JP2002174643A - Conductive contact - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a conductive contact having improved durability by preventing a carbonization damage of a holder caused by a spark generated from a defective circuit portion during inspection. SOLUTION: A conductive needle-like body 4 abutting on an inspection object A is received able to appear and disappear in a supporting hole 7 provided in a holder 6 made of an insulating resin material. The surface of the holder 6 opposed to the inspection object A is composed of a lamination of an insulating inorganic plate 15 in which through-holes 13a and 14a are provided for slidably penetrating a tip of the conductive needle-like body 4, so that the insulating inorganic plate 15 can cut off a spark C during inspection.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention transmits an electric signal extracted by bringing a protruding end of a needle-shaped body into contact with a test object (a liquid crystal display substrate, a TAB, or a package substrate (PKG), etc.) to an external circuit. The present invention relates to a conductive contact having a signal transmission line for performing the operation.

[0002]

2. Description of the Related Art Conventionally, a conductive needle used for a contact probe for performing an electrical inspection of a conductive pattern or an electronic element of a printed wiring board includes a conductive needle-like body,
A holder for supporting the needle-like body so that the needle-like body can be protruded and retracted in the axial direction. In some cases, the protruding end of the needle-like body is resiliently brought into contact with the inspection object.

As such, a conductive contact 100 as shown in FIG. 2 is known. The conductive contact 100 has a needle-shaped body assembly 5 in which a pair of conductive needle-shaped bodies 3 and 4 are connected to both ends of a coil spring 2 in a support hole 7 provided in a holder 6 made of an insulating resin material. The whole structure is formed by allowing the pair of conductive needles 3 and 4 to reciprocate and being received, and by attaching the pair of conductive needles 3 and 4 to the outside so as to be prevented from coming off. ing.

At this time, the holder 6 is provided with an intermediate resin insulator 8.
And an upper resin insulator 9 and a lower resin insulator 10 that are vertically stacked so as to sandwich the intermediate resin insulator 8 therebetween. The pair of conductive needles 3 and 4 are , Having a stepped body portion having a different diameter. The pair of conductive needles 3 and 4 are inserted into the support hole 7 in a state where the respective steps are stopped by the upper resin insulator 9 and the lower resin insulator 10 so as to prevent the steps from coming off. Accepted.

According to the conductive contact 100, the protruding end of the upper conductive needle 3 is elastically contacted with the electrode 12 fixed to the wiring plate 11 laminated on the holder 6 to be electrically connected. In this state, the protruding end of the lower conductive needle-shaped body 4 is elastically brought into contact with the inspection target A for use. Thus, it is possible to inspect the circuit formed on the inspection object A for short-circuit or disconnection.

[0006]

In the case of the conductive contact 100, if a defective circuit b having an abnormally high resistance value is formed in the circuit B to be inspected A, the circuit B is not tested during the inspection. The spark C is generated from the defective circuit b, and the surface 10a of the lower resin insulator 10, which is the facing surface of the inspection object A, is carbonized and damaged due to the spark, thereby lowering the durability. Has issues.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a conductive contact having improved durability by preventing carbonization damage of a holder caused by a spark generated from a defective circuit portion during inspection.

[0008]

In order to achieve the above object, according to the first aspect of the present invention, a conductive needle contacting an object to be inspected is protruded and retracted into a support hole provided in a holder made of an insulating resin material. In the conductive contact that is received as possible, the holder is formed by laminating an insulating inorganic plate having a through-hole that slidably penetrates the tip of the conductive needle-shaped body on the surface to be inspected. It is characterized by being constituted.

Therefore, according to the first aspect of the present invention, the spark at the time of inspection can be blocked by the insulating inorganic plate to prevent the holder from reaching the insulating resin material forming portion.

[0010] The invention according to claim 2 is the conductive contact according to claim 1, wherein the insulating inorganic plate comprises:
It is characterized in that it is constituted by laminating an inorganic plate main body and a resin plate as an inspection object facing surface.

Therefore, according to the second aspect of the present invention, the possibility of cracking when the inorganic plate main body is thinned can be reinforced by the resin plate, so that the inorganic plate main body can be thinned accordingly. Further, by making the inorganic plate main body thin, processing such as drilling becomes easy.

According to a third aspect of the present invention, there is provided the conductive contact according to the second aspect, wherein the inorganic plate main body is a ceramic plate.

According to the third aspect of the present invention, the high rigidity of the ceramic plate prevents the insulative inorganic plate from warping along the direction of the spring load applied to the conductive acicular body. Body holding and operation are stabilized.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. The same members and members having the same functions as those shown in FIG. 2 are denoted by the same reference numerals.

FIG. 1 shows a conductive contact 1 in a contact probe to which the present invention is applied. The contact probe to which the present invention is applied is configured by arranging a plurality of conductive contacts 1 vertically and horizontally in parallel at a predetermined pitch.

