JP3202956B2 - IDC connector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press-fit connector used for connection between a liquid crystal display (COG, TAB type) and a circuit board or between electronic circuit boards.
You .

[0002]

2. Description of the Related Art In recent years, a U-shaped metal wire connector having a large number of conductive thin wires arranged in parallel in a U-shape on an outer peripheral surface of an elastic insulating material has been used for connection between electronic circuit boards. ing. This U-shaped metal wire connector (hereinafter, simply referred to as a connector) belongs to a pressure contact type connector, and is elastically and softly connected by the pressure contact. Conventionally, as shown in FIG. 3, a connector of this type has a large number of conductive thin wires d arranged in parallel in a U-shape on an outer peripheral surface of an insulating rubber sheet c provided on an insulating elastomer b. To produce a long connector material e, and then cut with a cutting blade f to obtain a connector a.

[0003]

The connector thus obtained has a conductive thin wire having a diameter of 30 μm arranged in parallel.
m ~ 40μm and the arrangement pitch is extremely narrow, 50μm ~ 100μm, so cut burrs of the conductive thin wire at the cut end,
The end of the connector was not necessarily electrically insulated, resulting in a high product failure rate.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and does not generate a cut burr of a conductive thin wire at a cut end, and causes a circuit short-circuit with a component disposed around a connector during pressure welding. The object of the present invention is to provide a press-fit type connector whose ends are reliably electrically insulated.

[0005]

According to the connector of the present invention, an insulating rubber sheet is coated in a U-shape in a sectional view around the insulating elastomer along the longitudinal direction, and the outer peripheral surface of the insulating rubber sheet is provided. A large number of conductive thin wires are arranged in the width direction in parallel at an equal pitch on the upper side, and have insulating ends at both ends.

According to the method for manufacturing a connector of the present invention, a conductive thin wire is spirally arranged over a predetermined length on an unvulcanized insulating rubber sheet fixed on a rotating drum, and then further rotated. rotate the drum, after a predetermined distance moves the supply portion of the electroconductive thin line on the insulating rubber sheet surface, arranged continue across the electroconductive thin line to a predetermined length, the operation
After repeatedly arranging the conductive thin wires , the conductive thin wires are adhered to the insulating rubber sheet and vulcanized, and then cut in a direction crossing the conductive thin wires to form conductive sheet pieces. Is placed in a mold having a U-shaped groove with the conductive thin wire side facing the molding surface, and after molding into a U-shape, the sponge silicone material is placed thereon, and heated and pressurized to foam the connector. The method is to form a material and cut it between the moving portions at the predetermined distance.

[0007] In the manufacturing method, the arrangement of the conductive thin wires may be such that the supply section of the conductive thin wires is moved at a constant speed in parallel with the axial direction of the rotating drum, or the rotating drum is moved at a constant speed. Furthermore, the rotating drum and the supply unit may be moved respectively. However, considering the miniaturization of the conductive thin wire arrangement device, the simplification of the mechanism, and the arrangement accuracy, the method of using one supply unit and moving it is most preferable. preferable. Also,
The removal of the conductive thin wire at the insulating end portion is performed before the adhesive vulcanization, so that the workability is good and the mass productivity is excellent.

The insulating rubber sheet used in the present invention comprises:
Polyethylene terephthalate, polybutylene terephthalate, on a film such as a polyester film or polyimide film such as polyethylene nitrile, a rubber material selected from chloroprene rubber, silicone rubber, isoprene rubber, butyl rubber, fluorine rubber, urethane rubber, etc., for example, topping which was applied to result in a thickness 50 to 200 [mu] m about laws, the variation of the thickness is preferably not more than ± 5 [mu] m. This is due to the thickness variation (Rmax
Is larger than 10 μm, the arrangement pitch of the conductive thin wires tends to be disordered. In order to obtain such a rubber sheet, the rubber material kneaded with two or three calender rolls is preferably fractionated on a non-stretchable (5% or less) base material sheet such as PET. As the rubber material, silicone rubber excellent in environmental resistance characteristics, mechanical characteristics, and the like is preferable.

