JPH09152447A - Two end mobile type coaxial contact probe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To build a contact probe in a coaxial structure and moreover, allow a plunger and an outer plunger to move at both ends thereof. SOLUTION: In this contact probe, a cylindrical insulating member 18 is fitted securely into the outer circumference of the contact probe 10 with plungers 14 movable at both ends thereof and moreover, a first outer tube 20 comprising an electroconductive material is fitted securely into the outer circumference thereof. Then, a large-diameter part 20a is provided on the outer circumference at the central part in the axial direction of the first outer tube 20 and a second outer tube 22 comprising an electroconductive material is inserted to be fitted into the outer circumference thereof. The second outer tube 22 is fixed on the first outer tube 20 at the central part in the axial direction of the contact probe and a cylindrical clearance is formed between the outer tubes 20 and 22 at both end parts in the axial direction of the contact probe. A coil spring 24 and a cylindrical outer plunger 26 comprising an electroconductive material is inserted into each clearance and moreover, locked so as not to be slipped off.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is interposed between two circuit boards arranged substantially parallel to each other, electrically connecting the two circuit boards by a coaxial line, and used for a circuit inspection or the like. The present invention relates to a coaxial contact probe with movable ends.

[0002]

2. Description of the Related Art With the recent miniaturization of electronic communication devices and the like, circuits built in these devices have a structure in which a plurality of circuit boards each having a small area are arranged substantially in parallel in a housing. The boards tend to be electrically connected by coaxial lines. If the signal processed by the circuit is a high-frequency signal, the connection by the coaxial line is necessary to prevent unnecessary radiation of signal radio waves and to prevent the introduction of external noise. Then, in the inspection of the circuit board, a contact probe is interposed between the circuit boards arranged substantially in parallel, and the circuit boards are temporarily electrically connected to each other to inspect the circuit configuration of the device. And adjustments are made.

As a conventional contact probe which is interposed between circuit boards for temporary electrical connection, for example, there is a coaxial type probe as proposed in Japanese Utility Model Publication No. 6-45258. In the coaxial probe disclosed in Japanese Utility Model Publication No. 6-45258, a contact probe having a coaxial line structure is formed on one end side, but the other end side is not coaxial, and thus a center conductor of the coaxial line is formed. Only the facing plunger is movably formed.

[0004]

In the above-mentioned conventional contact probe, the coaxial line is not formed on both end sides of the contact probe, and the high frequency signal is inserted between the circuit boards for inspection or the like. When it is used as a transmission line, there is a problem that unnecessary radiation of signal radio waves occurs in a portion other than the coaxial line. In the finally assembled circuit, the circuit board is not connected by the coaxial line at the inspection stage even though the circuit board is electrically connected by the coaxial line with appropriate impedance. The inspection and adjustment based on the electrical characteristics under the condition cannot be performed.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a double-end movable coaxial contact probe which constitutes a coaxial line and has a plunger movable at both ends.

[0006]

In order to achieve such an object, the both-end movable coaxial contact probe of the present invention comprises:
A cylindrical insulating member is fitted and fixed on the outer circumference of the contact probe in which the plunger is movable at both ends, and a first outer tube made of a conductive material is fitted and fixed on the outer circumference of the insulating member. A second outer tube made of a conductive material is fitted on the outer circumference of the outer tube, and the second outer tube is fixed to the first outer tube at the central portion in the axial direction, and the first and the first outer tubes are fixed at both ends in the axial direction. Cylindrical gaps are provided between the two outer tubes, and cylindrical outer plungers made of a conductive material are arranged in the gaps so as to be movable in the axial direction and not to come out. And a coil spring for elastically urging the outer plunger in the direction of exiting the outer plunger.

Then, a cylindrical insulating member is fitted and fixed to the outer periphery of the contact probe having a plunger movable at both ends, an outer tube made of a conductive material is fitted and inserted into the outer periphery of the insulating member, and the central portion in the axial direction is fitted. The outer tube is fixed to the insulating member, and cylindrical gaps are provided between the insulating member and the outer tube at both ends in the axial direction, and a cylindrical outer plunger made of a conductive material is provided in the gap. The coil springs may be arranged so as to be movable in any direction so as not to slip out, and a coil spring that elastically biases the outer plunger in a direction to slip out of the outer plunger may be arranged in the gap.

Further, a cylindrical insulating member is fitted and fixed on the outer circumference of the contact probe having a plunger movable at both ends, and an outer tube made of a conductive material is fitted and fixed on the outer circumference of the insulating member. A large-diameter portion is provided in the central portion in the axial direction, and a cylindrical outer plunger made of a conductive material and having an outer diameter smaller than the large-diameter portion is axially movable so as not to come out. Alternatively, the coil springs may be contracted between the large diameter portion and the outer plunger.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG. FIG. 1 is a vertical cross-sectional view of a first embodiment of a both-end movable coaxial contact probe of the present invention.

