CN218445658U - High stability four-wire test probe - Google Patents

Abstract

The utility model relates to a high stability four-wire test probe, which comprises an outer tube, wherein a crown spring, a first needle shaft, a spring and a second needle shaft are axially arranged in the outer tube, the high stability four-wire test probe also comprises an inner tube arranged in the outer tube, the first needle shaft and the spring are arranged in the inner tube, one end of the second needle shaft extends out of the outer tube, the crown spring is contacted with the inner wall of the outer tube, and the inner wall of the outer tube is also provided with an insulating sleeve component isolated from the inner tube and the second needle shaft; during the test, insert in the crown spring and contact with first needle shaft with the pin, at this moment, alright loop through crown spring and outer tube and draw forth a test line, and another test line is then drawn forth by first needle shaft, spring, inner tube and second needle shaft in proper order, in addition, keeps the part except crown spring to be insulating with the outer tube through insulating cover subassembly, prevents that two test lines from interfering mutually and leading to the test failure.

Description

High stability four-wire test probe

Technical Field

The utility model relates to a test probe technical field, in particular to high stability four-wire test probe.

Background

The test probe is a high-end precision link device, is widely applied to testing PCB circuit boards and 10FPC (printed circuit), is mainly used as a precision probe for connection, and is widely applied to the technical fields of mobile phones, automobiles, medical treatment, aerospace, aviation and the like at present. When the test probe is used, the test probe is arranged on the test fixture, one end of the test probe is connected with the output end (the output end refers to voltage, frequency and the like), the other end of the test probe is connected with the tested element so as to carry out testing, and the requirement on the test probe in the testing process is extremely high. Spring probes typically include a needle shaft, a needle cannula, and a spring. The spring is arranged in the needle tube, and the needle shaft is inserted in the needle tube. When the needle shaft is extruded by the component, the compression spring moves axially, the outer surface of the needle shaft is in contact with the inner surface of the needle tube, and current is transmitted to the needle tube from the needle shaft and then is connected with external test equipment.

The current probe can't be used for the four-wire test, when carrying out the four-wire test to electronic equipment's pin, because need detect the axial impedance parameter of pin, consequently need draw forth the signal of two different test points on the pin through the probe, furthermore, because the quantity of pin is many and arrange closely, traditional probe can lead to can't carrying out the drawing of many test circuit with other pin contact on next door, consequently, how to design a spring probe, be convenient for carry out the four-wire test to electronic equipment's pin, the key problem that the skilled person in the art needs to solve urgently.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to prior art not enough, provide a high stability four-wire test probe, this high stability four-wire test probe can solve above-mentioned problem well.

In order to meet the above requirements the utility model provides a technical scheme that its technical problem adopted is:

the utility model provides a high stability four-wire test probe, includes the outer tube, the axial is equipped with crown spring, first needle axle, spring and second needle axle in proper order in the outer tube, still including locating inner tube in the outer tube, first needle axle with the spring is located in the inner tube, the one end of second needle axle is stretched out the outer tube, crown spring with the inner wall contact of outer tube, still be equipped with on the inner wall of outer tube with the inner tube with the isolated insulating cover subassembly of second needle axle.

High stability four-wire test probe, wherein, the crown spring is fixed in the tip of outer tube.

High stability four-wire test probe, wherein, first needle axle is close to be equipped with the contact groove on the one end terminal surface of crown spring.

High stability four-wire test probe, wherein, when the assembly targets in place, first needle axle with the second needle axle all with the spring supports tightly.

High stability four-wire test probe, wherein, when the assembly targets in place, the second needle axle inserts the inner tube and with the spring supports tightly.

High stability four-wire test probe, wherein, the second needle axle with the inner wall in close contact with of inner tube.

High stability four-wire test probe, wherein, the epaxial being close to of second needle the one end lateral wall of inner tube is gone up to cave in and is equipped with the ring channel, the ring channel be equipped with second needle axle location is in annular cutting ferrule in the outer tube.

