JPH0117100Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a pressure-contact clamping type interconnector, and in particular to a pressure-contact clamping type interconnector that maintains linearity during mounting, is easy to set up, and prevents short-circuiting between adjacent electrodes. It is something.

A known interconnector is a rod-shaped body with a rectangular cross section that is made by laminating conductive rubber-like elastic bodies and insulating rubber-like elastic bodies alternately and in multiple layers. This connector is commonly used for electrical connections between a circuit board and an opposing circuit board, but in order to obtain a good electrical connection using this connector, a considerable amount of external pressure must be applied between the electronic circuits and the connector must be Since it is required to be in a compressed state, this is called a pressure clamp type interconnector.

In order to stabilize the connector arrangement during mounting, this press-fit clamping type interconnector is coated with insulating rubber that has a lower hardness than the rubber-like elastic body that makes up the connector. Connectors (see Japanese Patent Application Laid-Open No. 156680/1983) which are formed by integrally bonding a shaped elastic body as a support member are often used. However, due to the problem of space within the device due to the diversification and high density of liquid crystal display elements in recent years, this connector has also been developed with a smaller electrode terminal pitch, and with a thinner support layer. Alternatively, connectors that do not have this bonded are now being used, but although the pressure contact load during mounting is reduced by thinning the supporting member layer, this type of connector is becoming longer and longer. The linearity of the connector itself is impaired, and the connector easily meanders, making it difficult to accurately position it perpendicular to the electrode area of the liquid crystal display device during mounting, and it takes a lot of effort to set it up. This has the disadvantage that adjacent electrode terminals may be short-circuited.

The present invention relates to a press-fit clamping type interconnector that solves these disadvantages, and consists of conductive rubber-like elastic material layers and insulating rubber-like elastic material layers alternately so that their bonding surfaces are parallel to each other. An insulating rubber-like elastic body having a rubber hardness smaller than that of the rubber-like elastic body is provided as a support layer on the side circumference of a rod-like body having a rectangular cross section formed by integrating multiple layers, and the side circumference of this support layer is It is characterized in that a second support layer made of an insulating rubber-like elastic material having a higher rubber hardness than the rubber-like elastic material forming this support layer is provided on the surface.

To explain this, the present inventors proposed a conventional method in which an insulating rubber-like elastic material with low rubber hardness was provided as a support layer on a rod-shaped body made by laminating and integrating a conductive rubber-like elastic material and an insulating rubber-like elastic material. As a result of various studies on improving the known pressure-contact clamp type connector, it was found that an insulating rubber-like elastic layer having a rubber hardness greater than that of the support layer was provided on the side periphery of the support layer in this known pressure-contact clamp type connector. For example, since the linearity of this connector is maintained even if this support layer is made thin, it is easy to place this connector perpendicularly to the electrode part of a liquid crystal display device or a circuit board, and there is no holder or the like to accept this connector. We have found that this method has the advantage that it can be set accurately even when the The present invention was completed by conducting research on minimizing the electrode spacing in the connector, the thickness of the support layer and the hard insulating rubber-like elastic layer provided on the side periphery thereof, the rubber hardness, etc.

The conductive rubber-like elastic body constituting the pressure-contact clamp type interconnector of the present invention is made of rubber-like elastic bodies such as various thermoplastic resins, natural rubber, and various synthetic rubbers that exhibit rubber-elastic behavior, carbon black, metal powder, or graphite. The insulating rubber-like elastic body may be made of an insulating rubber member containing a conductivity-imparting agent such as However, it is generally preferable to use silicone rubber as this rubber member due to its physical and electrical properties. This connector is made by, for example, molding the conductive rubber member and the insulating rubber member into sheet-like materials of desired thickness, and then stacking the required number of sheets alternately, applying pressure, and heating as necessary to form a block. The rubber hardness of this product is JIS hardness of 40 to 90 for the conductive rubber-like elastic body part and 70 for the insulating rubber-like elastic body part. The following may be used.

The support layer made of an insulating rubber-like elastic material provided on the side circumference of the connector part described above may be made of the same rubber material that makes up the connector part, but the hardness of this rubber is different from that of the rubber material that makes up the connector part. If it is larger than the rubber-like elastic body, the insulating body will protrude beyond the connector part when it is pressed into contact with the insulating body, so it needs to be made of a material with relatively low rubber hardness, preferably 50 or less in JIS hardness. teeth
It is preferably 40 or less, and moreover 10 or more lower than that of the insulating rubber-like elastic body constituting the connector portion. In addition, the insulating rubber-like elastic material constituting this support layer may cause the liquid display element and the circuit board to shift due to impact such as when the liquid crystal display device is dropped, and the opposing electrodes may not be properly connected to each other. In particular, it is desirable to have adhesiveness to the glass of the liquid crystal display element, so this is a compound containing a large amount of fumed silica with a specific surface area of 150 to 400 m ² /g to silicone raw rubber, or a room-temperature curing silicone. Rubber is often used, such as silicone rubber KE-151U [trade name of Shin-Etsu Chemical Co., Ltd.], SE-1120U [trade name of Toray Silicone Co., Ltd.],
Examples include TSE-260-3μ (trade name manufactured by Toshiba Silicone Co., Ltd.). In addition, the thickness of this support layer should be 30 to 30 mm relative to the thickness of the connector because if it is too thick, the force when pressing the connector will be too large.
50%, but since the straightness of the connector of the present invention is mainly provided by a second support layer having a harder hardness provided on this side periphery, which will be described later, this is a range of 50%. It is preferable to set it as the range of 25-45% with respect to parts.