In FIG. 1, a contact probe 10 provided at an axial center is provided in both ends of a tube 12 made of a conductive material so that the plungers 14 and 14 are movable in the axial direction and do not come out. The coil spring 16 is contracted between the two plungers 14, 14 in the tube 12 so that the plungers 14, 14 are movable at both ends. As an example, the plungers 14, 14 have a small diameter portion formed on the outer periphery of the intermediate portion in the axial direction, and the tube 12 is appropriately squeezed to face the small diameter portion to form a narrowing portion. , 14 are prevented from coming off.

A cylindrical insulating member 18 is fitted and fixed to the outer periphery of the contact probe 10. This fitting and fixing may be performed by any means such as press fitting. Further, the first outer tube 20 made of a conductive material is fitted and fixed to the outer periphery of the insulating member 18. The fixing of the first outer tube 20 is achieved by, for example, squeezing at both ends. Further, a large diameter portion 20a is formed on the outer periphery of the central portion in the axial direction of the first outer tube 20. Further, a second outer tube 22 made of a conductive material is fitted to the outer periphery of the large-diameter portion 20a of the first outer tube 20 and is appropriately fixed by punching or the like, so that the second outer tube 22 is 1 outer tube 2
It is fixed to 0 at the central part in the axial direction. Moreover, at both axial ends, between the first and second outer tubes 20, 22,
Cylindrical gaps are formed in each. In these gaps,
Coil springs 24, 24 are inserted into each of them, and a cylindrical outer plunger 26 made of a conductive material,
26 are inserted into each. Outer plunger 2
Nos. 6 and 26 have a small-diameter portion formed on the outer periphery on the protruding side, and face the small-diameter portion on the outer periphery in a state of being inserted into the gap, and both ends of the second outer tube 22 are squeezed to form a compressed portion. It is formed and is prevented from coming off. Here, the coil springs 24, 24 are contracted between the outer plungers 26, 26 and the stepped portion of the large diameter portion 20a.
6, 26 are elastically urged in the protruding direction by an appropriate force.
Further, the tips of the outer plungers 26, 26 and the plungers 14, 14 of the contact probe 10 are set to be substantially at the same position in the maximum allowable protruding state.

In the both-end-movable coaxial contact probe of the first embodiment having such a structure, the contact probe 1
Plungers 14 and 14 at both ends of the tube
Are electrically connected by. In addition, the outer plungers 26, 26 include the first and second outer tubes 2
It is electrically connected by 0 and 22. Moreover, the first and second outer tubes 20 and 22 are fitted into the contact probe 10 via the insulating member 18, and a coaxial line is formed between both ends. Moreover, the distance between the tube 12 of the contact probe 10 and the first outer tube 20 is substantially constant, and the coaxial line has a substantially constant impedance between both ends.

Therefore, the plungers 14, 14 of the contact probe 10 are respectively attached to the lands on the circuit board which are interposed between the two circuit boards arranged substantially in parallel and are connected to the central conductor of the coaxial line. The outer plungers 26, 26 are respectively brought into contact with the ground on the circuit board connected to the outer conductor of the coaxial line provided around the land so that the two circuit boards are coaxial. Electrically connected by.

Further, another embodiment of the both-end movable coaxial contact probe of the present invention will be described. FIG. 2 (a)
Is a second of the both-end movable coaxial contact probe of the present invention.
It is a longitudinal section of an example. FIG. 2 (b) is a longitudinal sectional view of a third embodiment of the both-end movable coaxial contact probe of the present invention. FIG. 3 (c) is a vertical cross-sectional view of a fourth embodiment of the both-end movable coaxial contact probe of the present invention. FIG.
(D) is a longitudinal sectional view of a fifth embodiment of the movable coaxial contact probe of the present invention. FIG. 4 (e) is a vertical cross-sectional view of a sixth embodiment of the both-end movable coaxial contact probe of the present invention. FIG. 4 (f) is a vertical cross-sectional view of a seventh embodiment of the both-end movable coaxial contact probe of the present invention. 2 to 4, members that are the same as or equivalent to those in FIG. 1 are denoted by the same reference numerals, and redundant description will be omitted.

First, the second embodiment shown in FIG. 2 (a) is different from the first embodiment shown in FIG. 1 in that the large diameter portion 20a is not provided in the first outer tube 20, A small diameter portion 22a is provided on the inner circumference of the outer tube 22 at the central portion in the axial direction, and the second outer tube 22 is fixed to the first outer tube 20 at the central portion in the axial direction by the small diameter portion 22a. . The coil springs 24, 24 are connected to the outer plungers 26, 26.
And the second outer tube 22 is contracted between the steps of the small diameter portion 22a on the inner periphery of the second outer tube 22.

