattern 7 may be C-shaped with a portion slightly missing, but it is of course better to form a closed ring-shaped pattern. The shape of the flexible film in the present invention is not limited to one in which the width is equal to the circumference of the core as described above; If it is small, or even wound into a roll, the conductive material layer applied to the surface is formed into a pattern of parallel stripes inclined at a predetermined angle. It is necessary to wind the film helically around the core so that independent, substantially ring-shaped patterns appear on the surface of the core.

When winding a flexible film around a core, either vertically or spirally, the tip of the film is temporarily attached to the tip of the core, and then the flexible film is wrapped around the core in order. In addition, when winding in a spiral, winding can be easily done by rotating the core and film relative to each other while inserting the core and film into the hollow tube. Further, this winding may be performed when the core body and film are inserted into the hollow tube, or may be performed in advance at a stage before that.

When wrapping the flexible film around the core, if the film and/or the core are made of uncured or semi-cured comb material and have an adhesive surface, it is possible to simply wrap the flexible film and integrate it. Although it is possible, if there is not enough adhesive between the two, it is necessary to integrate them via a suitable adhesive layer. The adhesive used here may be any type of adhesive that cures or hardens at room temperature or under heat, such as urethane, epoxy, unsaturated polyester, vinyl chloride-vinyl acetate copolymer, silicone, etc. It is possible to use any synthetic rubber-based material that exhibits flexibility after curing or solidification. In addition, in order to apply the above adhesive, for example, when inserting the core and film into the hollow tube and wrapping it, the adhesive may be supplied to the surface of the core through a nozzle, or the film may be wound around the core. This is done by introducing the core into a tank filled with adhesive and adhering the adhesive to the surface of the core before attaching the core. Further, when the film is inserted into the hollow tube, it is necessary to pay sufficient attention to the amount of adhesive applied so that excess adhesive does not protrude from the seam of the film and stain the inner peripheral surface of the hollow tube. Next, in the method of the present invention, as described above, adhesive is applied on the core body as necessary and a flexible film is wound around the core body, and these are inserted into the hollow tube, and the above-mentioned conductive material layer is The film, core, or adhesive is cured or solidified to integrate the film with the core, but this can be done by leaving the core etc. inside the hollow tube at room temperature, or if necessary. Furthermore, when a heating cylinder is provided around the outer periphery of the hollow tube, the curing or solidification of the adhesive is promoted and continuous bonding and integration can be achieved.

When the adhesion and integration step is completed in this way, the core body is then removed from the hollow tube to obtain a connector in which the conductive material layer is closely and integrally formed on the outer peripheral surface of the core body.

Examples of the present invention will be described below.

Example 1 (1) Width 0.75TfUn1 pitch 1.5rf0 on the surface
A polyester film with a thickness of 25 μm and a width of about 6.3 Tf7L, on which a striped pattern is printed using a conductive paint containing carbon black powder of n, (2) an outer diameter of 1
．． 5th order, inner diameter 0.8T7L1 length 230Tr0! L silicone rubber tube, (3) an adhesive consisting of a two-component silicone rubber compound KE97RTV (trade name of Shin-Etsu Chemical Co., Ltd.) to which 2% by weight of a curing agent CatRG [trade name of Shin-Etsu Chemical Co., Ltd.] was added, and (4) Inner diameter 27707! A glass hollow tube having a length of 200 rf0n was prepared in advance.

Next, apply adhesive around the silicone tube, apply the polyester film vertically to it with the striped pattern on the outside, and insert it into the glass tube. the end of 20r1rm
I left it behind and finished wrapping it.

Next, put the glass tube with the tube and film inserted into the open hole, heat it at 150℃ for 10 minutes to harden the adhesive, take it out of the open hole, and then remove the silicone tube from the glass tube. When pulled out, a connector having a ring-shaped striped pattern on its circumferential surface was obtained. Example 2 Inner diameter 2Wr! n1 length 20 15 from the tip of the dead glass tube
Attach a heating cylinder to the length of 0.
℃ and 0.17T1 from one end of the glass tube.
．． A long tape-like polyester film having the same pattern as the tape-like film used in Example 1 and a long silicone rubber tube were inserted at a speed of 1/min while injecting adhesive, and this adhesive was continuously applied. After allowing it to harden or solidify, it was taken out from the other end of the glass tube.
Long connectors having a printed pattern made of conductive paint with a width of 0.75 mm and a pitch of 1.5 TfUn were continuously obtained.

Example 3 The width on the surface is 0.377!77! , pitch 0.6TWL
A polypropylene film with a thickness of 20 μm and a width of 9.4 TIUn, which has been printed with a striped pattern using conductive/electrical paint containing silver powder, was coated with a curing agent Desmodyur L5 (trade name manufactured by Cemedine Co., Ltd.) with the pattern on the outside. ) 5% by weight of urethane adhesive #700 (product name manufactured by Cemedine) was applied continuously from one end of a stainless steel tube with an inner diameter of 3 Wft and a length of 2007 wt, together with a 2.5 wL diameter isoprene rubber round rod. I inserted it and wrapped it around it.

Claims (1)

[Claims] 1. After temporarily attaching a flexible film having a conductive material layer on one side in a striped manner to a core made of a flexible elastic material with the conductive material layer facing outward, A method for manufacturing a connector, characterized in that the film and the core are bonded and integrated while being inserted into and passed through a hollow tube, and then the bonded and integrated product is taken out from the hollow tube.