Next, the second support layer made of an insulating rubber-like elastic body provided on the side periphery of this support layer may be made of the same rubber material as the connector member or the above-mentioned support layer. , this is synthetic paper,
It may be reinforced with synthetic fibers, inorganic fibers, etc., but since this is what maintains the linearity of the connector, it is necessary to use a rubber hardness greater than that of the support member described above. Yes, specifically JIS hardness 50
It is preferable to set it as the range of -70. Although the thickness of this second support layer cannot be specified because the degree of bending (non-linearity) of the connector part varies depending on its length, height, and width, if it is too thick, it will cause problems in connector mounting. It is best to make it as thin as possible because the compressive load increases when
For example, the connector part has a length of 200 to 300 mm and a height of 2 to 300 mm.
When it is something like 7mm, width 26-40mm
It may be about 0.05 to 0.2 mm. Therefore, the second support layer is installed by applying a liquid rubber composition to the support layer provided on the connector section, and
This can be cured by heating or other means to coat the surface of the support layer with a rubber layer, but it is also possible to co-vulcanize or glue an insulating rubber-like elastic sheet to a predetermined thickness. You may also match them.

Next, the press-fit clamp type interconnector of the present invention will be explained based on the attached drawings. FIG. 1 shows a perspective view of the interconnector of the present invention, in which a conductive part 1 made of a conductive rubber-like elastic material and an insulating part 2 made of an insulating rubber-like elastic material are shown. A support layer 4 formed from an insulating rubber-like elastic material having a rubber hardness smaller than that of the rubber-like elastic material constituting the insulating portion 2 is provided on the side circumference of the connector portion 3 which is alternately laminated in parallel in multiple layers. joined,
A second support layer 5 made of an insulating rubber-like elastic material having a higher rubber hardness than the rubber-like elastic material constituting this support layer is provided on the side circumference of the support layer 4. This support layer 4 and the second support layer 5
If it is too thick, the required pressure contact load of this connector will increase, so the thickness of the support layer 4 is 10 to 25% of the connector part, and the thickness of the second support layer is 0.05 to 0.2 mm.
It may be within the range of .

Since the connector of the present invention is configured as described above, its linearity is reliably maintained by the support layer 4 and the second support layer 5, and the arrangement during mounting is more stable than that of conventional products. In addition, the second support layer, which has a relatively high rubber hardness, completely prevents the expansion of the connector due to the bulge in the length direction of the connector part caused by the pressure contact load during mounting. given the advantage of being
Furthermore, since the connector is designed to have high linearity, the electrode spacing between the conductive part and the insulating part of the connector part can be made as low as 0.05 to 0.01 mm, which makes it possible to reduce the pitch of the liquid crystal display element. Even if the electrode pitch between the circuit board and the circuit board becomes smaller, connection thereto becomes possible, giving the advantage that the range of application thereof is expanded.

Note that FIG. 2 is a cross-sectional view showing the state when a pressure contact load is applied to this interconnector, and in this case, the support layer 4 and the second support layer 5 provided on the side circumference thereof are Since bending deformation occurs, an increase in the pressure welding load is prevented, and even in this case, the connector part does not deform at all, so it is practical in that the disadvantages associated with the bulging deformation of the connector as described above are avoided. Given.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the interconnector of the present invention, and FIG. 2 is a sectional view when a pressure load is applied to the interconnector. DESCRIPTION OF SYMBOLS 1... Conductive part, 2... Insulating part, 3... Connector part, 4... Support layer, 5... Second support layer.

Claims (1)

[Scope of utility model registration request] The conductive rubber-like elastic material layer and the insulating rubber-like elastic material layer are laminated alternately and in multiple layers so that their joint surfaces are parallel to each other. An insulating rubber-like elastic body having a rubber hardness lower than that of the rubber-like elastic body is provided as a support layer, and a rubber-like elastic body having a rubber hardness higher than that of the rubber-like elastic body forming this support layer on the side peripheral surface of this support layer. A press-contact clamp type interconnector comprising a second support layer made of an insulating rubber-like elastic material.