JP2001057263A - Electric connector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an excellent electric connector capable of preventing the adhesion of impurities on an electric contact piece of a second connector, dropping the impurities simply by brushing even if they adhere thereon, and preventing the occurrence of improper contact even if the contact (insertion and pulling out) of an electric contact of a first connector and the electric contact piece of the second connector is repeated several thousand times. SOLUTION: This electric connector is constituted in such a way that a first connector 10 and a second connector 20 abut mutually and detachably to connect a plurality of electric contacts 12 on one face side of the first connector 10 with a plurality of electric contact pieces 26 on one face side of the second connector 20 electrically, the electric contact pieces 26 are provided on a board 22 of the second connector 20, and a slitlike cut-in part 24 is provided on the board 22 around the electric contact piece 26 to give elasticity to an electric contact piece 26 part. In this case, surface treatment is done on the electric contact piece 26 on a side where it comes into contact with the electric contact 12 using such material that prevents scattering of tin, and the material used in the surface treatment is platinum element.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrical connector for electrically connecting a plurality of electrical contacts and a plurality of electrical contacts at a time.

[0002]

2. Description of the Related Art FIG.
Will be described. The electrical connector 60 mainly includes the first connector 10 (Ball Grid Array (BG
A)) and a second connector 50 (referred to as a socket connector that contacts a BGA element or the like) for inspecting the performance of the first connector 10. The first connector 10 that has been inspected is generally attached to a hard board in an electric device (electronic device). For example, as shown in FIG. 4, a first connector 10 and a second connector 50 are detachably butted against one of the electrical connectors to form a plurality of spherical protrusions such as solder provided on one side of the first connector 10. There is a type in which the electrical contact 12 is electrically connected to a plurality of electrical contacts 26 provided on one side of the second connector 50. Although not shown, the first connector 10 and the second connector 20 have a mechanism such as a socket structure and can be detachably mounted.

As shown in FIGS. 5 and 6, the first connector 10 is made of ceramics or a rigid hard resin substrate. On one side of the hard resin substrate, a plurality of electrical connectors made of spherical protrusions such as solder (PbSn) are provided. A contact 12 is provided.
The electric contact 12 is formed by reflowing a solder ball on a land of a hard resin substrate. Further, the second connector 50 is provided with a plurality of electric contacts 26 on one side so as to be able to be electrically connected to the plurality of electric contacts 12 of the first connector 10. The electric contact 26 is provided on the substrate 22 (FPC or the like) of the second connector 50,
A slit-shaped cut portion 24 is provided in the substrate around the electric contact 26 to provide a structure in which the electric contact 26 has elasticity. With this structure, the height of the electric contact 12 of the first connector 10 varies. So that it can be absorbed. Since the electric contact 26 is a contact portion, it is generally subjected to a surface treatment such as gold plating.

[0004]

As described above, since the second connector is a connector for inspecting the first connector 10, the first connector 10 and the second connector are inserted and removed several thousand times. Therefore, the following problems occurred. The problem will be described with reference to FIG. The fact that the first connector and the second connector are inserted and removed several thousand times means that the electric contacts 12 of the first connector 10 and the electric contacts 26 of the second connector contact thousands of times. When the electric contact 12 and the electric contact 26 come into contact with each other several hundred times, the electric contact
There is a problem to be solved such that tin (Sn) of the solder (PbSn) forming No. 2 easily adheres to the surface of the electric contact 26 and causes poor contact. If tin adheres to the surface of the electric contact 26, it will be dropped once every hundreds or thousands of times with a brush or the like. However, there is also a problem that the attached tin does not easily fall off with a brush or the like. If the frequency of brushing is too frequent, the number of man-hours increases, which in turn leads to an increase in cost.

