JP2001004660A - Contactor and test board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a contactor and a test board capable of retaining the contactor onto a wiring board firmly while reducing the inductance generated at the connection to an object to be measured. SOLUTION: A contactor 11 is provided with a cup 13 having a roughly cylindrical supporting hole 13a in it, and a contact 12 stored in the supporting hole 13a so as to protrude/retreat and energized in the protruding direction. This contactor 11 involves the external surface of the cup 13 having a tapered surface gradually tapering in the opposite direction to the protruding direction as the whole, and the tapered surface is formed with an external thread 13b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a contactor and a test board, and more particularly, to a contactor having contacts urged in a protruding direction, and a test board provided with the contactor.

[0002]

2. Description of the Related Art Prior to shipment, a semiconductor integrated circuit (hereinafter, referred to as a semiconductor integrated circuit)
When performing a test on a measurement target IC), a contactor is used to obtain electrical contact between the measurement target IC and the test board.

A test board using a conventional contactor is described in Japanese Patent Application Laid-Open No. 01-109670. FIG. 4 is a cross-sectional view showing the contactor described in this publication, (a) is a free state of the contactor, (b) is a contact state of the contactor,
(c) shows the main part of the test board on which the contactor is mounted, respectively.

As shown in FIGS. 4A and 4B, the contactor 5
Reference numeral 0 has a cylindrical outer cylinder 51, and a contact 52 is slidably accommodated inside the outer cylinder 51. The contact 52 has a tip 5
The rear end 2b and the rear end 52b are formed substantially equal to the inner diameter of the outer cylinder 51, and the rear end 52b is urged outward by the compression spring 53. The outer cylinder 51 has a front end 51b formed in a funnel shape, and a projection 51a protruding inward at an intermediate portion.
Having. When the rear end 52b of the contact 52 engages with the projection 51a, the contact 52 is prevented from falling off from the outer cylinder 51.

[0005] As shown in FIG. 4 (c), a test board for testing the IC to be measured connected to the connector 57 is
The wiring board 54 has a plurality of cylindrical through holes 54a. A cylindrical socket 55 made of a metal material is fitted into each through hole 54a.
5 is fitted with a contactor 50. In the connector 57,
Leads 56 that are electrically connected to the connected IC to be measured are arranged at the same pitch as the contactors 50 of the test board.

When a test is performed by pressing the lead 56 against the test board 54, the tip 52 a is pushed into the outer cylinder 51 at the tip of the lead 56, and the required distance between the contact 52 and the lead 56 is required. Is obtained. This allows
The spring contactor 50 includes a tip 52a and an outer cylinder 51.
, Electrical continuity between the IC to be measured and the measuring device is obtained.

In general, when the frequency at which the characteristic of the IC to be measured is measured is high, it is measured that there is a portion where an inductance is not formed at the connection between the IC to be measured and the measuring device and impedance is not obtained. Properties are shown to be worse than actual properties. At this time, the deviation between the measured characteristic and the actual characteristic is larger as the inductance is larger, and the inductance of the single wire is proportional to the length of the connection portion.

In the test board described in the above-mentioned publication, the contactor 50 is embedded in the wiring board 54 while the outer cylinder 5
1 is electrically connected to the wiring of the wiring board 54,
The distance from the outer cylinder 51 to the wiring of the wiring board 54 is shortened, and the inductance formed at the connection part is reduced.

[0009]

However, in the test board described in the above publication, the cylindrical contactor 50 is simply inserted into the cylindrical socket 55, and the socket 55 is simply inserted into the cylindrical through hole 54a. Since the contactor 50 is held by the wiring board 54, if the pressing force from the lead 56 is excessively large, the contactor 50 may fall off from the through hole 54a.

[0010] In view of the above, it is an object of the present invention to provide a contactor and a test board capable of firmly holding a contactor on a wiring board while reducing inductance generated by connection with an object to be measured.

[0011]

In order to achieve the above object, a contactor according to the present invention comprises a contactor body having a substantially cylindrical support hole therein, and a contactor body which is accommodated in the support hole so as to be able to protrude / retract freely. And a contactor urged in a direction, wherein an outer surface of the contactor body forms a tapered surface that gradually becomes narrower in a direction opposite to the projecting direction as a whole. A male screw is formed.

