JPH081817B2 - Cooling structure of electric contact in socket - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling structure for electrical contacts embedded in a socket substrate.

2. Description of the Related Art Conventionally, in an electric contactor which has an electric contact portion and a male terminal portion provided on a contact piece having a spring property, and which obtains a contact force with a mating contact by the spring property of the contact piece, The adjacent surfaces of the electric contacts when the electric contacts were arranged in parallel on the socket substrate had a smooth surface. As a result, when the mating electric component generates a high temperature or when the electric contactor is used at a high temperature, a heat radiating plate is prepared as a separate component and the heat radiating plate is closely attached to the mating electric component. As a result, the cooling effect by ventilation was improved.

Problems to be Solved by the Invention Since the electric contactor is configured as described above,
When cooling the other party's electric parts and electric contacts by ventilation,
The surface area of the electric contactor is small, and the electric contactor alone cannot provide a sufficient cooling effect, so that a heat sink must be facilitated as a separate component, or when the male terminal portion is soldered to a printed circuit board or the like. In addition, the contact area between the male terminal and the solder is small and the solder strength is weak. Further, when the electric contact is continuously punched from a strip made of a spring contact material,
When the electric contact is deformed against its springiness, the surface of the part where stress concentration occurs is a non-smooth punched surface, so the stress concentration is further advanced and as a result the life of the electric contact is shortened. Had.

Means for Solving the Problems As a means for solving the above problems, the present invention provides a large number of terminals having an electrical contact portion provided on a contact piece having a spring property and a male terminal portion implanted on a socket substrate. Electrical contacts
The socket substrate is arranged in parallel via a partition wall, a gap is formed between the partition wall and the contact piece, and a side surface of each electric contact facing the partition wall through the gap is formed into a fine uneven surface.
The concavo-convex skin facing the gap and the gap that promotes ventilation synergistically enhance the cooling effect by ventilation.

In addition, the uneven surface of the male terminal enhances soldering strength,
Further, the stress when the contact piece of the electric contact is deformed against its springiness is dispersed in the uneven skin to extend the life of the electric contact.

Further, as an example, an uneven skin is formed by etching so as to obtain a desired uniform and fine uneven skin.

In yet another embodiment, electrical contacts are continuously stamped from a strip of spring contact material, at least one surface of which has been textured by etching to cool the gap and the texture of the textured surface facing the gap. It is designed to form a structure.

Function In the present invention, a gap is formed between the contact piece of each electric contactor and the partition wall, and the side surface of the electric contactor facing the partition wall through this gap is provided with an uneven surface.

As a result, the side surface of the electric contactor having a myriad of minute irregularities is arranged facing the gap, and as a result, the cooling effect due to ventilation in the gap is significantly enhanced, and the heat dissipation plate can be saved. It will be possible.

Further, since the surface area of the side surface of the male terminal portion of the electric contact increases, the contact area between the male terminal portion and the solder increases when soldering to a printed circuit board or the like, and the soldering strength increases.

Further, when the electric contactor is continuously punched from a strip made of a spring contact material, the side surface of the portion where the concentration of power occurs when the electric contactor is deformed against its spring property is uneven. Since it is a skin, the stress is dispersed in the uneven skin portion, and as a result, the maximum stress value is lowered and the electrical contact can have a long life.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 to 7.

As shown in FIG. 1, the electric contactor 1 has a contact piece 1d, which has a spring property and is elastically displaceable in the vertical direction, which extends above the horizontal connection piece 1c at one end of the horizontal connection piece 1c and has the other end. A male terminal portion 1b extending downward is provided in the portion, and an upward protrusion is formed on the free end of the contact piece 1d, which is used as an electrical contact portion 1a.

As shown in FIG. 1, the electric contactor 1 pushes a mating contactor 2 such as an IC lead against the electric contact portion 1a to displace the contact piece 1d downward against its elasticity,
The restoring elasticity is used to obtain a contact pressure with the mating contact 2.

