JP2001266990A - Electric connector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric connector wherein an impurity is hard to stick to an electric contact unit, and an imperfect contact is hard to be generated even if the electric contact of the first connector and a conductor of the second connector repeat several thousand times of contacts (insert and release). SOLUTION: This provision can be achieved by the followings; in the first connector 10 and the second connector 20 are removably contacted so that plural electric contacts 12 in a single face of the first connector 10 and plural electric contactors 30 in a single face side of the second connector 2 are made to be electrically connected, and the electric contactors 30 are installed onto a conductor 26 of a circuit board 22 of the second connector 20, and slit-formed notch parts are installed on the circuit board 22 surrounding the conductor 26 to let the conductor 26 have an elasticity on the conductor 26 parts, by installing at least one square pillar-shaped protruding parts 31 on the electric contactors 30 of the second connector 20, the electric connecter of the first connecter will slide on edges of square pillar-shaped protruding parts 31 installed on the electric contactors when the first connector and the second connector are fitted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrical connector in which a plurality of electrical contacts and a plurality of electrical contacts are electrically connected at one time, and in particular, the first connector is soldered to the second connector. It relates to prevention of adhesion to a contact portion.

[0002]

2. Description of the Related Art FIG.
Will be described. As one of the electrical connectors, for example, FIG.
As shown in FIG. 1, the first connector 10 (Ball Grid)
Array (BGA)) and the second connector 50 (BGA
The first connector 10 has a plurality of electrical contacts 12 formed of spherical projections such as solder provided on one side of the first connector 10 and a second electrical contact 12.
There is one in which a plurality of electrical contacts 52 provided on one side of a connector 50 are electrically connected. 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.

[0003] The first connector 10 is made of ceramics or a rigid hard resin substrate, and a plurality of electrical contacts 12 made of spherical projections such as solder (PbSn) are provided on one side of the hard resin substrate. . This electrical contact 12
Are formed by reflowing solder balls on lands of a hard resin substrate. Also, the second connector 50
Is provided with a plurality of electric contacts 52 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 52 is connected to the second connector 50.
Is provided on a conductor 26 of a substrate 22 (such as an FPC), and a slit-shaped cutout 24
To provide a structure to give elasticity to the conductor 26,
With this structure, variations in the height of the electrical contacts 12 of the first connector 10 can be absorbed. Since the electric contact 52 is a contact portion, it is generally subjected to a surface treatment such as gold plating.

[0004]

When the first connector and the second connector are fitted together, a recess is provided in the contact piece of the second connector as described in Japanese Patent Application Laid-Open No. 2000-30827 to obtain stable contact. Although a proposal has been made, this proposal does not solve the problem described below because the second connector does not slide when the first connector and the second connector are fitted.
Since the second connector is a connector for inspecting the first connector 10 as described in the related art, the second connector is contacted with thousands of first connectors 10. Therefore, the following problems occurred. The problem will be described with reference to FIG. When the electrical contacts 12 of the first connector 10 and the electrical contacts 52 of the second connector come into contact with each other several hundred times, the solder (PbSn) forming the electrical contacts 12 is formed on a conventionally-treated surface treatment layer such as gold plating. )
However, there is a problem to be solved, such as adhesion of the particles, which may cause poor contact. If the solder adheres to the surface treatment layer of the electric contact 52, it will be dropped once every hundred or thousands of times by a brush or the like. However, there is also a problem that the solder of the attached matter 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. In order to solve the above problems, the present applicant has filed Japanese Patent Application No. 2000-6
No. 4241 proposes to provide at least one or more ridges on the electrical contacts of the second connector. However, with the current technology, it is not possible to obtain the top edge of the mountain-like projection as expected, and therefore the amount of biting into the electrical contact of the first connector is small, and the attached solder may be scraped off. I could not do it.

