JPS61133586A - 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] (Industrial Application Field) The present invention is suitable for mounting connectors, particularly electronic components having multiple contacts such as ICs and LSIs, on opposing wiring boards. The present invention relates to a connector using elastomer.

(Prior art) Soldering is widely used to connect multiple terminals of small electronic components such as ICs and LSIs to multiple circuit terminals on a printed circuit board, but soldering is widely used for connecting multiple terminals of small electronic components such as ICs and LSIs to multiple circuit terminals on a printed circuit board. There are some parts, such as those for which soldering is inappropriate due to the necessity of parts replacement, and various mechanical parts having socket structures have been proposed for this purpose.

For IC sockets, especially sockets for leadless chip carriers (hereinafter abbreviated as LOO), a large number of vials are driven into a synthetic resin mounting frame to ensure a good connection between the LOO and the vials. In order to do this, bottles with a spring material and structure are widely used, but these have complicated structures and are expensive because they use special metal materials. This is a major obstacle to the spread of implementation methods.

Therefore, a method of making this type of connection using an anisotropic conductive sheet in which conductive fibers or thin metal wires are oriented in insulating rubber has been proposed;
After placing this anisotropic conductive sheet on electronic parts such as IQKp/,7
Since it is necessary to press-fit with a pressure greater than 100%, it is necessary to make the frame material strong in order to construct this circuit, and since this pressure is constantly applied to these parts, there is a risk of damage to the parts. It has the disadvantage of being easy to occur.

(Structure of the Invention) The present invention relates to a connector that is inexpensive and has a simple structure that solves these disadvantages, and this connector is made by penetrating thin metal wires in an insulating base sheet with the thin metal wires oriented in the thickness direction. It is characterized in that conductive protrusions having rubber elasticity are provided on one or both sides of the arranged anisotropically conductive sheet.

To explain this, the present inventors investigated various methods of connecting terminals such as I (1% LSI) and printed circuit board terminals, and found that an anisotropically conductive material with thin metal wires oriented in an insulating base sheet A connector is a sheet with conductive protrusions with rubber elasticity on the surface of the sheet, and if this is placed on top of a workpiece, LSI, etc., and then a wiring board is crimped onto it, these can be easily electrically connected. Since this anisotropic conductive sheet has conductive protrusions with rubber elasticity, the pressure that must be applied to the circuit element consisting of the IJI and the wiring board in order to achieve this conductivity is low. It was discovered that this required only a small force of, for example, 3 KP/d or less, making it possible to reduce the weight of the frame used to make it, and also to prevent damage to electronic components. The present invention was completed by conducting research on materials, etc.

The anisotropically conductive sheet constituting the connector of the present invention is a well-known one, and is one in which thin metal wires are oriented substantially in the thickness direction of an insulating base sheet and are arranged through the sheet.
This insulating base material includes natural rubber, ethylene propylene rubber, 8BR, NBR.

Examples include synthetic rubbers such as silicone rubber, thermoplastic resins such as polyethylene, polypropylene, polyvinyl chloride, and polyphenylene sulfide, and thermosetting resins such as unsaturated polyesters, phenolic resins, urea resins, melamine resins, epoxy resins, and polyimide resins. However, it is preferable to use silicone rubber, epoxy resin, or polyimide resin, which have various electrical properties. Also,
The fine metal wires include metal wires made of copper, brass, phosphor bronze, stainless steel, tungsten carbide F, lead, solder alloy, etc., or the whisker method, vapor deposition method, melt spinning method, drawing method, shearing method, cutting method. Examples include metal fibers made of the same kind of metal as the above-mentioned metal wires made of It is preferable to use phosphor bronze, brass, or stainless steel because they are durable, strong, and have good wire-making processability.

This anisotropic conductive sheet is produced by, for example, mixing thin metal wires with the above-mentioned insulating base material and forming the mixture into a sheet using an extruder or roll, and orienting the thin metal wires in the extrusion direction. A method is to laminate, heat press to integrate, and then cut this at right angles, or to injection mold a mixture of an insulating base material and a thin metal wire in a circumferential direction into a mold that is formed into a disk shape. This molded product can then be made by slicing it along its circumference, which involves applying an insulating base material around the thin metal wire,
It is also possible to make a block body by arranging and overlapping them at appropriate intervals, cold-pressing them, degassing them under pressure, and then heating and pressing them to form an integrated molded product.

The anisotropically conductive sheet produced in this way is said to have thin metal wires arranged side by side in an insulating base material, and these thin metal wires have a diameter of 10 to 50 μm, and these thin metal wires are
The sheets are preferably arranged side by side at a pitch of 11 to 0.511j1, and the thickness of these sheets is 0.2 to 0.511j1.
It may be 2u.

