JP3436746B2 - Terminal holding member - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a terminal pressing member that presses an IC lead into a socket when performing a functional test of an IC semiconductor device.

[0002]

2. Description of the Related Art When testing the electrical characteristics of an IC using an IC tester, conventionally, as shown in FIG.
The IC package 20 that is the device under test is placed on top of this, and the terminal pressing member 30 is pushed down from above to lead 21
And the contactor 13 of the socket 10 are electrically contacted.

The socket 10 has a contactor base 12 and a contactor 13 stacked on a board for a device under test (hereinafter simply referred to as a DUT board) 11, and the contactor 13 is attached to a lead 21 of an IC package 20.
Are arranged at the same pitch as. The leads 21 are normally attached in four directions around the entire circumference of the package 20, and extend in a direction perpendicular to each side.

A leaf spring type contactor or a pogo pin is usually used as the contactor 13. These contactors have a spring property and are formed so as to come into contact with each lead 21 at a certain contact pressure. The sheet-type socket used for testing has a structure in which a contactor having no spring property is attached to a film-shaped contactor base. In addition, here, such a sheet-type socket is targeted.

The terminal pressing member 30 is a rectangular parallelepiped substrate 31.
It is composed of a leg portion 32 and a lead pressing member 33. The legs 32 are formed in a trapezoidal plate shape, and the four legs 32 are attached to the lower surface of the substrate 31 in a square shape. This leg 3
A plate-shaped lead pressing member 33 made of an elastomer material for pressing the IC leads 21 is attached to the inside of the device 2.

The lower end of the lead pressing member 33 projects from the lower end of the leg portion 32, and the inner surface side of the lead pressing member 33 is a space so as not to come into contact with the package 20 when pressed. The terminal pressing member 30 is pushed down or pushed up by a well-known drive mechanism (not shown).

[0007]

However, the conventional terminal pressing member as described above has the following problems. (1) The lead pressing member is made of an elastomer material and its life is short. (2) The positioning accuracy of the package 20 is poor, and as a result, poor contact between the leads 21 of the IC and the contactor 13 is likely to occur.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and to realize a long-life terminal pressing member which can surely bring the lead into contact with the contactor.

[0009]

In order to achieve such an object, the invention of claim 1 of the present application is a terminal pressing member for contacting a lead of an IC package with a contactor of a DUT board. consists Jo substrate and leg elongation spring structure in a direction perpendicular to the substrate is formed, the legs to act as independent springs to the lead
The both read when separated by the longitudinal grooves are configured to be only mechanical contact, and characterized by being configured so as to be capable of contacting the lead contactors by pressing the lead of the IC package in this leg To do.

According to this structure, the legs act as a plurality of independent springs for the lead, so that the DUT
Even if there is undulation on the board surface, the leads can be pressed against the contactor without fail.

[0011] The spring structure in this case leg Ru can be achieved by providing the lateral groove as claimed in claim 2. Also, the longitudinal groove is formed in each lead one or each plurality as claim 3.

[0012] As this time claims 4, a contact portion of the IC package leads at least the leg or the legs are formed of plastic material. Plastic is superior in spring property and wear resistance to conventional elastomer materials, and can easily realize a terminal pressing member having a long life.

[0013]

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in detail below with reference to the drawings. FIG. 1 is a configuration diagram showing an embodiment of a terminal pressing member according to the present invention. 1, the same parts as those in FIG. 4 are designated by the same reference numerals, and the description of the same parts will be omitted.

The terminal pressing member 40 is composed of a substrate 31 and a leg portion 42 which are integrally formed. The leg portion 42 is formed at a position facing the lead 21 of the IC. The substrate 31 and the leg portion 42 are not limited to be integrally formed, and may have a structure in which they are assembled.