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 solder and its oxidized impurities 54 are unlikely to adhere to the surface treatment layer of the electrical contact and in which 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 a conductor of a substrate of the second connector, and a slit-shaped cut portion is provided in a substrate around the conductor to form a conductor portion. In the electrical connector having elasticity, at least one or more prismatic protrusions are provided on the electrical contact of the second connector, and the first connector is fitted when the first connector and the second connector are fitted. The electrical contact of the connector can be achieved by sliding the corner of the prismatic protrusion provided on the electrical contact of the second connector. Further, it is preferable that the sliding direction of the electrical contact of the first connector and the prismatic protrusion are arranged in parallel or non-parallel. By arranging in this way, the solder attached at the time of the previous contact can be reliably eliminated forward. In addition, as a method of forming the prismatic protrusion, first, an insulating layer is provided on the conductor or the protective coating layer of the second connector, and then a slit groove is provided in the insulating layer to reach the conductor, It can be formed by gradually plating the inside of the slit groove to a thickness not exceeding the thickness of the insulating layer, and finally removing the insulating layer.

[0007]

When at least one or more prismatic protrusions are provided on the electrical contacts 30 of the second connector, the first connector 10
When the first connector 10 is in contact with the second connector 20,
Since the electrical contact 12 slides on the electrical contact 30 of the second connector 20, the solder previously attached at the time of contact is removed forward (removed so as to be scraped off). The reason why the electrical contact 12 of the first connector 10 slides on the electrical contact 30 of the second connector 20 when the first connector 10 and the second connector 20 are fitted will be described. The sliding as described above is performed by disposing an elastic material 39 such as silicon on the back side of the metal conductor portion and slit-shaped cutout 2 in the substrate 22 around the conductor 26 of the second connector 20.
4, the electric contact 30 of the second connector 20 is displaced downward by a contact force that presses the electric contact 30 of the second connector 20 against the electric contact 12 of the first connector 10, and the contact position is displaced to slide. I do. The movement of this sliding will be described with reference to FIG. The electric contacts 12 of the first connector 10 are connected to the electric contacts 3 of the second connector 20 with a constant force.
0, the first connector 10 and the second connector 2
The position where 0 comes in contact is point A (the state in FIG. 1). Thereafter, when the second connector 20 is continuously pressed with a certain force, the second connector 20 is provided with the elastic material layer 39 and the cutout portion 24 as described above. When the child 30 is displaced downward in FIG. 4, the electric contact 30 of the second connector 20 is pushed down from the point A to the point A ′. However, since the first connector 10 is guided by the socket structure, the first connector 10 cannot move greatly in the front, rear, left and right directions.
The electric contact 12 of the first connector 10 is moved only to be pressed vertically downward. Therefore, when the electric contacts 30 of the second connector are displaced, they come into contact at the point B (the state in FIG. 2). That is, the electric contact 12 of the first connector 10 has moved on the electric contact 30 of the second connector 20 while being pressed from the point A ′ to the point B with a constant force. This movement is sliding, and the moving direction is the sliding direction.

[0008]

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 longitudinal sectional view of an electrical connector according to the present invention immediately before sliding in which a first connector and a second connector are fitted, and FIG.
FIG. 2 is a partially enlarged longitudinal sectional view of the electrical connector according to the present invention when sliding with the connector is completed. FIG. 3 is a partially enlarged cross-sectional view of the electrical connector according to the present invention immediately before sliding in which the first connector and the second connector are fitted, and FIG. 4 is an explanatory view of sliding of the electrical contacts of the first connector. It is. FIG.
(A) is an arrangement | sequence state figure of the prismatic convex part of the 2nd connector of the electrical connector of FIG. 1, (B) is another arrangement state figure. FIG. 6 is a drawing for explaining a method of forming the prismatic protrusions. 1 to 5 show one embodiment of an electric connector according to the present invention. In the drawings, reference numeral 10 denotes a first connector made of a ceramic or rigid resin substrate having rigidity, and reference numeral 12 denotes a first connector. A plurality of electrical contacts made of spherical protrusions such as solder provided on one side of one connector 10, a second connector 20 made of a board 22 made of a soft resin having appropriate rigidity, and a 26 provided on one side of the board 22. A conductor made of a disc-shaped metal layer, 28 is a protective coating layer made of an insulating material or the like provided on the conductor forming side of the substrate 22, 30 is an electric contact provided on the conductor 26, 31 is an electric contact 30 It is a prismatic projection provided.

