JPS6290884A - Connector - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates to connectors, and more particularly to new and improved flexible connectors useful for various precision electronic circuits.

(Prior art) With the miniaturization of solid-state circuits, the demand for small connectors with narrow contact terminal spacing has increased, and the demand for small connectors with narrow contact terminal spacing has also increased, and this has also increased in use in portable devices, automobile dash boards, electronic desk calculators, electronic watches, etc. that have become popular in recent years. There is an increasing demand for connectors with high resistance to shock and vibration in display circuits of various precision electronic devices. As connectors that meet these demands, connectors using conductive rubber materials have been proposed, and such conductive rubber materials are usually molded from silicone rubber mixed with carbon or metal powder to give it conductivity. ing. This connector made of conductive rubber material is sufficiently resistant to shock and vibration, and its size, shape, conductivity, and contact terminal spacing can be varied over a wide range, while being extremely reproducible. It has the advantage of

Conventionally, one form of connector using the above-mentioned conductive rubber material is a so-called zebra pattern (carbon black is used as a conductivity imparting agent), which is composed of alternating layers of conductive and non-conductive silicone rubber. A type of conductive silicone rubber that has been blackened due to filling and compounding and a non-conductive silicone rubber that is pale gray due to the silicone rubber itself is known to look like stripes on a horse. It is extremely useful as a connector for displays and printed wiring boards.

(Problem to be Solved by the Invention) However, since the surface of this zebra-patterned connector is smooth, although it has a moderate cushioning property, it is not suitable for LCD units or printed wiring. It is difficult to obtain uniform contact with the board, which sometimes causes poor contact, which impairs the conductivity of the circuit.In addition, in cases where the contact terminals are narrow, leakage often occurs in high-humidity environments, which is a serious problem. There are disadvantages, including the combination of conductive and insulating rubber,
In other words, since it is rubber-rubber, it bends easily when worn.
There are drawbacks such as the need to specially prepare a holder with a specific fitting shape, and the need to pay close attention to the pick-up during loading due to excessive bounce.

(Means for Solving the Problems) The present invention provides a connector having a new and improved structure that eliminates the drawbacks of the zebra pattern connectors described above, in which at least one side has flexibility. The conductive member and the heat-shrinkable thermoplastic insulating member are laminated and integrated alternately and in multiple layers, and the heat-shrinkable thermoplastic insulating member is heated to form a U! It is characterized in that the conductive member is contracted in a plane substantially perpendicular to the direction of force, and the protruding conductive member is used as a contact terminal.

To explain this, as mentioned above, the connector of the present invention has a zebra pattern in which conductive members and insulating members are arranged alternately. After conversion, the layer of the conductive member is simply heated to cause the conductive member to shrink in a peak-like manner. Therefore, when the connector of the present invention is actually used, only the peak-shaped conductive member comes into contact with the liquid crystal unit or printed circuit board, etc., which is a disadvantage of conventional products with smooth surfaces. The poor contact that had been occurring has been eliminated, and the characteristics have also been significantly improved.

To explain this in more detail, first, the heat-shrinkable thermoplastic insulating member of the connector of the present invention is made of a straight resin such as polyethylene, polypropylene, polyvinyl chloride, polyamide, polyacrylic, or a heat-shrinkable thermoplastic insulating material such as a block or graft copolymer. It is said to be a heat-shrinkable thermoplastic resin member made by stretching a plastic resin or a blend of these resins, but on the other hand, conductive members that become contact terminals can be made of various synthetic rubbers and plastics containing conductivity imparting agents, especially plastics. A material made of silicone rubber is suitable. This conductive silicone rubber is made by adding, for example, silicone raw rubber, a conductivity imparting agent such as powdered or fibrous carbon filler, graphite filler, or metal filler, and a vulcanizing agent such as dicumyl peroxide or di-t-butyl peroxide. , 2,5-dimethyl-2,5-di(t-butylperoxy)hexane, or benzoyl peroxide.

It is obtained by adding t-butyl perbenzoate, etc., kneading the resulting conductive silicone rubber compound, forming it into a sheet shape, and then heating and pressurizing it.

As an example of the connector of the present invention, a connector in which an insulating member made of a heat-shrinkable thermoplastic wire covering member and a conductive member made of carbon black-containing silicone rubber are arranged alternately is not suitable for mass production processing and its machine. Since it is easy to process and has good electrical properties, it has excellent advantages such as there is no risk of corroding other parts even if they come into contact with them during use.

Next, an example of the method for manufacturing the connector of the present invention will be described. First, in the first step, a large number of heat-shrinkable thermoplastic insulating members and conductive members, each of which has been formed into a sheet shape, are alternately laminated. Integrate to obtain a block-like body.

The sheet-shaped heat-shrinkable thermoplastic insulating member used here may be uniaxially stretched or biaxially stretched, and this can be selected depending on the use of the connector. However, during lamination, the stretching direction of the sheet must be aligned in a certain direction within a plane perpendicular to the lamination direction. In addition, the thickness of the sheet-shaped bodies used here determines the contact terminals and the contact terminal spacing of the connector, so when preparing these sheet-shaped bodies, it is necessary to pay careful attention to the thickness. be. Furthermore, in laminating and integrating, the sheet-like bodies may be laminated and integrated using a suitable adhesive depending on the type of their constituent materials.