The insulating rubber sheet used in the present invention comprises:
Polyethylene terephthalate, polybutylene terephthalate, on a film such as a polyester film or polyimide film such as polyethylene nitrile, a rubber material selected from chloroprene rubber, silicone rubber, isoprene rubber, butyl rubber, fluorine rubber, urethane rubber, etc., for example, topping It is applied to a thickness of about 50 to 200 μm by the method, and the thickness variation is preferably ±
It is 5 μm or less. This is the thickness variation (Rmax)
Is more than 10 μm, the arrangement pitch of the conductive thin wires tends to be disordered. In order to obtain such a rubber sheet, it is preferable that a rubber material kneaded with two or three calender rolls is fractionated on a non-stretchable (5% or less) base material sheet such as PET. As the rubber material, silicone rubber excellent in environmental resistance characteristics, mechanical characteristics, and the like is preferable.

Examples of the insulating elastomer include various elastomer materials such as butadiene-based copolymers such as butadiene-styrene, butadiene-acrylonitrile, and butadiene-isobutylene; chloroprene polymers;
It is selected from vinyl acetate copolymer, polyurethane, silicone rubber and the like, and among them, silicone rubber which is excellent in heat resistance, cold resistance, weather resistance, electric insulation and non-toxic as an elastomer material is preferable.

As the conductive fine wire, gold, gold alloy, platinum,
Fine metal wires made of copper, aluminum, aluminum-silicon alloy, brass, phosphor bronze, beryllium copper, nickel, molybdenum, tungsten, stainless steel, etc., or materials excellent in conductivity and environmental resistance such as gold, gold alloy, rhodium, etc. Thin metal wires plated with, fine wires made of conductive synthetic resin wire or carbon fiber, or gold, gold alloy, and fine wires plated with materials having excellent conductivity and environmental resistance such as rhodium can be used.
Metal wires and gold-plated metal wires having excellent conductivity, environmental resistance, and low contact characteristics are preferably used.

On the other hand, if the diameter of the conductive thin wire is too large, a fine wiring pitch cannot be obtained. Further, when the conductive thin wire is formed into a cylindrical shape, the bending elasticity of the conductive thin wire is too strong, and the conductive thin wire is formed in a circular shape along the mold. The thickness of the conductive thin wire is 3 to 500 μm, which is easy to mold and easy to handle, and is preferably 10 to
The thickness is preferably 100 μm, more preferably 15 to 50 μm, and 70 to 80%, preferably 40 to 60% of the thickness of the conductive fine wire is embedded on the unvulcanized insulating rubber sheet layer. Thickness is preferred.

[0013]

EXAMPLE A method of manufacturing a connector according to the present invention will be described with reference to the manufacturing process diagram of FIG. First, silicone rubber compound KE-153U (Shin-Etsu Chemical Co., Ltd., trade name) 10
0 parts by weight of vulcanizing agents C-19A and 19B (same as above)
5, 2.5 parts by weight and 1.0 part by weight of silane coupling agent KBM403 (same as above)
As shown in FIG. 2A, a non-stretchable base material having a thickness of 50 μm and a width of 350 mm was formed by a calender roll (not shown).
On a long base sheet 6 made of PET sheet
Sheeting was performed so as to have a thickness of 0 μm and a width of 300 mm to form an insulating rubber sheet 2.

Next, the obtained sheet is cut into a length of 600 mm, and the sheet is fixed on the peripheral surface of a rotating drum having an outer circumference of 600 mm so that the insulating rubber sheet 2 is located outside. A conductive thin wire 3 made of a brass wire having a wire diameter of 40 μm and having a gold-plated surface on the surface 2 is supplied from a feeding device onto a rotating rotary drum, and a supply portion of the brass wire is supplied in the axial direction of the rotary drum. After moving the brass wire 10 mm in the axial direction at a pitch of 100 μm while moving it 100 μm per rotation, the rotating drum is further rotated one turn to move the brass wire supply unit 0.4 mm in the axial direction of the rotating drum, and thereafter Brass wires are arranged 10 mm in the axial direction at a pitch of 100 μm. Repeat this operation to stop the drum when the brass wire arrangement on the entire surface of the sheet is completed, remove it from the rotating drum,
Fig. 2 (b)
Was obtained.

