JPH0528525Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Purpose of the Invention] (Field of Industrial Application) The present invention relates to a spring probe used for electrical continuity testing of electronic components.

(Prior Art) As shown in FIG. 4, a plunger 12 is fitted inside a barrel 11 so as to be freely slidable in the axial direction, and the tip of the plunger 12 comes into contact with a printed wiring board or a lead of an electronic component. measurement terminal 13
is formed, and the opposite side of the barrel 11 is used as a terminal terminal 14, and this terminal terminal 14
A spring 15 fitted inside the barrel 12 elastically presses the inner end of the plunger 12, and a recess 16 formed on the circumferential surface of the barrel 11 locks the inner end of the plunger. That's what I do.

Then, the measurement terminal 13 is pressed against the object under test, and a test current is applied to the circuit under test to perform a continuity test.

(Problem to be solved by the invention) A spring probe with this type of structure has a load that can be applied to the tip of the measurement terminal 13 of 100
Limited to ~200 grams. Therefore, the strength of the test object cannot be tested during the continuity test.

Furthermore, the inside of the spring probe undergoes repeated sliding motion for each inspection, which causes wear between the contact parts. Abrasion powder generated from the sliding portion due to this wear deteriorates electrical continuity and increases the contact resistance value.

An object of the present invention is to enable conduction testing and strength testing of electronic components to be performed almost simultaneously with one spring probe. Furthermore, another object of the present invention is to enable the device to withstand use over a long period of time without abrasion powder generated on the sliding portions adhering to the conduction transmission contact surface.

[Structure of the idea]

(Means for Solving the Problems) According to the invention of claim 1, one plunger 23 is fitted inside a barrel 21 so as to be slidable in the axial direction, and a flange formed at an intermediate portion of this one plunger 23 is provided. The portion 24 is elastically pressed against the end locking portion 25 of the barrel 21 by a relatively strong spring 27 built into the barrel 21, and the barrel 2
A plunger 23 protruding from the tip of 1 serves as a measurement terminal 26, and the relatively strong spring 27
is supported by a rear end locking part 33 formed on the barrel 21 via an insulating material 31 fitted to the rear end of the barrel 21, and is fitted to the insulating material 31 from the rear end of the barrel 21. Terminal 35 is protruded,
A relatively weak spring 37 and the other plunger 38 elastically protruding toward the one plunger 23 side are fitted into the terminal 35, and both plungers 2
A gap 39 between the opposing end surfaces 23a and 38a of 3 and 38.
This is a spring probe with a

The invention of claim 2 is a spring probe in which, in addition to the structure of claim 1, an insulating pipe 28 is fitted from one plunger 23 to the other plunger 38.

(Function) In the present invention, the measurement terminal 26 of one plunger 23 is pressed against the test object against a relatively strong spring 27, and the measurement terminal 26 of one of the plungers 23 and 38 is pressed against the test object. A strength test is carried out by applying a relatively strong load from the spring 27 to the sample. Then, with one plunger 23 in contact with the other plunger 38 and electrical continuity between both plungers 23 and 38 reliably maintained by the relatively weak biasing force of the spring 37, electricity is applied to the test object. Conduct a continuity test.

Further, by providing the insulating pipe 28 that fits from one plunger 23 to the other plunger 38, abrasion powder may be generated due to the relatively strong spring 27 sliding on the inner wall surface of the barrel 21. Even if both plungers 23,3
The abrasion powder does not enter between the opposing end surfaces 23a and 38a of 8.

(Example) Hereinafter, the present invention will be explained in detail with reference to the example shown in FIGS. 1 to 3.

As shown in FIG. 1, one plunger 23 is inserted into the barrel 21 through the rear end opening 22.
is inserted, the flange portion 24 formed at the intermediate portion of the plunger 23 abuts the tip locking portion 25 formed at the tip portion of the barrel 21, and the measurement terminal located on the left side of the flange portion 24 of the plunger 23 is inserted. 26 projects outward from the opening at the tip of the barrel.

Then, a relatively strong spring 27 is inserted into the barrel through the rear end opening 22 of the barrel 21, the left end of this spring 27 is engaged with the flange portion 24, and an insulating pipe 28 made of Teflon resin is inserted into the plunger. 23 is fitted. The spring 27 is attached to the outer periphery of the right end of this pipe 28.
A spacer 29 corresponding to the right end is integrally provided.

Next, as shown in FIG.
An insulating material 31 and a stopper 32 are fitted into the rear part of the barrel from the rear end opening 22 of 1, and the relatively strong force of the spring 27 is applied to the spacer 29, the insulating material 31
The barrel 21 is locked via a stopper 32 by a rear end locking portion 33 formed in a concave shape on the circumferential surface of the barrel 21 . A terminal fitting groove 34 is provided in the axial center of the insulating material 31, and this fitting groove 34
The terminal 35 fitted into the barrel 21 protrudes from the rear end opening 22, and finally the rear end opening 22
A resin 36 is sealed in and a terminal 35 is fixed. A lead wire is connected to this terminal 35 via a socket.