The block-like body obtained as described above is then
In the process, the sheets are cut in the stacking direction to obtain a connector prototype of the desired shape. That is, for example, if the block-like body is cut along a plane in the stacking direction, a sheet-like body or a plate-like body in which conductive members and heat-shrinkable insulating members are arranged in a striped manner can be obtained. By cutting the shaped body into prismatic or cylindrical shapes in the stacking direction, a rod-shaped body in which conductive members and heat-shrinkable members are alternately arranged in the length direction can be obtained. Incidentally, since the material cut out in this step becomes the prototype of the connector, the dimensions of the cut may be determined depending on the manner in which the connector is used.

In the third step, the connector prototype obtained in the second step is heat-treated to shrink the heat-shrinkable thermoplastic insulating member, and this heat shrinkage causes the layer of the insulating member to dent.
A connector according to the present invention is obtained in which the calendar of the conductive member projects in a peak shape.

In addition to the manufacturing method described above, the connector according to the present invention can be manufactured by
For example, a heat-shrinkable thermoplastic insulating member and a conductive member are each formed in advance into a shape corresponding to the prototype of the connector described above, and then laminated and integrated.

It can also be produced simply by heat treatment.

(Effects of the Invention) As explained above, in the connector according to the present invention, the calendar of the conductive member serving as the contact terminal is in a state in which it projects in a peak shape from the layer of the insulating member. Compared to conventional products of this kind in which the non-conductive members are arranged on the same smooth surface, the contact properties are much better, and at the same time the creepage between the contact terminals of the connector according to the present invention is improved. Since the distance is much greater than that of conventional products with the same contact terminal spacing, its leakage characteristics are significantly improved and its practical value is therefore great.

Example 1 Commercially available heat-shrinkable Toughprene tube (Asahi Kasei Kogyo Co., Ltd. styrenic resin Toughprene A extruded into a tube shape, circumferentially-axially stretched, stretch ratio 2.0, wall thickness 1.0 mm)
After cutting it open in the axial direction, it was cut into squares of 100 square meters to prepare a heat-shrinkable thermoplastic insulation sheet. In addition, 100 parts of a conductive silicone rubber compound (KE3701U, manufactured by Shin-Etsu Chemical Co., Ltd.) and 3 parts of a vulcanizing agent (C-3, manufactured by Shin-Etsu Chemical Co., Ltd.) were mixed and kneaded, and the mixture was molded into a sheet with a thickness of 1.041 cm. , an unvulcanized conductive sheet was prepared by cutting it into a square of 100 layers x 100 layers, and the 11 heat-shrinkable insulating sheets and 12 conductive sheets were stretched into a heat-shrinkable thermoplastic insulating sheet. Laminate them alternately in the same direction, and then heat the laminate in a mold at 160°C, 1.2kg/
After heat treatment for 1 hour under crn' conditions, it was left to cool to room temperature and a block-shaped body (96 ml x 96 x 23 x
m) was obtained. Next, the block-like body is cut one after another in the stacking direction to obtain a striped sheet-like body (96 layers×
This striped pattern sheet was further cut to obtain a connector prototype (23 layers x 5 layers x 2 layers).

Finally, when the prototype of the connector was heat-treated at 200°C for 5 minutes, the insulating part was heat-shrinked and recessed in a plane perpendicular to the stacking direction, and the conductive part was exposed in peaks. A square bar-shaped connector according to the present invention is obtained.

Example 2 3 parts of Ca-Zn stabilizer -CZ-10 (trade name, manufactured by Sakai Chemical Co., Ltd.) was blended with 100 parts of chlorinated polyethylene Zandynelac (trade name, manufactured by Osaka Soda Co., Ltd.), and the mixture was calendered to a thickness of 2. After forming the shoe into a sheet, it was subjected to two-wheel stretching at a stretching ratio of 2.0) and then 100 m x 100
A heat-shrinkable thermoplastic insulation sheet with a thickness of 1 inch was prepared by cutting it into dragon squares, and then 11 of the above heat-shrinkable thermoplastic insulation sheets and an unvulcanized conductive sheet similar to Example 1 were prepared. 12 sheets were stacked alternately in the stretching direction of the heat-shrinkable thermoplastic insulating sheet, and then this laminate was heated at 160°C for 1
．． After heat and pressure treatment for 1 hour under the condition of 5 Kg/c rrl', the mixture was cooled to room temperature to obtain a block-like body. Next, the block-shaped body is cut one after another along the plane in the stacking direction.
Furthermore, it was cut again in the direction perpendicular to the stacking direction to obtain a connector prototype (23 m x 5 tungsten layers x 2 volumes).Finally, when this connector prototype was heat-treated at 200°C for 5 minutes, the insulating parts A rod-shaped connector of the present invention was obtained in which the entire circumferential surface of the connector was heat-shrinked and recessed, and the conductive portion was raised in a ring shape.

Claims (1)

[Claims] A conductive member and a heat-shrinkable thermoplastic insulating member, at least one of which is flexible, are laminated and integrated in multiple layers alternately, and the heat-shrinkable thermoplastic insulating member is heated to approximately A connector characterized in that the conductive member contracted in a perpendicular plane and protruded serves as a contact terminal.