In the contactor of the present invention, since the outer surface of the contactor body forms a tapered surface, for example, when the inner surface of a through hole provided in a wiring board forms a tapered surface, the contactor body is fitted into this through hole. Thus, the force when the contact is pushed can be firmly supported by the engagement between the inner surface of the through hole and the outer surface of the contactor body.
For this reason, even when the pressing force applied to the contact at the time of measurement is excessively large, the contactor main body does not fall off the wiring board. Further, for example, if a female screw having a tapered shape as a whole is formed on the through hole side, by connecting a male screw to the female screw, the contactor can be firmly fixed to the through hole side. At this time, since the contacts in the support holes are electrically connected to the wiring of the wiring board in a state of being embedded in the wiring board, the distance from the contactor body to the wiring of the wiring board is shortened, and the inductance formed in the connection portion is reduced. Is reduced.

[0013] The test board of the present invention is a test board in which the contactor is fitted and supported in a through hole provided in a wiring board, wherein the inner surface of the through hole is entirely fitted with the contactor of the contactor. Is characterized in that it has another tapered surface that gradually becomes thinner in the direction opposite to the direction in which it projects.

In the test board of the present invention, since the outer surface of the contactor body forms a tapered surface, when the inner surface of the through hole provided on the wiring board forms a tapered surface, the contactor body is fitted into this through hole. The force when the contact is pushed in can be firmly supported by the engagement between the inner surface of the through hole and the outer surface of the contactor body. For this reason,
Even when the pressing force applied to the contact at the time of measurement is excessively large, the contactor body does not fall off the wiring board.
At this time, since the contacts in the support holes are electrically connected to the wiring of the wiring board in a state of being embedded in the wiring board, the distance from the contactor body to the wiring of the wiring board is shortened, and the inductance formed in the connection portion is reduced. Is reduced.

Here, in a preferable test board of the present invention, it is preferable that a female screw matching the male screw is formed on the another tapered surface. In this case, since the contactor can be directly fixed to the through hole by screwing the male screw into the female screw, the fixing structure is simplified.

Alternatively, instead of the above, between the contactor main body and the through hole, a socket having an inner surface having a female screw matching the male screw and an outer surface having a shape matching the tapered surface of the through hole. Is also a preferred embodiment. In this case, by screwing the male screw into the female screw of the socket, the contactor can be firmly fixed to the through-hole side, and the contactor body can be easily attached to and detached from the wiring board.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail based on embodiments of the present invention with reference to the drawings. FIG.
FIG. 1 is a front view showing a configuration of a contactor according to an embodiment of the present invention. The contactor 11 has a contact 12 whose outer diameter gradually decreases upward and a cup 13 having a cylindrical support hole 13a at the center.

The contact hole 13a of the cup 13 has a contact 1
2 are fitted so as to be able to protrude / retract freely while being urged outward by the compression spring 14. The outer surface of the cup 13 has a tapered surface that gradually becomes thinner (outer diameter becomes smaller) in a direction opposite to the direction in which the contact 12 protrudes, and the spiral external thread 13 is formed on the tapered surface.
b is formed.

At the opening of the support hole 13a, a regulating portion (not shown) for regulating the contact 12 from falling off is formed. The contact 12, the cup 13, and the compression spring 14 are all made of a highly conductive metal material.
It is electrically connected to the cup 13 by sliding contact with the inner surface of the support hole 13a and contact with the compression spring 14.

FIGS. 2A and 2B are cross-sectional views showing a part of a test board supporting the contactor of the present embodiment. FIG. 2A shows a free state of the contact, and FIG. 2B shows a pressed state of the contact. .

The test board 10 has a multilayer wiring board 17 having a plurality of through-holes 17a.
The first contact 12 has a tapered surface that gradually becomes thinner (the inner diameter becomes smaller) in the direction opposite to the direction in which the contactor 12 protrudes.

A socket 18 having a tapered surface whose outer surface gradually narrows in a direction opposite to the direction in which the contact 12 protrudes is fitted into the through hole 17a. Socket 18
The inner surface also has a tapered surface that gradually narrows in the same direction as the outer surface.
A spiral female screw 18a is formed to be screw-coupled to b. The male screw 13b and the female screw 18a are provided with a conductive plating for further increasing the conductivity between them. For example, the power supply pattern 24 in the wiring board 17 is exposed in the through hole 17a and is electrically coupled to the socket 18 fitted in the through hole 17a.

Next, a test using the test board 10 of this embodiment will be described. FIG. 3 is a diagram schematically showing the connection state of the IC to be measured, the test board, and the tester during this test.

