JPH0486565A - Electroconductive contact - Google Patents

Abstract

PURPOSE:To enable the arranging of a plurality of contacts with intervals being narrowed therebetween by applying a coating of an insulation layer on an outer circumferential surface of a conductive needle-shaped body of the contacts. CONSTITUTION:Conductive contacts 1 each have a cylindrical receptacle 3 held on a support 2 and a wire-like conductive needle-shaped body 6 received in the receptacle 3 piercing it. Core of the needle-shaped body 6 employs a conductor 7 made of a tungsten wire. A coating of an insulating resin layer 8 is applied on an outer circumferential surface of the conductor 7 but none at the end rear of the needle-shaped body. As the conductor 7 is insulated from the receptacle 3 with a resin layer 8, any electrical signal which is taken out with the conductor 7 from a conductive pattern 5 on a printed wire board 4 is not transmitted to the receptacle 3. Thus, even when the receptacles 3 are kept in contact, no electrical signal leaks through the receptacles 3 thereby enabling the arranging of contacts 1 in plurality at a high density.

Description

[Detailed Description of the Invention] [Object of the Invention] <Industrial Application Field> The present invention relates to a conductive contactor used in a contact probe, and in particular, to a conductive contactor used in a contact probe, and in particular, to a conductive contactor used in a contact probe, and in particular to a conductive contactor used in a contact probe, and in particular to a conductive contactor used in a contact probe, and particularly to a conductive contactor used in a contact probe. The present invention relates to a conductive contact suitable for a contact probe for electrically testing.

<Prior art> Conventionally, conductive contacts used in contact probes for electrically testing conductor patterns on printed wiring boards, electronic devices, etc. have been constructed by inserting a conductive needle into a cylindrical glue receptacle. There is a device that is reciprocatably received and elastically biased in a direction in which the tip of the conductive needle-like body protrudes, and the above-mentioned inspection is performed by bringing the tip into contact with a conductive pattern or the like. Moreover, in an automatic tester, a plurality of conductive contacts are arranged in parallel so as to penetrate through an insulating support plate.

By the way, for printed wiring boards where the wiring density has increased in recent years, it is desirable to use one in which the distance between adjacent conductive contacts is narrowed as much as possible, and the outer diameter of the receptacle is also reduced. There is a need to. Some such small-diameter receptacles are made of nickel silver, which can be precisely machined and has fatigue resistance. However, if the distance between the conductive contacts is made as narrow as possible, there is a risk that adjacent receptacles will come into contact with each other and the electrical signals picked up by the conductive sword will leak. The problem is that you have to do it.

<Problems to be Solved by the Invention> In view of the problems of the prior art, the main purpose of the present invention is to provide a method for arranging adjacent conductive contacts with as narrow a distance as possible when using a plurality of conductive contacts. The object of the present invention is to provide a conductive contact that can be used.

[Structure of the Invention] <Means for Solving the Problems> According to the present invention, the present invention provides a conductive needle-like body for extracting an electrical signal by contacting an object to be inspected; This is achieved by providing a conductive contact having a cylindrical glue receptacle that receives the body so as to be able to reciprocate in the axial direction, the outer peripheral surface of the needle-like body being coated with an insulating layer. be done.

<Function> In this way, the conductive needle and the receptacle are electrically insulated from each other, so in automatic test equipment etc. that use multiple conductive contacts in parallel, metal Even when using conductive glue receptacles, there is no equal support for electrical signal transmission even if adjacent receptacles come into contact with each other, so it is not possible to arrange multiple conductive contacts closely together. can.

<Embodiments> Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows an embodiment of a conductive contact according to the invention. This contactor 1 includes a cylindrical glue receptacle 3 (for example, outer diameter 0.3 mm, length 18 mm) held in a penetrating state by a support 2 that is part of an automatic tester (not shown). , has a wire-like conductive needle-like body 6 which is received in the receptacle 3 in a penetrating state so as to be able to reciprocate in the axial direction and is brought into contact with an object to be inspected such as a conductive pattern 5 on the printed wiring board 4. . The core material of the needle-like body 6 includes
A conductor 7 made of a tungsten wire with an extremely small diameter (for example, 0.1 mm) is used, and an insulating resin layer 8 with a thickness of, for example, 5 μm is coated on the outer peripheral surface of the conductor 7, as clearly shown in FIG. It is coated with high quality. Note that the bottom tip of the hook-shaped body 6 protruding from the tip 3a of the receptacle 3 and the two rear ends of the figure that are connected to a control section to be described later are coated with a resinous layer 8 shown in [-]. Although not shown, gold is deposited on both ends of the conductor 7 with a nickel base to ensure good conductivity.