The conductive contact 1 has a needle-like assembly 5 in which a pair of conductive needles 3 and 4 are connected to both ends of a coil spring 2 and a support hole 7 provided in a holder 6 made of an insulator.
And a pair of conductive needles 3 and 4 are reciprocally received and received, and one end of the conductive needles 4 protrudes outward and is secured so as not to come off, and The conductive needle-shaped body 3 at the other end is electrically connected to and attached to an electrode 12 fixed to a wiring plate 11 laminated on the holder 6.

The needle-shaped body assembly 5 is inserted into and removed from the support hole 7 through an opening 9a on the lamination side of the wiring plate 11 of the support hole 7.

At this time, the holder 6 holds the wiring plate 11
An insulating inorganic plate 15 having a through-hole for slidably penetrating the distal end of the conductive needle-like body 4 is laminated on the opposite surface of the inspection object A on the opposite side of the above.

In this embodiment, the insulating inorganic plate 15
Is formed by laminating a ceramic plate (inorganic plate main body) 14 as a surface facing the inspection object A and a resin plate 13. The ceramic plate 14 and the resin plate 13 are integrated via an adhesive to form the insulating inorganic plate 1.
5.

More specifically, the holder 6 includes two intermediate resin insulators 8a and 8b,
a and 8b are sandwiched between the upper resin insulator 9 and the insulating inorganic plate 15, and the support hole 7 is formed of each of the insulators 8a, 8b, 9, 1
The through holes formed in the thickness direction with the centers of the holes 5 being aligned with each other communicate with each other. That is, the support hole 7 is formed of the opening 9a of the upper resin insulator 9, the through holes of the intermediate resin insulators 8a and 8b having the same diameter as the opening 9a, and the insulating inorganic plate 15 having a smaller diameter than the opening 9a. And a through hole. Insulating inorganic plate 15
Are formed through a through hole 13a of the resin plate 13 and a through hole 14a of the ceramic plate 14 having the same diameter as the through hole 13a.
Are connected to each other.

The intermediate resin insulators 8a and 8b, the upper resin insulator 9 and the insulating inorganic plate 15 are provided with other fastening holes. That is, screw holes 18 are provided in the intermediate resin insulators 8a and 8b as the fastening holes.
However, screw holes 9b are formed in the upper resin insulator 9, and screw insertion holes 13b and 14b are formed in the insulating inorganic plate 15. The screw insertion holes 13b and 14b are
It is formed in the resin plate 13 and the ceramic plate 14, respectively. The screw insertion hole 13b has the same diameter as the screw insertion hole 18 and has a smaller diameter than the screw insertion hole 14b.

The holder 6 includes a fastening screw 16
The screw portion 16b is inserted first from the screw insertion hole 14b, the screw insertion holes 13b and 18 are inserted into the screw hole 9b, and the tip end of the screw portion 16b is screwed into the screw hole 9b. And a laminated structure composed of the intermediate resin insulators 8a and 8b, the upper resin insulator 9 and the insulating inorganic plate 15 is fixed. At this time, the fastening screw 16 is designed such that its head 16a fits into the screw insertion hole 14b and the tip of the screw portion 16b does not protrude outside the screw hole 9b.

The conductive needles 3 and 4 have openings 9a.
And body portions 3a, 4a formed to have a diameter such that they can move while being guided in through holes of intermediate resin insulators 8a, 8b.
Coupling boss portions 3b, 4b projecting from the body portions 3a, 4a with a diameter capable of winding the coil end of the coil spring 2;
The coupling bosses 3b and 4b are composed of needle portions 3c and 4c protruding from the body portions 3a and 4a so as to protrude on opposite sides. Of the needle portions 3c, 4c, the needle portion 4c is formed to have a small diameter such that it can move while being guided by the through hole of the insulating inorganic plate 15.

The needle-shaped body assembly 5 is formed by press-fitting the connecting bosses 3b, 4b into both ends of the coil spring 2 to thereby connect the conductive needle-shaped bodies 3, 4 respectively. I have. The connection of the conductive needles 3 and 4 can be performed by brazing, soldering, or using an adhesive.

The needle-shaped body assembly 5 is provided with a support hole 7
By inserting the needle 4c of the conductive needle 4 into the support hole 7 from the opening 9a side, the end surface of the body 4a is abutted against the inner surface of the insulating inorganic plate 15 to be prevented from falling off. At the same time, the needle portion 4c is received in the support hole 7 with the needle portion 4c protruding outside the insulating inorganic plate 15 through the through holes 13a and 14a. In this receiving state, since the wiring plate 11 is not laminated, the conductive needle-shaped body 3 coupled to the other end of the coil spring 2 is not shown, but is not retained. It protrudes outward from the opening 9a of the support hole 7 by the free length.

Thus, the conductive needle-shaped body 3 projecting outward is returned into the support hole 7 by laminating the wiring plate 11 on the upper surface of the upper resin insulator 9 (see FIG. 1). ), The needle portion 3c resiliently contacts the electrode 12, and the electrical connection with the wiring plate 11 is achieved. The wiring plate 11
It is stacked and fixed on the upper surface of the upper resin insulator 9 by fixing means not shown.

