JP2681110B2 - Socket for electrical components - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a socket for an electric component such as an IC, and more particularly, a contact held in the socket body makes a pressure contact with a terminal of the electric component with a downward force. And a socket for electric parts.

The IC socket shown in the prior art USP4715823 or the like is provided with a contact opening / closing member capable of large downward movement on the upper part of the socket body, and when the contact opening / closing member is pushed down, the contact is elastically displaced rearwardly to form an IC terminal. When the contact release state is formed, the IC can be attached / detached with no load in the same state, and further, when the pressing force of the contact opening / closing member is released, the contact is elastically displaced forward to push up the contact opening / closing member.
The pressure contact is made so as to apply a downward force to the bent portion of the terminal.

Problems to be Solved by the Invention In the socket described above, the contact is displaced forward in accordance with elasticity and is elastically pressed laterally against the surface of the IC terminal in a stationary state to obtain a contact pressure. Reliability depends only on the contact pressure due to the elasticity of this contact.

However, the density of IC terminals has been increasing in recent years, and with this trend, contacts are becoming more and more miniaturized. Inevitably, if the contacts are miniaturized, the elastic coefficient becomes smaller and the elasticity acting on the IC terminals becomes smaller. As a result, the contact pressure is weakened and the contact pressure is lowered. Therefore, it is difficult to secure a highly reliable contact only by the elasticity of the contact.

Further, it is desired that the contact opening / closing member can be operated with as small a pressing force as possible. However, in the conventional example, reducing the pressing operation force is irrational to reduce the elasticity of each contact and reduce the contact pressure. Leads to results,
There is a drawback that it is difficult to reduce the pressing operation force of the contact opening / closing member while securing the contact pressure (elasticity of the contact).

INDUSTRIAL APPLICABILITY The present invention enables contact miniaturization while ensuring contact reliability. Therefore, even if the contact is miniaturized (reducing elasticity) to reduce the pressing operation force of the contact opening / closing member, the contact reliability can be reduced. It is intended to provide a socket for electric parts in which the property is not impaired.

Means for Solving the Problems As means for solving the problems, the present invention includes a push-up spring that applies an upward force to the electric component and a push-down contact that applies a downward force to the electric component terminal and pressurizes the electric component terminal. The downward force of the contact is set to be larger than the upward force of the push-up spring, and when the push-down contact comes into pressure contact with the electrical component terminal, the downward force compresses the push-up spring to secure the electrical component terminal. The socket for an electric component is configured to be pushed down to cause sliding along the surface of the terminal of the electric component.

Operation According to the present invention configured as described above, the push-down contact comes into contact with the surface of the electric component terminal with a predetermined contact pressure, and at the same time, the push-down contact compresses the push-up spring by its downward force. While pushing down the electrical component terminals,
Along with the pressing, the pressing contact slides along the surface of the electric component terminal, whereby the oxide film on the contact surface is removed and healthy electrical contact can be expected on the active metal surface.

Therefore, reliable contact can be secured even with relatively weak contact pressure,
As a result, the contacts can be miniaturized to effectively deal with the high density of the terminals of electrical parts, and further, the contacts can be miniaturized (reducing the elasticity) to reduce the force of pushing down the contact opening / closing member. The degree of freedom of is significantly increased.

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

Reference numeral 1 denotes a socket main body made of an insulating material having a rectangular outer shape, and an electric component housing portion 2 is provided on an upper surface of the socket main body 1.
The contacts 5 are arranged on two opposite sides or four sides of the housing portion 2 facing each other so as to make a pressure contact with the terminals 4 of the electric component 3 so as to apply a downward force.

The terminal 4 of the electric component 3 is projected from the side surface of the electric component, is bent in a J shape along the same side surface, and has a bent portion 4a at the protruding base portion. The push-down contact 5 is brought into pressure contact with the bent portion 4a to apply the vertical force.

The push-down contact 5 has a male terminal 6 projecting from the lower surface of the socket body 1, a spring portion 7 extending upward from a base portion of the male terminal 6, and a rear portion from an upper end portion of the spring portion 7. The cantilever arm 8 is extended, and the pressure receiving portion 9 is erected upward at the end of the cantilever arm 8 so that the spring portion 7 and the cantilever arm 8 are provided.
A contact portion 10 is provided on the continuous portion of the contact portion 10 so as to pressurize the terminal 4 of the electric component 3 housed in the housing portion 2 and apply a downward force.
The contact portion 10 is arranged facing the accommodation portion 2.

On the other hand, a vertically movable contact opening / closing member 11 is mounted on the socket body 1. The contact opening / closing member 11 has an electric component loading window 12 that faces the electrical component housing 2, and a cam that faces the tip of the pressure receiving portion 9 of the pressing contact 5 in a frame portion that defines the loading window 12. The cam portion is provided with the portion 13.
13 is placed on the pressure receiving portion 9 to support the entire contact opening / closing member 11. As shown in the figure, the cam portion 13 has a gentle slope in the front stage and a steep slope in the rear stage, and when the pushing contact 5 has a small elastic force during the initial displacement, a large amount of displacement is secured by the gentle slope in the preceding stage, and the elastic force of the contact 5 increases. At the time of displacement, the final displacement amount is obtained with the force reduced by the steep slope in the latter stage.