High stability four-wire test probe, wherein, the external diameter of annular cutting ferrule is greater than the external diameter of second needle axle.

High stability four-wire test probe, wherein, insulating cover subassembly includes first insulation bush and second insulation bush, first insulation bush is located the inner tube with between the outer tube, second insulation bush is located the second needle axle with between the outer tube.

High stability four-wire test probe, wherein, insulating cover subassembly still includes third insulating bush, third insulating bush is located the inner tube with between the hat spring, when the assembly targets in place, second insulating bush first insulating bush with third insulating bush and the hat spring supports tightly in proper order.

The beneficial effects of the utility model reside in that: during the test, insert the probe on the pin for the pin gets into in the hat spring and contacts with first needle axle, at this moment, alright loop through hat spring and outer tube and draw forth a test line, and another test line is then drawn forth by first needle axle, spring, inner tube and second needle axle in proper order, and then alright carry out the four-wire test, and whole process is quick, and is high-efficient and stable, and in addition, keeps apart from hat the spring part and outer tube insulation through insulating cover subassembly, prevents that two test lines from interfering mutually and leading to the test failure.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the present invention will be further described below with reference to the accompanying drawings and embodiments, wherein the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained without inventive work according to the drawings:

fig. 1 is the internal structure schematic diagram of the high stability four-wire test probe of the present invention.

Fig. 2 is an enlarged view of a portion of a structure at a in fig. 1.

Detailed Description

The terms "first," "second," "third," and "fourth," etc. in the description and claims of the invention and in the accompanying drawings are used for distinguishing between different elements and not for describing a particular sequential order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the invention. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein may be combined with other embodiments.

"plurality" means two or more. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.

Also, the terms "upper, lower, left, right, upper, lower, longitudinal" and the like, which denote orientation, are used with reference to the attitude and position of the device or apparatus in the present disclosure during normal use.

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, a clear and complete description will be given below with reference to the technical solutions of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

The utility model discloses high stability four-wire test probe of preferred embodiment, as shown in fig. 1-2, this test probe includes outer tube 1, the axial is equipped with crown spring 2, first needle axle 3, spring 4 and second needle axle 5 in the outer tube 1 in proper order, when the assembly targets in place, the both ends of spring 4 offset with first needle axle 3 and second needle axle 5, spring 4 is in compression state, this test probe is still including locating the inner tube 6 in the outer tube 1, first needle axle 3 and spring 4 locate in the inner tube 6, one end of second needle axle 5 stretches out the outer tube 1, crown spring 2 contacts with the inner wall of outer tube 1, still be equipped with the insulating cover subassembly 7 isolated with inner tube 6 and second needle axle 5 on the inner wall of outer tube 1; during the test, insert the probe on pin 100, make pin 100 get into crown spring 2 in and contact with first needle axle 3, at this moment, alright loop through crown spring 2 and outer tube 1 and draw forth a test circuit, and another test circuit is then drawn forth by first needle axle 3 in proper order, spring 4, inner tube 6 and second needle axle 5, and then alright carry out the four-wire test, draw forth the test circuit of two intercommunications in two differences on pin 100, whole process can be accomplished fast, the efficiency of software testing is high, and when switching the test position, two test circuits can not influence each other all the time, high stability, in addition, keep the part except crown spring 2 insulating with outer tube 1 through insulating cover subassembly 7, prevent that two test circuits from interfering mutually and leading to the test failure.

Preferably, the crown spring 2 is fixed at the end of the outer tube 1, specifically, a narrowing portion 1a for preventing the crown spring 2 from falling off is arranged on the inner wall of one end of the outer tube 1 adjacent to the crown spring 2, and the crown spring 2 is tightly abutted against the narrowing portion 1a, so that the crown spring 2 is effectively prevented from shaking and falling off in the process.

Preferably, a contact groove 31 is formed on an end surface of the first needle shaft 3 near the crown spring 2 to ensure stability of contact.