The resin 36 is also filled between the stopper 32 and the terminal 35 as shown in FIG.
It maintains insulation between them.

Fitted inside the terminal 35 is a relatively weak spring 37 and the other plunger 38 which elastically projects toward the one plunger 23 by the spring 37. and,
Opposing end surfaces 23a of both plungers 23, 38,
A gap 39 is formed between 38a. The other plunger 38 is integrally molded with a large diameter portion 41 that is pressed by a spring 37 as shown in FIG.
It is locked by a portion 42 which is caulked to a small diameter at the open end.

The material of the barrel 21, the spacer 29 and the stopper 32 is brass, the material of the insulating material 31 is Bakelite or Juracon, and the material of the plungers 23, 38 is steel.

Next, the operation of this embodiment will be explained.

In a free state without sliding, there is no electrical continuity between the plunger 23 at the tip and the plunger 38 at the terminal 35.

One plunger 23 built into the barrel 21
and the other plunger 38 are elastically biased to the left by springs 27 and 37, respectively, and are slidable in the right axial direction, so that when the measurement terminal 26 is pressed against the test object, The external load compresses the spring 27 through the flange portion 24 formed at the intermediate portion of the plunger 23, and is supported by the recess 33 of the barrel 21 through the spacer 29, the insulating material 31, and the stopper 32. At the same time, when the gap 39 is narrowed by sliding of the plunger 23 and the opposing end surfaces 23a and 38a of both the plungers 23 and 38 come into contact, the spring 37 in the terminal is compressed and both the plungers 23 and 38 are brought into contact with each other.
38 slide together in the right axial direction, and electrical continuity is established between the measurement terminal 26 and the terminal 35.

At this time, the axial load applied to the terminal 35 is supported by the resin 36 sealed in the right end opening 22 of the barrel 21 and solidified.

The insulating pipe 28 made of Teflon-based resin is provided from one plunger 23 to the other plunger 38, and this pipe 28 prevents abrasion powder generated by sliding between the spring 27 and the inner wall of the barrel 21. etc., the opposing plunger 23,
38 is prevented from entering the gap 39 between the end surfaces 23a and 38a.

Then, the measurement terminal 26 is pressed against the test object such as a printed wiring board or the lead of an electronic component, and a relatively strong spring 27 is applied to the length of the gap 39 between one plunger 23 and the other plunger 38 The strength of the test object is tested using the force applied by the spring 37, and after both plungers 23 and 38 come into contact, sliding is repeated to ensure electrical continuity between the plungers 23 and 38 by the pressing force of the spring 37. After that, turn on the power and perform a continuity test.

According to experiments, the contact resistance value of a spring probe that does not use the insulating pipe 28 was measured after conducting continuity tests 300,000 times.
The contact resistance of the spring probe using the insulating pipe 28 was 700 mΩ, but the contact resistance value was 80~80 mΩ.
decreased to 100mΩ. This is the gap 3 of wear powder.
This is because the pipe 28 prevents the pipe from entering the pipe 9 .

In addition, as shown in FIG.
9. The insulating material 31 and the stopper 32 may be integrally molded with an insulating material.

[Effect of idea]

According to the present invention, two types of plungers that are elastically pressed by two types of springs are provided with a gap in between, so that strength tests and continuity tests on test objects such as electronic components can be performed almost simultaneously. ,
The number of measurements can be halved.

In addition, even if wear particles are generated on the internal sliding parts due to repeated use of this spring probe, the insulating pipe blocks the wear particles, preventing them from adhering to the contact end surfaces of both plungers. , low contact resistance can be maintained over a long period of time.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view showing an embodiment of the spring probe of the present invention, Fig. 2 is a partially enlarged cross-sectional view, Fig. 3 is a cross-sectional view showing a modified example of the present invention, and Fig. 4 is a conventional spring probe. FIG. 3 is a partially cutaway front view showing the spring probe of FIG. 21...barrel, 23...one plunger,
23a... End face, 24... Flange portion, 25...
Tip locking portion, 26... Measuring element, 27... Relatively strong spring, 28... Insulating pipe, 31...
...Insulating material, 33...Rear end locking part, 35...Terminal, 37...Relatively weak spring, 38...
The other plunger, 38a... end face, 39... gap.

Claims (1)

[Claims for Utility Model Registration] (1) A comparison in which one plunger is fitted inside the barrel so as to be able to slide freely in the axial direction, and a flange portion formed at the middle part of this one plunger is built into the barrel. A plunger that is elastically pressed against a locking portion at the tip of the barrel by a strong spring and protrudes from the tip of the barrel serves as a measuring terminal, and the relatively strong spring is fitted into the rear end of the barrel. The terminal is supported by a rear end locking part formed on the barrel through an insulating material, and a terminal fitted to the insulating material protrudes from the rear end of the barrel. A spring probe characterized in that the other plunger elastically protruding toward the one plunger side is fitted by a spring, and a gap is formed between opposing end surfaces of both plungers. (2) The spring probe according to claim 1, wherein an insulating pipe is fitted from one plunger to the other plunger.