On the other hand, the conductive protrusions formed on the surface of this anisotropic conductive sheet need to have rubber elasticity, so they are made of rubber-like material mixed with metal powders such as carbon black, copper, silver, and nickel. It is preferably made of synthetic rubber such as ethylene propylene rubber, 8BR% NBR, silicone rubber, etc. The shape and structure of this conductive protrusion can be arbitrary, but it is usually a conical or cylindrical shape, because it is good to have the same spacing as the contact points of IO, LSI, etc. Pitch spacing between 0.2 and 2.5 vux pitch, preferably 1.27
11J + pitch, but the diameter of each protrusion is Q, 1 to 1.0 m, height 0.2 to 1,
It may be 0 Km. Note that this conductivity is 1
It may be about 0 to 10 Ω, and this molding may be performed by press molding or injection molding with an anisotropically conductive sheet inserted, but preferably by screen printing method, and the above-mentioned synthetic A conductive material made by mixing conductive powder with rubber or thermoplastic elastomer, such as kerosene, dissolved in an organic solvent such as toluene, xylene, or carpitol acetate, or a conductive material made by mixing conductive powder into a synthetic rubber that is liquid at room temperature. Printing the material offers the advantage that the shaped conductive projections are easily adhered to the anisotropically conductive sheet.

Next, the connector of the present invention will be explained based on the attached drawings.

Figure 1a) shows a perspective view of an anisotropic conductive sheet strand obtained by cutting a thin metal wire 1 into an insulating base material 2 along a plane perpendicular to the same direction at 4.4'. and this one is 4
! ? Since the metal wire 1 penetrates the insulating base material 2 in its thickness direction, it has conductivity on its front and back surfaces, but adjacent thin metal wires are insulated by the insulating base material. Therefore, the conductive protrusions having rubber elasticity are formed on both sides of the anisotropic conductive sheet 5 shown in Figure 1 (b). 6 is a longitudinal cross-sectional view of a connector 7 of the present invention provided with a conductive protrusion 6, which is adhesively fixed to an anisotropic conductive sheet 5 by, for example, a screen printing method.
The size, shape, and structure may be arbitrarily determined depending on the terminal of the electronic component to be connected.

In addition, Figure @3 shows a vertical sectional view of a connecting device 9 for connecting the connector 7 and the chip carrier 8 of the present invention, and this shows the chip carrier 8 on the connector 7.
If the cover body 12 having the spring material 11 is closed after stacking them and putting them into the IO socket main body 10, the chip carrier 8 will be pressed by the spring material 11, so the chip carrier 8 and the connector 7 will be completely connected. .

Next, examples of the present invention will be given.

Example Commercially available silicone rubber compound KF-971U [Shin-Etsu Chemical Co., Ltd. 1? Co., Ltd. product name] Vulcanizing agent ○-8 in 10 parts
[Add 32.0 parts of the company's product name and mix evenly to obtain a pace compound wand with a diameter of 30 μm and a length of 30 μm.
0.0mm phosphor bronze fine wire with a pitch of 0.11
Make a block-like object of 50X50X300 by stacking them in parallel horizontally and vertically so that it becomes 111, and
After degassing by pressing for 24 hours at a pressure of oKy/crl, 180℃, 100KP/cn? The silicone rubber was vulcanized by heat and pressure under the following conditions to create an integrally molded product.

Next, this block was cut to a thickness of 2IjI in a direction perpendicular to the orientation direction of the thin metal wires to make a 50x50x2 anisotropic conductive sheet, and a liquid silicone rubber compound KE-1925 [Shin-Etsu Chemical Co., Ltd.] was applied on this sheet. ) product name] 100 parts with 200 parts of senshi powder added to it using a silicone-based printing paste and screen printing to a diameter of O,
A connector was made by providing a conductive protrusion having rubber elasticity with a fi of 5 m and a height of 0.5 B.

Next, using this connector as shown in FIG.
When a conventional anisotropic conductive sheet having no conductive protrusions is used, reliability of conduction cannot be obtained unless the pressure contact force by the spring material 11 is 1 oKy/c1 or more. When a large load was applied, the socket body was destroyed, but when the connector according to the present invention was used, the pressure contact force was only 3 KP/eJ, and therefore the socket body could be easily designed.

[Brief explanation of the drawing]

Figure 1 a) is a perspective view of a block body for making an anisotropically conductive sheet used in the connector of the present invention, gg1 Figure b
) is a perspective view of an anisotropically conductive sheet obtained from this block body, FIG. 2 is a vertical cross-sectional view of the connector of the present invention, and FIG. 3 is a vertical cross-sectional view of the connection between the connector of the present invention and electronic components. This is what is shown. DESCRIPTION OF SYMBOLS 1... Metal thin wire, 2... Insulating base material, 6... Conductive protrusion, 7... Connector, 8... Chip carrier, 10... IO socket, 11... Spring material , 12... Lid body, 13... Bottle for installing a socket, 14... Base body, 15... Base conductive part.

Claims (1)

[Claims] 1. An anisotropically conductive sheet in which thin metal wires are oriented substantially in the thickness direction of an insulating base sheet and are arranged through the sheet, and conductive protrusions having rubber elasticity are provided on one or both sides of the anisotropic conductive sheet. A connector 2 characterized in that the anisotropic conductive sheet has a diameter of 10 mm.
2. The connector according to claim 1, wherein thin metal wires of ~50 μm are oriented in silicone rubber at a pitch of 0.1 to 0.5 mm. 3. Diameter 0.1-1.0mm, height 0.1-1.0mm
The connector according to claim 1, wherein the conductive protrusions are provided at a pitch of 0.2 to 2.5 mm. 4. The connector according to claim 1, wherein the conductive protrusion has a conical shape.