Preferably, when the assembly targets in place, first needle axle 3 and second needle axle 5 all support tightly with spring 4 to guarantee the stability of contact, when the assembly targets in place, second needle axle 5 inserts inner tube 6 and supports tightly with spring 4, and further, second needle axle 5 avoids appearing contact failure's condition with the inner wall in close contact with of inner tube 6.

Preferably, the sunken ring channel 8 that is equipped with on the one end lateral wall that is close to inner tube 6 on the second needle axle 5, ring channel 8 are equipped with the annular cutting ferrule 9 of 5 cards of second needle axle in outer tube 1, and is specific, and annular cutting ferrule 9 is the metal material, and the external diameter of annular cutting ferrule 9 is greater than the external diameter of second needle axle 5 to support tightly with the insulating sleeve subassembly in the outer tube 1, avoid second needle axle 5 to drop, when the assembly targets in place, annular cutting ferrule 9 offsets with the tip of inner tube 6.

Preferably, the insulation sleeve assembly 7 includes a first insulation sleeve 71 and a second insulation sleeve 72, the first insulation sleeve 71 is located between the inner tube 6 and the outer tube 1, the second insulation sleeve 72 is located between the second needle shaft 5 and the outer tube 1, wherein the diameter of the second needle shaft 5 is smaller than the inner diameter of the second insulation sleeve 72, and a fixing sleeve 10 is provided between the second insulation sleeve and the second insulation sleeve, the second insulation sleeve 5 is sleeved on the second needle shaft 5, further, the insulation sleeve assembly 7 further includes a third insulation sleeve 73, the third insulation sleeve 73 is located between the inner tube 6 and the crown spring 2, specifically, the first insulation sleeve 71, the second insulation sleeve 72, the third insulation sleeve 73, and the crown spring 73 are all cylindrical, and when assembled in place, the second insulation sleeve 72, the first insulation sleeve 71, the third insulation sleeve 73, and the crown spring 2 are sequentially abutted, so as to achieve insulation and also ensure the assembling tightness between the crown spring 2 and the inner tube 6.

It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are considered to be within the scope of the invention as defined by the following claims.

Claims (10)

1. The utility model provides a high stability four-wire test probe, its characterized in that, includes the outer tube, the axial is equipped with crown spring, first needle axle, spring and second needle axle in proper order in the outer tube, still including locating inner tube in the outer tube, first needle axle with the spring is located in the inner tube, the one end of second needle axle is stretched out the outer tube, crown spring with the inner wall contact of outer tube, still be equipped with on the inner wall of outer tube with the inner tube with the isolated insulating cover subassembly of second needle axle.

2. The high stability four wire test probe of claim 1, wherein the crown spring is secured to an end of the outer tube.

3. The high stability four wire test probe of claim 1, wherein the first needle shaft has a contact groove on an end surface thereof adjacent to the crown spring.

4. The high stability four wire test probe of claim 1, wherein the first needle shaft and the second needle shaft each abut the spring when assembled in place.

5. The high stability four wire test probe of claim 4, wherein the second needle shaft is inserted into the inner tube and urged against the spring when assembled in place.

6. The high stability four wire test probe of claim 5, wherein the second needle shaft is in intimate contact with an inner wall of the inner tube.

7. The high stability four wire test probe of claim 5, wherein the second needle shaft has an annular groove recessed into a side wall of an end of the second needle shaft adjacent the inner tube, the annular groove having an annular collar that positions the second needle shaft within the outer tube.

8. The high stability four wire test probe of claim 7, wherein an outer diameter of the annular ferrule is greater than an outer diameter of the second needle shaft.

9. The high stability four wire test probe of any one of claims 1-7, wherein the insulating sleeve assembly includes a first insulating bushing and a second insulating bushing, the first insulating bushing being positioned between the inner tube and the outer tube, the second insulating bushing being positioned between the second needle shaft and the outer tube.

10. The high stability four wire test probe of claim 9, wherein the insulation sleeve assembly further comprises a third insulation bushing positioned between the inner tube and the crown spring, the second, first and third insulation bushings, and the crown spring abutting in sequence when assembled in place.

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