JP4668406B2 - Conductive contact - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention provides a signal transmission line for transmitting an electrical signal taken out by bringing the protruding end of the needle-like body into contact with an inspection target (a liquid crystal display substrate, TAB, package substrate (PKG), etc.) to an external circuit. It is related with the conductive contact which has.
[0002]
[Prior art]
Conventionally, in a conductive contact used for a contact probe for conducting an electrical inspection of a printed wiring board conductor pattern or an electronic element, the conductive needle and the needle can be projected and retracted in the axial direction. The holder has a supporting holder and is elastically energized by a coil spring in a direction that causes the protruding end of the needle-like body to protrude from the front end (one axial end) of the holder, and inspects the protruding end of the needle-like body Some have been made to contact the subject elastically.
[0003]
As such, a conductive contact 100 as shown in FIG. 2 is known. This conductive contact 100 has a needle-like body assembly 5 in which a pair of conductive needle-like bodies 3 and 4 are coupled 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 pair of conductive needle-like bodies 3 and 4 is received while allowing reciprocating movement, and the pair of conductive needle-like bodies 3 and 4 protrudes outward and is attached so as not to be detached. ing.
[0004]
At this time, the holder 6 is composed of an intermediate resin insulator 8, and an upper resin insulator 9 and a lower resin insulator 10 that are laminated vertically so as to sandwich the intermediate resin insulator 8, and The pair of conductive needles 3 and 4 are formed with stepped barrels having different diameters. Then, the pair of conductive needles 3 and 4 are inserted into the support hole 7 in a state in which the respective step portions are fixed to the upper resin insulator 9 and the lower resin insulator 10 so as to be prevented from coming off. It is accepted.
[0005]
According to this 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 stacked on the holder 6 and electrically connected. The protruding end of the lower conductive needle-like body 4 is used by elastically contacting the inspection object A. Thereby, the presence or absence of a short circuit or disconnection of the circuit formed in the inspection object A can be inspected.
[0006]
[Problems to be solved by the invention]
By the way, in this conductive contact 100, when a defective circuit b having an abnormally high resistance value is formed in the circuit B to be inspected A, a spark C is generated from the defective circuit b portion at the time of inspection. However, due to the spark, the surface 10a of the lower resin insulator 10 that is the surface facing the inspection object A is carbonized and damaged, resulting in a decrease in durability.
[0007]
Accordingly, an object of the present invention is to provide a conductive contact having improved durability by preventing carbonization damage of the holder due to sparks generated from a defective circuit portion at the time of inspection.
[0008]
[Means for Solving the Problems]
In order to achieve the above-described object, according to the first aspect of the present invention, the conductive needle-like body that comes into contact with the object to be inspected is received in a support hole provided in a holder having a holder body made of an insulating resin material so as to be able to appear and retract. In the conductive contact, the holder is formed by laminating an insulating inorganic plate having a through-hole slidably penetrating the tip of the conductive needle-like body on the inspection target side of the holder body. The conductive contact is abutted against the inner surface of the insulating inorganic plate and is prevented from coming off, and the insulating inorganic plate is an inorganic plate main body and a resin plate as the inspection object facing surface. It is characterized by being laminated.
[0009]
For this reason, in invention of Claim 1, the spark at the time of a test | inspection can be interrupted | blocked by an insulating inorganic plate, and it can prevent reaching the insulating resin material formation part of a holder.
[0011]
Further , since the ease of cracking when the inorganic plate body is thinned can be reinforced with the resin plate, the inorganic plate body can be made thinner accordingly. Furthermore, processing such as drilling is facilitated by thinning the inorganic plate body.
[0012]
The invention according to claim 2 is the conductive contact according to claim 1 , wherein the inorganic plate body is a ceramic plate.
[0013]
For this reason, in the invention of claim 2 , due to the high rigidity of the ceramic plate, there is no warpage of the insulating inorganic plate along the spring load direction applied to the conductive needle-like body, thereby holding the conductive needle-like body. And stable operation.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
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.
[0015]
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 in parallel at a predetermined pitch in the vertical and horizontal directions.
[0016]
In this conductive contact 1, a pair of conductive needle bodies 3, 4 coupled to both ends of a coil spring 2 is connected to a support hole 7 provided in a holder 6 made of an insulator. The conductive needle-like bodies 3 and 4 are received while allowing reciprocating movement, and the conductive needle-like body 4 at one end protrudes outward and is attached so as not to be detached, and the other end side. The conductive needle-like body 3 is electrically connected to and attached to the electrode 12 fixed to the wiring plate 11 laminated on the holder 6.
