JP2530126Y2 - Contact pin for IC socket - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention relates to a contact pin for an IC socket for making an electrical connection between a lead terminal of an IC element and an external circuit, and is particularly suitable for a multi-terminal IC socket in which the pitch between adjacent contact pins is narrow. The present invention relates to an extremely thin contact pin.

[0002]

2. Description of the Related Art Japanese Patent Application Laid-Open No. 61-150249 and the like disclose a method of forming a contact pin having a small thickness among contact pins for an IC socket used for mounting electronic components such as IC elements. Although an annular contact pin as shown is known (FIG. 9), as shown in FIGS. 10 and 11, the IC element mounted on the top 3 of the contact pins I0 arranged in a large number in the socket body 20 is shown in FIG. The lead terminals are pressed by the pads 21-1 and 21-2 fixed to the lid body 21 when the lid body 21 pivotally supported by the socket body 20 via the shaft 23 is closed. It is designed to be pressed against 10 '.

[0003]

In such a conventional contact pin 10 ', however, the lid 21 is closed and the lead terminals are pressed by the pads 21-1 and 21-2 fixed to the lid 21. When the connection between the lead pin and the contact pin 10 'is attempted, an oxide film formed on the surface of the lead terminal and the contact pin 10' becomes an insulating material, and a problem occurs that electrical connection cannot be obtained. .

Further, the contact pin according to the present invention has a drawback that it is extremely weak to large-scale plastic deformation because the contact pin is formed by forming a very round plate material in an annular shape.

In the present invention, in view of such circumstances, an electrical connection can be obtained without insulation due to an oxide film which tends to be formed on the surface of a lead terminal or a contact pin, and an extremely thick plate which is not damaged by plastic deformation. An object of the present invention is to provide a contact pin for a thin IC socket.

[0006]

The contact pin 10 according to the present invention will be described with reference to FIG. 3. When a force F is applied to the mounting portion 3 from above in the direction of the arrow, the operation will be as indicated by the dashed line. However, when the center of this operation is analyzed, the point becomes zero, and this point is located slightly away from the annular shape of the contact pin 10.

Similarly, when comparing other shapes, FIG. 4 shows a single pin-shaped contact pin 10, but the center O of the wiping operation of the contact portion by the force F is within the shape of the contact pin. 5 and 6, the center O of the wiping operation is substantially in the shape of the contact pin as in the case of the single plate, even when a part of the annular arm is cut off as shown in FIGS.

FIG. 8 shows the relationship between the amount of wiping (rubbing) and the amount of distortion on the abscissa and the ordinate, respectively, as shown in a graph. The contact according to the present invention is annular and has two arms. Although the pin 10 has the largest distortion amount, the wiping amount is small. In this case, as shown in FIG. 9, the top 3 must move downward linearly and the wiping amount must not be zero.

Further, in order to prevent breakage due to plastic deformation occurring when an excessive force F is applied to the top 3 of the contact pin 10, a regulating member is provided inside the ring as shown in FIG. Therefore, it is possible to prevent deformation or the like occurring in the neck portion 1.

[0010]

According to the present invention, the distortion of the pressing force caused by the pad when closing the lid is large due to the opposing force vectors acting on the two arms as shown in FIG. Moreover, the wiping of the contact portion can be performed reliably. Further, even if an accident is caused by an excessive force, since the regulating member 100 is disposed inside the annular portion, there is no need to worry about unnecessary distortion.

[0011]

FIG. 1 shows a contact pin 10 according to the present invention. Even when a force F is applied from above as shown in FIG. 2, the two arms disperse the force in an upper position and a lower position. As it fits, even thin contact pins will not twist or fall. In addition, since the center of the wiping (rubbing) operation is slightly separated from the shape, the amount of wiping is small even if the amount of distortion is large, and the wiping amount is optimal for a short-type lead frame, which tends to have more terminals.

Further, as shown in FIG. 7, by disposing a restricting member (a pin or the like) 100 at a position on the left edge from the neck portion 1 inside the annular portion, it is possible to prevent breakage due to plastic deformation.

[0013]

As described above, according to the contact pin of the present invention, wiping with the lead terminal can be surely performed without twisting or falling down even if the thickness is small, and the arrangement of the regulating member enables Damage due to plastic deformation can be prevented.

[Brief description of the drawings]

FIG. 1 is a front view of an embodiment according to the present invention.

FIG. 2 is an explanatory diagram when a force is applied to the contact pin of FIG. 1 of the present invention.

FIG. 3 is an explanatory view of the wiping operation of the contact pin of the present invention.

FIG. 4 is an explanatory diagram of a contact pin wiping operation of an example different from the present invention.

FIG. 5 is an explanatory diagram of another example of a wiping operation of a contact pin different from the present invention.

FIG. 6 is an explanatory view of a wiping operation of a contact pin according to still another example different from the present invention.

FIG. 7 is a front view of an example using the regulating member of the present invention.

FIG. 8 is an explanatory diagram showing characteristic curves of each example of FIG. 1 and FIGS. 4 to 6;

FIG. 9 is a front view of a conventional contact pin.

FIG. 10 is a plan view of a conventional IC socket.

11 is a side view showing a part of FIG. I0 as a cross section.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Neck part 2 Arm part 3 Top part 10 Contact pin 20 Socket main body 21 Lid 21-1 Pad 21-2 Pad 100 Control member

Claims (2)

(57) [Scope of request for utility model registration] 1. A contact pin for an IC socket for making an electrical connection between a lead terminal of an IC element and an external circuit, the contact pin having an annular shape formed by two arms facing each other, and one side being a base. A contact pin for an IC socket, wherein a contact portion of a lead terminal is provided on a line which is fixed in a direction away from a neck of a free end on the other side in a pressing direction. 2. The contact pin for an IC socket according to claim 1, wherein a regulating member for suppressing a significant plastic deformation of said arm is disposed inside the annular shape.