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 FIG. 1, 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, to obtain a desired portion as shown in FIG. Conductor 26 is provided. Therefore, a large number of conductors 26 can be formed at very low cost and with almost no bulk. Of course, the portion of the lead wire 34 connected to the conductor 26 can also be formed by the same printed wiring pattern forming method.
When a plurality of conductors 26 are arranged at a high density, the wiring space on the front side of the substrate may be insufficient.
And can be formed on the back side of the substrate in a form communicated therewith.

An electrical contact 30 made of a material having good conductivity is provided at a contact portion of the conductor 26 with the first connector 10. The electric contact 30 is provided on the conductor 26 by plating or the like. As the material of the conductor 26, any material may be used as long as the material has good conductivity.
Examples include brass, beryllium copper, and phosphor bronze.

At least one or more prismatic projections 31 are formed on the electric contacts 30 of the second connector 20 so that solder attached to the electric contacts 12 of the first connector can be removed. The first connector 10 and the second connector
When the connector 20 is fitted, the electrical contact 12 of the first connector 10 slides on the corner of the prismatic protrusion 31 provided on the electrical contact 30 of the second connector 20, and the corner portion is slightly It is better to be sharp. That is, the prismatic protrusions 31 are for removing the attached solder. The upper surface of the prismatic projection 31 is preferably substantially flat,
Considering the role of the raised portion 31 and the wear, the edge portion preferably has a substantially right angle. The amount of protrusion of the protruding portion 31 may satisfy the above-mentioned role, and about 0.1 to 0.2 mm is sufficient. The number of the prismatic protrusions 31 is 1st.
Considering the positional relationship (displacement) between the electrical contacts 12 of the connector 10 and the electrical contacts 30 of the second connector 20, it is desirable that there be a plurality of them. When a plurality of prismatic protrusions 31 are provided, the surface of the electric contact 30 has a pulse shape. In consideration of the above-described operation and role, it is preferable that the sliding direction of the electrical contact 12 of the first connector 10 and the prismatic protrusion 31 of the second connector 20 be arranged in parallel or non-parallel. By arranging in this way, the solder attached at the time of the previous contact can be reliably eliminated forward.

Next, a method of forming the prismatic projection 31 will be described with reference to FIG. First, an insulating layer 33 is provided on the conductor 26 or the protective coating layer 28 of the second connector 20. That is, the insulating layer 33 may be provided directly on the conductor 26, or the protective coating layer 28 may be provided on the conductor 26 and provided thereon. The thickness of the insulating layer 33 is 15 to 100 μm. Next, a slit groove 42 reaching the conductor 26 is provided in the insulating layer 33. The slit groove 42 is provided parallel or non-parallel to the sliding direction of the electrical contact 12 of the first connector 10 as shown in FIG. The slit groove 42 can be formed by laser processing or the like, but may be provided by any method as long as the slit groove 42 can be installed.
In the case of non-parallel, considering the role of the raised portion 31, the first
The angle is preferably about 5 ° to 20 ° with respect to the sliding direction of the connector 10. Next, plating is gradually performed on the inside of the slit groove 42, and the plating is performed to a thickness not exceeding the thickness of the insulating layer 33. At this time, the upper surface of the plating is preferably substantially flat. Finally, the insulating layer 33 is removed with an alkaline solution (such as sodium hydroxide), so that the prismatic protrusions 31 are formed.
Can be created. (If the number of the slit grooves 42 is plural, the surface of the electric contact 30 has a pulse shape.)

Since the substrate 22 is provided with a slit-shaped cut portion 24 and the conductor 26 and the electric contact 30 of the present invention are made elastic, as shown in FIG. 2 Set the connectors 20 together
If the electric contact 30 is brought into contact with the electric contact 12 formed of a spherical projection of the first connector 10, the conductor 26 and the electric contact 30 follow the electric contact 12 and elastically contact with each other. Even if there is some height irregularity on the 12 side, the connection is stable.