[0017]
The needle-like body assembly 5 is assembled to the support hole 7 through the opening 9a on the side of the support hole 7 on the side where the wiring plate 11 is laminated.
[0018]
At this time, the holder 6 is provided with an insulating inorganic plate 15 having a through-hole that slidably penetrates the tip of the conductive needle-like body 4 on the opposite surface of the inspection object A on the opposite side of the wiring plate 11. It is configured by stacking.
[0019]
In the present embodiment, the insulating inorganic plate 15 is configured by laminating a ceramic plate (inorganic plate main body) 14 and a resin plate 13 as opposed surfaces of the inspection object A. The ceramic plate 14 and the resin plate 13 are integrated via an adhesive to constitute an insulating inorganic plate 15.
[0020]
Specifically, the holder 6 includes intermediate resin insulators 8a and 8b stacked in two layers, and an upper resin insulator 9 and an insulating film stacked vertically so as to sandwich the intermediate resin insulators 8a and 8b. The support hole 7 is formed by connecting the through holes formed in the thickness direction so that the centers of the insulators 8a, 8b, 9, 15 are aligned with each other. Configured. 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. It consists of a through hole. The through hole of the insulating inorganic plate 15 is configured by communicating the through hole 13a of the resin plate 13 with the through hole 14a of the ceramic plate 14 having the same diameter as the through hole 13a.
[0021]
Further, 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, as the fastening holes, screw insertion holes 18 are formed in the intermediate resin insulators 8a and 8b, 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, respectively. It has been drilled. The screw insertion holes 13b and 14b are 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 is smaller in diameter than the screw insertion hole 14b.
[0022]
The holder 6 inserts the fastening screw 16 from the screw insertion hole 14b with the screw portion 16b at the top, and also inserts the screw insertion holes 13b and 18 into the screw hole 9b. It is configured by screwing and fixing the laminated structure composed of the intermediate resin insulators 8a and 8b, the upper resin insulator 9, and the insulating inorganic plate 15 by bringing the end face of the head portion 16a into close contact with the resin plate 13. Yes. At this time, the fastening screw 16 is designed so that the head portion 16a is accommodated in the screw insertion hole 14b and the tip portion of the screw portion 16b does not protrude outward from the screw hole 9b.
[0023]
In addition, the conductive needle-like bodies 3 and 4 include body portions 3a and 4a formed with diameters that can move while being guided in the through holes of the opening 9a and the intermediate resin insulators 8a and 8b, and coil springs. The coupling bosses 3b and 4b projecting from the trunks 3a and 4a with a diameter capable of winding the coil ends of the two coils, and the coupling bosses 3b and 4b are projected to the opposite sides. It consists of needle portions 3c and 4c protruding from 4a. Among the needle portions 3c and 4c, the needle portion 4c, in particular, is formed with a small diameter that can move while being guided by the through hole of the insulating inorganic plate 15.
[0024]
Further, the needle-like body assembly 5 is configured by coupling the conductive needle-like bodies 3 and 4 by press-fitting the coupling boss portions 3b and 4b to both ends of the coil spring 2, respectively. In addition, the conductive needles 3 and 4 can be joined by brazing, soldering, or using an adhesive.
[0025]
The needle-like body assembly 5 is inserted into the support hole 7 starting from the needle portion 4c of the conductive needle-like body 4 from the opening 9a side of the support hole 7, thereby insulating the end surface of the body portion 4a. The needle 4c is received in the support hole 7 in a state where the needle part 4c protrudes outward from the insulating inorganic plate 15 through the through holes 13a and 14a. The In this receiving state, since the wiring plate 11 is not laminated, the conductive needle-like body 3 coupled to the other end of the coil spring 2 is not shown, but is not prevented from being removed. It protrudes outward from the opening 9a of the support hole 7 by the free length.
[0026]
Thus, by laminating the wiring plate 11 on the upper surface of the upper resin insulator 9, the conductive needles 3 protruding outward are returned into the support holes 7 (see FIG. 1). The needle part 3c is elastically contacted with the electrode 12, and electrical connection with the wiring plate 11 is achieved. The wiring plate 11 is laminated and fixed on the upper surface of the upper resin insulator 9 by fixing means (not shown).