First, prior to the test, the test board 10
To a tester (measuring device) 19. In this case, the IN / OUT (hereinafter referred to as I / O) pin 20 of the tester 19 is used as the I / O pattern 23 of the test board 10, the power supply pin 21 is used as the power supply pattern 24, and the GND pin 22 is used as the GND pattern 2.
5 are connected to each other, and a tester 19 is conducted to each socket 18.

When the measurement is started, the connector 15 to which the IC to be measured is connected is pressed against the test board 10, and each lead 16 that conducts to the IC to be measured is connected to the tip of the contact 12 of the corresponding contactor 11. Press. As a result, the contact 12 is pushed into the inside of the cup 13 against the compression spring 14 and a required contact pressure is obtained, so that electrical contact between the contactor 11 and the lead 16 is ensured.

At this time, since the outer surface of the socket 18 has a tapered surface as a whole, even if an excessively large downward force acts through the contact 12, the corresponding tapered through hole is formed. It is firmly held without falling down from the hole 17a. The contactor 11 is firmly held with respect to the socket 18 because the male screw 13b formed on the tapered surface is screwed to the female screw 18a similarly formed on the tapered surface. Therefore, even when the pressing force applied to the contact 12 during measurement is large, the cup 13 is
Never drop out of 7.

In the contactor 11, the contact 12 in the cup 13 is electrically connected to the wiring of the wiring board 17 through the socket 18 while being embedded in the wiring board 17.
The distance from 3 to the wiring of the wiring board 17 is reduced, and the inductance formed at the connection portion is reduced.

In the present embodiment, the contactor 11 is fitted and supported in the through hole 17a via the socket 18. However, the present invention is not limited to this, and an overall tapered female screw corresponding to the female screw 18a is formed in the through hole 17a. Formed on the inner surface, this female screw is
By directly screwing b, the contactor 11 can be fitted and supported in the through hole 17a. In this case, conductive plating is applied to the through hole 17a,
For example, if the power supply pattern 24 is connected to the conductive plating, the conductivity between the cup 13 directly screwed into the through hole 17a and the power supply pattern 24 can be increased. With such a configuration, the same effect as in the above embodiment can be obtained.

Although the present invention has been described based on the preferred embodiment, the contactor and the test board of the present invention are not limited to only the configuration of the above-described embodiment, and are not limited thereto. Contactors and test boards with various modifications and changes from the configuration are also included in the scope of the present invention.

[0030]

As described above, according to the contactor and the test board of the present invention, the contactor can be firmly held on the wiring board while reducing the inductance generated by the connection with the object to be measured.

[Brief description of the drawings]

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

FIGS. 2A and 2B are cross-sectional views each showing a part of a test board according to an embodiment of the present invention. FIG. 2A shows a free state of a contact, and FIG. 2B shows a pressed state of the contact.

FIG. 3 is a diagram schematically illustrating a connection state of an IC to be measured, a test board, and a tester during a test using the test board of the embodiment.

FIG. 4 shows a conventional contactor, (a) is a cross-sectional view showing a free state of the contactor, (b) is a cross-sectional view showing a contact state of the contactor, and (c) is a main part of a test board on which the contactor is mounted. It is sectional drawing which expands and shows.

[Explanation of symbols]

 10: Test board 11: Contactor 12: Contact 13: Cup (contactor body) 13a: Support hole 13b: Male screw 14: Compression spring 15: Connector 16: Lead 17: Wiring board 17a: Through hole 18: Socket 18a: Female screw 19: Tester 20: IN / OUT pin 21: Power supply pin 22: GND pin 23: I / O pattern 24: Power supply pattern 25: GND pattern

Claims (4)

[Claims] 1. A contactor comprising: a contactor main body having a substantially cylindrical support hole therein; and a contactor accommodated in the support hole so as to be able to protrude / retract and urged in a protruding direction. The outer surface of the contactor body forms a tapered surface that gradually becomes thinner as a whole in a direction opposite to the protruding direction,
A contactor, wherein a male screw is formed on the tapered surface. 2. A contact board of the contactor, wherein the contactor according to claim 1 is fitted and supported in a through-hole provided in a wiring board, and an inner surface of the through-hole is fitted as a whole. A test board characterized by having another tapered surface that gradually becomes thinner in a direction opposite to the direction of protrusion of the test board. 3. The test board according to claim 2, wherein a female screw matching the male screw is formed on the another tapered surface. 4. A socket is provided between the contactor body and the through hole, the socket having an inner surface having a female screw that matches the male screw and an outer surface having a shape matching the tapered surface of the through hole. The test board according to claim 2.