Further, a pipe-shaped guide member 9 made of, for example, nickel silver is fitted onto the outer periphery of the resin layer 8 near the tip of the needle-like body 6 and fixed with adhesive. The needle-like body 6 is guided coaxially with the needle-like body 6, and the linearity of the tip of the needle-like body 6 is maintained. Further, the hook-shaped body 6 is coated with a resin layer 8 and extends outward from the opening on the upper rear end 3b side of the receptacle 3 in FIG. electrically connected to the control unit that is not connected.

A locking portion 11 is formed in the intermediate portion of the receptacle 3 by caulking, for example, so as to protrude radially inward over the entire circumference, and engages with the upper shoulder portion of the guide member 9 in the receptacle 3 in the figure. A compression coil spring 12 which is wound with play around the outer periphery of the resin layer 8 of the needle body 6 is connected to the stop part 11.
is interposed. Locking portion 1 of compression coil spring 12] A large diameter portion 12a whose diameter is slightly larger than the inner diameter of receptacle 3 is formed at the end of the side pond, as clearly shown in FIG. Therefore, when assembling the conductive contact 1,
As shown in FIG. 3, the needle-like body 6 with the compression coil spring 12 wound thereon is inserted into the receptacle 3 from the opening on the lower end side as shown by the arrow in the figure. 11 until the coil end of the large-diameter portion 12a comes into contact with the needle-shaped body 6, and the large-diameter portion 12a is fitted with its elastic force outward in the radial direction against the oriented circumferential surface 3c. Together, the upper end of the helical compression spring 12 is fixed within the receptacle 3.

On the outer periphery of the resin layer 8 in the upper part in the figure from the locking part 11 of the needle-like body 6, there is a coil-like body 13 made of a coil spring.
It is wound to a predetermined length so as to extend near the rear end 3b of the receptacle 3 over the entire stroke L (for example, 3 mm) of the needle-like body 6. This coiled body 13 has a loosely wound portion 13a in the middle portion, and densely wound portions 13b in the portions extending from the loosely wound portion 13a to both ends, and the adhesive poured into the loosely wound portion 13a. 14, it is fixed to the needle-like body 6. Note that since the tightly wound portions 13b are provided at both ends of the loosely wound portion 13a, it is possible to suitably prevent the adhesive 14 from flowing out from the loosely wound portion 13a when the adhesive 14 is poured.

In addition, a sheet-like fusing material is wound around a predetermined position of the needle-like body 6 in advance, and after the coil-like body 13 is wound so that the loosely wound portion 13a corresponds to the part of the fusing material, it is fused by heating. It is also possible to melt the adhesive material and adhere it instead of the adhesive 14 described above.

In this way, the length of the coiled body 13 on the rear end 3b side of the receptacle 3 is longer than the full stroke L of the needle-like body 6 (
For example, 12 mm) is wound around the needle-like body 6, thereby preventing concentration of bending stress on the rear end 3b of the receptacle 3 of the needle-like body 6 due to reciprocating movement during inspection. In addition, when moving in and out of the receptacle 3, the rear end 3
It is possible to prevent the resin layer 8 of the needle-like body 6 from directly rubbing against the needle-like body 6 and protect that part, and since it is coil-shaped, flexibility is not impaired.