[0027]
The conductive contact 1 configured as described above makes the needle part 4c of the conductive needle-like body 4 elastically contact the circuit B of the inspection target A to check whether the circuit B is short-circuited or disconnected. Can be inspected.
[0028]
When a defective circuit b having an abnormally high resistance value is formed in the circuit B to be inspected A, a spark C is generated from the defective circuit b portion at the time of inspection. The defective circuit b of the present embodiment is formed by short-circuiting the circuits B1 and B2 that should originally be formed independently.
[0029]
According to this conductive contact 1, the spark C at the time of inspection can be blocked by the ceramic plate 14 and can be prevented from reaching other insulating resin material forming portions of the holder 6, thereby causing the spark C. It is possible to effectively prevent carbonization damage and improve durability.
[0030]
Further, the insulating inorganic plate 15 is free from warping along the spring load direction of the coil spring 2 constituting the needle-like body assembly 5 due to the high rigidity of the ceramic plate 14. The operation is stable, and as a result, the inspection accuracy can be improved.
[0031]
Moreover, since the insulating inorganic plate 15 can reinforce the ease of cracking when the ceramic plate 14 is thinned by the resin plate 13, the ceramic plate 14 can be made thinner correspondingly, and thereby the through hole 14 a. And hole processing of the screw insertion hole 14b and the like are facilitated. 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. In this case, the resin plate 13 having a thickness of 1 mm is used. High strength.
[0032]
Further, since the insulating inorganic plate 15 is formed by integrating the ceramic plate 14 and the resin plate 13 using an adhesive, no screw countersunk processing is required for the integration, and the ceramic plate 14 and the resin plate 13 can be combined. The through holes 14a and 13a and the screw insertion holes 14b and 13b to be drilled may all be straight hole processing, and the ease of processing can be ensured also in this respect.
[0033]
Further, the integration of the ceramic plate 14 and the resin plate 13 can be performed either before or after drilling, and the protrusions formed on the resin plate 13 in place of the bonding means described above are formed on the ceramic plate 14. It can also be performed by press-fitting into the hole formed in the above.
[0034]
Furthermore, in this embodiment, the opening 9a of the support hole 7 can be opened by detaching the wiring plate 11 laminated on the holder 6, and the defective conductive needle-like shape can be opened through the opening 9a. The needle-like body assembly 5 provided with the body can be pulled out and removed, and the new needle-like body assembly 5 is inserted into the empty support hole 7 and the wiring plate 11 is laminated on the holder 6 to form the needle-like body. The assembly 5 can be exchanged. This replacement operation does not involve disassembly and reassembly of the holder 6 itself, and can be easily performed without requiring a high degree of skill.
[0035]
Further, in this embodiment, the inorganic plate body as the constituent element of the insulating inorganic plate 15 is configured by the ceramic plate 14, but the present invention is not limited to this, and for example, the inorganic plate body may be a ceramic plate, A glass plate can also be used.
[0036]
【The invention's effect】
As described above, according to the invention of claim 1, it is possible to effectively prevent the spark at the time of inspection from being blocked by the insulating inorganic plate and 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.
[0037]
Moreover, since the non-machine plate body cracking ease when the thin can be reinforced by a resin plate, it is possible to thin the correspondingly inorganic plate body, ease of processing of Lina machine plate body by the this Can also be secured.
[0038]
According to the second aspect of the invention, the high rigidity of the ceramic plate prevents the insulating inorganic plate from warping along the spring load direction applied to the conductive needle-like body, thereby forming the needle-like body assy. Therefore, in addition to the effect of the invention of claim 1 , the holding and operation of the conductive needle-like body are stabilized, and as a result, the inspection accuracy is also improved. can do.
[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]
DESCRIPTION OF SYMBOLS 1 Conductive contact 2 Coil spring 3 Conductive needle-like body 4 Conductive needle-like body 5 Needle-like body assembly 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 (2)

In the conductive contact that is received in a support hole provided in the holder having a holder body made of an insulating resin material, the conductive needle contacted with the object to be inspected,
The holder is configured by laminating an insulating inorganic plate having a through hole through which the tip of the conductive needle-like body is slidably penetrated on the inspection target side of the holder body ,
The conductive contact is abutted against the inner surface of the insulating inorganic plate and is prevented from coming off,
A conductive contact, wherein the insulating inorganic plate is configured by laminating an inorganic plate main body and a resin plate as an inspection target facing surface. The conductive contact according to claim 1,
The conductive contact is characterized in that the inorganic plate body is a ceramic plate.

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