A mounting table 15 for supporting the electric component 3 is provided at the center of the inner bottom of the electric component housing 2 so as to be movable up and down, and the mounting base 15 is fitted into a guide 16 which is recessed in the bottom wall of the housing. The lower surface of the mounting table 15 is supported by a push-up spring 17 which applies an upward force to the electric component 3 so as to guide the vertical movement. The electric component 3 accommodated in the accommodating portion 2 is supported by the table 15 and descends together with the mounting table 15 while compressing the push-up spring 17 and also the spring 17.
It can be increased by the resilience of. Figures 3 and 4 show platform 15
Although the electric component 3 is indirectly supported via the via to give an upward force, as another example, the mounting base 15 is not provided as shown in FIG. Can hold bullets. As a suitable example of the push-up spring 17, the illustrated coil spring is used.

As described above, the contact 5 forms a means for pushing down the electric component terminal 4 and the electric component 3, and the spring 17 forms a dynamic pushing means, and the both 5, 17 are opposite to each other with respect to the electric component 3 and its terminal 4. It gives a downward force and an upward force in the direction. The downward force by the push-down contact 5 is set large, and the upward force by the push-up spring 17 is set small.

Thus, as shown in FIGS. 1A, 3A, and 4A, the contact opening / closing member 11 includes the pressure receiving portion 9 of the push-down contact 5.
When the contact opening / closing member 11 is pushed down manually or by robot operation from the upper supporting state, the cam portion 13 pushes down the pressure receiving portion 9 of the pushing down contact 5 and descends to the spring portion 7. To bend the pressure contact portion 10 rearwardly to the contact release position, and thus the accommodating portion 2
Is opened (see FIGS. 1B, 3B and 4B).
In this state, the electric component 3 represented by the IC is loaded into the housing portion 2 with a load and supported by the mounting table 15 in the housing portion 2.

Thus, when the pressing force of the contact opening / closing member 11 is released after loading the electrical component 3, the spring portion 7 is restored, and the pressure receiving portion 9 pushes up the contact opening / closing member 11 while the pressure contact portion 10 is displaced forward. electrical part terminals shape bending surface pressure contact from lateral 4a of 4 (position see Fig. 1 B and Fig. 2 a _1). After the pressure contact, the spring portion 7 continues to elastically restore, and the contact portion 10 accordingly applies a downward force larger than the upward force by the push-up spring 17 to the terminal 4 and the electric component 3. As a result, the push-down contact 5 compresses the push-up spring 17 and moves the electric component 3 and the terminal 4 from the position a ₁ shown in FIG.
While pushing down to the position of a ₂ , the contact portion 10 of the pushing down contact 5 keeps the pressure contact with the terminal 4 in FIG.
Sliding from the position of b _{1 to} the position of b ₂ , that is, the curved portion of the terminal 4.
Sliding from the corner of 4a to the upper surface, the oxide film is removed by friction between the contact parts to expose the active metal surface and make a sound contact (Figs. 1C, 3C, 4C). reference). Further, the contact portion 10 is engaged with the upper surface of the curved portion 4a of the terminal 4 to hold the electric component 3 in the housing portion 2 and hold the contact.

As described above, the present invention provides a very simple means for setting the downward force of the contact to be larger than the upward force of the spring by forming the pushing-down means by the contact and the pushing-up means by the spring. By taking such a measure, it is possible to cause a rubbing of the pressure contact portion while bringing the contact into pressure contact with the electric component terminal, thereby exposing an active metal surface on the contact surface to ensure sound electrical contact. Can be expected. Therefore, highly reliable contact can be ensured even with a relatively weak contact pressure, and even if the contact is miniaturized, the contact reliability can be maintained, so that it is possible to effectively cope with the high density of the electrical component terminals.

Further, by making the contact fine and reducing the elasticity, it is possible to reduce the pressing operation force of the contact opening / closing member.

[Brief description of the drawings]

The drawings show an embodiment of the present invention, and FIGS. 1A, 1B, and 1C are front views illustrating the operation process of a push-down contact and a push-up spring for an electric component terminal, and FIG. 1A is a contact for the electric component terminal. Before the contact, FIG. B shows the initial state of the contact, and FIG. C shows the completed state of the contact. FIG. 2 shows the sliding of the push-down contact and the electrical component terminal accompanying the push-down of the electrical component terminal. FIG. 3A is an enlarged cross-sectional view showing the locus of movement, FIG. 3A is a lateral cross-sectional view of a socket showing a state before loading of electric components, FIG. 4A is a vertical cross-sectional view thereof, and FIG. Fig. 4B is a transverse sectional view of the socket, Fig. 4B is a longitudinal sectional view of the same, and Fig. 3C is a transverse sectional view of the socket showing a state in which the contact comes into contact with the electrical component terminal and then slides to complete contact. Is a longitudinal sectional view of the same, and FIG. 5 is a plan view of the socket body. 1 ... socket body, 3 ... electric components, 4 ... terminals,
5 ... Pressing contact, 7 ... Spring part, 8 ... Cantilever arm, 9 ... Pressure receiving part, 10 ... Contact part, 11 ... Contact opening / closing member, 13 ... Cam part, 15 ... Platform , 17 …… Push-up spring.

Claims (1)

(57) [Claims] 1. A push-up spring that applies an upward force to an electric component, and a push-down contact that applies a downward force to a terminal of an electric component and pressurizes the electric component terminal. When the downward force of the contact is set to a large value and the contact of the push-down contact to the electrical component terminal is pressed,
A socket for an electric component, characterized in that the electric component terminal is pushed down while compressing the push-up spring so that the push-down contact slides along the surface of the electric component terminal.