The present invention has been made in view of such a conventional problem, and even if the electric contacts of the first connector and the electric contacts of the second connector repeat contact (insertion and removal) several thousand times. Another object of the present invention is to provide an excellent electrical connector in which impurities are unlikely to adhere to the electric contact and can be easily removed by brushing or the like even if the impurities adhere to the electric contact, and poor contact hardly occurs.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to removably mate a first connector and a second connector to form a plurality of electrical contacts on one side of the first connector and a plurality of electrical contacts on one side of the second connector. And the electrical contact is provided on the substrate of the second connector, and a slit-shaped cut portion is provided on the substrate around the electrical contact to provide the electrical contact. In an electrical connector having an elastic contact portion, it can be achieved by performing a surface treatment with a material in which tin is hardly diffused on the electric contact on the side in contact with the electric contact. The material for the surface treatment is a platinum group element. The use of a platinum group element makes it difficult for tin to diffuse into the electron contact.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An electrical connector according to the present invention will be described with reference to the drawings. FIG. 1 is a partially enlarged vertical sectional side view of an electric connector according to the present invention, and FIG. 2 is a partially enlarged plan view showing a substrate of a second connector of the electric connector of FIG. FIG. 3 is a partially enlarged rear view showing a board of a second connector of the electrical connector of FIG. 1 to 3 show one embodiment of an electric connector according to the present invention.
In the drawing, reference numeral 10 denotes a first connector made of ceramics or a rigid resin substrate having rigidity as in the prior art, and 12 denotes a first connector 1.
A plurality of electrical contacts made of spherical projections such as solder provided on one side of the reference numeral 0, a second connector 20 made of a substrate 22 made of a soft resin or the like having appropriate rigidity, and a disk 26 provided on one side of the substrate 22 Electrical contact comprising a metal layer in the form of a circle, 28
Is a protective coating layer made of an insulating material or the like applied to the electrical contact forming side of the substrate 22, and 30 is a surface treatment layer applied on the electrical contact 26.

In this electric connector, although not shown, the first connector 10 and the second connector 20 have a mechanism such as a socket structure as in the prior art, and can be detachably mounted. Of course, on one surface of the first connector 10 opposite to the electric contact 12 side, necessary wiring such as a printed wiring connected (conductive) to the electric contact 12 side is provided.

First, the second connector 20, which is a point of the present invention, will be described. Second connector 2 of the present invention
In the case of 0, a metal layer portion such as a copper foil previously applied to one side of the substrate 22 is processed by, for example, a printed wiring pattern forming method, which is one of the substrate manufacturing techniques, and as shown in FIG. Are provided. Therefore, a large number of electric contacts 26 can be formed at very low cost and with almost no bulk. Of course, the part of the lead wire 34 connected to the electric contact 26 can also be formed by a similar printed wiring pattern forming method. When a plurality of electric contacts 26 are arranged at a high density, the wiring space on the front side of the substrate may be insufficient in the lead wire 34 portion. Therefore, a through hole 40 is provided at an appropriate position on the substrate 22 to communicate therewith. In this way, it can be formed on the back side of the substrate.

The surface of the electric contact 26 which contacts the first connector 10 is provided with a surface treatment layer 30 in which the tin of the electric contact 12 hardly diffuses. When a platinum group element (element belonging to group VIII of the periodic table) is used as the surface treatment layer 30, tin is difficult to diffuse. That is, considering that tin is difficult to diffuse, the material of the surface treatment layer 30 may be a platinum group element such as ruthenium (Ru), rhodium (Rh), or palladium (P).
d), osmium (Os), iridium (Ir), and platinum (Pt) are preferably used. The material required for the surface treatment layer 30 is appropriately selected from the above six elements in consideration of the fact that tin is hardly diffused and that it is a contact portion, so that it has good conductivity and good surface treatment. You. Considering such a thing, platinum is particularly preferable. The surface treatment layer 30 may be applied to the same extent as the electrical contact 26 of the opening 32. The thickness of the surface treatment layer 30 is 1 to 1
About 0 μm is sufficient.

In this embodiment, since the uppermost electric contact 26 shown in FIG. 2 is used as a ground contact, as shown in FIG.
Ground metal conductor 3 provided on the entire back side of substrate 22
8 is electrically connected. The metal conductor portion 38 is not limited to the case where it is provided on the entire back side of the substrate 22 as shown in the figure, but may be partially provided by forming a pattern. Specifically, a metal layer such as a copper foil may be attached and provided, or a copper foil or the like may be processed by a printed wiring pattern forming method and provided.