The second embodiment is a coaxial contact probe having a coaxial line structure and having the same performance as that of the first embodiment, in which both ends are movable, but the first and second outer tubes 2 are provided.
Both 0 and 22 can be manufactured from a thin metal cylinder by drawing or the like. Further, the first outer tube 20 may be replaced with a metal cylinder and a conductive metal thin film may be provided on the outer periphery of the insulating member 18. The second outer tube 22
Needless to say, it may be manufactured by cutting from a thick metal tube. In the case of such cutting, the second
It goes without saying that the outer circumference of the outer tube 22 does not have to have a small diameter in the central portion in the axial direction.

Next, the third embodiment shown in FIG. 2B is different from the first embodiment shown in FIG. 1 in that a large diameter portion is formed on the inner circumference of the outer plungers 26, 26 on the protruding side. Both ends of the first outer tube 20 are
The outer plungers 26, 26 are enlarged and formed so as to face the inner peripheral large-diameter portions, and the outer plungers 26, 26 are prevented from coming off. Therefore, it is not necessary that both ends of the second outer tube 22 are squeezed to form the pinched portion.

The fourth embodiment shown in FIG. 3 (c) differs greatly from the first embodiment shown in FIG. 1 in that
The first outer tube 20 is omitted. Therefore, the second outer tube 22 is directly fitted to the outer periphery of the insulating member 18. A small diameter portion 22a is provided on the inner circumference of the central portion of the second outer tube 22 in the axial direction, and the second outer tube 2 is formed by the small diameter portion 22a.
2 is fixed to the insulating member 18 at the central portion in the axial direction, and cylindrical gaps are respectively formed between the insulating member 18 and the second outer tube 22 at both end portions in the axial direction. Then, the coil springs 24, 24 and the outer plungers 26, 26 are inserted into these gaps,
Both ends of the second outer tube 22 are squeezed to prevent the outer plungers 26, 26 from coming off.

In the movable contact type coaxial contact probe of the fourth embodiment having such a structure, the entire probe has a smaller diameter than those of the first to third embodiments because the first outer tube 20 is omitted. It is suitable for manufacturing. It is needless to say that the second outer tube 22 acts as an outer conductor and has a coaxial line structure as in the first to third embodiments.

The fifth embodiment shown in FIG. 3 (d) is different from the fourth embodiment shown in FIG. 3 (c) in that a large diameter portion 18a is provided on the outer periphery of the central portion of the insulating member 18 in the axial direction. The large-diameter portion 18a is provided to fix the second outer tube 22 to the insulating member 18 at the central portion in the axial direction, and the cylindrical member is provided between the insulating member 18 and the second outer tube 22 at both axial ends. A gap is formed in each. The coil springs 24, 24 have a large diameter portion 1 on the outer circumference of the outer plungers 26, 26 and the insulating member 18.
It is contracted between the step 8a and the step.

In the fifth embodiment, the second outer tube 22 can be easily manufactured with a thin metal tube, and the drawing process and the like are less than those in the fourth embodiment.

Further, the sixth embodiment shown in FIG. 4 (e) is greatly different from the first embodiment shown in FIG. 1 in that the second outer tube 22 is omitted. Therefore, a large diameter portion 20a is provided on the outer periphery of the central portion of the first outer tube 20 in the axial direction, and small diameter portions 20b, 20 are formed on the outer periphery of the ends of the first outer tube slightly from the center to the outer periphery.
b is provided. The first outer tube 20 is fixed to the insulating member 18 at both ends of the large diameter portion 20a. Then, the coil springs 24, 24 and the outer plungers 26, 26 are fitted and inserted into both axial end portions of the first outer tube 20, and the outer plungers 26, 26 are punched by facing the small diameter portions 20b, 20b. As a result, a compressed portion is formed, and the removal from the first outer tube 20 is prevented. The coil springs 24, 24 are compressed between the outer plungers 26, 26 and the step between the large diameter portion 20a. The outer diameters of the coil springs 24, 24 and the outer plungers 26, 26 are smaller than those of the large diameter portion 20a. Due to the outer circumference of the large diameter portion 20a,
It is fixed to the probe holding plate.

The sixth embodiment is suitable for manufacturing the entire probe with a smaller diameter than that of the first to third embodiments because the second outer tube 22 is omitted.

Further, the seventh embodiment shown in FIG. 4 (f) differs from the sixth embodiment shown in FIG. 4 (e) in that the outer diameters of the outer plungers 26, 26 on the protruding side are large. Is formed, and the first outer tube 20 is formed.
Both ends of the outer plunger 26 are enlarged and formed so as to face the large diameter portion of the inner circumference of the outer plunger 26, 26.
It is because the escape of 6, 26 is prevented. The small diameter portions 20b, 20b in the seventh embodiment are not provided.