Further, as shown in FIGS. 5 and 6, a plurality of the electric contacts 1 are planted in parallel so that the male terminal portions penetrate through two or four sides of the socket substrate 3, and the mating contacts 2
The contact pieces 1d of the electric contacts 1 are adjacent to each other via the insulating partition 3a, and a gap 3b is present between the insulating partition 3a and the contact piece 1d of the electric contact 1. .

The present invention relates to the spring contact type electric contactor 1 as described above, that is, an adjacent surface when the electric contactor 1 is arranged in parallel with a gap 3b between the contact piece 1d and the partition wall 3a, that is, a gap. The side surface 1e on the side opposite to the partition wall 3a via the 3b is a fine uneven skin 1e 'as shown in FIG.

2 and 3 show the side surface 1e and the back surface of the electric contactor 1, and FIG. 7 shows an enlarged cross-section. In particular, as shown in FIGS. 3 and 7, the side surface 1e is shown. On uneven skin 1
The formation of e'results in an increase in the surface area of the electrical contact 1 facing the gap 3b.

The fine textured skin 1e 'may be formed after the electrical contactor 1 is continuously punched from a strip made of a spring contact material, but preferably, as shown in FIGS. 4A to 4C, First, one or two surfaces of the strip 8 made of the spring contact material may be sandblasted or etched by ferric chloride or cupric chloride to form the uneven skin 1E, and then punched continuously by press working. . The uneven skin 1e ′ is desired to have fine projections and depressions and uniform distribution and height. The above sand blast, especially etching can provide a highly dense and uniform uneven skin 1e ′, and the size of the protrusions and depressions can be easily adjusted by selecting the sand blast particles, the concentration of the etching solution, the etching time, and the like. You can choose.

As described above, it is possible to obtain the electric contactor 1 in which the uneven skin 1e ′ is formed on one or both of the side surfaces 1e of the electric contactor 1 facing the partition wall 3a with the gap 3b therebetween, and this is used as a socket. A plurality of side-by-side insulating walls 3a are arranged in parallel on two or four sides of the substrate 3 so that the uneven skin 1e 'faces the partition 3a via a gap 3b and the side surfaces 1e of the electric contacts 1 are adjacent to each other. To do.

The electric contact 1 has a flat IC on the electric contact portion 1a.
The other side contactor 2 such as an IC lead is mounted and connected, and the socket substrate 3
By closing the holding cover 4 to the above, the contact portion is pressed to displace the contact piece 1d downward, and the contact pressure is obtained by the restoring force. The closing of the presser cover 4 by the lock lever 5 is maintained, and the contact state is maintained.

When the contact pressure is obtained by the restoring force of the contact piece 1d according to the above,
1d repeats bending to the punching surface side with the base part as a fulcrum whenever the mating contactor 2 is mounted. As a result, stress is generated in the contact piece 1d. The stress causes the maximum stress at the place where the maximum bending moment occurs, and in this embodiment, the base of the contact piece is the maximum stress portion 1f. Since the stress has the property of being concentrated in the portion where the spring shape changes, the surface of the maximum stressed portion 1f is a punched surface (fracture surface) that is not very smooth when taking the spring shape in this example as an example.
Although the stress was concentrated at one point and the contact piece 1d was broken, when the uneven skin 1e ′ on the side surface 1e of the maximum stress portion 1f was formed as in this example, the stress was concentrated at one point. Without doing so, it results in being dispersed in a large number of fine protrusions and depressions, and it is possible to effectively prevent breakage of the contact piece 1d.

Also, when heat is accumulated in the other side electric component such as a flat type IC, the heat is transmitted to the electric contact 1 and then the gap 3b.
Due to the ventilation inside, the heat is effectively dissipated from the side surface of the electric contactor 1 whose area is increased by the uneven skin 1e 'which faces this.
Further, since the male and female terminal portion 1b of the electric contactor 1 is also formed with the uneven skin 1e ', when the male terminal portion 1b of the electric contactor 1 is soldered to the printed circuit board 6 or the like, the solder 7 and Male terminal part
As the contact area with 1b increases, as shown in FIG. 7, the solder 7 is soldered in such a manner as to bite into the uneven skin 1e ′ of the male terminal portion 1b, so that the printed circuit board 6 and the like are electrically contacted. The soldering strength with the male terminal portion 1b of the child 1 is increased. 9 in FIG.
Is a plating layer that covers the uneven surface 1e ′ (adjacent surface 1e) and the punched surface.