The four legs 42 for pressing the leads on the four sides of the IC package are formed in trapezoidal plate-like outer shapes. Then, a lateral groove 43 extending laterally from the outside to the inside is formed at an appropriate height position from the lower surface thereof,
The leg portion 42 is separated into an upper end portion 44 and a lower end portion 45 to have a U-shape, thereby forming a leaf spring. The leg 4
The shape of 2 is not limited to the trapezoidal plate shape, but may be another shape. Further, a cutout portion 46 is formed in the lower end portion 45 so as not to contact the IC package 20. The lateral groove 43
Does not have to be right beside, but may be slanting beside. The groove width does not have to be constant, and may be a wedge-shaped groove. Furthermore, the lateral groove may be formed from the inside to the outside of the leg portion, contrary to the above embodiment.

FIG. 2 is a bottom view of the terminal pressing member 40.
As is apparent from FIGS. 1 and 2, a vertical groove 47 is formed in the leg portion 42 at a position facing the gap portion of the IC lead 21. Acts as a counter spring. The width of the vertical groove 47 formed in the lower end portion 45 is such that the IC does not move even if it is displaced.
It is preferable that the lead 21 is as narrow as possible so as not to fit into the groove 47.

As the material of the terminal pressing member 40, plastic or the like having good spring property and wear resistance is suitable.
If the substrate 31 and the leg portion 42 are not integrally formed, the above-mentioned plastic may be used only for the leg portion 42.
Also, the entire leg 42 need not be plastic. It suffices that at least the portion of the lower end portion 45 that comes into contact with the lead is made of plastic, and the lead has a structure that makes mechanical contact only. In these cases, a non-conductive material other than plastic may be used instead of plastic.

The vertical groove 47 may be formed at a ratio of one to two leads as shown in FIG. If the lead pitch is narrow, it is about 0.4 mm, and the leg part with vertical groove for each lead may damage the teeth of the spring comb if an external force is applied in the horizontal direction carelessly. .

However, when the vertical groove is formed at a rate of one for every two leads, it is less likely to be damaged by an unexpected external force in the horizontal direction. Further, even when the heights of the two leads are different, the two leads can be appropriately pressed against the contactor due to the torsion of the spring portion. In addition,
The vertical groove may be formed at a ratio of one to three or more leads.

[0020]

As described above, the present invention has the following effects. (1) Even when the surface of the DUT board has a certain amount of undulation, the individual leads are reliably pressed against the contactor. (2) The terminal retainer member made of a plastic material is much more excellent in wear durability than the conventional terminal retainer made of an elastomer material. (3) Since the shape is more stable than the conventional terminal retainer made of an elastomer material, a stable contact can be obtained. (4) The legs do not change over time and provide a uniform pressing force.
It can be secured in the life.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of a terminal pressing member according to the present invention.

FIG. 2 is a bottom view of a terminal pressing member.

FIG. 3 is a configuration diagram showing another embodiment of the present invention.

FIG. 4 is a configuration diagram showing an example of a conventional terminal pressing member.

[Explanation of symbols]

10 socket 11 DUT board 12 contactor base 13 Contactors 20 IC package 21 lead 30, 40 terminal pressing member 31 substrate 42 legs 43 lateral groove 44 upper end 45 Lower end 46 Notch 47 vertical groove

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Bibliographical reference 2-45474 (JP, U) Actual development 5-25377 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) G01R 31/26 H01R 33/76

Claims (4)

(57) [Claims] 1. A terminal holding member for contacting the leads of the IC package to the contactor of the DUT board, the elongation spring structure in a direction perpendicular to the substrate a plate-like substrate formed
Consists by legs, the leg when it is separated by a longitudinal groove to act as an independent spring relative to the lead and both lead is configured to be only mechanical contact, IC package in this leg A terminal pressing member that can bring the lead into contact with the contactor by pressing the lead. 2. A spring structure of the leg, the terminal holding member according to claim 1, characterized in that made Rikatachi by the <br/> providing the lateral groove. 3. The terminal pressing member according to claim 1, wherein the vertical groove of the leg portion is formed for each lead or for each plurality of leads. 4. At least the leg or I in the leg
4. A portion of the C package, which comes into contact with the lead, is made of plastic .
The terminal holding member according to.