The conductive contact 1 thus configured is
The needle portion 4c of the conductive needle-shaped body 4 is resiliently brought into contact with the circuit B of the inspection object A, and the presence or absence of short circuit or disconnection of the circuit B can be inspected.

When a defective circuit b having an abnormally high resistance value is formed in the circuit B of the inspection object A, a spark C is generated from the defective circuit b during the inspection. The defective circuit b of the present embodiment is formed by short-circuiting the circuits B1 and B2 which should be formed independently.

According to the conductive contact 1, the spark C at the time of inspection can be blocked by the ceramic plate 14 to prevent the holder C from reaching other portions of the holder 6 where the insulating resin material is formed. Carbonization damage caused by C can be effectively prevented, and durability can be improved.

Further, the insulating inorganic plate 15 does not warp along the spring load direction of the coil spring 2 constituting the needle-shaped body assembly 5 due to the high rigidity of the ceramic plate 14, so that the needle-shaped body assembly 5 And the operation thereof are stabilized, and the inspection accuracy can be improved.

Further, the insulating inorganic plate 15 can reinforce the susceptibility of the ceramic plate 14 to cracking when the ceramic plate 14 is thinned by the resin plate 13, so that the ceramic plate 14 can be thinned accordingly. Through hole 1
Hole processing such as 4a and the screw insertion hole 14b becomes easy. For example, the insulating inorganic plate 15 can be formed by integrating a ceramic plate 14 having a thickness of 0.4 mm and a resin plate 13 having a thickness of 0.6 mm.
It has a higher strength than the resin plate 13 of FIG.

Further, since the insulating inorganic plate 15 is formed by integrating the ceramic plate 14 and the resin plate 13 using an adhesive, a counterbore for screws for integration is unnecessary, and the ceramic plate 14 and the resin All of the through holes 14a and 13a and the screw insertion holes 14b and 13b formed in the plate 13 may be formed by straight holes, and in this respect, the ease of processing can be ensured.

The ceramic plate 14 and the resin plate 1
3 can be performed before or after drilling, and the resin plate 1 can be replaced with the above-described bonding means.
3 can be pressed into a hole formed in the ceramic plate 14.

Further, in the present embodiment, by removing the wiring plate 11 laminated on the holder 6,
The opening 9a of the support hole 7 can be opened, and through this opening 9a, the needle-like body assembly 5 provided with the defective conductive needle-like body can be pulled out and emptied. The needle assembly 5 can be replaced by inserting the new needle assembly 5 into the support hole 7 and laminating the wiring plate 11 on the holder 6. Since this replacement operation does not involve disassembly and reassembly of the holder 6 itself, it can be easily performed without requiring a high level of skill.

Further, in the present embodiment, the inorganic plate body as a component of the insulating inorganic plate 15 is constituted by the ceramic plate 14, but the present invention is not limited to this. A ceramic plate or a glass plate can also be used.

[0036]

As described above, according to the first aspect of the present invention, the spark at the time of inspection is cut off by the insulating inorganic plate, so that the spark is effectively prevented from reaching the insulating resin material forming portion of the holder. Thus, the carbonization damage caused by the spark can be eliminated, and the durability can be improved.

According to the second aspect of the present invention, the resin plate is used to reinforce the fragility of the inorganic plate main body when the inorganic plate main body is made thinner, so that the inorganic plate main body can be made thinner accordingly. Accordingly, in addition to the effect of the first aspect of the present invention, it is possible to ensure the ease of processing the inorganic plate main body.

According to the third aspect of the present invention, the high rigidity of the ceramic plate prevents the insulative inorganic plate from warping along the direction of the spring load applied to the conductive acicular body. There is no warping of the coil spring constituting the assembly along the direction of the spring load, and in addition to the effect of the second aspect of the invention, the holding and operation of the conductive needle-shaped body are stabilized, and the inspection accuracy is improved. Can also be secured.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a conductive contact as one embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of a conventional conductive contact.

[Explanation of symbols]

 1 Conductive Contact 2 Coil Spring 3 Conductive Needle 4 Conductive Needle 5 Needle Assy 6 Holder 7 Support Hole 11 Wiring Plate 13 Resin Plate 13a Through Hole 14 Ceramic Plate (Inorganic Plate Body) 14a Through Hole 15 Insulating inorganic plate A Inspection object B Circuit (inspection object) C Spark

Claims (3)

[Claims] 1. A conductive contact in which a conductive needle contacting an object to be inspected is removably received in a support hole provided in a holder made of an insulating resin material, wherein the holder has a surface facing the object to be inspected. A conductive contact formed by laminating an insulating inorganic plate provided with a through-hole for slidably penetrating the tip of the conductive needle-like body. 2. The conductive contact according to claim 1, wherein the insulative inorganic plate is formed by laminating an inorganic plate body as a surface to be inspected and a resin plate. Conductive contact. 3. The conductive contact according to claim 2, wherein the inorganic plate main body is a ceramic plate.