In the seventh embodiment, the first outer tube 20 can be manufactured from a thin metal cylinder by drawing or the like.

In the first to seventh embodiments, the contact probe 10, the insulating member 18, and the first and second outer tubes 20 and 22 are fixed by any means such as press fitting, drawing, crimping, punching, or bonding. May be done in any way. Further, the mechanism for preventing the outer plungers 26, 26 from coming off may have any structure, and is not limited to the above embodiment. The contact probe 10 is not limited to the structure described in FIG. 1 as long as the plungers 14 and 14 can move at both ends.

[0027]

As is apparent from the above description, the both end movable coaxial contact probe of the present invention has the following special effects.

In the both-end movable coaxial contact probe according to the first aspect, the plunger and the outer plunger which come into contact with the lands respectively connected to the core conductor and the outer conductor of the coaxial line are movable at both ends. Then
Moreover, the first and second outer tubes are fitted around the contact probe to form a coaxial line structure. Therefore, for inspection and adjustment, if the two high-frequency circuit boards arranged substantially in parallel are connected using the coaxial movable contact probe of the present invention, both circuit boards are electrically connected by coaxial lines. Once connected, they can be inspected, adjusted, etc. under the same electrical characteristics as the final assembled state.

In the both-end movable coaxial contact probe according to the second aspect, the coaxial line structure is formed as in the first aspect, but the first outer tube according to the first aspect. This is suitable for manufacturing the entire probe with a smaller diameter by omitting the member corresponding to.

In addition, in the both-end movable coaxial contact probe according to claim 3, as in the case of claim 2, only the part corresponding to the second outer tube of claim 1 is omitted. It is suitable for manufacturing the entire probe with a smaller diameter.

[Brief description of the drawings]

FIG. 1 is a vertical cross-sectional view of a first embodiment of a both-end movable coaxial contact probe of the present invention.

FIG. 2A is a longitudinal sectional view of a second embodiment of a coaxial contact probe with movable ends, according to the present invention. (B) is a longitudinal sectional view of a third embodiment of the movable coaxial contact probe of the present invention.

FIG. 3 (c) is a vertical cross-sectional view of a fourth embodiment of the both-end movable coaxial contact probe of the present invention. (D) is a longitudinal sectional view of a fifth embodiment of the movable coaxial contact probe of the present invention.

FIG. 4 (e) is a longitudinal sectional view of a sixth embodiment of the both-end movable coaxial contact probe of the present invention. (F) is a longitudinal sectional view of a seventh embodiment of the both-end movable coaxial contact probe of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Contact probe 18 Insulating member 18a Large diameter part 20 First outer tube 20a Large diameter part 20b Small diameter part 22 Second outer tube 22a Small diameter part 24 Coil spring 26 Outer plunger

Claims (3)

[Claims] 1. A tubular insulating member is fitted and fixed on the outer circumference of a contact probe having a plunger movable at both ends, and a first outer tube made of a conductive material is fitted and fixed on the outer circumference of the insulating member. Further, a second outer tube made of a conductive material is fitted and inserted around the outer periphery of the first outer tube, and the second outer tube is fixed to the first outer tube at the central portion in the axial direction and at both end portions in the axial direction. Cylindrical gaps are provided between the first and second outer tubes, respectively, and cylindrical outer plungers made of a conductive material are axially movable in the gaps and arranged so as not to come out. And a coil spring for elastically urging the outer plunger in the direction of exiting the outer plunger is arranged in each of the gaps. Axial contact probe. 2. A cylindrical insulating member is fitted and fixed to the outer circumference of a contact probe having a plunger movable at both ends, and an outer tube made of a conductive material is fitted and inserted into the outer circumference of the insulating member, and at the central portion in the axial direction. The outer tube is fixed to the insulating member, and cylindrical gaps are provided between the insulating member and the outer tube at both ends in the axial direction, and a cylindrical outer plunger made of a conductive material is provided in the gap. Both ends are movable so as to be movable in any direction and arranged so that they do not come out, and coil springs that elastically bias the outer plunger in the direction so as to come out of the outer plunger are arranged. Shaped coaxial contact probe. 3. A cylindrical insulating member is fitted and fixed on the outer circumference of a contact probe having a plunger movable at both ends, and an outer tube made of a conductive material is fitted and fixed on the outer circumference of this insulating member. A large-diameter portion is provided in the central portion in the axial direction, and a cylindrical outer plunger made of a conductive material and having an outer diameter smaller than the large-diameter portion is axially movable so as not to come out. A both-end movable coaxial contact probe, characterized in that the coil springs are fitted to each other, and coil springs are respectively contracted between the large diameter portion and the outer plunger.