After this sheet is heated in an oven at 120 ° C. for 30 minutes to perform primary vulcanization, the base sheet 6 is peeled off and removed, and further heated in an oven at 195 ° C. for 4 hours to perform secondary vulcanization. Vulcanization was performed to obtain a sheet shown in FIG. Next, this sheet was cut in a direction crossing the conductive thin wire 3 (brass wire) to produce a core material sheet 7 shown in FIG. 2D having a width of 4.5 mm and a length of 300 mm. Further, as shown in FIG. 2E, the conductive wire side of the core material sheet 7 was set in the lower molding die 8 having a U-shaped groove with the molding portion facing the molding surface.

On the other hand, silicone rubber compound KE-151
U 100% by weight of Shin-Etsu Chemical Co., Ltd., vulcanizing agent
A sponge silicone rubber raw material obtained by adding and mixing 0.5 parts and 2.0 parts by weight of C-1 and C-3 (same as above) and 1.8 parts by weight of a foaming agent 2,2-azobisisobutyronitrile, respectively, was subjected to a predetermined process using a calender roll. Sheeting. After cutting the sponge silicone rubber raw material to a predetermined width and length, the cut product 9 is placed on the insulating rubber sheet 2 of the core sheet 7 as shown in FIG. Upper mold
10 and heated at 175 ° C. for 5 minutes under a pressure of 10 kg / cm ² to foam the sponge silicone rubber raw material into an insulating elastomer 4 (see FIG. 2 (g)). Performed post-curing for 1 hour at
A long connector material 11 shown in (h) was obtained. This connector material 11 is cut (preferably cut at the center of the moving portion) at the 0.4 mm moving portion where the insulating rubber sheet 2 on which the conductive thin wire 3 is not disposed is exposed, as shown in FIG.
The connector 1 shown in (j) was manufactured. No detachment of the conductive thin wire 3 and no burr were observed at the cut portions at both ends of the obtained connector 1.

Comparative Example In the same manner as in Example 1, a silicone rubber raw material was sheeted on a long base sheet 6 made of a PET sheet to form an insulating rubber sheet 2 and cut into a length of 600 mm. The insulating rubber sheet 2 is fixed on the outer surface of a rotating drum having an outer circumference of 600 mm so that the insulating rubber sheet 2 is on the outer side, and the conductive rubber is made of a 40 μm-diameter brass wire having a gold-plated surface on the insulating rubber sheet 2. While supplying the thin wire 3 onto the rotating drum rotating from the delivery device,
Feed the brass wire in the axial direction of the rotating drum at 100
while moving in the axial direction at a pitch of 100 μm,
When the arrangement on the entire surface of the sheet was completed, the drum was stopped and removed from the rotating drum.

Thereafter, the same processing as in the first embodiment is performed, and a long connector material in which the conductive thin wires 3 are densely arranged.
I got 11 '. This long connector material 11 'was cut into a predetermined length to produce a connector 1' shown in FIG. 2 (k). In this long connector material 11 ', since the conductive thin wires 3 are densely arranged in a U-shape at a pitch of 100 [mu] m over the entire length, 10% of the connector 1' cut out therefrom has a cut portion. Detachment of the conductive thin wire and generation of burrs were observed, and furthermore, the insulating end portions 5 were not provided at both ends, and insulation with components around the connector was insufficient.

[0019]

The connector of the present invention has insulated ends at both ends, so that the ends are reliably electrically insulated, and the electrical insulation from components around the connector is sufficient.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a connector of the present invention.

FIGS. 2A to 2J are manufacturing process diagrams sequentially showing manufacturing processes of the connector of the present invention, and FIG. 2K is a perspective view showing a connector of a comparative example.

FIG. 3 is a schematic explanatory view showing how a conventional connector is obtained by cutting a long connector material.

[Explanation of symbols]

 1, 1 ', a, connector, 2, c, insulating rubber sheet, 3, d, conductive thin wire, 4, b ... Insulating elastomer, 5. ····· Insulating end, .... substrate sheet, 7. ···· Core material sheet; ······ Lower mold for molding, ···· Cut products, 10 ··············································· Connector material, f. ... Cutting blade.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) H01R 11/01 501 H01R 43/00

Claims (1)

(57) [Claims] 1. An insulating rubber sheet is coated around an insulating elastomer along this length direction in a U-shape in cross section.
On the outer peripheral surface of this insulating rubber sheet , a diameter of 3 to 500 μm
A press-connecting connector characterized in that a number of conductive thin wires having the following characteristics are arranged in parallel at equal pitches in the width direction, and have insulating ends at both ends.