That is, a highly reliable electrical connection can be obtained. At this time, since the elasticity of the conductor 26 and the electric contact 30 side depends on the elasticity of the tongue-shaped movable small portion 36 of the substrate 22, the hardness of the substrate 22 made of a soft resin having appropriate rigidity as described above is It is necessary that the movable piece portion 36 has such a hardness that sufficient elasticity is provided.

[0016]

As is apparent from the above description, the electrical connector according to the present invention has the following excellent effects. (1) A protruding prism 31 is provided on the surface of the electric contact 30 applied to the conductor 26, and the second connector 20 is connected to the first connector 10 when the first connector 10 and the second connector 20 are fitted. Since the electrical contact 12 is slid in the sliding direction, the solder attached at the time of the previous contact can be easily removed (scraped off). (2) Since the prismatic protrusions 31 are arranged parallel or non-parallel to the sliding direction of the electrical contacts 12 of the first connector 10, the solder residue attached at the time of the previous contact is more reliably eliminated to the front. can do. (3) The method of forming the prismatic protrusions 31 is as follows. First, an insulating layer 33 is provided on the conductor 26 or the protective coating layer 28 of the second connector 20, and then a slit reaching the insulating layer 33 up to the conductor 26 is provided. A groove 42 is provided, and then plating is gradually performed in the slit groove 42 to a thickness not exceeding the thickness of the insulating layer 33,
Finally, it can be easily formed by removing the insulating layer 33, and since the edge portion of the prismatic projection 31 is almost a right angle, it is hard to wear.

[Brief description of the drawings]

FIG. 1 is a partially enlarged longitudinal sectional view of an electrical connector according to the present invention immediately before sliding in which a first connector and a second connector are fitted.

FIG. 2 is a partially enlarged longitudinal sectional view of the electrical connector according to the present invention at the completion of sliding when the first connector and the second connector are fitted.

FIG. 3 is a partial enlarged cross-sectional view of the electrical connector according to the present invention immediately before sliding in which the first connector and the second connector are fitted.

FIG. 4 is an explanatory view of sliding of the electrical connector according to the present invention.

FIG. 5A is a view showing an arrangement of prismatic protrusions of a second connector of the electrical connector of FIG. 1; (B) It is an arrangement state figure different from (A).

FIG. 6 is a drawing for explaining a method of forming a prismatic protrusion.

FIG. 7 is a partially enlarged longitudinal sectional side view of a conventional electrical connector.

FIG. 8 is a partially enlarged plan view showing a board of a second connector of the electrical connector of FIG. 5 for explaining a problem.

[Explanation of symbols]

 1, 60 Electrical connector 10 First connector 12 Electrical contact 20, 50 Second connector 22 Substrate 24 Slit-shaped cutout 26 Conductor 28 Protective coating layer 30, 52 Electrical contact 31 Projection 32 Opening 33 Insulating layer 34 Lead wire 36 Tongue-shaped movable small piece part 38 Metal conductor part 39 Elastic material layer 40 Through hole 42 Slit groove 54 Impurity

Claims (4)

[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. An electrical connector, wherein the electrical contact is provided on a conductor of a board of the second connector, and a slit-shaped cut portion is provided in a board around the conductor to make the conductor portion elastic. In the above, at least one or more prismatic protrusions are provided on the electrical contacts of the second connector, and the first connector and the second connector are provided.
An electrical connector wherein the electrical contact of the first connector slides at the corner of the prismatic protrusion provided on the electrical contact of the second connector when the connector is fitted. 2. The electrical connector according to claim 1, wherein the sliding direction of the electrical contacts of the first connector and the prismatic protrusions are arranged in parallel. 3. The electrical connector according to claim 1, wherein the sliding direction of the electrical contact of the first connector and the prismatic protrusion are arranged non-parallel. 4. The prismatic protrusion is provided with an insulating layer on the conductor or the protective coating layer of the second connector, and further provided with a slit groove reaching the conductor in the insulating layer.
4. The electrical connector according to claim 2, wherein the electrical connector is formed by gradually plating to a thickness not exceeding the thickness of the insulating layer, and thereafter removing the insulating layer.