The substrate 22 around the electric contact 26 is provided with a substantially U-shaped slit-like cut portion 24 in a substantially contacting manner as in the prior art. This can be easily formed by punching with a press or laser processing. Due to the formation of the notch 24,
Since the electric contact 26 is placed on the tongue-shaped movable small portion 36 located inside the cutout 24 of the substrate 22,
Elastically supported.

In the protective coating layer 28 provided on the side of the substrate 22 on which the electric contacts 26 are formed, as shown in FIG. It may be provided on the entire surface of the substrate 22 except that a similar cut portion is provided in a portion corresponding to the slit-shaped cut portion 24 of the substrate 22. The formation of the protective coating layer 28 can also be easily performed by applying the technique of the printed wiring pattern forming method.

As described above, the electric contact 26 of the present invention includes:
Since it has elasticity, as shown in FIG. 1, the second connector 20 is set against the first connector 10 by abutting it.
If the electric contact 26 is brought into contact with the electric contact 12 of the first connector 10 formed of a spherical projection, the electric contact 26 becomes
The elastic contact follows the electric contact 12, so that even if there is some height irregularity on the electric contact 12 side, the connection is stable.

That is, a highly reliable electrical connection can be obtained. At this time, the elasticity of the electric contact 26 side is
The substrate 2 made of a soft resin or the like having the above-described appropriate rigidity because it depends on the elasticity of the tongue-shaped movable small piece portion 36 of FIG.
The hardness 2 needs to be high enough to give sufficient elasticity to the movable piece portion 36.

[0016]

As is apparent from the above description, the electrical connector according to the present invention has the following excellent effects. (1) Since a platinum group element was used as a material for performing the surface treatment, tin hardly adhered to the electric contact 26 of the second connector 20, and poor contact hardly occurred. (2) Since a platinum group element is used as the material for performing the surface treatment, even if tin adheres to the electric contact 26 of the second connector 20, the adhered substance can be easily removed by brushing. (3) Since a platinum group element is used as a material for performing the surface treatment, tin hardly adheres to the electric contact 26 of the second connector 20, and the number of times of insertion and removal of the first connector 10 and the second connector 20 is 200 in the related art. Although brushing was performed by the number of times, in the present invention, it was possible to increase to 2,000 times. (4) Since the electrical contact 26 is surface-treated with a platinum group element, the electrical contact 26 does not corrode. (5) The electrical contact 26 is subjected to a surface treatment with a platinum group element so that stable contact can be obtained even if the first connector 10 and the second connector are inserted and removed 2,000 times.

[Brief description of the drawings]

FIG. 1 is a partially enlarged longitudinal sectional side view of an electrical connector according to the present invention.

FIG. 2 is a partially enlarged plan view showing a board of a second connector of the electrical connector of FIG. 1;

FIG. 3 is a partially enlarged rear view showing a board of a second connector of the electrical connector of FIG. 1;

FIG. 4 is a partially enlarged longitudinal sectional side view of a conventional electrical connector.

FIG. 5 is a partially enlarged longitudinal sectional view showing a first connector of the electrical connector shown in FIG. 4;

FIG. 6 is a partially enlarged plan view showing a first connector of the electrical connector of FIG. 4;

7 is a partially enlarged plan view showing a board of a second connector of the electrical connector of FIG. 4 for explaining a problem.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 1st connector 12 Electric contact 20, 50 2nd connector 22 Substrate 24 Slit-shaped cut part 26 Electric contact 28 Protective coating layer 30 Surface treatment layer 32 Opening 34 Lead wire 36 Tongue-shaped movable small piece part 38 Metal conductor part 40 Surhole

Claims (2)

[Claims] A first connector and a second connector are detachably butted against each other to electrically connect a plurality of electrical contacts on one side of the first connector and a plurality of electrical contacts on one side of the second connector. The electric contact is provided on the substrate of the second connector, and a slit-shaped cut portion is provided in the substrate around the electric contact to make the electric contact portion elastic. An electrical connector according to claim 1, wherein a surface of said electrical contact on a side in contact with an electrical contact is treated with a material in which tin hardly diffuses. 2. The electrical connector according to claim 1, wherein the material for the surface treatment is a platinum group element.