FIG. 1 shows a standby state of the conductive contact 1 in which the needle-like body 6 is not in contact with the conductive pattern 5 to be inspected, and as described above, the inner circumferential surface 3 of the receptacle 3
The large diameter portion 12a of the compression coil spring 12 is elastically fitted into the spring 12, thereby fixing the large diameter portion 12a within the receptacle 3. The coil end of the tightly wound portion 13b on the lower side of the figure of the coiled body 13 comes into contact with the large diameter portion 12a, and in this state, the compression coil spring 12 is compressed by a predetermined amount and assembled. The sword-like body 6 is urged in the protruding direction with a predetermined elastic force, and the needle-like body 6 is stopped downward in the figure against the elastic force.

FIG. 4 shows a state in which the support 2 is lowered relative to the printed wiring board 4 and the protruding end of the conductor 7 at the tip of the needle-like body 6 is brought into contact with the conductive pattern 5. There is. As shown in the figure, the compression coil spring 12 is compressed and the needle-shaped body 6 comes into contact with the conductive pattern 5 with an appropriate spring force, thereby ensuring electrical contact between the two. Note that since only one conductor 7 provides electrical continuity between the conductive pattern 5 and the control section (not shown), signals can be stably transmitted with low internal resistance.

In the conductive contact 1 constructed in this way, when repairing the needle-like body 6, etc., the tip of the needle-like body 6 is removed by the compression coil 1.
The receptacle 3 can be easily removed leaving the receptacle 3 intact by pulling it downward using the force on the elastically fitted inner side of the large diameter portion 12a of the second receptacle. Therefore, the needle-shaped body 6 and the like can be replaced while the receptacle 3, which requires relatively high assembly accuracy, remains attached to the support plate, and maintenance can be performed conveniently.

As described above, since the conductor 7 and the receptacle 3 are insulated by the resin layer 8, the electric signal extracted from the conductor pattern 5 is not transmitted to the receptacle 3. Therefore, in an automatic tester in which a plurality of conductive contacts 1 are arranged, even if the conductive contacts 1 are arranged in close contact with each other, that is, even if the receptacles 3 are brought into contact with each other, Electric signals do not leak through the receptacle 3.

Therefore, since a plurality of conductive contacts 1 can be arranged at a high density, it is possible to easily perform multi-point simultaneous measurements on the inspected objects such as printed wiring boards, which have become denser in recent years.

Further, although an insulating resin plate or a ceramic plate is generally used for the support plate 2, a metal plate can be used according to the present invention. The supporting precision of the conductive contact 1 can be suitably improved. Furthermore, if the resin layer 8 is coated with, for example, a fluororesin, the sliding resistance between the needle-shaped body 6 and the compression coil spring 12 is small, and smooth movement of the needle-shaped body 6 can be ensured. Since there is no rubbing against each other, generation of metal powder can be prevented.

[Effects of the Invention] As described above, according to the present invention, even if adjacent receptacles contact each other when a plurality of conductive contacts are arranged in parallel, the electrical signals taken out by the conductive needles will not be transmitted. It is suitable for simultaneous multi-point measurement on high-density printed wiring boards because it does not cause transmission problems and the distance between conductive contacts can be minimized, meaning they can be placed in contact with each other. can be done. Further, a metal plate can be used as the support plate of the receptacle, and the receptacle can be arranged with high precision, which has extremely great effects.

[Brief explanation of the drawing]

FIG. 1 shows a conductive contact according to the invention. FIG. 2 is an enlarged sectional view taken along the line ■-■ in FIG. 1. FIG. 3 is an enlarged view of the main parts showing the state before the compression coil spring 12 is assembled into the receptacle 3. FIG. 4 is a diagram corresponding to FIG. 1 showing a state in which the conductive contact is brought into contact with the object to be inspected. DESCRIPTION OF SYMBOLS 1...Contactor 2...Support plate 3...Receptacle 3a...Tip 3b...Rear end 4...Printed wiring board 6...Needle body 8...Resin layer 11 ...Locking part 12a...Large diameter part 13a...Loosely wound part 14...Adhesive

Claims (1)

[Claims] (1) It has a conductive needle-like body that is brought into contact with an object to be inspected and extracts an electrical signal, and a cylindrical receptacle that receives the needle-like body so as to be able to reciprocate in the axial direction, and the needle-like body A conductive contact characterized by having an insulating layer coated on the outer circumferential surface of the body.