As described above, the uneven surface 1e 'is formed on the side surface 1e of the contact piece 1d of the electric contact 1, and the gap 3b is formed between the side surface of the contact piece on which the uneven surface 1e' is formed and the partition wall 3a. I have Therefore, when the electric parts mounted on the contact part are energized and the temperature rises,
The heat is conducted to the contact piece 1d, and the contact piece 1d also radiates heat. At this time, heat convection is generated from the inside of the gap 3b, heat radiation (cooling) from the uneven skin 1e ′ facing the gap 3b is promoted, and as a result, cooling of the electric component is promoted.

At this time, if there is positive air flow, the cooling effect will be very good, but even if there is no direct air flow, the heat described above will cause uneven surface 1e ′ due to convection in the gap 3b.
Thus, the heat is effectively taken away and distributed to the periphery thereof, and the cooling effect can be remarkably improved by the synergistic effect of the uneven skin 1e ′ facing the gap 3b and the gap 3b that promotes ventilation.

Further, since the surface area of the male terminal portion 1b of the electric contactor 1 is increased by forming the side surface of each electric contactor 1 into a finely textured skin 1e ′, the surface area of the male terminal portion 1b of the electric contactor 1 is also increased. In order to increase the size, the contact area between the male terminal portion 1b and the solder 7 is increased when the electrical contactor 1 is inserted into the through hole or the like of the wiring board or the like by using the male terminal portion 1b and soldered. It is possible to increase the soldering strength by causing the solder 7 to bite into the uneven skin 1e ′.

Furthermore, since the side surface of each electric contact 1 has an uneven skin 1e ′, the stress when the elastic contact piece of the electric contact 1 is elastically deformed is dispersed in the uneven skin 1e ′. As a result, the maximum stress value can be reduced and the electric contact 1 can have a long life.

[Brief description of drawings]

FIG. 1 is a perspective view of an electric contactor showing one embodiment of the present invention,
2 is the same side view, FIG. 3 is the same rear view, FIG. 4A is a side view of a strip made of a spring contact material having a textured surface, and FIG. 4B is a pressed strip. FIG. 4C is a side view of the electric contact punched out from the strip according to FIG. 4B, FIG. 5 is a plan view of a socket in which the electric contact is implanted, and FIG. 6 is the same. FIG. 7 is a cross-sectional view of the socket in which the electric contacts are arranged side by side, and FIG. 7 is an enlarged cross-sectional view illustrating a soldered state of the electric contacts. 1 ... electric contactor, 1a ... electric contact part, 1b ... male terminal part, 1d ... contact piece, 1e ... adjacent surface, 1e '... uneven surface, 1f
...... Maximum stress area, 2 ...... Mating contact, 3 ...... Socket board, 3a ...... Insulating partition, 3b ...... Gap, 6 ...... Printed board, 7 ...... Solder.

Claims (3)

[Claims] 1. A large number of electric contacts having an electric contact portion provided on a contact piece having a spring property and a male terminal portion implanted on a socket substrate, and the electric contacts are arranged in parallel through a partition wall. Then, a gap is formed between the partition wall and the contact piece, and the side surface of each electric contact facing the partition wall through the gap is made into a finely uneven surface, and the electrical contact in a socket is characterized. Child cooling structure. 2. The cooling structure for an electrical contact in a socket according to claim 1, wherein the uneven skin is formed by etching. 3. The electrical contact in a socket according to claim 1, wherein the electrical contact is stamped from a strip of spring contact material having at least one surface textured by etching. Child cooling structure.